FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/h264_parser.c
Date: 2026-04-21 18:58:04
Exec Total Coverage
Lines: 338 392 86.2%
Functions: 7 7 100.0%
Branches: 244 295 82.7%
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 40028 static int find_start_code(const uint8_t *buf, int buf_size,
73 int buf_index, int next_avc)
74 {
75 40028 uint32_t state = -1;
76
77 40028 buf_index = avpriv_find_start_code(buf + buf_index, buf + next_avc + 1, &state) - buf - 1;
78
79 40028 return FFMIN(buf_index, buf_size);
80 }
81
82 187409 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 187409 ParseContext *pc = &p->pc;
88
89
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 187409 int next_avc = p->is_avc ? 0 : buf_size;
90 // mb_addr= pc->mb_addr - 1;
91 187409 state = pc->state;
92
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 187409 if (state > 13)
93 98 state = 7;
94
95
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 187409 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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 2744629 for (i = 0; i < buf_size; i++) {
99
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 2584297 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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 2584297 if (state == 7) {
114 1211913 i += p->h264dsp.startcode_find_candidate(buf + i, next_avc - i);
115
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 1211913 if (i < next_avc)
116 1054387 state = 2;
117
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 1372384 } else if (state <= 2) {
118
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 1230143 if (buf[i] == 1)
119 101114 state ^= 5; // 2->7, 1->4, 0->5
120
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 1129029 else if (buf[i])
121 953528 state = 7;
122 else
123 175501 state >>= 1; // 2->1, 1->0, 0->0
124
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 142241 } else if (state <= 5) {
125 76147 int nalu_type = buf[i] & 0x1F;
126
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 76147 if (nalu_type == H264_NAL_SEI || nalu_type == H264_NAL_SPS ||
127
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 59535 nalu_type == H264_NAL_PPS || nalu_type == H264_NAL_AUD) {
128
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 21232 if (pc->frame_start_found) {
129 8791 i++;
130 8791 goto found;
131 }
132
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 54915 } else if (nalu_type == H264_NAL_SLICE || nalu_type == H264_NAL_DPA ||
133 nalu_type == H264_NAL_IDR_SLICE) {
134 54381 state += 8;
135 54381 continue;
136 }
137 12975 state = 7;
138 } else {
139 66094 unsigned int mb, last_mb = p->parse_last_mb;
140 GetBitContext gb;
141 66094 p->parse_history[p->parse_history_count++] = buf[i];
142
143 66094 init_get_bits(&gb, p->parse_history, 8*p->parse_history_count);
144 66094 mb= get_ue_golomb_long(&gb);
145
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 66094 if (get_bits_left(&gb) > 0 || p->parse_history_count > 5) {
146 54381 p->parse_last_mb = mb;
147
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 54381 if (pc->frame_start_found) {
148
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 27067 if (mb <= last_mb) {
149 18286 i -= p->parse_history_count - 1;
150 18286 p->parse_history_count = 0;
151 18286 goto found;
152 }
153 } else
154 27314 pc->frame_start_found = 1;
155 36095 p->parse_history_count = 0;
156 36095 state = 7;
157 }
158 }
159 }
160 160332 pc->state = state;
161
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 160332 if (p->is_avc)
162 ✗ return next_avc;
163 160332 return END_NOT_FOUND;
164
165 27077 found:
166 27077 pc->state = 7;
167 27077 pc->frame_start_found = 0;
168
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 27077 if (p->is_avc)
169 ✗ return next_avc;
170 27077 return i - (state & 5);
171 }
172
173 21074 static int scan_mmco_reset(AVCodecParserContext *s, GetBitContext *gb,
174 void *logctx)
175 {
176 H264PredWeightTable pwt;
177 21074 int slice_type_nos = s->pict_type & 3;
178 21074 H264ParseContext *p = s->priv_data;
179 int list_count, ref_count[2];
180
181
182
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 21074 if (p->ps.pps->redundant_pic_cnt_present)
183 ✗ get_ue_golomb(gb); // redundant_pic_count
184
185
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 21074 if (slice_type_nos == AV_PICTURE_TYPE_B)
186 1152 get_bits1(gb); // direct_spatial_mv_pred
187
188
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 21074 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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 21074 if (slice_type_nos != AV_PICTURE_TYPE_I) {
193 int list;
194
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 39646 for (list = 0; list < list_count; list++) {
195
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 20399 if (get_bits1(gb)) {
196 int index;
197 15198 for (index = 0; ; index++) {
198 15198 unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(gb);
199
200
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 15198 if (reordering_of_pic_nums_idc < 3)
201 12031 get_ue_golomb_long(gb);
202
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 3167 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 3167 break;
209
210
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 12031 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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 21074 if ((p->ps.pps->weighted_pred && slice_type_nos == AV_PICTURE_TYPE_P) ||
221
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 17335 (p->ps.pps->weighted_bipred_idc == 1 && slice_type_nos == AV_PICTURE_TYPE_B))
222 3763 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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 21074 if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
226 int i;
227
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 6239 for (i = 0; i < H264_MAX_MMCO_COUNT; i++) {
228
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 6239 if (get_bits_left(gb) < 1)
229 ✗ return AVERROR_INVALIDDATA;
230
231 6239 MMCOOpcode opcode = get_ue_golomb_31(gb);
232
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 6239 if (opcode > (unsigned) MMCO_LONG) {
233 ✗ av_log(logctx, AV_LOG_ERROR,
234 "illegal memory management control operation %d\n",
235 opcode);
236 ✗ return AVERROR_INVALIDDATA;
237 }
238
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 6239 if (opcode == MMCO_END)
239 2104 return 0;
240
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 4135 else if (opcode == MMCO_RESET)
241 50 return 1;
242
243
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 4085 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
244 3610 get_ue_golomb_long(gb); // difference_of_pic_nums_minus1
245
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 4085 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
246
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 3656 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
247 808 get_ue_golomb_31(gb);
248 }
249 }
250
251 18920 return 0;
252 }
253
254 /**
255 * Parse NAL units of found picture and decode some basic information.
256 *
257 * @param s parser context.
258 * @param avctx codec context.
259 * @param buf buffer with field/frame data.
260 * @param buf_size size of the buffer.
261 */
262 34765 static inline int parse_nal_units(AVCodecParserContext *s,
263 AVCodecContext *avctx,
264 const uint8_t * const buf, int buf_size)
265 {
266 34765 H264ParseContext *p = s->priv_data;
267 34765 H2645RBSP rbsp = { NULL };
268 34765 H2645NAL nal = { NULL };
269 int buf_index, next_avc;
270 unsigned int pps_id;
271 unsigned int slice_type;
272 34765 int state = -1, got_reset = 0;
273
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 34765 int q264 = buf_size >=4 && !memcmp("Q264", buf, 4);
274 int field_poc[2];
275 int ret;
276
277 /* set some sane default values */
278 34765 s->pict_type = AV_PICTURE_TYPE_I;
279 34765 s->key_frame = 0;
280 34765 s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
281
282 34765 ff_h264_sei_uninit(&p->sei);
283 34765 p->sei.common.frame_packing.arrangement_cancel_flag = -1;
284 34765 p->sei.common.unregistered.x264_build = -1;
285
286
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 34765 if (!buf_size)
287 337 return 0;
288
289 34428 av_fast_padded_malloc(&rbsp.rbsp_buffer, &rbsp.rbsp_buffer_alloc_size, buf_size);
290
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 34428 if (!rbsp.rbsp_buffer)
291 ✗ return AVERROR(ENOMEM);
292
293 34428 buf_index = 0;
294
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 34428 next_avc = p->is_avc ? 0 : buf_size;
295 16847 for (;;) {
296 const SPS *sps;
297 51275 int src_length, consumed, nalsize = 0;
298
299
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 51275 if (buf_index >= next_avc) {
300 11247 nalsize = get_nalsize(p->nal_length_size, buf, buf_size, &buf_index, avctx);
301
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 11247 if (nalsize < 0)
302 332 break;
303 10915 next_avc = buf_index + nalsize;
304 } else {
305 40028 buf_index = find_start_code(buf, buf_size, buf_index, next_avc);
306
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 40028 if (buf_index >= buf_size)
307 ✗ break;
308
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 40028 if (buf_index >= next_avc)
309 ✗ continue;
310 }
311 50943 src_length = next_avc - buf_index;
312
313 50943 state = buf[buf_index];
314
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 50943 switch (state & 0x1f) {
315 34096 case H264_NAL_SLICE:
316 case H264_NAL_IDR_SLICE:
317 // Do not walk the whole buffer just to decode slice header
318
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 34096 if ((state & 0x1f) == H264_NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
319 /* IDR or disposable slice
320 * No need to decode many bytes because MMCOs shall not be present. */
321
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 12480 if (src_length > 60)
322 12052 src_length = 60;
323 } else {
324 /* To decode up to MMCOs */
325
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 21616 if (src_length > 1000)
326 12142 src_length = 1000;
327 }
328 34096 break;
329 }
330 50943 consumed = ff_h2645_extract_rbsp(buf + buf_index, src_length, &rbsp, &nal, 1);
331
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 50943 if (consumed < 0)
332 ✗ break;
333
334 50943 buf_index += consumed;
335
336 50943 ret = init_get_bits8(&nal.gb, nal.data, nal.size);
337
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 50943 if (ret < 0)
338 ✗ goto fail;
339 50943 get_bits1(&nal.gb);
340 50943 nal.ref_idc = get_bits(&nal.gb, 2);
341 50943 nal.type = get_bits(&nal.gb, 5);
342
343
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 50943 switch (nal.type) {
344 944 case H264_NAL_SPS:
345 944 ff_h264_decode_seq_parameter_set(&nal.gb, avctx, &p->ps, 0);
346 944 break;
347 7647 case H264_NAL_PPS:
348 7647 ff_h264_decode_picture_parameter_set(&nal.gb, avctx, &p->ps,
349 nal.size_bits);
350 7647 break;
351 4381 case H264_NAL_SEI:
352 4381 ff_h264_sei_decode(&p->sei, &nal.gb, &p->ps, avctx);
353 4381 break;
354 931 case H264_NAL_IDR_SLICE:
355 931 s->key_frame = 1;
356
357 931 p->poc.prev_frame_num = 0;
358 931 p->poc.prev_frame_num_offset = 0;
359 931 p->poc.prev_poc_msb =
360 931 p->poc.prev_poc_lsb = 0;
361 /* fall through */
362 34096 case H264_NAL_SLICE:
363 34096 get_ue_golomb_long(&nal.gb); // skip first_mb_in_slice
364 34096 slice_type = get_ue_golomb_31(&nal.gb);
365 34096 s->pict_type = ff_h264_golomb_to_pict_type[slice_type % 5];
366
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 34096 if (p->sei.recovery_point.recovery_frame_cnt >= 0) {
367 /* key frame, since recovery_frame_cnt is set */
368 213 s->key_frame = 1;
369 }
370 34096 pps_id = get_ue_golomb(&nal.gb);
371
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 34096 if (pps_id >= MAX_PPS_COUNT) {
372 ✗ av_log(avctx, AV_LOG_ERROR,
373 "pps_id %u out of range\n", pps_id);
374 ✗ goto fail;
375 }
376
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 34096 if (!p->ps.pps_list[pps_id]) {
377 568 av_log(avctx, AV_LOG_ERROR,
378 "non-existing PPS %u referenced\n", pps_id);
379 568 goto fail;
380 }
381
382 33528 av_refstruct_replace(&p->ps.pps, p->ps.pps_list[pps_id]);
383 33528 p->ps.sps = p->ps.pps->sps;
384 33528 sps = p->ps.sps;
385
386 // heuristic to detect non marked keyframes
387
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 33528 if (p->ps.sps->ref_frame_count <= 1 && p->ps.pps->ref_count[0] <= 1 && s->pict_type == AV_PICTURE_TYPE_I)
388 1080 s->key_frame = 1;
389
390 33528 p->poc.frame_num = get_bits(&nal.gb, sps->log2_max_frame_num);
391
392 33528 s->coded_width = 16 * sps->mb_width;
393 33528 s->coded_height = 16 * sps->mb_height;
394 33528 s->width = s->coded_width - (sps->crop_right + sps->crop_left);
395 33528 s->height = s->coded_height - (sps->crop_top + sps->crop_bottom);
396
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 33528 if (s->width <= 0 || s->height <= 0) {
397 ✗ s->width = s->coded_width;
398 ✗ s->height = s->coded_height;
399 }
400
401
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 33528 switch (sps->bit_depth_luma) {
402 150 case 9:
403
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 150 if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P9;
404
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 150 else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P9;
405 100 else s->format = AV_PIX_FMT_YUV420P9;
406 150 break;
407 285 case 10:
408
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 285 if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P10;
409
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 235 else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P10;
410 148 else s->format = AV_PIX_FMT_YUV420P10;
411 285 break;
412 33093 case 8:
413
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 33093 if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P;
414
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 32204 else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P;
415 32194 else s->format = AV_PIX_FMT_YUV420P;
416 33093 break;
417 ✗ default:
418 ✗ s->format = AV_PIX_FMT_NONE;
419 }
420
421 33528 avctx->profile = ff_h264_get_profile(sps);
422 33528 avctx->level = sps->level_idc;
423
424
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 33528 if (sps->frame_mbs_only_flag) {
425 24080 p->picture_structure = PICT_FRAME;
426 } else {
427
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 9448 if (get_bits1(&nal.gb)) { // field_pic_flag
428 6487 p->picture_structure = PICT_TOP_FIELD + get_bits1(&nal.gb); // bottom_field_flag
429 } else {
430 2961 p->picture_structure = PICT_FRAME;
431 }
432 }
433
434
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 33528 if (nal.type == H264_NAL_IDR_SLICE)
435 929 get_ue_golomb_long(&nal.gb); /* idr_pic_id */
436
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 33528 if (sps->poc_type == 0) {
437 25449 p->poc.poc_lsb = get_bits(&nal.gb, sps->log2_max_poc_lsb);
438
439
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 25449 if (p->ps.pps->pic_order_present == 1 &&
440
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 4225 p->picture_structure == PICT_FRAME)
441 3270 p->poc.delta_poc_bottom = get_se_golomb(&nal.gb);
442 }
443
444
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 33528 if (sps->poc_type == 1 &&
445
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 3245 !sps->delta_pic_order_always_zero_flag) {
446 3071 p->poc.delta_poc[0] = get_se_golomb(&nal.gb);
447
448
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 3071 if (p->ps.pps->pic_order_present == 1 &&
449
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 692 p->picture_structure == PICT_FRAME)
450 406 p->poc.delta_poc[1] = get_se_golomb(&nal.gb);
451 }
452
453 /* Decode POC of this picture.
454 * The prev_ values needed for decoding POC of the next picture are not set here. */
455 33528 field_poc[0] = field_poc[1] = INT_MAX;
456 33528 ret = ff_h264_init_poc(field_poc, &s->output_picture_number, sps,
457 &p->poc, p->picture_structure, nal.ref_idc);
458
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 33528 if (ret < 0)
459 ✗ goto fail;
460
461 /* Continue parsing to check if MMCO_RESET is present.
462 * FIXME: MMCO_RESET could appear in non-first slice.
463 * Maybe, we should parse all undisposable non-IDR slice of this
464 * picture until encountering MMCO_RESET in a slice of it. */
465
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 33528 if (nal.ref_idc && nal.type != H264_NAL_IDR_SLICE) {
466 21074 got_reset = scan_mmco_reset(s, &nal.gb, avctx);
467
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 21074 if (got_reset < 0)
468 ✗ goto fail;
469 }
470
471 /* Set up the prev_ values for decoding POC of the next picture. */
472
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 33528 p->poc.prev_frame_num = got_reset ? 0 : p->poc.frame_num;
473
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 33528 p->poc.prev_frame_num_offset = got_reset ? 0 : p->poc.frame_num_offset;
474
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 33528 if (nal.ref_idc != 0) {
475
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 22003 if (!got_reset) {
476 21953 p->poc.prev_poc_msb = p->poc.poc_msb;
477 21953 p->poc.prev_poc_lsb = p->poc.poc_lsb;
478 } else {
479 50 p->poc.prev_poc_msb = 0;
480 50 p->poc.prev_poc_lsb =
481
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 50 p->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
482 }
483 }
484
485
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 33528 if (p->sei.picture_timing.present) {
486 3085 ret = ff_h264_sei_process_picture_timing(&p->sei.picture_timing,
487 sps, avctx);
488
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 3085 if (ret < 0) {
489 ✗ av_log(avctx, AV_LOG_ERROR, "Error processing the picture timing SEI\n");
490 ✗ p->sei.picture_timing.present = 0;
491 }
492 }
493
494
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 33528 if (sps->pic_struct_present_flag && p->sei.picture_timing.present) {
495
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 3073 switch (p->sei.picture_timing.pic_struct) {
496 831 case H264_SEI_PIC_STRUCT_TOP_FIELD:
497 case H264_SEI_PIC_STRUCT_BOTTOM_FIELD:
498 831 s->repeat_pict = 0;
499 831 break;
500 2104 case H264_SEI_PIC_STRUCT_FRAME:
501 case H264_SEI_PIC_STRUCT_TOP_BOTTOM:
502 case H264_SEI_PIC_STRUCT_BOTTOM_TOP:
503 2104 s->repeat_pict = 1;
504 2104 break;
505 138 case H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
506 case H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
507 138 s->repeat_pict = 2;
508 138 break;
509 ✗ case H264_SEI_PIC_STRUCT_FRAME_DOUBLING:
510 ✗ s->repeat_pict = 3;
511 ✗ break;
512 ✗ case H264_SEI_PIC_STRUCT_FRAME_TRIPLING:
513 ✗ s->repeat_pict = 5;
514 ✗ break;
515 ✗ default:
516 ✗ s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
517 ✗ break;
518 }
519 } else {
520 30455 s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
521 }
522
523
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 33528 if (p->picture_structure == PICT_FRAME) {
524 27041 s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
525
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 27041 if (sps->pic_struct_present_flag && p->sei.picture_timing.present) {
526
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 2242 switch (p->sei.picture_timing.pic_struct) {
527 1421 case H264_SEI_PIC_STRUCT_TOP_BOTTOM:
528 case H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
529 1421 s->field_order = AV_FIELD_TT;
530 1421 break;
531 150 case H264_SEI_PIC_STRUCT_BOTTOM_TOP:
532 case H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
533 150 s->field_order = AV_FIELD_BB;
534 150 break;
535 671 default:
536 671 s->field_order = AV_FIELD_PROGRESSIVE;
537 671 break;
538 }
539 } else {
540
2/2
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 24799 if (field_poc[0] < field_poc[1])
541 1041 s->field_order = AV_FIELD_TT;
542
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 23758 else if (field_poc[0] > field_poc[1])
543 3 s->field_order = AV_FIELD_BB;
544 else
545 23755 s->field_order = AV_FIELD_PROGRESSIVE;
546 }
547 } else {
548
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 6487 if (p->picture_structure == PICT_TOP_FIELD)
549 3341 s->picture_structure = AV_PICTURE_STRUCTURE_TOP_FIELD;
550 else
551 3146 s->picture_structure = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
552
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 6487 if (p->poc.frame_num == p->last_frame_num &&
553
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 4884 p->last_picture_structure != AV_PICTURE_STRUCTURE_UNKNOWN &&
554
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 4884 p->last_picture_structure != AV_PICTURE_STRUCTURE_FRAME &&
555
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 4884 p->last_picture_structure != s->picture_structure) {
556
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 4760 if (p->last_picture_structure == AV_PICTURE_STRUCTURE_TOP_FIELD)
557 3140 s->field_order = AV_FIELD_TT;
558 else
559 1620 s->field_order = AV_FIELD_BB;
560 } else {
561 1727 s->field_order = AV_FIELD_UNKNOWN;
562 }
563 6487 p->last_picture_structure = s->picture_structure;
564 6487 p->last_frame_num = p->poc.frame_num;
565 }
566
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 33528 if (sps->timing_info_present_flag) {
567 10433 int64_t den = sps->time_scale;
568
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 10433 if (p->sei.common.unregistered.x264_build < 44U)
569 ✗ den *= 2;
570 10433 av_reduce(&avctx->framerate.den, &avctx->framerate.num,
571 10433 sps->num_units_in_tick * 2, den, 1 << 30);
572 }
573
574 33528 av_freep(&rbsp.rbsp_buffer);
575 33528 return 0; /* no need to evaluate the rest */
576 }
577 }
578
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 332 if (q264) {
579 ✗ av_freep(&rbsp.rbsp_buffer);
580 ✗ return 0;
581 }
582 /* didn't find a picture! */
583 332 av_log(avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
584 900 fail:
585 900 av_freep(&rbsp.rbsp_buffer);
586 900 return -1;
587 }
588
589 194505 static int h264_parse(AVCodecParserContext *s,
590 AVCodecContext *avctx,
591 const uint8_t **poutbuf, int *poutbuf_size,
592 const uint8_t *buf, int buf_size)
593 {
594 194505 H264ParseContext *p = s->priv_data;
595 194505 ParseContext *pc = &p->pc;
596 194505 AVRational time_base = { 0, 1 };
597 int next;
598
599
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 194505 if (!p->got_first) {
600 460 p->got_first = 1;
601
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 460 if (avctx->extradata_size) {
602 227 ff_h264_decode_extradata(avctx->extradata, avctx->extradata_size,
603 &p->ps, &p->is_avc, &p->nal_length_size,
604 avctx->err_recognition, avctx);
605 }
606 }
607
608
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 194505 if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
609 7218 next = buf_size;
610 } else {
611 187287 next = h264_find_frame_end(p, buf, buf_size, avctx);
612
613
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 187287 if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
614 159740 *poutbuf = NULL;
615 159740 *poutbuf_size = 0;
616 159740 return buf_size;
617 }
618
619
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 27547 if (next < 0 && next != END_NOT_FOUND) {
620 av_assert1(pc->last_index + next >= 0);
621 122 h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next, avctx); // update state
622 }
623 }
624
625 34765 parse_nal_units(s, avctx, buf, buf_size);
626
627
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 34765 if (avctx->framerate.num)
628 10877 time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){2, 1}));
629
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 34765 if (p->sei.picture_timing.cpb_removal_delay >= 0) {
630 2053 s->dts_sync_point = p->sei.buffering_period.present;
631 2053 s->dts_ref_dts_delta = p->sei.picture_timing.cpb_removal_delay;
632 2053 s->pts_dts_delta = p->sei.picture_timing.dpb_output_delay;
633 } else {
634 32712 s->dts_sync_point = INT_MIN;
635 32712 s->dts_ref_dts_delta = INT_MIN;
636 32712 s->pts_dts_delta = INT_MIN;
637 }
638
639
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 34765 if (s->flags & PARSER_FLAG_ONCE) {
640 ✗ s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
641 }
642
643
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 34765 if (s->dts_sync_point >= 0) {
644 2053 int64_t den = time_base.den * (int64_t)avctx->pkt_timebase.num;
645
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 2053 if (den > 0) {
646 2053 int64_t num = time_base.num * (int64_t)avctx->pkt_timebase.den;
647
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 2053 if (s->dts != AV_NOPTS_VALUE) {
648 // got DTS from the stream, update reference timestamp
649 1651 p->reference_dts = av_sat_sub64(s->dts, av_rescale(s->dts_ref_dts_delta, num, den));
650
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 402 } else if (p->reference_dts != AV_NOPTS_VALUE) {
651 // compute DTS based on reference timestamp
652 ✗ s->dts = av_sat_add64(p->reference_dts, av_rescale(s->dts_ref_dts_delta, num, den));
653 }
654
655
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 2053 if (p->reference_dts != AV_NOPTS_VALUE && s->pts == AV_NOPTS_VALUE) {
656 ✗ int64_t pts_dts_delta = av_rescale(s->pts_dts_delta, num, den);
657 ✗ uint64_t pts = (uint64_t)s->dts + pts_dts_delta;
658 ✗ if (pts == av_sat_add64(s->dts, pts_dts_delta))
659 ✗ s->pts = pts;
660 }
661
662
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 2053 if (s->dts_sync_point > 0)
663 184 p->reference_dts = s->dts; // new reference
664 }
665 }
666
667 34765 *poutbuf = buf;
668 34765 *poutbuf_size = buf_size;
669 34765 return next;
670 }
671
672 463 static av_cold void h264_close(AVCodecParserContext *s)
673 {
674 463 H264ParseContext *p = s->priv_data;
675 463 ParseContext *pc = &p->pc;
676
677 463 av_freep(&pc->buffer);
678
679 463 ff_h264_sei_uninit(&p->sei);
680 463 ff_h264_ps_uninit(&p->ps);
681 463 }
682
683 463 static av_cold int init(AVCodecParserContext *s)
684 {
685 463 H264ParseContext *p = s->priv_data;
686
687 463 p->reference_dts = AV_NOPTS_VALUE;
688 463 p->last_frame_num = INT_MAX;
689 463 ff_h264dsp_init(&p->h264dsp, 8, 1);
690 463 return 0;
691 }
692
693 const FFCodecParser ff_h264_parser = {
694 PARSER_CODEC_LIST(AV_CODEC_ID_H264),
695 .priv_data_size = sizeof(H264ParseContext),
696 .init = init,
697 .parse = h264_parse,
698 .close = h264_close,
699 };
700