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fix bit rate
[libav.git] / libavcodec / parser.c
CommitLineData
8424cf50
FB		 1/*
2 * Audio and Video frame extraction
3 * Copyright (c) 2003 Fabrice Bellard.
4 * Copyright (c) 2003 Michael Niedermayer.
5 *
b78e7197
DB		 6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
8424cf50
FB		 9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
b78e7197 11 * version 2.1 of the License, or (at your option) any later version.
8424cf50 12 *
b78e7197 13 * FFmpeg is distributed in the hope that it will be useful,
8424cf50
FB		 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
b78e7197 19 * License along with FFmpeg; if not, write to the Free Software
5509bffa 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
8424cf50
FB		 21 */
22#include "avcodec.h"
23#include "mpegvideo.h"
24#include "mpegaudio.h"
25
26AVCodecParser *av_first_parser = NULL;
27
28void av_register_codec_parser(AVCodecParser *parser)
29{
30 parser->next = av_first_parser;
31 av_first_parser = parser;
32}
33
34AVCodecParserContext *av_parser_init(int codec_id)
35{
36 AVCodecParserContext *s;
37 AVCodecParser *parser;
38 int ret;
115329f1 39
8845e427
MN		 40 if(codec_id == CODEC_ID_NONE)
41 return NULL;
8424cf50
FB		 42
43 for(parser = av_first_parser; parser != NULL; parser = parser->next) {
44 if (parser->codec_ids[0] == codec_id ||
45 parser->codec_ids[1] == codec_id ||
99f06236
MN		 46 parser->codec_ids[2] == codec_id ||
47 parser->codec_ids[3] == codec_id ||
48 parser->codec_ids[4] == codec_id)
8424cf50
FB		 49 goto found;
50 }
51 return NULL;
52 found:
53 s = av_mallocz(sizeof(AVCodecParserContext));
54 if (!s)
55 return NULL;
56 s->parser = parser;
57 s->priv_data = av_mallocz(parser->priv_data_size);
58 if (!s->priv_data) {
59 av_free(s);
60 return NULL;
61 }
62 if (parser->parser_init) {
63 ret = parser->parser_init(s);
64 if (ret != 0) {
65 av_free(s->priv_data);
66 av_free(s);
67 return NULL;
68 }
69 }
a62aecce 70 s->fetch_timestamp=1;
8424cf50
FB		 71 return s;
72}
73
6e45e928
FB		 74/* NOTE: buf_size == 0 is used to signal EOF so that the last frame
75 can be returned if necessary */
115329f1 76int av_parser_parse(AVCodecParserContext *s,
8424cf50 77 AVCodecContext *avctx,
115329f1 78 uint8_t **poutbuf, int *poutbuf_size,
b84f2a35
FB		 79 const uint8_t *buf, int buf_size,
80 int64_t pts, int64_t dts)
8424cf50 81{
b84f2a35 82 int index, i, k;
6e45e928 83 uint8_t dummy_buf[FF_INPUT_BUFFER_PADDING_SIZE];
115329f1 84
6e45e928
FB		 85 if (buf_size == 0) {
86 /* padding is always necessary even if EOF, so we add it here */
87 memset(dummy_buf, 0, sizeof(dummy_buf));
88 buf = dummy_buf;
b84f2a35
FB		 89 } else {
90 /* add a new packet descriptor */
91 k = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
92 s->cur_frame_start_index = k;
93 s->cur_frame_offset[k] = s->cur_offset;
94 s->cur_frame_pts[k] = pts;
95 s->cur_frame_dts[k] = dts;
96
97 /* fill first PTS/DTS */
a62aecce
MN		 98 if (s->fetch_timestamp){
99 s->fetch_timestamp=0;
b84f2a35
FB		 100 s->last_pts = pts;
101 s->last_dts = dts;
c77a9a0e
MN		 102 s->cur_frame_pts[k] =
103 s->cur_frame_dts[k] = AV_NOPTS_VALUE;
b84f2a35 104 }
6e45e928
FB		 105 }
106
8424cf50
FB		 107 /* WARNING: the returned index can be negative */
108 index = s->parser->parser_parse(s, avctx, poutbuf, poutbuf_size, buf, buf_size);
c77a9a0e 109//av_log(NULL, AV_LOG_DEBUG, "parser: in:%lld, %lld, out:%lld, %lld, in:%d out:%d id:%d\n", pts, dts, s->last_pts, s->last_dts, buf_size, *poutbuf_size, avctx->codec_id);
8424cf50
FB		 110 /* update the file pointer */
111 if (*poutbuf_size) {
b84f2a35 112 /* fill the data for the current frame */
8424cf50 113 s->frame_offset = s->last_frame_offset;
b84f2a35
FB		 114 s->pts = s->last_pts;
115 s->dts = s->last_dts;
115329f1 116
b84f2a35 117 /* offset of the next frame */
8424cf50 118 s->last_frame_offset = s->cur_offset + index;
b84f2a35
FB		 119 /* find the packet in which the new frame starts. It
120 is tricky because of MPEG video start codes
121 which can begin in one packet and finish in
122 another packet. In the worst case, an MPEG
123 video start code could be in 4 different
124 packets. */
125 k = s->cur_frame_start_index;
126 for(i = 0; i < AV_PARSER_PTS_NB; i++) {
127 if (s->last_frame_offset >= s->cur_frame_offset[k])
128 break;
129 k = (k - 1) & (AV_PARSER_PTS_NB - 1);
130 }
a62aecce 131
b84f2a35
FB		 132 s->last_pts = s->cur_frame_pts[k];
133 s->last_dts = s->cur_frame_dts[k];
115329f1 134
a62aecce
MN		 135 /* some parsers tell us the packet size even before seeing the first byte of the next packet,
136 so the next pts/dts is in the next chunk */
137 if(index == buf_size){
138 s->fetch_timestamp=1;
139 }
8424cf50
FB		 140 }
141 if (index < 0)
142 index = 0;
143 s->cur_offset += index;
144 return index;
145}
146
73480a15
MN		 147/**
148 *
149 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
748c2fca 150 * @deprecated use AVBitstreamFilter
73480a15 151 */
90ad92b3
MN		 152int av_parser_change(AVCodecParserContext *s,
153 AVCodecContext *avctx,
115329f1 154 uint8_t **poutbuf, int *poutbuf_size,
90ad92b3 155 const uint8_t *buf, int buf_size, int keyframe){
115329f1 156
90ad92b3 157 if(s && s->parser->split){
73480a15 158 if((avctx->flags & CODEC_FLAG_GLOBAL_HEADER) || (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER)){
90ad92b3
MN		 159 int i= s->parser->split(avctx, buf, buf_size);
160 buf += i;
161 buf_size -= i;
162 }
163 }
164
79396ac6
MR		 165 /* cast to avoid warning about discarding qualifiers */
166 *poutbuf= (uint8_t *) buf;
90ad92b3
MN		 167 *poutbuf_size= buf_size;
168 if(avctx->extradata){
169 if( (keyframe && (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER))
170 /*||(s->pict_type != I_TYPE && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_NOKEY))*/
171 /*||(? && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_BEGIN)*/){
172 int size= buf_size + avctx->extradata_size;
173 *poutbuf_size= size;
174 *poutbuf= av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
115329f1 175
90ad92b3 176 memcpy(*poutbuf, avctx->extradata, avctx->extradata_size);
73480a15 177 memcpy((*poutbuf) + avctx->extradata_size, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
90ad92b3
MN		 178 return 1;
179 }
180 }
181
182 return 0;
183}
184
8424cf50
FB		 185void av_parser_close(AVCodecParserContext *s)
186{
187 if (s->parser->parser_close)
188 s->parser->parser_close(s);
189 av_free(s->priv_data);
190 av_free(s);
191}
192
193/*****************************************************/
194
195//#define END_NOT_FOUND (-100)
196
bb270c08
DB		 197#define PICTURE_START_CODE 0x00000100
198#define SEQ_START_CODE 0x000001b3
199#define EXT_START_CODE 0x000001b5
200#define SLICE_MIN_START_CODE 0x00000101
201#define SLICE_MAX_START_CODE 0x000001af
8424cf50
FB		 202
203typedef struct ParseContext1{
e4cb187d
MN		 204 ParseContext pc;
205/* XXX/FIXME PC1 vs. PC */
8424cf50
FB		 206 /* MPEG2 specific */
207 int frame_rate;
208 int progressive_sequence;
209 int width, height;
c6f353ff 210
8424cf50
FB		 211 /* XXX: suppress that, needed by MPEG4 */
212 MpegEncContext *enc;
c6f353ff 213 int first_picture;
8424cf50
FB		 214} ParseContext1;
215
216/**
217 * combines the (truncated) bitstream to a complete frame
218 * @returns -1 if no complete frame could be created
219 */
e4cb187d 220int ff_combine_frame(ParseContext *pc, int next, uint8_t **buf, int *buf_size)
8424cf50
FB		 221{
222#if 0
223 if(pc->overread){
224 printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index);
225 printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
226 }
227#endif
228
229 /* copy overreaded bytes from last frame into buffer */
230 for(; pc->overread>0; pc->overread--){
231 pc->buffer[pc->index++]= pc->buffer[pc->overread_index++];
232 }
f48c0551
MN		 233
234 /* flush remaining if EOF */
235 if(!*buf_size && next == END_NOT_FOUND){
236 next= 0;
237 }
238
8424cf50
FB		 239 pc->last_index= pc->index;
240
241 /* copy into buffer end return */
242 if(next == END_NOT_FOUND){
243 pc->buffer= av_fast_realloc(pc->buffer, &pc->buffer_size, (*buf_size) + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
244
245 memcpy(&pc->buffer[pc->index], *buf, *buf_size);
246 pc->index += *buf_size;
247 return -1;
248 }
249
250 *buf_size=
251 pc->overread_index= pc->index + next;
115329f1 252
8424cf50
FB		 253 /* append to buffer */
254 if(pc->index){
255 pc->buffer= av_fast_realloc(pc->buffer, &pc->buffer_size, next + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
256
257 memcpy(&pc->buffer[pc->index], *buf, next + FF_INPUT_BUFFER_PADDING_SIZE );
258 pc->index = 0;
259 *buf= pc->buffer;
260 }
261
262 /* store overread bytes */
263 for(;next < 0; next++){
264 pc->state = (pc->state<<8) | pc->buffer[pc->last_index + next];
265 pc->overread++;
266 }
267
268#if 0
269 if(pc->overread){
270 printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index);
271 printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
272 }
273#endif
274
275 return 0;
276}
277
8424cf50
FB		 278/* XXX: merge with libavcodec ? */
279#define MPEG1_FRAME_RATE_BASE 1001
280
281static const int frame_rate_tab[16] = {
115329f1 282 0,
8424cf50
FB		 283 24000,
284 24024,
285 25025,
286 30000,
287 30030,
288 50050,
289 60000,
290 60060,
291 // Xing's 15fps: (9)
292 15015,
293 // libmpeg3's "Unofficial economy rates": (10-13)
294 5005,
295 10010,
296 12012,
297 15015,
298 // random, just to avoid segfault !never encode these
299 25025,
300 25025,
301};
302
af9e7d18 303#ifdef CONFIG_MPEGVIDEO_PARSER
c0df9d75 304//FIXME move into mpeg12.c
115329f1 305static void mpegvideo_extract_headers(AVCodecParserContext *s,
8424cf50
FB		 306 AVCodecContext *avctx,
307 const uint8_t *buf, int buf_size)
308{
309 ParseContext1 *pc = s->priv_data;
310 const uint8_t *buf_end;
191e8ca7 311 uint32_t start_code;
8424cf50
FB		 312 int frame_rate_index, ext_type, bytes_left;
313 int frame_rate_ext_n, frame_rate_ext_d;
8dab64b6 314 int picture_structure, top_field_first, repeat_first_field, progressive_frame;
8c787559 315 int horiz_size_ext, vert_size_ext, bit_rate_ext;
90ad92b3 316//FIXME replace the crap with get_bits()
8424cf50
FB		 317 s->repeat_pict = 0;
318 buf_end = buf + buf_size;
319 while (buf < buf_end) {
82fcbc14
MN		 320 start_code= -1;
321 buf= ff_find_start_code(buf, buf_end, &start_code);
8424cf50
FB		 322 bytes_left = buf_end - buf;
323 switch(start_code) {
324 case PICTURE_START_CODE:
325 if (bytes_left >= 2) {
326 s->pict_type = (buf[1] >> 3) & 7;
327 }
328 break;
329 case SEQ_START_CODE:
8c787559 330 if (bytes_left >= 7) {
0b2346d3
MN		 331 pc->width = (buf[0] << 4) | (buf[1] >> 4);
332 pc->height = ((buf[1] & 0x0f) << 8) | buf[2];
21adafec 333 avcodec_set_dimensions(avctx, pc->width, pc->height);
8424cf50 334 frame_rate_index = buf[3] & 0xf;
c0df9d75
MN		 335 pc->frame_rate = avctx->time_base.den = frame_rate_tab[frame_rate_index];
336 avctx->time_base.num = MPEG1_FRAME_RATE_BASE;
8c787559 337 avctx->bit_rate = ((buf[4]<<10) | (buf[5]<<2) | (buf[6]>>6))*400;
3e9d718e
FB		 338 avctx->codec_id = CODEC_ID_MPEG1VIDEO;
339 avctx->sub_id = 1;
8424cf50
FB		 340 }
341 break;
342 case EXT_START_CODE:
343 if (bytes_left >= 1) {
344 ext_type = (buf[0] >> 4);
345 switch(ext_type) {
346 case 0x1: /* sequence extension */
347 if (bytes_left >= 6) {
348 horiz_size_ext = ((buf[1] & 1) << 1) | (buf[2] >> 7);
349 vert_size_ext = (buf[2] >> 5) & 3;
8c787559 350 bit_rate_ext = ((buf[2] & 0x1F)<<7) | (buf[3]>>1);
8424cf50
FB		 351 frame_rate_ext_n = (buf[5] >> 5) & 3;
352 frame_rate_ext_d = (buf[5] & 0x1f);
353 pc->progressive_sequence = buf[1] & (1 << 3);
8ca5d3bb 354 avctx->has_b_frames= !(buf[5] >> 7);
8424cf50 355
0b2346d3
MN		 356 pc->width |=(horiz_size_ext << 12);
357 pc->height |=( vert_size_ext << 12);
8c787559 358 avctx->bit_rate += (bit_rate_ext << 18) * 400;
21adafec 359 avcodec_set_dimensions(avctx, pc->width, pc->height);
c0df9d75
MN		 360 avctx->time_base.den = pc->frame_rate * (frame_rate_ext_n + 1);
361 avctx->time_base.num = MPEG1_FRAME_RATE_BASE * (frame_rate_ext_d + 1);
3e9d718e 362 avctx->codec_id = CODEC_ID_MPEG2VIDEO;
8424cf50
FB		 363 avctx->sub_id = 2; /* forces MPEG2 */
364 }
365 break;
366 case 0x8: /* picture coding extension */
367 if (bytes_left >= 5) {
5bb994e2 368 picture_structure = buf[2]&3;
8424cf50
FB		 369 top_field_first = buf[3] & (1 << 7);
370 repeat_first_field = buf[3] & (1 << 1);
371 progressive_frame = buf[4] & (1 << 7);
115329f1 372
8424cf50
FB		 373 /* check if we must repeat the frame */
374 if (repeat_first_field) {
375 if (pc->progressive_sequence) {
376 if (top_field_first)
377 s->repeat_pict = 4;
378 else
379 s->repeat_pict = 2;
380 } else if (progressive_frame) {
381 s->repeat_pict = 1;
382 }
383 }
115329f1
DB		 384
385 /* the packet only represents half a frame
8dab64b6
MN		 386 XXX,FIXME maybe find a different solution */
387 if(picture_structure != 3)
388 s->repeat_pict = -1;
8424cf50
FB		 389 }
390 break;
391 }
392 }
393 break;
394 case -1:
395 goto the_end;
396 default:
397 /* we stop parsing when we encounter a slice. It ensures
398 that this function takes a negligible amount of time */
115329f1 399 if (start_code >= SLICE_MIN_START_CODE &&
8424cf50
FB		 400 start_code <= SLICE_MAX_START_CODE)
401 goto the_end;
402 break;
403 }
404 }
405 the_end: ;
406}
407
408static int mpegvideo_parse(AVCodecParserContext *s,
409 AVCodecContext *avctx,
115329f1 410 uint8_t **poutbuf, int *poutbuf_size,
8424cf50
FB		 411 const uint8_t *buf, int buf_size)
412{
e4cb187d
MN		 413 ParseContext1 *pc1 = s->priv_data;
414 ParseContext *pc= &pc1->pc;
8424cf50 415 int next;
115329f1 416
7cbaa7ba
MN		 417 if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
418 next= buf_size;
419 }else{
420 next= ff_mpeg1_find_frame_end(pc, buf, buf_size);
115329f1 421
7cbaa7ba
MN		 422 if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
423 *poutbuf = NULL;
424 *poutbuf_size = 0;
425 return buf_size;
426 }
115329f1 427
8424cf50
FB		 428 }
429 /* we have a full frame : we just parse the first few MPEG headers
430 to have the full timing information. The time take by this
431 function should be negligible for uncorrupted streams */
432 mpegvideo_extract_headers(s, avctx, buf, buf_size);
433#if 0
115329f1 434 printf("pict_type=%d frame_rate=%0.3f repeat_pict=%d\n",
c0df9d75 435 s->pict_type, (double)avctx->time_base.den / avctx->time_base.num, s->repeat_pict);
8424cf50
FB		 436#endif
437
438 *poutbuf = (uint8_t *)buf;
439 *poutbuf_size = buf_size;
440 return next;
441}
442
90ad92b3
MN		 443static int mpegvideo_split(AVCodecContext *avctx,
444 const uint8_t *buf, int buf_size)
445{
446 int i;
447 uint32_t state= -1;
115329f1 448
90ad92b3
MN		 449 for(i=0; i<buf_size; i++){
450 state= (state<<8) | buf[i];
451 if(state != 0x1B3 && state != 0x1B5 && state < 0x200 && state >= 0x100)
73480a15 452 return i-3;
90ad92b3
MN		 453 }
454 return 0;
455}
af9e7d18 456#endif /* CONFIG_MPEGVIDEO_PARSER */
90ad92b3 457
e4cb187d 458void ff_parse_close(AVCodecParserContext *s)
8424cf50 459{
e4cb187d 460 ParseContext *pc = s->priv_data;
8424cf50
FB		 461
462 av_free(pc->buffer);
8424cf50
FB		 463}
464
e4cb187d 465static void parse1_close(AVCodecParserContext *s)
8424cf50 466{
e4cb187d 467 ParseContext1 *pc1 = s->priv_data;
8424cf50 468
e4cb187d
MN		 469 av_free(pc1->pc.buffer);
470 av_free(pc1->enc);
8424cf50
FB		 471}
472
e4cb187d
MN		 473/*************************/
474
af9e7d18 475#ifdef CONFIG_MPEG4VIDEO_PARSER
8424cf50
FB		 476/* used by parser */
477/* XXX: make it use less memory */
115329f1 478static int av_mpeg4_decode_header(AVCodecParserContext *s1,
8424cf50
FB		 479 AVCodecContext *avctx,
480 const uint8_t *buf, int buf_size)
481{
482 ParseContext1 *pc = s1->priv_data;
483 MpegEncContext *s = pc->enc;
484 GetBitContext gb1, *gb = &gb1;
485 int ret;
486
487 s->avctx = avctx;
c6f353ff
FB		 488 s->current_picture_ptr = &s->current_picture;
489
490 if (avctx->extradata_size && pc->first_picture){
491 init_get_bits(gb, avctx->extradata, avctx->extradata_size*8);
492 ret = ff_mpeg4_decode_picture_header(s, gb);
493 }
494
8424cf50
FB		 495 init_get_bits(gb, buf, 8 * buf_size);
496 ret = ff_mpeg4_decode_picture_header(s, gb);
497 if (s->width) {
21adafec 498 avcodec_set_dimensions(avctx, s->width, s->height);
8424cf50 499 }
7cbaa7ba 500 s1->pict_type= s->pict_type;
c6f353ff 501 pc->first_picture = 0;
8424cf50
FB		 502 return ret;
503}
504
e96682e6 505static int mpeg4video_parse_init(AVCodecParserContext *s)
8424cf50
FB		 506{
507 ParseContext1 *pc = s->priv_data;
c6f353ff 508
8424cf50
FB		 509 pc->enc = av_mallocz(sizeof(MpegEncContext));
510 if (!pc->enc)
511 return -1;
c6f353ff 512 pc->first_picture = 1;
8424cf50
FB		 513 return 0;
514}
515
516static int mpeg4video_parse(AVCodecParserContext *s,
517 AVCodecContext *avctx,
115329f1 518 uint8_t **poutbuf, int *poutbuf_size,
8424cf50
FB		 519 const uint8_t *buf, int buf_size)
520{
e4cb187d 521 ParseContext *pc = s->priv_data;
8424cf50 522 int next;
115329f1 523
7cbaa7ba
MN		 524 if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
525 next= buf_size;
526 }else{
527 next= ff_mpeg4_find_frame_end(pc, buf, buf_size);
115329f1 528
7cbaa7ba
MN		 529 if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
530 *poutbuf = NULL;
531 *poutbuf_size = 0;
532 return buf_size;
533 }
8424cf50
FB		 534 }
535 av_mpeg4_decode_header(s, avctx, buf, buf_size);
536
537 *poutbuf = (uint8_t *)buf;
538 *poutbuf_size = buf_size;
539 return next;
540}
af9e7d18 541#endif
8424cf50 542
af9e7d18 543#ifdef CONFIG_CAVSVIDEO_PARSER
b482e2d1
MN		 544static int cavsvideo_parse(AVCodecParserContext *s,
545 AVCodecContext *avctx,
546 uint8_t **poutbuf, int *poutbuf_size,
547 const uint8_t *buf, int buf_size)
548{
549 ParseContext *pc = s->priv_data;
550 int next;
551
552 if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
553 next= buf_size;
554 }else{
555 next= ff_cavs_find_frame_end(pc, buf, buf_size);
556
557 if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
558 *poutbuf = NULL;
559 *poutbuf_size = 0;
560 return buf_size;
561 }
562 }
563 *poutbuf = (uint8_t *)buf;
564 *poutbuf_size = buf_size;
565 return next;
566}
af9e7d18 567#endif /* CONFIG_CAVSVIDEO_PARSER */
b482e2d1 568
90ad92b3
MN		 569static int mpeg4video_split(AVCodecContext *avctx,
570 const uint8_t *buf, int buf_size)
571{
572 int i;
573 uint32_t state= -1;
115329f1 574
90ad92b3
MN		 575 for(i=0; i<buf_size; i++){
576 state= (state<<8) | buf[i];
577 if(state == 0x1B3 || state == 0x1B6)
73480a15 578 return i-3;
90ad92b3
MN		 579 }
580 return 0;
581}
582
8424cf50
FB		 583/*************************/
584
af9e7d18 585#ifdef CONFIG_MPEGAUDIO_PARSER
8424cf50 586typedef struct MpegAudioParseContext {
bb270c08 587 uint8_t inbuf[MPA_MAX_CODED_FRAME_SIZE]; /* input buffer */
8424cf50
FB		 588 uint8_t *inbuf_ptr;
589 int frame_size;
590 int free_format_frame_size;
591 int free_format_next_header;
4b9ac0b5
MN		 592 uint32_t header;
593 int header_count;
8424cf50
FB		 594} MpegAudioParseContext;
595
596#define MPA_HEADER_SIZE 4
597
598/* header + layer + bitrate + freq + lsf/mpeg25 */
88730be6 599#undef SAME_HEADER_MASK /* mpegaudio.h defines different version */
8424cf50 600#define SAME_HEADER_MASK \
e993bc03 601 (0xffe00000 | (3 << 17) | (3 << 10) | (3 << 19))
8424cf50
FB		 602
603static int mpegaudio_parse_init(AVCodecParserContext *s1)
604{
605 MpegAudioParseContext *s = s1->priv_data;
606 s->inbuf_ptr = s->inbuf;
607 return 0;
608}
609
610static int mpegaudio_parse(AVCodecParserContext *s1,
611 AVCodecContext *avctx,
115329f1 612 uint8_t **poutbuf, int *poutbuf_size,
8424cf50
FB		 613 const uint8_t *buf, int buf_size)
614{
615 MpegAudioParseContext *s = s1->priv_data;
4b9ac0b5 616 int len, ret, sr;
8424cf50
FB		 617 uint32_t header;
618 const uint8_t *buf_ptr;
619
620 *poutbuf = NULL;
621 *poutbuf_size = 0;
622 buf_ptr = buf;
623 while (buf_size > 0) {
bb270c08
DB		 624 len = s->inbuf_ptr - s->inbuf;
625 if (s->frame_size == 0) {
8424cf50
FB		 626 /* special case for next header for first frame in free
627 format case (XXX: find a simpler method) */
628 if (s->free_format_next_header != 0) {
629 s->inbuf[0] = s->free_format_next_header >> 24;
630 s->inbuf[1] = s->free_format_next_header >> 16;
631 s->inbuf[2] = s->free_format_next_header >> 8;
632 s->inbuf[3] = s->free_format_next_header;
633 s->inbuf_ptr = s->inbuf + 4;
634 s->free_format_next_header = 0;
635 goto got_header;
636 }
bb270c08 637 /* no header seen : find one. We need at least MPA_HEADER_SIZE
8424cf50 638 bytes to parse it */
4e2d6a45 639 len = FFMIN(MPA_HEADER_SIZE - len, buf_size);
bb270c08
DB		 640 if (len > 0) {
641 memcpy(s->inbuf_ptr, buf_ptr, len);
642 buf_ptr += len;
643 buf_size -= len;
644 s->inbuf_ptr += len;
645 }
646 if ((s->inbuf_ptr - s->inbuf) >= MPA_HEADER_SIZE) {
8424cf50 647 got_header:
4b9ac0b5 648 sr= avctx->sample_rate;
bb270c08
DB		 649 header = (s->inbuf[0] << 24) | (s->inbuf[1] << 16) |
650 (s->inbuf[2] << 8) | s->inbuf[3];
8424cf50
FB		 651
652 ret = mpa_decode_header(avctx, header);
653 if (ret < 0) {
4b9ac0b5 654 s->header_count= -2;
bb270c08
DB		 655 /* no sync found : move by one byte (inefficient, but simple!) */
656 memmove(s->inbuf, s->inbuf + 1, s->inbuf_ptr - s->inbuf - 1);
657 s->inbuf_ptr--;
8424cf50
FB		 658 dprintf("skip %x\n", header);
659 /* reset free format frame size to give a chance
660 to get a new bitrate */
661 s->free_format_frame_size = 0;
bb270c08 662 } else {
4b9ac0b5
MN		 663 if((header&SAME_HEADER_MASK) != (s->header&SAME_HEADER_MASK) && s->header)
664 s->header_count= -3;
665 s->header= header;
666 s->header_count++;
8424cf50 667 s->frame_size = ret;
115329f1 668
8424cf50
FB		 669#if 0
670 /* free format: prepare to compute frame size */
bb270c08
DB		 671 if (decode_header(s, header) == 1) {
672 s->frame_size = -1;
8424cf50
FB		 673 }
674#endif
bb270c08 675 }
4b9ac0b5
MN		 676 if(s->header_count <= 0)
677 avctx->sample_rate= sr; //FIXME ugly
bb270c08 678 }
115329f1 679 } else
8424cf50
FB		 680#if 0
681 if (s->frame_size == -1) {
682 /* free format : find next sync to compute frame size */
bb270c08
DB		 683 len = MPA_MAX_CODED_FRAME_SIZE - len;
684 if (len > buf_size)
685 len = buf_size;
8424cf50 686 if (len == 0) {
bb270c08 687 /* frame too long: resync */
8424cf50 688 s->frame_size = 0;
bb270c08
DB		 689 memmove(s->inbuf, s->inbuf + 1, s->inbuf_ptr - s->inbuf - 1);
690 s->inbuf_ptr--;
8424cf50
FB		 691 } else {
692 uint8_t *p, *pend;
693 uint32_t header1;
694 int padding;
695
696 memcpy(s->inbuf_ptr, buf_ptr, len);
697 /* check for header */
698 p = s->inbuf_ptr - 3;
699 pend = s->inbuf_ptr + len - 4;
700 while (p <= pend) {
701 header = (p[0] << 24) | (p[1] << 16) |
702 (p[2] << 8) | p[3];
703 header1 = (s->inbuf[0] << 24) | (s->inbuf[1] << 16) |
704 (s->inbuf[2] << 8) | s->inbuf[3];
705 /* check with high probability that we have a
706 valid header */
707 if ((header & SAME_HEADER_MASK) ==
708 (header1 & SAME_HEADER_MASK)) {
709 /* header found: update pointers */
710 len = (p + 4) - s->inbuf_ptr;
711 buf_ptr += len;
712 buf_size -= len;
713 s->inbuf_ptr = p;
714 /* compute frame size */
715 s->free_format_next_header = header;
716 s->free_format_frame_size = s->inbuf_ptr - s->inbuf;
717 padding = (header1 >> 9) & 1;
718 if (s->layer == 1)
719 s->free_format_frame_size -= padding * 4;
720 else
721 s->free_format_frame_size -= padding;
115329f1 722 dprintf("free frame size=%d padding=%d\n",
8424cf50
FB		 723 s->free_format_frame_size, padding);
724 decode_header(s, header1);
725 goto next_data;
726 }
727 p++;
728 }
729 /* not found: simply increase pointers */
730 buf_ptr += len;
731 s->inbuf_ptr += len;
732 buf_size -= len;
733 }
bb270c08 734 } else
8424cf50
FB		 735#endif
736 if (len < s->frame_size) {
737 if (s->frame_size > MPA_MAX_CODED_FRAME_SIZE)
738 s->frame_size = MPA_MAX_CODED_FRAME_SIZE;
4e2d6a45 739 len = FFMIN(s->frame_size - len, buf_size);
bb270c08
DB		 740 memcpy(s->inbuf_ptr, buf_ptr, len);
741 buf_ptr += len;
742 s->inbuf_ptr += len;
743 buf_size -= len;
744 }
4e2d6a45
MN		 745
746 if(s->frame_size > 0 && buf_ptr - buf == s->inbuf_ptr - s->inbuf
747 && buf_size + buf_ptr - buf >= s->frame_size){
748 if(s->header_count > 0){
749 *poutbuf = buf;
750 *poutbuf_size = s->frame_size;
751 }
752 buf_ptr = buf + s->frame_size;
753 s->inbuf_ptr = s->inbuf;
754 s->frame_size = 0;
755 break;
756 }
757
8424cf50 758 // next_data:
115329f1 759 if (s->frame_size > 0 &&
8424cf50 760 (s->inbuf_ptr - s->inbuf) >= s->frame_size) {
4b9ac0b5
MN		 761 if(s->header_count > 0){
762 *poutbuf = s->inbuf;
763 *poutbuf_size = s->inbuf_ptr - s->inbuf;
764 }
bb270c08
DB		 765 s->inbuf_ptr = s->inbuf;
766 s->frame_size = 0;
767 break;
768 }
8424cf50
FB		 769 }
770 return buf_ptr - buf;
771}
af9e7d18 772#endif /* CONFIG_MPEGAUDIO_PARSER */
8424cf50 773
af9e7d18 774#if defined(CONFIG_AC3_PARSER) || defined(CONFIG_AAC_PARSER)
da46276f 775/* also used for ADTS AAC */
8424cf50 776typedef struct AC3ParseContext {
8424cf50
FB		 777 uint8_t *inbuf_ptr;
778 int frame_size;
da46276f
MR		 779 int header_size;
780 int (*sync)(const uint8_t *buf, int *channels, int *sample_rate,
781 int *bit_rate, int *samples);
4f8ff17e 782 uint8_t inbuf[8192]; /* input buffer */
8424cf50
FB		 783} AC3ParseContext;
784
785#define AC3_HEADER_SIZE 7
100a7422 786#define AAC_HEADER_SIZE 7
62327e28 787
af9e7d18 788#ifdef CONFIG_AC3_PARSER
62327e28
MR		 789static const int ac3_sample_rates[4] = {
790 48000, 44100, 32000, 0
791};
792
793static const int ac3_frame_sizes[64][3] = {
4f59b684
DB		 794 { 64, 69, 96 },
795 { 64, 70, 96 },
796 { 80, 87, 120 },
797 { 80, 88, 120 },
798 { 96, 104, 144 },
799 { 96, 105, 144 },
800 { 112, 121, 168 },
801 { 112, 122, 168 },
802 { 128, 139, 192 },
803 { 128, 140, 192 },
804 { 160, 174, 240 },
805 { 160, 175, 240 },
806 { 192, 208, 288 },
807 { 192, 209, 288 },
808 { 224, 243, 336 },
809 { 224, 244, 336 },
810 { 256, 278, 384 },
811 { 256, 279, 384 },
812 { 320, 348, 480 },
813 { 320, 349, 480 },
814 { 384, 417, 576 },
815 { 384, 418, 576 },
816 { 448, 487, 672 },
817 { 448, 488, 672 },
818 { 512, 557, 768 },
819 { 512, 558, 768 },
820 { 640, 696, 960 },
821 { 640, 697, 960 },
822 { 768, 835, 1152 },
823 { 768, 836, 1152 },
824 { 896, 975, 1344 },
825 { 896, 976, 1344 },
62327e28
MR		 826 { 1024, 1114, 1536 },
827 { 1024, 1115, 1536 },
828 { 1152, 1253, 1728 },
829 { 1152, 1254, 1728 },
830 { 1280, 1393, 1920 },
831 { 1280, 1394, 1920 },
832};
833
834static const int ac3_bitrates[64] = {
835 32, 32, 40, 40, 48, 48, 56, 56, 64, 64, 80, 80, 96, 96, 112, 112,
836 128, 128, 160, 160, 192, 192, 224, 224, 256, 256, 320, 320, 384,
837 384, 448, 448, 512, 512, 576, 576, 640, 640,
838};
839
840static const int ac3_channels[8] = {
841 2, 1, 2, 3, 3, 4, 4, 5
842};
af9e7d18 843#endif /* CONFIG_AC3_PARSER */
62327e28 844
af9e7d18 845#ifdef CONFIG_AAC_PARSER
608bd843 846static const int aac_sample_rates[16] = {
da46276f
MR		 847 96000, 88200, 64000, 48000, 44100, 32000,
848 24000, 22050, 16000, 12000, 11025, 8000, 7350
849};
850
608bd843 851static const int aac_channels[8] = {
da46276f
MR		 852 0, 1, 2, 3, 4, 5, 6, 8
853};
af9e7d18 854#endif
da46276f 855
af9e7d18 856#ifdef CONFIG_AC3_PARSER
62327e28 857static int ac3_sync(const uint8_t *buf, int *channels, int *sample_rate,
da46276f 858 int *bit_rate, int *samples)
62327e28
MR		 859{
860 unsigned int fscod, frmsizecod, acmod, bsid, lfeon;
861 GetBitContext bits;
862
863 init_get_bits(&bits, buf, AC3_HEADER_SIZE * 8);
864
865 if(get_bits(&bits, 16) != 0x0b77)
4f59b684 866 return 0;
62327e28 867
100a7422 868 skip_bits(&bits, 16); /* crc */
62327e28
MR		 869 fscod = get_bits(&bits, 2);
870 frmsizecod = get_bits(&bits, 6);
871
872 if(!ac3_sample_rates[fscod])
4f59b684 873 return 0;
62327e28
MR		 874
875 bsid = get_bits(&bits, 5);
876 if(bsid > 8)
4f59b684 877 return 0;
100a7422 878 skip_bits(&bits, 3); /* bsmod */
62327e28
MR		 879 acmod = get_bits(&bits, 3);
880 if(acmod & 1 && acmod != 1)
100a7422 881 skip_bits(&bits, 2); /* cmixlev */
62327e28 882 if(acmod & 4)
100a7422 883 skip_bits(&bits, 2); /* surmixlev */
62327e28 884 if(acmod & 2)
100a7422
MR		 885 skip_bits(&bits, 2); /* dsurmod */
886 lfeon = get_bits1(&bits);
62327e28
MR		 887
888 *sample_rate = ac3_sample_rates[fscod];
889 *bit_rate = ac3_bitrates[frmsizecod] * 1000;
890 *channels = ac3_channels[acmod] + lfeon;
da46276f 891 *samples = 6 * 256;
62327e28
MR		 892
893 return ac3_frame_sizes[frmsizecod][fscod] * 2;
894}
af9e7d18 895#endif /* CONFIG_AC3_PARSER */
8424cf50 896
af9e7d18 897#ifdef CONFIG_AAC_PARSER
da46276f
MR		 898static int aac_sync(const uint8_t *buf, int *channels, int *sample_rate,
899 int *bit_rate, int *samples)
900{
901 GetBitContext bits;
902 int size, rdb, ch, sr;
903
904 init_get_bits(&bits, buf, AAC_HEADER_SIZE * 8);
905
906 if(get_bits(&bits, 12) != 0xfff)
907 return 0;
908
100a7422
MR		 909 skip_bits1(&bits); /* id */
910 skip_bits(&bits, 2); /* layer */
911 skip_bits1(&bits); /* protection_absent */
912 skip_bits(&bits, 2); /* profile_objecttype */
913 sr = get_bits(&bits, 4); /* sample_frequency_index */
da46276f
MR		 914 if(!aac_sample_rates[sr])
915 return 0;
100a7422
MR		 916 skip_bits1(&bits); /* private_bit */
917 ch = get_bits(&bits, 3); /* channel_configuration */
da46276f
MR		 918 if(!aac_channels[ch])
919 return 0;
100a7422
MR		 920 skip_bits1(&bits); /* original/copy */
921 skip_bits1(&bits); /* home */
da46276f
MR		 922
923 /* adts_variable_header */
100a7422
MR		 924 skip_bits1(&bits); /* copyright_identification_bit */
925 skip_bits1(&bits); /* copyright_identification_start */
926 size = get_bits(&bits, 13); /* aac_frame_length */
927 skip_bits(&bits, 11); /* adts_buffer_fullness */
928 rdb = get_bits(&bits, 2); /* number_of_raw_data_blocks_in_frame */
da46276f
MR		 929
930 *channels = aac_channels[ch];
931 *sample_rate = aac_sample_rates[sr];
932 *samples = (rdb + 1) * 1024;
933 *bit_rate = size * 8 * *sample_rate / *samples;
934
935 return size;
936}
af9e7d18 937#endif /* CONFIG_AAC_PARSER */
da46276f 938
af9e7d18 939#ifdef CONFIG_AC3_PARSER
8424cf50
FB		 940static int ac3_parse_init(AVCodecParserContext *s1)
941{
942 AC3ParseContext *s = s1->priv_data;
943 s->inbuf_ptr = s->inbuf;
da46276f
MR		 944 s->header_size = AC3_HEADER_SIZE;
945 s->sync = ac3_sync;
8424cf50
FB		 946 return 0;
947}
af9e7d18 948#endif
8424cf50 949
af9e7d18 950#ifdef CONFIG_AAC_PARSER
da46276f
MR		 951static int aac_parse_init(AVCodecParserContext *s1)
952{
953 AC3ParseContext *s = s1->priv_data;
954 s->inbuf_ptr = s->inbuf;
955 s->header_size = AAC_HEADER_SIZE;
956 s->sync = aac_sync;
957 return 0;
958}
af9e7d18 959#endif
da46276f
MR		 960
961/* also used for ADTS AAC */
8424cf50
FB		 962static int ac3_parse(AVCodecParserContext *s1,
963 AVCodecContext *avctx,
115329f1 964 uint8_t **poutbuf, int *poutbuf_size,
8424cf50
FB		 965 const uint8_t *buf, int buf_size)
966{
967 AC3ParseContext *s = s1->priv_data;
968 const uint8_t *buf_ptr;
da46276f 969 int len, sample_rate, bit_rate, channels, samples;
8424cf50
FB		 970
971 *poutbuf = NULL;
972 *poutbuf_size = 0;
973
974 buf_ptr = buf;
975 while (buf_size > 0) {
976 len = s->inbuf_ptr - s->inbuf;
977 if (s->frame_size == 0) {
da46276f
MR		 978 /* no header seen : find one. We need at least s->header_size
979 bytes to parse it */
980 len = FFMIN(s->header_size - len, buf_size);
d8a91afd 981
8424cf50
FB		 982 memcpy(s->inbuf_ptr, buf_ptr, len);
983 buf_ptr += len;
984 s->inbuf_ptr += len;
985 buf_size -= len;
da46276f
MR		 986 if ((s->inbuf_ptr - s->inbuf) == s->header_size) {
987 len = s->sync(s->inbuf, &channels, &sample_rate, &bit_rate,
988 &samples);
8424cf50
FB		 989 if (len == 0) {
990 /* no sync found : move by one byte (inefficient, but simple!) */
da46276f 991 memmove(s->inbuf, s->inbuf + 1, s->header_size - 1);
8424cf50
FB		 992 s->inbuf_ptr--;
993 } else {
bb270c08 994 s->frame_size = len;
8424cf50
FB		 995 /* update codec info */
996 avctx->sample_rate = sample_rate;
20da3179 997 /* set channels,except if the user explicitly requests 1 or 2 channels, XXX/FIXME this is a bit ugly */
da46276f
MR		 998 if(avctx->codec_id == CODEC_ID_AC3){
999 if(avctx->channels!=1 && avctx->channels!=2){
1000 avctx->channels = channels;
1001 }
1002 } else {
4f59b684 1003 avctx->channels = channels;
20da3179 1004 }
bb270c08 1005 avctx->bit_rate = bit_rate;
da46276f 1006 avctx->frame_size = samples;
8424cf50
FB		 1007 }
1008 }
d8a91afd
MN		 1009 } else {
1010 len = FFMIN(s->frame_size - len, buf_size);
8424cf50
FB		 1011
1012 memcpy(s->inbuf_ptr, buf_ptr, len);
1013 buf_ptr += len;
1014 s->inbuf_ptr += len;
1015 buf_size -= len;
d8a91afd
MN		 1016
1017 if(s->inbuf_ptr - s->inbuf == s->frame_size){
1018 *poutbuf = s->inbuf;
1019 *poutbuf_size = s->frame_size;
1020 s->inbuf_ptr = s->inbuf;
1021 s->frame_size = 0;
1022 break;
1023 }
8424cf50
FB		 1024 }
1025 }
1026 return buf_ptr - buf;
1027}
af9e7d18 1028#endif /* CONFIG_AC3_PARSER || CONFIG_AAC_PARSER */
8424cf50 1029
af9e7d18 1030#ifdef CONFIG_MPEGVIDEO_PARSER
8424cf50
FB		 1031AVCodecParser mpegvideo_parser = {
1032 { CODEC_ID_MPEG1VIDEO, CODEC_ID_MPEG2VIDEO },
1033 sizeof(ParseContext1),
1034 NULL,
1035 mpegvideo_parse,
e4cb187d 1036 parse1_close,
90ad92b3 1037 mpegvideo_split,
8424cf50 1038};
af9e7d18
MR		 1039#endif
1040#ifdef CONFIG_MPEG4VIDEO_PARSER
8424cf50
FB		 1041AVCodecParser mpeg4video_parser = {
1042 { CODEC_ID_MPEG4 },
1043 sizeof(ParseContext1),
1044 mpeg4video_parse_init,
1045 mpeg4video_parse,
e4cb187d 1046 parse1_close,
90ad92b3 1047 mpeg4video_split,
8424cf50 1048};
af9e7d18
MR		 1049#endif
1050#ifdef CONFIG_CAVSVIDEO_PARSER
b482e2d1
MN		 1051AVCodecParser cavsvideo_parser = {
1052 { CODEC_ID_CAVS },
1053 sizeof(ParseContext1),
1054 NULL,
1055 cavsvideo_parse,
1056 parse1_close,
1057 mpeg4video_split,
1058};
29c5cdca 1059#endif
af9e7d18 1060#ifdef CONFIG_MPEGAUDIO_PARSER
8424cf50
FB		 1061AVCodecParser mpegaudio_parser = {
1062 { CODEC_ID_MP2, CODEC_ID_MP3 },
1063 sizeof(MpegAudioParseContext),
1064 mpegaudio_parse_init,
1065 mpegaudio_parse,
1066 NULL,
1067};
af9e7d18
MR		 1068#endif
1069#ifdef CONFIG_AC3_PARSER
8424cf50
FB		 1070AVCodecParser ac3_parser = {
1071 { CODEC_ID_AC3 },
1072 sizeof(AC3ParseContext),
1073 ac3_parse_init,
1074 ac3_parse,
1075 NULL,
1076};
af9e7d18
MR		 1077#endif
1078#ifdef CONFIG_AAC_PARSER
da46276f
MR		 1079AVCodecParser aac_parser = {
1080 { CODEC_ID_AAC },
1081 sizeof(AC3ParseContext),
1082 aac_parse_init,
1083 ac3_parse,
1084 NULL,
1085};
af9e7d18 1086#endif
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