h264: do not abuse the context as a temporary storage in get_last_needed_nal()
[libav.git] / libavcodec / h264_parser.c
CommitLineData
26b4fe82
AJ
1/*
2 * H.26L/H.264/AVC/JVT/14496-10/... parser
3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
4 *
2912e87a 5 * This file is part of Libav.
26b4fe82 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
26b4fe82
AJ
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 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
26b4fe82
AJ
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
2912e87a 18 * License along with Libav; if not, write to the Free Software
26b4fe82 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26b4fe82
AJ
20 */
21
22/**
ba87f080 23 * @file
26b4fe82
AJ
24 * H.264 / AVC / MPEG4 part10 parser.
25 * @author Michael Niedermayer <michaelni@gmx.at>
26 */
27
6fee1b90 28#include "libavutil/attributes.h"
26b4fe82 29#include "parser.h"
ff6474dd
IS
30#include "h264data.h"
31#include "golomb.h"
f1e93986 32#include "internal.h"
e0c16e4e 33#include "mpegutils.h"
26b4fe82
AJ
34
35#include <assert.h>
36
9404a47a
AK
37typedef struct H264ParseContext {
38 H264Context h;
39 ParseContext pc;
40 int got_first;
41} H264ParseContext;
26b4fe82 42
9404a47a
AK
43
44static int h264_find_frame_end(H264ParseContext *p, const uint8_t *buf,
f8a4d5e9 45 int buf_size)
26b4fe82 46{
9404a47a 47 H264Context *h = &p->h;
26b4fe82
AJ
48 int i;
49 uint32_t state;
9404a47a 50 ParseContext *pc = &p->pc;
26b4fe82 51// mb_addr= pc->mb_addr - 1;
f8a4d5e9
LB
52 state = pc->state;
53 if (state > 13)
54 state = 7;
26b4fe82 55
f8a4d5e9
LB
56 for (i = 0; i < buf_size; i++) {
57 if (state == 7) {
db7f1c7c 58 i += h->h264dsp.startcode_find_candidate(buf + i, buf_size - i);
218d6844
BA
59 if (i < buf_size)
60 state = 2;
f8a4d5e9
LB
61 } else if (state <= 2) {
62 if (buf[i] == 1)
63 state ^= 5; // 2->7, 1->4, 0->5
64 else if (buf[i])
65 state = 7;
66 else
67 state >>= 1; // 2->1, 1->0, 0->0
68 } else if (state <= 5) {
dc971acf
VG
69 int nalu_type = buf[i] & 0x1F;
70 if (nalu_type == NAL_SEI || nalu_type == NAL_SPS ||
71 nalu_type == NAL_PPS || nalu_type == NAL_AUD) {
f8a4d5e9 72 if (pc->frame_start_found) {
26b4fe82 73 i++;
9aa1cfec 74 goto found;
26b4fe82 75 }
dc971acf
VG
76 } else if (nalu_type == NAL_SLICE || nalu_type == NAL_DPA ||
77 nalu_type == NAL_IDR_SLICE) {
f8a4d5e9
LB
78 if (pc->frame_start_found) {
79 state += 8;
26b4fe82 80 continue;
f8a4d5e9 81 } else
26b4fe82
AJ
82 pc->frame_start_found = 1;
83 }
f8a4d5e9
LB
84 state = 7;
85 } else {
58ae8d59 86 // first_mb_in_slice is 0, probably the first nal of a new slice
f8a4d5e9 87 if (buf[i] & 0x80)
26b4fe82 88 goto found;
f8a4d5e9 89 state = 7;
26b4fe82
AJ
90 }
91 }
f8a4d5e9 92 pc->state = state;
26b4fe82 93 return END_NOT_FOUND;
9aa1cfec
DP
94
95found:
f8a4d5e9
LB
96 pc->state = 7;
97 pc->frame_start_found = 0;
98 return i - (state & 5);
26b4fe82
AJ
99}
100
4baba6c8
YN
101static int scan_mmco_reset(AVCodecParserContext *s)
102{
9404a47a
AK
103 H264ParseContext *p = s->priv_data;
104 H264Context *h = &p->h;
92c6c2a6 105 H264SliceContext *sl = &h->slice_ctx[0];
4baba6c8 106
56febc99 107 sl->slice_type_nos = s->pict_type & 3;
4baba6c8
YN
108
109 if (h->pps.redundant_pic_cnt_present)
110 get_ue_golomb(&h->gb); // redundant_pic_count
111
56febc99 112 if (ff_set_ref_count(h, sl) < 0)
4baba6c8
YN
113 return AVERROR_INVALIDDATA;
114
56febc99 115 if (sl->slice_type_nos != AV_PICTURE_TYPE_I) {
4baba6c8 116 int list;
95eb35f3 117 for (list = 0; list < sl->list_count; list++) {
4baba6c8
YN
118 if (get_bits1(&h->gb)) {
119 int index;
120 for (index = 0; ; index++) {
121 unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(&h->gb);
122
123 if (reordering_of_pic_nums_idc < 3)
124 get_ue_golomb(&h->gb);
125 else if (reordering_of_pic_nums_idc > 3) {
126 av_log(h->avctx, AV_LOG_ERROR,
127 "illegal reordering_of_pic_nums_idc %d\n",
128 reordering_of_pic_nums_idc);
129 return AVERROR_INVALIDDATA;
130 } else
131 break;
132
95eb35f3 133 if (index >= sl->ref_count[list]) {
73e8fab3
VG
134 av_log(h->avctx, AV_LOG_ERROR,
135 "reference count %d overflow\n", index);
4baba6c8
YN
136 return AVERROR_INVALIDDATA;
137 }
138 }
139 }
140 }
141 }
142
56febc99
AK
143 if ((h->pps.weighted_pred && sl->slice_type_nos == AV_PICTURE_TYPE_P) ||
144 (h->pps.weighted_bipred_idc == 1 && sl->slice_type_nos == AV_PICTURE_TYPE_B))
92c6c2a6 145 ff_pred_weight_table(h, sl);
4baba6c8
YN
146
147 if (get_bits1(&h->gb)) { // adaptive_ref_pic_marking_mode_flag
148 int i;
149 for (i = 0; i < MAX_MMCO_COUNT; i++) {
150 MMCOOpcode opcode = get_ue_golomb_31(&h->gb);
151 if (opcode > (unsigned) MMCO_LONG) {
152 av_log(h->avctx, AV_LOG_ERROR,
153 "illegal memory management control operation %d\n",
154 opcode);
155 return AVERROR_INVALIDDATA;
156 }
157 if (opcode == MMCO_END)
158 return 0;
159 else if (opcode == MMCO_RESET)
160 return 1;
161
162 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
163 get_ue_golomb(&h->gb);
164 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
165 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
166 get_ue_golomb_31(&h->gb);
167 }
168 }
169
170 return 0;
171}
172
adbfc605 173/**
ff6474dd
IS
174 * Parse NAL units of found picture and decode some basic information.
175 *
176 * @param s parser context.
177 * @param avctx codec context.
178 * @param buf buffer with field/frame data.
179 * @param buf_size size of the buffer.
180 */
181static inline int parse_nal_units(AVCodecParserContext *s,
182 AVCodecContext *avctx,
183 const uint8_t *buf, int buf_size)
184{
9404a47a
AK
185 H264ParseContext *p = s->priv_data;
186 H264Context *h = &p->h;
ff6474dd 187 const uint8_t *buf_end = buf + buf_size;
96c3da93 188 unsigned int pps_id;
ff6474dd 189 unsigned int slice_type;
4baba6c8 190 int state = -1, got_reset = 0;
ff6474dd 191 const uint8_t *ptr;
3f1a7ceb 192 int field_poc[2];
ff6474dd
IS
193
194 /* set some sane default values */
f8a4d5e9
LB
195 s->pict_type = AV_PICTURE_TYPE_I;
196 s->key_frame = 0;
3f1a7ceb 197 s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
ff6474dd 198
103d073d
YN
199 h->avctx = avctx;
200 ff_h264_reset_sei(h);
ff6474dd 201
9479415e
BC
202 if (!buf_size)
203 return 0;
204
f8a4d5e9 205 for (;;) {
ff6474dd 206 int src_length, dst_length, consumed;
f1e93986 207 buf = avpriv_find_start_code(buf, buf_end, &state);
f8a4d5e9 208 if (buf >= buf_end)
ff6474dd
IS
209 break;
210 --buf;
211 src_length = buf_end - buf;
212 switch (state & 0x1f) {
213 case NAL_SLICE:
214 case NAL_IDR_SLICE:
215 // Do not walk the whole buffer just to decode slice header
19f53840 216 if ((state & 0x1f) == NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
4baba6c8
YN
217 /* IDR or disposable slice
218 * No need to decode many bytes because MMCOs shall not be present. */
219 if (src_length > 60)
220 src_length = 60;
221 } else {
222 /* To decode up to MMCOs */
223 if (src_length > 1000)
224 src_length = 1000;
225 }
ff6474dd
IS
226 break;
227 }
f8a4d5e9 228 ptr = ff_h264_decode_nal(h, buf, &dst_length, &consumed, src_length);
f929ab05 229 if (!ptr || dst_length < 0)
ff6474dd
IS
230 break;
231
f8a4d5e9
LB
232 init_get_bits(&h->gb, ptr, 8 * dst_length);
233 switch (h->nal_unit_type) {
ff6474dd
IS
234 case NAL_SPS:
235 ff_h264_decode_seq_parameter_set(h);
236 break;
237 case NAL_PPS:
2c541554 238 ff_h264_decode_picture_parameter_set(h, h->gb.size_in_bits);
ff6474dd
IS
239 break;
240 case NAL_SEI:
241 ff_h264_decode_sei(h);
242 break;
243 case NAL_IDR_SLICE:
0ed260c7 244 s->key_frame = 1;
3f1a7ceb
YN
245
246 h->prev_frame_num = 0;
247 h->prev_frame_num_offset = 0;
248 h->prev_poc_msb =
249 h->prev_poc_lsb = 0;
f8a4d5e9 250 /* fall through */
ff6474dd 251 case NAL_SLICE:
2c541554 252 get_ue_golomb(&h->gb); // skip first_mb_in_slice
f8a4d5e9 253 slice_type = get_ue_golomb_31(&h->gb);
ff6474dd 254 s->pict_type = golomb_to_pict_type[slice_type % 5];
0ed260c7
IS
255 if (h->sei_recovery_frame_cnt >= 0) {
256 /* key frame, since recovery_frame_cnt is set */
257 s->key_frame = 1;
258 }
f8a4d5e9
LB
259 pps_id = get_ue_golomb(&h->gb);
260 if (pps_id >= MAX_PPS_COUNT) {
261 av_log(h->avctx, AV_LOG_ERROR,
73e8fab3 262 "pps_id %u out of range\n", pps_id);
96c3da93
IS
263 return -1;
264 }
f8a4d5e9
LB
265 if (!h->pps_buffers[pps_id]) {
266 av_log(h->avctx, AV_LOG_ERROR,
73e8fab3 267 "non-existing PPS %u referenced\n", pps_id);
96c3da93
IS
268 return -1;
269 }
f8a4d5e9
LB
270 h->pps = *h->pps_buffers[pps_id];
271 if (!h->sps_buffers[h->pps.sps_id]) {
272 av_log(h->avctx, AV_LOG_ERROR,
73e8fab3 273 "non-existing SPS %u referenced\n", h->pps.sps_id);
96c3da93
IS
274 return -1;
275 }
f8a4d5e9 276 h->sps = *h->sps_buffers[h->pps.sps_id];
2c541554 277 h->frame_num = get_bits(&h->gb, h->sps.log2_max_frame_num);
96c3da93 278
31d2039c
AK
279 s->coded_width = 16 * h->sps.mb_width;
280 s->coded_height = 16 * h->sps.mb_height;
281 s->width = s->coded_width - (h->sps.crop_right + h->sps.crop_left);
282 s->height = s->coded_height - (h->sps.crop_top + h->sps.crop_bottom);
283 if (s->width <= 0 || s->height <= 0) {
284 s->width = s->coded_width;
285 s->height = s->coded_height;
286 }
287
288 switch (h->sps.bit_depth_luma) {
289 case 9:
290 if (CHROMA444(h)) s->format = AV_PIX_FMT_YUV444P9;
291 else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P9;
292 else s->format = AV_PIX_FMT_YUV420P9;
293 break;
294 case 10:
295 if (CHROMA444(h)) s->format = AV_PIX_FMT_YUV444P10;
296 else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P10;
297 else s->format = AV_PIX_FMT_YUV420P10;
298 break;
299 case 8:
300 if (CHROMA444(h)) s->format = AV_PIX_FMT_YUV444P;
301 else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P;
302 else s->format = AV_PIX_FMT_YUV420P;
303 break;
304 default:
305 s->format = AV_PIX_FMT_NONE;
306 }
307
fe9a3fbe 308 avctx->profile = ff_h264_get_profile(&h->sps);
dd0cd3d2
RC
309 avctx->level = h->sps.level_idc;
310
f8a4d5e9
LB
311 if (h->sps.frame_mbs_only_flag) {
312 h->picture_structure = PICT_FRAME;
313 } else {
314 if (get_bits1(&h->gb)) { // field_pic_flag
315 h->picture_structure = PICT_TOP_FIELD + get_bits1(&h->gb); // bottom_field_flag
96c3da93 316 } else {
f8a4d5e9 317 h->picture_structure = PICT_FRAME;
96c3da93
IS
318 }
319 }
320
3f1a7ceb
YN
321 if (h->nal_unit_type == NAL_IDR_SLICE)
322 get_ue_golomb(&h->gb); /* idr_pic_id */
323 if (h->sps.poc_type == 0) {
324 h->poc_lsb = get_bits(&h->gb, h->sps.log2_max_poc_lsb);
325
f8a4d5e9
LB
326 if (h->pps.pic_order_present == 1 &&
327 h->picture_structure == PICT_FRAME)
3f1a7ceb
YN
328 h->delta_poc_bottom = get_se_golomb(&h->gb);
329 }
330
f8a4d5e9
LB
331 if (h->sps.poc_type == 1 &&
332 !h->sps.delta_pic_order_always_zero_flag) {
3f1a7ceb
YN
333 h->delta_poc[0] = get_se_golomb(&h->gb);
334
f8a4d5e9
LB
335 if (h->pps.pic_order_present == 1 &&
336 h->picture_structure == PICT_FRAME)
3f1a7ceb
YN
337 h->delta_poc[1] = get_se_golomb(&h->gb);
338 }
339
4baba6c8
YN
340 /* Decode POC of this picture.
341 * The prev_ values needed for decoding POC of the next picture are not set here. */
b81dbd6c 342 field_poc[0] = field_poc[1] = INT_MAX;
a8b19271 343 ff_init_poc(h, field_poc, &s->output_picture_number);
3f1a7ceb 344
4baba6c8
YN
345 /* Continue parsing to check if MMCO_RESET is present.
346 * FIXME: MMCO_RESET could appear in non-first slice.
347 * Maybe, we should parse all undisposable non-IDR slice of this
348 * picture until encountering MMCO_RESET in a slice of it. */
349 if (h->nal_ref_idc && h->nal_unit_type != NAL_IDR_SLICE) {
350 got_reset = scan_mmco_reset(s);
351 if (got_reset < 0)
352 return got_reset;
353 }
354
b81dbd6c 355 /* Set up the prev_ values for decoding POC of the next picture. */
4baba6c8
YN
356 h->prev_frame_num = got_reset ? 0 : h->frame_num;
357 h->prev_frame_num_offset = got_reset ? 0 : h->frame_num_offset;
b81dbd6c 358 if (h->nal_ref_idc != 0) {
4baba6c8
YN
359 if (!got_reset) {
360 h->prev_poc_msb = h->poc_msb;
361 h->prev_poc_lsb = h->poc_lsb;
362 } else {
363 h->prev_poc_msb = 0;
364 h->prev_poc_lsb =
365 h->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
366 }
b81dbd6c
YN
367 }
368
f8a4d5e9 369 if (h->sps.pic_struct_present_flag) {
346db3ef 370 switch (h->sei_pic_struct) {
f8a4d5e9
LB
371 case SEI_PIC_STRUCT_TOP_FIELD:
372 case SEI_PIC_STRUCT_BOTTOM_FIELD:
373 s->repeat_pict = 0;
374 break;
375 case SEI_PIC_STRUCT_FRAME:
376 case SEI_PIC_STRUCT_TOP_BOTTOM:
377 case SEI_PIC_STRUCT_BOTTOM_TOP:
378 s->repeat_pict = 1;
379 break;
380 case SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
381 case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
382 s->repeat_pict = 2;
383 break;
384 case SEI_PIC_STRUCT_FRAME_DOUBLING:
385 s->repeat_pict = 3;
386 break;
387 case SEI_PIC_STRUCT_FRAME_TRIPLING:
388 s->repeat_pict = 5;
389 break;
390 default:
391 s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
392 break;
346db3ef
IS
393 }
394 } else {
2c541554 395 s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
346db3ef
IS
396 }
397
3f1a7ceb
YN
398 if (h->picture_structure == PICT_FRAME) {
399 s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
400 if (h->sps.pic_struct_present_flag) {
401 switch (h->sei_pic_struct) {
f8a4d5e9
LB
402 case SEI_PIC_STRUCT_TOP_BOTTOM:
403 case SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
404 s->field_order = AV_FIELD_TT;
405 break;
406 case SEI_PIC_STRUCT_BOTTOM_TOP:
407 case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
408 s->field_order = AV_FIELD_BB;
409 break;
410 default:
411 s->field_order = AV_FIELD_PROGRESSIVE;
412 break;
3f1a7ceb
YN
413 }
414 } else {
415 if (field_poc[0] < field_poc[1])
416 s->field_order = AV_FIELD_TT;
417 else if (field_poc[0] > field_poc[1])
418 s->field_order = AV_FIELD_BB;
419 else
420 s->field_order = AV_FIELD_PROGRESSIVE;
421 }
422 } else {
423 if (h->picture_structure == PICT_TOP_FIELD)
424 s->picture_structure = AV_PICTURE_STRUCTURE_TOP_FIELD;
425 else
426 s->picture_structure = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
427 s->field_order = AV_FIELD_UNKNOWN;
428 }
429
ff6474dd
IS
430 return 0; /* no need to evaluate the rest */
431 }
432 buf += consumed;
433 }
434 /* didn't find a picture! */
2c541554 435 av_log(h->avctx, AV_LOG_ERROR, "missing picture in access unit\n");
ff6474dd
IS
436 return -1;
437}
438
26b4fe82
AJ
439static int h264_parse(AVCodecParserContext *s,
440 AVCodecContext *avctx,
441 const uint8_t **poutbuf, int *poutbuf_size,
442 const uint8_t *buf, int buf_size)
443{
9404a47a
AK
444 H264ParseContext *p = s->priv_data;
445 H264Context *h = &p->h;
446 ParseContext *pc = &p->pc;
26b4fe82
AJ
447 int next;
448
9404a47a
AK
449 if (!p->got_first) {
450 p->got_first = 1;
23584bec 451 if (avctx->extradata_size) {
2c541554 452 h->avctx = avctx;
790a367d
RT
453 // must be done like in the decoder.
454 // otherwise opening the parser, creating extradata,
455 // and then closing and opening again
456 // will cause has_b_frames to be always set.
457 // NB: estimate_timings_from_pts behaves exactly like this.
458 if (!avctx->has_b_frames)
2c541554 459 h->low_delay = 1;
23584bec
HC
460 ff_h264_decode_extradata(h);
461 }
462 }
463
f8a4d5e9
LB
464 if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
465 next = buf_size;
466 } else {
9404a47a 467 next = h264_find_frame_end(p, buf, buf_size);
26b4fe82
AJ
468
469 if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
f8a4d5e9 470 *poutbuf = NULL;
26b4fe82
AJ
471 *poutbuf_size = 0;
472 return buf_size;
473 }
474
f8a4d5e9
LB
475 if (next < 0 && next != END_NOT_FOUND) {
476 assert(pc->last_index + next >= 0);
9404a47a 477 h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next); // update state
26b4fe82 478 }
a26ce1e2 479 }
ff6474dd 480
25f05ddb 481 parse_nal_units(s, avctx, buf, buf_size);
c733922e 482
25f05ddb
PL
483 if (h->sei_cpb_removal_delay >= 0) {
484 s->dts_sync_point = h->sei_buffering_period_present;
485 s->dts_ref_dts_delta = h->sei_cpb_removal_delay;
486 s->pts_dts_delta = h->sei_dpb_output_delay;
487 } else {
488 s->dts_sync_point = INT_MIN;
489 s->dts_ref_dts_delta = INT_MIN;
490 s->pts_dts_delta = INT_MIN;
491 }
492
493 if (s->flags & PARSER_FLAG_ONCE) {
494 s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
495 }
26b4fe82 496
f8a4d5e9 497 *poutbuf = buf;
26b4fe82
AJ
498 *poutbuf_size = buf_size;
499 return next;
500}
501
502static int h264_split(AVCodecContext *avctx,
503 const uint8_t *buf, int buf_size)
504{
505 int i;
506 uint32_t state = -1;
f8a4d5e9
LB
507 int has_sps = 0;
508
509 for (i = 0; i <= buf_size; i++) {
510 if ((state & 0xFFFFFF1F) == 0x107)
511 has_sps = 1;
512 /* if((state&0xFFFFFF1F) == 0x101 ||
513 * (state&0xFFFFFF1F) == 0x102 ||
514 * (state&0xFFFFFF1F) == 0x105) {
515 * }
516 */
1b667269
JS
517 if ((state & 0xFFFFFF00) == 0x100 && (state & 0xFFFFFF1F) != 0x106 &&
518 (state & 0xFFFFFF1F) != 0x107 && (state & 0xFFFFFF1F) != 0x108 &&
519 (state & 0xFFFFFF1F) != 0x109 && (state & 0xFFFFFF1F) != 0x10d &&
520 (state & 0xFFFFFF1F) != 0x10f) {
f8a4d5e9
LB
521 if (has_sps) {
522 while (i > 4 && buf[i - 5] == 0)
523 i--;
524 return i - 4;
26b4fe82
AJ
525 }
526 }
f8a4d5e9
LB
527 if (i < buf_size)
528 state = (state << 8) | buf[i];
26b4fe82
AJ
529 }
530 return 0;
531}
532
dd990075 533static void close(AVCodecParserContext *s)
3ee4f5e4 534{
9404a47a
AK
535 H264ParseContext *p = s->priv_data;
536 H264Context *h = &p->h;
537 ParseContext *pc = &p->pc;
3ee4f5e4
MN
538
539 av_free(pc->buffer);
15861962 540 ff_h264_free_context(h);
3ee4f5e4
MN
541}
542
6fee1b90 543static av_cold int init(AVCodecParserContext *s)
e9ca315d 544{
9404a47a
AK
545 H264ParseContext *p = s->priv_data;
546 H264Context *h = &p->h;
92c6c2a6
AK
547
548 h->slice_ctx = av_mallocz(sizeof(*h->slice_ctx));
549 if (!h->slice_ctx)
550 return 0;
551 h->nb_slice_ctx = 1;
552
f8a4d5e9 553 h->thread_context[0] = h;
2c541554 554 h->slice_context_count = 1;
7a82022e 555 ff_h264dsp_init(&h->h264dsp, 8, 1);
e9ca315d
RC
556 return 0;
557}
26b4fe82 558
d36beb3f 559AVCodecParser ff_h264_parser = {
36ef5369 560 .codec_ids = { AV_CODEC_ID_H264 },
9404a47a 561 .priv_data_size = sizeof(H264ParseContext),
5511ad14
AK
562 .parser_init = init,
563 .parser_parse = h264_parse,
564 .parser_close = close,
565 .split = h264_split,
26b4fe82 566};