GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/h263dec.c Lines: 282 418 67.5 %
Date: 2019-11-22 03:34:36 Branches: 207 389 53.2 %

Line Branch Exec Source
1
/*
2
 * H.263 decoder
3
 * Copyright (c) 2001 Fabrice Bellard
4
 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5
 *
6
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2.1 of the License, or (at your option) any later version.
12
 *
13
 * FFmpeg is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * Lesser General Public License for more details.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
19
 * License along with FFmpeg; if not, write to the Free Software
20
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22
23
/**
24
 * @file
25
 * H.263 decoder.
26
 */
27
28
#define UNCHECKED_BITSTREAM_READER 1
29
30
#include "libavutil/cpu.h"
31
#include "avcodec.h"
32
#include "error_resilience.h"
33
#include "flv.h"
34
#include "h263.h"
35
#include "h263_parser.h"
36
#include "hwaccel.h"
37
#include "internal.h"
38
#include "mpeg_er.h"
39
#include "mpeg4video.h"
40
#include "mpeg4video_parser.h"
41
#include "mpegutils.h"
42
#include "mpegvideo.h"
43
#include "msmpeg4.h"
44
#include "qpeldsp.h"
45
#include "thread.h"
46
#include "wmv2.h"
47
48
320
static enum AVPixelFormat h263_get_format(AVCodecContext *avctx)
49
{
50
    /* MPEG-4 Studio Profile only, not supported by hardware */
51
320
    if (avctx->bits_per_raw_sample > 8) {
52
        av_assert1(((MpegEncContext *)avctx->priv_data)->studio_profile);
53
        return avctx->pix_fmt;
54
    }
55
56
320
    if (avctx->codec->id == AV_CODEC_ID_MSS2)
57
10
        return AV_PIX_FMT_YUV420P;
58
59
    if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY)) {
60
        if (avctx->color_range == AVCOL_RANGE_UNSPECIFIED)
61
            avctx->color_range = AVCOL_RANGE_MPEG;
62
        return AV_PIX_FMT_GRAY8;
63
    }
64
65
310
    return avctx->pix_fmt = ff_get_format(avctx, avctx->codec->pix_fmts);
66
}
67
68
282
av_cold int ff_h263_decode_init(AVCodecContext *avctx)
69
{
70
282
    MpegEncContext *s = avctx->priv_data;
71
    int ret;
72
73
282
    s->out_format      = FMT_H263;
74
75
    // set defaults
76
282
    ff_mpv_decode_defaults(s);
77
282
    ff_mpv_decode_init(s, avctx);
78
79
282
    s->quant_precision = 5;
80
282
    s->decode_mb       = ff_h263_decode_mb;
81
282
    s->low_delay       = 1;
82
282
    s->unrestricted_mv = 1;
83
84
    /* select sub codec */
85


282
    switch (avctx->codec->id) {
86
20
    case AV_CODEC_ID_H263:
87
    case AV_CODEC_ID_H263P:
88
20
        s->unrestricted_mv = 0;
89
20
        avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
90
20
        break;
91
157
    case AV_CODEC_ID_MPEG4:
92
157
        break;
93
2
    case AV_CODEC_ID_MSMPEG4V1:
94
2
        s->h263_pred       = 1;
95
2
        s->msmpeg4_version = 1;
96
2
        break;
97
9
    case AV_CODEC_ID_MSMPEG4V2:
98
9
        s->h263_pred       = 1;
99
9
        s->msmpeg4_version = 2;
100
9
        break;
101
13
    case AV_CODEC_ID_MSMPEG4V3:
102
13
        s->h263_pred       = 1;
103
13
        s->msmpeg4_version = 3;
104
13
        break;
105
9
    case AV_CODEC_ID_WMV1:
106
9
        s->h263_pred       = 1;
107
9
        s->msmpeg4_version = 4;
108
9
        break;
109
12
    case AV_CODEC_ID_WMV2:
110
12
        s->h263_pred       = 1;
111
12
        s->msmpeg4_version = 5;
112
12
        break;
113
42
    case AV_CODEC_ID_VC1:
114
    case AV_CODEC_ID_WMV3:
115
    case AV_CODEC_ID_VC1IMAGE:
116
    case AV_CODEC_ID_WMV3IMAGE:
117
    case AV_CODEC_ID_MSS2:
118
42
        s->h263_pred       = 1;
119
42
        s->msmpeg4_version = 6;
120
42
        avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
121
42
        break;
122
    case AV_CODEC_ID_H263I:
123
        break;
124
18
    case AV_CODEC_ID_FLV1:
125
18
        s->h263_flv = 1;
126
18
        break;
127
    default:
128
        av_log(avctx, AV_LOG_ERROR, "Unsupported codec %d\n",
129
               avctx->codec->id);
130
        return AVERROR(ENOSYS);
131
    }
132
282
    s->codec_id    = avctx->codec->id;
133
134

282
    if (avctx->codec_tag == AV_RL32("L263") || avctx->codec_tag == AV_RL32("S263"))
135
        if (avctx->extradata_size == 56 && avctx->extradata[0] == 1)
136
            s->ehc_mode = 1;
137
138
    /* for H.263, we allocate the images after having read the header */
139
282
    if (avctx->codec->id != AV_CODEC_ID_H263 &&
140
262
        avctx->codec->id != AV_CODEC_ID_H263P &&
141
262
        avctx->codec->id != AV_CODEC_ID_MPEG4) {
142
105
        avctx->pix_fmt = h263_get_format(avctx);
143
105
        ff_mpv_idct_init(s);
144
105
        if ((ret = ff_mpv_common_init(s)) < 0)
145
            return ret;
146
    }
147
148
282
    ff_h263dsp_init(&s->h263dsp);
149
282
    ff_qpeldsp_init(&s->qdsp);
150
282
    ff_h263_decode_init_vlc();
151
152
282
    return 0;
153
}
154
155
240
av_cold int ff_h263_decode_end(AVCodecContext *avctx)
156
{
157
240
    MpegEncContext *s = avctx->priv_data;
158
159
240
    ff_mpv_common_end(s);
160
240
    return 0;
161
}
162
163
/**
164
 * Return the number of bytes consumed for building the current frame.
165
 */
166
5672
static int get_consumed_bytes(MpegEncContext *s, int buf_size)
167
{
168
5672
    int pos = (get_bits_count(&s->gb) + 7) >> 3;
169
170

5672
    if (s->divx_packed || s->avctx->hwaccel) {
171
        /* We would have to scan through the whole buf to handle the weird
172
         * reordering ... */
173
17
        return buf_size;
174
5655
    } else if (s->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
175
        pos -= s->parse_context.last_index;
176
        // padding is not really read so this might be -1
177
        if (pos < 0)
178
            pos = 0;
179
        return pos;
180
    } else {
181
        // avoid infinite loops (maybe not needed...)
182
5655
        if (pos == 0)
183
            pos = 1;
184
        // oops ;)
185
5655
        if (pos + 10 > buf_size)
186
5498
            pos = buf_size;
187
188
5655
        return pos;
189
    }
190
}
191
192
11921
static int decode_slice(MpegEncContext *s)
193
{
194
23842
    const int part_mask = s->partitioned_frame
195
11921
                          ? (ER_AC_END | ER_AC_ERROR) : 0x7F;
196
11921
    const int mb_size   = 16 >> s->avctx->lowres;
197
    int ret;
198
199
11921
    s->last_resync_gb   = s->gb;
200
11921
    s->first_slice_line = 1;
201
11921
    s->resync_mb_x      = s->mb_x;
202
11921
    s->resync_mb_y      = s->mb_y;
203
204
11921
    ff_set_qscale(s, s->qscale);
205
206
11921
    if (s->studio_profile) {
207
        if ((ret = ff_mpeg4_decode_studio_slice_header(s->avctx->priv_data)) < 0)
208
            return ret;
209
    }
210
211
11921
    if (s->avctx->hwaccel) {
212
        const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8;
213
        ret = s->avctx->hwaccel->decode_slice(s->avctx, start, s->gb.buffer_end - start);
214
        // ensure we exit decode loop
215
        s->mb_y = s->mb_height;
216
        return ret;
217
    }
218
219
11921
    if (s->partitioned_frame) {
220
1728
        const int qscale = s->qscale;
221
222
1728
        if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4)
223
1728
            if ((ret = ff_mpeg4_decode_partitions(s->avctx->priv_data)) < 0)
224
                return ret;
225
226
        /* restore variables which were modified */
227
1728
        s->first_slice_line = 1;
228
1728
        s->mb_x             = s->resync_mb_x;
229
1728
        s->mb_y             = s->resync_mb_y;
230
1728
        ff_set_qscale(s, qscale);
231
    }
232
233
94877
    for (; s->mb_y < s->mb_height; s->mb_y++) {
234
        /* per-row end of slice checks */
235
93531
        if (s->msmpeg4_version) {
236
19665
            if (s->resync_mb_y + s->slice_height == s->mb_y) {
237
                ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
238
                                s->mb_x - 1, s->mb_y, ER_MB_END);
239
240
                return 0;
241
            }
242
        }
243
244
93531
        if (s->msmpeg4_version == 1) {
245
750
            s->last_dc[0] =
246
750
            s->last_dc[1] =
247
750
            s->last_dc[2] = 128;
248
        }
249
250
93531
        ff_init_block_index(s);
251
2228486
        for (; s->mb_x < s->mb_width; s->mb_x++) {
252
            int ret;
253
254
2145530
            ff_update_block_index(s);
255
256

2145530
            if (s->resync_mb_x == s->mb_x && s->resync_mb_y + 1 == s->mb_y)
257
7352
                s->first_slice_line = 0;
258
259
            /* DCT & quantize */
260
261
2145530
            s->mv_dir  = MV_DIR_FORWARD;
262
2145530
            s->mv_type = MV_TYPE_16X16;
263
            ff_dlog(s, "%d %06X\n",
264
                    get_bits_count(&s->gb), show_bits(&s->gb, 24));
265
266
            ff_tlog(NULL, "Decoding MB at %dx%d\n", s->mb_x, s->mb_y);
267
2145530
            ret = s->decode_mb(s, s->block);
268
269
2145530
            if (s->pict_type != AV_PICTURE_TYPE_B)
270
1908706
                ff_h263_update_motion_val(s);
271
272
2145530
            if (ret < 0) {
273
10575
                const int xy = s->mb_x + s->mb_y * s->mb_stride;
274
10575
                if (ret == SLICE_END) {
275
10575
                    ff_mpv_reconstruct_mb(s, s->block);
276
10575
                    if (s->loop_filter)
277
                        ff_h263_loop_filter(s);
278
279
10575
                    ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
280
                                    s->mb_x, s->mb_y, ER_MB_END & part_mask);
281
282
10575
                    s->padding_bug_score--;
283
284
10575
                    if (++s->mb_x >= s->mb_width) {
285
7622
                        s->mb_x = 0;
286
7622
                        ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
287
7622
                        ff_mpv_report_decode_progress(s);
288
7622
                        s->mb_y++;
289
                    }
290
10575
                    return 0;
291
                } else if (ret == SLICE_NOEND) {
292
                    av_log(s->avctx, AV_LOG_ERROR,
293
                           "Slice mismatch at MB: %d\n", xy);
294
                    ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
295
                                    s->mb_x + 1, s->mb_y,
296
                                    ER_MB_END & part_mask);
297
                    return AVERROR_INVALIDDATA;
298
                }
299
                av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
300
                ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
301
                                s->mb_x, s->mb_y, ER_MB_ERROR & part_mask);
302
303
                if (s->avctx->err_recognition & AV_EF_IGNORE_ERR)
304
                    continue;
305
                return AVERROR_INVALIDDATA;
306
            }
307
308
2134955
            ff_mpv_reconstruct_mb(s, s->block);
309
2134955
            if (s->loop_filter)
310
141300
                ff_h263_loop_filter(s);
311
        }
312
313
82956
        ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
314
82956
        ff_mpv_report_decode_progress(s);
315
316
82956
        s->mb_x = 0;
317
    }
318
319
    av_assert1(s->mb_x == 0 && s->mb_y == s->mb_height);
320
321
    // Detect incorrect padding with wrong stuffing codes used by NEC N-02B
322
1346
    if (s->codec_id == AV_CODEC_ID_MPEG4         &&
323
        (s->workaround_bugs & FF_BUG_AUTODETECT) &&
324
        get_bits_left(&s->gb) >= 48              &&
325
        show_bits(&s->gb, 24) == 0x4010          &&
326
        !s->data_partitioning)
327
        s->padding_bug_score += 32;
328
329
    /* try to detect the padding bug */
330
1346
    if (s->codec_id == AV_CODEC_ID_MPEG4         &&
331
        (s->workaround_bugs & FF_BUG_AUTODETECT) &&
332
        get_bits_left(&s->gb) >= 0               &&
333
        get_bits_left(&s->gb) < 137              &&
334
        !s->data_partitioning) {
335
        const int bits_count = get_bits_count(&s->gb);
336
        const int bits_left  = s->gb.size_in_bits - bits_count;
337
338
        if (bits_left == 0) {
339
            s->padding_bug_score += 16;
340
        } else if (bits_left != 1) {
341
            int v = show_bits(&s->gb, 8);
342
            v |= 0x7F >> (7 - (bits_count & 7));
343
344
            if (v == 0x7F && bits_left <= 8)
345
                s->padding_bug_score--;
346
            else if (v == 0x7F && ((get_bits_count(&s->gb) + 8) & 8) &&
347
                     bits_left <= 16)
348
                s->padding_bug_score += 4;
349
            else
350
                s->padding_bug_score++;
351
        }
352
    }
353
354
1346
    if (s->codec_id == AV_CODEC_ID_H263          &&
355
        (s->workaround_bugs & FF_BUG_AUTODETECT) &&
356
        get_bits_left(&s->gb) >= 8               &&
357
        get_bits_left(&s->gb) < 300              &&
358
        s->pict_type == AV_PICTURE_TYPE_I        &&
359
        show_bits(&s->gb, 8) == 0                &&
360
        !s->data_partitioning) {
361
362
        s->padding_bug_score += 32;
363
    }
364
365
1346
    if (s->codec_id == AV_CODEC_ID_H263          &&
366
        (s->workaround_bugs & FF_BUG_AUTODETECT) &&
367
        get_bits_left(&s->gb) >= 64              &&
368
        AV_RB64(s->gb.buffer_end - 8) == 0xCDCDCDCDFC7F0000) {
369
370
        s->padding_bug_score += 32;
371
    }
372
373
1346
    if (s->workaround_bugs & FF_BUG_AUTODETECT) {
374
1346
        if (
375

1346
            (s->padding_bug_score > -2 && !s->data_partitioning))
376
1346
            s->workaround_bugs |= FF_BUG_NO_PADDING;
377
        else
378
            s->workaround_bugs &= ~FF_BUG_NO_PADDING;
379
    }
380
381
    // handle formats which don't have unique end markers
382

1346
    if (s->msmpeg4_version || (s->workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly
383
1346
        int left      = get_bits_left(&s->gb);
384
1346
        int max_extra = 7;
385
386
        /* no markers in M$ crap */
387

1346
        if (s->msmpeg4_version && s->pict_type == AV_PICTURE_TYPE_I)
388
90
            max_extra += 17;
389
390
        /* buggy padding but the frame should still end approximately at
391
         * the bitstream end */
392
1346
        if ((s->workaround_bugs & FF_BUG_NO_PADDING) &&
393
1346
            (s->avctx->err_recognition & (AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
394
            max_extra += 48;
395
1346
        else if ((s->workaround_bugs & FF_BUG_NO_PADDING))
396
1346
            max_extra += 256 * 256 * 256 * 64;
397
398
1346
        if (left > max_extra)
399
            av_log(s->avctx, AV_LOG_ERROR,
400
                   "discarding %d junk bits at end, next would be %X\n",
401
                   left, show_bits(&s->gb, 24));
402
1346
        else if (left < 0)
403
            av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
404
        else
405
1346
            ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
406
1346
                            s->mb_x - 1, s->mb_y, ER_MB_END);
407
408
1346
        return 0;
409
    }
410
411
    av_log(s->avctx, AV_LOG_ERROR,
412
           "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
413
           get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score);
414
415
    ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
416
                    ER_MB_END & part_mask);
417
418
    return AVERROR_INVALIDDATA;
419
}
420
421
5771
int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
422
                         AVPacket *avpkt)
423
{
424
5771
    const uint8_t *buf = avpkt->data;
425
5771
    int buf_size       = avpkt->size;
426
5771
    MpegEncContext *s  = avctx->priv_data;
427
    int ret;
428
5771
    int slice_ret = 0;
429
5771
    AVFrame *pict = data;
430
431
    /* no supplementary picture */
432
5771
    if (buf_size == 0) {
433
        /* special case for last picture */
434

99
        if (s->low_delay == 0 && s->next_picture_ptr) {
435
24
            if ((ret = av_frame_ref(pict, s->next_picture_ptr->f)) < 0)
436
                return ret;
437
24
            s->next_picture_ptr = NULL;
438
439
24
            *got_frame = 1;
440
        }
441
442
99
        return 0;
443
    }
444
445
5672
    if (s->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
446
        int next;
447
448
        if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4) {
449
            next = ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
450
        } else if (CONFIG_H263_DECODER && s->codec_id == AV_CODEC_ID_H263) {
451
            next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
452
        } else if (CONFIG_H263P_DECODER && s->codec_id == AV_CODEC_ID_H263P) {
453
            next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
454
        } else {
455
            av_log(s->avctx, AV_LOG_ERROR,
456
                   "this codec does not support truncated bitstreams\n");
457
            return AVERROR(ENOSYS);
458
        }
459
460
        if (ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf,
461
                             &buf_size) < 0)
462
            return buf_size;
463
    }
464
465
5672
retry:
466

5676
    if (s->divx_packed && s->bitstream_buffer_size) {
467
        int i;
468
7
        for(i=0; i < buf_size-3; i++) {
469

7
            if (buf[i]==0 && buf[i+1]==0 && buf[i+2]==1) {
470
7
                if (buf[i+3]==0xB0) {
471
                    av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
472
                    s->bitstream_buffer_size = 0;
473
                }
474
7
                break;
475
            }
476
        }
477
    }
478
479

5676
    if (s->bitstream_buffer_size && (s->divx_packed || buf_size <= MAX_NVOP_SIZE)) // divx 5.01+/xvid frame reorder
480
7
        ret = init_get_bits8(&s->gb, s->bitstream_buffer,
481
                             s->bitstream_buffer_size);
482
    else
483
5669
        ret = init_get_bits8(&s->gb, buf, buf_size);
484
485
5676
    s->bitstream_buffer_size = 0;
486
5676
    if (ret < 0)
487
        return ret;
488
489
5676
    if (!s->context_initialized)
490
        // we need the idct permutation for reading a custom matrix
491
177
        ff_mpv_idct_init(s);
492
493
    /* let's go :-) */
494
5676
    if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
495
674
        ret = ff_wmv2_decode_picture_header(s);
496
5002
    } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
497
675
        ret = ff_msmpeg4_decode_picture_header(s);
498
4327
    } else if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
499

3452
        if (s->avctx->extradata_size && s->picture_number == 0) {
500
            GetBitContext gb;
501
502
155
            if (init_get_bits8(&gb, s->avctx->extradata, s->avctx->extradata_size) >= 0 )
503
155
                ff_mpeg4_decode_picture_header(avctx->priv_data, &gb, 1);
504
        }
505
3452
        ret = ff_mpeg4_decode_picture_header(avctx->priv_data, &s->gb, 0);
506
875
    } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
507
        ret = ff_intel_h263_decode_picture_header(s);
508
875
    } else if (CONFIG_FLV_DECODER && s->h263_flv) {
509
414
        ret = ff_flv_decode_picture_header(s);
510
    } else {
511
461
        ret = ff_h263_decode_picture_header(s);
512
    }
513
514

5676
    if (ret < 0 || ret == FRAME_SKIPPED) {
515
        if (   s->width  != avctx->coded_width
516
            || s->height != avctx->coded_height) {
517
                av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
518
                s->width = avctx->coded_width;
519
                s->height= avctx->coded_height;
520
        }
521
    }
522
5676
    if (ret == FRAME_SKIPPED)
523
        return get_consumed_bytes(s, buf_size);
524
525
    /* skip if the header was thrashed */
526
5676
    if (ret < 0) {
527
        av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
528
        return ret;
529
    }
530
531
5676
    if (!s->context_initialized) {
532
177
        avctx->pix_fmt = h263_get_format(avctx);
533
177
        if ((ret = ff_mpv_common_init(s)) < 0)
534
            return ret;
535
    }
536
537

5676
    if (!s->current_picture_ptr || s->current_picture_ptr->f->data[0]) {
538
5626
        int i = ff_find_unused_picture(s->avctx, s->picture, 0);
539
5626
        if (i < 0)
540
            return i;
541
5626
        s->current_picture_ptr = &s->picture[i];
542
    }
543
544
5676
    avctx->has_b_frames = !s->low_delay;
545
546
5676
    if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
547
3452
        if (ff_mpeg4_workaround_bugs(avctx) == 1)
548
4
            goto retry;
549
3448
        if (s->studio_profile != (s->idsp.idct == NULL))
550
            ff_mpv_idct_init(s);
551
    }
552
553
    /* After H.263 & MPEG-4 header decode we have the height, width,
554
     * and other parameters. So then we could init the picture.
555
     * FIXME: By the way H.263 decoder is evolving it should have
556
     * an H263EncContext */
557
5672
    if (s->width  != avctx->coded_width  ||
558
5634
        s->height != avctx->coded_height ||
559
5634
        s->context_reinit) {
560
        /* H.263 could change picture size any time */
561
38
        s->context_reinit = 0;
562
563
38
        ret = ff_set_dimensions(avctx, s->width, s->height);
564
38
        if (ret < 0)
565
            return ret;
566
567
38
        ff_set_sar(avctx, avctx->sample_aspect_ratio);
568
569
38
        if ((ret = ff_mpv_common_frame_size_change(s)))
570
            return ret;
571
572
38
        if (avctx->pix_fmt != h263_get_format(avctx)) {
573
            av_log(avctx, AV_LOG_ERROR, "format change not supported\n");
574
            avctx->pix_fmt = AV_PIX_FMT_NONE;
575
            return AVERROR_UNKNOWN;
576
        }
577
    }
578
579
5672
    if (s->codec_id == AV_CODEC_ID_H263  ||
580
5211
        s->codec_id == AV_CODEC_ID_H263P ||
581
5211
        s->codec_id == AV_CODEC_ID_H263I)
582

461
        s->gob_index = H263_GOB_HEIGHT(s->height);
583
584
    // for skipping the frame
585
5672
    s->current_picture.f->pict_type = s->pict_type;
586
5672
    s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
587
588
    /* skip B-frames if we don't have reference frames */
589
5672
    if (!s->last_picture_ptr &&
590

348
        (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
591
        return get_consumed_bytes(s, buf_size);
592
5672
    if ((avctx->skip_frame >= AVDISCARD_NONREF &&
593
162
         s->pict_type == AV_PICTURE_TYPE_B)    ||
594
5672
        (avctx->skip_frame >= AVDISCARD_NONKEY &&
595
162
         s->pict_type != AV_PICTURE_TYPE_I)    ||
596
5625
        avctx->skip_frame >= AVDISCARD_ALL)
597
159
        return get_consumed_bytes(s, buf_size);
598
599
5513
    if (s->next_p_frame_damaged) {
600
        if (s->pict_type == AV_PICTURE_TYPE_B)
601
            return get_consumed_bytes(s, buf_size);
602
        else
603
            s->next_p_frame_damaged = 0;
604
    }
605
606

5513
    if ((!s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) {
607
3571
        s->me.qpel_put = s->qdsp.put_qpel_pixels_tab;
608
3571
        s->me.qpel_avg = s->qdsp.avg_qpel_pixels_tab;
609
    } else {
610
1942
        s->me.qpel_put = s->qdsp.put_no_rnd_qpel_pixels_tab;
611
1942
        s->me.qpel_avg = s->qdsp.avg_qpel_pixels_tab;
612
    }
613
614
5513
    if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
615
        return ret;
616
617

5513
    if (!s->divx_packed && !avctx->hwaccel)
618
5498
        ff_thread_finish_setup(avctx);
619
620
5513
    if (avctx->hwaccel) {
621
        ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer,
622
                                          s->gb.buffer_end - s->gb.buffer);
623
        if (ret < 0 )
624
            return ret;
625
    }
626
627
5513
    ff_mpeg_er_frame_start(s);
628
629
    /* the second part of the wmv2 header contains the MB skip bits which
630
     * are stored in current_picture->mb_type which is not available before
631
     * ff_mpv_frame_start() */
632
5513
    if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
633
674
        ret = ff_wmv2_decode_secondary_picture_header(s);
634
674
        if (ret < 0)
635
            return ret;
636
674
        if (ret == 1)
637
3
            goto frame_end;
638
    }
639
640
    /* decode each macroblock */
641
5510
    s->mb_x = 0;
642
5510
    s->mb_y = 0;
643
644
5510
    slice_ret = decode_slice(s);
645
11921
    while (s->mb_y < s->mb_height) {
646
6411
        if (s->msmpeg4_version) {
647
            if (s->slice_height == 0 || s->mb_x != 0 || slice_ret < 0 ||
648
                (s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0)
649
                break;
650
        } else {
651
6411
            int prev_x = s->mb_x, prev_y = s->mb_y;
652
6411
            if (ff_h263_resync(s) < 0)
653
                break;
654
6411
            if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
655
29
                s->er.error_occurred = 1;
656
        }
657
658

6411
        if (s->msmpeg4_version < 4 && s->h263_pred)
659
3867
            ff_mpeg4_clean_buffers(s);
660
661
6411
        if (decode_slice(s) < 0)
662
            slice_ret = AVERROR_INVALIDDATA;
663
    }
664
665

5510
    if (s->msmpeg4_version && s->msmpeg4_version < 4 &&
666
475
        s->pict_type == AV_PICTURE_TYPE_I)
667
44
        if (!CONFIG_MSMPEG4_DECODER ||
668
44
            ff_msmpeg4_decode_ext_header(s, buf_size) < 0)
669
            s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR;
670
671
    av_assert1(s->bitstream_buffer_size == 0);
672
5510
frame_end:
673
5513
    if (!s->studio_profile)
674
5513
        ff_er_frame_end(&s->er);
675
676
5513
    if (avctx->hwaccel) {
677
        ret = avctx->hwaccel->end_frame(avctx);
678
        if (ret < 0)
679
            return ret;
680
    }
681
682
5513
    ff_mpv_frame_end(s);
683
684
5513
    if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4)
685
3311
        ff_mpeg4_frame_end(avctx, buf, buf_size);
686
687

5513
    if (!s->divx_packed && avctx->hwaccel)
688
        ff_thread_finish_setup(avctx);
689
690
    av_assert1(s->current_picture.f->pict_type == s->current_picture_ptr->f->pict_type);
691
    av_assert1(s->current_picture.f->pict_type == s->pict_type);
692

5513
    if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
693
5126
        if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
694
            return ret;
695
5126
        ff_print_debug_info(s, s->current_picture_ptr, pict);
696
5126
        ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
697
387
    } else if (s->last_picture_ptr) {
698
363
        if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
699
            return ret;
700
363
        ff_print_debug_info(s, s->last_picture_ptr, pict);
701
363
        ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
702
    }
703
704

5513
    if (s->last_picture_ptr || s->low_delay) {
705
5489
        if (   pict->format == AV_PIX_FMT_YUV420P
706

5489
            && (s->codec_tag == AV_RL32("GEOV") || s->codec_tag == AV_RL32("GEOX"))) {
707
            int x, y, p;
708
            av_frame_make_writable(pict);
709
            for (p=0; p<3; p++) {
710
                int w = AV_CEIL_RSHIFT(pict-> width, !!p);
711
                int h = AV_CEIL_RSHIFT(pict->height, !!p);
712
                int linesize = pict->linesize[p];
713
                for (y=0; y<(h>>1); y++)
714
                    for (x=0; x<w; x++)
715
                        FFSWAP(int,
716
                               pict->data[p][x + y*linesize],
717
                               pict->data[p][x + (h-1-y)*linesize]);
718
            }
719
        }
720
5489
        *got_frame = 1;
721
    }
722
723

5513
    if (slice_ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
724
        return slice_ret;
725
    else
726
5513
        return get_consumed_bytes(s, buf_size);
727
}
728
729
const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = {
730
#if CONFIG_H263_VAAPI_HWACCEL || CONFIG_MPEG4_VAAPI_HWACCEL
731
    AV_PIX_FMT_VAAPI,
732
#endif
733
#if CONFIG_MPEG4_NVDEC_HWACCEL
734
    AV_PIX_FMT_CUDA,
735
#endif
736
#if CONFIG_MPEG4_VDPAU_HWACCEL
737
    AV_PIX_FMT_VDPAU,
738
#endif
739
#if CONFIG_H263_VIDEOTOOLBOX_HWACCEL || CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL
740
    AV_PIX_FMT_VIDEOTOOLBOX,
741
#endif
742
    AV_PIX_FMT_YUV420P,
743
    AV_PIX_FMT_NONE
744
};
745
746
const AVCodecHWConfigInternal *ff_h263_hw_config_list[] = {
747
#if CONFIG_H263_VAAPI_HWACCEL
748
    HWACCEL_VAAPI(h263),
749
#endif
750
#if CONFIG_MPEG4_NVDEC_HWACCEL
751
    HWACCEL_NVDEC(mpeg4),
752
#endif
753
#if CONFIG_MPEG4_VDPAU_HWACCEL
754
    HWACCEL_VDPAU(mpeg4),
755
#endif
756
#if CONFIG_H263_VIDEOTOOLBOX_HWACCEL
757
    HWACCEL_VIDEOTOOLBOX(h263),
758
#endif
759
    NULL
760
};
761
762
AVCodec ff_h263_decoder = {
763
    .name           = "h263",
764
    .long_name      = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
765
    .type           = AVMEDIA_TYPE_VIDEO,
766
    .id             = AV_CODEC_ID_H263,
767
    .priv_data_size = sizeof(MpegEncContext),
768
    .init           = ff_h263_decode_init,
769
    .close          = ff_h263_decode_end,
770
    .decode         = ff_h263_decode_frame,
771
    .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
772
                      AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY,
773
    .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
774
    .flush          = ff_mpeg_flush,
775
    .max_lowres     = 3,
776
    .pix_fmts       = ff_h263_hwaccel_pixfmt_list_420,
777
    .hw_configs     = ff_h263_hw_config_list,
778
};
779
780
AVCodec ff_h263p_decoder = {
781
    .name           = "h263p",
782
    .long_name      = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
783
    .type           = AVMEDIA_TYPE_VIDEO,
784
    .id             = AV_CODEC_ID_H263P,
785
    .priv_data_size = sizeof(MpegEncContext),
786
    .init           = ff_h263_decode_init,
787
    .close          = ff_h263_decode_end,
788
    .decode         = ff_h263_decode_frame,
789
    .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
790
                      AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY,
791
    .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
792
    .flush          = ff_mpeg_flush,
793
    .max_lowres     = 3,
794
    .pix_fmts       = ff_h263_hwaccel_pixfmt_list_420,
795
    .hw_configs     = ff_h263_hw_config_list,
796
};