Statistics
| Branch: | Revision:

ffmpeg / libavcodec / wmv2dec.c @ 199436b9

History | View | Annotate | Download (14.5 KB)

1
/*
2
 * Copyright (c) 2002 The FFmpeg Project.
3
 *
4
 * This file is part of FFmpeg.
5
 *
6
 * FFmpeg is free software; you can redistribute it and/or
7
 * modify it under the terms of the GNU Lesser General Public
8
 * License as published by the Free Software Foundation; either
9
 * version 2.1 of the License, or (at your option) any later version.
10
 *
11
 * FFmpeg is distributed in the hope that it will be useful,
12
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14
 * Lesser General Public License for more details.
15
 *
16
 * You should have received a copy of the GNU Lesser General Public
17
 * License along with FFmpeg; if not, write to the Free Software
18
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19
 */
20

    
21
#include "avcodec.h"
22
#include "dsputil.h"
23
#include "mpegvideo.h"
24
#include "mathops.h"
25
#include "msmpeg4.h"
26
#include "msmpeg4data.h"
27
#include "intrax8.h"
28
#include "wmv2.h"
29

    
30

    
31
static void parse_mb_skip(Wmv2Context * w){
32
    int mb_x, mb_y;
33
    MpegEncContext * const s= &w->s;
34
    uint32_t * const mb_type= s->current_picture_ptr->mb_type;
35

    
36
    w->skip_type= get_bits(&s->gb, 2);
37
    switch(w->skip_type){
38
    case SKIP_TYPE_NONE:
39
        for(mb_y=0; mb_y<s->mb_height; mb_y++){
40
            for(mb_x=0; mb_x<s->mb_width; mb_x++){
41
                mb_type[mb_y*s->mb_stride + mb_x]= MB_TYPE_16x16 | MB_TYPE_L0;
42
            }
43
        }
44
        break;
45
    case SKIP_TYPE_MPEG:
46
        for(mb_y=0; mb_y<s->mb_height; mb_y++){
47
            for(mb_x=0; mb_x<s->mb_width; mb_x++){
48
                mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
49
            }
50
        }
51
        break;
52
    case SKIP_TYPE_ROW:
53
        for(mb_y=0; mb_y<s->mb_height; mb_y++){
54
            if(get_bits1(&s->gb)){
55
                for(mb_x=0; mb_x<s->mb_width; mb_x++){
56
                    mb_type[mb_y*s->mb_stride + mb_x]=  MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
57
                }
58
            }else{
59
                for(mb_x=0; mb_x<s->mb_width; mb_x++){
60
                    mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
61
                }
62
            }
63
        }
64
        break;
65
    case SKIP_TYPE_COL:
66
        for(mb_x=0; mb_x<s->mb_width; mb_x++){
67
            if(get_bits1(&s->gb)){
68
                for(mb_y=0; mb_y<s->mb_height; mb_y++){
69
                    mb_type[mb_y*s->mb_stride + mb_x]=  MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
70
                }
71
            }else{
72
                for(mb_y=0; mb_y<s->mb_height; mb_y++){
73
                    mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
74
                }
75
            }
76
        }
77
        break;
78
    }
79
}
80

    
81
static int decode_ext_header(Wmv2Context *w){
82
    MpegEncContext * const s= &w->s;
83
    GetBitContext gb;
84
    int fps;
85
    int code;
86

    
87
    if(s->avctx->extradata_size<4) return -1;
88

    
89
    init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
90

    
91
    fps                = get_bits(&gb, 5);
92
    s->bit_rate        = get_bits(&gb, 11)*1024;
93
    w->mspel_bit       = get_bits1(&gb);
94
    s->loop_filter     = get_bits1(&gb);
95
    w->abt_flag        = get_bits1(&gb);
96
    w->j_type_bit      = get_bits1(&gb);
97
    w->top_left_mv_flag= get_bits1(&gb);
98
    w->per_mb_rl_bit   = get_bits1(&gb);
99
    code               = get_bits(&gb, 3);
100

    
101
    if(code==0) return -1;
102

    
103
    s->slice_height = s->mb_height / code;
104

    
105
    if(s->avctx->debug&FF_DEBUG_PICT_INFO){
106
        av_log(s->avctx, AV_LOG_DEBUG, "fps:%d, br:%d, qpbit:%d, abt_flag:%d, j_type_bit:%d, tl_mv_flag:%d, mbrl_bit:%d, code:%d, loop_filter:%d, slices:%d\n",
107
        fps, s->bit_rate, w->mspel_bit, w->abt_flag, w->j_type_bit, w->top_left_mv_flag, w->per_mb_rl_bit, code, s->loop_filter,
108
        code);
109
    }
110
    return 0;
111
}
112

    
113
int ff_wmv2_decode_picture_header(MpegEncContext * s)
114
{
115
    Wmv2Context * const w= (Wmv2Context*)s;
116
    int code;
117

    
118
#if 0
119
{
120
int i;
121
for(i=0; i<s->gb.size*8; i++)
122
    printf("%d", get_bits1(&s->gb));
123
//    get_bits1(&s->gb);
124
printf("END\n");
125
return -1;
126
}
127
#endif
128
    if(s->picture_number==0)
129
        decode_ext_header(w);
130

    
131
    s->pict_type = get_bits1(&s->gb) + 1;
132
    if(s->pict_type == FF_I_TYPE){
133
        code = get_bits(&s->gb, 7);
134
        av_log(s->avctx, AV_LOG_DEBUG, "I7:%X/\n", code);
135
    }
136
    s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
137
    if(s->qscale <= 0)
138
       return -1;
139

    
140
    return 0;
141
}
142

    
143
int ff_wmv2_decode_secondary_picture_header(MpegEncContext * s)
144
{
145
    Wmv2Context * const w= (Wmv2Context*)s;
146

    
147
    if (s->pict_type == FF_I_TYPE) {
148
        if(w->j_type_bit) w->j_type= get_bits1(&s->gb);
149
        else              w->j_type= 0; //FIXME check
150

    
151
        if(!w->j_type){
152
            if(w->per_mb_rl_bit) s->per_mb_rl_table= get_bits1(&s->gb);
153
            else                 s->per_mb_rl_table= 0;
154

    
155
            if(!s->per_mb_rl_table){
156
                s->rl_chroma_table_index = decode012(&s->gb);
157
                s->rl_table_index = decode012(&s->gb);
158
            }
159

    
160
            s->dc_table_index = get_bits1(&s->gb);
161
        }
162
        s->inter_intra_pred= 0;
163
        s->no_rounding = 1;
164
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
165
            av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d j_type:%d \n",
166
                s->qscale,
167
                s->rl_chroma_table_index,
168
                s->rl_table_index,
169
                s->dc_table_index,
170
                s->per_mb_rl_table,
171
                w->j_type);
172
        }
173
    }else{
174
        int cbp_index;
175
        w->j_type=0;
176

    
177
        parse_mb_skip(w);
178
        cbp_index= decode012(&s->gb);
179
        if(s->qscale <= 10){
180
            int map[3]= {0,2,1};
181
            w->cbp_table_index= map[cbp_index];
182
        }else if(s->qscale <= 20){
183
            int map[3]= {1,0,2};
184
            w->cbp_table_index= map[cbp_index];
185
        }else{
186
            int map[3]= {2,1,0};
187
            w->cbp_table_index= map[cbp_index];
188
        }
189

    
190
        if(w->mspel_bit) s->mspel= get_bits1(&s->gb);
191
        else             s->mspel= 0; //FIXME check
192

    
193
        if(w->abt_flag){
194
            w->per_mb_abt= get_bits1(&s->gb)^1;
195
            if(!w->per_mb_abt){
196
                w->abt_type= decode012(&s->gb);
197
            }
198
        }
199

    
200
        if(w->per_mb_rl_bit) s->per_mb_rl_table= get_bits1(&s->gb);
201
        else                 s->per_mb_rl_table= 0;
202

    
203
        if(!s->per_mb_rl_table){
204
            s->rl_table_index = decode012(&s->gb);
205
            s->rl_chroma_table_index = s->rl_table_index;
206
        }
207

    
208
        s->dc_table_index = get_bits1(&s->gb);
209
        s->mv_table_index = get_bits1(&s->gb);
210

    
211
        s->inter_intra_pred= 0;//(s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
212
        s->no_rounding ^= 1;
213

    
214
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
215
            av_log(s->avctx, AV_LOG_DEBUG, "rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d mspel:%d per_mb_abt:%d abt_type:%d cbp:%d ii:%d\n",
216
                s->rl_table_index,
217
                s->rl_chroma_table_index,
218
                s->dc_table_index,
219
                s->mv_table_index,
220
                s->per_mb_rl_table,
221
                s->qscale,
222
                s->mspel,
223
                w->per_mb_abt,
224
                w->abt_type,
225
                w->cbp_table_index,
226
                s->inter_intra_pred);
227
        }
228
    }
229
    s->esc3_level_length= 0;
230
    s->esc3_run_length= 0;
231

    
232
s->picture_number++; //FIXME ?
233

    
234

    
235
    if(w->j_type){
236
        ff_intrax8_decode_picture(&w->x8, 2*s->qscale, (s->qscale-1)|1 );
237
        return 1;
238
    }
239

    
240
    return 0;
241
}
242

    
243
static inline int wmv2_decode_motion(Wmv2Context *w, int *mx_ptr, int *my_ptr){
244
    MpegEncContext * const s= &w->s;
245
    int ret;
246

    
247
    ret= ff_msmpeg4_decode_motion(s, mx_ptr, my_ptr);
248

    
249
    if(ret<0) return -1;
250

    
251
    if((((*mx_ptr)|(*my_ptr)) & 1) && s->mspel)
252
        w->hshift= get_bits1(&s->gb);
253
    else
254
        w->hshift= 0;
255

    
256
//printf("%d %d  ", *mx_ptr, *my_ptr);
257

    
258
    return 0;
259
}
260

    
261
static int16_t *wmv2_pred_motion(Wmv2Context *w, int *px, int *py){
262
    MpegEncContext * const s= &w->s;
263
    int xy, wrap, diff, type;
264
    int16_t *A, *B, *C, *mot_val;
265

    
266
    wrap = s->b8_stride;
267
    xy = s->block_index[0];
268

    
269
    mot_val = s->current_picture.motion_val[0][xy];
270

    
271
    A = s->current_picture.motion_val[0][xy - 1];
272
    B = s->current_picture.motion_val[0][xy - wrap];
273
    C = s->current_picture.motion_val[0][xy + 2 - wrap];
274

    
275
    if(s->mb_x && !s->first_slice_line && !s->mspel && w->top_left_mv_flag)
276
        diff= FFMAX(FFABS(A[0] - B[0]), FFABS(A[1] - B[1]));
277
    else
278
        diff=0;
279

    
280
    if(diff >= 8)
281
        type= get_bits1(&s->gb);
282
    else
283
        type= 2;
284

    
285
    if(type == 0){
286
        *px= A[0];
287
        *py= A[1];
288
    }else if(type == 1){
289
        *px= B[0];
290
        *py= B[1];
291
    }else{
292
        /* special case for first (slice) line */
293
        if (s->first_slice_line) {
294
            *px = A[0];
295
            *py = A[1];
296
        } else {
297
            *px = mid_pred(A[0], B[0], C[0]);
298
            *py = mid_pred(A[1], B[1], C[1]);
299
        }
300
    }
301

    
302
    return mot_val;
303
}
304

    
305
static inline int wmv2_decode_inter_block(Wmv2Context *w, DCTELEM *block, int n, int cbp){
306
    MpegEncContext * const s= &w->s;
307
    static const int sub_cbp_table[3]= {2,3,1};
308
    int sub_cbp;
309

    
310
    if(!cbp){
311
        s->block_last_index[n] = -1;
312

    
313
        return 0;
314
    }
315

    
316
    if(w->per_block_abt)
317
        w->abt_type= decode012(&s->gb);
318
#if 0
319
    if(w->per_block_abt)
320
        printf("B%d", w->abt_type);
321
#endif
322
    w->abt_type_table[n]= w->abt_type;
323

    
324
    if(w->abt_type){
325
//        const uint8_t *scantable= w->abt_scantable[w->abt_type-1].permutated;
326
        const uint8_t *scantable= w->abt_scantable[w->abt_type-1].scantable;
327
//        const uint8_t *scantable= w->abt_type-1 ? w->abt_scantable[1].permutated : w->abt_scantable[0].scantable;
328

    
329
        sub_cbp= sub_cbp_table[ decode012(&s->gb) ];
330
//        printf("S%d", sub_cbp);
331

    
332
        if(sub_cbp&1){
333
            if (ff_msmpeg4_decode_block(s, block, n, 1, scantable) < 0)
334
                return -1;
335
        }
336

    
337
        if(sub_cbp&2){
338
            if (ff_msmpeg4_decode_block(s, w->abt_block2[n], n, 1, scantable) < 0)
339
                return -1;
340
        }
341
        s->block_last_index[n] = 63;
342

    
343
        return 0;
344
    }else{
345
        return ff_msmpeg4_decode_block(s, block, n, 1, s->inter_scantable.permutated);
346
    }
347
}
348

    
349

    
350
int ff_wmv2_decode_mb(MpegEncContext *s, DCTELEM block[6][64])
351
{
352
    Wmv2Context * const w= (Wmv2Context*)s;
353
    int cbp, code, i;
354
    uint8_t *coded_val;
355

    
356
    if(w->j_type) return 0;
357

    
358
    if (s->pict_type == FF_P_TYPE) {
359
        if(IS_SKIP(s->current_picture.mb_type[s->mb_y * s->mb_stride + s->mb_x])){
360
            /* skip mb */
361
            s->mb_intra = 0;
362
            for(i=0;i<6;i++)
363
                s->block_last_index[i] = -1;
364
            s->mv_dir = MV_DIR_FORWARD;
365
            s->mv_type = MV_TYPE_16X16;
366
            s->mv[0][0][0] = 0;
367
            s->mv[0][0][1] = 0;
368
            s->mb_skipped = 1;
369
            w->hshift=0;
370
            return 0;
371
        }
372

    
373
        code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[w->cbp_table_index].table, MB_NON_INTRA_VLC_BITS, 3);
374
        if (code < 0)
375
            return -1;
376
        s->mb_intra = (~code & 0x40) >> 6;
377

    
378
        cbp = code & 0x3f;
379
    } else {
380
        s->mb_intra = 1;
381
        code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
382
        if (code < 0){
383
            av_log(s->avctx, AV_LOG_ERROR, "II-cbp illegal at %d %d\n", s->mb_x, s->mb_y);
384
            return -1;
385
        }
386
        /* predict coded block pattern */
387
        cbp = 0;
388
        for(i=0;i<6;i++) {
389
            int val = ((code >> (5 - i)) & 1);
390
            if (i < 4) {
391
                int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
392
                val = val ^ pred;
393
                *coded_val = val;
394
            }
395
            cbp |= val << (5 - i);
396
        }
397
    }
398

    
399
    if (!s->mb_intra) {
400
        int mx, my;
401
//printf("P at %d %d\n", s->mb_x, s->mb_y);
402
        wmv2_pred_motion(w, &mx, &my);
403

    
404
        if(cbp){
405
            s->dsp.clear_blocks(s->block[0]);
406
            if(s->per_mb_rl_table){
407
                s->rl_table_index = decode012(&s->gb);
408
                s->rl_chroma_table_index = s->rl_table_index;
409
            }
410

    
411
            if(w->abt_flag && w->per_mb_abt){
412
                w->per_block_abt= get_bits1(&s->gb);
413
                if(!w->per_block_abt)
414
                    w->abt_type= decode012(&s->gb);
415
            }else
416
                w->per_block_abt=0;
417
        }
418

    
419
        if (wmv2_decode_motion(w, &mx, &my) < 0)
420
            return -1;
421

    
422
        s->mv_dir = MV_DIR_FORWARD;
423
        s->mv_type = MV_TYPE_16X16;
424
        s->mv[0][0][0] = mx;
425
        s->mv[0][0][1] = my;
426

    
427
        for (i = 0; i < 6; i++) {
428
            if (wmv2_decode_inter_block(w, block[i], i, (cbp >> (5 - i)) & 1) < 0)
429
            {
430
                av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding inter block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
431
                return -1;
432
            }
433
        }
434
    } else {
435
//if(s->pict_type==FF_P_TYPE)
436
//   printf("%d%d ", s->inter_intra_pred, cbp);
437
//printf("I at %d %d %d %06X\n", s->mb_x, s->mb_y, ((cbp&3)? 1 : 0) +((cbp&0x3C)? 2 : 0), show_bits(&s->gb, 24));
438
        s->ac_pred = get_bits1(&s->gb);
439
        if(s->inter_intra_pred){
440
            s->h263_aic_dir= get_vlc2(&s->gb, ff_inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1);
441
//            printf("%d%d %d %d/", s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
442
        }
443
        if(s->per_mb_rl_table && cbp){
444
            s->rl_table_index = decode012(&s->gb);
445
            s->rl_chroma_table_index = s->rl_table_index;
446
        }
447

    
448
        s->dsp.clear_blocks(s->block[0]);
449
        for (i = 0; i < 6; i++) {
450
            if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
451
            {
452
                av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding intra block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
453
                return -1;
454
            }
455
        }
456
    }
457

    
458
    return 0;
459
}
460

    
461
static av_cold int wmv2_decode_init(AVCodecContext *avctx){
462
    Wmv2Context * const w= avctx->priv_data;
463

    
464
    if(avctx->idct_algo==FF_IDCT_AUTO){
465
        avctx->idct_algo=FF_IDCT_WMV2;
466
    }
467

    
468
    if(ff_h263_decode_init(avctx) < 0)
469
        return -1;
470

    
471
    ff_wmv2_common_init(w);
472

    
473
    ff_intrax8_common_init(&w->x8,&w->s);
474

    
475
    return 0;
476
}
477

    
478
static av_cold int wmv2_decode_end(AVCodecContext *avctx)
479
{
480
    Wmv2Context *w = avctx->priv_data;
481

    
482
    ff_intrax8_common_end(&w->x8);
483
    return ff_h263_decode_end(avctx);
484
}
485

    
486
AVCodec wmv2_decoder = {
487
    "wmv2",
488
    CODEC_TYPE_VIDEO,
489
    CODEC_ID_WMV2,
490
    sizeof(Wmv2Context),
491
    wmv2_decode_init,
492
    NULL,
493
    wmv2_decode_end,
494
    ff_h263_decode_frame,
495
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
496
    .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
497
};