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1 de6d9b64 Fabrice Bellard
/*
2 983e3246 Michael Niedermayer
 * MPEG1 codec / MPEG2 decoder
3 ff4ec49e Fabrice Bellard
 * Copyright (c) 2000,2001 Fabrice Bellard.
4 de6d9b64 Fabrice Bellard
 *
5 ff4ec49e Fabrice Bellard
 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
7
 * License as published by the Free Software Foundation; either
8
 * version 2 of the License, or (at your option) any later version.
9 de6d9b64 Fabrice Bellard
 *
10 ff4ec49e Fabrice Bellard
 * This library is distributed in the hope that it will be useful,
11 de6d9b64 Fabrice Bellard
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 ff4ec49e Fabrice Bellard
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
14 de6d9b64 Fabrice Bellard
 *
15 ff4ec49e Fabrice Bellard
 * You should have received a copy of the GNU Lesser General Public
16
 * License along with this library; if not, write to the Free Software
17
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18 de6d9b64 Fabrice Bellard
 */
19 983e3246 Michael Niedermayer
 
20
/**
21
 * @file mpeg12.c
22 029911d1 Michael Niedermayer
 * MPEG1/2 codec
23 983e3246 Michael Niedermayer
 */
24
 
25 a74127c0 Fabrice Bellard
//#define DEBUG
26 de6d9b64 Fabrice Bellard
#include "avcodec.h"
27
#include "dsputil.h"
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#include "mpegvideo.h"
29
30
#include "mpeg12data.h"
31
32 bb198e19 Michael Niedermayer
//#undef NDEBUG
33
//#include <assert.h>
34
35 d87c0267 Michael Niedermayer
36 de6d9b64 Fabrice Bellard
/* Start codes. */
37
#define SEQ_END_CODE                0x000001b7
38
#define SEQ_START_CODE                0x000001b3
39
#define GOP_START_CODE                0x000001b8
40
#define PICTURE_START_CODE        0x00000100
41
#define SLICE_MIN_START_CODE        0x00000101
42
#define SLICE_MAX_START_CODE        0x000001af
43
#define EXT_START_CODE                0x000001b5
44
#define USER_START_CODE                0x000001b2
45
46 4f68b084 Michael Niedermayer
#define DC_VLC_BITS 9
47
#define MV_VLC_BITS 9
48
#define MBINCR_VLC_BITS 9
49
#define MB_PAT_VLC_BITS 9
50
#define MB_PTYPE_VLC_BITS 6
51
#define MB_BTYPE_VLC_BITS 6
52
#define TEX_VLC_BITS 9
53
54 764ef400 Mike Melanson
#ifdef CONFIG_ENCODERS
55 de6d9b64 Fabrice Bellard
static void mpeg1_encode_block(MpegEncContext *s, 
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                         DCTELEM *block, 
57
                         int component);
58 63b15e55 Michael Niedermayer
static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added
59 764ef400 Mike Melanson
#endif //CONFIG_ENCODERS
60 de6d9b64 Fabrice Bellard
static void mpeg1_skip_picture(MpegEncContext *s, int pict_num);
61 a0201736 Michael Niedermayer
static inline int mpeg1_decode_block_inter(MpegEncContext *s, 
62
                              DCTELEM *block, 
63
                              int n);
64
static inline int mpeg1_decode_block_intra(MpegEncContext *s, 
65 de6d9b64 Fabrice Bellard
                              DCTELEM *block, 
66
                              int n);
67 3729c912 Michael Niedermayer
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, 
68 de6d9b64 Fabrice Bellard
                                        DCTELEM *block, 
69
                                        int n);
70 3729c912 Michael Niedermayer
static inline int mpeg2_decode_block_intra(MpegEncContext *s, 
71 de6d9b64 Fabrice Bellard
                                    DCTELEM *block, 
72
                                    int n);
73
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
74 57489bc5 Ivan Kalvachev
static void exchange_uv(MpegEncContext *s);
75 de6d9b64 Fabrice Bellard
76 2e7b4c84 Ivan Kalvachev
#ifdef HAVE_XVMC
77
extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
78
extern int XVMC_field_end(MpegEncContext *s);
79 a579db0c Ivan Kalvachev
extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
80 57489bc5 Ivan Kalvachev
extern void XVMC_init_block(MpegEncContext *s);//set s->block
81 2e7b4c84 Ivan Kalvachev
#endif
82
83 c442d75c Michael Niedermayer
#ifdef CONFIG_ENCODERS
84 30952237 Michael Niedermayer
static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
85 0c1a9eda Zdenek Kabelac
static uint8_t fcode_tab[MAX_MV*2+1];
86 11ce8834 Michael Niedermayer
87 c442d75c Michael Niedermayer
static uint32_t uni_mpeg1_ac_vlc_bits[64*64*2];
88
static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
89 2a250222 Michael Niedermayer
90
/* simple include everything table for dc, first byte is bits number next 3 are code*/
91
static uint32_t mpeg1_lum_dc_uni[512];
92
static uint32_t mpeg1_chr_dc_uni[512];
93
94
static uint8_t mpeg1_index_run[2][64];
95
static int8_t mpeg1_max_level[2][64];
96 764ef400 Mike Melanson
#endif //CONFIG_ENCODERS
97 c442d75c Michael Niedermayer
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static void init_2d_vlc_rl(RLTable *rl)
99
{
100 07787186 Dominik Mierzejewski
    int i;
101 4f68b084 Michael Niedermayer
    
102
    init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2, 
103
             &rl->table_vlc[0][1], 4, 2,
104
             &rl->table_vlc[0][0], 4, 2);
105
106
    
107
    rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
108
    for(i=0; i<rl->vlc.table_size; i++){
109
        int code= rl->vlc.table[i][0];
110
        int len = rl->vlc.table[i][1];
111
        int level, run;
112
    
113
        if(len==0){ // illegal code
114
            run= 65;
115
            level= MAX_LEVEL;
116
        }else if(len<0){ //more bits needed
117
            run= 0;
118
            level= code;
119
        }else{
120
            if(code==rl->n){ //esc
121
                run= 65;
122
                level= 0;
123
            }else if(code==rl->n+1){ //eob
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                run= 0;
125
                level= 127;
126 4f68b084 Michael Niedermayer
            }else{
127
                run=   rl->table_run  [code] + 1;
128
                level= rl->table_level[code];
129
            }
130
        }
131
        rl->rl_vlc[0][i].len= len;
132
        rl->rl_vlc[0][i].level= level;
133
        rl->rl_vlc[0][i].run= run;
134
    }
135
}
136
137 2a250222 Michael Niedermayer
#ifdef CONFIG_ENCODERS
138 c442d75c Michael Niedermayer
static void init_uni_ac_vlc(RLTable *rl, uint32_t *uni_ac_vlc_bits, uint8_t *uni_ac_vlc_len){
139
    int i;
140
141
    for(i=0; i<128; i++){
142
        int level= i-64;
143
        int run;
144
        for(run=0; run<64; run++){
145
            int len, bits, code;
146
            
147
            int alevel= ABS(level);
148
            int sign= (level>>31)&1;
149
150
            if (alevel > rl->max_level[0][run])
151
                code= 111; /*rl->n*/
152
            else
153
                code= rl->index_run[0][run] + alevel - 1;
154
155
            if (code < 111 /* rl->n */) {
156
                    /* store the vlc & sign at once */
157
                len=   mpeg1_vlc[code][1]+1;
158
                bits= (mpeg1_vlc[code][0]<<1) + sign;
159
            } else {
160
                len=  mpeg1_vlc[111/*rl->n*/][1]+6;
161
                bits= mpeg1_vlc[111/*rl->n*/][0]<<6;
162
163
                bits|= run;
164
                if (alevel < 128) {
165
                    bits<<=8; len+=8;
166
                    bits|= level & 0xff;
167
                } else {
168
                    bits<<=16; len+=16;
169
                    bits|= level & 0xff;
170
                    if (level < 0) {
171
                        bits|= 0x8001 + level + 255;
172
                    } else {
173
                        bits|= level & 0xffff;
174
                    }
175
                }
176
            }
177
178
            uni_ac_vlc_bits[UNI_AC_ENC_INDEX(run, i)]= bits;
179
            uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
180
        }
181
    }
182
}
183 4f68b084 Michael Niedermayer
184 de6d9b64 Fabrice Bellard
static void put_header(MpegEncContext *s, int header)
185
{
186
    align_put_bits(&s->pb);
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    put_bits(&s->pb, 16, header>>16);
188
    put_bits(&s->pb, 16, header&0xFFFF);
189 de6d9b64 Fabrice Bellard
}
190
191
/* put sequence header if needed */
192
static void mpeg1_encode_sequence_header(MpegEncContext *s)
193
{
194
        unsigned int vbv_buffer_size;
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        unsigned int fps, v;
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        int n, i;
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        uint64_t time_code;
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        float best_aspect_error= 1E10;
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        float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
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        int constraint_parameter_flag;
201 426b8061 Michael Niedermayer
        
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        if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
203 de6d9b64 Fabrice Bellard
        
204 1e491e29 Michael Niedermayer
        if (s->current_picture.key_frame) {
205 de6d9b64 Fabrice Bellard
            /* mpeg1 header repeated every gop */
206
            put_header(s, SEQ_START_CODE);
207
            
208
            /* search closest frame rate */
209
            {
210
                int i, dmin, d;
211
                s->frame_rate_index = 0;
212
                dmin = 0x7fffffff;
213 14bea432 Michael Niedermayer
                for(i=1;i<14;i++) {
214
                    if(s->avctx->strict_std_compliance >= 0 && i>=9) break;
215
                     
216
                    d = abs(MPEG1_FRAME_RATE_BASE*(int64_t)s->avctx->frame_rate/s->avctx->frame_rate_base - frame_rate_tab[i]);
217 de6d9b64 Fabrice Bellard
                    if (d < dmin) {
218
                        dmin = d;
219
                        s->frame_rate_index = i;
220
                    }
221
                }
222
            }
223
 
224
            put_bits(&s->pb, 12, s->width);
225
            put_bits(&s->pb, 12, s->height);
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227
            for(i=1; i<15; i++){
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                float error= aspect_ratio;
229
                if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
230 f259747b Michael Niedermayer
                    error-= 1.0/mpeg1_aspect[i];
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                else
232
                    error-= av_q2d(mpeg2_aspect[i])*s->height/s->width;
233
             
234 426b8061 Michael Niedermayer
                error= ABS(error);
235
                
236
                if(error < best_aspect_error){
237
                    best_aspect_error= error;
238
                    s->aspect_ratio_info= i;
239
                }
240
            }
241
            
242
            put_bits(&s->pb, 4, s->aspect_ratio_info);
243 de6d9b64 Fabrice Bellard
            put_bits(&s->pb, 4, s->frame_rate_index);
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245
            if(s->avctx->rc_max_rate){
246
                v = (s->avctx->rc_max_rate + 399) / 400;
247
                if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
248
                    v = 0x3ffff;
249
            }else{
250
                v= 0x3FFFF;
251
            }
252 ecfd40b3 Henry Mason
253
            if(s->avctx->rc_buffer_size)
254
                vbv_buffer_size = s->avctx->rc_buffer_size;
255
            else
256
                /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
257 12dccd4e Michael Niedermayer
                vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
258
            vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
259
260
            put_bits(&s->pb, 18, v & 0x3FFFF);
261
            put_bits(&s->pb, 1, 1); /* marker */
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            put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF);
263
264
            constraint_parameter_flag= 
265
                s->width <= 768 && s->height <= 576 && 
266
                s->mb_width * s->mb_height <= 396 &&
267
                s->mb_width * s->mb_height * frame_rate_tab[s->frame_rate_index] <= MPEG1_FRAME_RATE_BASE*396*25 &&
268
                frame_rate_tab[s->frame_rate_index] <= MPEG1_FRAME_RATE_BASE*30 &&
269
                vbv_buffer_size <= 20 &&
270
                v <= 1856000/400 &&
271
                s->codec_id == CODEC_ID_MPEG1VIDEO;
272
                
273
            put_bits(&s->pb, 1, constraint_parameter_flag);
274 d6eb3c50 Michael Niedermayer
            
275
            ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
276
            ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
277 de6d9b64 Fabrice Bellard
278 029911d1 Michael Niedermayer
            if(s->codec_id == CODEC_ID_MPEG2VIDEO){
279
                put_header(s, EXT_START_CODE);
280
                put_bits(&s->pb, 4, 1); //seq ext
281
                put_bits(&s->pb, 1, 0); //esc
282
                put_bits(&s->pb, 3, 4); //profile
283
                put_bits(&s->pb, 4, 8); //level
284 3ab5b8cc Fabrice Bellard
                put_bits(&s->pb, 1, s->progressive_sequence);
285 029911d1 Michael Niedermayer
                put_bits(&s->pb, 2, 1); //chroma format 4:2:0
286
                put_bits(&s->pb, 2, 0); //horizontal size ext
287
                put_bits(&s->pb, 2, 0); //vertical size ext
288
                put_bits(&s->pb, 12, v>>18); //bitrate ext
289
                put_bits(&s->pb, 1, 1); //marker
290
                put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
291
                put_bits(&s->pb, 1, s->low_delay);
292
                put_bits(&s->pb, 2, 0); // frame_rate_ext_n
293
                put_bits(&s->pb, 5, 0); // frame_rate_ext_d
294
            }
295
            
296 de6d9b64 Fabrice Bellard
            put_header(s, GOP_START_CODE);
297
            put_bits(&s->pb, 1, 0); /* do drop frame */
298
            /* time code : we must convert from the real frame rate to a
299
               fake mpeg frame rate in case of low frame rate */
300
            fps = frame_rate_tab[s->frame_rate_index];
301 14bea432 Michael Niedermayer
            time_code = (int64_t)s->fake_picture_number * MPEG1_FRAME_RATE_BASE;
302 de6d9b64 Fabrice Bellard
            s->gop_picture_number = s->fake_picture_number;
303 0c1a9eda Zdenek Kabelac
            put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
304
            put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
305 de6d9b64 Fabrice Bellard
            put_bits(&s->pb, 1, 1);
306 0c1a9eda Zdenek Kabelac
            put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
307 14bea432 Michael Niedermayer
            put_bits(&s->pb, 6, (uint32_t)((time_code % fps) / MPEG1_FRAME_RATE_BASE));
308 69b0ff3a Michael Niedermayer
            put_bits(&s->pb, 1, 0); /* closed gop */
309 de6d9b64 Fabrice Bellard
            put_bits(&s->pb, 1, 0); /* broken link */
310
        }
311
312 14bea432 Michael Niedermayer
        if (s->avctx->frame_rate < (24 * s->avctx->frame_rate_base) && s->picture_number > 0) {
313 de6d9b64 Fabrice Bellard
            /* insert empty P pictures to slow down to the desired
314
               frame rate. Each fake pictures takes about 20 bytes */
315
            fps = frame_rate_tab[s->frame_rate_index];
316 14bea432 Michael Niedermayer
            n = av_rescale((int64_t)s->picture_number * s->avctx->frame_rate_base, fps, s->avctx->frame_rate) / MPEG1_FRAME_RATE_BASE - 1;
317 de6d9b64 Fabrice Bellard
            while (s->fake_picture_number < n) {
318
                mpeg1_skip_picture(s, s->fake_picture_number - 
319
                                   s->gop_picture_number); 
320
                s->fake_picture_number++;
321
            }
322
323
        }
324
}
325
326 9b8709d1 Michael Niedermayer
static inline void encode_mb_skip_run(MpegEncContext *s, int run){
327
    while (run >= 33) {
328
        put_bits(&s->pb, 11, 0x008);
329
        run -= 33;
330
    }
331
    put_bits(&s->pb, mbAddrIncrTable[run][1], 
332
             mbAddrIncrTable[run][0]);
333
}
334 de6d9b64 Fabrice Bellard
335
/* insert a fake P picture */
336
static void mpeg1_skip_picture(MpegEncContext *s, int pict_num)
337
{
338 029911d1 Michael Niedermayer
    assert(s->codec_id == CODEC_ID_MPEG1VIDEO); // mpeg2 can do these repeat things
339
340 de6d9b64 Fabrice Bellard
    /* mpeg1 picture header */
341
    put_header(s, PICTURE_START_CODE);
342
    /* temporal reference */
343
    put_bits(&s->pb, 10, pict_num & 0x3ff); 
344
    
345
    put_bits(&s->pb, 3, P_TYPE);
346
    put_bits(&s->pb, 16, 0xffff); /* non constant bit rate */
347
    
348
    put_bits(&s->pb, 1, 1); /* integer coordinates */
349
    put_bits(&s->pb, 3, 1); /* forward_f_code */
350
    
351
    put_bits(&s->pb, 1, 0); /* extra bit picture */
352
    
353
    /* only one slice */
354
    put_header(s, SLICE_MIN_START_CODE);
355
    put_bits(&s->pb, 5, 1); /* quantizer scale */
356
    put_bits(&s->pb, 1, 0); /* slice extra information */
357
    
358 9b8709d1 Michael Niedermayer
    encode_mb_skip_run(s, 0);
359 de6d9b64 Fabrice Bellard
    
360
    /* empty macroblock */
361
    put_bits(&s->pb, 3, 1); /* motion only */
362
    
363
    /* zero motion x & y */
364
    put_bits(&s->pb, 1, 1); 
365
    put_bits(&s->pb, 1, 1); 
366
367
    /* output a number of empty slice */
368 9b8709d1 Michael Niedermayer
    encode_mb_skip_run(s, s->mb_width * s->mb_height - 2);
369 de6d9b64 Fabrice Bellard
    
370
    /* empty macroblock */
371
    put_bits(&s->pb, 3, 1); /* motion only */
372
    
373
    /* zero motion x & y */
374
    put_bits(&s->pb, 1, 1); 
375
    put_bits(&s->pb, 1, 1); 
376
}
377 764ef400 Mike Melanson
#endif //CONFIG_ENCODERS
378 de6d9b64 Fabrice Bellard
379 8f8402e4 Michael Niedermayer
static void common_init(MpegEncContext *s)
380 de6d9b64 Fabrice Bellard
{
381 8f8402e4 Michael Niedermayer
    s->y_dc_scale_table=
382
    s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
383
}
384 f004ca1c Michael Niedermayer
385 2a250222 Michael Niedermayer
void ff_mpeg1_clean_buffers(MpegEncContext *s){
386
    s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
387
    s->last_dc[1] = s->last_dc[0];
388
    s->last_dc[2] = s->last_dc[0];
389
    memset(s->last_mv, 0, sizeof(s->last_mv));
390
}
391
392 7604246d Wolfgang Hesseler
#ifdef CONFIG_ENCODERS
393 9b8709d1 Michael Niedermayer
394
void ff_mpeg1_encode_slice_header(MpegEncContext *s){
395
    put_header(s, SLICE_MIN_START_CODE + s->mb_y);
396
    put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
397
    put_bits(&s->pb, 1, 0); /* slice extra information */
398
}
399
400 8f8402e4 Michael Niedermayer
void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
401
{
402 de6d9b64 Fabrice Bellard
    mpeg1_encode_sequence_header(s);
403
404
    /* mpeg1 picture header */
405
    put_header(s, PICTURE_START_CODE);
406
    /* temporal reference */
407 63b15e55 Michael Niedermayer
408
    // RAL: s->picture_number instead of s->fake_picture_number
409
    put_bits(&s->pb, 10, (s->picture_number - 
410 de6d9b64 Fabrice Bellard
                          s->gop_picture_number) & 0x3ff); 
411 af469427 Juanjo
    s->fake_picture_number++;
412 de6d9b64 Fabrice Bellard
    
413
    put_bits(&s->pb, 3, s->pict_type);
414 d60a8f85 Michael Niedermayer
415
    s->vbv_delay_ptr= s->pb.buf + get_bit_count(&s->pb)/8;
416
    put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
417 de6d9b64 Fabrice Bellard
    
418 63b15e55 Michael Niedermayer
    // RAL: Forward f_code also needed for B frames
419
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
420 de6d9b64 Fabrice Bellard
        put_bits(&s->pb, 1, 0); /* half pel coordinates */
421 cb231c48 Michael Niedermayer
        if(s->codec_id == CODEC_ID_MPEG1VIDEO)
422
            put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
423
        else
424
            put_bits(&s->pb, 3, 7); /* forward_f_code */
425 de6d9b64 Fabrice Bellard
    }
426
    
427 63b15e55 Michael Niedermayer
    // RAL: Backward f_code necessary for B frames
428
    if (s->pict_type == B_TYPE) {
429
        put_bits(&s->pb, 1, 0); /* half pel coordinates */
430 cb231c48 Michael Niedermayer
        if(s->codec_id == CODEC_ID_MPEG1VIDEO)
431
            put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
432
        else
433
            put_bits(&s->pb, 3, 7); /* backward_f_code */
434 029911d1 Michael Niedermayer
    }
435 63b15e55 Michael Niedermayer
436 de6d9b64 Fabrice Bellard
    put_bits(&s->pb, 1, 0); /* extra bit picture */
437 3ab5b8cc Fabrice Bellard
438
    s->frame_pred_frame_dct = 1;
439 029911d1 Michael Niedermayer
    if(s->codec_id == CODEC_ID_MPEG2VIDEO){
440
        put_header(s, EXT_START_CODE);
441
        put_bits(&s->pb, 4, 8); //pic ext
442 cb231c48 Michael Niedermayer
        if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
443
            put_bits(&s->pb, 4, s->f_code);
444
            put_bits(&s->pb, 4, s->f_code);
445
        }else{
446
            put_bits(&s->pb, 8, 255);
447
        }
448
        if (s->pict_type == B_TYPE) {
449
            put_bits(&s->pb, 4, s->b_code);
450
            put_bits(&s->pb, 4, s->b_code);
451
        }else{
452
            put_bits(&s->pb, 8, 255);
453
        }
454 029911d1 Michael Niedermayer
        put_bits(&s->pb, 2, s->intra_dc_precision);
455
        put_bits(&s->pb, 2, s->picture_structure= PICT_FRAME);
456 7a0f9d7e Fabrice Bellard
        if (s->progressive_sequence) {
457
            put_bits(&s->pb, 1, 0); /* no repeat */
458
        } else {
459
            put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
460
        }
461 3ab5b8cc Fabrice Bellard
        /* XXX: optimize the generation of this flag with entropy
462
           measures */
463
        s->frame_pred_frame_dct = s->progressive_sequence;
464
        
465
        put_bits(&s->pb, 1, s->frame_pred_frame_dct);
466 029911d1 Michael Niedermayer
        put_bits(&s->pb, 1, s->concealment_motion_vectors);
467
        put_bits(&s->pb, 1, s->q_scale_type);
468
        put_bits(&s->pb, 1, s->intra_vlc_format);
469
        put_bits(&s->pb, 1, s->alternate_scan);
470
        put_bits(&s->pb, 1, s->repeat_first_field);
471
        put_bits(&s->pb, 1, s->chroma_420_type=1);
472 3ab5b8cc Fabrice Bellard
        s->progressive_frame = s->progressive_sequence;
473
        put_bits(&s->pb, 1, s->progressive_frame);
474 029911d1 Michael Niedermayer
        put_bits(&s->pb, 1, 0); //composite_display_flag
475
    }
476
    
477 9b8709d1 Michael Niedermayer
    s->mb_y=0;
478
    ff_mpeg1_encode_slice_header(s);
479 de6d9b64 Fabrice Bellard
}
480
481 3ab5b8cc Fabrice Bellard
static inline void put_mb_modes(MpegEncContext *s, int n, int bits, 
482 bb198e19 Michael Niedermayer
                                int has_mv, int field_motion)
483 3ab5b8cc Fabrice Bellard
{
484
    put_bits(&s->pb, n, bits);
485
    if (!s->frame_pred_frame_dct) {
486
        if (has_mv) 
487 bb198e19 Michael Niedermayer
            put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
488 3ab5b8cc Fabrice Bellard
        put_bits(&s->pb, 1, s->interlaced_dct);
489
    }
490
}
491
492 de6d9b64 Fabrice Bellard
void mpeg1_encode_mb(MpegEncContext *s,
493
                     DCTELEM block[6][64],
494
                     int motion_x, int motion_y)
495
{
496 9b8709d1 Michael Niedermayer
    int i, cbp;
497
    const int mb_x = s->mb_x;
498
    const int mb_y = s->mb_y;
499
    const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
500 de6d9b64 Fabrice Bellard
501
    /* compute cbp */
502
    cbp = 0;
503
    for(i=0;i<6;i++) {
504
        if (s->block_last_index[i] >= 0)
505
            cbp |= 1 << (5 - i);
506
    }
507 bb198e19 Michael Niedermayer
    
508 029911d1 Michael Niedermayer
    if (cbp == 0 && !first_mb && (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) && 
509 bb198e19 Michael Niedermayer
        ((s->pict_type == P_TYPE && s->mv_type == MV_TYPE_16X16 && (motion_x | motion_y) == 0) ||
510 63b15e55 Michael Niedermayer
        (s->pict_type == B_TYPE && s->mv_dir == s->last_mv_dir && (((s->mv_dir & MV_DIR_FORWARD) ? ((s->mv[0][0][0] - s->last_mv[0][0][0])|(s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
511
        ((s->mv_dir & MV_DIR_BACKWARD) ? ((s->mv[1][0][0] - s->last_mv[1][0][0])|(s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
512 9b8709d1 Michael Niedermayer
        s->mb_skip_run++;
513 d87c0267 Michael Niedermayer
        s->qscale -= s->dquant;
514 49733979 Michael Niedermayer
        s->skip_count++;
515
        s->misc_bits++;
516
        s->last_bits++;
517 bb198e19 Michael Niedermayer
        if(s->pict_type == P_TYPE){
518
            s->last_mv[0][1][0]= s->last_mv[0][0][0]= 
519
            s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
520
        }
521 de6d9b64 Fabrice Bellard
    } else {
522 9b8709d1 Michael Niedermayer
        if(first_mb){
523
            assert(s->mb_skip_run == 0);
524
            encode_mb_skip_run(s, s->mb_x);
525
        }else{
526
            encode_mb_skip_run(s, s->mb_skip_run);
527 de6d9b64 Fabrice Bellard
        }
528
        
529
        if (s->pict_type == I_TYPE) {
530 d87c0267 Michael Niedermayer
            if(s->dquant && cbp){
531 bb198e19 Michael Niedermayer
                put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
532 d87c0267 Michael Niedermayer
                put_bits(&s->pb, 5, s->qscale);
533
            }else{
534 bb198e19 Michael Niedermayer
                put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
535 d87c0267 Michael Niedermayer
                s->qscale -= s->dquant;
536
            }
537 49733979 Michael Niedermayer
            s->misc_bits+= get_bits_diff(s);
538
            s->i_count++;
539 63b15e55 Michael Niedermayer
        } else if (s->mb_intra) {
540
            if(s->dquant && cbp){
541 bb198e19 Michael Niedermayer
                put_mb_modes(s, 6, 0x01, 0, 0);
542 63b15e55 Michael Niedermayer
                put_bits(&s->pb, 5, s->qscale);
543
            }else{
544 bb198e19 Michael Niedermayer
                put_mb_modes(s, 5, 0x03, 0, 0);
545 63b15e55 Michael Niedermayer
                s->qscale -= s->dquant;
546
            }
547
            s->misc_bits+= get_bits_diff(s);
548
            s->i_count++;
549 bb198e19 Michael Niedermayer
            memset(s->last_mv, 0, sizeof(s->last_mv));
550 63b15e55 Michael Niedermayer
        } else if (s->pict_type == P_TYPE) { 
551 bb198e19 Michael Niedermayer
            if(s->mv_type == MV_TYPE_16X16){
552 de6d9b64 Fabrice Bellard
                if (cbp != 0) {
553 bb198e19 Michael Niedermayer
                    if ((motion_x|motion_y) == 0) {
554 d87c0267 Michael Niedermayer
                        if(s->dquant){
555 bb198e19 Michael Niedermayer
                            put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
556 d87c0267 Michael Niedermayer
                            put_bits(&s->pb, 5, s->qscale);
557
                        }else{
558 bb198e19 Michael Niedermayer
                            put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
559 d87c0267 Michael Niedermayer
                        }
560 49733979 Michael Niedermayer
                        s->misc_bits+= get_bits_diff(s);
561 de6d9b64 Fabrice Bellard
                    } else {
562 d87c0267 Michael Niedermayer
                        if(s->dquant){
563 bb198e19 Michael Niedermayer
                            put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
564 d87c0267 Michael Niedermayer
                            put_bits(&s->pb, 5, s->qscale);
565
                        }else{
566 bb198e19 Michael Niedermayer
                            put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
567 d87c0267 Michael Niedermayer
                        }
568 49733979 Michael Niedermayer
                        s->misc_bits+= get_bits_diff(s);
569 63b15e55 Michael Niedermayer
                        mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
570
                        mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
571 49733979 Michael Niedermayer
                        s->mv_bits+= get_bits_diff(s);
572 de6d9b64 Fabrice Bellard
                    }
573
                } else {
574
                    put_bits(&s->pb, 3, 1); /* motion only */
575 3ab5b8cc Fabrice Bellard
                    if (!s->frame_pred_frame_dct)
576
                        put_bits(&s->pb, 2, 2); /* motion_type: frame */
577 bb198e19 Michael Niedermayer
                    s->misc_bits+= get_bits_diff(s);
578 63b15e55 Michael Niedermayer
                    mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
579
                    mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
580 d87c0267 Michael Niedermayer
                    s->qscale -= s->dquant;
581 49733979 Michael Niedermayer
                    s->mv_bits+= get_bits_diff(s);
582 de6d9b64 Fabrice Bellard
                }
583 bb198e19 Michael Niedermayer
                s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
584
                s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
585
            }else{
586
                assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
587
588
                if (cbp) {
589
                    if(s->dquant){
590
                        put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
591
                        put_bits(&s->pb, 5, s->qscale);
592
                    }else{
593
                        put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
594 63b15e55 Michael Niedermayer
                    }
595 bb198e19 Michael Niedermayer
                } else {
596
                    put_bits(&s->pb, 3, 1); /* motion only */
597
                    put_bits(&s->pb, 2, 1); /* motion_type: field */
598 63b15e55 Michael Niedermayer
                    s->qscale -= s->dquant;
599 bb198e19 Michael Niedermayer
                }
600
                s->misc_bits+= get_bits_diff(s);
601
                for(i=0; i<2; i++){
602
                    put_bits(&s->pb, 1, s->field_select[0][i]);
603
                    mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
604
                    mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
605
                    s->last_mv[0][i][0]=   s->mv[0][i][0];
606
                    s->last_mv[0][i][1]= 2*s->mv[0][i][1];
607
                }
608
                s->mv_bits+= get_bits_diff(s);
609
            }
610
            if(cbp)
611
                put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
612
            s->f_count++;
613
        } else{  
614
            static const int mb_type_len[4]={0,3,4,2}; //bak,for,bi
615
616
            if(s->mv_type == MV_TYPE_16X16){
617
                if (cbp){    // With coded bloc pattern
618
                    if (s->dquant) {
619
                        if(s->mv_dir == MV_DIR_FORWARD)
620
                            put_mb_modes(s, 6, 3, 1, 0);
621
                        else
622
                            put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 0);
623
                        put_bits(&s->pb, 5, s->qscale);
624
                    } else {
625
                        put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 0);
626
                    }
627
                }else{    // No coded bloc pattern
628
                    put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
629
                    if (!s->frame_pred_frame_dct)
630
                        put_bits(&s->pb, 2, 2); /* motion_type: frame */
631
                    s->qscale -= s->dquant;
632
                }
633
                s->misc_bits += get_bits_diff(s);
634
                if (s->mv_dir&MV_DIR_FORWARD){
635
                    mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code); 
636
                    mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code); 
637
                    s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
638
                    s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
639
                    s->f_count++;
640
                }
641
                if (s->mv_dir&MV_DIR_BACKWARD){
642
                    mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code); 
643
                    mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code); 
644
                    s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
645
                    s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
646
                    s->b_count++;
647
                }
648
            }else{
649
                assert(s->mv_type == MV_TYPE_FIELD);
650
                assert(!s->frame_pred_frame_dct);
651
                if (cbp){    // With coded bloc pattern
652
                    if (s->dquant) {
653
                        if(s->mv_dir == MV_DIR_FORWARD)
654
                            put_mb_modes(s, 6, 3, 1, 1);
655
                        else
656
                            put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 1);
657
                        put_bits(&s->pb, 5, s->qscale);
658
                    } else {
659
                        put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 1);
660 63b15e55 Michael Niedermayer
                    }
661 bb198e19 Michael Niedermayer
                }else{    // No coded bloc pattern
662
                    put_bits(&s->pb, mb_type_len[s->mv_dir], 2);
663
                    put_bits(&s->pb, 2, 1); /* motion_type: field */
664
                    s->qscale -= s->dquant;
665
                }
666
                s->misc_bits += get_bits_diff(s);
667
                if (s->mv_dir&MV_DIR_FORWARD){
668
                    for(i=0; i<2; i++){
669
                        put_bits(&s->pb, 1, s->field_select[0][i]);
670
                        mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
671
                        mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
672
                        s->last_mv[0][i][0]=   s->mv[0][i][0];
673
                        s->last_mv[0][i][1]= 2*s->mv[0][i][1];
674
                    }
675
                    s->f_count++;
676
                }
677
                if (s->mv_dir&MV_DIR_BACKWARD){
678
                    for(i=0; i<2; i++){
679
                        put_bits(&s->pb, 1, s->field_select[1][i]);
680
                        mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
681
                        mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
682
                        s->last_mv[1][i][0]=   s->mv[1][i][0];
683
                        s->last_mv[1][i][1]= 2*s->mv[1][i][1];
684
                    }
685
                    s->b_count++;
686
                }
687 de6d9b64 Fabrice Bellard
            }
688 bb198e19 Michael Niedermayer
            s->mv_bits += get_bits_diff(s);
689
            if(cbp)
690
                put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
691
        }
692 de6d9b64 Fabrice Bellard
        for(i=0;i<6;i++) {
693
            if (cbp & (1 << (5 - i))) {
694
                mpeg1_encode_block(s, block[i], i);
695
            }
696
        }
697 9b8709d1 Michael Niedermayer
        s->mb_skip_run = 0;
698 49733979 Michael Niedermayer
        if(s->mb_intra)
699
            s->i_tex_bits+= get_bits_diff(s);
700
        else
701
            s->p_tex_bits+= get_bits_diff(s);
702 de6d9b64 Fabrice Bellard
    }
703
}
704
705 63b15e55 Michael Niedermayer
// RAL: Parameter added: f_or_b_code
706
static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
707 de6d9b64 Fabrice Bellard
{
708
    int code, bit_size, l, m, bits, range, sign;
709
710
    if (val == 0) {
711
        /* zero vector */
712
        code = 0;
713
        put_bits(&s->pb,
714
                 mbMotionVectorTable[0][1], 
715
                 mbMotionVectorTable[0][0]); 
716
    } else {
717 63b15e55 Michael Niedermayer
        bit_size = f_or_b_code - 1;
718 de6d9b64 Fabrice Bellard
        range = 1 << bit_size;
719
        /* modulo encoding */
720
        l = 16 * range;
721
        m = 2 * l;
722
        if (val < -l) {
723
            val += m;
724
        } else if (val >= l) {
725
            val -= m;
726
        }
727
728
        if (val >= 0) {
729
            val--;
730
            code = (val >> bit_size) + 1;
731
            bits = val & (range - 1);
732
            sign = 0;
733
        } else {
734
            val = -val;
735
            val--;
736
            code = (val >> bit_size) + 1;
737
            bits = val & (range - 1);
738
            sign = 1;
739
        }
740 63b15e55 Michael Niedermayer
741
        assert(code > 0 && code <= 16);
742
743 de6d9b64 Fabrice Bellard
        put_bits(&s->pb,
744
                 mbMotionVectorTable[code][1], 
745
                 mbMotionVectorTable[code][0]); 
746 63b15e55 Michael Niedermayer
747 de6d9b64 Fabrice Bellard
        put_bits(&s->pb, 1, sign);
748
        if (bit_size > 0) {
749
            put_bits(&s->pb, bit_size, bits);
750
        }
751
    }
752
}
753
754 8f8402e4 Michael Niedermayer
void ff_mpeg1_encode_init(MpegEncContext *s)
755 11ce8834 Michael Niedermayer
{
756
    static int done=0;
757 8f8402e4 Michael Niedermayer
758
    common_init(s);
759
760 11ce8834 Michael Niedermayer
    if(!done){
761
        int f_code;
762
        int mv;
763 8f8402e4 Michael Niedermayer
        int i;
764 11ce8834 Michael Niedermayer
765
        done=1;
766 8f8402e4 Michael Niedermayer
        init_rl(&rl_mpeg1);
767 c442d75c Michael Niedermayer
768 8f8402e4 Michael Niedermayer
        for(i=0; i<64; i++)
769
        {
770
                mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
771
                mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
772
        }
773 c442d75c Michael Niedermayer
        
774
        init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_bits, uni_mpeg1_ac_vlc_len);
775 8f8402e4 Michael Niedermayer
776
        /* build unified dc encoding tables */
777
        for(i=-255; i<256; i++)
778
        {
779
                int adiff, index;
780
                int bits, code;
781
                int diff=i;
782
783
                adiff = ABS(diff);
784
                if(diff<0) diff--;
785
                index = vlc_dc_table[adiff];
786
787
                bits= vlc_dc_lum_bits[index] + index;
788
                code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
789
                mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
790
                
791
                bits= vlc_dc_chroma_bits[index] + index;
792
                code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
793
                mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
794
        }
795
796 30952237 Michael Niedermayer
        mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
797
798 11ce8834 Michael Niedermayer
        for(f_code=1; f_code<=MAX_FCODE; f_code++){
799
            for(mv=-MAX_MV; mv<=MAX_MV; mv++){
800
                int len;
801
802
                if(mv==0) len= mbMotionVectorTable[0][1];
803
                else{
804
                    int val, bit_size, range, code;
805
806
                    bit_size = s->f_code - 1;
807
                    range = 1 << bit_size;
808
809
                    val=mv;
810
                    if (val < 0) 
811
                        val = -val;
812
                    val--;
813
                    code = (val >> bit_size) + 1;
814
                    if(code<17){
815
                        len= mbMotionVectorTable[code][1] + 1 + bit_size;
816
                    }else{
817
                        len= mbMotionVectorTable[16][1] + 2 + bit_size;
818
                    }
819
                }
820
821
                mv_penalty[f_code][mv+MAX_MV]= len;
822
            }
823
        }
824
        
825
826
        for(f_code=MAX_FCODE; f_code>0; f_code--){
827
            for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
828
                fcode_tab[mv+MAX_MV]= f_code;
829
            }
830
        }
831
    }
832 1457ab52 Michael Niedermayer
    s->me.mv_penalty= mv_penalty;
833 11ce8834 Michael Niedermayer
    s->fcode_tab= fcode_tab;
834 029911d1 Michael Niedermayer
    if(s->codec_id == CODEC_ID_MPEG1VIDEO){
835
        s->min_qcoeff=-255;
836
        s->max_qcoeff= 255;
837
    }else{
838
        s->min_qcoeff=-2047;
839
        s->max_qcoeff= 2047;
840
    }
841 c442d75c Michael Niedermayer
    s->intra_ac_vlc_length=
842 e5021fff Michael Niedermayer
    s->inter_ac_vlc_length=
843
    s->intra_ac_vlc_last_length=
844
    s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
845 11ce8834 Michael Niedermayer
}
846 8f8402e4 Michael Niedermayer
847 de6d9b64 Fabrice Bellard
static inline void encode_dc(MpegEncContext *s, int diff, int component)
848
{
849
    if (component == 0) {
850 f004ca1c Michael Niedermayer
        put_bits(
851
            &s->pb, 
852
            mpeg1_lum_dc_uni[diff+255]&0xFF,
853
            mpeg1_lum_dc_uni[diff+255]>>8);
854 de6d9b64 Fabrice Bellard
    } else {
855 f004ca1c Michael Niedermayer
        put_bits(
856
            &s->pb, 
857
            mpeg1_chr_dc_uni[diff+255]&0xFF,
858
            mpeg1_chr_dc_uni[diff+255]>>8);
859 de6d9b64 Fabrice Bellard
    }
860
}
861
862
static void mpeg1_encode_block(MpegEncContext *s, 
863
                               DCTELEM *block, 
864
                               int n)
865
{
866
    int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
867
    int code, component;
868 80feb2a2 Michael Niedermayer
//    RLTable *rl = &rl_mpeg1;
869 de6d9b64 Fabrice Bellard
870
    last_index = s->block_last_index[n];
871
872
    /* DC coef */
873
    if (s->mb_intra) {
874
        component = (n <= 3 ? 0 : n - 4 + 1);
875
        dc = block[0]; /* overflow is impossible */
876
        diff = dc - s->last_dc[component];
877
        encode_dc(s, diff, component);
878
        s->last_dc[component] = dc;
879
        i = 1;
880 029911d1 Michael Niedermayer
/*
881
        if (s->intra_vlc_format)
882
            rl = &rl_mpeg2;
883
        else
884
            rl = &rl_mpeg1;
885
*/
886 de6d9b64 Fabrice Bellard
    } else {
887
        /* encode the first coefficient : needs to be done here because
888
           it is handled slightly differently */
889
        level = block[0];
890
        if (abs(level) == 1) {
891 0c1a9eda Zdenek Kabelac
                code = ((uint32_t)level >> 31); /* the sign bit */
892 de6d9b64 Fabrice Bellard
                put_bits(&s->pb, 2, code | 0x02);
893
                i = 1;
894
        } else {
895
            i = 0;
896
            last_non_zero = -1;
897
            goto next_coef;
898
        }
899
    }
900
901
    /* now quantify & encode AC coefs */
902
    last_non_zero = i - 1;
903 80feb2a2 Michael Niedermayer
904 de6d9b64 Fabrice Bellard
    for(;i<=last_index;i++) {
905 2ad1516a Michael Niedermayer
        j = s->intra_scantable.permutated[i];
906 de6d9b64 Fabrice Bellard
        level = block[j];
907
    next_coef:
908
#if 0
909
        if (level != 0)
910
            dprintf("level[%d]=%d\n", i, level);
911
#endif            
912
        /* encode using VLC */
913
        if (level != 0) {
914
            run = i - last_non_zero - 1;
915 2ad1516a Michael Niedermayer
            
916
            alevel= level;
917
            MASK_ABS(sign, alevel)
918
            sign&=1;
919
920 80feb2a2 Michael Niedermayer
//            code = get_rl_index(rl, 0, run, alevel);
921 c442d75c Michael Niedermayer
            if (alevel <= mpeg1_max_level[0][run]){
922 80feb2a2 Michael Niedermayer
                code= mpeg1_index_run[0][run] + alevel - 1;
923
                    /* store the vlc & sign at once */
924
                put_bits(&s->pb, mpeg1_vlc[code][1]+1, (mpeg1_vlc[code][0]<<1) + sign);
925 de6d9b64 Fabrice Bellard
            } else {
926 80feb2a2 Michael Niedermayer
                /* escape seems to be pretty rare <5% so i dont optimize it */
927
                put_bits(&s->pb, mpeg1_vlc[111/*rl->n*/][1], mpeg1_vlc[111/*rl->n*/][0]);
928 de6d9b64 Fabrice Bellard
                /* escape: only clip in this case */
929
                put_bits(&s->pb, 6, run);
930 029911d1 Michael Niedermayer
                if(s->codec_id == CODEC_ID_MPEG1VIDEO){
931
                    if (alevel < 128) {
932
                        put_bits(&s->pb, 8, level & 0xff);
933 de6d9b64 Fabrice Bellard
                    } else {
934 029911d1 Michael Niedermayer
                        if (level < 0) {
935
                            put_bits(&s->pb, 16, 0x8001 + level + 255);
936
                        } else {
937
                            put_bits(&s->pb, 16, level & 0xffff);
938
                        }
939 de6d9b64 Fabrice Bellard
                    }
940 029911d1 Michael Niedermayer
                }else{
941
                    put_bits(&s->pb, 12, level & 0xfff);
942 de6d9b64 Fabrice Bellard
                }
943
            }
944
            last_non_zero = i;
945
        }
946
    }
947
    /* end of block */
948
    put_bits(&s->pb, 2, 0x2);
949
}
950 7604246d Wolfgang Hesseler
#endif //CONFIG_ENCODERS
951 de6d9b64 Fabrice Bellard
952
/******************************************/
953
/* decoding */
954
955
static VLC dc_lum_vlc;
956
static VLC dc_chroma_vlc;
957
static VLC mv_vlc;
958
static VLC mbincr_vlc;
959
static VLC mb_ptype_vlc;
960
static VLC mb_btype_vlc;
961
static VLC mb_pat_vlc;
962
963 c3bf0288 Michael Niedermayer
static void init_vlcs()
964 de6d9b64 Fabrice Bellard
{
965
    static int done = 0;
966
967
    if (!done) {
968 915bbac6 Fabrice Bellard
        done = 1;
969 de6d9b64 Fabrice Bellard
970 9ac7ecd6 Michael Niedermayer
        init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12, 
971 de6d9b64 Fabrice Bellard
                 vlc_dc_lum_bits, 1, 1,
972
                 vlc_dc_lum_code, 2, 2);
973 9ac7ecd6 Michael Niedermayer
        init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12, 
974 de6d9b64 Fabrice Bellard
                 vlc_dc_chroma_bits, 1, 1,
975
                 vlc_dc_chroma_code, 2, 2);
976 8ed2ddb2 Michael Niedermayer
        init_vlc(&mv_vlc, MV_VLC_BITS, 17, 
977 de6d9b64 Fabrice Bellard
                 &mbMotionVectorTable[0][1], 2, 1,
978
                 &mbMotionVectorTable[0][0], 2, 1);
979 9c00c3af Michael Niedermayer
        init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36, 
980 de6d9b64 Fabrice Bellard
                 &mbAddrIncrTable[0][1], 2, 1,
981
                 &mbAddrIncrTable[0][0], 2, 1);
982 8ed2ddb2 Michael Niedermayer
        init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 63, 
983 de6d9b64 Fabrice Bellard
                 &mbPatTable[0][1], 2, 1,
984
                 &mbPatTable[0][0], 2, 1);
985
        
986 7bc9090a Michael Niedermayer
        init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7, 
987 de6d9b64 Fabrice Bellard
                 &table_mb_ptype[0][1], 2, 1,
988
                 &table_mb_ptype[0][0], 2, 1);
989 7bc9090a Michael Niedermayer
        init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11, 
990 de6d9b64 Fabrice Bellard
                 &table_mb_btype[0][1], 2, 1,
991
                 &table_mb_btype[0][0], 2, 1);
992
        init_rl(&rl_mpeg1);
993
        init_rl(&rl_mpeg2);
994 4f68b084 Michael Niedermayer
995
        init_2d_vlc_rl(&rl_mpeg1);
996
        init_2d_vlc_rl(&rl_mpeg2);
997 de6d9b64 Fabrice Bellard
    }
998
}
999
1000
static inline int get_dmv(MpegEncContext *s)
1001
{
1002 612476ef Arpi
    if(get_bits1(&s->gb)) 
1003
        return 1 - (get_bits1(&s->gb) << 1);
1004 de6d9b64 Fabrice Bellard
    else
1005
        return 0;
1006
}
1007
1008 0ee50938 Fabrice Bellard
static inline int get_qscale(MpegEncContext *s)
1009
{
1010 7062fad6 BERO
    int qscale = get_bits(&s->gb, 5);
1011 029911d1 Michael Niedermayer
    if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1012 0ee50938 Fabrice Bellard
        if (s->q_scale_type) {
1013 7062fad6 BERO
            return non_linear_qscale[qscale];
1014 0ee50938 Fabrice Bellard
        } else {
1015 7062fad6 BERO
            return qscale << 1;
1016 0ee50938 Fabrice Bellard
        }
1017
    }
1018
    return qscale;
1019
}
1020
1021 de6d9b64 Fabrice Bellard
/* motion type (for mpeg2) */
1022
#define MT_FIELD 1
1023
#define MT_FRAME 2
1024
#define MT_16X8  2
1025
#define MT_DMV   3
1026
1027
static int mpeg_decode_mb(MpegEncContext *s,
1028
                          DCTELEM block[6][64])
1029
{
1030 d2975f8d Michael Niedermayer
    int i, j, k, cbp, val, mb_type, motion_type;
1031 de6d9b64 Fabrice Bellard
    
1032
    dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
1033
1034 f943e138 Michael Niedermayer
    assert(s->mb_skiped==0);
1035
1036 9b8709d1 Michael Niedermayer
    if (s->mb_skip_run-- != 0) {
1037 7bc9090a Michael Niedermayer
        if(s->pict_type == I_TYPE){
1038 9b879566 Michel Bardiaux
            av_log(s->avctx, AV_LOG_ERROR, "skiped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1039 7bc9090a Michael Niedermayer
            return -1;
1040
        }
1041
    
1042 de6d9b64 Fabrice Bellard
        /* skip mb */
1043
        s->mb_intra = 0;
1044
        for(i=0;i<6;i++)
1045
            s->block_last_index[i] = -1;
1046
        s->mv_type = MV_TYPE_16X16;
1047
        if (s->pict_type == P_TYPE) {
1048
            /* if P type, zero motion vector is implied */
1049
            s->mv_dir = MV_DIR_FORWARD;
1050
            s->mv[0][0][0] = s->mv[0][0][1] = 0;
1051
            s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1052 25ed7f92 Fabrice Bellard
            s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1053 f943e138 Michael Niedermayer
            s->mb_skiped = 1;
1054 7bc9090a Michael Niedermayer
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1055 de6d9b64 Fabrice Bellard
        } else {
1056
            /* if B type, reuse previous vectors and directions */
1057
            s->mv[0][0][0] = s->last_mv[0][0][0];
1058
            s->mv[0][0][1] = s->last_mv[0][0][1];
1059
            s->mv[1][0][0] = s->last_mv[1][0][0];
1060
            s->mv[1][0][1] = s->last_mv[1][0][1];
1061 f943e138 Michael Niedermayer
1062 7bc9090a Michael Niedermayer
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= 
1063
                s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1] | MB_TYPE_SKIP;
1064
//            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
1065
1066 f943e138 Michael Niedermayer
            if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0) 
1067
                s->mb_skiped = 1;
1068 de6d9b64 Fabrice Bellard
        }
1069 59b571c1 Michael Niedermayer
1070 de6d9b64 Fabrice Bellard
        return 0;
1071
    }
1072
1073
    switch(s->pict_type) {
1074
    default:
1075
    case I_TYPE:
1076 612476ef Arpi
        if (get_bits1(&s->gb) == 0) {
1077 e94bc100 Michael Niedermayer
            if (get_bits1(&s->gb) == 0){
1078 9b879566 Michel Bardiaux
                av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1079 de6d9b64 Fabrice Bellard
                return -1;
1080 e94bc100 Michael Niedermayer
            }
1081 7bc9090a Michael Niedermayer
            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1082 de6d9b64 Fabrice Bellard
        } else {
1083 7bc9090a Michael Niedermayer
            mb_type = MB_TYPE_INTRA;
1084 de6d9b64 Fabrice Bellard
        }
1085
        break;
1086
    case P_TYPE:
1087 8ed2ddb2 Michael Niedermayer
        mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1088 9ac7ecd6 Michael Niedermayer
        if (mb_type < 0){
1089 9b879566 Michel Bardiaux
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1090 de6d9b64 Fabrice Bellard
            return -1;
1091 9ac7ecd6 Michael Niedermayer
        }
1092 7bc9090a Michael Niedermayer
        mb_type = ptype2mb_type[ mb_type ];
1093 de6d9b64 Fabrice Bellard
        break;
1094
    case B_TYPE:
1095 8ed2ddb2 Michael Niedermayer
        mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1096 9ac7ecd6 Michael Niedermayer
        if (mb_type < 0){
1097 9b879566 Michel Bardiaux
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1098 de6d9b64 Fabrice Bellard
            return -1;
1099 9ac7ecd6 Michael Niedermayer
        }
1100 7bc9090a Michael Niedermayer
        mb_type = btype2mb_type[ mb_type ];
1101 de6d9b64 Fabrice Bellard
        break;
1102
    }
1103
    dprintf("mb_type=%x\n", mb_type);
1104 7bc9090a Michael Niedermayer
//    motion_type = 0; /* avoid warning */
1105
    if (IS_INTRA(mb_type)) {
1106
        /* compute dct type */
1107
        if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1108
            !s->frame_pred_frame_dct) {
1109
            s->interlaced_dct = get_bits1(&s->gb);
1110
        }
1111 de6d9b64 Fabrice Bellard
1112 7bc9090a Michael Niedermayer
        if (IS_QUANT(mb_type))
1113
            s->qscale = get_qscale(s);
1114
        
1115 de6d9b64 Fabrice Bellard
        if (s->concealment_motion_vectors) {
1116
            /* just parse them */
1117
            if (s->picture_structure != PICT_FRAME) 
1118 612476ef Arpi
                skip_bits1(&s->gb); /* field select */
1119 daab3296 Michael Niedermayer
            
1120
            s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] = 
1121
                mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
1122
            s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] = 
1123
                mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
1124
1125 7bc9090a Michael Niedermayer
            skip_bits1(&s->gb); /* marker */
1126 daab3296 Michael Niedermayer
        }else
1127
            memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1128 de6d9b64 Fabrice Bellard
        s->mb_intra = 1;
1129 a579db0c Ivan Kalvachev
#ifdef HAVE_XVMC
1130
        //one 1 we memcpy blocks in xvmcvideo
1131
        if(s->avctx->xvmc_acceleration > 1){
1132
            XVMC_pack_pblocks(s,-1);//inter are always full blocks
1133
            if(s->swap_uv){
1134
                exchange_uv(s);
1135
            }
1136
        }
1137
#endif
1138 7bc9090a Michael Niedermayer
1139 029911d1 Michael Niedermayer
        if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1140 7bc9090a Michael Niedermayer
            for(i=0;i<6;i++) {
1141 a579db0c Ivan Kalvachev
                if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
1142 7bc9090a Michael Niedermayer
                    return -1;
1143
            }
1144
        } else {
1145
            for(i=0;i<6;i++) {
1146 a579db0c Ivan Kalvachev
                if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
1147 7bc9090a Michael Niedermayer
                    return -1;
1148
            }
1149
        }
1150 de6d9b64 Fabrice Bellard
    } else {
1151 7bc9090a Michael Niedermayer
        if (mb_type & MB_TYPE_ZERO_MV){
1152 b40cd4e0 Michael Niedermayer
            assert(mb_type & MB_TYPE_CBP);
1153 7bc9090a Michael Niedermayer
1154
            /* compute dct type */
1155
            if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1156
                !s->frame_pred_frame_dct) {
1157
                s->interlaced_dct = get_bits1(&s->gb);
1158
            }
1159
1160
            if (IS_QUANT(mb_type))
1161
                s->qscale = get_qscale(s);
1162
1163
            s->mv_dir = MV_DIR_FORWARD;
1164
            s->mv_type = MV_TYPE_16X16;
1165
            s->last_mv[0][0][0] = 0;
1166
            s->last_mv[0][0][1] = 0;
1167
            s->last_mv[0][1][0] = 0;
1168
            s->last_mv[0][1][1] = 0;
1169
            s->mv[0][0][0] = 0;
1170
            s->mv[0][0][1] = 0;
1171
        }else{
1172
            assert(mb_type & MB_TYPE_L0L1);
1173
//FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
1174
            /* get additionnal motion vector type */
1175
            if (s->frame_pred_frame_dct) 
1176
                motion_type = MT_FRAME;
1177
            else{
1178
                motion_type = get_bits(&s->gb, 2);
1179
            }
1180
1181
            /* compute dct type */
1182
            if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
1183 b40cd4e0 Michael Niedermayer
                !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
1184 7bc9090a Michael Niedermayer
                s->interlaced_dct = get_bits1(&s->gb);
1185
            }
1186
1187
            if (IS_QUANT(mb_type))
1188
                s->qscale = get_qscale(s);
1189
1190
            /* motion vectors */
1191
            s->mv_dir = 0;
1192
            for(i=0;i<2;i++) {
1193
                if (USES_LIST(mb_type, i)) {
1194
                    s->mv_dir |= (MV_DIR_FORWARD >> i);
1195
                    dprintf("motion_type=%d\n", motion_type);
1196
                    switch(motion_type) {
1197
                    case MT_FRAME: /* or MT_16X8 */
1198
                        if (s->picture_structure == PICT_FRAME) {
1199
                            /* MT_FRAME */
1200
                            mb_type |= MB_TYPE_16x16; 
1201
                            s->mv_type = MV_TYPE_16X16;
1202
                            s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] = 
1203
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
1204
                            s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] = 
1205
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
1206 de6d9b64 Fabrice Bellard
                            /* full_pel: only for mpeg1 */
1207 7bc9090a Michael Niedermayer
                            if (s->full_pel[i]){
1208
                                s->mv[i][0][0] <<= 1;
1209
                                s->mv[i][0][1] <<= 1;
1210
                            }
1211
                        } else {
1212
                            /* MT_16X8 */
1213 26f548a7 Michael Niedermayer
                            mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; 
1214 7bc9090a Michael Niedermayer
                            s->mv_type = MV_TYPE_16X8;
1215
                            for(j=0;j<2;j++) {
1216
                                s->field_select[i][j] = get_bits1(&s->gb);
1217
                                for(k=0;k<2;k++) {
1218
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1219
                                                             s->last_mv[i][j][k]);
1220
                                    s->last_mv[i][j][k] = val;
1221
                                    s->mv[i][j][k] = val;
1222
                                }
1223
                            }
1224 de6d9b64 Fabrice Bellard
                        }
1225 7bc9090a Michael Niedermayer
                        break;
1226
                    case MT_FIELD:
1227
                        s->mv_type = MV_TYPE_FIELD;
1228
                        if (s->picture_structure == PICT_FRAME) {
1229
                            mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; 
1230
                            for(j=0;j<2;j++) {
1231
                                s->field_select[i][j] = get_bits1(&s->gb);
1232
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1233
                                                         s->last_mv[i][j][0]);
1234
                                s->last_mv[i][j][0] = val;
1235
                                s->mv[i][j][0] = val;
1236
                                dprintf("fmx=%d\n", val);
1237
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1238
                                                         s->last_mv[i][j][1] >> 1);
1239
                                s->last_mv[i][j][1] = val << 1;
1240
                                s->mv[i][j][1] = val;
1241
                                dprintf("fmy=%d\n", val);
1242
                            }
1243
                        } else {
1244 26f548a7 Michael Niedermayer
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; 
1245 7bc9090a Michael Niedermayer
                            s->field_select[i][0] = get_bits1(&s->gb);
1246 de6d9b64 Fabrice Bellard
                            for(k=0;k<2;k++) {
1247
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1248 7bc9090a Michael Niedermayer
                                                         s->last_mv[i][0][k]);
1249
                                s->last_mv[i][0][k] = val;
1250
                                s->last_mv[i][1][k] = val;
1251
                                s->mv[i][0][k] = val;
1252 de6d9b64 Fabrice Bellard
                            }
1253
                        }
1254 7bc9090a Michael Niedermayer
                        break;
1255
                    case MT_DMV:
1256
                        {
1257
                            int dmx, dmy, mx, my, m;
1258
1259
                            mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0], 
1260
                                                    s->last_mv[i][0][0]);
1261
                            s->last_mv[i][0][0] = mx;
1262
                            s->last_mv[i][1][0] = mx;
1263
                            dmx = get_dmv(s);
1264
                            my = mpeg_decode_motion(s, s->mpeg_f_code[i][1], 
1265
                                                    s->last_mv[i][0][1] >> 1);
1266
                            dmy = get_dmv(s);
1267
                            s->mv_type = MV_TYPE_DMV;
1268 1dff7d56 Ivan Kalvachev
1269
1270
                            s->last_mv[i][0][1] = my<<1;
1271
                            s->last_mv[i][1][1] = my<<1;
1272
1273
                            s->mv[i][0][0] = mx;
1274
                            s->mv[i][0][1] = my;
1275
                            s->mv[i][1][0] = mx;//not used
1276
                            s->mv[i][1][1] = my;//not used
1277
1278 7bc9090a Michael Niedermayer
                            if (s->picture_structure == PICT_FRAME) {
1279
                                mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; 
1280
1281 1dff7d56 Ivan Kalvachev
                                //m = 1 + 2 * s->top_field_first;
1282 7bc9090a Michael Niedermayer
                                m = s->top_field_first ? 1 : 3;
1283 1dff7d56 Ivan Kalvachev
1284 7bc9090a Michael Niedermayer
                                /* top -> top pred */
1285 1dff7d56 Ivan Kalvachev
                                s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1286
                                s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1287 7bc9090a Michael Niedermayer
                                m = 4 - m;
1288
                                s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1289
                                s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1290
                            } else {
1291
                                mb_type |= MB_TYPE_16x16;
1292
1293 1dff7d56 Ivan Kalvachev
                                s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1294
                                s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1295
                                if(s->picture_structure == PICT_TOP_FIELD)
1296
                                    s->mv[i][2][1]--;
1297
                                else 
1298
                                    s->mv[i][2][1]++;
1299 7bc9090a Michael Niedermayer
                            }
1300 de6d9b64 Fabrice Bellard
                        }
1301 7bc9090a Michael Niedermayer
                        break;
1302 26f548a7 Michael Niedermayer
                    default:
1303
                        av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1304
                        return -1;
1305 de6d9b64 Fabrice Bellard
                    }
1306
                }
1307
            }
1308
        }
1309 7bc9090a Michael Niedermayer
        
1310
        s->mb_intra = 0;
1311 de6d9b64 Fabrice Bellard
1312 b40cd4e0 Michael Niedermayer
        if (HAS_CBP(mb_type)) {
1313 7bc9090a Michael Niedermayer
            cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1314
            if (cbp < 0){
1315 9b879566 Michel Bardiaux
                av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1316 7bc9090a Michael Niedermayer
                return -1;
1317 de6d9b64 Fabrice Bellard
            }
1318 7bc9090a Michael Niedermayer
            cbp++;
1319
1320 a579db0c Ivan Kalvachev
#ifdef HAVE_XVMC
1321
            //on 1 we memcpy blocks in xvmcvideo
1322
            if(s->avctx->xvmc_acceleration > 1){
1323
                XVMC_pack_pblocks(s,cbp);
1324
                if(s->swap_uv){
1325
                    exchange_uv(s);
1326
                }
1327
            }    
1328
#endif
1329
1330 029911d1 Michael Niedermayer
            if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1331 7bc9090a Michael Niedermayer
                for(i=0;i<6;i++) {
1332
                    if (cbp & 32) {
1333 a579db0c Ivan Kalvachev
                        if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1334 7bc9090a Michael Niedermayer
                            return -1;
1335
                    } else {
1336
                        s->block_last_index[i] = -1;
1337
                    }
1338
                    cbp+=cbp;
1339 de6d9b64 Fabrice Bellard
                }
1340 7bc9090a Michael Niedermayer
            } else {
1341
                for(i=0;i<6;i++) {
1342
                    if (cbp & 32) {
1343 a579db0c Ivan Kalvachev
                        if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
1344 7bc9090a Michael Niedermayer
                            return -1;
1345
                    } else {
1346
                        s->block_last_index[i] = -1;
1347
                    }
1348
                    cbp+=cbp;
1349 a0201736 Michael Niedermayer
                }
1350 de6d9b64 Fabrice Bellard
            }
1351 7bc9090a Michael Niedermayer
        }else{
1352
            for(i=0;i<6;i++)
1353
                s->block_last_index[i] = -1;
1354 de6d9b64 Fabrice Bellard
        }
1355
    }
1356 7bc9090a Michael Niedermayer
1357
    s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1358
1359 de6d9b64 Fabrice Bellard
    return 0;
1360
}
1361
1362
/* as h263, but only 17 codes */
1363
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
1364
{
1365 05858889 BERO
    int code, sign, val, l, shift;
1366 de6d9b64 Fabrice Bellard
1367 8ed2ddb2 Michael Niedermayer
    code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1368 de6d9b64 Fabrice Bellard
    if (code == 0) {
1369
        return pred;
1370
    }
1371 7bc9090a Michael Niedermayer
    if (code < 0) {
1372
        return 0xffff;
1373
    }
1374
1375 612476ef Arpi
    sign = get_bits1(&s->gb);
1376 de6d9b64 Fabrice Bellard
    shift = fcode - 1;
1377 05858889 BERO
    val = code;
1378
    if (shift) {
1379
        val = (val - 1) << shift;
1380 de6d9b64 Fabrice Bellard
        val |= get_bits(&s->gb, shift);
1381 05858889 BERO
        val++;
1382
    }
1383 de6d9b64 Fabrice Bellard
    if (sign)
1384
        val = -val;
1385
    val += pred;
1386
    
1387
    /* modulo decoding */
1388 7bc9090a Michael Niedermayer
    l = 1 << (shift+4);
1389 05858889 BERO
    val = ((val + l)&(l*2-1)) - l;
1390 de6d9b64 Fabrice Bellard
    return val;
1391
}
1392
1393 c3bf0288 Michael Niedermayer
static inline int decode_dc(GetBitContext *gb, int component)
1394 de6d9b64 Fabrice Bellard
{
1395
    int code, diff;
1396
1397
    if (component == 0) {
1398 c3bf0288 Michael Niedermayer
        code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1399 de6d9b64 Fabrice Bellard
    } else {
1400 c3bf0288 Michael Niedermayer
        code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1401 de6d9b64 Fabrice Bellard
    }
1402 9ac7ecd6 Michael Niedermayer
    if (code < 0){
1403 9b879566 Michel Bardiaux
        av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
1404 de6d9b64 Fabrice Bellard
        return 0xffff;
1405 9ac7ecd6 Michael Niedermayer
    }
1406 de6d9b64 Fabrice Bellard
    if (code == 0) {
1407
        diff = 0;
1408
    } else {
1409 c3bf0288 Michael Niedermayer
        diff = get_xbits(gb, code);
1410 de6d9b64 Fabrice Bellard
    }
1411
    return diff;
1412
}
1413
1414 a0201736 Michael Niedermayer
static inline int mpeg1_decode_block_intra(MpegEncContext *s, 
1415 de6d9b64 Fabrice Bellard
                               DCTELEM *block, 
1416
                               int n)
1417
{
1418
    int level, dc, diff, i, j, run;
1419 a0201736 Michael Niedermayer
    int component;
1420 de6d9b64 Fabrice Bellard
    RLTable *rl = &rl_mpeg1;
1421 0c1a9eda Zdenek Kabelac
    uint8_t * const scantable= s->intra_scantable.permutated;
1422
    const uint16_t *quant_matrix= s->intra_matrix;
1423 a0201736 Michael Niedermayer
    const int qscale= s->qscale;
1424 de6d9b64 Fabrice Bellard
1425 a0201736 Michael Niedermayer
    /* DC coef */
1426
    component = (n <= 3 ? 0 : n - 4 + 1);
1427 c3bf0288 Michael Niedermayer
    diff = decode_dc(&s->gb, component);
1428 a0201736 Michael Niedermayer
    if (diff >= 0xffff)
1429
        return -1;
1430
    dc = s->last_dc[component];
1431
    dc += diff;
1432
    s->last_dc[component] = dc;
1433
    block[0] = dc<<3;
1434
    dprintf("dc=%d diff=%d\n", dc, diff);
1435
    i = 0;
1436
    {
1437
        OPEN_READER(re, &s->gb);    
1438
        /* now quantify & encode AC coefs */
1439
        for(;;) {
1440
            UPDATE_CACHE(re, &s->gb);
1441
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1442
            
1443
            if(level == 127){
1444
                break;
1445
            } else if(level != 0) {
1446
                i += run;
1447
                j = scantable[i];
1448
                level= (level*qscale*quant_matrix[j])>>3;
1449
                level= (level-1)|1;
1450
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1451
                LAST_SKIP_BITS(re, &s->gb, 1);
1452
            } else {
1453
                /* escape */
1454
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1455
                UPDATE_CACHE(re, &s->gb);
1456
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1457
                if (level == -128) {
1458
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1459
                } else if (level == 0) {
1460
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1461
                }
1462
                i += run;
1463
                j = scantable[i];
1464
                if(level<0){
1465
                    level= -level;
1466
                    level= (level*qscale*quant_matrix[j])>>3;
1467
                    level= (level-1)|1;
1468
                    level= -level;
1469
                }else{
1470
                    level= (level*qscale*quant_matrix[j])>>3;
1471
                    level= (level-1)|1;
1472
                }
1473
            }
1474
            if (i > 63){
1475 9b879566 Michel Bardiaux
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1476 a0201736 Michael Niedermayer
                return -1;
1477
            }
1478
1479
            block[j] = level;
1480
        }
1481
        CLOSE_READER(re, &s->gb);
1482
    }
1483
    s->block_last_index[n] = i;
1484
   return 0;
1485
}
1486
1487
static inline int mpeg1_decode_block_inter(MpegEncContext *s, 
1488
                               DCTELEM *block, 
1489
                               int n)
1490
{
1491
    int level, i, j, run;
1492
    RLTable *rl = &rl_mpeg1;
1493 0c1a9eda Zdenek Kabelac
    uint8_t * const scantable= s->intra_scantable.permutated;
1494
    const uint16_t *quant_matrix= s->inter_matrix;
1495 a0201736 Michael Niedermayer
    const int qscale= s->qscale;
1496
1497
    {
1498 8db1a1dd Michael Niedermayer
        int v;
1499
        OPEN_READER(re, &s->gb);
1500 a0201736 Michael Niedermayer
        i = -1;
1501 de6d9b64 Fabrice Bellard
        /* special case for the first coef. no need to add a second vlc table */
1502 8db1a1dd Michael Niedermayer
        UPDATE_CACHE(re, &s->gb);
1503
        v= SHOW_UBITS(re, &s->gb, 2);
1504 de6d9b64 Fabrice Bellard
        if (v & 2) {
1505 3729c912 Michael Niedermayer
            LAST_SKIP_BITS(re, &s->gb, 2);
1506 a0201736 Michael Niedermayer
            level= (3*qscale*quant_matrix[0])>>4;
1507
            level= (level-1)|1;
1508
            if(v&1)
1509
                level= -level;
1510 3729c912 Michael Niedermayer
            block[0] = level;
1511 a0201736 Michael Niedermayer
            i++;
1512 de6d9b64 Fabrice Bellard
        }
1513 3729c912 Michael Niedermayer
1514 a0201736 Michael Niedermayer
        /* now quantify & encode AC coefs */
1515
        for(;;) {
1516
            UPDATE_CACHE(re, &s->gb);
1517
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1518
            
1519
            if(level == 127){
1520
                break;
1521
            } else if(level != 0) {
1522
                i += run;
1523
                j = scantable[i];
1524
                level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1525
                level= (level-1)|1;
1526
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1527
                LAST_SKIP_BITS(re, &s->gb, 1);
1528
            } else {
1529
                /* escape */
1530
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1531
                UPDATE_CACHE(re, &s->gb);
1532
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
1533
                if (level == -128) {
1534
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
1535
                } else if (level == 0) {
1536
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
1537
                }
1538
                i += run;
1539
                j = scantable[i];
1540
                if(level<0){
1541
                    level= -level;
1542
                    level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1543
                    level= (level-1)|1;
1544
                    level= -level;
1545
                }else{
1546
                    level= ((level*2+1)*qscale*quant_matrix[j])>>4;
1547
                    level= (level-1)|1;
1548
                }
1549 de6d9b64 Fabrice Bellard
            }
1550 a0201736 Michael Niedermayer
            if (i > 63){
1551 9b879566 Michel Bardiaux
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1552 a0201736 Michael Niedermayer
                return -1;
1553
            }
1554
1555
            block[j] = level;
1556 de6d9b64 Fabrice Bellard
        }
1557 a0201736 Michael Niedermayer
        CLOSE_READER(re, &s->gb);
1558 de6d9b64 Fabrice Bellard
    }
1559 a0201736 Michael Niedermayer
    s->block_last_index[n] = i;
1560 de6d9b64 Fabrice Bellard
    return 0;
1561
}
1562
1563
/* Also does unquantization here, since I will never support mpeg2
1564
   encoding */
1565 3729c912 Michael Niedermayer
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, 
1566
                               DCTELEM *block, 
1567
                               int n)
1568 de6d9b64 Fabrice Bellard
{
1569
    int level, i, j, run;
1570
    RLTable *rl = &rl_mpeg1;
1571 0c1a9eda Zdenek Kabelac
    uint8_t * const scantable= s->intra_scantable.permutated;
1572
    const uint16_t *quant_matrix;
1573 3729c912 Michael Niedermayer
    const int qscale= s->qscale;
1574 de6d9b64 Fabrice Bellard
    int mismatch;
1575
1576
    mismatch = 1;
1577
1578
    {
1579 8db1a1dd Michael Niedermayer
        int v;
1580
        OPEN_READER(re, &s->gb);
1581 3729c912 Michael Niedermayer
        i = -1;
1582 8db1a1dd Michael Niedermayer
        if (n < 4)
1583 3729c912 Michael Niedermayer
            quant_matrix = s->inter_matrix;
1584 de6d9b64 Fabrice Bellard
        else
1585 3729c912 Michael Niedermayer
            quant_matrix = s->chroma_inter_matrix;
1586 8db1a1dd Michael Niedermayer
1587 de6d9b64 Fabrice Bellard
        /* special case for the first coef. no need to add a second vlc table */
1588 8db1a1dd Michael Niedermayer
        UPDATE_CACHE(re, &s->gb);
1589
        v= SHOW_UBITS(re, &s->gb, 2);
1590 de6d9b64 Fabrice Bellard
        if (v & 2) {
1591 3729c912 Michael Niedermayer
            LAST_SKIP_BITS(re, &s->gb, 2);
1592
            level= (3*qscale*quant_matrix[0])>>5;
1593
            if(v&1)
1594
                level= -level;
1595
            block[0] = level;
1596
            mismatch ^= level;
1597
            i++;
1598 de6d9b64 Fabrice Bellard
        }
1599
1600 3729c912 Michael Niedermayer
        /* now quantify & encode AC coefs */
1601
        for(;;) {
1602
            UPDATE_CACHE(re, &s->gb);
1603
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1604
            
1605
            if(level == 127){
1606
                break;
1607
            } else if(level != 0) {
1608
                i += run;
1609
                j = scantable[i];
1610
                level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1611
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1612
                LAST_SKIP_BITS(re, &s->gb, 1);
1613
            } else {
1614
                /* escape */
1615
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1616
                UPDATE_CACHE(re, &s->gb);
1617
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1618
1619
                i += run;
1620
                j = scantable[i];
1621
                if(level<0){
1622
                    level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
1623
                    level= -level;
1624
                }else{
1625
                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;
1626
                }
1627
            }
1628
            if (i > 63){
1629 9b879566 Michel Bardiaux
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1630 3729c912 Michael Niedermayer
                return -1;
1631
            }
1632
            
1633
            mismatch ^= level;
1634
            block[j] = level;
1635 25ed7f92 Fabrice Bellard
        }
1636 3729c912 Michael Niedermayer
        CLOSE_READER(re, &s->gb);
1637 de6d9b64 Fabrice Bellard
    }
1638
    block[63] ^= (mismatch & 1);
1639 3729c912 Michael Niedermayer
    
1640 de6d9b64 Fabrice Bellard
    s->block_last_index[n] = i;
1641
    return 0;
1642
}
1643
1644 3729c912 Michael Niedermayer
static inline int mpeg2_decode_block_intra(MpegEncContext *s, 
1645
                               DCTELEM *block, 
1646
                               int n)
1647 de6d9b64 Fabrice Bellard
{
1648
    int level, dc, diff, i, j, run;
1649 3729c912 Michael Niedermayer
    int component;
1650 de6d9b64 Fabrice Bellard
    RLTable *rl;
1651 0c1a9eda Zdenek Kabelac
    uint8_t * const scantable= s->intra_scantable.permutated;
1652
    const uint16_t *quant_matrix;
1653 3729c912 Michael Niedermayer
    const int qscale= s->qscale;
1654 de6d9b64 Fabrice Bellard
    int mismatch;
1655
1656
    /* DC coef */
1657 3729c912 Michael Niedermayer
    if (n < 4){
1658
        quant_matrix = s->intra_matrix;
1659
        component = 0; 
1660
    }else{
1661
        quant_matrix = s->chroma_intra_matrix;
1662
        component = n - 3;
1663
    }
1664 c3bf0288 Michael Niedermayer
    diff = decode_dc(&s->gb, component);
1665 de6d9b64 Fabrice Bellard
    if (diff >= 0xffff)
1666
        return -1;
1667
    dc = s->last_dc[component];
1668
    dc += diff;
1669
    s->last_dc[component] = dc;
1670
    block[0] = dc << (3 - s->intra_dc_precision);
1671
    dprintf("dc=%d\n", block[0]);
1672 d753173a Fabrice Bellard
    mismatch = block[0] ^ 1;
1673 3729c912 Michael Niedermayer
    i = 0;
1674 de6d9b64 Fabrice Bellard
    if (s->intra_vlc_format)
1675
        rl = &rl_mpeg2;
1676
    else
1677
        rl = &rl_mpeg1;
1678 25ed7f92 Fabrice Bellard
1679 3729c912 Michael Niedermayer
    {
1680
        OPEN_READER(re, &s->gb);    
1681
        /* now quantify & encode AC coefs */
1682
        for(;;) {
1683
            UPDATE_CACHE(re, &s->gb);
1684
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
1685
            
1686
            if(level == 127){
1687
                break;
1688
            } else if(level != 0) {
1689
                i += run;
1690
                j = scantable[i];
1691
                level= (level*qscale*quant_matrix[j])>>4;
1692
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1693
                LAST_SKIP_BITS(re, &s->gb, 1);
1694
            } else {
1695
                /* escape */
1696
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1697
                UPDATE_CACHE(re, &s->gb);
1698
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1699
                i += run;
1700
                j = scantable[i];
1701
                if(level<0){
1702
                    level= (-level*qscale*quant_matrix[j])>>4;
1703
                    level= -level;
1704
                }else{
1705
                    level= (level*qscale*quant_matrix[j])>>4;
1706
                }
1707
            }
1708
            if (i > 63){
1709 9b879566 Michel Bardiaux
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1710 3729c912 Michael Niedermayer
                return -1;
1711
            }
1712
            
1713
            mismatch^= level;
1714
            block[j] = level;
1715 9ac7ecd6 Michael Niedermayer
        }
1716 3729c912 Michael Niedermayer
        CLOSE_READER(re, &s->gb);
1717 de6d9b64 Fabrice Bellard
    }
1718 3729c912 Michael Niedermayer
    block[63]^= mismatch&1;
1719
    
1720 de6d9b64 Fabrice Bellard
    s->block_last_index[n] = i;
1721
    return 0;
1722
}
1723
1724
typedef struct Mpeg1Context {
1725
    MpegEncContext mpeg_enc_ctx;
1726
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1727 1cb0edb4 Juanjo
    int repeat_field; /* true if we must repeat the field */
1728 fa384dcc Michael Niedermayer
    AVPanScan pan_scan; /** some temporary storage for the panscan */
1729 de6d9b64 Fabrice Bellard
} Mpeg1Context;
1730
1731
static int mpeg_decode_init(AVCodecContext *avctx)
1732
{
1733
    Mpeg1Context *s = avctx->priv_data;
1734 8f8402e4 Michael Niedermayer
    
1735 94aec31f Michael Niedermayer
    s->mpeg_enc_ctx.flags= avctx->flags;
1736 8f8402e4 Michael Niedermayer
    common_init(&s->mpeg_enc_ctx);
1737 c3bf0288 Michael Niedermayer
    init_vlcs();
1738 de6d9b64 Fabrice Bellard
1739
    s->mpeg_enc_ctx_allocated = 0;
1740
    s->mpeg_enc_ctx.picture_number = 0;
1741 1cb0edb4 Juanjo
    s->repeat_field = 0;
1742 d7e9533a Michael Niedermayer
    s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1743 de6d9b64 Fabrice Bellard
    return 0;
1744
}
1745
1746
/* return the 8 bit start code value and update the search
1747
   state. Return -1 if no start code found */
1748 80097bbf Michael Niedermayer
static int find_start_code(uint8_t **pbuf_ptr, uint8_t *buf_end)
1749 de6d9b64 Fabrice Bellard
{
1750 0c1a9eda Zdenek Kabelac
    uint8_t *buf_ptr;
1751 80097bbf Michael Niedermayer
    unsigned int state=0xFFFFFFFF, v;
1752 de6d9b64 Fabrice Bellard
    int val;
1753
1754
    buf_ptr = *pbuf_ptr;
1755
    while (buf_ptr < buf_end) {
1756
        v = *buf_ptr++;
1757
        if (state == 0x000001) {
1758
            state = ((state << 8) | v) & 0xffffff;
1759
            val = state;
1760
            goto found;
1761
        }
1762
        state = ((state << 8) | v) & 0xffffff;
1763
    }
1764
    val = -1;
1765
 found:
1766
    *pbuf_ptr = buf_ptr;
1767
    return val;
1768
}
1769
1770
static int mpeg1_decode_picture(AVCodecContext *avctx, 
1771 0c1a9eda Zdenek Kabelac
                                uint8_t *buf, int buf_size)
1772 de6d9b64 Fabrice Bellard
{
1773
    Mpeg1Context *s1 = avctx->priv_data;
1774
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1775 d60a8f85 Michael Niedermayer
    int ref, f_code, vbv_delay;
1776 de6d9b64 Fabrice Bellard
1777 68f593b4 Michael Niedermayer
    init_get_bits(&s->gb, buf, buf_size*8);
1778 de6d9b64 Fabrice Bellard
1779
    ref = get_bits(&s->gb, 10); /* temporal ref */
1780
    s->pict_type = get_bits(&s->gb, 3);
1781 b9ecd1ee Fabrice Bellard
    dprintf("pict_type=%d number=%d\n", s->pict_type, s->picture_number);
1782 58bfafbe Michael Niedermayer
1783 d60a8f85 Michael Niedermayer
    vbv_delay= get_bits(&s->gb, 16);
1784 de6d9b64 Fabrice Bellard
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1785 612476ef Arpi
        s->full_pel[0] = get_bits1(&s->gb);
1786 de6d9b64 Fabrice Bellard
        f_code = get_bits(&s->gb, 3);
1787
        if (f_code == 0)
1788
            return -1;
1789
        s->mpeg_f_code[0][0] = f_code;
1790
        s->mpeg_f_code[0][1] = f_code;
1791
    }
1792
    if (s->pict_type == B_TYPE) {
1793 612476ef Arpi
        s->full_pel[1] = get_bits1(&s->gb);
1794 de6d9b64 Fabrice Bellard
        f_code = get_bits(&s->gb, 3);
1795
        if (f_code == 0)
1796
            return -1;
1797
        s->mpeg_f_code[1][0] = f_code;
1798
        s->mpeg_f_code[1][1] = f_code;
1799
    }
1800 1e491e29 Michael Niedermayer
    s->current_picture.pict_type= s->pict_type;
1801
    s->current_picture.key_frame= s->pict_type == I_TYPE;
1802 d9cb5429 Michael Niedermayer
    
1803 de6d9b64 Fabrice Bellard
    s->y_dc_scale = 8;
1804
    s->c_dc_scale = 8;
1805
    s->first_slice = 1;
1806
    return 0;
1807
}
1808
1809
static void mpeg_decode_sequence_extension(MpegEncContext *s)
1810
{
1811
    int horiz_size_ext, vert_size_ext;
1812 945f15b7 Michael Niedermayer
    int bit_rate_ext, vbv_buf_ext;
1813 de6d9b64 Fabrice Bellard
    int frame_rate_ext_n, frame_rate_ext_d;
1814 029911d1 Michael Niedermayer
    int level, profile;
1815 de6d9b64 Fabrice Bellard
1816 029911d1 Michael Niedermayer
    skip_bits(&s->gb, 1); /* profil and level esc*/
1817
    profile= get_bits(&s->gb, 3);
1818
    level= get_bits(&s->gb, 4);
1819 1cb0edb4 Juanjo
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1820 612476ef Arpi
    skip_bits(&s->gb, 2); /* chroma_format */
1821 de6d9b64 Fabrice Bellard
    horiz_size_ext = get_bits(&s->gb, 2);
1822
    vert_size_ext = get_bits(&s->gb, 2);
1823
    s->width |= (horiz_size_ext << 12);
1824
    s->height |= (vert_size_ext << 12);
1825
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1826
    s->bit_rate = ((s->bit_rate / 400) | (bit_rate_ext << 12)) * 400;
1827 612476ef Arpi
    skip_bits1(&s->gb); /* marker */
1828 0368c72d Michael Niedermayer
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1829 e0560448 Michael Niedermayer
1830 945f15b7 Michael Niedermayer
    s->low_delay = get_bits1(&s->gb);
1831 e0560448 Michael Niedermayer
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1832
1833 de6d9b64 Fabrice Bellard
    frame_rate_ext_n = get_bits(&s->gb, 2);
1834
    frame_rate_ext_d = get_bits(&s->gb, 5);
1835 14bea432 Michael Niedermayer
    av_reduce(
1836
        &s->avctx->frame_rate, 
1837
        &s->avctx->frame_rate_base, 
1838
        frame_rate_tab[s->frame_rate_index] * (frame_rate_ext_n+1),
1839
        MPEG1_FRAME_RATE_BASE * (frame_rate_ext_d+1),
1840
        1<<30);
1841
1842 de6d9b64 Fabrice Bellard
    dprintf("sequence extension\n");
1843 029911d1 Michael Niedermayer
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1844 fb4a4a56 Fabrice Bellard
    s->avctx->sub_id = 2; /* indicates mpeg2 found */
1845 945f15b7 Michael Niedermayer
1846 5ff85f1d Michael Niedermayer
    if(s->aspect_ratio_info <= 1)
1847
        s->avctx->sample_aspect_ratio= mpeg2_aspect[s->aspect_ratio_info];
1848
    else{
1849
        s->avctx->sample_aspect_ratio= 
1850
            av_div_q(
1851
                mpeg2_aspect[s->aspect_ratio_info], 
1852
                (AVRational){s->width, s->height}
1853
            );
1854
    }
1855 029911d1 Michael Niedermayer
    
1856
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1857 0368c72d Michael Niedermayer
        av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n", 
1858
               profile, level, s->avctx->rc_buffer_size, s->bit_rate);
1859 de6d9b64 Fabrice Bellard
}
1860
1861 fa384dcc Michael Niedermayer
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1862
{
1863
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1864
    int color_description, w, h;
1865
1866
    skip_bits(&s->gb, 3); /* video format */
1867
    color_description= get_bits1(&s->gb);
1868
    if(color_description){
1869
        skip_bits(&s->gb, 8); /* color primaries */
1870
        skip_bits(&s->gb, 8); /* transfer_characteristics */
1871
        skip_bits(&s->gb, 8); /* matrix_coefficients */
1872
    }
1873
    w= get_bits(&s->gb, 14);
1874
    skip_bits(&s->gb, 1); //marker
1875
    h= get_bits(&s->gb, 14);
1876
    skip_bits(&s->gb, 1); //marker
1877
    
1878
    s1->pan_scan.width= 16*w;
1879
    s1->pan_scan.height=16*h;
1880
1881 5ff85f1d Michael Niedermayer
    if(s->aspect_ratio_info > 1)
1882
        s->avctx->sample_aspect_ratio= 
1883
            av_div_q(
1884
                mpeg2_aspect[s->aspect_ratio_info], 
1885
                (AVRational){w, h}
1886
            );
1887 fa384dcc Michael Niedermayer
    
1888
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1889 9b879566 Michel Bardiaux
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1890 fa384dcc Michael Niedermayer
}
1891
1892
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1893
{
1894
    MpegEncContext *s= &s1->mpeg_enc_ctx;
1895
    int i;
1896
1897
    for(i=0; i<1; i++){ //FIXME count
1898
        s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1899
        skip_bits(&s->gb, 1); //marker
1900
        s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1901
        skip_bits(&s->gb, 1); //marker
1902
    }
1903
   
1904
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1905 9b879566 Michel Bardiaux
        av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n", 
1906 fa384dcc Michael Niedermayer
            s1->pan_scan.position[0][0], s1->pan_scan.position[0][1], 
1907
            s1->pan_scan.position[1][0], s1->pan_scan.position[1][1], 
1908
            s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1909
        );
1910
}
1911
1912 de6d9b64 Fabrice Bellard
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1913
{
1914 60832448 Fabrice Bellard
    int i, v, j;
1915 de6d9b64 Fabrice Bellard
1916 25ed7f92 Fabrice Bellard
    dprintf("matrix extension\n");
1917
1918 612476ef Arpi
    if (get_bits1(&s->gb)) {
1919 de6d9b64 Fabrice Bellard
        for(i=0;i<64;i++) {
1920
            v = get_bits(&s->gb, 8);
1921 b0368839 Michael Niedermayer
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1922 60832448 Fabrice Bellard
            s->intra_matrix[j] = v;
1923
            s->chroma_intra_matrix[j] = v;
1924 de6d9b64 Fabrice Bellard
        }
1925
    }
1926 612476ef Arpi
    if (get_bits1(&s->gb)) {
1927 de6d9b64 Fabrice Bellard
        for(i=0;i<64;i++) {
1928
            v = get_bits(&s->gb, 8);
1929 b0368839 Michael Niedermayer
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1930 d7e9533a Michael Niedermayer
            s->inter_matrix[j] = v;
1931
            s->chroma_inter_matrix[j] = v;
1932 de6d9b64 Fabrice Bellard
        }
1933
    }
1934 612476ef Arpi
    if (get_bits1(&s->gb)) {
1935 de6d9b64 Fabrice Bellard
        for(i=0;i<64;i++) {
1936
            v = get_bits(&s->gb, 8);
1937 b0368839 Michael Niedermayer
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1938 60832448 Fabrice Bellard
            s->chroma_intra_matrix[j] = v;
1939 de6d9b64 Fabrice Bellard
        }
1940
    }
1941 612476ef Arpi
    if (get_bits1(&s->gb)) {
1942 de6d9b64 Fabrice Bellard
        for(i=0;i<64;i++) {
1943
            v = get_bits(&s->gb, 8);
1944 b0368839 Michael Niedermayer
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1945 d7e9533a Michael Niedermayer
            s->chroma_inter_matrix[j] = v;
1946 de6d9b64 Fabrice Bellard
        }
1947
    }
1948
}
1949
1950
static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1951
{
1952
    s->full_pel[0] = s->full_pel[1] = 0;
1953
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1954
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1955
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1956
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1957
    s->intra_dc_precision = get_bits(&s->gb, 2);
1958
    s->picture_structure = get_bits(&s->gb, 2);
1959 612476ef Arpi
    s->top_field_first = get_bits1(&s->gb);
1960
    s->frame_pred_frame_dct = get_bits1(&s->gb);
1961
    s->concealment_motion_vectors = get_bits1(&s->gb);
1962
    s->q_scale_type = get_bits1(&s->gb);
1963
    s->intra_vlc_format = get_bits1(&s->gb);
1964
    s->alternate_scan = get_bits1(&s->gb);
1965
    s->repeat_first_field = get_bits1(&s->gb);
1966
    s->chroma_420_type = get_bits1(&s->gb);
1967
    s->progressive_frame = get_bits1(&s->gb);
1968 bb198e19 Michael Niedermayer
1969 dfb476cb Michael Niedermayer
    if(s->picture_structure == PICT_FRAME)
1970
        s->first_field=0;
1971
    else{
1972
        s->first_field ^= 1;
1973 7bc9090a Michael Niedermayer
        memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1974 dfb476cb Michael Niedermayer
    }
1975
    
1976 acf44abb Michael Niedermayer
    if(s->alternate_scan){
1977 3d2e8cce Michael Niedermayer
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
1978
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
1979 acf44abb Michael Niedermayer
    }else{
1980 3d2e8cce Michael Niedermayer
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
1981
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
1982 acf44abb Michael Niedermayer
    }
1983
    
1984 de6d9b64 Fabrice Bellard
    /* composite display not parsed */
1985 1cb0edb4 Juanjo
    dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
1986 25ed7f92 Fabrice Bellard
    dprintf("picture_structure=%d\n", s->picture_structure);
1987 e0a3d744 Juanjo
    dprintf("top field first=%d\n", s->top_field_first);
1988
    dprintf("repeat first field=%d\n", s->repeat_first_field);
1989 de6d9b64 Fabrice Bellard
    dprintf("conceal=%d\n", s->concealment_motion_vectors);
1990 25ed7f92 Fabrice Bellard
    dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
1991
    dprintf("alternate_scan=%d\n", s->alternate_scan);
1992 de6d9b64 Fabrice Bellard
    dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1993 1cb0edb4 Juanjo
    dprintf("progressive_frame=%d\n", s->progressive_frame);
1994 de6d9b64 Fabrice Bellard
}
1995
1996
static void mpeg_decode_extension(AVCodecContext *avctx, 
1997 0c1a9eda Zdenek Kabelac
                                  uint8_t *buf, int buf_size)
1998 de6d9b64 Fabrice Bellard
{
1999
    Mpeg1Context *s1 = avctx->priv_data;
2000
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2001
    int ext_type;
2002
2003 68f593b4 Michael Niedermayer
    init_get_bits(&s->gb, buf, buf_size*8);
2004 de6d9b64 Fabrice Bellard
    
2005
    ext_type = get_bits(&s->gb, 4);
2006
    switch(ext_type) {
2007
    case 0x1:
2008
        mpeg_decode_sequence_extension(s);
2009
        break;
2010 fa384dcc Michael Niedermayer
    case 0x2:
2011
        mpeg_decode_sequence_display_extension(s1);
2012
        break;
2013 de6d9b64 Fabrice Bellard
    case 0x3:
2014
        mpeg_decode_quant_matrix_extension(s);
2015
        break;
2016 fa384dcc Michael Niedermayer
    case 0x7:
2017
        mpeg_decode_picture_display_extension(s1);
2018
        break;
2019 de6d9b64 Fabrice Bellard
    case 0x8:
2020
        mpeg_decode_picture_coding_extension(s);
2021
        break;
2022
    }
2023
}
2024
2025 a579db0c Ivan Kalvachev
static void exchange_uv(MpegEncContext *s){
2026
short * tmp;
2027
2028
    tmp = s->pblocks[4];
2029
    s->pblocks[4] = s->pblocks[5];
2030
    s->pblocks[5] = tmp;
2031 ff862be5 Michael Niedermayer
}
2032
2033 86f85dca Michael Niedermayer
#define DECODE_SLICE_FATAL_ERROR -2
2034
#define DECODE_SLICE_ERROR -1
2035
#define DECODE_SLICE_OK 0
2036
2037
/**
2038
 * decodes a slice.
2039
 * @return DECODE_SLICE_FATAL_ERROR if a non recoverable error occured<br>
2040
 *         DECODE_SLICE_ERROR if the slice is damaged<br>
2041
 *         DECODE_SLICE_OK if this slice is ok<br>
2042
 */
2043 de6d9b64 Fabrice Bellard
static int mpeg_decode_slice(AVCodecContext *avctx, 
2044 492cd3a9 Michael Niedermayer
                              AVFrame *pict,
2045 de6d9b64 Fabrice Bellard
                              int start_code,
2046 80097bbf Michael Niedermayer
                              uint8_t **buf, int buf_size)
2047 de6d9b64 Fabrice Bellard
{
2048
    Mpeg1Context *s1 = avctx->priv_data;
2049
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2050
    int ret;
2051 dfb476cb Michael Niedermayer
    const int field_pic= s->picture_structure != PICT_FRAME;
2052 de6d9b64 Fabrice Bellard
2053 db6e7795 Michael Niedermayer
    s->resync_mb_x= s->mb_x = 
2054
    s->resync_mb_y= s->mb_y = -1;
2055
    
2056 de6d9b64 Fabrice Bellard
    start_code = (start_code - 1) & 0xff;
2057 9ac7ecd6 Michael Niedermayer
    if (start_code >= s->mb_height){
2058 9b879566 Michel Bardiaux
        av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", start_code, s->mb_height);
2059 db6e7795 Michael Niedermayer
        return -1;
2060 9ac7ecd6 Michael Niedermayer
    }
2061 9b8709d1 Michael Niedermayer
    
2062
    ff_mpeg1_clean_buffers(s);
2063 7bc9090a Michael Niedermayer
    s->interlaced_dct = 0;
2064 dfb476cb Michael Niedermayer
        
2065 de6d9b64 Fabrice Bellard
    /* start frame decoding */
2066 b536d0aa Michael Niedermayer
    if (s->first_slice) {
2067
      if(s->first_field || s->picture_structure==PICT_FRAME){
2068 d6db1c9c Michael Niedermayer
        if(MPV_frame_start(s, avctx) < 0)
2069 86f85dca Michael Niedermayer
            return DECODE_SLICE_FATAL_ERROR;
2070 7bc9090a Michael Niedermayer
2071
        ff_er_frame_start(s);
2072
2073 2ec23b6d Michael Niedermayer
        /* first check if we must repeat the frame */
2074 9ee2c20e Fabrice Bellard
        s->current_picture_ptr->repeat_pict = 0;
2075 2ec23b6d Michael Niedermayer
        if (s->repeat_first_field) {
2076
            if (s->progressive_sequence) {
2077
                if (s->top_field_first)
2078 9ee2c20e Fabrice Bellard
                    s->current_picture_ptr->repeat_pict = 4;
2079 2ec23b6d Michael Niedermayer
                else
2080 9ee2c20e Fabrice Bellard
                    s->current_picture_ptr->repeat_pict = 2;
2081 2ec23b6d Michael Niedermayer
            } else if (s->progressive_frame) {
2082 9ee2c20e Fabrice Bellard
                s->current_picture_ptr->repeat_pict = 1;
2083 2ec23b6d Michael Niedermayer
            }
2084
        }         
2085 fa384dcc Michael Niedermayer
2086
        *s->current_picture_ptr->pan_scan= s1->pan_scan;
2087 b536d0aa Michael Niedermayer
      }else{ //second field
2088
            int i;
2089 37b787f1 Michael Niedermayer
            
2090
            if(!s->current_picture_ptr){
2091 9b879566 Michel Bardiaux
                av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
2092 37b787f1 Michael Niedermayer
                return -1;
2093
            }
2094
            
2095 b536d0aa Michael Niedermayer
            for(i=0; i<4; i++){
2096
                s->current_picture.data[i] = s->current_picture_ptr->data[i];
2097
                if(s->picture_structure == PICT_BOTTOM_FIELD){
2098
                    s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
2099
                } 
2100
            }
2101
      }
2102 2e7b4c84 Ivan Kalvachev
#ifdef HAVE_XVMC
2103
// MPV_frame_start will call this function too,
2104
// but we need to call it on every field
2105
      if(s->avctx->xvmc_acceleration)
2106
         XVMC_field_start(s,avctx);
2107
#endif
2108
    }//fi(s->first_slice)
2109 de6d9b64 Fabrice Bellard
2110 80097bbf Michael Niedermayer
    init_get_bits(&s->gb, *buf, buf_size*8);
2111 de6d9b64 Fabrice Bellard
2112 0ee50938 Fabrice Bellard
    s->qscale = get_qscale(s);
2113 a4337a51 Michael Niedermayer
    if (s->first_slice && (s->first_field || s->picture_structure==PICT_FRAME)) {
2114
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2115 bb198e19 Michael Niedermayer
             av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%2d%2d%2d%2d %s %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n", 
2116 a4337a51 Michael Niedermayer
                 s->qscale, s->mpeg_f_code[0][0],s->mpeg_f_code[0][1],s->mpeg_f_code[1][0],s->mpeg_f_code[1][1],
2117
                 s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")), 
2118 bb198e19 Michael Niedermayer
                 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"", 
2119 a4337a51 Michael Niedermayer
                 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
2120
                 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
2121
        }
2122
    }
2123
2124
    s->first_slice = 0;
2125 7bc9090a Michael Niedermayer
    if(s->qscale == 0){
2126 9b879566 Michel Bardiaux
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
2127 db6e7795 Michael Niedermayer
        return -1;
2128 7bc9090a Michael Niedermayer
    }
2129
    
2130 de6d9b64 Fabrice Bellard
    /* extra slice info */
2131 612476ef Arpi
    while (get_bits1(&s->gb) != 0) {
2132
        skip_bits(&s->gb, 8);
2133 de6d9b64 Fabrice Bellard
    }
2134 7bc9090a Michael Niedermayer
    
2135 ce5b7c5e Michael Niedermayer
    s->mb_x=0;
2136 7bc9090a Michael Niedermayer
2137 ce5b7c5e Michael Niedermayer
    for(;;) {
2138
        int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2139 7bc9090a Michael Niedermayer
        if (code < 0){
2140 9b879566 Michel Bardiaux
            av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
2141 db6e7795 Michael Niedermayer
            return -1;
2142 7bc9090a Michael Niedermayer
        }
2143 ce5b7c5e Michael Niedermayer
        if (code >= 33) {
2144
            if (code == 33) {
2145
                s->mb_x += 33;
2146
            }
2147
            /* otherwise, stuffing, nothing to do */
2148
        } else {
2149
            s->mb_x += code;
2150
            break;
2151
        }
2152
    }
2153 9b8709d1 Michael Niedermayer
    
2154 7bc9090a Michael Niedermayer
    s->resync_mb_x= s->mb_x;
2155
    s->resync_mb_y= s->mb_y = start_code;
2156 9b8709d1 Michael Niedermayer
    s->mb_skip_run= 0;
2157 7d1c3fc1 Michael Niedermayer
    ff_init_block_index(s);
2158 ce5b7c5e Michael Niedermayer
2159 de6d9b64 Fabrice Bellard
    for(;;) {
2160 a579db0c Ivan Kalvachev
#ifdef HAVE_XVMC
2161
        //one 1 we memcpy blocks in xvmcvideo
2162
        if(s->avctx->xvmc_acceleration > 1)
2163
            XVMC_init_block(s);//set s->block
2164
#endif
2165
2166 eb4b3dd3 Zdenek Kabelac
        s->dsp.clear_blocks(s->block[0]);
2167 7bc9090a Michael Niedermayer
2168 b7ec19d3 Fabrice Bellard
        ret = mpeg_decode_mb(s, s->block);
2169 332f9ac4 Michael Niedermayer
        s->chroma_qscale= s->qscale;
2170 7bc9090a Michael Niedermayer
2171 de6d9b64 Fabrice Bellard
        dprintf("ret=%d\n", ret);
2172
        if (ret < 0)
2173
            return -1;
2174 8d7ec294 Wolfgang Hesseler
2175 31b1ec5d Michael Niedermayer
        if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
2176
            const int wrap = field_pic ? 2*s->block_wrap[0] : s->block_wrap[0];
2177
            int xy = s->mb_x*2 + 1 + (s->mb_y*2 +1)*wrap;
2178 fad05f52 Wolfgang Hesseler
            int motion_for_top_x, motion_for_top_y, motion_back_top_x, motion_back_top_y;
2179
            int motion_for_bottom_x, motion_for_bottom_y, motion_back_bottom_x, motion_back_bottom_y;
2180 31b1ec5d Michael Niedermayer
            if(field_pic && !s->first_field)
2181
                xy += wrap/2;
2182
2183 db6e7795 Michael Niedermayer
            if (s->mb_intra) {
2184 fad05f52 Wolfgang Hesseler
                motion_for_top_x = motion_for_top_y = motion_back_top_x = motion_back_top_y =
2185
                motion_for_bottom_x = motion_for_bottom_y = motion_back_bottom_x = motion_back_bottom_y = 0;
2186 8d7ec294 Wolfgang Hesseler
            }else if (s->mv_type == MV_TYPE_16X16){
2187 fad05f52 Wolfgang Hesseler
                motion_for_top_x = motion_for_bottom_x = s->mv[0][0][0];
2188
                motion_for_top_y = motion_for_bottom_y = s->mv[0][0][1];
2189
                motion_back_top_x = motion_back_bottom_x = s->mv[1][0][0];
2190
                motion_back_top_y = motion_back_bottom_y = s->mv[1][0][1];
2191 8d7ec294 Wolfgang Hesseler
            } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
2192 fad05f52 Wolfgang Hesseler
                motion_for_top_x = s->mv[0][0][0];
2193
                motion_for_top_y = s->mv[0][0][1];
2194
                motion_for_bottom_x = s->mv[0][1][0];
2195
                motion_for_bottom_y = s->mv[0][1][1];
2196
                motion_back_top_x = s->mv[1][0][0];
2197
                motion_back_top_y = s->mv[1][0][1];
2198
                motion_back_bottom_x = s->mv[1][1][0];
2199
                motion_back_bottom_y = s->mv[1][1][1];
2200 8d7ec294 Wolfgang Hesseler
            }
2201
2202 fad05f52 Wolfgang Hesseler
            s->current_picture.motion_val[0][xy][0] = motion_for_top_x;
2203
            s->current_picture.motion_val[0][xy][1] = motion_for_top_y;
2204
            s->current_picture.motion_val[0][xy + 1][0] = motion_for_top_x;
2205
            s->current_picture.motion_val[0][xy + 1][1] = motion_for_top_y;
2206
            s->current_picture.motion_val[0][xy + wrap][0] = motion_for_bottom_x;
2207
            s->current_picture.motion_val[0][xy + wrap][1] = motion_for_bottom_y;
2208
            s->current_picture.motion_val[0][xy + 1 + wrap][0] = motion_for_bottom_x;
2209
            s->current_picture.motion_val[0][xy + 1 + wrap][1] = motion_for_bottom_y;
2210 8d7ec294 Wolfgang Hesseler
2211
            if(s->pict_type != B_TYPE){
2212 fad05f52 Wolfgang Hesseler
                motion_back_top_x = motion_back_top_y = motion_back_bottom_x = motion_back_bottom_y = 0;
2213 7bc9090a Michael Niedermayer
            }
2214 8d7ec294 Wolfgang Hesseler
2215 fad05f52 Wolfgang Hesseler
            s->current_picture.motion_val[1][xy][0] = motion_back_top_x;
2216
            s->current_picture.motion_val[1][xy][1] = motion_back_top_y;
2217
            s->current_picture.motion_val[1][xy + 1][0] = motion_back_top_x;
2218
            s->current_picture.motion_val[1][xy + 1][1] = motion_back_top_y;
2219
            s->current_picture.motion_val[1][xy + wrap][0] = motion_back_bottom_x;
2220
            s->current_picture.motion_val[1][xy + wrap][1] = motion_back_bottom_y;
2221
            s->current_picture.motion_val[1][xy + 1 + wrap][0] = motion_back_bottom_x;
2222
            s->current_picture.motion_val[1][xy + 1 + wrap][1] = motion_back_bottom_y;
2223 7bc9090a Michael Niedermayer
        }
2224 8d7ec294 Wolfgang Hesseler
2225 7d1c3fc1 Michael Niedermayer
        s->dest[0] += 16;
2226
        s->dest[1] += 8;
2227
        s->dest[2] += 8;
2228 ce5b7c5e Michael Niedermayer
2229 7d1c3fc1 Michael Niedermayer
        MPV_decode_mb(s, s->block);
2230
        
2231 ce5b7c5e Michael Niedermayer
        if (++s->mb_x >= s->mb_width) {
2232 ff862be5 Michael Niedermayer
2233 3bb07d61 Michael Niedermayer
            ff_draw_horiz_band(s, 16*s->mb_y, 16);
2234 ce5b7c5e Michael Niedermayer
2235
            s->mb_x = 0;
2236
            s->mb_y++;
2237 cf713bb8 Michael Niedermayer
2238
            if(s->mb_y<<field_pic >= s->mb_height){
2239
                int left= s->gb.size_in_bits - get_bits_count(&s->gb);
2240
2241
                if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)))
2242
                   || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
2243 9b879566 Michel Bardiaux
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d\n", left);
2244 cf713bb8 Michael Niedermayer
                    return -1;
2245
                }else
2246
                    goto eos;
2247
            }
2248 7d1c3fc1 Michael Niedermayer
            
2249
            ff_init_block_index(s);
2250 ce5b7c5e Michael Niedermayer
        }
2251
2252
        /* skip mb handling */
2253 9b8709d1 Michael Niedermayer
        if (s->mb_skip_run == -1) {
2254 ce5b7c5e Michael Niedermayer
            /* read again increment */
2255 9b8709d1 Michael Niedermayer
            s->mb_skip_run = 0;
2256 ce5b7c5e Michael Niedermayer
            for(;;) {
2257
                int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2258 7bc9090a Michael Niedermayer
                if (code < 0){
2259 9b879566 Michel Bardiaux
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
2260 9c00c3af Michael Niedermayer
                    return -1;
2261 7bc9090a Michael Niedermayer
                }
2262 ce5b7c5e Michael Niedermayer
                if (code >= 33) {
2263
                    if (code == 33) {
2264 9b8709d1 Michael Niedermayer
                        s->mb_skip_run += 33;
2265 9c00c3af Michael Niedermayer
                    }else if(code == 35){
2266
                        if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2267 9b879566 Michel Bardiaux
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
2268 9c00c3af Michael Niedermayer
                            return -1;
2269
                        }
2270
                        goto eos; /* end of slice */
2271 ce5b7c5e Michael Niedermayer
                    }
2272
                    /* otherwise, stuffing, nothing to do */
2273
                } else {
2274 9b8709d1 Michael Niedermayer
                    s->mb_skip_run += code;
2275 ce5b7c5e Michael Niedermayer
                    break;
2276
                }
2277
            }
2278
        }
2279 de6d9b64 Fabrice Bellard
    }
2280 db6e7795 Michael Niedermayer
eos: // end of slice
2281
    *buf += get_bits_count(&s->gb)/8 - 1;
2282 7bc9090a Michael Niedermayer
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2283 db6e7795 Michael Niedermayer
    return 0;
2284
}
2285 7bc9090a Michael Niedermayer
2286 db6e7795 Michael Niedermayer
/**
2287
 * handles slice ends.
2288
 * @return 1 if it seems to be the last slice of 
2289
 */
2290
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2291
{
2292
    Mpeg1Context *s1 = avctx->priv_data;
2293
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2294
       
2295 36b58e85 Roman Shaposhnik
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2296 855127bc Fabrice Bellard
        return 0;
2297
2298 2e7b4c84 Ivan Kalvachev
#ifdef HAVE_XVMC
2299
    if(s->avctx->xvmc_acceleration)
2300
        XVMC_field_end(s);
2301
#endif
2302 de6d9b64 Fabrice Bellard
    /* end of slice reached */
2303 db6e7795 Michael Niedermayer
    if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2304 de6d9b64 Fabrice Bellard
        /* end of image */
2305 1e491e29 Michael Niedermayer
2306 029911d1 Michael Niedermayer
        if(s->codec_id == CODEC_ID_MPEG2VIDEO){
2307 0426af31 Michael Niedermayer
            s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
2308
        }else
2309
            s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG1;
2310
2311 7bc9090a Michael Niedermayer
        ff_er_frame_end(s);
2312 de6d9b64 Fabrice Bellard
2313
        MPV_frame_end(s);
2314
2315 4e00e76b Michael Niedermayer
        if (s->pict_type == B_TYPE || s->low_delay) {
2316 8e937a4a Michael Niedermayer
            *pict= *(AVFrame*)s->current_picture_ptr;
2317 0c9bbaec Wolfgang Hesseler
            ff_print_debug_info(s, pict);
2318 de6d9b64 Fabrice Bellard
        } else {
2319 1e491e29 Michael Niedermayer
            s->picture_number++;
2320 de6d9b64 Fabrice Bellard
            /* latency of 1 frame for I and P frames */
2321
            /* XXX: use another variable than picture_number */
2322 80097bbf Michael Niedermayer
            if (s->last_picture_ptr != NULL) {
2323 8e937a4a Michael Niedermayer
                *pict= *(AVFrame*)s->last_picture_ptr;
2324 0c9bbaec Wolfgang Hesseler
                 ff_print_debug_info(s, pict);
2325 de6d9b64 Fabrice Bellard
            }
2326
        }
2327 ff862be5 Michael Niedermayer
2328 db6e7795 Michael Niedermayer
        return 1;
2329 de6d9b64 Fabrice Bellard
    } else {
2330 db6e7795 Michael Niedermayer
        return 0;
2331 de6d9b64 Fabrice Bellard
    }
2332
}
2333
2334
static int mpeg1_decode_sequence(AVCodecContext *avctx, 
2335 0c1a9eda Zdenek Kabelac
                                 uint8_t *buf, int buf_size)
2336 de6d9b64 Fabrice Bellard
{
2337
    Mpeg1Context *s1 = avctx->priv_data;
2338
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2339 60832448 Fabrice Bellard
    int width, height, i, v, j;
2340 945f15b7 Michael Niedermayer
    float aspect;
2341 fb4a4a56 Fabrice Bellard
2342 68f593b4 Michael Niedermayer
    init_get_bits(&s->gb, buf, buf_size*8);
2343 de6d9b64 Fabrice Bellard
2344
    width = get_bits(&s->gb, 12);
2345
    height = get_bits(&s->gb, 12);
2346 945f15b7 Michael Niedermayer
    s->aspect_ratio_info= get_bits(&s->gb, 4);
2347 32e7b91a Fabrice Bellard
    if (s->aspect_ratio_info == 0)
2348
        return -1;
2349
    aspect= 1.0/mpeg1_aspect[s->aspect_ratio_info];
2350
    avctx->sample_aspect_ratio= av_d2q(aspect, 255);
2351 945f15b7 Michael Niedermayer
2352 de6d9b64 Fabrice Bellard
    s->frame_rate_index = get_bits(&s->gb, 4);
2353
    if (s->frame_rate_index == 0)
2354
        return -1;
2355
    s->bit_rate = get_bits(&s->gb, 18) * 400;
2356 612476ef Arpi
    if (get_bits1(&s->gb) == 0) /* marker */
2357 de6d9b64 Fabrice Bellard
        return -1;
2358
    if (width <= 0 || height <= 0 ||
2359
        (width % 2) != 0 || (height % 2) != 0)
2360
        return -1;
2361
    if (width != s->width ||
2362
        height != s->height) {
2363
        /* start new mpeg1 context decoding */
2364
        s->out_format = FMT_MPEG1;
2365
        if (s1->mpeg_enc_ctx_allocated) {
2366
            MPV_common_end(s);
2367
        }
2368
        s->width = width;
2369
        s->height = height;
2370 4e00e76b Michael Niedermayer
        avctx->has_b_frames= 1;
2371 0c23ead1 Fabrice Bellard
        s->avctx = avctx;
2372 de6d9b64 Fabrice Bellard
        avctx->width = width;
2373
        avctx->height = height;
2374 14bea432 Michael Niedermayer
        av_reduce(
2375
            &avctx->frame_rate, 
2376
            &avctx->frame_rate_base,
2377
            frame_rate_tab[s->frame_rate_index],
2378
            MPEG1_FRAME_RATE_BASE, //FIXME store in allready reduced form 
2379
            1<<30
2380
            );
2381 de6d9b64 Fabrice Bellard
        avctx->bit_rate = s->bit_rate;
2382
        
2383 2e7b4c84 Ivan Kalvachev
        //get_format() or set_video(width,height,aspect,pix_fmt);
2384
        //until then pix_fmt may be changed right after codec init
2385
        if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2386 a579db0c Ivan Kalvachev
            if( avctx->idct_algo == FF_IDCT_AUTO )
2387
                avctx->idct_algo = FF_IDCT_SIMPLE;
2388 2e7b4c84 Ivan Kalvachev
2389 de6d9b64 Fabrice Bellard
        if (MPV_common_init(s) < 0)
2390
            return -1;
2391
        s1->mpeg_enc_ctx_allocated = 1;
2392 a579db0c Ivan Kalvachev
        s->swap_uv = 0;//just in case vcr2 and mpeg2 stream have been concatinated
2393 de6d9b64 Fabrice Bellard
    }
2394
2395 0368c72d Michael Niedermayer
    s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2396 612476ef Arpi
    skip_bits(&s->gb, 1);
2397 de6d9b64 Fabrice Bellard
2398
    /* get matrix */
2399 612476ef Arpi
    if (get_bits1(&s->gb)) {
2400 de6d9b64 Fabrice Bellard
        for(i=0;i<64;i++) {
2401
            v = get_bits(&s->gb, 8);
2402 2ad1516a Michael Niedermayer
            j = s->intra_scantable.permutated[i];
2403 60832448 Fabrice Bellard
            s->intra_matrix[j] = v;
2404
            s->chroma_intra_matrix[j] = v;
2405 de6d9b64 Fabrice Bellard
        }
2406 25ed7f92 Fabrice Bellard
#ifdef DEBUG
2407
        dprintf("intra matrix present\n");
2408
        for(i=0;i<64;i++)
2409 8e1652dc Michael Niedermayer
            dprintf(" %d", s->intra_matrix[s->intra_scantable.permutated[i]]);
2410 25ed7f92 Fabrice Bellard
        printf("\n");
2411
#endif
2412 de6d9b64 Fabrice Bellard
    } else {
2413
        for(i=0;i<64;i++) {
2414 b0368839 Michael Niedermayer
            int j= s->dsp.idct_permutation[i];
2415 adc09b2e Marko Kreen
            v = ff_mpeg1_default_intra_matrix[i];
2416 2ad1516a Michael Niedermayer
            s->intra_matrix[j] = v;
2417
            s->chroma_intra_matrix[j] = v;
2418 de6d9b64 Fabrice Bellard
        }
2419
    }
2420 612476ef Arpi
    if (get_bits1(&s->gb)) {
2421 de6d9b64 Fabrice Bellard
        for(i=0;i<64;i++) {
2422
            v = get_bits(&s->gb, 8);
2423 2ad1516a Michael Niedermayer
            j = s->intra_scantable.permutated[i];
2424 d7e9533a Michael Niedermayer
            s->inter_matrix[j] = v;
2425
            s->chroma_inter_matrix[j] = v;
2426 de6d9b64 Fabrice Bellard
        }
2427 25ed7f92 Fabrice Bellard
#ifdef DEBUG
2428
        dprintf("non intra matrix present\n");
2429
        for(i=0;i<64;i++)
2430 8e1652dc Michael Niedermayer
            dprintf(" %d", s->inter_matrix[s->intra_scantable.permutated[i]]);
2431 25ed7f92 Fabrice Bellard
        printf("\n");
2432
#endif
2433 de6d9b64 Fabrice Bellard
    } else {
2434
        for(i=0;i<64;i++) {
2435 b0368839 Michael Niedermayer
            int j= s->dsp.idct_permutation[i];
2436 adc09b2e Marko Kreen
            v = ff_mpeg1_default_non_intra_matrix[i];
2437 2ad1516a Michael Niedermayer
            s->inter_matrix[j] = v;
2438
            s->chroma_inter_matrix[j] = v;
2439 de6d9b64 Fabrice Bellard
        }
2440
    }
2441
2442
    /* we set mpeg2 parameters so that it emulates mpeg1 */
2443
    s->progressive_sequence = 1;
2444
    s->progressive_frame = 1;
2445
    s->picture_structure = PICT_FRAME;
2446
    s->frame_pred_frame_dct = 1;
2447 029911d1 Michael Niedermayer
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2448 fb4a4a56 Fabrice Bellard
    avctx->sub_id = 1; /* indicates mpeg1 */
2449 248a189a Fabrice Bellard
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2450 0368c72d Michael Niedermayer
    
2451
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2452
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n", 
2453
               s->avctx->rc_buffer_size, s->bit_rate);
2454
    
2455 de6d9b64 Fabrice Bellard
    return 0;
2456
}
2457
2458 e94bc100 Michael Niedermayer
static int vcr2_init_sequence(AVCodecContext *avctx)
2459
{
2460
    Mpeg1Context *s1 = avctx->priv_data;
2461
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2462 008f0851 Michael Niedermayer
    int i, v;
2463 e94bc100 Michael Niedermayer
2464
    /* start new mpeg1 context decoding */
2465
    s->out_format = FMT_MPEG1;
2466
    if (s1->mpeg_enc_ctx_allocated) {
2467
        MPV_common_end(s);
2468
    }
2469
    s->width = avctx->width;
2470
    s->height = avctx->height;
2471
    avctx->has_b_frames= 0; //true?
2472 ff862be5 Michael Niedermayer
    s->low_delay= 1;
2473 e94bc100 Michael Niedermayer
    s->avctx = avctx;
2474 2e7b4c84 Ivan Kalvachev
2475
    //get_format() or set_video(width,height,aspect,pix_fmt);
2476
    //until then pix_fmt may be changed right after codec init
2477
    if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2478 a579db0c Ivan Kalvachev
        if( avctx->idct_algo == FF_IDCT_AUTO )
2479
            avctx->idct_algo = FF_IDCT_SIMPLE;
2480 e94bc100 Michael Niedermayer
    
2481
    if (MPV_common_init(s) < 0)
2482
        return -1;
2483 a579db0c Ivan Kalvachev
    exchange_uv(s);//common init reset pblocks, so we swap them here
2484
    s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB 
2485 e94bc100 Michael Niedermayer
    s1->mpeg_enc_ctx_allocated = 1;
2486
2487
    for(i=0;i<64;i++) {
2488
        int j= s->dsp.idct_permutation[i];
2489
        v = ff_mpeg1_default_intra_matrix[i];
2490
        s->intra_matrix[j] = v;
2491
        s->chroma_intra_matrix[j] = v;
2492
2493
        v = ff_mpeg1_default_non_intra_matrix[i];
2494
        s->inter_matrix[j] = v;
2495
        s->chroma_inter_matrix[j] = v;
2496
    }
2497
2498
    s->progressive_sequence = 1;
2499
    s->progressive_frame = 1;
2500
    s->picture_structure = PICT_FRAME;
2501
    s->frame_pred_frame_dct = 1;
2502 029911d1 Michael Niedermayer
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2503 008f0851 Michael Niedermayer
    avctx->sub_id = 2; /* indicates mpeg2 */
2504 e94bc100 Michael Niedermayer
    return 0;
2505
}
2506
2507
2508 e2f9490e Fabrice Bellard
static void mpeg_decode_user_data(AVCodecContext *avctx, 
2509
                                  const uint8_t *buf, int buf_size)
2510
{
2511
    const uint8_t *p;
2512
    int len, flags;
2513
    p = buf;
2514
    len = buf_size;
2515
2516
    /* we parse the DTG active format information */
2517
    if (len >= 5 &&
2518
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2519
        flags = p[4];
2520
        p += 5;
2521
        len -= 5;
2522
        if (flags & 0x80) {
2523
            /* skip event id */
2524
            if (len < 2)
2525
                return;
2526
            p += 2;
2527
            len -= 2;
2528
        }
2529
        if (flags & 0x40) {
2530
            if (len < 1)
2531
                return;
2532
            avctx->dtg_active_format = p[0] & 0x0f;
2533
        }
2534
    }
2535
}
2536
2537 80097bbf Michael Niedermayer
/**
2538
 * finds the end of the current frame in the bitstream.
2539
 * @return the position of the first byte of the next frame, or -1
2540
 */
2541
static int mpeg1_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
2542
    ParseContext *pc= &s->parse_context;
2543
    int i;
2544
    uint32_t state;
2545
    
2546
    state= pc->state;
2547
    
2548
    i=0;
2549
    if(!pc->frame_start_found){
2550
        for(i=0; i<buf_size; i++){
2551
            state= (state<<8) | buf[i];
2552
            if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2553
                i++;
2554
                pc->frame_start_found=1;
2555
                break;
2556
            }
2557
        }
2558
    }
2559
    
2560
    if(pc->frame_start_found){
2561
        for(; i<buf_size; i++){
2562
            state= (state<<8) | buf[i];
2563
            if((state&0xFFFFFF00) == 0x100){
2564
                if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2565
                    pc->frame_start_found=0;
2566
                    pc->state=-1; 
2567
                    return i-3;
2568
                }
2569
            }
2570
        }
2571
    }        
2572
    pc->state= state;
2573 bb463d81 Michael Niedermayer
    return END_NOT_FOUND;
2574 80097bbf Michael Niedermayer
}
2575
2576 de6d9b64 Fabrice Bellard
/* handle buffering and image synchronisation */
2577
static int mpeg_decode_frame(AVCodecContext *avctx, 
2578
                             void *data, int *data_size,
2579 0c1a9eda Zdenek Kabelac
                             uint8_t *buf, int buf_size)
2580 de6d9b64 Fabrice Bellard
{
2581
    Mpeg1Context *s = avctx->priv_data;
2582 80097bbf Michael Niedermayer
    uint8_t *buf_end, *buf_ptr;
2583
    int ret, start_code, input_size;
2584 492cd3a9 Michael Niedermayer
    AVFrame *picture = data;
2585 1cb0edb4 Juanjo
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2586 de6d9b64 Fabrice Bellard
    dprintf("fill_buffer\n");
2587
2588
    *data_size = 0;
2589 d7e9533a Michael Niedermayer
2590 de6d9b64 Fabrice Bellard
    /* special case for last picture */
2591 e9174ba4 Michael Niedermayer
    if (buf_size == 0 && s2->low_delay==0 && s2->next_picture_ptr) {
2592
        *picture= *(AVFrame*)s2->next_picture_ptr;
2593
        s2->next_picture_ptr= NULL;
2594 1e491e29 Michael Niedermayer
2595 e9174ba4 Michael Niedermayer
        *data_size = sizeof(AVFrame);
2596 de6d9b64 Fabrice Bellard
        return 0;
2597
    }
2598
2599 80097bbf Michael Niedermayer
    if(s2->flags&CODEC_FLAG_TRUNCATED){
2600 bb463d81 Michael Niedermayer
        int next= mpeg1_find_frame_end(s2, buf, buf_size);
2601 80097bbf Michael Niedermayer
        
2602
        if( ff_combine_frame(s2, next, &buf, &buf_size) < 0 )
2603
            return buf_size;
2604
    }    
2605
    
2606 de6d9b64 Fabrice Bellard
    buf_ptr = buf;
2607
    buf_end = buf + buf_size;
2608 e0a3d744 Juanjo
2609
#if 0    
2610
    if (s->repeat_field % 2 == 1) { 
2611 1cb0edb4 Juanjo
        s->repeat_field++;
2612
        //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2613 e0a3d744 Juanjo
        //        s2->picture_number, s->repeat_field);
2614
        if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2615
            *data_size = sizeof(AVPicture);
2616
            goto the_end;
2617
        }
2618 1cb0edb4 Juanjo
    }
2619 e0a3d744 Juanjo
#endif
2620 e94bc100 Michael Niedermayer
2621
    if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2622
        vcr2_init_sequence(avctx);
2623
2624 80097bbf Michael Niedermayer
    for(;;) {
2625 de6d9b64 Fabrice Bellard
        /* find start next code */
2626 80097bbf Michael Niedermayer
        start_code = find_start_code(&buf_ptr, buf_end);
2627 cfcff636 Michael Niedermayer
        if (start_code < 0){
2628 80de6a80 Michael Niedermayer
            if(s2->pict_type != B_TYPE || avctx->hurry_up==0){
2629
                if (slice_end(avctx, picture)) {
2630 248a189a Fabrice Bellard
                    if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2631 80de6a80 Michael Niedermayer
                        *data_size = sizeof(AVPicture);
2632
                }
2633 db6e7795 Michael Niedermayer
            }
2634 cfcff636 Michael Niedermayer
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2635 de6d9b64 Fabrice Bellard
        }
2636 cf713bb8 Michael Niedermayer
        
2637
        input_size = buf_end - buf_ptr;
2638
2639
        if(avctx->debug & FF_DEBUG_STARTCODE){
2640 9b879566 Michel Bardiaux
            av_log(avctx, AV_LOG_DEBUG, "%3X at %d left %d\n", start_code, buf_ptr-buf, input_size);
2641 cf713bb8 Michael Niedermayer
        }
2642 80097bbf Michael Niedermayer
2643 de6d9b64 Fabrice Bellard
                /* prepare data for next start code */
2644
                switch(start_code) {
2645
                case SEQ_START_CODE:
2646 80097bbf Michael Niedermayer
                    mpeg1_decode_sequence(avctx, buf_ptr, 
2647 de6d9b64 Fabrice Bellard
                                          input_size);
2648
                    break;
2649
                            
2650
                case PICTURE_START_CODE:
2651
                    /* we have a complete image : we try to decompress it */
2652
                    mpeg1_decode_picture(avctx, 
2653 80097bbf Michael Niedermayer
                                         buf_ptr, input_size);
2654 de6d9b64 Fabrice Bellard
                    break;
2655
                case EXT_START_CODE:
2656
                    mpeg_decode_extension(avctx,
2657 80097bbf Michael Niedermayer
                                          buf_ptr, input_size);
2658 e2f9490e Fabrice Bellard
                    break;
2659
                case USER_START_CODE:
2660
                    mpeg_decode_user_data(avctx, 
2661 80097bbf Michael Niedermayer
                                          buf_ptr, input_size);
2662 de6d9b64 Fabrice Bellard
                    break;
2663 05fd1577 Michael Niedermayer
                case GOP_START_CODE:
2664
                    s2->first_field=0;
2665
                    break;
2666 de6d9b64 Fabrice Bellard
                default:
2667
                    if (start_code >= SLICE_MIN_START_CODE &&
2668 d9cb5429 Michael Niedermayer
                        start_code <= SLICE_MAX_START_CODE) {
2669 945f15b7 Michael Niedermayer
                        
2670
                        /* skip b frames if we dont have reference frames */
2671 b536d0aa Michael Niedermayer
                        if(s2->last_picture_ptr==NULL && s2->pict_type==B_TYPE) break;
2672 945f15b7 Michael Niedermayer
                        /* skip b frames if we are in a hurry */
2673
                        if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2674
                        /* skip everything if we are in a hurry>=5 */
2675
                        if(avctx->hurry_up>=5) break;
2676 80097bbf Michael Niedermayer
                        
2677 37b787f1 Michael Niedermayer
                        if (!s->mpeg_enc_ctx_allocated) break;
2678
2679 de6d9b64 Fabrice Bellard
                        ret = mpeg_decode_slice(avctx, picture,
2680 80097bbf Michael Niedermayer
                                                start_code, &buf_ptr, input_size);
2681 db6e7795 Michael Niedermayer
                        emms_c();
2682 dfb476cb Michael Niedermayer
2683 db6e7795 Michael Niedermayer
                        if(ret < 0){
2684
                            if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2685 7bc9090a Michael Niedermayer
                                ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
2686 db6e7795 Michael Niedermayer
                            if(ret==DECODE_SLICE_FATAL_ERROR) return -1;
2687
                        }else{
2688
                            ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x-1, s2->mb_y, AC_END|DC_END|MV_END);
2689 de6d9b64 Fabrice Bellard
                        }
2690
                    }
2691
                    break;
2692
                }
2693
    }
2694
}
2695
2696
static int mpeg_decode_end(AVCodecContext *avctx)
2697
{
2698
    Mpeg1Context *s = avctx->priv_data;
2699
2700
    if (s->mpeg_enc_ctx_allocated)
2701
        MPV_common_end(&s->mpeg_enc_ctx);
2702
    return 0;
2703
}
2704
2705 922bc38d Michael Niedermayer
AVCodec mpeg1video_decoder = {
2706
    "mpeg1video",
2707 de6d9b64 Fabrice Bellard
    CODEC_TYPE_VIDEO,
2708
    CODEC_ID_MPEG1VIDEO,
2709
    sizeof(Mpeg1Context),
2710
    mpeg_decode_init,
2711
    NULL,
2712
    mpeg_decode_end,
2713
    mpeg_decode_frame,
2714 d7425f59 Michael Niedermayer
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2715 922bc38d Michael Niedermayer
    .flush= ff_mpeg_flush,
2716
};
2717
2718
AVCodec mpeg2video_decoder = {
2719
    "mpeg2video",
2720
    CODEC_TYPE_VIDEO,
2721
    CODEC_ID_MPEG2VIDEO,
2722
    sizeof(Mpeg1Context),
2723
    mpeg_decode_init,
2724
    NULL,
2725
    mpeg_decode_end,
2726
    mpeg_decode_frame,
2727
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2728 c512b303 Ivan Kalvachev
    .flush= ff_mpeg_flush,
2729
};
2730
2731
//legacy decoder
2732
AVCodec mpegvideo_decoder = {
2733
    "mpegvideo",
2734
    CODEC_TYPE_VIDEO,
2735
    CODEC_ID_MPEG2VIDEO,
2736
    sizeof(Mpeg1Context),
2737
    mpeg_decode_init,
2738
    NULL,
2739
    mpeg_decode_end,
2740
    mpeg_decode_frame,
2741
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2742 7a06ff14 Michael Niedermayer
    .flush= ff_mpeg_flush,
2743 de6d9b64 Fabrice Bellard
};
2744 2e7b4c84 Ivan Kalvachev
2745
#ifdef HAVE_XVMC
2746
static int mpeg_mc_decode_init(AVCodecContext *avctx){
2747
    Mpeg1Context *s;
2748
2749
    if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2750
        return -1;
2751 a579db0c Ivan Kalvachev
    if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2752 2e7b4c84 Ivan Kalvachev
        dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2753 a579db0c Ivan Kalvachev
    }
2754 2e7b4c84 Ivan Kalvachev
    mpeg_decode_init(avctx);
2755
    s = avctx->priv_data;
2756
</