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1
/*
2
 * MPEG1 codec / MPEG2 decoder
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 * Copyright (c) 2000,2001 Fabrice Bellard.
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 *
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 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
9
 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
14
 *
15
 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 */
19
 
20
/**
21
 * @file mpeg12.c
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 * MPEG1/2 codec
23
 */
24
 
25
//#define DEBUG
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#include "avcodec.h"
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#include "dsputil.h"
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#include "mpegvideo.h"
29

    
30
#include "mpeg12data.h"
31

    
32
//#undef NDEBUG
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//#include <assert.h>
34

    
35

    
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/* Start codes. */
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#define SEQ_END_CODE                0x000001b7
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#define SEQ_START_CODE                0x000001b3
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#define GOP_START_CODE                0x000001b8
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#define PICTURE_START_CODE        0x00000100
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#define SLICE_MIN_START_CODE        0x00000101
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#define SLICE_MAX_START_CODE        0x000001af
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#define EXT_START_CODE                0x000001b5
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#define USER_START_CODE                0x000001b2
45

    
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#define DC_VLC_BITS 9
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#define MV_VLC_BITS 9
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#define MBINCR_VLC_BITS 9
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#define MB_PAT_VLC_BITS 9
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#define MB_PTYPE_VLC_BITS 6
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#define MB_BTYPE_VLC_BITS 6
52
#define TEX_VLC_BITS 9
53

    
54
#ifdef CONFIG_ENCODERS
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static void mpeg1_encode_block(MpegEncContext *s, 
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                         DCTELEM *block, 
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                         int component);
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static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added
59
#endif //CONFIG_ENCODERS
60
static void mpeg1_skip_picture(MpegEncContext *s, int pict_num);
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static inline int mpeg1_decode_block_inter(MpegEncContext *s, 
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                              DCTELEM *block, 
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                              int n);
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static inline int mpeg1_decode_block_intra(MpegEncContext *s, 
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                              DCTELEM *block, 
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                              int n);
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static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, 
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                                        DCTELEM *block, 
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                                        int n);
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static inline int mpeg2_decode_block_intra(MpegEncContext *s, 
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                                    DCTELEM *block, 
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                                    int n);
73
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
74
static void exchange_uv(MpegEncContext *s);
75

    
76
#ifdef HAVE_XVMC
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extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
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extern int XVMC_field_end(MpegEncContext *s);
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extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
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extern void XVMC_init_block(MpegEncContext *s);//set s->block
81
#endif
82

    
83
#ifdef CONFIG_ENCODERS
84
static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
85
static uint8_t fcode_tab[MAX_MV*2+1];
86

    
87
static uint32_t uni_mpeg1_ac_vlc_bits[64*64*2];
88
static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
89

    
90
/* simple include everything table for dc, first byte is bits number next 3 are code*/
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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];
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static int8_t mpeg1_max_level[2][64];
96
#endif //CONFIG_ENCODERS
97

    
98
static void init_2d_vlc_rl(RLTable *rl)
99
{
100
    int i;
101
    
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++){
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        int code= rl->vlc.table[i][0];
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        int len = rl->vlc.table[i][1];
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        int level, run;
112
    
113
        if(len==0){ // illegal code
114
            run= 65;
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            level= MAX_LEVEL;
116
        }else if(len<0){ //more bits needed
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            run= 0;
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            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
            }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
#ifdef CONFIG_ENCODERS
138
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

    
184
static void put_header(MpegEncContext *s, int header)
185
{
186
    align_put_bits(&s->pb);
187
    put_bits(&s->pb, 16, header>>16);
188
    put_bits(&s->pb, 16, header&0xFFFF);
189
}
190

    
191
/* put sequence header if needed */
192
static void mpeg1_encode_sequence_header(MpegEncContext *s)
193
{
194
        unsigned int vbv_buffer_size;
195
        unsigned int fps, v;
196
        int n, i;
197
        uint64_t time_code;
198
        float best_aspect_error= 1E10;
199
        float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
200
        int constraint_parameter_flag;
201
        
202
        if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
203
        
204
        if (s->current_picture.key_frame) {
205
            /* 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
                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
                    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);
226
            
227
            for(i=1; i<15; i++){
228
                float error= aspect_ratio;
229
                if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
230
                    error-= 1.0/mpeg1_aspect[i];
231
                else
232
                    error-= av_q2d(mpeg2_aspect[i])*s->height/s->width;
233
             
234
                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
            put_bits(&s->pb, 4, s->frame_rate_index);
244
            
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

    
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
                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 */
262
            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
            
275
            ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
276
            ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
277

    
278
            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
                put_bits(&s->pb, 1, s->progressive_sequence);
285
                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
            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
            time_code = (int64_t)s->fake_picture_number * MPEG1_FRAME_RATE_BASE;
302
            s->gop_picture_number = s->fake_picture_number;
303
            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
            put_bits(&s->pb, 1, 1);
306
            put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
307
            put_bits(&s->pb, 6, (uint32_t)((time_code % fps) / MPEG1_FRAME_RATE_BASE));
308
            put_bits(&s->pb, 1, 0); /* closed gop */
309
            put_bits(&s->pb, 1, 0); /* broken link */
310
        }
311

    
312
        if (s->avctx->frame_rate < (24 * s->avctx->frame_rate_base) && s->picture_number > 0) {
313
            /* 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
            n = av_rescale((int64_t)s->picture_number * s->avctx->frame_rate_base, fps, s->avctx->frame_rate) / MPEG1_FRAME_RATE_BASE - 1;
317
            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
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

    
335
/* insert a fake P picture */
336
static void mpeg1_skip_picture(MpegEncContext *s, int pict_num)
337
{
338
    assert(s->codec_id == CODEC_ID_MPEG1VIDEO); // mpeg2 can do these repeat things
339

    
340
    /* 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
    encode_mb_skip_run(s, 0);
359
    
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
    encode_mb_skip_run(s, s->mb_width * s->mb_height - 2);
369
    
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
#endif //CONFIG_ENCODERS
378

    
379
static void common_init(MpegEncContext *s)
380
{
381
    s->y_dc_scale_table=
382
    s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
383
}
384

    
385
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
#ifdef CONFIG_ENCODERS
393

    
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
void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
401
{
402
    mpeg1_encode_sequence_header(s);
403

    
404
    /* mpeg1 picture header */
405
    put_header(s, PICTURE_START_CODE);
406
    /* temporal reference */
407

    
408
    // RAL: s->picture_number instead of s->fake_picture_number
409
    put_bits(&s->pb, 10, (s->picture_number - 
410
                          s->gop_picture_number) & 0x3ff); 
411
    s->fake_picture_number++;
412
    
413
    put_bits(&s->pb, 3, s->pict_type);
414

    
415
    s->vbv_delay_ptr= s->pb.buf + get_bit_count(&s->pb)/8;
416
    put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
417
    
418
    // RAL: Forward f_code also needed for B frames
419
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
420
        put_bits(&s->pb, 1, 0); /* half pel coordinates */
421
        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
    }
426
    
427
    // 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
        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
    }
435

    
436
    put_bits(&s->pb, 1, 0); /* extra bit picture */
437

    
438
    s->frame_pred_frame_dct = 1;
439
    if(s->codec_id == CODEC_ID_MPEG2VIDEO){
440
        put_header(s, EXT_START_CODE);
441
        put_bits(&s->pb, 4, 8); //pic ext
442
        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
        put_bits(&s->pb, 2, s->intra_dc_precision);
455
        put_bits(&s->pb, 2, s->picture_structure= PICT_FRAME);
456
        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
        /* 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
        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
        s->progressive_frame = s->progressive_sequence;
473
        put_bits(&s->pb, 1, s->progressive_frame);
474
        put_bits(&s->pb, 1, 0); //composite_display_flag
475
    }
476
    
477
    s->mb_y=0;
478
    ff_mpeg1_encode_slice_header(s);
479
}
480

    
481
static inline void put_mb_modes(MpegEncContext *s, int n, int bits, 
482
                                int has_mv, int field_motion)
483
{
484
    put_bits(&s->pb, n, bits);
485
    if (!s->frame_pred_frame_dct) {
486
        if (has_mv) 
487
            put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
488
        put_bits(&s->pb, 1, s->interlaced_dct);
489
    }
490
}
491

    
492
void mpeg1_encode_mb(MpegEncContext *s,
493
                     DCTELEM block[6][64],
494
                     int motion_x, int motion_y)
495
{
496
    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

    
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
    
508
    if (cbp == 0 && !first_mb && (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) && 
509
        ((s->pict_type == P_TYPE && s->mv_type == MV_TYPE_16X16 && (motion_x | motion_y) == 0) ||
510
        (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
        s->mb_skip_run++;
513
        s->qscale -= s->dquant;
514
        s->skip_count++;
515
        s->misc_bits++;
516
        s->last_bits++;
517
        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
    } else {
522
        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
        }
528
        
529
        if (s->pict_type == I_TYPE) {
530
            if(s->dquant && cbp){
531
                put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
532
                put_bits(&s->pb, 5, s->qscale);
533
            }else{
534
                put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
535
                s->qscale -= s->dquant;
536
            }
537
            s->misc_bits+= get_bits_diff(s);
538
            s->i_count++;
539
        } else if (s->mb_intra) {
540
            if(s->dquant && cbp){
541
                put_mb_modes(s, 6, 0x01, 0, 0);
542
                put_bits(&s->pb, 5, s->qscale);
543
            }else{
544
                put_mb_modes(s, 5, 0x03, 0, 0);
545
                s->qscale -= s->dquant;
546
            }
547
            s->misc_bits+= get_bits_diff(s);
548
            s->i_count++;
549
            memset(s->last_mv, 0, sizeof(s->last_mv));
550
        } else if (s->pict_type == P_TYPE) { 
551
            if(s->mv_type == MV_TYPE_16X16){
552
                if (cbp != 0) {
553
                    if ((motion_x|motion_y) == 0) {
554
                        if(s->dquant){
555
                            put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
556
                            put_bits(&s->pb, 5, s->qscale);
557
                        }else{
558
                            put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
559
                        }
560
                        s->misc_bits+= get_bits_diff(s);
561
                    } else {
562
                        if(s->dquant){
563
                            put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
564
                            put_bits(&s->pb, 5, s->qscale);
565
                        }else{
566
                            put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
567
                        }
568
                        s->misc_bits+= get_bits_diff(s);
569
                        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
                        s->mv_bits+= get_bits_diff(s);
572
                    }
573
                } else {
574
                    put_bits(&s->pb, 3, 1); /* motion only */
575
                    if (!s->frame_pred_frame_dct)
576
                        put_bits(&s->pb, 2, 2); /* motion_type: frame */
577
                    s->misc_bits+= get_bits_diff(s);
578
                    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
                    s->qscale -= s->dquant;
581
                    s->mv_bits+= get_bits_diff(s);
582
                }
583
                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
                    }
595
                } else {
596
                    put_bits(&s->pb, 3, 1); /* motion only */
597
                    put_bits(&s->pb, 2, 1); /* motion_type: field */
598
                    s->qscale -= s->dquant;
599
                }
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
                    }
661
                }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
            }
688
            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
        for(i=0;i<6;i++) {
693
            if (cbp & (1 << (5 - i))) {
694
                mpeg1_encode_block(s, block[i], i);
695
            }
696
        }
697
        s->mb_skip_run = 0;
698
        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
    }
703
}
704

    
705
// RAL: Parameter added: f_or_b_code
706
static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
707
{
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
        bit_size = f_or_b_code - 1;
718
        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

    
741
        assert(code > 0 && code <= 16);
742

    
743
        put_bits(&s->pb,
744
                 mbMotionVectorTable[code][1], 
745
                 mbMotionVectorTable[code][0]); 
746

    
747
        put_bits(&s->pb, 1, sign);
748
        if (bit_size > 0) {
749
            put_bits(&s->pb, bit_size, bits);
750
        }
751
    }
752
}
753

    
754
void ff_mpeg1_encode_init(MpegEncContext *s)
755
{
756
    static int done=0;
757

    
758
    common_init(s);
759

    
760
    if(!done){
761
        int f_code;
762
        int mv;
763
        int i;
764

    
765
        done=1;
766
        init_rl(&rl_mpeg1);
767

    
768
        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
        
774
        init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_bits, uni_mpeg1_ac_vlc_len);
775

    
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
        mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
797

    
798
        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
    s->me.mv_penalty= mv_penalty;
833
    s->fcode_tab= fcode_tab;
834
    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
    s->intra_ac_vlc_length=
842
    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
}
846

    
847
static inline void encode_dc(MpegEncContext *s, int diff, int component)
848
{
849
    if (component == 0) {
850
        put_bits(
851
            &s->pb, 
852
            mpeg1_lum_dc_uni[diff+255]&0xFF,
853
            mpeg1_lum_dc_uni[diff+255]>>8);
854
    } else {
855
        put_bits(
856
            &s->pb, 
857
            mpeg1_chr_dc_uni[diff+255]&0xFF,
858
            mpeg1_chr_dc_uni[diff+255]>>8);
859
    }
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
//    RLTable *rl = &rl_mpeg1;
869

    
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
/*
881
        if (s->intra_vlc_format)
882
            rl = &rl_mpeg2;
883
        else
884
            rl = &rl_mpeg1;
885
*/
886
    } 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
                code = ((uint32_t)level >> 31); /* the sign bit */
892
                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

    
904
    for(;i<=last_index;i++) {
905
        j = s->intra_scantable.permutated[i];
906
        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
            
916
            alevel= level;
917
            MASK_ABS(sign, alevel)
918
            sign&=1;
919

    
920
//            code = get_rl_index(rl, 0, run, alevel);
921
            if (alevel <= mpeg1_max_level[0][run]){
922
                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
            } else {
926
                /* 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
                /* escape: only clip in this case */
929
                put_bits(&s->pb, 6, run);
930
                if(s->codec_id == CODEC_ID_MPEG1VIDEO){
931
                    if (alevel < 128) {
932
                        put_bits(&s->pb, 8, level & 0xff);
933
                    } else {
934
                        if (level < 0) {
935
                            put_bits(&s->pb, 16, 0x8001 + level + 255);
936
                        } else {
937
                            put_bits(&s->pb, 16, level & 0xffff);
938
                        }
939
                    }
940
                }else{
941
                    put_bits(&s->pb, 12, level & 0xfff);
942
                }
943
            }
944
            last_non_zero = i;
945
        }
946
    }
947
    /* end of block */
948
    put_bits(&s->pb, 2, 0x2);
949
}
950
#endif //CONFIG_ENCODERS
951

    
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
static void init_vlcs()
964
{
965
    static int done = 0;
966

    
967
    if (!done) {
968
        done = 1;
969

    
970
        init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12, 
971
                 vlc_dc_lum_bits, 1, 1,
972
                 vlc_dc_lum_code, 2, 2);
973
        init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12, 
974
                 vlc_dc_chroma_bits, 1, 1,
975
                 vlc_dc_chroma_code, 2, 2);
976
        init_vlc(&mv_vlc, MV_VLC_BITS, 17, 
977
                 &mbMotionVectorTable[0][1], 2, 1,
978
                 &mbMotionVectorTable[0][0], 2, 1);
979
        init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36, 
980
                 &mbAddrIncrTable[0][1], 2, 1,
981
                 &mbAddrIncrTable[0][0], 2, 1);
982
        init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 63, 
983
                 &mbPatTable[0][1], 2, 1,
984
                 &mbPatTable[0][0], 2, 1);
985
        
986
        init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7, 
987
                 &table_mb_ptype[0][1], 2, 1,
988
                 &table_mb_ptype[0][0], 2, 1);
989
        init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11, 
990
                 &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

    
995
        init_2d_vlc_rl(&rl_mpeg1);
996
        init_2d_vlc_rl(&rl_mpeg2);
997
    }
998
}
999

    
1000
static inline int get_dmv(MpegEncContext *s)
1001
{
1002
    if(get_bits1(&s->gb)) 
1003
        return 1 - (get_bits1(&s->gb) << 1);
1004
    else
1005
        return 0;
1006
}
1007

    
1008
static inline int get_qscale(MpegEncContext *s)
1009
{
1010
    int qscale = get_bits(&s->gb, 5);
1011
    if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1012
        if (s->q_scale_type) {
1013
            return non_linear_qscale[qscale];
1014
        } else {
1015
            return qscale << 1;
1016
        }
1017
    }
1018
    return qscale;
1019
}
1020

    
1021
/* 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
    int i, j, k, cbp, val, mb_type, motion_type;
1031
    
1032
    dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
1033

    
1034
    assert(s->mb_skiped==0);
1035

    
1036
    if (s->mb_skip_run-- != 0) {
1037
        if(s->pict_type == I_TYPE){
1038
            av_log(s->avctx, AV_LOG_ERROR, "skiped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1039
            return -1;
1040
        }
1041
    
1042
        /* 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
            s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1053
            s->mb_skiped = 1;
1054
            s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1055
        } 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

    
1062
            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
            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
        }
1069

    
1070
        return 0;
1071
    }
1072

    
1073
    switch(s->pict_type) {
1074
    default:
1075
    case I_TYPE:
1076
        if (get_bits1(&s->gb) == 0) {
1077
            if (get_bits1(&s->gb) == 0){
1078
                av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
1079
                return -1;
1080
            }
1081
            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
1082
        } else {
1083
            mb_type = MB_TYPE_INTRA;
1084
        }
1085
        break;
1086
    case P_TYPE:
1087
        mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
1088
        if (mb_type < 0){
1089
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
1090
            return -1;
1091
        }
1092
        mb_type = ptype2mb_type[ mb_type ];
1093
        break;
1094
    case B_TYPE:
1095
        mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
1096
        if (mb_type < 0){
1097
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
1098
            return -1;
1099
        }
1100
        mb_type = btype2mb_type[ mb_type ];
1101
        break;
1102
    }
1103
    dprintf("mb_type=%x\n", mb_type);
1104
//    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

    
1112
        if (IS_QUANT(mb_type))
1113
            s->qscale = get_qscale(s);
1114
        
1115
        if (s->concealment_motion_vectors) {
1116
            /* just parse them */
1117
            if (s->picture_structure != PICT_FRAME) 
1118
                skip_bits1(&s->gb); /* field select */
1119
            
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
            skip_bits1(&s->gb); /* marker */
1126
        }else
1127
            memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
1128
        s->mb_intra = 1;
1129
#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

    
1139
        if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1140
            for(i=0;i<6;i++) {
1141
                if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
1142
                    return -1;
1143
            }
1144
        } else {
1145
            for(i=0;i<6;i++) {
1146
                if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
1147
                    return -1;
1148
            }
1149
        }
1150
    } else {
1151
        if (mb_type & MB_TYPE_ZERO_MV){
1152
            assert(mb_type & MB_TYPE_CBP);
1153

    
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
                !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
1184
                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
                            /* full_pel: only for mpeg1 */
1207
                            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
                            mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; 
1214
                            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
                        }
1225
                        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
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; 
1245
                            s->field_select[i][0] = get_bits1(&s->gb);
1246
                            for(k=0;k<2;k++) {
1247
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
1248
                                                         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
                            }
1253
                        }
1254
                        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

    
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
                            if (s->picture_structure == PICT_FRAME) {
1279
                                mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; 
1280

    
1281
                                //m = 1 + 2 * s->top_field_first;
1282
                                m = s->top_field_first ? 1 : 3;
1283

    
1284
                                /* top -> top pred */
1285
                                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
                                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
                                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
                            }
1300
                        }
1301
                        break;
1302
                    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
                    }
1306
                }
1307
            }
1308
        }
1309
        
1310
        s->mb_intra = 0;
1311

    
1312
        if (HAS_CBP(mb_type)) {
1313
            cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1314
            if (cbp < 0){
1315
                av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1316
                return -1;
1317
            }
1318
            cbp++;
1319

    
1320
#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
            if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1331
                for(i=0;i<6;i++) {
1332
                    if (cbp & 32) {
1333
                        if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
1334
                            return -1;
1335
                    } else {
1336
                        s->block_last_index[i] = -1;
1337
                    }
1338
                    cbp+=cbp;
1339
                }
1340
            } else {
1341
                for(i=0;i<6;i++) {
1342
                    if (cbp & 32) {
1343
                        if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
1344
                            return -1;
1345
                    } else {
1346
                        s->block_last_index[i] = -1;
1347
                    }
1348
                    cbp+=cbp;
1349
                }
1350
            }
1351
        }else{
1352
            for(i=0;i<6;i++)
1353
                s->block_last_index[i] = -1;
1354
        }
1355
    }
1356

    
1357
    s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
1358

    
1359
    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
    int code, sign, val, l, shift;
1366

    
1367
    code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
1368
    if (code == 0) {
1369
        return pred;
1370
    }
1371
    if (code < 0) {
1372
        return 0xffff;
1373
    }
1374

    
1375
    sign = get_bits1(&s->gb);
1376
    shift = fcode - 1;
1377
    val = code;
1378
    if (shift) {
1379
        val = (val - 1) << shift;
1380
        val |= get_bits(&s->gb, shift);
1381
        val++;
1382
    }
1383
    if (sign)
1384
        val = -val;
1385
    val += pred;
1386
    
1387
    /* modulo decoding */
1388
    l = 1 << (shift+4);
1389
    val = ((val + l)&(l*2-1)) - l;
1390
    return val;
1391
}
1392

    
1393
static inline int decode_dc(GetBitContext *gb, int component)
1394
{
1395
    int code, diff;
1396

    
1397
    if (component == 0) {
1398
        code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
1399
    } else {
1400
        code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
1401
    }
1402
    if (code < 0){
1403
        av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
1404
        return 0xffff;
1405
    }
1406
    if (code == 0) {
1407
        diff = 0;
1408
    } else {
1409
        diff = get_xbits(gb, code);
1410
    }
1411
    return diff;
1412
}
1413

    
1414
static inline int mpeg1_decode_block_intra(MpegEncContext *s, 
1415
                               DCTELEM *block, 
1416
                               int n)
1417
{
1418
    int level, dc, diff, i, j, run;
1419
    int component;
1420
    RLTable *rl = &rl_mpeg1;
1421
    uint8_t * const scantable= s->intra_scantable.permutated;
1422
    const uint16_t *quant_matrix= s->intra_matrix;
1423
    const int qscale= s->qscale;
1424

    
1425
    /* DC coef */
1426
    component = (n <= 3 ? 0 : n - 4 + 1);
1427
    diff = decode_dc(&s->gb, component);
1428
    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
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1476
                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
    uint8_t * const scantable= s->intra_scantable.permutated;
1494
    const uint16_t *quant_matrix= s->inter_matrix;
1495
    const int qscale= s->qscale;
1496

    
1497
    {
1498
        int v;
1499
        OPEN_READER(re, &s->gb);
1500
        i = -1;
1501
        /* special case for the first coef. no need to add a second vlc table */
1502
        UPDATE_CACHE(re, &s->gb);
1503
        v= SHOW_UBITS(re, &s->gb, 2);
1504
        if (v & 2) {
1505
            LAST_SKIP_BITS(re, &s->gb, 2);
1506
            level= (3*qscale*quant_matrix[0])>>4;
1507
            level= (level-1)|1;
1508
            if(v&1)
1509
                level= -level;
1510
            block[0] = level;
1511
            i++;
1512
        }
1513

    
1514
        /* 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
            }
1550
            if (i > 63){
1551
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1552
                return -1;
1553
            }
1554

    
1555
            block[j] = level;
1556
        }
1557
        CLOSE_READER(re, &s->gb);
1558
    }
1559
    s->block_last_index[n] = i;
1560
    return 0;
1561
}
1562

    
1563
/* Also does unquantization here, since I will never support mpeg2
1564
   encoding */
1565
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, 
1566
                               DCTELEM *block, 
1567
                               int n)
1568
{
1569
    int level, i, j, run;
1570
    RLTable *rl = &rl_mpeg1;
1571
    uint8_t * const scantable= s->intra_scantable.permutated;
1572
    const uint16_t *quant_matrix;
1573
    const int qscale= s->qscale;
1574
    int mismatch;
1575

    
1576
    mismatch = 1;
1577

    
1578
    {
1579
        int v;
1580
        OPEN_READER(re, &s->gb);
1581
        i = -1;
1582
        if (n < 4)
1583
            quant_matrix = s->inter_matrix;
1584
        else
1585
            quant_matrix = s->chroma_inter_matrix;
1586

    
1587
        /* special case for the first coef. no need to add a second vlc table */
1588
        UPDATE_CACHE(re, &s->gb);
1589
        v= SHOW_UBITS(re, &s->gb, 2);
1590
        if (v & 2) {
1591
            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
        }
1599

    
1600
        /* 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
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1630
                return -1;
1631
            }
1632
            
1633
            mismatch ^= level;
1634
            block[j] = level;
1635
        }
1636
        CLOSE_READER(re, &s->gb);
1637
    }
1638
    block[63] ^= (mismatch & 1);
1639
    
1640
    s->block_last_index[n] = i;
1641
    return 0;
1642
}
1643

    
1644
static inline int mpeg2_decode_block_intra(MpegEncContext *s, 
1645
                               DCTELEM *block, 
1646
                               int n)
1647
{
1648
    int level, dc, diff, i, j, run;
1649
    int component;
1650
    RLTable *rl;
1651
    uint8_t * const scantable= s->intra_scantable.permutated;
1652
    const uint16_t *quant_matrix;
1653
    const int qscale= s->qscale;
1654
    int mismatch;
1655

    
1656
    /* DC coef */
1657
    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
    diff = decode_dc(&s->gb, component);
1665
    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
    mismatch = block[0] ^ 1;
1673
    i = 0;
1674
    if (s->intra_vlc_format)
1675
        rl = &rl_mpeg2;
1676
    else
1677
        rl = &rl_mpeg1;
1678

    
1679
    {
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
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1710
                return -1;
1711
            }
1712
            
1713
            mismatch^= level;
1714
            block[j] = level;
1715
        }
1716
        CLOSE_READER(re, &s->gb);
1717
    }
1718
    block[63]^= mismatch&1;
1719
    
1720
    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
    int repeat_field; /* true if we must repeat the field */
1728
    AVPanScan pan_scan; /** some temporary storage for the panscan */
1729
} Mpeg1Context;
1730

    
1731
static int mpeg_decode_init(AVCodecContext *avctx)
1732
{
1733
    Mpeg1Context *s = avctx->priv_data;
1734
    
1735
    s->mpeg_enc_ctx.flags= avctx->flags;
1736
    common_init(&s->mpeg_enc_ctx);
1737
    init_vlcs();
1738

    
1739
    s->mpeg_enc_ctx_allocated = 0;
1740
    s->mpeg_enc_ctx.picture_number = 0;
1741
    s->repeat_field = 0;
1742
    s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1743
    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
static int find_start_code(uint8_t **pbuf_ptr, uint8_t *buf_end)
1749
{
1750
    uint8_t *buf_ptr;
1751
    unsigned int state=0xFFFFFFFF, v;
1752
    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
                                uint8_t *buf, int buf_size)
1772
{
1773
    Mpeg1Context *s1 = avctx->priv_data;
1774
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1775
    int ref, f_code, vbv_delay;
1776

    
1777
    init_get_bits(&s->gb, buf, buf_size*8);
1778

    
1779
    ref = get_bits(&s->gb, 10); /* temporal ref */
1780
    s->pict_type = get_bits(&s->gb, 3);
1781
    dprintf("pict_type=%d number=%d\n", s->pict_type, s->picture_number);
1782

    
1783
    vbv_delay= get_bits(&s->gb, 16);
1784
    if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1785
        s->full_pel[0] = get_bits1(&s->gb);
1786
        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
        s->full_pel[1] = get_bits1(&s->gb);
1794
        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
    s->current_picture.pict_type= s->pict_type;
1801
    s->current_picture.key_frame= s->pict_type == I_TYPE;
1802
    
1803
    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
    int bit_rate_ext, vbv_buf_ext;
1813
    int frame_rate_ext_n, frame_rate_ext_d;
1814
    int level, profile;
1815

    
1816
    skip_bits(&s->gb, 1); /* profil and level esc*/
1817
    profile= get_bits(&s->gb, 3);
1818
    level= get_bits(&s->gb, 4);
1819
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1820
    skip_bits(&s->gb, 2); /* chroma_format */
1821
    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
    skip_bits1(&s->gb); /* marker */
1828
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1829

    
1830
    s->low_delay = get_bits1(&s->gb);
1831
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1832

    
1833
    frame_rate_ext_n = get_bits(&s->gb, 2);
1834
    frame_rate_ext_d = get_bits(&s->gb, 5);
1835
    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
    dprintf("sequence extension\n");
1843
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1844
    s->avctx->sub_id = 2; /* indicates mpeg2 found */
1845

    
1846
    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
    
1856
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1857
        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
}
1860

    
1861
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
    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
    
1888
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1889
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1890
}
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
        av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n", 
1906
            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
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1913
{
1914
    int i, v, j;
1915

    
1916
    dprintf("matrix extension\n");
1917

    
1918
    if (get_bits1(&s->gb)) {
1919
        for(i=0;i<64;i++) {
1920
            v = get_bits(&s->gb, 8);
1921
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1922
            s->intra_matrix[j] = v;
1923
            s->chroma_intra_matrix[j] = v;
1924
        }
1925
    }
1926
    if (get_bits1(&s->gb)) {
1927
        for(i=0;i<64;i++) {
1928
            v = get_bits(&s->gb, 8);
1929
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1930
            s->inter_matrix[j] = v;
1931
            s->chroma_inter_matrix[j] = v;
1932
        }
1933
    }
1934
    if (get_bits1(&s->gb)) {
1935
        for(i=0;i<64;i++) {
1936
            v = get_bits(&s->gb, 8);
1937
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1938
            s->chroma_intra_matrix[j] = v;
1939
        }
1940
    }
1941
    if (get_bits1(&s->gb)) {
1942
        for(i=0;i<64;i++) {
1943
            v = get_bits(&s->gb, 8);
1944
            j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1945
            s->chroma_inter_matrix[j] = v;
1946
        }
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
    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

    
1969
    if(s->picture_structure == PICT_FRAME)
1970
        s->first_field=0;
1971
    else{
1972
        s->first_field ^= 1;
1973
        memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1974
    }
1975
    
1976
    if(s->alternate_scan){
1977
        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
    }else{
1980
        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
    }
1983
    
1984
    /* composite display not parsed */
1985
    dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
1986
    dprintf("picture_structure=%d\n", s->picture_structure);
1987
    dprintf("top field first=%d\n", s->top_field_first);
1988
    dprintf("repeat first field=%d\n", s->repeat_first_field);
1989
    dprintf("conceal=%d\n", s->concealment_motion_vectors);
1990
    dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
1991
    dprintf("alternate_scan=%d\n", s->alternate_scan);
1992
    dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1993
    dprintf("progressive_frame=%d\n", s->progressive_frame);
1994
}
1995

    
1996
static void mpeg_decode_extension(AVCodecContext *avctx, 
1997
                                  uint8_t *buf, int buf_size)
1998
{
1999
    Mpeg1Context *s1 = avctx->priv_data;
2000
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2001
    int ext_type;
2002

    
2003
    init_get_bits(&s->gb, buf, buf_size*8);
2004
    
2005
    ext_type = get_bits(&s->gb, 4);
2006
    switch(ext_type) {
2007
    case 0x1:
2008
        mpeg_decode_sequence_extension(s);
2009
        break;
2010
    case 0x2:
2011
        mpeg_decode_sequence_display_extension(s1);
2012
        break;
2013
    case 0x3:
2014
        mpeg_decode_quant_matrix_extension(s);
2015
        break;
2016
    case 0x7:
2017
        mpeg_decode_picture_display_extension(s1);
2018
        break;
2019
    case 0x8:
2020
        mpeg_decode_picture_coding_extension(s);
2021
        break;
2022
    }
2023
}
2024

    
2025
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
}
2032

    
2033
#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
static int mpeg_decode_slice(AVCodecContext *avctx, 
2044
                              AVFrame *pict,
2045
                              int start_code,
2046
                              uint8_t **buf, int buf_size)
2047
{
2048
    Mpeg1Context *s1 = avctx->priv_data;
2049
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2050
    int ret;
2051
    const int field_pic= s->picture_structure != PICT_FRAME;
2052

    
2053
    s->resync_mb_x= s->mb_x = 
2054
    s->resync_mb_y= s->mb_y = -1;
2055
    
2056
    start_code = (start_code - 1) & 0xff;
2057
    if (start_code >= s->mb_height){
2058
        av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", start_code, s->mb_height);
2059
        return -1;
2060
    }
2061
    
2062
    ff_mpeg1_clean_buffers(s);
2063
    s->interlaced_dct = 0;
2064
        
2065
    /* start frame decoding */
2066
    if (s->first_slice) {
2067
      if(s->first_field || s->picture_structure==PICT_FRAME){
2068
        if(MPV_frame_start(s, avctx) < 0)
2069
            return DECODE_SLICE_FATAL_ERROR;
2070

    
2071
        ff_er_frame_start(s);
2072

    
2073
        /* first check if we must repeat the frame */
2074
        s->current_picture_ptr->repeat_pict = 0;
2075
        if (s->repeat_first_field) {
2076
            if (s->progressive_sequence) {
2077
                if (s->top_field_first)
2078
                    s->current_picture_ptr->repeat_pict = 4;
2079
                else
2080
                    s->current_picture_ptr->repeat_pict = 2;
2081
            } else if (s->progressive_frame) {
2082
                s->current_picture_ptr->repeat_pict = 1;
2083
            }
2084
        }         
2085

    
2086
        *s->current_picture_ptr->pan_scan= s1->pan_scan;
2087
      }else{ //second field
2088
            int i;
2089
            
2090
            if(!s->current_picture_ptr){
2091
                av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
2092
                return -1;
2093
            }
2094
            
2095
            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
#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

    
2110
    init_get_bits(&s->gb, *buf, buf_size*8);
2111

    
2112
    s->qscale = get_qscale(s);
2113
    if (s->first_slice && (s->first_field || s->picture_structure==PICT_FRAME)) {
2114
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
2115
             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
                 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
                 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"", 
2119
                 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
    if(s->qscale == 0){
2126
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
2127
        return -1;
2128
    }
2129
    
2130
    /* extra slice info */
2131
    while (get_bits1(&s->gb) != 0) {
2132
        skip_bits(&s->gb, 8);
2133
    }
2134
    
2135
    s->mb_x=0;
2136

    
2137
    for(;;) {
2138
        int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2139
        if (code < 0){
2140
            av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
2141
            return -1;
2142
        }
2143
        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
    
2154
    s->resync_mb_x= s->mb_x;
2155
    s->resync_mb_y= s->mb_y = start_code;
2156
    s->mb_skip_run= 0;
2157
    ff_init_block_index(s);
2158

    
2159
    for(;;) {
2160
#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
        s->dsp.clear_blocks(s->block[0]);
2167

    
2168
        ret = mpeg_decode_mb(s, s->block);
2169
        s->chroma_qscale= s->qscale;
2170

    
2171
        dprintf("ret=%d\n", ret);
2172
        if (ret < 0)
2173
            return -1;
2174

    
2175
        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
            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
            if(field_pic && !s->first_field)
2181
                xy += wrap/2;
2182

    
2183
            if (s->mb_intra) {
2184
                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
            }else if (s->mv_type == MV_TYPE_16X16){
2187
                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
            } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
2192
                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
            }
2201

    
2202
            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

    
2211
            if(s->pict_type != B_TYPE){
2212
                motion_back_top_x = motion_back_top_y = motion_back_bottom_x = motion_back_bottom_y = 0;
2213
            }
2214

    
2215
            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
        }
2224

    
2225
        s->dest[0] += 16;
2226
        s->dest[1] += 8;
2227
        s->dest[2] += 8;
2228

    
2229
        MPV_decode_mb(s, s->block);
2230
        
2231
        if (++s->mb_x >= s->mb_width) {
2232

    
2233
            ff_draw_horiz_band(s, 16*s->mb_y, 16);
2234

    
2235
            s->mb_x = 0;
2236
            s->mb_y++;
2237

    
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
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d\n", left);
2244
                    return -1;
2245
                }else
2246
                    goto eos;
2247
            }
2248
            
2249
            ff_init_block_index(s);
2250
        }
2251

    
2252
        /* skip mb handling */
2253
        if (s->mb_skip_run == -1) {
2254
            /* read again increment */
2255
            s->mb_skip_run = 0;
2256
            for(;;) {
2257
                int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
2258
                if (code < 0){
2259
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
2260
                    return -1;
2261
                }
2262
                if (code >= 33) {
2263
                    if (code == 33) {
2264
                        s->mb_skip_run += 33;
2265
                    }else if(code == 35){
2266
                        if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
2267
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
2268
                            return -1;
2269
                        }
2270
                        goto eos; /* end of slice */
2271
                    }
2272
                    /* otherwise, stuffing, nothing to do */
2273
                } else {
2274
                    s->mb_skip_run += code;
2275
                    break;
2276
                }
2277
            }
2278
        }
2279
    }
2280
eos: // end of slice
2281
    *buf += get_bits_count(&s->gb)/8 - 1;
2282
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2283
    return 0;
2284
}
2285

    
2286
/**
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
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2296
        return 0;
2297

    
2298
#ifdef HAVE_XVMC
2299
    if(s->avctx->xvmc_acceleration)
2300
        XVMC_field_end(s);
2301
#endif
2302
    /* end of slice reached */
2303
    if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
2304
        /* end of image */
2305

    
2306
        if(s->codec_id == CODEC_ID_MPEG2VIDEO){
2307
            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
        ff_er_frame_end(s);
2312

    
2313
        MPV_frame_end(s);
2314

    
2315
        if (s->pict_type == B_TYPE || s->low_delay) {
2316
            *pict= *(AVFrame*)s->current_picture_ptr;
2317
            ff_print_debug_info(s, pict);
2318
        } else {
2319
            s->picture_number++;
2320
            /* latency of 1 frame for I and P frames */
2321
            /* XXX: use another variable than picture_number */
2322
            if (s->last_picture_ptr != NULL) {
2323
                *pict= *(AVFrame*)s->last_picture_ptr;
2324
                 ff_print_debug_info(s, pict);
2325
            }
2326
        }
2327

    
2328
        return 1;
2329
    } else {
2330
        return 0;
2331
    }
2332
}
2333

    
2334
static int mpeg1_decode_sequence(AVCodecContext *avctx, 
2335
                                 uint8_t *buf, int buf_size)
2336
{
2337
    Mpeg1Context *s1 = avctx->priv_data;
2338
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2339
    int width, height, i, v, j;
2340
    float aspect;
2341

    
2342
    init_get_bits(&s->gb, buf, buf_size*8);
2343

    
2344
    width = get_bits(&s->gb, 12);
2345
    height = get_bits(&s->gb, 12);
2346
    s->aspect_ratio_info= get_bits(&s->gb, 4);
2347
    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

    
2352
    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
    if (get_bits1(&s->gb) == 0) /* marker */
2357
        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
        avctx->has_b_frames= 1;
2371
        s->avctx = avctx;
2372
        avctx->width = width;
2373
        avctx->height = height;
2374
        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
        avctx->bit_rate = s->bit_rate;
2382
        
2383
        //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
            if( avctx->idct_algo == FF_IDCT_AUTO )
2387
                avctx->idct_algo = FF_IDCT_SIMPLE;
2388

    
2389
        if (MPV_common_init(s) < 0)
2390
            return -1;
2391
        s1->mpeg_enc_ctx_allocated = 1;
2392
        s->swap_uv = 0;//just in case vcr2 and mpeg2 stream have been concatinated
2393
    }
2394

    
2395
    s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2396
    skip_bits(&s->gb, 1);
2397

    
2398
    /* get matrix */
2399
    if (get_bits1(&s->gb)) {
2400
        for(i=0;i<64;i++) {
2401
            v = get_bits(&s->gb, 8);
2402
            j = s->intra_scantable.permutated[i];
2403
            s->intra_matrix[j] = v;
2404
            s->chroma_intra_matrix[j] = v;
2405
        }
2406
#ifdef DEBUG
2407
        dprintf("intra matrix present\n");
2408
        for(i=0;i<64;i++)
2409
            dprintf(" %d", s->intra_matrix[s->intra_scantable.permutated[i]]);
2410
        printf("\n");
2411
#endif
2412
    } else {
2413
        for(i=0;i<64;i++) {
2414
            int j= s->dsp.idct_permutation[i];
2415
            v = ff_mpeg1_default_intra_matrix[i];
2416
            s->intra_matrix[j] = v;
2417
            s->chroma_intra_matrix[j] = v;
2418
        }
2419
    }
2420
    if (get_bits1(&s->gb)) {
2421
        for(i=0;i<64;i++) {
2422
            v = get_bits(&s->gb, 8);
2423
            j = s->intra_scantable.permutated[i];
2424
            s->inter_matrix[j] = v;
2425
            s->chroma_inter_matrix[j] = v;
2426
        }
2427
#ifdef DEBUG
2428
        dprintf("non intra matrix present\n");
2429
        for(i=0;i<64;i++)
2430
            dprintf(" %d", s->inter_matrix[s->intra_scantable.permutated[i]]);
2431
        printf("\n");
2432
#endif
2433
    } else {
2434
        for(i=0;i<64;i++) {
2435
            int j= s->dsp.idct_permutation[i];
2436
            v = ff_mpeg1_default_non_intra_matrix[i];
2437
            s->inter_matrix[j] = v;
2438
            s->chroma_inter_matrix[j] = v;
2439
        }
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
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2448
    avctx->sub_id = 1; /* indicates mpeg1 */
2449
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2450
    
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
    return 0;
2456
}
2457

    
2458
static int vcr2_init_sequence(AVCodecContext *avctx)
2459
{
2460
    Mpeg1Context *s1 = avctx->priv_data;
2461
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2462
    int i, v;
2463

    
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
    s->low_delay= 1;
2473
    s->avctx = avctx;
2474

    
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
        if( avctx->idct_algo == FF_IDCT_AUTO )
2479
            avctx->idct_algo = FF_IDCT_SIMPLE;
2480
    
2481
    if (MPV_common_init(s) < 0)
2482
        return -1;
2483
    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
    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
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2503
    avctx->sub_id = 2; /* indicates mpeg2 */
2504
    return 0;
2505
}
2506

    
2507

    
2508
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
/**
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
    return END_NOT_FOUND;
2574
}
2575

    
2576
/* handle buffering and image synchronisation */
2577
static int mpeg_decode_frame(AVCodecContext *avctx, 
2578
                             void *data, int *data_size,
2579
                             uint8_t *buf, int buf_size)
2580
{
2581
    Mpeg1Context *s = avctx->priv_data;
2582
    uint8_t *buf_end, *buf_ptr;
2583
    int ret, start_code, input_size;
2584
    AVFrame *picture = data;
2585
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2586
    dprintf("fill_buffer\n");
2587

    
2588
    *data_size = 0;
2589

    
2590
    /* special case for last picture */
2591
    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

    
2595
        *data_size = sizeof(AVFrame);
2596
        return 0;
2597
    }
2598

    
2599
    if(s2->flags&CODEC_FLAG_TRUNCATED){
2600
        int next= mpeg1_find_frame_end(s2, buf, buf_size);
2601
        
2602
        if( ff_combine_frame(s2, next, &buf, &buf_size) < 0 )
2603
            return buf_size;
2604
    }    
2605
    
2606
    buf_ptr = buf;
2607
    buf_end = buf + buf_size;
2608

    
2609
#if 0    
2610
    if (s->repeat_field % 2 == 1) { 
2611
        s->repeat_field++;
2612
        //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2613
        //        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
    }
2619
#endif
2620

    
2621
    if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2622
        vcr2_init_sequence(avctx);
2623

    
2624
    for(;;) {
2625
        /* find start next code */
2626
        start_code = find_start_code(&buf_ptr, buf_end);
2627
        if (start_code < 0){
2628
            if(s2->pict_type != B_TYPE || avctx->hurry_up==0){
2629
                if (slice_end(avctx, picture)) {
2630
                    if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2631
                        *data_size = sizeof(AVPicture);
2632
                }
2633
            }
2634
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2635
        }
2636
        
2637
        input_size = buf_end - buf_ptr;
2638

    
2639
        if(avctx->debug & FF_DEBUG_STARTCODE){
2640
            av_log(avctx, AV_LOG_DEBUG, "%3X at %d left %d\n", start_code, buf_ptr-buf, input_size);
2641
        }
2642

    
2643
                /* prepare data for next start code */
2644
                switch(start_code) {
2645
                case SEQ_START_CODE:
2646
                    mpeg1_decode_sequence(avctx, buf_ptr, 
2647
                                          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
                                         buf_ptr, input_size);
2654
                    break;
2655
                case EXT_START_CODE:
2656
                    mpeg_decode_extension(avctx,
2657
                                          buf_ptr, input_size);
2658
                    break;
2659
                case USER_START_CODE:
2660
                    mpeg_decode_user_data(avctx, 
2661
                                          buf_ptr, input_size);
2662
                    break;
2663
                case GOP_START_CODE:
2664
                    s2->first_field=0;
2665
                    break;
2666
                default:
2667
                    if (start_code >= SLICE_MIN_START_CODE &&
2668
                        start_code <= SLICE_MAX_START_CODE) {
2669
                        
2670
                        /* skip b frames if we dont have reference frames */
2671
                        if(s2->last_picture_ptr==NULL && s2->pict_type==B_TYPE) break;
2672
                        /* 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
                        
2677
                        if (!s->mpeg_enc_ctx_allocated) break;
2678

    
2679
                        ret = mpeg_decode_slice(avctx, picture,
2680
                                                start_code, &buf_ptr, input_size);
2681
                        emms_c();
2682

    
2683
                        if(ret < 0){
2684
                            if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2685
                                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
                            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
                        }
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
AVCodec mpeg1video_decoder = {
2706
    "mpeg1video",
2707
    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
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2715
    .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
    .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
    .flush= ff_mpeg_flush,
2743
};
2744

    
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
    if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2752
        dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2753
    }
2754
    mpeg_decode_init(avctx);
2755
    s = avctx->priv_data;
2756

    
2757
    avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2758
    avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2759

    
2760
    return 0;
2761
}
2762

    
2763
AVCodec mpeg_xvmc_decoder = {
2764
    "mpegvideo_xvmc",
2765
    CODEC_TYPE_VIDEO,
2766
    CODEC_ID_MPEG2VIDEO_XVMC,
2767
    sizeof(Mpeg1Context),
2768
    mpeg_mc_decode_init,
2769
    NULL,
2770
    mpeg_decode_end,
2771
    mpeg_decode_frame,
2772
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
2773
};
2774

    
2775
#endif
2776

    
2777
/* this is ugly i know, but the alternative is too make 
2778
   hundreds of vars global and prefix them with ff_mpeg1_
2779
   which is far uglier. */
2780
#include "mdec.c"