FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/h264_parser.c
Date: 2025-07-08 13:42:56
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/avutil.h"
33 #include "libavutil/error.h"
34 #include "libavutil/log.h"
35 #include "libavutil/mem.h"
36 #include "libavutil/pixfmt.h"
37
38 #include "avcodec.h"
39 #include "get_bits.h"
40 #include "golomb.h"
41 #include "h264.h"
42 #include "h264dsp.h"
43 #include "h264_parse.h"
44 #include "h264_sei.h"
45 #include "h264_ps.h"
46 #include "h2645_parse.h"
47 #include "h264data.h"
48 #include "mpegutils.h"
49 #include "parser.h"
50 #include "libavutil/refstruct.h"
51 #include "startcode.h"
52
53 typedef struct H264ParseContext {
54 ParseContext pc;
55 H264ParamSets ps;
56 H264DSPContext h264dsp;
57 H264POCContext poc;
58 H264SEIContext sei;
59 int is_avc;
60 int nal_length_size;
61 int got_first;
62 int picture_structure;
63 uint8_t parse_history[6];
64 int parse_history_count;
65 int parse_last_mb;
66 int64_t reference_dts;
67 int last_frame_num, last_picture_structure;
68 } H264ParseContext;
69
70 39545 static int find_start_code(const uint8_t *buf, int buf_size,
71 int buf_index, int next_avc)
72 {
73 39545 uint32_t state = -1;
74
75 39545 buf_index = avpriv_find_start_code(buf + buf_index, buf + next_avc + 1, &state) - buf - 1;
76
77 39545 return FFMIN(buf_index, buf_size);
78 }
79
80 186421 static int h264_find_frame_end(H264ParseContext *p, const uint8_t *buf,
81 int buf_size, void *logctx)
82 {
83 int i, j;
84 uint32_t state;
85 186421 ParseContext *pc = &p->pc;
86
87
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 186421 int next_avc = p->is_avc ? 0 : buf_size;
88 // mb_addr= pc->mb_addr - 1;
89 186421 state = pc->state;
90
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 186421 if (state > 13)
91 96 state = 7;
92
93
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 186421 if (p->is_avc && !p->nal_length_size)
94 ✗ av_log(logctx, AV_LOG_ERROR, "AVC-parser: nal length size invalid\n");
95
96
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 2733344 for (i = 0; i < buf_size; i++) {
97
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 2573550 if (i >= next_avc) {
98 ✗ int64_t nalsize = 0;
99 ✗ i = next_avc;
100 ✗ for (j = 0; j < p->nal_length_size; j++)
101 ✗ nalsize = (nalsize << 8) | buf[i++];
102 ✗ if (!nalsize || nalsize > buf_size - i) {
103 ✗ av_log(logctx, AV_LOG_ERROR, "AVC-parser: nal size %"PRId64" "
104 "remaining %d\n", nalsize, buf_size - i);
105 ✗ return buf_size;
106 }
107 ✗ next_avc = i + nalsize;
108 ✗ state = 5;
109 }
110
111
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 2573550 if (state == 7) {
112 1208136 i += p->h264dsp.startcode_find_candidate(buf + i, next_avc - i);
113
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 1208136 if (i < next_avc)
114 1051133 state = 2;
115
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 1365414 } else if (state <= 2) {
116
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 1224996 if (buf[i] == 1)
117 100169 state ^= 5; // 2->7, 1->4, 0->5
118
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 1124827 else if (buf[i])
119 951218 state = 7;
120 else
121 173609 state >>= 1; // 2->1, 1->0, 0->0
122
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 140418 } else if (state <= 5) {
123 75214 int nalu_type = buf[i] & 0x1F;
124
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 75214 if (nalu_type == H264_NAL_SEI || nalu_type == H264_NAL_SPS ||
125
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 58645 nalu_type == H264_NAL_PPS || nalu_type == H264_NAL_AUD) {
126
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 21189 if (pc->frame_start_found) {
127 8780 i++;
128 8780 goto found;
129 }
130
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 54025 } else if (nalu_type == H264_NAL_SLICE || nalu_type == H264_NAL_DPA ||
131 nalu_type == H264_NAL_IDR_SLICE) {
132 53491 state += 8;
133 53491 continue;
134 }
135 12943 state = 7;
136 } else {
137 65204 unsigned int mb, last_mb = p->parse_last_mb;
138 GetBitContext gb;
139 65204 p->parse_history[p->parse_history_count++] = buf[i];
140
141 65204 init_get_bits(&gb, p->parse_history, 8*p->parse_history_count);
142 65204 mb= get_ue_golomb_long(&gb);
143
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 65204 if (get_bits_left(&gb) > 0 || p->parse_history_count > 5) {
144 53491 p->parse_last_mb = mb;
145
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 53491 if (pc->frame_start_found) {
146
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 26628 if (mb <= last_mb) {
147 17847 i -= p->parse_history_count - 1;
148 17847 p->parse_history_count = 0;
149 17847 goto found;
150 }
151 } else
152 26863 pc->frame_start_found = 1;
153 35644 p->parse_history_count = 0;
154 35644 state = 7;
155 }
156 }
157 }
158 159794 pc->state = state;
159
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 159794 if (p->is_avc)
160 ✗ return next_avc;
161 159794 return END_NOT_FOUND;
162
163 26627 found:
164 26627 pc->state = 7;
165 26627 pc->frame_start_found = 0;
166
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 26627 if (p->is_avc)
167 ✗ return next_avc;
168 26627 return i - (state & 5);
169 }
170
171 20679 static int scan_mmco_reset(AVCodecParserContext *s, GetBitContext *gb,
172 void *logctx)
173 {
174 H264PredWeightTable pwt;
175 20679 int slice_type_nos = s->pict_type & 3;
176 20679 H264ParseContext *p = s->priv_data;
177 int list_count, ref_count[2];
178
179
180
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 20679 if (p->ps.pps->redundant_pic_cnt_present)
181 ✗ get_ue_golomb(gb); // redundant_pic_count
182
183
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 20679 if (slice_type_nos == AV_PICTURE_TYPE_B)
184 1136 get_bits1(gb); // direct_spatial_mv_pred
185
186
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 20679 if (ff_h264_parse_ref_count(&list_count, ref_count, gb, p->ps.pps,
187 slice_type_nos, p->picture_structure, logctx) < 0)
188 ✗ return AVERROR_INVALIDDATA;
189
190
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 20679 if (slice_type_nos != AV_PICTURE_TYPE_I) {
191 int list;
192
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 38840 for (list = 0; list < list_count; list++) {
193
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 19988 if (get_bits1(gb)) {
194 int index;
195 15118 for (index = 0; ; index++) {
196 15118 unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(gb);
197
198
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 15118 if (reordering_of_pic_nums_idc < 3)
199 11967 get_ue_golomb_long(gb);
200
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 3151 else if (reordering_of_pic_nums_idc > 3) {
201 ✗ av_log(logctx, AV_LOG_ERROR,
202 "illegal reordering_of_pic_nums_idc %d\n",
203 reordering_of_pic_nums_idc);
204 ✗ return AVERROR_INVALIDDATA;
205 } else
206 3151 break;
207
208
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 11967 if (index >= ref_count[list]) {
209 ✗ av_log(logctx, AV_LOG_ERROR,
210 "reference count %d overflow\n", index);
211 ✗ return AVERROR_INVALIDDATA;
212 }
213 }
214 }
215 }
216 }
217
218
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 20679 if ((p->ps.pps->weighted_pred && slice_type_nos == AV_PICTURE_TYPE_P) ||
219
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 17237 (p->ps.pps->weighted_bipred_idc == 1 && slice_type_nos == AV_PICTURE_TYPE_B))
220 3466 ff_h264_pred_weight_table(gb, p->ps.sps, ref_count, slice_type_nos,
221 &pwt, p->picture_structure, logctx);
222
223
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 20679 if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
224 int i;
225
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 6227 for (i = 0; i < H264_MAX_MMCO_COUNT; i++) {
226 6227 MMCOOpcode opcode = get_ue_golomb_31(gb);
227
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 6227 if (opcode > (unsigned) MMCO_LONG) {
228 ✗ av_log(logctx, AV_LOG_ERROR,
229 "illegal memory management control operation %d\n",
230 opcode);
231 ✗ return AVERROR_INVALIDDATA;
232 }
233
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 6227 if (opcode == MMCO_END)
234 2100 return 0;
235
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 4127 else if (opcode == MMCO_RESET)
236 50 return 1;
237
238
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 4077 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
239 3602 get_ue_golomb_long(gb); // difference_of_pic_nums_minus1
240
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 4077 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
241
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 3648 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
242 808 get_ue_golomb_31(gb);
243 }
244 }
245
246 18529 return 0;
247 }
248
249 /**
250 * Parse NAL units of found picture and decode some basic information.
251 *
252 * @param s parser context.
253 * @param avctx codec context.
254 * @param buf buffer with field/frame data.
255 * @param buf_size size of the buffer.
256 */
257 34098 static inline int parse_nal_units(AVCodecParserContext *s,
258 AVCodecContext *avctx,
259 const uint8_t * const buf, int buf_size)
260 {
261 34098 H264ParseContext *p = s->priv_data;
262 34098 H2645RBSP rbsp = { NULL };
263 34098 H2645NAL nal = { NULL };
264 int buf_index, next_avc;
265 unsigned int pps_id;
266 unsigned int slice_type;
267 34098 int state = -1, got_reset = 0;
268
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 34098 int q264 = buf_size >=4 && !memcmp("Q264", buf, 4);
269 int field_poc[2];
270 int ret;
271
272 /* set some sane default values */
273 34098 s->pict_type = AV_PICTURE_TYPE_I;
274 34098 s->key_frame = 0;
275 34098 s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
276
277 34098 ff_h264_sei_uninit(&p->sei);
278 34098 p->sei.common.frame_packing.arrangement_cancel_flag = -1;
279 34098 p->sei.common.unregistered.x264_build = -1;
280
281
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 34098 if (!buf_size)
282 331 return 0;
283
284 33767 av_fast_padded_malloc(&rbsp.rbsp_buffer, &rbsp.rbsp_buffer_alloc_size, buf_size);
285
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 33767 if (!rbsp.rbsp_buffer)
286 ✗ return AVERROR(ENOMEM);
287
288 33767 buf_index = 0;
289
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 33767 next_avc = p->is_avc ? 0 : buf_size;
290 16668 for (;;) {
291 const SPS *sps;
292 50435 int src_length, consumed, nalsize = 0;
293
294
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 50435 if (buf_index >= next_avc) {
295 10890 nalsize = get_nalsize(p->nal_length_size, buf, buf_size, &buf_index, avctx);
296
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 10890 if (nalsize < 0)
297 332 break;
298 10558 next_avc = buf_index + nalsize;
299 } else {
300 39545 buf_index = find_start_code(buf, buf_size, buf_index, next_avc);
301
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 39545 if (buf_index >= buf_size)
302 ✗ break;
303
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 39545 if (buf_index >= next_avc)
304 ✗ continue;
305 }
306 50103 src_length = next_avc - buf_index;
307
308 50103 state = buf[buf_index];
309
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 50103 switch (state & 0x1f) {
310 33435 case H264_NAL_SLICE:
311 case H264_NAL_IDR_SLICE:
312 // Do not walk the whole buffer just to decode slice header
313
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 33435 if ((state & 0x1f) == H264_NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
314 /* IDR or disposable slice
315 * No need to decode many bytes because MMCOs shall not be present. */
316
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 12214 if (src_length > 60)
317 11810 src_length = 60;
318 } else {
319 /* To decode up to MMCOs */
320
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 21221 if (src_length > 1000)
321 11913 src_length = 1000;
322 }
323 33435 break;
324 }
325 50103 consumed = ff_h2645_extract_rbsp(buf + buf_index, src_length, &rbsp, &nal, 1);
326
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 50103 if (consumed < 0)
327 ✗ break;
328
329 50103 buf_index += consumed;
330
331 50103 ret = init_get_bits8(&nal.gb, nal.data, nal.size);
332
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 50103 if (ret < 0)
333 ✗ goto fail;
334 50103 get_bits1(&nal.gb);
335 50103 nal.ref_idc = get_bits(&nal.gb, 2);
336 50103 nal.type = get_bits(&nal.gb, 5);
337
338
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 50103 switch (nal.type) {
339 932 case H264_NAL_SPS:
340 932 ff_h264_decode_seq_parameter_set(&nal.gb, avctx, &p->ps, 0);
341 932 break;
342 7635 case H264_NAL_PPS:
343 7635 ff_h264_decode_picture_parameter_set(&nal.gb, avctx, &p->ps,
344 nal.size_bits);
345 7635 break;
346 4226 case H264_NAL_SEI:
347 4226 ff_h264_sei_decode(&p->sei, &nal.gb, &p->ps, avctx);
348 4226 break;
349 864 case H264_NAL_IDR_SLICE:
350 864 s->key_frame = 1;
351
352 864 p->poc.prev_frame_num = 0;
353 864 p->poc.prev_frame_num_offset = 0;
354 864 p->poc.prev_poc_msb =
355 864 p->poc.prev_poc_lsb = 0;
356 /* fall through */
357 33435 case H264_NAL_SLICE:
358 33435 get_ue_golomb_long(&nal.gb); // skip first_mb_in_slice
359 33435 slice_type = get_ue_golomb_31(&nal.gb);
360 33435 s->pict_type = ff_h264_golomb_to_pict_type[slice_type % 5];
361
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 33435 if (p->sei.recovery_point.recovery_frame_cnt >= 0) {
362 /* key frame, since recovery_frame_cnt is set */
363 205 s->key_frame = 1;
364 }
365 33435 pps_id = get_ue_golomb(&nal.gb);
366
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 33435 if (pps_id >= MAX_PPS_COUNT) {
367 ✗ av_log(avctx, AV_LOG_ERROR,
368 "pps_id %u out of range\n", pps_id);
369 ✗ goto fail;
370 }
371
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 33435 if (!p->ps.pps_list[pps_id]) {
372 568 av_log(avctx, AV_LOG_ERROR,
373 "non-existing PPS %u referenced\n", pps_id);
374 568 goto fail;
375 }
376
377 32867 av_refstruct_replace(&p->ps.pps, p->ps.pps_list[pps_id]);
378 32867 p->ps.sps = p->ps.pps->sps;
379 32867 sps = p->ps.sps;
380
381 // heuristic to detect non marked keyframes
382
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 32867 if (p->ps.sps->ref_frame_count <= 1 && p->ps.pps->ref_count[0] <= 1 && s->pict_type == AV_PICTURE_TYPE_I)
383 1029 s->key_frame = 1;
384
385 32867 p->poc.frame_num = get_bits(&nal.gb, sps->log2_max_frame_num);
386
387 32867 s->coded_width = 16 * sps->mb_width;
388 32867 s->coded_height = 16 * sps->mb_height;
389 32867 s->width = s->coded_width - (sps->crop_right + sps->crop_left);
390 32867 s->height = s->coded_height - (sps->crop_top + sps->crop_bottom);
391
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 32867 if (s->width <= 0 || s->height <= 0) {
392 ✗ s->width = s->coded_width;
393 ✗ s->height = s->coded_height;
394 }
395
396
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 32867 switch (sps->bit_depth_luma) {
397 150 case 9:
398
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 150 if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P9;
399
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 150 else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P9;
400 100 else s->format = AV_PIX_FMT_YUV420P9;
401 150 break;
402 285 case 10:
403
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 285 if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P10;
404
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 235 else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P10;
405 148 else s->format = AV_PIX_FMT_YUV420P10;
406 285 break;
407 32432 case 8:
408
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 32432 if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P;
409
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 31539 else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P;
410 31529 else s->format = AV_PIX_FMT_YUV420P;
411 32432 break;
412 ✗ default:
413 ✗ s->format = AV_PIX_FMT_NONE;
414 }
415
416 32867 avctx->profile = ff_h264_get_profile(sps);
417 32867 avctx->level = sps->level_idc;
418
419
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 32867 if (sps->frame_mbs_only_flag) {
420 23419 p->picture_structure = PICT_FRAME;
421 } else {
422
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 9448 if (get_bits1(&nal.gb)) { // field_pic_flag
423 6487 p->picture_structure = PICT_TOP_FIELD + get_bits1(&nal.gb); // bottom_field_flag
424 } else {
425 2961 p->picture_structure = PICT_FRAME;
426 }
427 }
428
429
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 32867 if (nal.type == H264_NAL_IDR_SLICE)
430 862 get_ue_golomb_long(&nal.gb); /* idr_pic_id */
431
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 32867 if (sps->poc_type == 0) {
432 24923 p->poc.poc_lsb = get_bits(&nal.gb, sps->log2_max_poc_lsb);
433
434
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 24923 if (p->ps.pps->pic_order_present == 1 &&
435
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 4228 p->picture_structure == PICT_FRAME)
436 3273 p->poc.delta_poc_bottom = get_se_golomb(&nal.gb);
437 }
438
439
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 32867 if (sps->poc_type == 1 &&
440
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 3245 !sps->delta_pic_order_always_zero_flag) {
441 3071 p->poc.delta_poc[0] = get_se_golomb(&nal.gb);
442
443
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 3071 if (p->ps.pps->pic_order_present == 1 &&
444
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 692 p->picture_structure == PICT_FRAME)
445 406 p->poc.delta_poc[1] = get_se_golomb(&nal.gb);
446 }
447
448 /* Decode POC of this picture.
449 * The prev_ values needed for decoding POC of the next picture are not set here. */
450 32867 field_poc[0] = field_poc[1] = INT_MAX;
451 32867 ret = ff_h264_init_poc(field_poc, &s->output_picture_number, sps,
452 &p->poc, p->picture_structure, nal.ref_idc);
453
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 32867 if (ret < 0)
454 ✗ goto fail;
455
456 /* Continue parsing to check if MMCO_RESET is present.
457 * FIXME: MMCO_RESET could appear in non-first slice.
458 * Maybe, we should parse all undisposable non-IDR slice of this
459 * picture until encountering MMCO_RESET in a slice of it. */
460
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 32867 if (nal.ref_idc && nal.type != H264_NAL_IDR_SLICE) {
461 20679 got_reset = scan_mmco_reset(s, &nal.gb, avctx);
462
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 20679 if (got_reset < 0)
463 ✗ goto fail;
464 }
465
466 /* Set up the prev_ values for decoding POC of the next picture. */
467
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 32867 p->poc.prev_frame_num = got_reset ? 0 : p->poc.frame_num;
468
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 32867 p->poc.prev_frame_num_offset = got_reset ? 0 : p->poc.frame_num_offset;
469
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 32867 if (nal.ref_idc != 0) {
470
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 21541 if (!got_reset) {
471 21491 p->poc.prev_poc_msb = p->poc.poc_msb;
472 21491 p->poc.prev_poc_lsb = p->poc.poc_lsb;
473 } else {
474 50 p->poc.prev_poc_msb = 0;
475 50 p->poc.prev_poc_lsb =
476
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 50 p->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
477 }
478 }
479
480
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 32867 if (p->sei.picture_timing.present) {
481 2989 ret = ff_h264_sei_process_picture_timing(&p->sei.picture_timing,
482 sps, avctx);
483
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 2989 if (ret < 0) {
484 ✗ av_log(avctx, AV_LOG_ERROR, "Error processing the picture timing SEI\n");
485 ✗ p->sei.picture_timing.present = 0;
486 }
487 }
488
489
4/4
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 32867 if (sps->pic_struct_present_flag && p->sei.picture_timing.present) {
490
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 2977 switch (p->sei.picture_timing.pic_struct) {
491 831 case H264_SEI_PIC_STRUCT_TOP_FIELD:
492 case H264_SEI_PIC_STRUCT_BOTTOM_FIELD:
493 831 s->repeat_pict = 0;
494 831 break;
495 2008 case H264_SEI_PIC_STRUCT_FRAME:
496 case H264_SEI_PIC_STRUCT_TOP_BOTTOM:
497 case H264_SEI_PIC_STRUCT_BOTTOM_TOP:
498 2008 s->repeat_pict = 1;
499 2008 break;
500 138 case H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
501 case H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
502 138 s->repeat_pict = 2;
503 138 break;
504 ✗ case H264_SEI_PIC_STRUCT_FRAME_DOUBLING:
505 ✗ s->repeat_pict = 3;
506 ✗ break;
507 ✗ case H264_SEI_PIC_STRUCT_FRAME_TRIPLING:
508 ✗ s->repeat_pict = 5;
509 ✗ break;
510 ✗ default:
511 ✗ s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
512 ✗ break;
513 }
514 } else {
515 29890 s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
516 }
517
518
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 32867 if (p->picture_structure == PICT_FRAME) {
519 26380 s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
520
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 26380 if (sps->pic_struct_present_flag && p->sei.picture_timing.present) {
521
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 2146 switch (p->sei.picture_timing.pic_struct) {
522 1421 case H264_SEI_PIC_STRUCT_TOP_BOTTOM:
523 case H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
524 1421 s->field_order = AV_FIELD_TT;
525 1421 break;
526 150 case H264_SEI_PIC_STRUCT_BOTTOM_TOP:
527 case H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
528 150 s->field_order = AV_FIELD_BB;
529 150 break;
530 575 default:
531 575 s->field_order = AV_FIELD_PROGRESSIVE;
532 575 break;
533 }
534 } else {
535
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 24234 if (field_poc[0] < field_poc[1])
536 1041 s->field_order = AV_FIELD_TT;
537
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 23193 else if (field_poc[0] > field_poc[1])
538 3 s->field_order = AV_FIELD_BB;
539 else
540 23190 s->field_order = AV_FIELD_PROGRESSIVE;
541 }
542 } else {
543
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 6487 if (p->picture_structure == PICT_TOP_FIELD)
544 3341 s->picture_structure = AV_PICTURE_STRUCTURE_TOP_FIELD;
545 else
546 3146 s->picture_structure = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
547
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 6487 if (p->poc.frame_num == p->last_frame_num &&
548
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 4884 p->last_picture_structure != AV_PICTURE_STRUCTURE_UNKNOWN &&
549
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 4884 p->last_picture_structure != AV_PICTURE_STRUCTURE_FRAME &&
550
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 4884 p->last_picture_structure != s->picture_structure) {
551
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 4760 if (p->last_picture_structure == AV_PICTURE_STRUCTURE_TOP_FIELD)
552 3140 s->field_order = AV_FIELD_TT;
553 else
554 1620 s->field_order = AV_FIELD_BB;
555 } else {
556 1727 s->field_order = AV_FIELD_UNKNOWN;
557 }
558 6487 p->last_picture_structure = s->picture_structure;
559 6487 p->last_frame_num = p->poc.frame_num;
560 }
561
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 32867 if (sps->timing_info_present_flag) {
562 9769 int64_t den = sps->time_scale;
563
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 9769 if (p->sei.common.unregistered.x264_build < 44U)
564 ✗ den *= 2;
565 9769 av_reduce(&avctx->framerate.den, &avctx->framerate.num,
566 9769 sps->num_units_in_tick * 2, den, 1 << 30);
567 }
568
569 32867 av_freep(&rbsp.rbsp_buffer);
570 32867 return 0; /* no need to evaluate the rest */
571 }
572 }
573
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 332 if (q264) {
574 ✗ av_freep(&rbsp.rbsp_buffer);
575 ✗ return 0;
576 }
577 /* didn't find a picture! */
578 332 av_log(avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
579 900 fail:
580 900 av_freep(&rbsp.rbsp_buffer);
581 900 return -1;
582 }
583
584 193304 static int h264_parse(AVCodecParserContext *s,
585 AVCodecContext *avctx,
586 const uint8_t **poutbuf, int *poutbuf_size,
587 const uint8_t *buf, int buf_size)
588 {
589 193304 H264ParseContext *p = s->priv_data;
590 193304 ParseContext *pc = &p->pc;
591 193304 AVRational time_base = { 0, 1 };
592 int next;
593
594
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 193304 if (!p->got_first) {
595 446 p->got_first = 1;
596
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 446 if (avctx->extradata_size) {
597 214 ff_h264_decode_extradata(avctx->extradata, avctx->extradata_size,
598 &p->ps, &p->is_avc, &p->nal_length_size,
599 avctx->err_recognition, avctx);
600 }
601 }
602
603
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 193304 if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
604 7003 next = buf_size;
605 } else {
606 186301 next = h264_find_frame_end(p, buf, buf_size, avctx);
607
608
2/2
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 186301 if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
609 159206 *poutbuf = NULL;
610 159206 *poutbuf_size = 0;
611 159206 return buf_size;
612 }
613
614
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 27095 if (next < 0 && next != END_NOT_FOUND) {
615 av_assert1(pc->last_index + next >= 0);
616 120 h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next, avctx); // update state
617 }
618 }
619
620 34098 parse_nal_units(s, avctx, buf, buf_size);
621
622
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 34098 if (avctx->framerate.num)
623 10207 time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){2, 1}));
624
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 34098 if (p->sei.picture_timing.cpb_removal_delay >= 0) {
625 1957 s->dts_sync_point = p->sei.buffering_period.present;
626 1957 s->dts_ref_dts_delta = p->sei.picture_timing.cpb_removal_delay;
627 1957 s->pts_dts_delta = p->sei.picture_timing.dpb_output_delay;
628 } else {
629 32141 s->dts_sync_point = INT_MIN;
630 32141 s->dts_ref_dts_delta = INT_MIN;
631 32141 s->pts_dts_delta = INT_MIN;
632 }
633
634
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 34098 if (s->flags & PARSER_FLAG_ONCE) {
635 ✗ s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
636 }
637
638
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 34098 if (s->dts_sync_point >= 0) {
639 1957 int64_t den = time_base.den * (int64_t)avctx->pkt_timebase.num;
640
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 1957 if (den > 0) {
641 1957 int64_t num = time_base.num * (int64_t)avctx->pkt_timebase.den;
642
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 1957 if (s->dts != AV_NOPTS_VALUE) {
643 // got DTS from the stream, update reference timestamp
644 1555 p->reference_dts = av_sat_sub64(s->dts, av_rescale(s->dts_ref_dts_delta, num, den));
645
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 402 } else if (p->reference_dts != AV_NOPTS_VALUE) {
646 // compute DTS based on reference timestamp
647 ✗ s->dts = av_sat_add64(p->reference_dts, av_rescale(s->dts_ref_dts_delta, num, den));
648 }
649
650
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 1957 if (p->reference_dts != AV_NOPTS_VALUE && s->pts == AV_NOPTS_VALUE)
651 ✗ s->pts = s->dts + av_rescale(s->pts_dts_delta, num, den);
652
653
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 1957 if (s->dts_sync_point > 0)
654 135 p->reference_dts = s->dts; // new reference
655 }
656 }
657
658 34098 *poutbuf = buf;
659 34098 *poutbuf_size = buf_size;
660 34098 return next;
661 }
662
663 449 static void h264_close(AVCodecParserContext *s)
664 {
665 449 H264ParseContext *p = s->priv_data;
666 449 ParseContext *pc = &p->pc;
667
668 449 av_freep(&pc->buffer);
669
670 449 ff_h264_sei_uninit(&p->sei);
671 449 ff_h264_ps_uninit(&p->ps);
672 449 }
673
674 449 static av_cold int init(AVCodecParserContext *s)
675 {
676 449 H264ParseContext *p = s->priv_data;
677
678 449 p->reference_dts = AV_NOPTS_VALUE;
679 449 p->last_frame_num = INT_MAX;
680 449 ff_h264dsp_init(&p->h264dsp, 8, 1);
681 449 return 0;
682 }
683
684 const AVCodecParser ff_h264_parser = {
685 .codec_ids = { AV_CODEC_ID_H264 },
686 .priv_data_size = sizeof(H264ParseContext),
687 .parser_init = init,
688 .parser_parse = h264_parse,
689 .parser_close = h264_close,
690 };
691