h264_parser: Rename close() to h264_close()
[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)
f42485db 110 get_ue_golomb(&sl->gb); // redundant_pic_count
4baba6c8 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++) {
f42485db 118 if (get_bits1(&sl->gb)) {
4baba6c8
YN
119 int index;
120 for (index = 0; ; index++) {
f42485db 121 unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(&sl->gb);
4baba6c8
YN
122
123 if (reordering_of_pic_nums_idc < 3)
f42485db 124 get_ue_golomb(&sl->gb);
4baba6c8
YN
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 146
f42485db 147 if (get_bits1(&sl->gb)) { // adaptive_ref_pic_marking_mode_flag
4baba6c8
YN
148 int i;
149 for (i = 0; i < MAX_MMCO_COUNT; i++) {
f42485db 150 MMCOOpcode opcode = get_ue_golomb_31(&sl->gb);
4baba6c8
YN
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)
f42485db 163 get_ue_golomb(&sl->gb);
4baba6c8
YN
164 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
165 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
f42485db 166 get_ue_golomb_31(&sl->gb);
4baba6c8
YN
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;
f42485db 187 H264SliceContext *sl = &h->slice_ctx[0];
ff6474dd 188 const uint8_t *buf_end = buf + buf_size;
96c3da93 189 unsigned int pps_id;
ff6474dd 190 unsigned int slice_type;
4baba6c8 191 int state = -1, got_reset = 0;
ff6474dd 192 const uint8_t *ptr;
3f1a7ceb 193 int field_poc[2];
ff6474dd
IS
194
195 /* set some sane default values */
f8a4d5e9
LB
196 s->pict_type = AV_PICTURE_TYPE_I;
197 s->key_frame = 0;
3f1a7ceb 198 s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
ff6474dd 199
103d073d
YN
200 h->avctx = avctx;
201 ff_h264_reset_sei(h);
ff6474dd 202
9479415e
BC
203 if (!buf_size)
204 return 0;
205
f8a4d5e9 206 for (;;) {
ff6474dd 207 int src_length, dst_length, consumed;
f1e93986 208 buf = avpriv_find_start_code(buf, buf_end, &state);
f8a4d5e9 209 if (buf >= buf_end)
ff6474dd
IS
210 break;
211 --buf;
212 src_length = buf_end - buf;
213 switch (state & 0x1f) {
214 case NAL_SLICE:
215 case NAL_IDR_SLICE:
216 // Do not walk the whole buffer just to decode slice header
19f53840 217 if ((state & 0x1f) == NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
4baba6c8
YN
218 /* IDR or disposable slice
219 * No need to decode many bytes because MMCOs shall not be present. */
220 if (src_length > 60)
221 src_length = 60;
222 } else {
223 /* To decode up to MMCOs */
224 if (src_length > 1000)
225 src_length = 1000;
226 }
ff6474dd
IS
227 break;
228 }
3178f4d3 229 ptr = ff_h264_decode_nal(h, sl, buf, &dst_length, &consumed, src_length);
f929ab05 230 if (!ptr || dst_length < 0)
ff6474dd
IS
231 break;
232
f8a4d5e9
LB
233 init_get_bits(&h->gb, ptr, 8 * dst_length);
234 switch (h->nal_unit_type) {
ff6474dd
IS
235 case NAL_SPS:
236 ff_h264_decode_seq_parameter_set(h);
237 break;
238 case NAL_PPS:
2c541554 239 ff_h264_decode_picture_parameter_set(h, h->gb.size_in_bits);
ff6474dd
IS
240 break;
241 case NAL_SEI:
242 ff_h264_decode_sei(h);
243 break;
244 case NAL_IDR_SLICE:
0ed260c7 245 s->key_frame = 1;
3f1a7ceb
YN
246
247 h->prev_frame_num = 0;
248 h->prev_frame_num_offset = 0;
249 h->prev_poc_msb =
250 h->prev_poc_lsb = 0;
f8a4d5e9 251 /* fall through */
ff6474dd 252 case NAL_SLICE:
f42485db
AK
253 init_get_bits(&sl->gb, ptr, 8 * dst_length);
254 get_ue_golomb(&sl->gb); // skip first_mb_in_slice
255 slice_type = get_ue_golomb_31(&sl->gb);
ff6474dd 256 s->pict_type = golomb_to_pict_type[slice_type % 5];
0ed260c7
IS
257 if (h->sei_recovery_frame_cnt >= 0) {
258 /* key frame, since recovery_frame_cnt is set */
259 s->key_frame = 1;
260 }
f42485db 261 pps_id = get_ue_golomb(&sl->gb);
f8a4d5e9
LB
262 if (pps_id >= MAX_PPS_COUNT) {
263 av_log(h->avctx, AV_LOG_ERROR,
73e8fab3 264 "pps_id %u out of range\n", pps_id);
96c3da93
IS
265 return -1;
266 }
f8a4d5e9
LB
267 if (!h->pps_buffers[pps_id]) {
268 av_log(h->avctx, AV_LOG_ERROR,
73e8fab3 269 "non-existing PPS %u referenced\n", pps_id);
96c3da93
IS
270 return -1;
271 }
f8a4d5e9
LB
272 h->pps = *h->pps_buffers[pps_id];
273 if (!h->sps_buffers[h->pps.sps_id]) {
274 av_log(h->avctx, AV_LOG_ERROR,
73e8fab3 275 "non-existing SPS %u referenced\n", h->pps.sps_id);
96c3da93
IS
276 return -1;
277 }
f8a4d5e9 278 h->sps = *h->sps_buffers[h->pps.sps_id];
f42485db 279 h->frame_num = get_bits(&sl->gb, h->sps.log2_max_frame_num);
96c3da93 280
31d2039c
AK
281 s->coded_width = 16 * h->sps.mb_width;
282 s->coded_height = 16 * h->sps.mb_height;
283 s->width = s->coded_width - (h->sps.crop_right + h->sps.crop_left);
284 s->height = s->coded_height - (h->sps.crop_top + h->sps.crop_bottom);
285 if (s->width <= 0 || s->height <= 0) {
286 s->width = s->coded_width;
287 s->height = s->coded_height;
288 }
289
290 switch (h->sps.bit_depth_luma) {
291 case 9:
292 if (CHROMA444(h)) s->format = AV_PIX_FMT_YUV444P9;
293 else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P9;
294 else s->format = AV_PIX_FMT_YUV420P9;
295 break;
296 case 10:
297 if (CHROMA444(h)) s->format = AV_PIX_FMT_YUV444P10;
298 else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P10;
299 else s->format = AV_PIX_FMT_YUV420P10;
300 break;
301 case 8:
302 if (CHROMA444(h)) s->format = AV_PIX_FMT_YUV444P;
303 else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P;
304 else s->format = AV_PIX_FMT_YUV420P;
305 break;
306 default:
307 s->format = AV_PIX_FMT_NONE;
308 }
309
fe9a3fbe 310 avctx->profile = ff_h264_get_profile(&h->sps);
dd0cd3d2
RC
311 avctx->level = h->sps.level_idc;
312
f8a4d5e9
LB
313 if (h->sps.frame_mbs_only_flag) {
314 h->picture_structure = PICT_FRAME;
315 } else {
f42485db
AK
316 if (get_bits1(&sl->gb)) { // field_pic_flag
317 h->picture_structure = PICT_TOP_FIELD + get_bits1(&sl->gb); // bottom_field_flag
96c3da93 318 } else {
f8a4d5e9 319 h->picture_structure = PICT_FRAME;
96c3da93
IS
320 }
321 }
322
3f1a7ceb 323 if (h->nal_unit_type == NAL_IDR_SLICE)
f42485db 324 get_ue_golomb(&sl->gb); /* idr_pic_id */
3f1a7ceb 325 if (h->sps.poc_type == 0) {
f42485db 326 h->poc_lsb = get_bits(&sl->gb, h->sps.log2_max_poc_lsb);
3f1a7ceb 327
f8a4d5e9
LB
328 if (h->pps.pic_order_present == 1 &&
329 h->picture_structure == PICT_FRAME)
f42485db 330 h->delta_poc_bottom = get_se_golomb(&sl->gb);
3f1a7ceb
YN
331 }
332
f8a4d5e9
LB
333 if (h->sps.poc_type == 1 &&
334 !h->sps.delta_pic_order_always_zero_flag) {
f42485db 335 h->delta_poc[0] = get_se_golomb(&sl->gb);
3f1a7ceb 336
f8a4d5e9
LB
337 if (h->pps.pic_order_present == 1 &&
338 h->picture_structure == PICT_FRAME)
f42485db 339 h->delta_poc[1] = get_se_golomb(&sl->gb);
3f1a7ceb
YN
340 }
341
4baba6c8
YN
342 /* Decode POC of this picture.
343 * The prev_ values needed for decoding POC of the next picture are not set here. */
b81dbd6c 344 field_poc[0] = field_poc[1] = INT_MAX;
a8b19271 345 ff_init_poc(h, field_poc, &s->output_picture_number);
3f1a7ceb 346
4baba6c8
YN
347 /* Continue parsing to check if MMCO_RESET is present.
348 * FIXME: MMCO_RESET could appear in non-first slice.
349 * Maybe, we should parse all undisposable non-IDR slice of this
350 * picture until encountering MMCO_RESET in a slice of it. */
351 if (h->nal_ref_idc && h->nal_unit_type != NAL_IDR_SLICE) {
352 got_reset = scan_mmco_reset(s);
353 if (got_reset < 0)
354 return got_reset;
355 }
356
b81dbd6c 357 /* Set up the prev_ values for decoding POC of the next picture. */
4baba6c8
YN
358 h->prev_frame_num = got_reset ? 0 : h->frame_num;
359 h->prev_frame_num_offset = got_reset ? 0 : h->frame_num_offset;
b81dbd6c 360 if (h->nal_ref_idc != 0) {
4baba6c8
YN
361 if (!got_reset) {
362 h->prev_poc_msb = h->poc_msb;
363 h->prev_poc_lsb = h->poc_lsb;
364 } else {
365 h->prev_poc_msb = 0;
366 h->prev_poc_lsb =
367 h->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
368 }
b81dbd6c
YN
369 }
370
f8a4d5e9 371 if (h->sps.pic_struct_present_flag) {
346db3ef 372 switch (h->sei_pic_struct) {
f8a4d5e9
LB
373 case SEI_PIC_STRUCT_TOP_FIELD:
374 case SEI_PIC_STRUCT_BOTTOM_FIELD:
375 s->repeat_pict = 0;
376 break;
377 case SEI_PIC_STRUCT_FRAME:
378 case SEI_PIC_STRUCT_TOP_BOTTOM:
379 case SEI_PIC_STRUCT_BOTTOM_TOP:
380 s->repeat_pict = 1;
381 break;
382 case SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
383 case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
384 s->repeat_pict = 2;
385 break;
386 case SEI_PIC_STRUCT_FRAME_DOUBLING:
387 s->repeat_pict = 3;
388 break;
389 case SEI_PIC_STRUCT_FRAME_TRIPLING:
390 s->repeat_pict = 5;
391 break;
392 default:
393 s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
394 break;
346db3ef
IS
395 }
396 } else {
2c541554 397 s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
346db3ef
IS
398 }
399
3f1a7ceb
YN
400 if (h->picture_structure == PICT_FRAME) {
401 s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
402 if (h->sps.pic_struct_present_flag) {
403 switch (h->sei_pic_struct) {
f8a4d5e9
LB
404 case SEI_PIC_STRUCT_TOP_BOTTOM:
405 case SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
406 s->field_order = AV_FIELD_TT;
407 break;
408 case SEI_PIC_STRUCT_BOTTOM_TOP:
409 case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
410 s->field_order = AV_FIELD_BB;
411 break;
412 default:
413 s->field_order = AV_FIELD_PROGRESSIVE;
414 break;
3f1a7ceb
YN
415 }
416 } else {
417 if (field_poc[0] < field_poc[1])
418 s->field_order = AV_FIELD_TT;
419 else if (field_poc[0] > field_poc[1])
420 s->field_order = AV_FIELD_BB;
421 else
422 s->field_order = AV_FIELD_PROGRESSIVE;
423 }
424 } else {
425 if (h->picture_structure == PICT_TOP_FIELD)
426 s->picture_structure = AV_PICTURE_STRUCTURE_TOP_FIELD;
427 else
428 s->picture_structure = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
429 s->field_order = AV_FIELD_UNKNOWN;
430 }
431
ff6474dd
IS
432 return 0; /* no need to evaluate the rest */
433 }
434 buf += consumed;
435 }
436 /* didn't find a picture! */
2c541554 437 av_log(h->avctx, AV_LOG_ERROR, "missing picture in access unit\n");
ff6474dd
IS
438 return -1;
439}
440
26b4fe82
AJ
441static int h264_parse(AVCodecParserContext *s,
442 AVCodecContext *avctx,
443 const uint8_t **poutbuf, int *poutbuf_size,
444 const uint8_t *buf, int buf_size)
445{
9404a47a
AK
446 H264ParseContext *p = s->priv_data;
447 H264Context *h = &p->h;
448 ParseContext *pc = &p->pc;
26b4fe82
AJ
449 int next;
450
9404a47a
AK
451 if (!p->got_first) {
452 p->got_first = 1;
23584bec 453 if (avctx->extradata_size) {
2c541554 454 h->avctx = avctx;
790a367d
RT
455 // must be done like in the decoder.
456 // otherwise opening the parser, creating extradata,
457 // and then closing and opening again
458 // will cause has_b_frames to be always set.
459 // NB: estimate_timings_from_pts behaves exactly like this.
460 if (!avctx->has_b_frames)
2c541554 461 h->low_delay = 1;
23584bec
HC
462 ff_h264_decode_extradata(h);
463 }
464 }
465
f8a4d5e9
LB
466 if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
467 next = buf_size;
468 } else {
9404a47a 469 next = h264_find_frame_end(p, buf, buf_size);
26b4fe82
AJ
470
471 if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
f8a4d5e9 472 *poutbuf = NULL;
26b4fe82
AJ
473 *poutbuf_size = 0;
474 return buf_size;
475 }
476
f8a4d5e9
LB
477 if (next < 0 && next != END_NOT_FOUND) {
478 assert(pc->last_index + next >= 0);
9404a47a 479 h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next); // update state
26b4fe82 480 }
a26ce1e2 481 }
ff6474dd 482
25f05ddb 483 parse_nal_units(s, avctx, buf, buf_size);
c733922e 484
25f05ddb
PL
485 if (h->sei_cpb_removal_delay >= 0) {
486 s->dts_sync_point = h->sei_buffering_period_present;
487 s->dts_ref_dts_delta = h->sei_cpb_removal_delay;
488 s->pts_dts_delta = h->sei_dpb_output_delay;
489 } else {
490 s->dts_sync_point = INT_MIN;
491 s->dts_ref_dts_delta = INT_MIN;
492 s->pts_dts_delta = INT_MIN;
493 }
494
495 if (s->flags & PARSER_FLAG_ONCE) {
496 s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
497 }
26b4fe82 498
f8a4d5e9 499 *poutbuf = buf;
26b4fe82
AJ
500 *poutbuf_size = buf_size;
501 return next;
502}
503
504static int h264_split(AVCodecContext *avctx,
505 const uint8_t *buf, int buf_size)
506{
507 int i;
508 uint32_t state = -1;
f8a4d5e9
LB
509 int has_sps = 0;
510
511 for (i = 0; i <= buf_size; i++) {
512 if ((state & 0xFFFFFF1F) == 0x107)
513 has_sps = 1;
514 /* if((state&0xFFFFFF1F) == 0x101 ||
515 * (state&0xFFFFFF1F) == 0x102 ||
516 * (state&0xFFFFFF1F) == 0x105) {
517 * }
518 */
1b667269
JS
519 if ((state & 0xFFFFFF00) == 0x100 && (state & 0xFFFFFF1F) != 0x106 &&
520 (state & 0xFFFFFF1F) != 0x107 && (state & 0xFFFFFF1F) != 0x108 &&
521 (state & 0xFFFFFF1F) != 0x109 && (state & 0xFFFFFF1F) != 0x10d &&
522 (state & 0xFFFFFF1F) != 0x10f) {
f8a4d5e9
LB
523 if (has_sps) {
524 while (i > 4 && buf[i - 5] == 0)
525 i--;
526 return i - 4;
26b4fe82
AJ
527 }
528 }
f8a4d5e9
LB
529 if (i < buf_size)
530 state = (state << 8) | buf[i];
26b4fe82
AJ
531 }
532 return 0;
533}
534
8161220e 535static void h264_close(AVCodecParserContext *s)
3ee4f5e4 536{
9404a47a
AK
537 H264ParseContext *p = s->priv_data;
538 H264Context *h = &p->h;
539 ParseContext *pc = &p->pc;
3ee4f5e4
MN
540
541 av_free(pc->buffer);
15861962 542 ff_h264_free_context(h);
3ee4f5e4
MN
543}
544
6fee1b90 545static av_cold int init(AVCodecParserContext *s)
e9ca315d 546{
9404a47a
AK
547 H264ParseContext *p = s->priv_data;
548 H264Context *h = &p->h;
92c6c2a6
AK
549
550 h->slice_ctx = av_mallocz(sizeof(*h->slice_ctx));
551 if (!h->slice_ctx)
552 return 0;
553 h->nb_slice_ctx = 1;
554
2c541554 555 h->slice_context_count = 1;
7a82022e 556 ff_h264dsp_init(&h->h264dsp, 8, 1);
e9ca315d
RC
557 return 0;
558}
26b4fe82 559
d36beb3f 560AVCodecParser ff_h264_parser = {
36ef5369 561 .codec_ids = { AV_CODEC_ID_H264 },
9404a47a 562 .priv_data_size = sizeof(H264ParseContext),
5511ad14
AK
563 .parser_init = init,
564 .parser_parse = h264_parse,
8161220e 565 .parser_close = h264_close,
5511ad14 566 .split = h264_split,
26b4fe82 567};