h264_parse: make sure the ref count is zeroed on all failure paths
[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
02cd8bb9
DB
28#include <assert.h>
29#include <stdint.h>
30
31#include "libavutil/avutil.h"
32#include "libavutil/error.h"
33#include "libavutil/log.h"
34#include "libavutil/mem.h"
35#include "libavutil/pixfmt.h"
36
37#include "get_bits.h"
ff6474dd 38#include "golomb.h"
02cd8bb9
DB
39#include "h264.h"
40#include "h264data.h"
f1e93986 41#include "internal.h"
e0c16e4e 42#include "mpegutils.h"
02cd8bb9 43#include "parser.h"
26b4fe82 44
9404a47a
AK
45typedef struct H264ParseContext {
46 H264Context h;
47 ParseContext pc;
48 int got_first;
49} H264ParseContext;
26b4fe82 50
9404a47a
AK
51
52static int h264_find_frame_end(H264ParseContext *p, const uint8_t *buf,
f8a4d5e9 53 int buf_size)
26b4fe82 54{
9404a47a 55 H264Context *h = &p->h;
26b4fe82
AJ
56 int i;
57 uint32_t state;
9404a47a 58 ParseContext *pc = &p->pc;
26b4fe82 59// mb_addr= pc->mb_addr - 1;
f8a4d5e9
LB
60 state = pc->state;
61 if (state > 13)
62 state = 7;
26b4fe82 63
f8a4d5e9
LB
64 for (i = 0; i < buf_size; i++) {
65 if (state == 7) {
db7f1c7c 66 i += h->h264dsp.startcode_find_candidate(buf + i, buf_size - i);
218d6844
BA
67 if (i < buf_size)
68 state = 2;
f8a4d5e9
LB
69 } else if (state <= 2) {
70 if (buf[i] == 1)
71 state ^= 5; // 2->7, 1->4, 0->5
72 else if (buf[i])
73 state = 7;
74 else
75 state >>= 1; // 2->1, 1->0, 0->0
76 } else if (state <= 5) {
dc971acf
VG
77 int nalu_type = buf[i] & 0x1F;
78 if (nalu_type == NAL_SEI || nalu_type == NAL_SPS ||
79 nalu_type == NAL_PPS || nalu_type == NAL_AUD) {
f8a4d5e9 80 if (pc->frame_start_found) {
26b4fe82 81 i++;
9aa1cfec 82 goto found;
26b4fe82 83 }
dc971acf
VG
84 } else if (nalu_type == NAL_SLICE || nalu_type == NAL_DPA ||
85 nalu_type == NAL_IDR_SLICE) {
f8a4d5e9
LB
86 if (pc->frame_start_found) {
87 state += 8;
26b4fe82 88 continue;
f8a4d5e9 89 } else
26b4fe82
AJ
90 pc->frame_start_found = 1;
91 }
f8a4d5e9
LB
92 state = 7;
93 } else {
58ae8d59 94 // first_mb_in_slice is 0, probably the first nal of a new slice
f8a4d5e9 95 if (buf[i] & 0x80)
26b4fe82 96 goto found;
f8a4d5e9 97 state = 7;
26b4fe82
AJ
98 }
99 }
f8a4d5e9 100 pc->state = state;
26b4fe82 101 return END_NOT_FOUND;
9aa1cfec
DP
102
103found:
f8a4d5e9
LB
104 pc->state = 7;
105 pc->frame_start_found = 0;
106 return i - (state & 5);
26b4fe82
AJ
107}
108
4baba6c8
YN
109static int scan_mmco_reset(AVCodecParserContext *s)
110{
9404a47a
AK
111 H264ParseContext *p = s->priv_data;
112 H264Context *h = &p->h;
92c6c2a6 113 H264SliceContext *sl = &h->slice_ctx[0];
a6e27f7a 114 int list_count, ref_count[2];
4baba6c8 115
56febc99 116 sl->slice_type_nos = s->pict_type & 3;
4baba6c8
YN
117
118 if (h->pps.redundant_pic_cnt_present)
f42485db 119 get_ue_golomb(&sl->gb); // redundant_pic_count
4baba6c8 120
e9f88441
AK
121 if (sl->slice_type_nos == AV_PICTURE_TYPE_B)
122 get_bits1(&sl->gb); // direct_spatial_mv_pred
123
a6e27f7a
AK
124 if (ff_h264_parse_ref_count(&list_count, ref_count, &sl->gb, &h->pps,
125 sl->slice_type_nos, h->picture_structure) < 0)
4baba6c8
YN
126 return AVERROR_INVALIDDATA;
127
56febc99 128 if (sl->slice_type_nos != AV_PICTURE_TYPE_I) {
4baba6c8 129 int list;
a6e27f7a 130 for (list = 0; list < list_count; list++) {
f42485db 131 if (get_bits1(&sl->gb)) {
4baba6c8
YN
132 int index;
133 for (index = 0; ; index++) {
f42485db 134 unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(&sl->gb);
4baba6c8
YN
135
136 if (reordering_of_pic_nums_idc < 3)
f42485db 137 get_ue_golomb(&sl->gb);
4baba6c8
YN
138 else if (reordering_of_pic_nums_idc > 3) {
139 av_log(h->avctx, AV_LOG_ERROR,
140 "illegal reordering_of_pic_nums_idc %d\n",
141 reordering_of_pic_nums_idc);
142 return AVERROR_INVALIDDATA;
143 } else
144 break;
145
a6e27f7a 146 if (index >= ref_count[list]) {
73e8fab3
VG
147 av_log(h->avctx, AV_LOG_ERROR,
148 "reference count %d overflow\n", index);
4baba6c8
YN
149 return AVERROR_INVALIDDATA;
150 }
151 }
152 }
153 }
154 }
155
56febc99
AK
156 if ((h->pps.weighted_pred && sl->slice_type_nos == AV_PICTURE_TYPE_P) ||
157 (h->pps.weighted_bipred_idc == 1 && sl->slice_type_nos == AV_PICTURE_TYPE_B))
a6e27f7a 158 ff_h264_pred_weight_table(&sl->gb, &h->sps, ref_count, sl->slice_type_nos,
e481458b 159 &sl->pwt);
4baba6c8 160
f42485db 161 if (get_bits1(&sl->gb)) { // adaptive_ref_pic_marking_mode_flag
4baba6c8
YN
162 int i;
163 for (i = 0; i < MAX_MMCO_COUNT; i++) {
f42485db 164 MMCOOpcode opcode = get_ue_golomb_31(&sl->gb);
4baba6c8
YN
165 if (opcode > (unsigned) MMCO_LONG) {
166 av_log(h->avctx, AV_LOG_ERROR,
167 "illegal memory management control operation %d\n",
168 opcode);
169 return AVERROR_INVALIDDATA;
170 }
171 if (opcode == MMCO_END)
172 return 0;
173 else if (opcode == MMCO_RESET)
174 return 1;
175
176 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
f42485db 177 get_ue_golomb(&sl->gb);
4baba6c8
YN
178 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
179 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
f42485db 180 get_ue_golomb_31(&sl->gb);
4baba6c8
YN
181 }
182 }
183
184 return 0;
185}
186
adbfc605 187/**
ff6474dd
IS
188 * Parse NAL units of found picture and decode some basic information.
189 *
190 * @param s parser context.
191 * @param avctx codec context.
192 * @param buf buffer with field/frame data.
193 * @param buf_size size of the buffer.
194 */
195static inline int parse_nal_units(AVCodecParserContext *s,
196 AVCodecContext *avctx,
197 const uint8_t *buf, int buf_size)
198{
9404a47a
AK
199 H264ParseContext *p = s->priv_data;
200 H264Context *h = &p->h;
f42485db 201 H264SliceContext *sl = &h->slice_ctx[0];
ff6474dd 202 const uint8_t *buf_end = buf + buf_size;
8d0cc8ca
AK
203
204 H2645NAL nal = { NULL };
205
96c3da93 206 unsigned int pps_id;
ff6474dd 207 unsigned int slice_type;
4baba6c8 208 int state = -1, got_reset = 0;
3f1a7ceb 209 int field_poc[2];
8d0cc8ca 210 int ret;
ff6474dd
IS
211
212 /* set some sane default values */
f8a4d5e9
LB
213 s->pict_type = AV_PICTURE_TYPE_I;
214 s->key_frame = 0;
3f1a7ceb 215 s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
ff6474dd 216
103d073d
YN
217 h->avctx = avctx;
218 ff_h264_reset_sei(h);
ff6474dd 219
9479415e
BC
220 if (!buf_size)
221 return 0;
222
f8a4d5e9 223 for (;;) {
8d0cc8ca 224 int src_length, consumed;
f1e93986 225 buf = avpriv_find_start_code(buf, buf_end, &state);
f8a4d5e9 226 if (buf >= buf_end)
ff6474dd
IS
227 break;
228 --buf;
229 src_length = buf_end - buf;
230 switch (state & 0x1f) {
231 case NAL_SLICE:
232 case NAL_IDR_SLICE:
233 // Do not walk the whole buffer just to decode slice header
19f53840 234 if ((state & 0x1f) == NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
4baba6c8
YN
235 /* IDR or disposable slice
236 * No need to decode many bytes because MMCOs shall not be present. */
237 if (src_length > 60)
238 src_length = 60;
239 } else {
240 /* To decode up to MMCOs */
241 if (src_length > 1000)
242 src_length = 1000;
243 }
ff6474dd
IS
244 break;
245 }
8d0cc8ca
AK
246
247 consumed = ff_h2645_extract_rbsp(buf, src_length, &nal);
248 if (consumed < 0)
ff6474dd
IS
249 break;
250
8d0cc8ca
AK
251 ret = init_get_bits(&nal.gb, nal.data, nal.size * 8);
252 if (ret < 0)
253 goto fail;
254 get_bits1(&nal.gb);
255 nal.ref_idc = get_bits(&nal.gb, 2);
256 nal.type = get_bits(&nal.gb, 5);
257
258 h->gb = nal.gb;
259 h->nal_ref_idc = nal.ref_idc;
260 h->nal_unit_type = nal.type;
261
f8a4d5e9 262 switch (h->nal_unit_type) {
ff6474dd
IS
263 case NAL_SPS:
264 ff_h264_decode_seq_parameter_set(h);
265 break;
266 case NAL_PPS:
2c541554 267 ff_h264_decode_picture_parameter_set(h, h->gb.size_in_bits);
ff6474dd
IS
268 break;
269 case NAL_SEI:
270 ff_h264_decode_sei(h);
271 break;
272 case NAL_IDR_SLICE:
0ed260c7 273 s->key_frame = 1;
3f1a7ceb
YN
274
275 h->prev_frame_num = 0;
276 h->prev_frame_num_offset = 0;
277 h->prev_poc_msb =
278 h->prev_poc_lsb = 0;
f8a4d5e9 279 /* fall through */
ff6474dd 280 case NAL_SLICE:
8d0cc8ca 281 sl->gb = nal.gb;
f42485db
AK
282 get_ue_golomb(&sl->gb); // skip first_mb_in_slice
283 slice_type = get_ue_golomb_31(&sl->gb);
a7da517f 284 s->pict_type = ff_h264_golomb_to_pict_type[slice_type % 5];
0ed260c7
IS
285 if (h->sei_recovery_frame_cnt >= 0) {
286 /* key frame, since recovery_frame_cnt is set */
287 s->key_frame = 1;
288 }
f42485db 289 pps_id = get_ue_golomb(&sl->gb);
f8a4d5e9
LB
290 if (pps_id >= MAX_PPS_COUNT) {
291 av_log(h->avctx, AV_LOG_ERROR,
73e8fab3 292 "pps_id %u out of range\n", pps_id);
8d0cc8ca 293 goto fail;
96c3da93 294 }
f8a4d5e9
LB
295 if (!h->pps_buffers[pps_id]) {
296 av_log(h->avctx, AV_LOG_ERROR,
73e8fab3 297 "non-existing PPS %u referenced\n", pps_id);
8d0cc8ca 298 goto fail;
96c3da93 299 }
f8a4d5e9
LB
300 h->pps = *h->pps_buffers[pps_id];
301 if (!h->sps_buffers[h->pps.sps_id]) {
302 av_log(h->avctx, AV_LOG_ERROR,
73e8fab3 303 "non-existing SPS %u referenced\n", h->pps.sps_id);
8d0cc8ca 304 goto fail;
96c3da93 305 }
f8a4d5e9 306 h->sps = *h->sps_buffers[h->pps.sps_id];
f42485db 307 h->frame_num = get_bits(&sl->gb, h->sps.log2_max_frame_num);
96c3da93 308
31d2039c
AK
309 s->coded_width = 16 * h->sps.mb_width;
310 s->coded_height = 16 * h->sps.mb_height;
311 s->width = s->coded_width - (h->sps.crop_right + h->sps.crop_left);
312 s->height = s->coded_height - (h->sps.crop_top + h->sps.crop_bottom);
313 if (s->width <= 0 || s->height <= 0) {
314 s->width = s->coded_width;
315 s->height = s->coded_height;
316 }
317
318 switch (h->sps.bit_depth_luma) {
319 case 9:
320 if (CHROMA444(h)) s->format = AV_PIX_FMT_YUV444P9;
321 else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P9;
322 else s->format = AV_PIX_FMT_YUV420P9;
323 break;
324 case 10:
325 if (CHROMA444(h)) s->format = AV_PIX_FMT_YUV444P10;
326 else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P10;
327 else s->format = AV_PIX_FMT_YUV420P10;
328 break;
329 case 8:
330 if (CHROMA444(h)) s->format = AV_PIX_FMT_YUV444P;
331 else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P;
332 else s->format = AV_PIX_FMT_YUV420P;
333 break;
334 default:
335 s->format = AV_PIX_FMT_NONE;
336 }
337
fe9a3fbe 338 avctx->profile = ff_h264_get_profile(&h->sps);
dd0cd3d2
RC
339 avctx->level = h->sps.level_idc;
340
f8a4d5e9
LB
341 if (h->sps.frame_mbs_only_flag) {
342 h->picture_structure = PICT_FRAME;
343 } else {
f42485db
AK
344 if (get_bits1(&sl->gb)) { // field_pic_flag
345 h->picture_structure = PICT_TOP_FIELD + get_bits1(&sl->gb); // bottom_field_flag
96c3da93 346 } else {
f8a4d5e9 347 h->picture_structure = PICT_FRAME;
96c3da93
IS
348 }
349 }
350
3f1a7ceb 351 if (h->nal_unit_type == NAL_IDR_SLICE)
f42485db 352 get_ue_golomb(&sl->gb); /* idr_pic_id */
3f1a7ceb 353 if (h->sps.poc_type == 0) {
f42485db 354 h->poc_lsb = get_bits(&sl->gb, h->sps.log2_max_poc_lsb);
3f1a7ceb 355
f8a4d5e9
LB
356 if (h->pps.pic_order_present == 1 &&
357 h->picture_structure == PICT_FRAME)
f42485db 358 h->delta_poc_bottom = get_se_golomb(&sl->gb);
3f1a7ceb
YN
359 }
360
f8a4d5e9
LB
361 if (h->sps.poc_type == 1 &&
362 !h->sps.delta_pic_order_always_zero_flag) {
f42485db 363 h->delta_poc[0] = get_se_golomb(&sl->gb);
3f1a7ceb 364
f8a4d5e9
LB
365 if (h->pps.pic_order_present == 1 &&
366 h->picture_structure == PICT_FRAME)
f42485db 367 h->delta_poc[1] = get_se_golomb(&sl->gb);
3f1a7ceb
YN
368 }
369
4baba6c8
YN
370 /* Decode POC of this picture.
371 * The prev_ values needed for decoding POC of the next picture are not set here. */
b81dbd6c 372 field_poc[0] = field_poc[1] = INT_MAX;
a8b19271 373 ff_init_poc(h, field_poc, &s->output_picture_number);
3f1a7ceb 374
4baba6c8
YN
375 /* Continue parsing to check if MMCO_RESET is present.
376 * FIXME: MMCO_RESET could appear in non-first slice.
377 * Maybe, we should parse all undisposable non-IDR slice of this
378 * picture until encountering MMCO_RESET in a slice of it. */
379 if (h->nal_ref_idc && h->nal_unit_type != NAL_IDR_SLICE) {
380 got_reset = scan_mmco_reset(s);
381 if (got_reset < 0)
8d0cc8ca 382 goto fail;
4baba6c8
YN
383 }
384
b81dbd6c 385 /* Set up the prev_ values for decoding POC of the next picture. */
4baba6c8
YN
386 h->prev_frame_num = got_reset ? 0 : h->frame_num;
387 h->prev_frame_num_offset = got_reset ? 0 : h->frame_num_offset;
b81dbd6c 388 if (h->nal_ref_idc != 0) {
4baba6c8
YN
389 if (!got_reset) {
390 h->prev_poc_msb = h->poc_msb;
391 h->prev_poc_lsb = h->poc_lsb;
392 } else {
393 h->prev_poc_msb = 0;
394 h->prev_poc_lsb =
395 h->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
396 }
b81dbd6c
YN
397 }
398
f8a4d5e9 399 if (h->sps.pic_struct_present_flag) {
346db3ef 400 switch (h->sei_pic_struct) {
f8a4d5e9
LB
401 case SEI_PIC_STRUCT_TOP_FIELD:
402 case SEI_PIC_STRUCT_BOTTOM_FIELD:
403 s->repeat_pict = 0;
404 break;
405 case SEI_PIC_STRUCT_FRAME:
406 case SEI_PIC_STRUCT_TOP_BOTTOM:
407 case SEI_PIC_STRUCT_BOTTOM_TOP:
408 s->repeat_pict = 1;
409 break;
410 case SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
411 case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
412 s->repeat_pict = 2;
413 break;
414 case SEI_PIC_STRUCT_FRAME_DOUBLING:
415 s->repeat_pict = 3;
416 break;
417 case SEI_PIC_STRUCT_FRAME_TRIPLING:
418 s->repeat_pict = 5;
419 break;
420 default:
421 s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
422 break;
346db3ef
IS
423 }
424 } else {
2c541554 425 s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
346db3ef
IS
426 }
427
3f1a7ceb
YN
428 if (h->picture_structure == PICT_FRAME) {
429 s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
430 if (h->sps.pic_struct_present_flag) {
431 switch (h->sei_pic_struct) {
f8a4d5e9
LB
432 case SEI_PIC_STRUCT_TOP_BOTTOM:
433 case SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
434 s->field_order = AV_FIELD_TT;
435 break;
436 case SEI_PIC_STRUCT_BOTTOM_TOP:
437 case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
438 s->field_order = AV_FIELD_BB;
439 break;
440 default:
441 s->field_order = AV_FIELD_PROGRESSIVE;
442 break;
3f1a7ceb
YN
443 }
444 } else {
445 if (field_poc[0] < field_poc[1])
446 s->field_order = AV_FIELD_TT;
447 else if (field_poc[0] > field_poc[1])
448 s->field_order = AV_FIELD_BB;
449 else
450 s->field_order = AV_FIELD_PROGRESSIVE;
451 }
452 } else {
453 if (h->picture_structure == PICT_TOP_FIELD)
454 s->picture_structure = AV_PICTURE_STRUCTURE_TOP_FIELD;
455 else
456 s->picture_structure = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
457 s->field_order = AV_FIELD_UNKNOWN;
458 }
459
8d0cc8ca 460 av_freep(&nal.rbsp_buffer);
ff6474dd
IS
461 return 0; /* no need to evaluate the rest */
462 }
463 buf += consumed;
464 }
465 /* didn't find a picture! */
2c541554 466 av_log(h->avctx, AV_LOG_ERROR, "missing picture in access unit\n");
8d0cc8ca
AK
467fail:
468 av_freep(&nal.rbsp_buffer);
ff6474dd
IS
469 return -1;
470}
471
26b4fe82
AJ
472static int h264_parse(AVCodecParserContext *s,
473 AVCodecContext *avctx,
474 const uint8_t **poutbuf, int *poutbuf_size,
475 const uint8_t *buf, int buf_size)
476{
9404a47a
AK
477 H264ParseContext *p = s->priv_data;
478 H264Context *h = &p->h;
479 ParseContext *pc = &p->pc;
26b4fe82
AJ
480 int next;
481
9404a47a
AK
482 if (!p->got_first) {
483 p->got_first = 1;
23584bec 484 if (avctx->extradata_size) {
2c541554 485 h->avctx = avctx;
790a367d
RT
486 // must be done like in the decoder.
487 // otherwise opening the parser, creating extradata,
488 // and then closing and opening again
489 // will cause has_b_frames to be always set.
490 // NB: estimate_timings_from_pts behaves exactly like this.
491 if (!avctx->has_b_frames)
2c541554 492 h->low_delay = 1;
23584bec
HC
493 ff_h264_decode_extradata(h);
494 }
495 }
496
f8a4d5e9
LB
497 if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
498 next = buf_size;
499 } else {
9404a47a 500 next = h264_find_frame_end(p, buf, buf_size);
26b4fe82
AJ
501
502 if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
f8a4d5e9 503 *poutbuf = NULL;
26b4fe82
AJ
504 *poutbuf_size = 0;
505 return buf_size;
506 }
507
f8a4d5e9
LB
508 if (next < 0 && next != END_NOT_FOUND) {
509 assert(pc->last_index + next >= 0);
9404a47a 510 h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next); // update state
26b4fe82 511 }
a26ce1e2 512 }
ff6474dd 513
25f05ddb 514 parse_nal_units(s, avctx, buf, buf_size);
c733922e 515
25f05ddb
PL
516 if (h->sei_cpb_removal_delay >= 0) {
517 s->dts_sync_point = h->sei_buffering_period_present;
518 s->dts_ref_dts_delta = h->sei_cpb_removal_delay;
519 s->pts_dts_delta = h->sei_dpb_output_delay;
520 } else {
521 s->dts_sync_point = INT_MIN;
522 s->dts_ref_dts_delta = INT_MIN;
523 s->pts_dts_delta = INT_MIN;
524 }
525
526 if (s->flags & PARSER_FLAG_ONCE) {
527 s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
528 }
26b4fe82 529
f8a4d5e9 530 *poutbuf = buf;
26b4fe82
AJ
531 *poutbuf_size = buf_size;
532 return next;
533}
534
535static int h264_split(AVCodecContext *avctx,
536 const uint8_t *buf, int buf_size)
537{
538 int i;
539 uint32_t state = -1;
f8a4d5e9
LB
540 int has_sps = 0;
541
542 for (i = 0; i <= buf_size; i++) {
543 if ((state & 0xFFFFFF1F) == 0x107)
544 has_sps = 1;
545 /* if((state&0xFFFFFF1F) == 0x101 ||
546 * (state&0xFFFFFF1F) == 0x102 ||
547 * (state&0xFFFFFF1F) == 0x105) {
548 * }
549 */
1b667269
JS
550 if ((state & 0xFFFFFF00) == 0x100 && (state & 0xFFFFFF1F) != 0x106 &&
551 (state & 0xFFFFFF1F) != 0x107 && (state & 0xFFFFFF1F) != 0x108 &&
552 (state & 0xFFFFFF1F) != 0x109 && (state & 0xFFFFFF1F) != 0x10d &&
553 (state & 0xFFFFFF1F) != 0x10f) {
f8a4d5e9
LB
554 if (has_sps) {
555 while (i > 4 && buf[i - 5] == 0)
556 i--;
557 return i - 4;
26b4fe82
AJ
558 }
559 }
f8a4d5e9
LB
560 if (i < buf_size)
561 state = (state << 8) | buf[i];
26b4fe82
AJ
562 }
563 return 0;
564}
565
8161220e 566static void h264_close(AVCodecParserContext *s)
3ee4f5e4 567{
9404a47a
AK
568 H264ParseContext *p = s->priv_data;
569 H264Context *h = &p->h;
570 ParseContext *pc = &p->pc;
3ee4f5e4
MN
571
572 av_free(pc->buffer);
15861962 573 ff_h264_free_context(h);
3ee4f5e4
MN
574}
575
6fee1b90 576static av_cold int init(AVCodecParserContext *s)
e9ca315d 577{
9404a47a
AK
578 H264ParseContext *p = s->priv_data;
579 H264Context *h = &p->h;
92c6c2a6
AK
580
581 h->slice_ctx = av_mallocz(sizeof(*h->slice_ctx));
582 if (!h->slice_ctx)
583 return 0;
584 h->nb_slice_ctx = 1;
585
2c541554 586 h->slice_context_count = 1;
7a82022e 587 ff_h264dsp_init(&h->h264dsp, 8, 1);
e9ca315d
RC
588 return 0;
589}
26b4fe82 590
d36beb3f 591AVCodecParser ff_h264_parser = {
36ef5369 592 .codec_ids = { AV_CODEC_ID_H264 },
9404a47a 593 .priv_data_size = sizeof(H264ParseContext),
5511ad14
AK
594 .parser_init = init,
595 .parser_parse = h264_parse,
8161220e 596 .parser_close = h264_close,
5511ad14 597 .split = h264_split,
26b4fe82 598};