GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/h264_parser.c Lines: 342 406 84.2 %
Date: 2019-11-22 03:34:36 Branches: 247 313 78.9 %

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
178781
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
178781
    ParseContext *pc = &p->pc;
74
75
178781
    int next_avc = p->is_avc ? 0 : buf_size;
76
//    mb_addr= pc->mb_addr - 1;
77
178781
    state = pc->state;
78
178781
    if (state > 13)
79
84
        state = 7;
80
81

178781
    if (p->is_avc && !p->nal_length_size)
82
        av_log(logctx, AV_LOG_ERROR, "AVC-parser: nal length size invalid\n");
83
84
2632307
    for (i = 0; i < buf_size; i++) {
85
2477345
        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
2477345
        if (state == 7) {
99
1173279
            i += p->h264dsp.startcode_find_candidate(buf + i, next_avc - i);
100
1173279
            if (i < next_avc)
101
1021002
                state = 2;
102
1304066
        } else if (state <= 2) {
103
1177353
            if (buf[i] == 1)
104
92388
                state ^= 5;            // 2->7, 1->4, 0->5
105
1084965
            else if (buf[i])
106
928854
                state = 7;
107
            else
108
156111
                state >>= 1;           // 2->1, 1->0, 0->0
109
126713
        } else if (state <= 5) {
110
67700
            int nalu_type = buf[i] & 0x1F;
111

67700
            if (nalu_type == H264_NAL_SEI || nalu_type == H264_NAL_SPS ||
112
52821
                nalu_type == H264_NAL_PPS || nalu_type == H264_NAL_AUD) {
113
19133
                if (pc->frame_start_found) {
114
7956
                    i++;
115
7956
                    goto found;
116
                }
117

48567
            } else if (nalu_type == H264_NAL_SLICE || nalu_type == H264_NAL_DPA ||
118
                       nalu_type == H264_NAL_IDR_SLICE) {
119
48190
                state += 8;
120
48190
                continue;
121
            }
122
11554
            state = 7;
123
        } else {
124
59013
            unsigned int mb, last_mb = p->parse_last_mb;
125
            GetBitContext gb;
126
59013
            p->parse_history[p->parse_history_count++] = buf[i];
127
128
59013
            init_get_bits(&gb, p->parse_history, 8*p->parse_history_count);
129
59013
            mb= get_ue_golomb_long(&gb);
130

59013
            if (get_bits_left(&gb) > 0 || p->parse_history_count > 5) {
131
48190
                p->parse_last_mb = mb;
132
48190
                if (pc->frame_start_found) {
133
24149
                    if (mb <= last_mb) {
134
15863
                        i -= p->parse_history_count - 1;
135
15863
                        p->parse_history_count = 0;
136
15863
                        goto found;
137
                    }
138
                } else
139
24041
                    pc->frame_start_found = 1;
140
32327
                p->parse_history_count = 0;
141
32327
                state = 7;
142
            }
143
        }
144
    }
145
154962
    pc->state = state;
146
154962
    if (p->is_avc)
147
        return next_avc;
148
154962
    return END_NOT_FOUND;
149
150
23819
found:
151
23819
    pc->state             = 7;
152
23819
    pc->frame_start_found = 0;
153
23819
    if (p->is_avc)
154
        return next_avc;
155
23819
    return i - (state & 5);
156
}
157
158
16028
static int scan_mmco_reset(AVCodecParserContext *s, GetBitContext *gb,
159
                           void *logctx)
160
{
161
    H264PredWeightTable pwt;
162
16028
    int slice_type_nos = s->pict_type & 3;
163
16028
    H264ParseContext *p = s->priv_data;
164
    int list_count, ref_count[2];
165
166
167
16028
    if (p->ps.pps->redundant_pic_cnt_present)
168
50
        get_ue_golomb(gb); // redundant_pic_count
169
170
16028
    if (slice_type_nos == AV_PICTURE_TYPE_B)
171
471
        get_bits1(gb); // direct_spatial_mv_pred
172
173
16028
    if (ff_h264_parse_ref_count(&list_count, ref_count, gb, p->ps.pps,
174
                                slice_type_nos, p->picture_structure, logctx) < 0)
175
5
        return AVERROR_INVALIDDATA;
176
177
16023
    if (slice_type_nos != AV_PICTURE_TYPE_I) {
178
        int list;
179
29177
        for (list = 0; list < list_count; list++) {
180
14850
            if (get_bits1(gb)) {
181
                int index;
182
11176
                for (index = 0; ; index++) {
183
11176
                    unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(gb);
184
185
11176
                    if (reordering_of_pic_nums_idc < 3)
186
8905
                        get_ue_golomb_long(gb);
187
2271
                    else if (reordering_of_pic_nums_idc > 3) {
188
9
                        av_log(logctx, AV_LOG_ERROR,
189
                               "illegal reordering_of_pic_nums_idc %d\n",
190
                               reordering_of_pic_nums_idc);
191
9
                        return AVERROR_INVALIDDATA;
192
                    } else
193
2262
                        break;
194
195
8905
                    if (index >= ref_count[list]) {
196
43
                        av_log(logctx, AV_LOG_ERROR,
197
                               "reference count %d overflow\n", index);
198
43
                        return AVERROR_INVALIDDATA;
199
                    }
200
                }
201
            }
202
        }
203
    }
204
205

15971
    if ((p->ps.pps->weighted_pred && slice_type_nos == AV_PICTURE_TYPE_P) ||
206

14997
        (p->ps.pps->weighted_bipred_idc == 1 && slice_type_nos == AV_PICTURE_TYPE_B))
207
992
        ff_h264_pred_weight_table(gb, p->ps.sps, ref_count, slice_type_nos,
208
                                  &pwt, p->picture_structure, logctx);
209
210
15971
    if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
211
        int i;
212
4359
        for (i = 0; i < MAX_MMCO_COUNT; i++) {
213
4359
            MMCOOpcode opcode = get_ue_golomb_31(gb);
214
4359
            if (opcode > (unsigned) MMCO_LONG) {
215
6
                av_log(logctx, AV_LOG_ERROR,
216
                       "illegal memory management control operation %d\n",
217
                       opcode);
218
6
                return AVERROR_INVALIDDATA;
219
            }
220
4353
            if (opcode == MMCO_END)
221
1481
               return 0;
222
2872
            else if (opcode == MMCO_RESET)
223
50
                return 1;
224
225

2822
            if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
226
2337
                get_ue_golomb_long(gb); // difference_of_pic_nums_minus1
227

2822
            if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
228
2383
                opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
229
818
                get_ue_golomb_31(gb);
230
        }
231
    }
232
233
14434
    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
26119
static inline int parse_nal_units(AVCodecParserContext *s,
245
                                  AVCodecContext *avctx,
246
                                  const uint8_t * const buf, int buf_size)
247
{
248
26119
    H264ParseContext *p = s->priv_data;
249
26119
    H2645RBSP rbsp = { NULL };
250
26119
    H2645NAL nal = { NULL };
251
    int buf_index, next_avc;
252
    unsigned int pps_id;
253
    unsigned int slice_type;
254
26119
    int state = -1, got_reset = 0;
255

26119
    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
26119
    s->pict_type         = AV_PICTURE_TYPE_I;
261
26119
    s->key_frame         = 0;
262
26119
    s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
263
264
26119
    ff_h264_sei_uninit(&p->sei);
265
26119
    p->sei.frame_packing.arrangement_cancel_flag = -1;
266
267
26119
    if (!buf_size)
268
241
        return 0;
269
270
25878
    av_fast_padded_malloc(&rbsp.rbsp_buffer, &rbsp.rbsp_buffer_alloc_size, buf_size);
271
25878
    if (!rbsp.rbsp_buffer)
272
        return AVERROR(ENOMEM);
273
274
25878
    buf_index     = 0;
275
25878
    next_avc      = p->is_avc ? 0 : buf_size;
276
12015
    for (;;) {
277
        const SPS *sps;
278
37893
        int src_length, consumed, nalsize = 0;
279
280
37893
        if (buf_index >= next_avc) {
281
2399
            nalsize = get_nalsize(p->nal_length_size, buf, buf_size, &buf_index, avctx);
282
2399
            if (nalsize < 0)
283
1
                break;
284
2398
            next_avc = buf_index + nalsize;
285
        } else {
286
35494
            buf_index = find_start_code(buf, buf_size, buf_index, next_avc);
287
35494
            if (buf_index >= buf_size)
288
                break;
289
35494
            if (buf_index >= next_avc)
290
                continue;
291
        }
292
37892
        src_length = next_avc - buf_index;
293
294
37892
        state = buf[buf_index];
295
37892
        switch (state & 0x1f) {
296
25877
        case H264_NAL_SLICE:
297
        case H264_NAL_IDR_SLICE:
298
            // Do not walk the whole buffer just to decode slice header
299

25877
            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
9639
                if (src_length > 60)
303
9493
                    src_length = 60;
304
            } else {
305
                /* To decode up to MMCOs */
306
16238
                if (src_length > 1000)
307
9045
                    src_length = 1000;
308
            }
309
25877
            break;
310
        }
311
37892
        consumed = ff_h2645_extract_rbsp(buf + buf_index, src_length, &rbsp, &nal, 1);
312
37892
        if (consumed < 0)
313
            break;
314
315
37892
        buf_index += consumed;
316
317
37892
        ret = init_get_bits8(&nal.gb, nal.data, nal.size);
318
37892
        if (ret < 0)
319
            goto fail;
320
37892
        get_bits1(&nal.gb);
321
37892
        nal.ref_idc = get_bits(&nal.gb, 2);
322
37892
        nal.type    = get_bits(&nal.gb, 5);
323
324

37892
        switch (nal.type) {
325
779
        case H264_NAL_SPS:
326
779
            ff_h264_decode_seq_parameter_set(&nal.gb, avctx, &p->ps, 0);
327
779
            break;
328
6922
        case H264_NAL_PPS:
329
6922
            ff_h264_decode_picture_parameter_set(&nal.gb, avctx, &p->ps,
330
                                                 nal.size_bits);
331
6922
            break;
332
1769
        case H264_NAL_SEI:
333
1769
            ff_h264_sei_decode(&p->sei, &nal.gb, &p->ps, avctx);
334
1769
            break;
335
578
        case H264_NAL_IDR_SLICE:
336
578
            s->key_frame = 1;
337
338
578
            p->poc.prev_frame_num        = 0;
339
578
            p->poc.prev_frame_num_offset = 0;
340
578
            p->poc.prev_poc_msb          =
341
578
            p->poc.prev_poc_lsb          = 0;
342
        /* fall through */
343
25877
        case H264_NAL_SLICE:
344
25877
            get_ue_golomb_long(&nal.gb);  // skip first_mb_in_slice
345
25877
            slice_type   = get_ue_golomb_31(&nal.gb);
346
25877
            s->pict_type = ff_h264_golomb_to_pict_type[slice_type % 5];
347
25877
            if (p->sei.recovery_point.recovery_frame_cnt >= 0) {
348
                /* key frame, since recovery_frame_cnt is set */
349
26
                s->key_frame = 1;
350
            }
351
25877
            pps_id = get_ue_golomb(&nal.gb);
352
25877
            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
25877
            if (!p->ps.pps_list[pps_id]) {
358
226
                av_log(avctx, AV_LOG_ERROR,
359
                       "non-existing PPS %u referenced\n", pps_id);
360
226
                goto fail;
361
            }
362
363
25651
            av_buffer_unref(&p->ps.pps_ref);
364
25651
            av_buffer_unref(&p->ps.sps_ref);
365
25651
            p->ps.pps = NULL;
366
25651
            p->ps.sps = NULL;
367
25651
            p->ps.pps_ref = av_buffer_ref(p->ps.pps_list[pps_id]);
368
25651
            if (!p->ps.pps_ref)
369
                goto fail;
370
25651
            p->ps.pps = (const PPS*)p->ps.pps_ref->data;
371
372
25651
            if (!p->ps.sps_list[p->ps.pps->sps_id]) {
373
                av_log(avctx, AV_LOG_ERROR,
374
                       "non-existing SPS %u referenced\n", p->ps.pps->sps_id);
375
                goto fail;
376
            }
377
378
25651
            p->ps.sps_ref = av_buffer_ref(p->ps.sps_list[p->ps.pps->sps_id]);
379
25651
            if (!p->ps.sps_ref)
380
                goto fail;
381
25651
            p->ps.sps = (const SPS*)p->ps.sps_ref->data;
382
383
25651
            sps = p->ps.sps;
384
385
            // heuristic to detect non marked keyframes
386

25651
            if (p->ps.sps->ref_frame_count <= 1 && p->ps.pps->ref_count[0] <= 1 && s->pict_type == AV_PICTURE_TYPE_I)
387
953
                s->key_frame = 1;
388
389
25651
            p->poc.frame_num = get_bits(&nal.gb, sps->log2_max_frame_num);
390
391
25651
            s->coded_width  = 16 * sps->mb_width;
392
25651
            s->coded_height = 16 * sps->mb_height;
393
25651
            s->width        = s->coded_width  - (sps->crop_right + sps->crop_left);
394
25651
            s->height       = s->coded_height - (sps->crop_top   + sps->crop_bottom);
395

25651
            if (s->width <= 0 || s->height <= 0) {
396
                s->width  = s->coded_width;
397
                s->height = s->coded_height;
398
            }
399
400

25651
            switch (sps->bit_depth_luma) {
401
150
            case 9:
402
150
                if (sps->chroma_format_idc == 3)      s->format = AV_PIX_FMT_YUV444P9;
403
150
                else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P9;
404
100
                else                                  s->format = AV_PIX_FMT_YUV420P9;
405
150
                break;
406
207
            case 10:
407
207
                if (sps->chroma_format_idc == 3)      s->format = AV_PIX_FMT_YUV444P10;
408
157
                else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P10;
409
70
                else                                  s->format = AV_PIX_FMT_YUV420P10;
410
207
                break;
411
25294
            case 8:
412
25294
                if (sps->chroma_format_idc == 3)      s->format = AV_PIX_FMT_YUV444P;
413
24935
                else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P;
414
24925
                else                                  s->format = AV_PIX_FMT_YUV420P;
415
25294
                break;
416
            default:
417
                s->format = AV_PIX_FMT_NONE;
418
            }
419
420
25651
            avctx->profile = ff_h264_get_profile(sps);
421
25651
            avctx->level   = sps->level_idc;
422
423
25651
            if (sps->frame_mbs_only_flag) {
424
18027
                p->picture_structure = PICT_FRAME;
425
            } else {
426
7624
                if (get_bits1(&nal.gb)) { // field_pic_flag
427
5489
                    p->picture_structure = PICT_TOP_FIELD + get_bits1(&nal.gb); // bottom_field_flag
428
                } else {
429
2135
                    p->picture_structure = PICT_FRAME;
430
                }
431
            }
432
433
25651
            if (nal.type == H264_NAL_IDR_SLICE)
434
578
                get_ue_golomb_long(&nal.gb); /* idr_pic_id */
435
25651
            if (sps->poc_type == 0) {
436
19005
                p->poc.poc_lsb = get_bits(&nal.gb, sps->log2_max_poc_lsb);
437
438
19005
                if (p->ps.pps->pic_order_present == 1 &&
439
2873
                    p->picture_structure == PICT_FRAME)
440
2305
                    p->poc.delta_poc_bottom = get_se_golomb(&nal.gb);
441
            }
442
443
25651
            if (sps->poc_type == 1 &&
444
3575
                !sps->delta_pic_order_always_zero_flag) {
445
3071
                p->poc.delta_poc[0] = get_se_golomb(&nal.gb);
446
447
3071
                if (p->ps.pps->pic_order_present == 1 &&
448
692
                    p->picture_structure == PICT_FRAME)
449
406
                    p->poc.delta_poc[1] = get_se_golomb(&nal.gb);
450
            }
451
452
            /* Decode POC of this picture.
453
             * The prev_ values needed for decoding POC of the next picture are not set here. */
454
25651
            field_poc[0] = field_poc[1] = INT_MAX;
455
25651
            ret = ff_h264_init_poc(field_poc, &s->output_picture_number, sps,
456
                             &p->poc, p->picture_structure, nal.ref_idc);
457
25651
            if (ret < 0)
458
                goto fail;
459
460
            /* Continue parsing to check if MMCO_RESET is present.
461
             * FIXME: MMCO_RESET could appear in non-first slice.
462
             *        Maybe, we should parse all undisposable non-IDR slice of this
463
             *        picture until encountering MMCO_RESET in a slice of it. */
464

25651
            if (nal.ref_idc && nal.type != H264_NAL_IDR_SLICE) {
465
16028
                got_reset = scan_mmco_reset(s, &nal.gb, avctx);
466
16028
                if (got_reset < 0)
467
63
                    goto fail;
468
            }
469
470
            /* Set up the prev_ values for decoding POC of the next picture. */
471
25588
            p->poc.prev_frame_num        = got_reset ? 0 : p->poc.frame_num;
472
25588
            p->poc.prev_frame_num_offset = got_reset ? 0 : p->poc.frame_num_offset;
473
25588
            if (nal.ref_idc != 0) {
474
16543
                if (!got_reset) {
475
16493
                    p->poc.prev_poc_msb = p->poc.poc_msb;
476
16493
                    p->poc.prev_poc_lsb = p->poc.poc_lsb;
477
                } else {
478
50
                    p->poc.prev_poc_msb = 0;
479
50
                    p->poc.prev_poc_lsb =
480
50
                        p->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
481
                }
482
            }
483
484

25588
            if (sps->pic_struct_present_flag && p->sei.picture_timing.present) {
485

2986
                switch (p->sei.picture_timing.pic_struct) {
486
358
                case H264_SEI_PIC_STRUCT_TOP_FIELD:
487
                case H264_SEI_PIC_STRUCT_BOTTOM_FIELD:
488
358
                    s->repeat_pict = 0;
489
358
                    break;
490
997
                case H264_SEI_PIC_STRUCT_FRAME:
491
                case H264_SEI_PIC_STRUCT_TOP_BOTTOM:
492
                case H264_SEI_PIC_STRUCT_BOTTOM_TOP:
493
997
                    s->repeat_pict = 1;
494
997
                    break;
495
138
                case H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
496
                case H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
497
138
                    s->repeat_pict = 2;
498
138
                    break;
499
                case H264_SEI_PIC_STRUCT_FRAME_DOUBLING:
500
                    s->repeat_pict = 3;
501
                    break;
502
                case H264_SEI_PIC_STRUCT_FRAME_TRIPLING:
503
                    s->repeat_pict = 5;
504
                    break;
505
                default:
506
                    s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
507
                    break;
508
                }
509
            } else {
510
24095
                s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
511
            }
512
513
25588
            if (p->picture_structure == PICT_FRAME) {
514
20099
                s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
515

20099
                if (sps->pic_struct_present_flag && p->sei.picture_timing.present) {
516
2270
                    switch (p->sei.picture_timing.pic_struct) {
517
627
                    case H264_SEI_PIC_STRUCT_TOP_BOTTOM:
518
                    case H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
519
627
                        s->field_order = AV_FIELD_TT;
520
627
                        break;
521
150
                    case H264_SEI_PIC_STRUCT_BOTTOM_TOP:
522
                    case H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
523
150
                        s->field_order = AV_FIELD_BB;
524
150
                        break;
525
358
                    default:
526
358
                        s->field_order = AV_FIELD_PROGRESSIVE;
527
358
                        break;
528
                    }
529
                } else {
530
18964
                    if (field_poc[0] < field_poc[1])
531
1042
                        s->field_order = AV_FIELD_TT;
532
17922
                    else if (field_poc[0] > field_poc[1])
533
3
                        s->field_order = AV_FIELD_BB;
534
                    else
535
17919
                        s->field_order = AV_FIELD_PROGRESSIVE;
536
                }
537
            } else {
538
5489
                if (p->picture_structure == PICT_TOP_FIELD)
539
2748
                    s->picture_structure = AV_PICTURE_STRUCTURE_TOP_FIELD;
540
                else
541
2741
                    s->picture_structure = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
542
5489
                if (p->poc.frame_num == p->last_frame_num &&
543
4276
                    p->last_picture_structure != AV_PICTURE_STRUCTURE_UNKNOWN &&
544
4276
                    p->last_picture_structure != AV_PICTURE_STRUCTURE_FRAME &&
545
4276
                    p->last_picture_structure != s->picture_structure) {
546
4272
                    if (p->last_picture_structure == AV_PICTURE_STRUCTURE_TOP_FIELD)
547
2740
                        s->field_order = AV_FIELD_TT;
548
                    else
549
1532
                        s->field_order = AV_FIELD_BB;
550
                } else {
551
1217
                    s->field_order = AV_FIELD_UNKNOWN;
552
                }
553
5489
                p->last_picture_structure = s->picture_structure;
554
5489
                p->last_frame_num = p->poc.frame_num;
555
            }
556
557
25588
            av_freep(&rbsp.rbsp_buffer);
558
25588
            return 0; /* no need to evaluate the rest */
559
        }
560
12015
    }
561
1
    if (q264) {
562
        av_freep(&rbsp.rbsp_buffer);
563
        return 0;
564
    }
565
    /* didn't find a picture! */
566
1
    av_log(avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
567
290
fail:
568
290
    av_freep(&rbsp.rbsp_buffer);
569
290
    return -1;
570
}
571
572
180532
static int h264_parse(AVCodecParserContext *s,
573
                      AVCodecContext *avctx,
574
                      const uint8_t **poutbuf, int *poutbuf_size,
575
                      const uint8_t *buf, int buf_size)
576
{
577
180532
    H264ParseContext *p = s->priv_data;
578
180532
    ParseContext *pc = &p->pc;
579
    int next;
580
581
180532
    if (!p->got_first) {
582
245
        p->got_first = 1;
583
245
        if (avctx->extradata_size) {
584
26
            ff_h264_decode_extradata(avctx->extradata, avctx->extradata_size,
585
                                     &p->ps, &p->is_avc, &p->nal_length_size,
586
                                     avctx->err_recognition, avctx);
587
        }
588
    }
589
590
180532
    if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
591
1858
        next = buf_size;
592
    } else {
593
178674
        next = h264_find_frame_end(p, buf, buf_size, avctx);
594
595
178674
        if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
596
154413
            *poutbuf      = NULL;
597
154413
            *poutbuf_size = 0;
598
154413
            return buf_size;
599
        }
600
601

24261
        if (next < 0 && next != END_NOT_FOUND) {
602
            av_assert1(pc->last_index + next >= 0);
603
107
            h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next, avctx); // update state
604
        }
605
    }
606
607
26119
    parse_nal_units(s, avctx, buf, buf_size);
608
609
26119
    if (avctx->framerate.num)
610
25550
        avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){avctx->ticks_per_frame, 1}));
611
26119
    if (p->sei.picture_timing.cpb_removal_delay >= 0) {
612
773
        s->dts_sync_point    = p->sei.buffering_period.present;
613
773
        s->dts_ref_dts_delta = p->sei.picture_timing.cpb_removal_delay;
614
773
        s->pts_dts_delta     = p->sei.picture_timing.dpb_output_delay;
615
    } else {
616
25346
        s->dts_sync_point    = INT_MIN;
617
25346
        s->dts_ref_dts_delta = INT_MIN;
618
25346
        s->pts_dts_delta     = INT_MIN;
619
    }
620
621
26119
    if (s->flags & PARSER_FLAG_ONCE) {
622
        s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
623
    }
624
625
26119
    if (s->dts_sync_point >= 0) {
626
773
        int64_t den = avctx->time_base.den * (int64_t)avctx->pkt_timebase.num;
627
773
        if (den > 0) {
628
773
            int64_t num = avctx->time_base.num * (int64_t)avctx->pkt_timebase.den;
629
773
            if (s->dts != AV_NOPTS_VALUE) {
630
                // got DTS from the stream, update reference timestamp
631
372
                p->reference_dts = s->dts - av_rescale(s->dts_ref_dts_delta, num, den);
632
401
            } else if (p->reference_dts != AV_NOPTS_VALUE) {
633
                // compute DTS based on reference timestamp
634
                s->dts = p->reference_dts + av_rescale(s->dts_ref_dts_delta, num, den);
635
            }
636
637

773
            if (p->reference_dts != AV_NOPTS_VALUE && s->pts == AV_NOPTS_VALUE)
638
                s->pts = s->dts + av_rescale(s->pts_dts_delta, num, den);
639
640
773
            if (s->dts_sync_point > 0)
641
31
                p->reference_dts = s->dts; // new reference
642
        }
643
    }
644
645
26119
    *poutbuf      = buf;
646
26119
    *poutbuf_size = buf_size;
647
26119
    return next;
648
}
649
650
static int h264_split(AVCodecContext *avctx,
651
                      const uint8_t *buf, int buf_size)
652
{
653
    uint32_t state = -1;
654
    int has_sps    = 0;
655
    int has_pps    = 0;
656
    const uint8_t *ptr = buf, *end = buf + buf_size;
657
    int nalu_type;
658
659
    while (ptr < end) {
660
        ptr = avpriv_find_start_code(ptr, end, &state);
661
        if ((state & 0xFFFFFF00) != 0x100)
662
            break;
663
        nalu_type = state & 0x1F;
664
        if (nalu_type == H264_NAL_SPS) {
665
            has_sps = 1;
666
        } else if (nalu_type == H264_NAL_PPS)
667
            has_pps = 1;
668
        /* else if (nalu_type == 0x01 ||
669
         *     nalu_type == 0x02 ||
670
         *     nalu_type == 0x05) {
671
         *  }
672
         */
673
        else if ((nalu_type != H264_NAL_SEI || has_pps) &&
674
                  nalu_type != H264_NAL_AUD && nalu_type != H264_NAL_SPS_EXT &&
675
                  nalu_type != 0x0f) {
676
            if (has_sps) {
677
                while (ptr - 4 > buf && ptr[-5] == 0)
678
                    ptr--;
679
                return ptr - 4 - buf;
680
            }
681
        }
682
    }
683
684
    return 0;
685
}
686
687
289
static void h264_close(AVCodecParserContext *s)
688
{
689
289
    H264ParseContext *p = s->priv_data;
690
289
    ParseContext *pc = &p->pc;
691
692
289
    av_freep(&pc->buffer);
693
694
289
    ff_h264_sei_uninit(&p->sei);
695
289
    ff_h264_ps_uninit(&p->ps);
696
289
}
697
698
289
static av_cold int init(AVCodecParserContext *s)
699
{
700
289
    H264ParseContext *p = s->priv_data;
701
702
289
    p->reference_dts = AV_NOPTS_VALUE;
703
289
    p->last_frame_num = INT_MAX;
704
289
    ff_h264dsp_init(&p->h264dsp, 8, 1);
705
289
    return 0;
706
}
707
708
AVCodecParser ff_h264_parser = {
709
    .codec_ids      = { AV_CODEC_ID_H264 },
710
    .priv_data_size = sizeof(H264ParseContext),
711
    .parser_init    = init,
712
    .parser_parse   = h264_parse,
713
    .parser_close   = h264_close,
714
    .split          = h264_split,
715
};