FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/h264_parser.c
Date: 2026-09-14 12:48:48
Exec Total Coverage
Lines: 340 394 86.3%
Functions: 7 7 100.0%
Branches: 247 297 83.2%
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 40734 static int find_start_code(const uint8_t *buf, int buf_size,
73 int buf_index, int next_avc)
74 {
75 40734 uint32_t state = -1;
76
77 40734 buf_index = avpriv_find_start_code(buf + buf_index, buf + next_avc + 1, &state) - buf - 1;
78
79 40734 return FFMIN(buf_index, buf_size);
80 }
81
82 188674 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 188674 ParseContext *pc = &p->pc;
88
89
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 188674 int next_avc = p->is_avc ? 0 : buf_size;
90 // mb_addr= pc->mb_addr - 1;
91 188674 state = pc->state;
92
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 188674 if (state > 13)
93 99 state = 7;
94
95
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 188674 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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 2774806 for (i = 0; i < buf_size; i++) {
99
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 2613504 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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 2613504 if (state == 7) {
114 1224273 i += p->h264dsp.startcode_find_candidate(buf + i, next_avc - i);
115
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 1224273 if (i < next_avc)
116 1065822 state = 2;
117
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 1389231 } else if (state <= 2) {
118
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 1244801 if (buf[i] == 1)
119 102765 state ^= 5; // 2->7, 1->4, 0->5
120
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 1142036 else if (buf[i])
121 963326 state = 7;
122 else
123 178710 state >>= 1; // 2->1, 1->0, 0->0
124
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 144430 } else if (state <= 5) {
125 77415 int nalu_type = buf[i] & 0x1F;
126
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 77415 if (nalu_type == H264_NAL_SEI || nalu_type == H264_NAL_SPS ||
127
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 60542 nalu_type == H264_NAL_PPS || nalu_type == H264_NAL_AUD) {
128
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 21856 if (pc->frame_start_found) {
129 9018 i++;
130 9018 goto found;
131 }
132
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 55559 } else if (nalu_type == H264_NAL_SLICE || nalu_type == H264_NAL_DPA ||
133 nalu_type == H264_NAL_IDR_SLICE) {
134 54962 state += 8;
135 54962 continue;
136 }
137 13435 state = 7;
138 } else {
139 67015 unsigned int mb, last_mb = p->parse_last_mb;
140 GetBitContext gb;
141 67015 p->parse_history[p->parse_history_count++] = buf[i];
142
143 67015 init_get_bits(&gb, p->parse_history, 8*p->parse_history_count);
144 67015 mb= get_ue_golomb_long(&gb);
145
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 67015 if (get_bits_left(&gb) > 0 || p->parse_history_count > 5) {
146 54962 p->parse_last_mb = mb;
147
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 54962 if (pc->frame_start_found) {
148
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 27339 if (mb <= last_mb) {
149 18354 i -= p->parse_history_count - 1;
150 18354 p->parse_history_count = 0;
151 18354 goto found;
152 }
153 } else
154 27623 pc->frame_start_found = 1;
155 36608 p->parse_history_count = 0;
156 36608 state = 7;
157 }
158 }
159 }
160 161302 pc->state = state;
161
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 161302 if (p->is_avc)
162 ✗ return next_avc;
163 161302 return END_NOT_FOUND;
164
165 27372 found:
166 27372 pc->state = 7;
167 27372 pc->frame_start_found = 0;
168
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 27372 if (p->is_avc)
169 ✗ return next_avc;
170 27372 return i - (state & 5);
171 }
172
173 21269 static int scan_mmco_reset(AVCodecParserContext *s, GetBitContext *gb,
174 void *logctx)
175 {
176 H264PredWeightTable pwt;
177 21269 int slice_type_nos = s->pict_type & 3;
178 21269 H264ParseContext *p = s->priv_data;
179 int list_count, ref_count[2];
180
181
182
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 21269 if (p->ps.pps->redundant_pic_cnt_present)
183 ✗ get_ue_golomb(gb); // redundant_pic_count
184
185
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 21269 if (slice_type_nos == AV_PICTURE_TYPE_B)
186 1191 get_bits1(gb); // direct_spatial_mv_pred
187
188
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 21269 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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 21269 if (slice_type_nos != AV_PICTURE_TYPE_I) {
193 int list;
194
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 40045 for (list = 0; list < list_count; list++) {
195
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 20618 if (get_bits1(gb)) {
196 int index;
197 15509 for (index = 0; ; index++) {
198 15509 unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(gb);
199
200
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 15509 if (reordering_of_pic_nums_idc < 3)
201 12288 get_ue_golomb_long(gb);
202
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 3221 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 3221 break;
209
210
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 12288 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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 21269 if ((p->ps.pps->weighted_pred && slice_type_nos == AV_PICTURE_TYPE_P) ||
221
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 17450 (p->ps.pps->weighted_bipred_idc == 1 && slice_type_nos == AV_PICTURE_TYPE_B))
222 3843 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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 21269 if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
226 int i;
227
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 6386 for (i = 0; i < H264_MAX_MMCO_COUNT; i++) {
228
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 6386 if (get_bits_left(gb) < 1)
229 ✗ return AVERROR_INVALIDDATA;
230
231 6386 MMCOOpcode opcode = get_ue_golomb_31(gb);
232
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 6386 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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 6386 if (opcode == MMCO_END)
239 2165 return 0;
240
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 4221 else if (opcode == MMCO_RESET)
241 50 return 1;
242
243
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 4171 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
244 3696 get_ue_golomb_long(gb); // difference_of_pic_nums_minus1
245
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 4171 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
246
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 3742 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
247 808 get_ue_golomb_31(gb);
248 }
249 }
250
251 19054 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 35264 static inline int parse_nal_units(AVCodecParserContext *s,
263 AVCodecContext *avctx,
264 const uint8_t * const buf, int buf_size)
265 {
266 35264 H264ParseContext *p = s->priv_data;
267 35264 H2645RBSP rbsp = { NULL };
268 35264 H2645NAL nal = { NULL };
269 int buf_index, next_avc;
270 unsigned int pps_id;
271 unsigned int slice_type;
272 35264 int state = -1, got_reset = 0;
273
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 35264 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 35264 s->pict_type = AV_PICTURE_TYPE_I;
279 35264 s->key_frame = 0;
280 35264 s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
281
282 35264 ff_h264_sei_uninit(&p->sei);
283 35264 p->sei.common.frame_packing.arrangement_cancel_flag = -1;
284 35264 p->sei.common.unregistered.x264_build = -1;
285
286
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 35264 if (!buf_size)
287 361 return 0;
288
289 34903 av_fast_padded_malloc(&rbsp.rbsp_buffer, &rbsp.rbsp_buffer_alloc_size, buf_size);
290
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 34903 if (!rbsp.rbsp_buffer)
291 ✗ return AVERROR(ENOMEM);
292
293 34903 buf_index = 0;
294
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 34903 next_avc = p->is_avc ? 0 : buf_size;
295 17263 for (;;) {
296 const SPS *sps;
297 52166 int src_length, consumed, nalsize = 0;
298
299
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 52166 if (buf_index >= next_avc) {
300 11432 nalsize = get_nalsize(p->nal_length_size, buf, buf_size, &buf_index, avctx);
301
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 11432 if (nalsize < 0)
302 332 break;
303 11100 next_avc = buf_index + nalsize;
304 } else {
305 40734 buf_index = find_start_code(buf, buf_size, buf_index, next_avc);
306
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 40734 if (buf_index >= buf_size)
307 ✗ break;
308
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 40734 if (buf_index >= next_avc)
309 ✗ continue;
310 }
311 51834 src_length = next_avc - buf_index;
312
313 51834 state = buf[buf_index];
314
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 51834 switch (state & 0x1f) {
315 34571 case H264_NAL_SLICE:
316 case H264_NAL_IDR_SLICE:
317 case H264_NAL_DPA:
318 // Do not walk the whole buffer just to decode slice header
319
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 34571 if ((state & 0x1f) == H264_NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
320 /* IDR or disposable slice
321 * No need to decode many bytes because MMCOs shall not be present. */
322
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 12760 if (src_length > 60)
323 12225 src_length = 60;
324 } else {
325 /* To decode up to MMCOs */
326
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 21811 if (src_length > 1000)
327 12262 src_length = 1000;
328 }
329 34571 break;
330 }
331 51834 consumed = ff_h2645_extract_rbsp(buf + buf_index, src_length, &rbsp, &nal, 1);
332
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 51834 if (consumed < 0)
333 ✗ break;
334
335 51834 buf_index += consumed;
336
337 51834 ret = init_get_bits8(&nal.gb, nal.data, nal.size);
338
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 51834 if (ret < 0)
339 ✗ goto fail;
340 51834 get_bits1(&nal.gb);
341 51834 nal.ref_idc = get_bits(&nal.gb, 2);
342 51834 nal.type = get_bits(&nal.gb, 5);
343
344
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 51834 switch (nal.type) {
345 963 case H264_NAL_SPS:
346 963 ff_h264_decode_seq_parameter_set(&nal.gb, avctx, &p->ps, 0);
347 963 break;
348 7731 case H264_NAL_PPS:
349 7731 ff_h264_decode_picture_parameter_set(&nal.gb, avctx, &p->ps,
350 nal.size_bits);
351 7731 break;
352 4509 case H264_NAL_SEI:
353 4509 ff_h264_sei_decode(&p->sei, &nal.gb, &p->ps, avctx);
354 4509 break;
355 961 case H264_NAL_IDR_SLICE:
356 961 s->key_frame = 1;
357
358 961 p->poc.prev_frame_num = 0;
359 961 p->poc.prev_frame_num_offset = 0;
360 961 p->poc.prev_poc_msb =
361 961 p->poc.prev_poc_lsb = 0;
362 av_fallthrough;
363 34571 case H264_NAL_SLICE:
364 case H264_NAL_DPA: // starts with a slice header too
365 34571 get_ue_golomb_long(&nal.gb); // skip first_mb_in_slice
366 34571 slice_type = get_ue_golomb_31(&nal.gb);
367 34571 s->pict_type = ff_h264_golomb_to_pict_type[slice_type % 5];
368
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 34571 if (p->sei.recovery_point.recovery_frame_cnt >= 0) {
369 /* key frame, since recovery_frame_cnt is set */
370 213 s->key_frame = 1;
371 }
372 34571 pps_id = get_ue_golomb(&nal.gb);
373
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 34571 if (pps_id >= MAX_PPS_COUNT) {
374 ✗ av_log(avctx, AV_LOG_ERROR,
375 "pps_id %u out of range\n", pps_id);
376 ✗ goto fail;
377 }
378
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 34571 if (!p->ps.pps_list[pps_id]) {
379 568 av_log(avctx, AV_LOG_ERROR,
380 "non-existing PPS %u referenced\n", pps_id);
381 568 goto fail;
382 }
383
384 34003 av_refstruct_replace(&p->ps.pps, p->ps.pps_list[pps_id]);
385 34003 p->ps.sps = p->ps.pps->sps;
386 34003 sps = p->ps.sps;
387
388 // heuristic to detect non marked keyframes
389
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 34003 if (p->ps.sps->ref_frame_count <= 1 && p->ps.pps->ref_count[0] <= 1 && s->pict_type == AV_PICTURE_TYPE_I)
390 1101 s->key_frame = 1;
391
392 34003 p->poc.frame_num = get_bits(&nal.gb, sps->log2_max_frame_num);
393
394 34003 s->coded_width = 16 * sps->mb_width;
395 34003 s->coded_height = 16 * sps->mb_height;
396 34003 s->width = s->coded_width - (sps->crop_right + sps->crop_left);
397 34003 s->height = s->coded_height - (sps->crop_top + sps->crop_bottom);
398
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 34003 if (s->width <= 0 || s->height <= 0) {
399 ✗ s->width = s->coded_width;
400 ✗ s->height = s->coded_height;
401 }
402
403
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 34003 switch (sps->bit_depth_luma) {
404 150 case 9:
405
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 150 if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P9;
406
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 150 else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P9;
407 100 else s->format = AV_PIX_FMT_YUV420P9;
408 150 break;
409 290 case 10:
410
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 290 if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P10;
411
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 240 else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P10;
412 153 else s->format = AV_PIX_FMT_YUV420P10;
413 290 break;
414 33563 case 8:
415
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 33563 if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P;
416
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 32674 else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P;
417 32664 else s->format = AV_PIX_FMT_YUV420P;
418 33563 break;
419 ✗ default:
420 ✗ s->format = AV_PIX_FMT_NONE;
421 }
422
423 34003 avctx->profile = ff_h264_get_profile(sps);
424 34003 avctx->level = sps->level_idc;
425
426
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 34003 if (sps->frame_mbs_only_flag) {
427 24487 p->picture_structure = PICT_FRAME;
428 24487 s->field_order = AV_FIELD_PROGRESSIVE;
429 } else {
430
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 9516 if (get_bits1(&nal.gb)) { // field_pic_flag
431 6521 p->picture_structure = PICT_TOP_FIELD + get_bits1(&nal.gb); // bottom_field_flag
432 } else {
433 2995 p->picture_structure = PICT_FRAME;
434 }
435 }
436
437
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 34003 if (nal.type == H264_NAL_IDR_SLICE)
438 959 get_ue_golomb_long(&nal.gb); /* idr_pic_id */
439
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 34003 if (sps->poc_type == 0) {
440 25905 p->poc.poc_lsb = get_bits(&nal.gb, sps->log2_max_poc_lsb);
441
442
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 25905 if (p->ps.pps->pic_order_present == 1 &&
443
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 4225 p->picture_structure == PICT_FRAME)
444 3270 p->poc.delta_poc_bottom = get_se_golomb(&nal.gb);
445 }
446
447
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 34003 if (sps->poc_type == 1 &&
448
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 3245 !sps->delta_pic_order_always_zero_flag) {
449 3071 p->poc.delta_poc[0] = get_se_golomb(&nal.gb);
450
451
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 3071 if (p->ps.pps->pic_order_present == 1 &&
452
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 692 p->picture_structure == PICT_FRAME)
453 406 p->poc.delta_poc[1] = get_se_golomb(&nal.gb);
454 }
455
456 /* Decode POC of this picture.
457 * The prev_ values needed for decoding POC of the next picture are not set here. */
458 34003 field_poc[0] = field_poc[1] = INT_MAX;
459 34003 ret = ff_h264_init_poc(field_poc, &s->output_picture_number, sps,
460 &p->poc, p->picture_structure, nal.ref_idc);
461
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 34003 if (ret < 0)
462 ✗ goto fail;
463
464 /* Continue parsing to check if MMCO_RESET is present.
465 * FIXME: MMCO_RESET could appear in non-first slice.
466 * Maybe, we should parse all undisposable non-IDR slice of this
467 * picture until encountering MMCO_RESET in a slice of it. */
468
4/4
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 34003 if (nal.ref_idc && nal.type != H264_NAL_IDR_SLICE) {
469 21269 got_reset = scan_mmco_reset(s, &nal.gb, avctx);
470
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 21269 if (got_reset < 0)
471 ✗ goto fail;
472 }
473
474 /* Set up the prev_ values for decoding POC of the next picture. */
475
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 34003 p->poc.prev_frame_num = got_reset ? 0 : p->poc.frame_num;
476
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 34003 p->poc.prev_frame_num_offset = got_reset ? 0 : p->poc.frame_num_offset;
477
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 34003 if (nal.ref_idc != 0) {
478
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 22228 if (!got_reset) {
479 22178 p->poc.prev_poc_msb = p->poc.poc_msb;
480 22178 p->poc.prev_poc_lsb = p->poc.poc_lsb;
481 } else {
482 50 p->poc.prev_poc_msb = 0;
483 50 p->poc.prev_poc_lsb =
484
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 50 p->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
485 }
486 }
487
488
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 34003 if (p->sei.picture_timing.present) {
489 3085 ret = ff_h264_sei_process_picture_timing(&p->sei.picture_timing,
490 sps, avctx);
491
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 3085 if (ret < 0) {
492 ✗ av_log(avctx, AV_LOG_ERROR, "Error processing the picture timing SEI\n");
493 ✗ p->sei.picture_timing.present = 0;
494 }
495 }
496
497
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 34003 if (sps->pic_struct_present_flag && p->sei.picture_timing.present) {
498
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 3073 switch (p->sei.picture_timing.pic_struct) {
499 831 case H264_SEI_PIC_STRUCT_TOP_FIELD:
500 case H264_SEI_PIC_STRUCT_BOTTOM_FIELD:
501 831 s->repeat_pict = 0;
502 831 break;
503 2104 case H264_SEI_PIC_STRUCT_FRAME:
504 case H264_SEI_PIC_STRUCT_TOP_BOTTOM:
505 case H264_SEI_PIC_STRUCT_BOTTOM_TOP:
506 2104 s->repeat_pict = 1;
507 2104 break;
508 138 case H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
509 case H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
510 138 s->repeat_pict = 2;
511 138 break;
512 ✗ case H264_SEI_PIC_STRUCT_FRAME_DOUBLING:
513 ✗ s->repeat_pict = 3;
514 ✗ break;
515 ✗ case H264_SEI_PIC_STRUCT_FRAME_TRIPLING:
516 ✗ s->repeat_pict = 5;
517 ✗ break;
518 ✗ default:
519 ✗ s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
520 ✗ break;
521 }
522 } else {
523 30930 s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
524 }
525
526
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 34003 if (p->picture_structure == PICT_FRAME) {
527 27482 s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
528
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 27482 if (sps->pic_struct_present_flag && p->sei.picture_timing.present) {
529
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 2242 switch (p->sei.picture_timing.pic_struct) {
530 1421 case H264_SEI_PIC_STRUCT_TOP_BOTTOM:
531 case H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
532 1421 s->field_order = AV_FIELD_TT;
533 1421 break;
534 150 case H264_SEI_PIC_STRUCT_BOTTOM_TOP:
535 case H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
536 150 s->field_order = AV_FIELD_BB;
537 150 break;
538 671 default:
539 671 s->field_order = AV_FIELD_PROGRESSIVE;
540 671 break;
541 }
542 } else {
543
2/2
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 25240 if (field_poc[0] < field_poc[1])
544 1041 s->field_order = AV_FIELD_TT;
545
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 24199 else if (field_poc[0] > field_poc[1])
546 3 s->field_order = AV_FIELD_BB;
547
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 24196 else if (sps->mb_aff) {
548 /* Default to top field first
549 * This is the same as what the decoder does */
550 574 s->field_order = AV_FIELD_TT;
551 }
552 }
553 } else {
554
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 6521 if (p->picture_structure == PICT_TOP_FIELD)
555 3358 s->picture_structure = AV_PICTURE_STRUCTURE_TOP_FIELD;
556 else
557 3163 s->picture_structure = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
558
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 6521 if (p->poc.frame_num == p->last_frame_num &&
559
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 4910 p->last_picture_structure != AV_PICTURE_STRUCTURE_UNKNOWN &&
560
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 4910 p->last_picture_structure != AV_PICTURE_STRUCTURE_FRAME &&
561
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 4910 p->last_picture_structure != s->picture_structure) {
562
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 4786 if (p->last_picture_structure == AV_PICTURE_STRUCTURE_TOP_FIELD)
563 3157 s->field_order = AV_FIELD_TT;
564 else
565 1629 s->field_order = AV_FIELD_BB;
566 } else {
567 1735 s->field_order = AV_FIELD_UNKNOWN;
568 }
569 6521 p->last_picture_structure = s->picture_structure;
570 6521 p->last_frame_num = p->poc.frame_num;
571 }
572
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 34003 if (sps->timing_info_present_flag) {
573 10767 int64_t den = sps->time_scale;
574
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 10767 if (p->sei.common.unregistered.x264_build < 44U)
575 ✗ den *= 2;
576 10767 av_reduce(&avctx->framerate.den, &avctx->framerate.num,
577 10767 sps->num_units_in_tick * 2, den, 1 << 30);
578 }
579
580 34003 av_freep(&rbsp.rbsp_buffer);
581 34003 return 0; /* no need to evaluate the rest */
582 }
583 }
584
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 332 if (q264) {
585 ✗ av_freep(&rbsp.rbsp_buffer);
586 ✗ return 0;
587 }
588 /* didn't find a picture! */
589 332 av_log(avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
590 900 fail:
591 900 av_freep(&rbsp.rbsp_buffer);
592 900 return -1;
593 }
594
595 195945 static int h264_parse(AVCodecParserContext *s,
596 AVCodecContext *avctx,
597 const uint8_t **poutbuf, int *poutbuf_size,
598 const uint8_t *buf, int buf_size)
599 {
600 195945 H264ParseContext *p = s->priv_data;
601 195945 ParseContext *pc = &p->pc;
602 195945 AVRational time_base = { 0, 1 };
603 int next;
604
605
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 195945 if (!p->got_first) {
606 485 p->got_first = 1;
607
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 485 if (avctx->extradata_size) {
608 240 ff_h264_decode_extradata(avctx->extradata, avctx->extradata_size,
609 &p->ps, &p->is_avc, &p->nal_length_size,
610 avctx->err_recognition, avctx);
611 }
612 }
613
614
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 195945 if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
615 7394 next = buf_size;
616 } else {
617 188551 next = h264_find_frame_end(p, buf, buf_size, avctx);
618
619
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 188551 if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
620 160681 *poutbuf = NULL;
621 160681 *poutbuf_size = 0;
622 160681 return buf_size;
623 }
624
625
4/4
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 27870 if (next < 0 && next != END_NOT_FOUND) {
626 av_assert1(pc->last_index + next >= 0);
627 123 h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next, avctx); // update state
628 }
629 }
630
631 35264 parse_nal_units(s, avctx, buf, buf_size);
632
633
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 35264 if (avctx->framerate.num)
634 11227 time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){2, 1}));
635
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 35264 if (p->sei.picture_timing.cpb_removal_delay >= 0) {
636 2053 s->dts_sync_point = p->sei.buffering_period.present;
637 2053 s->dts_ref_dts_delta = p->sei.picture_timing.cpb_removal_delay;
638 2053 s->pts_dts_delta = p->sei.picture_timing.dpb_output_delay;
639 } else {
640 33211 s->dts_sync_point = INT_MIN;
641 33211 s->dts_ref_dts_delta = INT_MIN;
642 33211 s->pts_dts_delta = INT_MIN;
643 }
644
645
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 35264 if (s->flags & PARSER_FLAG_ONCE) {
646 ✗ s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
647 }
648
649
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 35264 if (s->dts_sync_point >= 0) {
650 2053 int64_t den = time_base.den * (int64_t)avctx->pkt_timebase.num;
651
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 2053 if (den > 0) {
652 2053 int64_t num = time_base.num * (int64_t)avctx->pkt_timebase.den;
653
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 2053 if (s->dts != AV_NOPTS_VALUE) {
654 // got DTS from the stream, update reference timestamp
655 1651 p->reference_dts = av_sat_sub64(s->dts, av_rescale(s->dts_ref_dts_delta, num, den));
656
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 402 } else if (p->reference_dts != AV_NOPTS_VALUE) {
657 // compute DTS based on reference timestamp
658 ✗ s->dts = av_sat_add64(p->reference_dts, av_rescale(s->dts_ref_dts_delta, num, den));
659 }
660
661
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 2053 if (p->reference_dts != AV_NOPTS_VALUE && s->pts == AV_NOPTS_VALUE) {
662 ✗ int64_t pts_dts_delta = av_rescale(s->pts_dts_delta, num, den);
663 ✗ uint64_t pts = (uint64_t)s->dts + pts_dts_delta;
664 ✗ if (pts == av_sat_add64(s->dts, pts_dts_delta))
665 ✗ s->pts = pts;
666 }
667
668
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 2053 if (s->dts_sync_point > 0)
669 184 p->reference_dts = s->dts; // new reference
670 }
671 }
672
673 35264 *poutbuf = buf;
674 35264 *poutbuf_size = buf_size;
675 35264 return next;
676 }
677
678 488 static av_cold void h264_close(AVCodecParserContext *s)
679 {
680 488 H264ParseContext *p = s->priv_data;
681 488 ParseContext *pc = &p->pc;
682
683 488 av_freep(&pc->buffer);
684
685 488 ff_h264_sei_uninit(&p->sei);
686 488 ff_h264_ps_uninit(&p->ps);
687 488 }
688
689 488 static av_cold int init(AVCodecParserContext *s)
690 {
691 488 H264ParseContext *p = s->priv_data;
692
693 488 p->reference_dts = AV_NOPTS_VALUE;
694 488 p->last_frame_num = INT_MAX;
695 488 ff_h264dsp_init(&p->h264dsp, 8, 1);
696 488 return 0;
697 }
698
699 const FFCodecParser ff_h264_parser = {
700 PARSER_CODEC_LIST(AV_CODEC_ID_H264),
701 .priv_data_size = sizeof(H264ParseContext),
702 .init = init,
703 .parse = h264_parse,
704 .close = h264_close,
705 };
706