FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/h264_parser.c
Date: 2025-11-04 10:33:36
Exec Total Coverage
Lines: 337 387 87.1%
Functions: 7 7 100.0%
Branches: 243 291 83.5%
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 <stdint.h>
31
32 #include "libavutil/attributes.h"
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 "h264dsp.h"
44 #include "h264_parse.h"
45 #include "h264_sei.h"
46 #include "h264_ps.h"
47 #include "h2645_parse.h"
48 #include "h264data.h"
49 #include "mpegutils.h"
50 #include "parser.h"
51 #include "libavutil/refstruct.h"
52 #include "parser_internal.h"
53 #include "startcode.h"
54
55 typedef struct H264ParseContext {
56 ParseContext pc;
57 H264ParamSets ps;
58 H264DSPContext h264dsp;
59 H264POCContext poc;
60 H264SEIContext sei;
61 int is_avc;
62 int nal_length_size;
63 int got_first;
64 int picture_structure;
65 uint8_t parse_history[6];
66 int parse_history_count;
67 int parse_last_mb;
68 int64_t reference_dts;
69 int last_frame_num, last_picture_structure;
70 } H264ParseContext;
71
72 39547 static int find_start_code(const uint8_t *buf, int buf_size,
73 int buf_index, int next_avc)
74 {
75 39547 uint32_t state = -1;
76
77 39547 buf_index = avpriv_find_start_code(buf + buf_index, buf + next_avc + 1, &state) - buf - 1;
78
79 39547 return FFMIN(buf_index, buf_size);
80 }
81
82 186424 static int h264_find_frame_end(H264ParseContext *p, const uint8_t *buf,
83 int buf_size, void *logctx)
84 {
85 int i, j;
86 uint32_t state;
87 186424 ParseContext *pc = &p->pc;
88
89
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 186424 int next_avc = p->is_avc ? 0 : buf_size;
90 // mb_addr= pc->mb_addr - 1;
91 186424 state = pc->state;
92
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 186424 if (state > 13)
93 96 state = 7;
94
95
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 186424 if (p->is_avc && !p->nal_length_size)
96 ✗ av_log(logctx, AV_LOG_ERROR, "AVC-parser: nal length size invalid\n");
97
98
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 2733383 for (i = 0; i < buf_size; i++) {
99
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 2573588 if (i >= next_avc) {
100 ✗ int64_t nalsize = 0;
101 ✗ i = next_avc;
102 ✗ for (j = 0; j < p->nal_length_size; j++)
103 ✗ nalsize = (nalsize << 8) | buf[i++];
104 ✗ if (!nalsize || nalsize > buf_size - i) {
105 ✗ av_log(logctx, AV_LOG_ERROR, "AVC-parser: nal size %"PRId64" "
106 "remaining %d\n", nalsize, buf_size - i);
107 ✗ return buf_size;
108 }
109 ✗ next_avc = i + nalsize;
110 ✗ state = 5;
111 }
112
113
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 2573588 if (state == 7) {
114 1208147 i += p->h264dsp.startcode_find_candidate(buf + i, next_avc - i);
115
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 1208147 if (i < next_avc)
116 1051144 state = 2;
117
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 1365441 } else if (state <= 2) {
118
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 1225015 if (buf[i] == 1)
119 100173 state ^= 5; // 2->7, 1->4, 0->5
120
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 1124842 else if (buf[i])
121 951225 state = 7;
122 else
123 173617 state >>= 1; // 2->1, 1->0, 0->0
124
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 140426 } else if (state <= 5) {
125 75218 int nalu_type = buf[i] & 0x1F;
126
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 75218 if (nalu_type == H264_NAL_SEI || nalu_type == H264_NAL_SPS ||
127
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 58649 nalu_type == H264_NAL_PPS || nalu_type == H264_NAL_AUD) {
128
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 21189 if (pc->frame_start_found) {
129 8780 i++;
130 8780 goto found;
131 }
132
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 54029 } else if (nalu_type == H264_NAL_SLICE || nalu_type == H264_NAL_DPA ||
133 nalu_type == H264_NAL_IDR_SLICE) {
134 53495 state += 8;
135 53495 continue;
136 }
137 12943 state = 7;
138 } else {
139 65208 unsigned int mb, last_mb = p->parse_last_mb;
140 GetBitContext gb;
141 65208 p->parse_history[p->parse_history_count++] = buf[i];
142
143 65208 init_get_bits(&gb, p->parse_history, 8*p->parse_history_count);
144 65208 mb= get_ue_golomb_long(&gb);
145
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 65208 if (get_bits_left(&gb) > 0 || p->parse_history_count > 5) {
146 53495 p->parse_last_mb = mb;
147
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 53495 if (pc->frame_start_found) {
148
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 26630 if (mb <= last_mb) {
149 17849 i -= p->parse_history_count - 1;
150 17849 p->parse_history_count = 0;
151 17849 goto found;
152 }
153 } else
154 26865 pc->frame_start_found = 1;
155 35646 p->parse_history_count = 0;
156 35646 state = 7;
157 }
158 }
159 }
160 159795 pc->state = state;
161
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 159795 if (p->is_avc)
162 ✗ return next_avc;
163 159795 return END_NOT_FOUND;
164
165 26629 found:
166 26629 pc->state = 7;
167 26629 pc->frame_start_found = 0;
168
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 26629 if (p->is_avc)
169 ✗ return next_avc;
170 26629 return i - (state & 5);
171 }
172
173 20682 static int scan_mmco_reset(AVCodecParserContext *s, GetBitContext *gb,
174 void *logctx)
175 {
176 H264PredWeightTable pwt;
177 20682 int slice_type_nos = s->pict_type & 3;
178 20682 H264ParseContext *p = s->priv_data;
179 int list_count, ref_count[2];
180
181
182
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 20682 if (p->ps.pps->redundant_pic_cnt_present)
183 ✗ get_ue_golomb(gb); // redundant_pic_count
184
185
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 20682 if (slice_type_nos == AV_PICTURE_TYPE_B)
186 1135 get_bits1(gb); // direct_spatial_mv_pred
187
188
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 20682 if (ff_h264_parse_ref_count(&list_count, ref_count, gb, p->ps.pps,
189 slice_type_nos, p->picture_structure, logctx) < 0)
190 ✗ return AVERROR_INVALIDDATA;
191
192
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 20682 if (slice_type_nos != AV_PICTURE_TYPE_I) {
193 int list;
194
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 38845 for (list = 0; list < list_count; list++) {
195
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 19990 if (get_bits1(gb)) {
196 int index;
197 15112 for (index = 0; ; index++) {
198 15112 unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(gb);
199
200
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 15112 if (reordering_of_pic_nums_idc < 3)
201 11962 get_ue_golomb_long(gb);
202
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 3150 else if (reordering_of_pic_nums_idc > 3) {
203 ✗ av_log(logctx, AV_LOG_ERROR,
204 "illegal reordering_of_pic_nums_idc %d\n",
205 reordering_of_pic_nums_idc);
206 ✗ return AVERROR_INVALIDDATA;
207 } else
208 3150 break;
209
210
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 11962 if (index >= ref_count[list]) {
211 ✗ av_log(logctx, AV_LOG_ERROR,
212 "reference count %d overflow\n", index);
213 ✗ return AVERROR_INVALIDDATA;
214 }
215 }
216 }
217 }
218 }
219
220
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 20682 if ((p->ps.pps->weighted_pred && slice_type_nos == AV_PICTURE_TYPE_P) ||
221
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 17235 (p->ps.pps->weighted_bipred_idc == 1 && slice_type_nos == AV_PICTURE_TYPE_B))
222 3471 ff_h264_pred_weight_table(gb, p->ps.sps, ref_count, slice_type_nos,
223 &pwt, p->picture_structure, logctx);
224
225
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 20682 if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
226 int i;
227
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 6224 for (i = 0; i < H264_MAX_MMCO_COUNT; i++) {
228 6224 MMCOOpcode opcode = get_ue_golomb_31(gb);
229
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 6224 if (opcode > (unsigned) MMCO_LONG) {
230 ✗ av_log(logctx, AV_LOG_ERROR,
231 "illegal memory management control operation %d\n",
232 opcode);
233 ✗ return AVERROR_INVALIDDATA;
234 }
235
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 6224 if (opcode == MMCO_END)
236 2099 return 0;
237
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 4125 else if (opcode == MMCO_RESET)
238 50 return 1;
239
240
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 4075 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
241 3600 get_ue_golomb_long(gb); // difference_of_pic_nums_minus1
242
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 4075 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
243
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 3646 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
244 808 get_ue_golomb_31(gb);
245 }
246 }
247
248 18533 return 0;
249 }
250
251 /**
252 * Parse NAL units of found picture and decode some basic information.
253 *
254 * @param s parser context.
255 * @param avctx codec context.
256 * @param buf buffer with field/frame data.
257 * @param buf_size size of the buffer.
258 */
259 34105 static inline int parse_nal_units(AVCodecParserContext *s,
260 AVCodecContext *avctx,
261 const uint8_t * const buf, int buf_size)
262 {
263 34105 H264ParseContext *p = s->priv_data;
264 34105 H2645RBSP rbsp = { NULL };
265 34105 H2645NAL nal = { NULL };
266 int buf_index, next_avc;
267 unsigned int pps_id;
268 unsigned int slice_type;
269 34105 int state = -1, got_reset = 0;
270
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 34105 int q264 = buf_size >=4 && !memcmp("Q264", buf, 4);
271 int field_poc[2];
272 int ret;
273
274 /* set some sane default values */
275 34105 s->pict_type = AV_PICTURE_TYPE_I;
276 34105 s->key_frame = 0;
277 34105 s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
278
279 34105 ff_h264_sei_uninit(&p->sei);
280 34105 p->sei.common.frame_packing.arrangement_cancel_flag = -1;
281 34105 p->sei.common.unregistered.x264_build = -1;
282
283
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 34105 if (!buf_size)
284 332 return 0;
285
286 33773 av_fast_padded_malloc(&rbsp.rbsp_buffer, &rbsp.rbsp_buffer_alloc_size, buf_size);
287
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 33773 if (!rbsp.rbsp_buffer)
288 ✗ return AVERROR(ENOMEM);
289
290 33773 buf_index = 0;
291
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 33773 next_avc = p->is_avc ? 0 : buf_size;
292 16669 for (;;) {
293 const SPS *sps;
294 50442 int src_length, consumed, nalsize = 0;
295
296
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 50442 if (buf_index >= next_avc) {
297 10895 nalsize = get_nalsize(p->nal_length_size, buf, buf_size, &buf_index, avctx);
298
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 10895 if (nalsize < 0)
299 332 break;
300 10563 next_avc = buf_index + nalsize;
301 } else {
302 39547 buf_index = find_start_code(buf, buf_size, buf_index, next_avc);
303
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 39547 if (buf_index >= buf_size)
304 ✗ break;
305
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 39547 if (buf_index >= next_avc)
306 ✗ continue;
307 }
308 50110 src_length = next_avc - buf_index;
309
310 50110 state = buf[buf_index];
311
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 50110 switch (state & 0x1f) {
312 33441 case H264_NAL_SLICE:
313 case H264_NAL_IDR_SLICE:
314 // Do not walk the whole buffer just to decode slice header
315
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 33441 if ((state & 0x1f) == H264_NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
316 /* IDR or disposable slice
317 * No need to decode many bytes because MMCOs shall not be present. */
318
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 12217 if (src_length > 60)
319 11813 src_length = 60;
320 } else {
321 /* To decode up to MMCOs */
322
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 21224 if (src_length > 1000)
323 11912 src_length = 1000;
324 }
325 33441 break;
326 }
327 50110 consumed = ff_h2645_extract_rbsp(buf + buf_index, src_length, &rbsp, &nal, 1);
328
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 50110 if (consumed < 0)
329 ✗ break;
330
331 50110 buf_index += consumed;
332
333 50110 ret = init_get_bits8(&nal.gb, nal.data, nal.size);
334
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 50110 if (ret < 0)
335 ✗ goto fail;
336 50110 get_bits1(&nal.gb);
337 50110 nal.ref_idc = get_bits(&nal.gb, 2);
338 50110 nal.type = get_bits(&nal.gb, 5);
339
340
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 50110 switch (nal.type) {
341 932 case H264_NAL_SPS:
342 932 ff_h264_decode_seq_parameter_set(&nal.gb, avctx, &p->ps, 0);
343 932 break;
344 7635 case H264_NAL_PPS:
345 7635 ff_h264_decode_picture_parameter_set(&nal.gb, avctx, &p->ps,
346 nal.size_bits);
347 7635 break;
348 4227 case H264_NAL_SEI:
349 4227 ff_h264_sei_decode(&p->sei, &nal.gb, &p->ps, avctx);
350 4227 break;
351 868 case H264_NAL_IDR_SLICE:
352 868 s->key_frame = 1;
353
354 868 p->poc.prev_frame_num = 0;
355 868 p->poc.prev_frame_num_offset = 0;
356 868 p->poc.prev_poc_msb =
357 868 p->poc.prev_poc_lsb = 0;
358 /* fall through */
359 33441 case H264_NAL_SLICE:
360 33441 get_ue_golomb_long(&nal.gb); // skip first_mb_in_slice
361 33441 slice_type = get_ue_golomb_31(&nal.gb);
362 33441 s->pict_type = ff_h264_golomb_to_pict_type[slice_type % 5];
363
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 33441 if (p->sei.recovery_point.recovery_frame_cnt >= 0) {
364 /* key frame, since recovery_frame_cnt is set */
365 205 s->key_frame = 1;
366 }
367 33441 pps_id = get_ue_golomb(&nal.gb);
368
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 33441 if (pps_id >= MAX_PPS_COUNT) {
369 ✗ av_log(avctx, AV_LOG_ERROR,
370 "pps_id %u out of range\n", pps_id);
371 ✗ goto fail;
372 }
373
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 33441 if (!p->ps.pps_list[pps_id]) {
374 568 av_log(avctx, AV_LOG_ERROR,
375 "non-existing PPS %u referenced\n", pps_id);
376 568 goto fail;
377 }
378
379 32873 av_refstruct_replace(&p->ps.pps, p->ps.pps_list[pps_id]);
380 32873 p->ps.sps = p->ps.pps->sps;
381 32873 sps = p->ps.sps;
382
383 // heuristic to detect non marked keyframes
384
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 32873 if (p->ps.sps->ref_frame_count <= 1 && p->ps.pps->ref_count[0] <= 1 && s->pict_type == AV_PICTURE_TYPE_I)
385 1029 s->key_frame = 1;
386
387 32873 p->poc.frame_num = get_bits(&nal.gb, sps->log2_max_frame_num);
388
389 32873 s->coded_width = 16 * sps->mb_width;
390 32873 s->coded_height = 16 * sps->mb_height;
391 32873 s->width = s->coded_width - (sps->crop_right + sps->crop_left);
392 32873 s->height = s->coded_height - (sps->crop_top + sps->crop_bottom);
393
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 32873 if (s->width <= 0 || s->height <= 0) {
394 ✗ s->width = s->coded_width;
395 ✗ s->height = s->coded_height;
396 }
397
398
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 32873 switch (sps->bit_depth_luma) {
399 150 case 9:
400
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 150 if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P9;
401
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 150 else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P9;
402 100 else s->format = AV_PIX_FMT_YUV420P9;
403 150 break;
404 288 case 10:
405
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 288 if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P10;
406
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 238 else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P10;
407 151 else s->format = AV_PIX_FMT_YUV420P10;
408 288 break;
409 32435 case 8:
410
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 32435 if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P;
411
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 31546 else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P;
412 31536 else s->format = AV_PIX_FMT_YUV420P;
413 32435 break;
414 ✗ default:
415 ✗ s->format = AV_PIX_FMT_NONE;
416 }
417
418 32873 avctx->profile = ff_h264_get_profile(sps);
419 32873 avctx->level = sps->level_idc;
420
421
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 32873 if (sps->frame_mbs_only_flag) {
422 23425 p->picture_structure = PICT_FRAME;
423 } else {
424
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 9448 if (get_bits1(&nal.gb)) { // field_pic_flag
425 6487 p->picture_structure = PICT_TOP_FIELD + get_bits1(&nal.gb); // bottom_field_flag
426 } else {
427 2961 p->picture_structure = PICT_FRAME;
428 }
429 }
430
431
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 32873 if (nal.type == H264_NAL_IDR_SLICE)
432 866 get_ue_golomb_long(&nal.gb); /* idr_pic_id */
433
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 32873 if (sps->poc_type == 0) {
434 24929 p->poc.poc_lsb = get_bits(&nal.gb, sps->log2_max_poc_lsb);
435
436
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 24929 if (p->ps.pps->pic_order_present == 1 &&
437
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 4225 p->picture_structure == PICT_FRAME)
438 3270 p->poc.delta_poc_bottom = get_se_golomb(&nal.gb);
439 }
440
441
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 32873 if (sps->poc_type == 1 &&
442
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 3245 !sps->delta_pic_order_always_zero_flag) {
443 3071 p->poc.delta_poc[0] = get_se_golomb(&nal.gb);
444
445
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 3071 if (p->ps.pps->pic_order_present == 1 &&
446
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 692 p->picture_structure == PICT_FRAME)
447 406 p->poc.delta_poc[1] = get_se_golomb(&nal.gb);
448 }
449
450 /* Decode POC of this picture.
451 * The prev_ values needed for decoding POC of the next picture are not set here. */
452 32873 field_poc[0] = field_poc[1] = INT_MAX;
453 32873 ret = ff_h264_init_poc(field_poc, &s->output_picture_number, sps,
454 &p->poc, p->picture_structure, nal.ref_idc);
455
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 32873 if (ret < 0)
456 ✗ goto fail;
457
458 /* Continue parsing to check if MMCO_RESET is present.
459 * FIXME: MMCO_RESET could appear in non-first slice.
460 * Maybe, we should parse all undisposable non-IDR slice of this
461 * picture until encountering MMCO_RESET in a slice of it. */
462
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 32873 if (nal.ref_idc && nal.type != H264_NAL_IDR_SLICE) {
463 20682 got_reset = scan_mmco_reset(s, &nal.gb, avctx);
464
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 20682 if (got_reset < 0)
465 ✗ goto fail;
466 }
467
468 /* Set up the prev_ values for decoding POC of the next picture. */
469
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 32873 p->poc.prev_frame_num = got_reset ? 0 : p->poc.frame_num;
470
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 32873 p->poc.prev_frame_num_offset = got_reset ? 0 : p->poc.frame_num_offset;
471
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 32873 if (nal.ref_idc != 0) {
472
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 21548 if (!got_reset) {
473 21498 p->poc.prev_poc_msb = p->poc.poc_msb;
474 21498 p->poc.prev_poc_lsb = p->poc.poc_lsb;
475 } else {
476 50 p->poc.prev_poc_msb = 0;
477 50 p->poc.prev_poc_lsb =
478
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 50 p->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
479 }
480 }
481
482
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 32873 if (p->sei.picture_timing.present) {
483 2989 ret = ff_h264_sei_process_picture_timing(&p->sei.picture_timing,
484 sps, avctx);
485
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 2989 if (ret < 0) {
486 ✗ av_log(avctx, AV_LOG_ERROR, "Error processing the picture timing SEI\n");
487 ✗ p->sei.picture_timing.present = 0;
488 }
489 }
490
491
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 32873 if (sps->pic_struct_present_flag && p->sei.picture_timing.present) {
492
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 2977 switch (p->sei.picture_timing.pic_struct) {
493 831 case H264_SEI_PIC_STRUCT_TOP_FIELD:
494 case H264_SEI_PIC_STRUCT_BOTTOM_FIELD:
495 831 s->repeat_pict = 0;
496 831 break;
497 2008 case H264_SEI_PIC_STRUCT_FRAME:
498 case H264_SEI_PIC_STRUCT_TOP_BOTTOM:
499 case H264_SEI_PIC_STRUCT_BOTTOM_TOP:
500 2008 s->repeat_pict = 1;
501 2008 break;
502 138 case H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
503 case H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
504 138 s->repeat_pict = 2;
505 138 break;
506 ✗ case H264_SEI_PIC_STRUCT_FRAME_DOUBLING:
507 ✗ s->repeat_pict = 3;
508 ✗ break;
509 ✗ case H264_SEI_PIC_STRUCT_FRAME_TRIPLING:
510 ✗ s->repeat_pict = 5;
511 ✗ break;
512 ✗ default:
513 ✗ s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
514 ✗ break;
515 }
516 } else {
517 29896 s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
518 }
519
520
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 32873 if (p->picture_structure == PICT_FRAME) {
521 26386 s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
522
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 26386 if (sps->pic_struct_present_flag && p->sei.picture_timing.present) {
523
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 2146 switch (p->sei.picture_timing.pic_struct) {
524 1421 case H264_SEI_PIC_STRUCT_TOP_BOTTOM:
525 case H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
526 1421 s->field_order = AV_FIELD_TT;
527 1421 break;
528 150 case H264_SEI_PIC_STRUCT_BOTTOM_TOP:
529 case H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
530 150 s->field_order = AV_FIELD_BB;
531 150 break;
532 575 default:
533 575 s->field_order = AV_FIELD_PROGRESSIVE;
534 575 break;
535 }
536 } else {
537
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 24240 if (field_poc[0] < field_poc[1])
538 1041 s->field_order = AV_FIELD_TT;
539
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 23199 else if (field_poc[0] > field_poc[1])
540 3 s->field_order = AV_FIELD_BB;
541 else
542 23196 s->field_order = AV_FIELD_PROGRESSIVE;
543 }
544 } else {
545
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 6487 if (p->picture_structure == PICT_TOP_FIELD)
546 3341 s->picture_structure = AV_PICTURE_STRUCTURE_TOP_FIELD;
547 else
548 3146 s->picture_structure = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
549
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 6487 if (p->poc.frame_num == p->last_frame_num &&
550
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 4884 p->last_picture_structure != AV_PICTURE_STRUCTURE_UNKNOWN &&
551
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 4884 p->last_picture_structure != AV_PICTURE_STRUCTURE_FRAME &&
552
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 4884 p->last_picture_structure != s->picture_structure) {
553
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 4760 if (p->last_picture_structure == AV_PICTURE_STRUCTURE_TOP_FIELD)
554 3140 s->field_order = AV_FIELD_TT;
555 else
556 1620 s->field_order = AV_FIELD_BB;
557 } else {
558 1727 s->field_order = AV_FIELD_UNKNOWN;
559 }
560 6487 p->last_picture_structure = s->picture_structure;
561 6487 p->last_frame_num = p->poc.frame_num;
562 }
563
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 32873 if (sps->timing_info_present_flag) {
564 9778 int64_t den = sps->time_scale;
565
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 9778 if (p->sei.common.unregistered.x264_build < 44U)
566 ✗ den *= 2;
567 9778 av_reduce(&avctx->framerate.den, &avctx->framerate.num,
568 9778 sps->num_units_in_tick * 2, den, 1 << 30);
569 }
570
571 32873 av_freep(&rbsp.rbsp_buffer);
572 32873 return 0; /* no need to evaluate the rest */
573 }
574 }
575
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 332 if (q264) {
576 ✗ av_freep(&rbsp.rbsp_buffer);
577 ✗ return 0;
578 }
579 /* didn't find a picture! */
580 332 av_log(avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
581 900 fail:
582 900 av_freep(&rbsp.rbsp_buffer);
583 900 return -1;
584 }
585
586 193312 static int h264_parse(AVCodecParserContext *s,
587 AVCodecContext *avctx,
588 const uint8_t **poutbuf, int *poutbuf_size,
589 const uint8_t *buf, int buf_size)
590 {
591 193312 H264ParseContext *p = s->priv_data;
592 193312 ParseContext *pc = &p->pc;
593 193312 AVRational time_base = { 0, 1 };
594 int next;
595
596
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 193312 if (!p->got_first) {
597 453 p->got_first = 1;
598
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 453 if (avctx->extradata_size) {
599 221 ff_h264_decode_extradata(avctx->extradata, avctx->extradata_size,
600 &p->ps, &p->is_avc, &p->nal_length_size,
601 avctx->err_recognition, avctx);
602 }
603 }
604
605
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 193312 if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
606 7008 next = buf_size;
607 } else {
608 186304 next = h264_find_frame_end(p, buf, buf_size, avctx);
609
610
2/2
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 186304 if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
611 159207 *poutbuf = NULL;
612 159207 *poutbuf_size = 0;
613 159207 return buf_size;
614 }
615
616
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 27097 if (next < 0 && next != END_NOT_FOUND) {
617 av_assert1(pc->last_index + next >= 0);
618 120 h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next, avctx); // update state
619 }
620 }
621
622 34105 parse_nal_units(s, avctx, buf, buf_size);
623
624
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 34105 if (avctx->framerate.num)
625 10218 time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){2, 1}));
626
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 34105 if (p->sei.picture_timing.cpb_removal_delay >= 0) {
627 1957 s->dts_sync_point = p->sei.buffering_period.present;
628 1957 s->dts_ref_dts_delta = p->sei.picture_timing.cpb_removal_delay;
629 1957 s->pts_dts_delta = p->sei.picture_timing.dpb_output_delay;
630 } else {
631 32148 s->dts_sync_point = INT_MIN;
632 32148 s->dts_ref_dts_delta = INT_MIN;
633 32148 s->pts_dts_delta = INT_MIN;
634 }
635
636
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 34105 if (s->flags & PARSER_FLAG_ONCE) {
637 ✗ s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
638 }
639
640
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 34105 if (s->dts_sync_point >= 0) {
641 1957 int64_t den = time_base.den * (int64_t)avctx->pkt_timebase.num;
642
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 1957 if (den > 0) {
643 1957 int64_t num = time_base.num * (int64_t)avctx->pkt_timebase.den;
644
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 1957 if (s->dts != AV_NOPTS_VALUE) {
645 // got DTS from the stream, update reference timestamp
646 1555 p->reference_dts = av_sat_sub64(s->dts, av_rescale(s->dts_ref_dts_delta, num, den));
647
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 402 } else if (p->reference_dts != AV_NOPTS_VALUE) {
648 // compute DTS based on reference timestamp
649 ✗ s->dts = av_sat_add64(p->reference_dts, av_rescale(s->dts_ref_dts_delta, num, den));
650 }
651
652
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 1957 if (p->reference_dts != AV_NOPTS_VALUE && s->pts == AV_NOPTS_VALUE)
653 ✗ s->pts = s->dts + av_rescale(s->pts_dts_delta, num, den);
654
655
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 1957 if (s->dts_sync_point > 0)
656 135 p->reference_dts = s->dts; // new reference
657 }
658 }
659
660 34105 *poutbuf = buf;
661 34105 *poutbuf_size = buf_size;
662 34105 return next;
663 }
664
665 456 static av_cold void h264_close(AVCodecParserContext *s)
666 {
667 456 H264ParseContext *p = s->priv_data;
668 456 ParseContext *pc = &p->pc;
669
670 456 av_freep(&pc->buffer);
671
672 456 ff_h264_sei_uninit(&p->sei);
673 456 ff_h264_ps_uninit(&p->ps);
674 456 }
675
676 456 static av_cold int init(AVCodecParserContext *s)
677 {
678 456 H264ParseContext *p = s->priv_data;
679
680 456 p->reference_dts = AV_NOPTS_VALUE;
681 456 p->last_frame_num = INT_MAX;
682 456 ff_h264dsp_init(&p->h264dsp, 8, 1);
683 456 return 0;
684 }
685
686 const FFCodecParser ff_h264_parser = {
687 PARSER_CODEC_LIST(AV_CODEC_ID_H264),
688 .priv_data_size = sizeof(H264ParseContext),
689 .init = init,
690 .parse = h264_parse,
691 .close = h264_close,
692 };
693