GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/h264_parser.c Lines: 332 403 82.4 %
Date: 2021-04-19 06:27:07 Branches: 241 313 77.0 %

Line Branch Exec Source
1
/*
2
 * H.26L/H.264/AVC/JVT/14496-10/... parser
3
 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21
22
/**
23
 * @file
24
 * H.264 / AVC / MPEG-4 part10 parser.
25
 * @author Michael Niedermayer <michaelni@gmx.at>
26
 */
27
28
#define UNCHECKED_BITSTREAM_READER 1
29
30
#include <assert.h>
31
#include <stdint.h>
32
33
#include "libavutil/avutil.h"
34
#include "libavutil/error.h"
35
#include "libavutil/log.h"
36
#include "libavutil/mem.h"
37
#include "libavutil/pixfmt.h"
38
39
#include "avcodec.h"
40
#include "get_bits.h"
41
#include "golomb.h"
42
#include "h264.h"
43
#include "h264_sei.h"
44
#include "h264_ps.h"
45
#include "h264data.h"
46
#include "internal.h"
47
#include "mpegutils.h"
48
#include "parser.h"
49
50
typedef struct H264ParseContext {
51
    ParseContext pc;
52
    H264ParamSets ps;
53
    H264DSPContext h264dsp;
54
    H264POCContext poc;
55
    H264SEIContext sei;
56
    int is_avc;
57
    int nal_length_size;
58
    int got_first;
59
    int picture_structure;
60
    uint8_t parse_history[6];
61
    int parse_history_count;
62
    int parse_last_mb;
63
    int64_t reference_dts;
64
    int last_frame_num, last_picture_structure;
65
} H264ParseContext;
66
67
68
179997
static int h264_find_frame_end(H264ParseContext *p, const uint8_t *buf,
69
                               int buf_size, void *logctx)
70
{
71
    int i, j;
72
    uint32_t state;
73
179997
    ParseContext *pc = &p->pc;
74
75
179997
    int next_avc = p->is_avc ? 0 : buf_size;
76
//    mb_addr= pc->mb_addr - 1;
77
179997
    state = pc->state;
78
179997
    if (state > 13)
79
85
        state = 7;
80
81

179997
    if (p->is_avc && !p->nal_length_size)
82
        av_log(logctx, AV_LOG_ERROR, "AVC-parser: nal length size invalid\n");
83
84
2651487
    for (i = 0; i < buf_size; i++) {
85
2495860
        if (i >= next_avc) {
86
            int nalsize = 0;
87
            i = next_avc;
88
            for (j = 0; j < p->nal_length_size; j++)
89
                nalsize = (nalsize << 8) | buf[i++];
90
            if (nalsize <= 0 || nalsize > buf_size - i) {
91
                av_log(logctx, AV_LOG_ERROR, "AVC-parser: nal size %d remaining %d\n", nalsize, buf_size - i);
92
                return buf_size;
93
            }
94
            next_avc = i + nalsize;
95
            state    = 5;
96
        }
97
98
2495860
        if (state == 7) {
99
1179946
            i += p->h264dsp.startcode_find_candidate(buf + i, next_avc - i);
100
1179946
            if (i < next_avc)
101
1027014
                state = 2;
102
1315914
        } else if (state <= 2) {
103
1186706
            if (buf[i] == 1)
104
93957
                state ^= 5;            // 2->7, 1->4, 0->5
105
1092749
            else if (buf[i])
106
933301
                state = 7;
107
            else
108
159448
                state >>= 1;           // 2->1, 1->0, 0->0
109
129208
        } else if (state <= 5) {
110
69203
            int nalu_type = buf[i] & 0x1F;
111

69203
            if (nalu_type == H264_NAL_SEI || nalu_type == H264_NAL_SPS ||
112
54114
                nalu_type == H264_NAL_PPS || nalu_type == H264_NAL_AUD) {
113
19552
                if (pc->frame_start_found) {
114
8070
                    i++;
115
8070
                    goto found;
116
                }
117

49651
            } else if (nalu_type == H264_NAL_SLICE || nalu_type == H264_NAL_DPA ||
118
                       nalu_type == H264_NAL_IDR_SLICE) {
119
49182
                state += 8;
120
49182
                continue;
121
            }
122
11951
            state = 7;
123
        } else {
124
60005
            unsigned int mb, last_mb = p->parse_last_mb;
125
            GetBitContext gb;
126
60005
            p->parse_history[p->parse_history_count++] = buf[i];
127
128
60005
            init_get_bits(&gb, p->parse_history, 8*p->parse_history_count);
129
60005
            mb= get_ue_golomb_long(&gb);
130

60005
            if (get_bits_left(&gb) > 0 || p->parse_history_count > 5) {
131
49182
                p->parse_last_mb = mb;
132
49182
                if (pc->frame_start_found) {
133
24586
                    if (mb <= last_mb) {
134
16300
                        i -= p->parse_history_count - 1;
135
16300
                        p->parse_history_count = 0;
136
16300
                        goto found;
137
                    }
138
                } else
139
24596
                    pc->frame_start_found = 1;
140
32882
                p->parse_history_count = 0;
141
32882
                state = 7;
142
            }
143
        }
144
    }
145
155627
    pc->state = state;
146
155627
    if (p->is_avc)
147
        return next_avc;
148
155627
    return END_NOT_FOUND;
149
150
24370
found:
151
24370
    pc->state             = 7;
152
24370
    pc->frame_start_found = 0;
153
24370
    if (p->is_avc)
154
        return next_avc;
155
24370
    return i - (state & 5);
156
}
157
158
16147
static int scan_mmco_reset(AVCodecParserContext *s, GetBitContext *gb,
159
                           void *logctx)
160
{
161
    H264PredWeightTable pwt;
162
16147
    int slice_type_nos = s->pict_type & 3;
163
16147
    H264ParseContext *p = s->priv_data;
164
    int list_count, ref_count[2];
165
166
167
16147
    if (p->ps.pps->redundant_pic_cnt_present)
168
        get_ue_golomb(gb); // redundant_pic_count
169
170
16147
    if (slice_type_nos == AV_PICTURE_TYPE_B)
171
559
        get_bits1(gb); // direct_spatial_mv_pred
172
173
16147
    if (ff_h264_parse_ref_count(&list_count, ref_count, gb, p->ps.pps,
174
                                slice_type_nos, p->picture_structure, logctx) < 0)
175
        return AVERROR_INVALIDDATA;
176
177
16147
    if (slice_type_nos != AV_PICTURE_TYPE_I) {
178
        int list;
179
29553
        for (list = 0; list < list_count; list++) {
180
15056
            if (get_bits1(gb)) {
181
                int index;
182
11266
                for (index = 0; ; index++) {
183
11266
                    unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(gb);
184
185
11266
                    if (reordering_of_pic_nums_idc < 3)
186
8963
                        get_ue_golomb_long(gb);
187
2303
                    else if (reordering_of_pic_nums_idc > 3) {
188
                        av_log(logctx, AV_LOG_ERROR,
189
                               "illegal reordering_of_pic_nums_idc %d\n",
190
                               reordering_of_pic_nums_idc);
191
                        return AVERROR_INVALIDDATA;
192
                    } else
193
2303
                        break;
194
195
8963
                    if (index >= ref_count[list]) {
196
                        av_log(logctx, AV_LOG_ERROR,
197
                               "reference count %d overflow\n", index);
198
                        return AVERROR_INVALIDDATA;
199
                    }
200
                }
201
            }
202
        }
203
    }
204
205

16147
    if ((p->ps.pps->weighted_pred && slice_type_nos == AV_PICTURE_TYPE_P) ||
206

14870
        (p->ps.pps->weighted_bipred_idc == 1 && slice_type_nos == AV_PICTURE_TYPE_B))
207
1295
        ff_h264_pred_weight_table(gb, p->ps.sps, ref_count, slice_type_nos,
208
                                  &pwt, p->picture_structure, logctx);
209
210
16147
    if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
211
        int i;
212
4581
        for (i = 0; i < MAX_MMCO_COUNT; i++) {
213
4581
            MMCOOpcode opcode = get_ue_golomb_31(gb);
214
4581
            if (opcode > (unsigned) MMCO_LONG) {
215
                av_log(logctx, AV_LOG_ERROR,
216
                       "illegal memory management control operation %d\n",
217
                       opcode);
218
                return AVERROR_INVALIDDATA;
219
            }
220
4581
            if (opcode == MMCO_END)
221
1554
               return 0;
222
3027
            else if (opcode == MMCO_RESET)
223
50
                return 1;
224
225

2977
            if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
226
2502
                get_ue_golomb_long(gb); // difference_of_pic_nums_minus1
227

2977
            if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
228
2548
                opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
229
808
                get_ue_golomb_31(gb);
230
        }
231
    }
232
233
14543
    return 0;
234
}
235
236
/**
237
 * Parse NAL units of found picture and decode some basic information.
238
 *
239
 * @param s parser context.
240
 * @param avctx codec context.
241
 * @param buf buffer with field/frame data.
242
 * @param buf_size size of the buffer.
243
 */
244
26944
static inline int parse_nal_units(AVCodecParserContext *s,
245
                                  AVCodecContext *avctx,
246
                                  const uint8_t * const buf, int buf_size)
247
{
248
26944
    H264ParseContext *p = s->priv_data;
249
26944
    H2645RBSP rbsp = { NULL };
250
26944
    H2645NAL nal = { NULL };
251
    int buf_index, next_avc;
252
    unsigned int pps_id;
253
    unsigned int slice_type;
254
26944
    int state = -1, got_reset = 0;
255

26944
    int q264 = buf_size >=4 && !memcmp("Q264", buf, 4);
256
    int field_poc[2];
257
    int ret;
258
259
    /* set some sane default values */
260
26944
    s->pict_type         = AV_PICTURE_TYPE_I;
261
26944
    s->key_frame         = 0;
262
26944
    s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
263
264
26944
    ff_h264_sei_uninit(&p->sei);
265
26944
    p->sei.frame_packing.arrangement_cancel_flag = -1;
266
267
26944
    if (!buf_size)
268
247
        return 0;
269
270
26697
    av_fast_padded_malloc(&rbsp.rbsp_buffer, &rbsp.rbsp_buffer_alloc_size, buf_size);
271
26697
    if (!rbsp.rbsp_buffer)
272
        return AVERROR(ENOMEM);
273
274
26697
    buf_index     = 0;
275
26697
    next_avc      = p->is_avc ? 0 : buf_size;
276
12599
    for (;;) {
277
        const SPS *sps;
278
39296
        int src_length, consumed, nalsize = 0;
279
280
39296
        if (buf_index >= next_avc) {
281
2945
            nalsize = get_nalsize(p->nal_length_size, buf, buf_size, &buf_index, avctx);
282
2945
            if (nalsize < 0)
283
1
                break;
284
2944
            next_avc = buf_index + nalsize;
285
        } else {
286
36351
            buf_index = find_start_code(buf, buf_size, buf_index, next_avc);
287
36351
            if (buf_index >= buf_size)
288
                break;
289
36351
            if (buf_index >= next_avc)
290
                continue;
291
        }
292
39295
        src_length = next_avc - buf_index;
293
294
39295
        state = buf[buf_index];
295
39295
        switch (state & 0x1f) {
296
26696
        case H264_NAL_SLICE:
297
        case H264_NAL_IDR_SLICE:
298
            // Do not walk the whole buffer just to decode slice header
299

26696
            if ((state & 0x1f) == H264_NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
300
                /* IDR or disposable slice
301
                 * No need to decode many bytes because MMCOs shall not be present. */
302
10007
                if (src_length > 60)
303
9837
                    src_length = 60;
304
            } else {
305
                /* To decode up to MMCOs */
306
16689
                if (src_length > 1000)
307
9302
                    src_length = 1000;
308
            }
309
26696
            break;
310
        }
311
39295
        consumed = ff_h2645_extract_rbsp(buf + buf_index, src_length, &rbsp, &nal, 1);
312
39295
        if (consumed < 0)
313
            break;
314
315
39295
        buf_index += consumed;
316
317
39295
        ret = init_get_bits8(&nal.gb, nal.data, nal.size);
318
39295
        if (ret < 0)
319
            goto fail;
320
39295
        get_bits1(&nal.gb);
321
39295
        nal.ref_idc = get_bits(&nal.gb, 2);
322
39295
        nal.type    = get_bits(&nal.gb, 5);
323
324

39295
        switch (nal.type) {
325
798
        case H264_NAL_SPS:
326
798
            ff_h264_decode_seq_parameter_set(&nal.gb, avctx, &p->ps, 0);
327
798
            break;
328
6941
        case H264_NAL_PPS:
329
6941
            ff_h264_decode_picture_parameter_set(&nal.gb, avctx, &p->ps,
330
                                                 nal.size_bits);
331
6941
            break;
332
2145
        case H264_NAL_SEI:
333
2145
            ff_h264_sei_decode(&p->sei, &nal.gb, &p->ps, avctx);
334
2145
            break;
335
587
        case H264_NAL_IDR_SLICE:
336
587
            s->key_frame = 1;
337
338
587
            p->poc.prev_frame_num        = 0;
339
587
            p->poc.prev_frame_num_offset = 0;
340
587
            p->poc.prev_poc_msb          =
341
587
            p->poc.prev_poc_lsb          = 0;
342
        /* fall through */
343
26696
        case H264_NAL_SLICE:
344
26696
            get_ue_golomb_long(&nal.gb);  // skip first_mb_in_slice
345
26696
            slice_type   = get_ue_golomb_31(&nal.gb);
346
26696
            s->pict_type = ff_h264_golomb_to_pict_type[slice_type % 5];
347
26696
            if (p->sei.recovery_point.recovery_frame_cnt >= 0) {
348
                /* key frame, since recovery_frame_cnt is set */
349
40
                s->key_frame = 1;
350
            }
351
26696
            pps_id = get_ue_golomb(&nal.gb);
352
26696
            if (pps_id >= MAX_PPS_COUNT) {
353
                av_log(avctx, AV_LOG_ERROR,
354
                       "pps_id %u out of range\n", pps_id);
355
                goto fail;
356
            }
357
26696
            if (!p->ps.pps_list[pps_id]) {
358
568
                av_log(avctx, AV_LOG_ERROR,
359
                       "non-existing PPS %u referenced\n", pps_id);
360
568
                goto fail;
361
            }
362
363
26128
            av_buffer_unref(&p->ps.pps_ref);
364
26128
            p->ps.pps = NULL;
365
26128
            p->ps.sps = NULL;
366
26128
            p->ps.pps_ref = av_buffer_ref(p->ps.pps_list[pps_id]);
367
26128
            if (!p->ps.pps_ref)
368
                goto fail;
369
26128
            p->ps.pps = (const PPS*)p->ps.pps_ref->data;
370
26128
            p->ps.sps = p->ps.pps->sps;
371
26128
            sps       = p->ps.sps;
372
373
            // heuristic to detect non marked keyframes
374

26128
            if (p->ps.sps->ref_frame_count <= 1 && p->ps.pps->ref_count[0] <= 1 && s->pict_type == AV_PICTURE_TYPE_I)
375
953
                s->key_frame = 1;
376
377
26128
            p->poc.frame_num = get_bits(&nal.gb, sps->log2_max_frame_num);
378
379
26128
            s->coded_width  = 16 * sps->mb_width;
380
26128
            s->coded_height = 16 * sps->mb_height;
381
26128
            s->width        = s->coded_width  - (sps->crop_right + sps->crop_left);
382
26128
            s->height       = s->coded_height - (sps->crop_top   + sps->crop_bottom);
383

26128
            if (s->width <= 0 || s->height <= 0) {
384
                s->width  = s->coded_width;
385
                s->height = s->coded_height;
386
            }
387
388

26128
            switch (sps->bit_depth_luma) {
389
150
            case 9:
390
150
                if (sps->chroma_format_idc == 3)      s->format = AV_PIX_FMT_YUV444P9;
391
150
                else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P9;
392
100
                else                                  s->format = AV_PIX_FMT_YUV420P9;
393
150
                break;
394
207
            case 10:
395
207
                if (sps->chroma_format_idc == 3)      s->format = AV_PIX_FMT_YUV444P10;
396
157
                else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P10;
397
70
                else                                  s->format = AV_PIX_FMT_YUV420P10;
398
207
                break;
399
25771
            case 8:
400
25771
                if (sps->chroma_format_idc == 3)      s->format = AV_PIX_FMT_YUV444P;
401
25276
                else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P;
402
25266
                else                                  s->format = AV_PIX_FMT_YUV420P;
403
25771
                break;
404
            default:
405
                s->format = AV_PIX_FMT_NONE;
406
            }
407
408
26128
            avctx->profile = ff_h264_get_profile(sps);
409
26128
            avctx->level   = sps->level_idc;
410
411
26128
            if (sps->frame_mbs_only_flag) {
412
18283
                p->picture_structure = PICT_FRAME;
413
            } else {
414
7845
                if (get_bits1(&nal.gb)) { // field_pic_flag
415
5710
                    p->picture_structure = PICT_TOP_FIELD + get_bits1(&nal.gb); // bottom_field_flag
416
                } else {
417
2135
                    p->picture_structure = PICT_FRAME;
418
                }
419
            }
420
421
26128
            if (nal.type == H264_NAL_IDR_SLICE)
422
585
                get_ue_golomb_long(&nal.gb); /* idr_pic_id */
423
26128
            if (sps->poc_type == 0) {
424
19812
                p->poc.poc_lsb = get_bits(&nal.gb, sps->log2_max_poc_lsb);
425
426
19812
                if (p->ps.pps->pic_order_present == 1 &&
427
2873
                    p->picture_structure == PICT_FRAME)
428
2305
                    p->poc.delta_poc_bottom = get_se_golomb(&nal.gb);
429
            }
430
431
26128
            if (sps->poc_type == 1 &&
432
3245
                !sps->delta_pic_order_always_zero_flag) {
433
3071
                p->poc.delta_poc[0] = get_se_golomb(&nal.gb);
434
435
3071
                if (p->ps.pps->pic_order_present == 1 &&
436
692
                    p->picture_structure == PICT_FRAME)
437
406
                    p->poc.delta_poc[1] = get_se_golomb(&nal.gb);
438
            }
439
440
            /* Decode POC of this picture.
441
             * The prev_ values needed for decoding POC of the next picture are not set here. */
442
26128
            field_poc[0] = field_poc[1] = INT_MAX;
443
26128
            ret = ff_h264_init_poc(field_poc, &s->output_picture_number, sps,
444
                             &p->poc, p->picture_structure, nal.ref_idc);
445
26128
            if (ret < 0)
446
                goto fail;
447
448
            /* Continue parsing to check if MMCO_RESET is present.
449
             * FIXME: MMCO_RESET could appear in non-first slice.
450
             *        Maybe, we should parse all undisposable non-IDR slice of this
451
             *        picture until encountering MMCO_RESET in a slice of it. */
452

26128
            if (nal.ref_idc && nal.type != H264_NAL_IDR_SLICE) {
453
16147
                got_reset = scan_mmco_reset(s, &nal.gb, avctx);
454
16147
                if (got_reset < 0)
455
                    goto fail;
456
            }
457
458
            /* Set up the prev_ values for decoding POC of the next picture. */
459
26128
            p->poc.prev_frame_num        = got_reset ? 0 : p->poc.frame_num;
460
26128
            p->poc.prev_frame_num_offset = got_reset ? 0 : p->poc.frame_num_offset;
461
26128
            if (nal.ref_idc != 0) {
462
16732
                if (!got_reset) {
463
16682
                    p->poc.prev_poc_msb = p->poc.poc_msb;
464
16682
                    p->poc.prev_poc_lsb = p->poc.poc_lsb;
465
                } else {
466
50
                    p->poc.prev_poc_msb = 0;
467
50
                    p->poc.prev_poc_lsb =
468
50
                        p->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
469
                }
470
            }
471
472
26128
            if (p->sei.picture_timing.present) {
473
1728
                ret = ff_h264_sei_process_picture_timing(&p->sei.picture_timing,
474
                                                         sps, avctx);
475
1728
                if (ret < 0) {
476
                    av_log(avctx, AV_LOG_ERROR, "Error processing the picture timing SEI\n");
477
                    p->sei.picture_timing.present = 0;
478
                }
479
            }
480
481

26128
            if (sps->pic_struct_present_flag && p->sei.picture_timing.present) {
482

3432
                switch (p->sei.picture_timing.pic_struct) {
483
579
                case H264_SEI_PIC_STRUCT_TOP_FIELD:
484
                case H264_SEI_PIC_STRUCT_BOTTOM_FIELD:
485
579
                    s->repeat_pict = 0;
486
579
                    break;
487
999
                case H264_SEI_PIC_STRUCT_FRAME:
488
                case H264_SEI_PIC_STRUCT_TOP_BOTTOM:
489
                case H264_SEI_PIC_STRUCT_BOTTOM_TOP:
490
999
                    s->repeat_pict = 1;
491
999
                    break;
492
138
                case H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
493
                case H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
494
138
                    s->repeat_pict = 2;
495
138
                    break;
496
                case H264_SEI_PIC_STRUCT_FRAME_DOUBLING:
497
                    s->repeat_pict = 3;
498
                    break;
499
                case H264_SEI_PIC_STRUCT_FRAME_TRIPLING:
500
                    s->repeat_pict = 5;
501
                    break;
502
                default:
503
                    s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
504
                    break;
505
                }
506
            } else {
507
24412
                s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
508
            }
509
510
26128
            if (p->picture_structure == PICT_FRAME) {
511
20418
                s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
512

20418
                if (sps->pic_struct_present_flag && p->sei.picture_timing.present) {
513
2274
                    switch (p->sei.picture_timing.pic_struct) {
514
628
                    case H264_SEI_PIC_STRUCT_TOP_BOTTOM:
515
                    case H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
516
628
                        s->field_order = AV_FIELD_TT;
517
628
                        break;
518
150
                    case H264_SEI_PIC_STRUCT_BOTTOM_TOP:
519
                    case H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
520
150
                        s->field_order = AV_FIELD_BB;
521
150
                        break;
522
359
                    default:
523
359
                        s->field_order = AV_FIELD_PROGRESSIVE;
524
359
                        break;
525
                    }
526
                } else {
527
19281
                    if (field_poc[0] < field_poc[1])
528
1041
                        s->field_order = AV_FIELD_TT;
529
18240
                    else if (field_poc[0] > field_poc[1])
530
3
                        s->field_order = AV_FIELD_BB;
531
                    else
532
18237
                        s->field_order = AV_FIELD_PROGRESSIVE;
533
                }
534
            } else {
535
5710
                if (p->picture_structure == PICT_TOP_FIELD)
536
2860
                    s->picture_structure = AV_PICTURE_STRUCTURE_TOP_FIELD;
537
                else
538
2850
                    s->picture_structure = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
539
5710
                if (p->poc.frame_num == p->last_frame_num &&
540
4437
                    p->last_picture_structure != AV_PICTURE_STRUCTURE_UNKNOWN &&
541
4437
                    p->last_picture_structure != AV_PICTURE_STRUCTURE_FRAME &&
542
4437
                    p->last_picture_structure != s->picture_structure) {
543
4433
                    if (p->last_picture_structure == AV_PICTURE_STRUCTURE_TOP_FIELD)
544
2849
                        s->field_order = AV_FIELD_TT;
545
                    else
546
1584
                        s->field_order = AV_FIELD_BB;
547
                } else {
548
1277
                    s->field_order = AV_FIELD_UNKNOWN;
549
                }
550
5710
                p->last_picture_structure = s->picture_structure;
551
5710
                p->last_frame_num = p->poc.frame_num;
552
            }
553
554
26128
            av_freep(&rbsp.rbsp_buffer);
555
26128
            return 0; /* no need to evaluate the rest */
556
        }
557
12599
    }
558
1
    if (q264) {
559
        av_freep(&rbsp.rbsp_buffer);
560
        return 0;
561
    }
562
    /* didn't find a picture! */
563
1
    av_log(avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
564
569
fail:
565
569
    av_freep(&rbsp.rbsp_buffer);
566
569
    return -1;
567
}
568
569
182015
static int h264_parse(AVCodecParserContext *s,
570
                      AVCodecContext *avctx,
571
                      const uint8_t **poutbuf, int *poutbuf_size,
572
                      const uint8_t *buf, int buf_size)
573
{
574
182015
    H264ParseContext *p = s->priv_data;
575
182015
    ParseContext *pc = &p->pc;
576
    int next;
577
578
182015
    if (!p->got_first) {
579
258
        p->got_first = 1;
580
258
        if (avctx->extradata_size) {
581
36
            ff_h264_decode_extradata(avctx->extradata, avctx->extradata_size,
582
                                     &p->ps, &p->is_avc, &p->nal_length_size,
583
                                     avctx->err_recognition, avctx);
584
        }
585
    }
586
587
182015
    if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
588
2126
        next = buf_size;
589
    } else {
590
179889
        next = h264_find_frame_end(p, buf, buf_size, avctx);
591
592
179889
        if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
593
155071
            *poutbuf      = NULL;
594
155071
            *poutbuf_size = 0;
595
155071
            return buf_size;
596
        }
597
598

24818
        if (next < 0 && next != END_NOT_FOUND) {
599
            av_assert1(pc->last_index + next >= 0);
600
108
            h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next, avctx); // update state
601
        }
602
    }
603
604
26944
    parse_nal_units(s, avctx, buf, buf_size);
605
606
26944
    if (avctx->framerate.num)
607
26353
        avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){avctx->ticks_per_frame, 1}));
608
26944
    if (p->sei.picture_timing.cpb_removal_delay >= 0) {
609
775
        s->dts_sync_point    = p->sei.buffering_period.present;
610
775
        s->dts_ref_dts_delta = p->sei.picture_timing.cpb_removal_delay;
611
775
        s->pts_dts_delta     = p->sei.picture_timing.dpb_output_delay;
612
    } else {
613
26169
        s->dts_sync_point    = INT_MIN;
614
26169
        s->dts_ref_dts_delta = INT_MIN;
615
26169
        s->pts_dts_delta     = INT_MIN;
616
    }
617
618
26944
    if (s->flags & PARSER_FLAG_ONCE) {
619
        s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
620
    }
621
622
26944
    if (s->dts_sync_point >= 0) {
623
775
        int64_t den = avctx->time_base.den * (int64_t)avctx->pkt_timebase.num;
624
775
        if (den > 0) {
625
775
            int64_t num = avctx->time_base.num * (int64_t)avctx->pkt_timebase.den;
626
775
            if (s->dts != AV_NOPTS_VALUE) {
627
                // got DTS from the stream, update reference timestamp
628
373
                p->reference_dts = s->dts - av_rescale(s->dts_ref_dts_delta, num, den);
629
402
            } else if (p->reference_dts != AV_NOPTS_VALUE) {
630
                // compute DTS based on reference timestamp
631
                s->dts = p->reference_dts + av_rescale(s->dts_ref_dts_delta, num, den);
632
            }
633
634

775
            if (p->reference_dts != AV_NOPTS_VALUE && s->pts == AV_NOPTS_VALUE)
635
                s->pts = s->dts + av_rescale(s->pts_dts_delta, num, den);
636
637
775
            if (s->dts_sync_point > 0)
638
31
                p->reference_dts = s->dts; // new reference
639
        }
640
    }
641
642
26944
    *poutbuf      = buf;
643
26944
    *poutbuf_size = buf_size;
644
26944
    return next;
645
}
646
647
static int h264_split(AVCodecContext *avctx,
648
                      const uint8_t *buf, int buf_size)
649
{
650
    uint32_t state = -1;
651
    int has_sps    = 0;
652
    int has_pps    = 0;
653
    const uint8_t *ptr = buf, *end = buf + buf_size;
654
    int nalu_type;
655
656
    while (ptr < end) {
657
        ptr = avpriv_find_start_code(ptr, end, &state);
658
        if ((state & 0xFFFFFF00) != 0x100)
659
            break;
660
        nalu_type = state & 0x1F;
661
        if (nalu_type == H264_NAL_SPS) {
662
            has_sps = 1;
663
        } else if (nalu_type == H264_NAL_PPS)
664
            has_pps = 1;
665
        /* else if (nalu_type == 0x01 ||
666
         *     nalu_type == 0x02 ||
667
         *     nalu_type == 0x05) {
668
         *  }
669
         */
670
        else if ((nalu_type != H264_NAL_SEI || has_pps) &&
671
                  nalu_type != H264_NAL_AUD && nalu_type != H264_NAL_SPS_EXT &&
672
                  nalu_type != 0x0f) {
673
            if (has_sps) {
674
                while (ptr - 4 > buf && ptr[-5] == 0)
675
                    ptr--;
676
                return ptr - 4 - buf;
677
            }
678
        }
679
    }
680
681
    return 0;
682
}
683
684
303
static void h264_close(AVCodecParserContext *s)
685
{
686
303
    H264ParseContext *p = s->priv_data;
687
303
    ParseContext *pc = &p->pc;
688
689
303
    av_freep(&pc->buffer);
690
691
303
    ff_h264_sei_uninit(&p->sei);
692
303
    ff_h264_ps_uninit(&p->ps);
693
303
}
694
695
303
static av_cold int init(AVCodecParserContext *s)
696
{
697
303
    H264ParseContext *p = s->priv_data;
698
699
303
    p->reference_dts = AV_NOPTS_VALUE;
700
303
    p->last_frame_num = INT_MAX;
701
303
    ff_h264dsp_init(&p->h264dsp, 8, 1);
702
303
    return 0;
703
}
704
705
AVCodecParser ff_h264_parser = {
706
    .codec_ids      = { AV_CODEC_ID_H264 },
707
    .priv_data_size = sizeof(H264ParseContext),
708
    .parser_init    = init,
709
    .parser_parse   = h264_parse,
710
    .parser_close   = h264_close,
711
    .split          = h264_split,
712
};