FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/h264_parser.c
Date: 2022-07-04 19:11:22
Exec Total Coverage
Lines: 341 392 87.0%
Branches: 244 293 83.3%

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 "startcode.h"
51
52 typedef struct H264ParseContext {
53 ParseContext pc;
54 H264ParamSets ps;
55 H264DSPContext h264dsp;
56 H264POCContext poc;
57 H264SEIContext sei;
58 int is_avc;
59 int nal_length_size;
60 int got_first;
61 int picture_structure;
62 uint8_t parse_history[6];
63 int parse_history_count;
64 int parse_last_mb;
65 int64_t reference_dts;
66 int last_frame_num, last_picture_structure;
67 } H264ParseContext;
68
69 36351 static int find_start_code(const uint8_t *buf, int buf_size,
70 int buf_index, int next_avc)
71 {
72 36351 uint32_t state = -1;
73
74 36351 buf_index = avpriv_find_start_code(buf + buf_index, buf + next_avc + 1, &state) - buf - 1;
75
76 36351 return FFMIN(buf_index, buf_size);
77 }
78
79 179997 static int h264_find_frame_end(H264ParseContext *p, const uint8_t *buf,
80 int buf_size, void *logctx)
81 {
82 int i, j;
83 uint32_t state;
84 179997 ParseContext *pc = &p->pc;
85
86
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179997 int next_avc = p->is_avc ? 0 : buf_size;
87 // mb_addr= pc->mb_addr - 1;
88 179997 state = pc->state;
89
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179997 if (state > 13)
90 85 state = 7;
91
92
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179997 if (p->is_avc && !p->nal_length_size)
93 av_log(logctx, AV_LOG_ERROR, "AVC-parser: nal length size invalid\n");
94
95
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2651487 for (i = 0; i < buf_size; i++) {
96
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2495860 if (i >= next_avc) {
97 int64_t nalsize = 0;
98 i = next_avc;
99 for (j = 0; j < p->nal_length_size; j++)
100 nalsize = (nalsize << 8) | buf[i++];
101 if (!nalsize || nalsize > buf_size - i) {
102 av_log(logctx, AV_LOG_ERROR, "AVC-parser: nal size %"PRId64" "
103 "remaining %d\n", nalsize, buf_size - i);
104 return buf_size;
105 }
106 next_avc = i + nalsize;
107 state = 5;
108 }
109
110
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2495860 if (state == 7) {
111 1179946 i += p->h264dsp.startcode_find_candidate(buf + i, next_avc - i);
112
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1179946 if (i < next_avc)
113 1027014 state = 2;
114
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1315914 } else if (state <= 2) {
115
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1186706 if (buf[i] == 1)
116 93957 state ^= 5; // 2->7, 1->4, 0->5
117
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1092749 else if (buf[i])
118 933301 state = 7;
119 else
120 159448 state >>= 1; // 2->1, 1->0, 0->0
121
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129208 } else if (state <= 5) {
122 69203 int nalu_type = buf[i] & 0x1F;
123
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69203 if (nalu_type == H264_NAL_SEI || nalu_type == H264_NAL_SPS ||
124
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54114 nalu_type == H264_NAL_PPS || nalu_type == H264_NAL_AUD) {
125
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19552 if (pc->frame_start_found) {
126 8070 i++;
127 8070 goto found;
128 }
129
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49651 } else if (nalu_type == H264_NAL_SLICE || nalu_type == H264_NAL_DPA ||
130 nalu_type == H264_NAL_IDR_SLICE) {
131 49182 state += 8;
132 49182 continue;
133 }
134 11951 state = 7;
135 } else {
136 60005 unsigned int mb, last_mb = p->parse_last_mb;
137 GetBitContext gb;
138 60005 p->parse_history[p->parse_history_count++] = buf[i];
139
140 60005 init_get_bits(&gb, p->parse_history, 8*p->parse_history_count);
141 60005 mb= get_ue_golomb_long(&gb);
142
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60005 if (get_bits_left(&gb) > 0 || p->parse_history_count > 5) {
143 49182 p->parse_last_mb = mb;
144
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49182 if (pc->frame_start_found) {
145
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24586 if (mb <= last_mb) {
146 16300 i -= p->parse_history_count - 1;
147 16300 p->parse_history_count = 0;
148 16300 goto found;
149 }
150 } else
151 24596 pc->frame_start_found = 1;
152 32882 p->parse_history_count = 0;
153 32882 state = 7;
154 }
155 }
156 }
157 155627 pc->state = state;
158
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155627 if (p->is_avc)
159 return next_avc;
160 155627 return END_NOT_FOUND;
161
162 24370 found:
163 24370 pc->state = 7;
164 24370 pc->frame_start_found = 0;
165
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24370 if (p->is_avc)
166 return next_avc;
167 24370 return i - (state & 5);
168 }
169
170 18424 static int scan_mmco_reset(AVCodecParserContext *s, GetBitContext *gb,
171 void *logctx)
172 {
173 H264PredWeightTable pwt;
174 18424 int slice_type_nos = s->pict_type & 3;
175 18424 H264ParseContext *p = s->priv_data;
176 int list_count, ref_count[2];
177
178
179
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18424 if (p->ps.pps->redundant_pic_cnt_present)
180 get_ue_golomb(gb); // redundant_pic_count
181
182
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18424 if (slice_type_nos == AV_PICTURE_TYPE_B)
183 850 get_bits1(gb); // direct_spatial_mv_pred
184
185
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18424 if (ff_h264_parse_ref_count(&list_count, ref_count, gb, p->ps.pps,
186 slice_type_nos, p->picture_structure, logctx) < 0)
187 return AVERROR_INVALIDDATA;
188
189
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18424 if (slice_type_nos != AV_PICTURE_TYPE_I) {
190 int list;
191
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34180 for (list = 0; list < list_count; list++) {
192
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17515 if (get_bits1(gb)) {
193 int index;
194 13942 for (index = 0; ; index++) {
195 13942 unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(gb);
196
197
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13942 if (reordering_of_pic_nums_idc < 3)
198 11062 get_ue_golomb_long(gb);
199
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2880 else if (reordering_of_pic_nums_idc > 3) {
200 av_log(logctx, AV_LOG_ERROR,
201 "illegal reordering_of_pic_nums_idc %d\n",
202 reordering_of_pic_nums_idc);
203 return AVERROR_INVALIDDATA;
204 } else
205 2880 break;
206
207
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11062 if (index >= ref_count[list]) {
208 av_log(logctx, AV_LOG_ERROR,
209 "reference count %d overflow\n", index);
210 return AVERROR_INVALIDDATA;
211 }
212 }
213 }
214 }
215 }
216
217
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18424 if ((p->ps.pps->weighted_pred && slice_type_nos == AV_PICTURE_TYPE_P) ||
218
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16282 (p->ps.pps->weighted_bipred_idc == 1 && slice_type_nos == AV_PICTURE_TYPE_B))
219 2160 ff_h264_pred_weight_table(gb, p->ps.sps, ref_count, slice_type_nos,
220 &pwt, p->picture_structure, logctx);
221
222
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18424 if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
223 int i;
224
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5527 for (i = 0; i < H264_MAX_MMCO_COUNT; i++) {
225 5527 MMCOOpcode opcode = get_ue_golomb_31(gb);
226
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5527 if (opcode > (unsigned) MMCO_LONG) {
227 av_log(logctx, AV_LOG_ERROR,
228 "illegal memory management control operation %d\n",
229 opcode);
230 return AVERROR_INVALIDDATA;
231 }
232
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5527 if (opcode == MMCO_END)
233 1878 return 0;
234
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3649 else if (opcode == MMCO_RESET)
235 50 return 1;
236
237
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3599 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
238 3124 get_ue_golomb_long(gb); // difference_of_pic_nums_minus1
239
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3599 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
240
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3170 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
241 808 get_ue_golomb_31(gb);
242 }
243 }
244
245 16496 return 0;
246 }
247
248 /**
249 * Parse NAL units of found picture and decode some basic information.
250 *
251 * @param s parser context.
252 * @param avctx codec context.
253 * @param buf buffer with field/frame data.
254 * @param buf_size size of the buffer.
255 */
256 30711 static inline int parse_nal_units(AVCodecParserContext *s,
257 AVCodecContext *avctx,
258 const uint8_t * const buf, int buf_size)
259 {
260 30711 H264ParseContext *p = s->priv_data;
261 30711 H2645RBSP rbsp = { NULL };
262 30711 H2645NAL nal = { NULL };
263 int buf_index, next_avc;
264 unsigned int pps_id;
265 unsigned int slice_type;
266 30711 int state = -1, got_reset = 0;
267
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30711 int q264 = buf_size >=4 && !memcmp("Q264", buf, 4);
268 int field_poc[2];
269 int ret;
270
271 /* set some sane default values */
272 30711 s->pict_type = AV_PICTURE_TYPE_I;
273 30711 s->key_frame = 0;
274 30711 s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
275
276 30711 ff_h264_sei_uninit(&p->sei);
277 30711 p->sei.frame_packing.arrangement_cancel_flag = -1;
278 30711 p->sei.unregistered.x264_build = -1;
279
280
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30711 if (!buf_size)
281 295 return 0;
282
283 30416 av_fast_padded_malloc(&rbsp.rbsp_buffer, &rbsp.rbsp_buffer_alloc_size, buf_size);
284
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30416 if (!rbsp.rbsp_buffer)
285 return AVERROR(ENOMEM);
286
287 30416 buf_index = 0;
288
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30416 next_avc = p->is_avc ? 0 : buf_size;
289 14519 for (;;) {
290 const SPS *sps;
291 44935 int src_length, consumed, nalsize = 0;
292
293
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44935 if (buf_index >= next_avc) {
294 8584 nalsize = get_nalsize(p->nal_length_size, buf, buf_size, &buf_index, avctx);
295
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8584 if (nalsize < 0)
296 332 break;
297 8252 next_avc = buf_index + nalsize;
298 } else {
299 36351 buf_index = find_start_code(buf, buf_size, buf_index, next_avc);
300
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36351 if (buf_index >= buf_size)
301 break;
302
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36351 if (buf_index >= next_avc)
303 continue;
304 }
305 44603 src_length = next_avc - buf_index;
306
307 44603 state = buf[buf_index];
308
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44603 switch (state & 0x1f) {
309 30084 case H264_NAL_SLICE:
310 case H264_NAL_IDR_SLICE:
311 // Do not walk the whole buffer just to decode slice header
312
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30084 if ((state & 0x1f) == H264_NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
313 /* IDR or disposable slice
314 * No need to decode many bytes because MMCOs shall not be present. */
315
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11118 if (src_length > 60)
316 10795 src_length = 60;
317 } else {
318 /* To decode up to MMCOs */
319
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18966 if (src_length > 1000)
320 10797 src_length = 1000;
321 }
322 30084 break;
323 }
324 44603 consumed = ff_h2645_extract_rbsp(buf + buf_index, src_length, &rbsp, &nal, 1);
325
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44603 if (consumed < 0)
326 break;
327
328 44603 buf_index += consumed;
329
330 44603 ret = init_get_bits8(&nal.gb, nal.data, nal.size);
331
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44603 if (ret < 0)
332 goto fail;
333 44603 get_bits1(&nal.gb);
334 44603 nal.ref_idc = get_bits(&nal.gb, 2);
335 44603 nal.type = get_bits(&nal.gb, 5);
336
337
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44603 switch (nal.type) {
338 838 case H264_NAL_SPS:
339 838 ff_h264_decode_seq_parameter_set(&nal.gb, avctx, &p->ps, 0);
340 838 break;
341 6979 case H264_NAL_PPS:
342 6979 ff_h264_decode_picture_parameter_set(&nal.gb, avctx, &p->ps,
343 nal.size_bits);
344 6979 break;
345 3432 case H264_NAL_SEI:
346 3432 ff_h264_sei_decode(&p->sei, &nal.gb, &p->ps, avctx);
347 3432 break;
348 800 case H264_NAL_IDR_SLICE:
349 800 s->key_frame = 1;
350
351 800 p->poc.prev_frame_num = 0;
352 800 p->poc.prev_frame_num_offset = 0;
353 800 p->poc.prev_poc_msb =
354 800 p->poc.prev_poc_lsb = 0;
355 /* fall through */
356 30084 case H264_NAL_SLICE:
357 30084 get_ue_golomb_long(&nal.gb); // skip first_mb_in_slice
358 30084 slice_type = get_ue_golomb_31(&nal.gb);
359 30084 s->pict_type = ff_h264_golomb_to_pict_type[slice_type % 5];
360
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30084 if (p->sei.recovery_point.recovery_frame_cnt >= 0) {
361 /* key frame, since recovery_frame_cnt is set */
362 158 s->key_frame = 1;
363 }
364 30084 pps_id = get_ue_golomb(&nal.gb);
365
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30084 if (pps_id >= MAX_PPS_COUNT) {
366 av_log(avctx, AV_LOG_ERROR,
367 "pps_id %u out of range\n", pps_id);
368 goto fail;
369 }
370
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30084 if (!p->ps.pps_list[pps_id]) {
371 568 av_log(avctx, AV_LOG_ERROR,
372 "non-existing PPS %u referenced\n", pps_id);
373 568 goto fail;
374 }
375
376 29516 av_buffer_unref(&p->ps.pps_ref);
377 29516 p->ps.pps = NULL;
378 29516 p->ps.sps = NULL;
379 29516 p->ps.pps_ref = av_buffer_ref(p->ps.pps_list[pps_id]);
380
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29516 if (!p->ps.pps_ref)
381 goto fail;
382 29516 p->ps.pps = (const PPS*)p->ps.pps_ref->data;
383 29516 p->ps.sps = p->ps.pps->sps;
384 29516 sps = p->ps.sps;
385
386 // heuristic to detect non marked keyframes
387
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29516 if (p->ps.sps->ref_frame_count <= 1 && p->ps.pps->ref_count[0] <= 1 && s->pict_type == AV_PICTURE_TYPE_I)
388 1025 s->key_frame = 1;
389
390 29516 p->poc.frame_num = get_bits(&nal.gb, sps->log2_max_frame_num);
391
392 29516 s->coded_width = 16 * sps->mb_width;
393 29516 s->coded_height = 16 * sps->mb_height;
394 29516 s->width = s->coded_width - (sps->crop_right + sps->crop_left);
395 29516 s->height = s->coded_height - (sps->crop_top + sps->crop_bottom);
396
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29516 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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29516 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;
407 219 case 10:
408
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219 if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P10;
409
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169 else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P10;
410 82 else s->format = AV_PIX_FMT_YUV420P10;
411 219 break;
412 29147 case 8:
413
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29147 if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P;
414
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28260 else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P;
415 28250 else s->format = AV_PIX_FMT_YUV420P;
416 29147 break;
417 default:
418 s->format = AV_PIX_FMT_NONE;
419 }
420
421 29516 avctx->profile = ff_h264_get_profile(sps);
422 29516 avctx->level = sps->level_idc;
423
424
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29516 if (sps->frame_mbs_only_flag) {
425 20902 p->picture_structure = PICT_FRAME;
426 } else {
427
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8614 if (get_bits1(&nal.gb)) { // field_pic_flag
428 6222 p->picture_structure = PICT_TOP_FIELD + get_bits1(&nal.gb); // bottom_field_flag
429 } else {
430 2392 p->picture_structure = PICT_FRAME;
431 }
432 }
433
434
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29516 if (nal.type == H264_NAL_IDR_SLICE)
435 798 get_ue_golomb_long(&nal.gb); /* idr_pic_id */
436
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29516 if (sps->poc_type == 0) {
437 22388 p->poc.poc_lsb = get_bits(&nal.gb, sps->log2_max_poc_lsb);
438
439
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22388 if (p->ps.pps->pic_order_present == 1 &&
440
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3552 p->picture_structure == PICT_FRAME)
441 2655 p->poc.delta_poc_bottom = get_se_golomb(&nal.gb);
442 }
443
444
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29516 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 29516 field_poc[0] = field_poc[1] = INT_MAX;
456 29516 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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29516 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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29516 if (nal.ref_idc && nal.type != H264_NAL_IDR_SLICE) {
466 18424 got_reset = scan_mmco_reset(s, &nal.gb, avctx);
467
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18424 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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29516 p->poc.prev_frame_num = got_reset ? 0 : p->poc.frame_num;
473
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29516 p->poc.prev_frame_num_offset = got_reset ? 0 : p->poc.frame_num_offset;
474
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29516 if (nal.ref_idc != 0) {
475
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19222 if (!got_reset) {
476 19172 p->poc.prev_poc_msb = p->poc.poc_msb;
477 19172 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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29516 if (p->sei.picture_timing.present) {
486 2384 ret = ff_h264_sei_process_picture_timing(&p->sei.picture_timing,
487 sps, avctx);
488
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2384 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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29516 if (sps->pic_struct_present_flag && p->sei.picture_timing.present) {
495
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4744 switch (p->sei.picture_timing.pic_struct) {
496 762 case H264_SEI_PIC_STRUCT_TOP_FIELD:
497 case H264_SEI_PIC_STRUCT_BOTTOM_FIELD:
498 762 s->repeat_pict = 0;
499 762 break;
500 1472 case H264_SEI_PIC_STRUCT_FRAME:
501 case H264_SEI_PIC_STRUCT_TOP_BOTTOM:
502 case H264_SEI_PIC_STRUCT_BOTTOM_TOP:
503 1472 s->repeat_pict = 1;
504 1472 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 27144 s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
521 }
522
523
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29516 if (p->picture_structure == PICT_FRAME) {
524 23294 s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
525
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23294 if (sps->pic_struct_present_flag && p->sei.picture_timing.present) {
526
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3220 switch (p->sei.picture_timing.pic_struct) {
527 885 case H264_SEI_PIC_STRUCT_TOP_BOTTOM:
528 case H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
529 885 s->field_order = AV_FIELD_TT;
530 885 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;
535 575 default:
536 575 s->field_order = AV_FIELD_PROGRESSIVE;
537 575 break;
538 }
539 } else {
540
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21684 if (field_poc[0] < field_poc[1])
541 1041 s->field_order = AV_FIELD_TT;
542
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20643 else if (field_poc[0] > field_poc[1])
543 3 s->field_order = AV_FIELD_BB;
544 else
545 20640 s->field_order = AV_FIELD_PROGRESSIVE;
546 }
547 } else {
548
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6222 if (p->picture_structure == PICT_TOP_FIELD)
549 3203 s->picture_structure = AV_PICTURE_STRUCTURE_TOP_FIELD;
550 else
551 3019 s->picture_structure = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
552
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6222 if (p->poc.frame_num == p->last_frame_num &&
553
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4714 p->last_picture_structure != AV_PICTURE_STRUCTURE_UNKNOWN &&
554
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4714 p->last_picture_structure != AV_PICTURE_STRUCTURE_FRAME &&
555
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4714 p->last_picture_structure != s->picture_structure) {
556
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4597 if (p->last_picture_structure == AV_PICTURE_STRUCTURE_TOP_FIELD)
557 3013 s->field_order = AV_FIELD_TT;
558 else
559 1584 s->field_order = AV_FIELD_BB;
560 } else {
561 1625 s->field_order = AV_FIELD_UNKNOWN;
562 }
563 6222 p->last_picture_structure = s->picture_structure;
564 6222 p->last_frame_num = p->poc.frame_num;
565 }
566
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29516 if (sps->timing_info_present_flag) {
567 7229 int64_t den = sps->time_scale;
568
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7229 if (p->sei.unregistered.x264_build < 44U)
569 den *= 2;
570 7229 av_reduce(&avctx->framerate.den, &avctx->framerate.num,
571 7229 sps->num_units_in_tick * avctx->ticks_per_frame, den, 1 << 30);
572 }
573
574 29516 av_freep(&rbsp.rbsp_buffer);
575 29516 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 185782 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 185782 H264ParseContext *p = s->priv_data;
595 185782 ParseContext *pc = &p->pc;
596 int next;
597
598
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185782 if (!p->got_first) {
599 408 p->got_first = 1;
600
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408 if (avctx->extradata_size) {
601 186 ff_h264_decode_extradata(avctx->extradata, avctx->extradata_size,
602 &p->ps, &p->is_avc, &p->nal_length_size,
603 avctx->err_recognition, avctx);
604 }
605 }
606
607
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185782 if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
608 5893 next = buf_size;
609 } else {
610 179889 next = h264_find_frame_end(p, buf, buf_size, avctx);
611
612
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179889 if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
613 155071 *poutbuf = NULL;
614 155071 *poutbuf_size = 0;
615 155071 return buf_size;
616 }
617
618
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24818 if (next < 0 && next != END_NOT_FOUND) {
619 av_assert1(pc->last_index + next >= 0);
620 108 h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next, avctx); // update state
621 }
622 }
623
624 30711 parse_nal_units(s, avctx, buf, buf_size);
625
626
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30711 if (avctx->framerate.num)
627 29855 avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){avctx->ticks_per_frame, 1}));
628
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30711 if (p->sei.picture_timing.cpb_removal_delay >= 0) {
629 1431 s->dts_sync_point = p->sei.buffering_period.present;
630 1431 s->dts_ref_dts_delta = p->sei.picture_timing.cpb_removal_delay;
631 1431 s->pts_dts_delta = p->sei.picture_timing.dpb_output_delay;
632 } else {
633 29280 s->dts_sync_point = INT_MIN;
634 29280 s->dts_ref_dts_delta = INT_MIN;
635 29280 s->pts_dts_delta = INT_MIN;
636 }
637
638
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30711 if (s->flags & PARSER_FLAG_ONCE) {
639 s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
640 }
641
642
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30711 if (s->dts_sync_point >= 0) {
643 1431 int64_t den = avctx->time_base.den * (int64_t)avctx->pkt_timebase.num;
644
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1431 if (den > 0) {
645 1431 int64_t num = avctx->time_base.num * (int64_t)avctx->pkt_timebase.den;
646
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1431 if (s->dts != AV_NOPTS_VALUE) {
647 // got DTS from the stream, update reference timestamp
648 1029 p->reference_dts = s->dts - av_rescale(s->dts_ref_dts_delta, num, den);
649
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402 } else if (p->reference_dts != AV_NOPTS_VALUE) {
650 // compute DTS based on reference timestamp
651 s->dts = p->reference_dts + av_rescale(s->dts_ref_dts_delta, num, den);
652 }
653
654
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1431 if (p->reference_dts != AV_NOPTS_VALUE && s->pts == AV_NOPTS_VALUE)
655 s->pts = s->dts + av_rescale(s->pts_dts_delta, num, den);
656
657
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1431 if (s->dts_sync_point > 0)
658 109 p->reference_dts = s->dts; // new reference
659 }
660 }
661
662 30711 *poutbuf = buf;
663 30711 *poutbuf_size = buf_size;
664 30711 return next;
665 }
666
667 409 static void h264_close(AVCodecParserContext *s)
668 {
669 409 H264ParseContext *p = s->priv_data;
670 409 ParseContext *pc = &p->pc;
671
672 409 av_freep(&pc->buffer);
673
674 409 ff_h264_sei_uninit(&p->sei);
675 409 ff_h264_ps_uninit(&p->ps);
676 409 }
677
678 409 static av_cold int init(AVCodecParserContext *s)
679 {
680 409 H264ParseContext *p = s->priv_data;
681
682 409 p->reference_dts = AV_NOPTS_VALUE;
683 409 p->last_frame_num = INT_MAX;
684 409 ff_h264dsp_init(&p->h264dsp, 8, 1);
685 409 return 0;
686 }
687
688 const AVCodecParser ff_h264_parser = {
689 .codec_ids = { AV_CODEC_ID_H264 },
690 .priv_data_size = sizeof(H264ParseContext),
691 .parser_init = init,
692 .parser_parse = h264_parse,
693 .parser_close = h264_close,
694 };
695