2 * Audio and Video frame extraction
3 * Copyright (c) 2003 Fabrice Bellard.
4 * Copyright (c) 2003 Michael Niedermayer.
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #include "mpegvideo.h"
22 #include "mpegaudio.h"
24 AVCodecParser *av_first_parser = NULL;
26 void av_register_codec_parser(AVCodecParser *parser)
28 parser->next = av_first_parser;
29 av_first_parser = parser;
32 AVCodecParserContext *av_parser_init(int codec_id)
34 AVCodecParserContext *s;
35 AVCodecParser *parser;
38 if(codec_id == CODEC_ID_NONE)
41 for(parser = av_first_parser; parser != NULL; parser = parser->next) {
42 if (parser->codec_ids[0] == codec_id ||
43 parser->codec_ids[1] == codec_id ||
44 parser->codec_ids[2] == codec_id ||
45 parser->codec_ids[3] == codec_id ||
46 parser->codec_ids[4] == codec_id)
51 s = av_mallocz(sizeof(AVCodecParserContext));
55 s->priv_data = av_mallocz(parser->priv_data_size);
60 if (parser->parser_init) {
61 ret = parser->parser_init(s);
63 av_free(s->priv_data);
72 /* NOTE: buf_size == 0 is used to signal EOF so that the last frame
73 can be returned if necessary */
74 int av_parser_parse(AVCodecParserContext *s,
75 AVCodecContext *avctx,
76 uint8_t **poutbuf, int *poutbuf_size,
77 const uint8_t *buf, int buf_size,
78 int64_t pts, int64_t dts)
81 uint8_t dummy_buf[FF_INPUT_BUFFER_PADDING_SIZE];
84 /* padding is always necessary even if EOF, so we add it here */
85 memset(dummy_buf, 0, sizeof(dummy_buf));
88 /* add a new packet descriptor */
89 k = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
90 s->cur_frame_start_index = k;
91 s->cur_frame_offset[k] = s->cur_offset;
92 s->cur_frame_pts[k] = pts;
93 s->cur_frame_dts[k] = dts;
95 /* fill first PTS/DTS */
96 if (s->fetch_timestamp){
100 s->cur_frame_pts[k] =
101 s->cur_frame_dts[k] = AV_NOPTS_VALUE;
105 /* WARNING: the returned index can be negative */
106 index = s->parser->parser_parse(s, avctx, poutbuf, poutbuf_size, buf, buf_size);
107 //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);
108 /* update the file pointer */
110 /* fill the data for the current frame */
111 s->frame_offset = s->last_frame_offset;
112 s->pts = s->last_pts;
113 s->dts = s->last_dts;
115 /* offset of the next frame */
116 s->last_frame_offset = s->cur_offset + index;
117 /* find the packet in which the new frame starts. It
118 is tricky because of MPEG video start codes
119 which can begin in one packet and finish in
120 another packet. In the worst case, an MPEG
121 video start code could be in 4 different
123 k = s->cur_frame_start_index;
124 for(i = 0; i < AV_PARSER_PTS_NB; i++) {
125 if (s->last_frame_offset >= s->cur_frame_offset[k])
127 k = (k - 1) & (AV_PARSER_PTS_NB - 1);
130 s->last_pts = s->cur_frame_pts[k];
131 s->last_dts = s->cur_frame_dts[k];
133 /* some parsers tell us the packet size even before seeing the first byte of the next packet,
134 so the next pts/dts is in the next chunk */
135 if(index == buf_size){
136 s->fetch_timestamp=1;
141 s->cur_offset += index;
147 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
148 * @deprecated use AVBitstreamFilter
150 int av_parser_change(AVCodecParserContext *s,
151 AVCodecContext *avctx,
152 uint8_t **poutbuf, int *poutbuf_size,
153 const uint8_t *buf, int buf_size, int keyframe){
155 if(s && s->parser->split){
156 if((avctx->flags & CODEC_FLAG_GLOBAL_HEADER) || (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER)){
157 int i= s->parser->split(avctx, buf, buf_size);
163 /* cast to avoid warning about discarding qualifiers */
164 *poutbuf= (uint8_t *) buf;
165 *poutbuf_size= buf_size;
166 if(avctx->extradata){
167 if( (keyframe && (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER))
168 /*||(s->pict_type != I_TYPE && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_NOKEY))*/
169 /*||(? && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_BEGIN)*/){
170 int size= buf_size + avctx->extradata_size;
172 *poutbuf= av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
174 memcpy(*poutbuf, avctx->extradata, avctx->extradata_size);
175 memcpy((*poutbuf) + avctx->extradata_size, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
183 void av_parser_close(AVCodecParserContext *s)
185 if (s->parser->parser_close)
186 s->parser->parser_close(s);
187 av_free(s->priv_data);
191 /*****************************************************/
193 //#define END_NOT_FOUND (-100)
195 #define PICTURE_START_CODE 0x00000100
196 #define SEQ_START_CODE 0x000001b3
197 #define EXT_START_CODE 0x000001b5
198 #define SLICE_MIN_START_CODE 0x00000101
199 #define SLICE_MAX_START_CODE 0x000001af
201 typedef struct ParseContext1{
203 /* XXX/FIXME PC1 vs. PC */
206 int progressive_sequence;
209 /* XXX: suppress that, needed by MPEG4 */
215 * combines the (truncated) bitstream to a complete frame
216 * @returns -1 if no complete frame could be created
218 int ff_combine_frame(ParseContext *pc, int next, uint8_t **buf, int *buf_size)
222 printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index);
223 printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
227 /* copy overreaded bytes from last frame into buffer */
228 for(; pc->overread>0; pc->overread--){
229 pc->buffer[pc->index++]= pc->buffer[pc->overread_index++];
232 /* flush remaining if EOF */
233 if(!*buf_size && next == END_NOT_FOUND){
237 pc->last_index= pc->index;
239 /* copy into buffer end return */
240 if(next == END_NOT_FOUND){
241 pc->buffer= av_fast_realloc(pc->buffer, &pc->buffer_size, (*buf_size) + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
243 memcpy(&pc->buffer[pc->index], *buf, *buf_size);
244 pc->index += *buf_size;
249 pc->overread_index= pc->index + next;
251 /* append to buffer */
253 pc->buffer= av_fast_realloc(pc->buffer, &pc->buffer_size, next + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
255 memcpy(&pc->buffer[pc->index], *buf, next + FF_INPUT_BUFFER_PADDING_SIZE );
260 /* store overread bytes */
261 for(;next < 0; next++){
262 pc->state = (pc->state<<8) | pc->buffer[pc->last_index + next];
268 printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index);
269 printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
276 /* XXX: merge with libavcodec ? */
277 #define MPEG1_FRAME_RATE_BASE 1001
279 static const int frame_rate_tab[16] = {
291 // libmpeg3's "Unofficial economy rates": (10-13)
296 // random, just to avoid segfault !never encode these
301 //FIXME move into mpeg12.c
302 static void mpegvideo_extract_headers(AVCodecParserContext *s,
303 AVCodecContext *avctx,
304 const uint8_t *buf, int buf_size)
306 ParseContext1 *pc = s->priv_data;
307 const uint8_t *buf_end;
309 int frame_rate_index, ext_type, bytes_left;
310 int frame_rate_ext_n, frame_rate_ext_d;
311 int picture_structure, top_field_first, repeat_first_field, progressive_frame;
312 int horiz_size_ext, vert_size_ext, bit_rate_ext;
313 //FIXME replace the crap with get_bits()
315 buf_end = buf + buf_size;
316 while (buf < buf_end) {
318 buf= ff_find_start_code(buf, buf_end, &start_code);
319 bytes_left = buf_end - buf;
321 case PICTURE_START_CODE:
322 if (bytes_left >= 2) {
323 s->pict_type = (buf[1] >> 3) & 7;
327 if (bytes_left >= 7) {
328 pc->width = (buf[0] << 4) | (buf[1] >> 4);
329 pc->height = ((buf[1] & 0x0f) << 8) | buf[2];
330 avcodec_set_dimensions(avctx, pc->width, pc->height);
331 frame_rate_index = buf[3] & 0xf;
332 pc->frame_rate = avctx->time_base.den = frame_rate_tab[frame_rate_index];
333 avctx->time_base.num = MPEG1_FRAME_RATE_BASE;
334 avctx->bit_rate = ((buf[4]<<10) | (buf[5]<<2) | (buf[6]>>6))*400;
335 avctx->codec_id = CODEC_ID_MPEG1VIDEO;
340 if (bytes_left >= 1) {
341 ext_type = (buf[0] >> 4);
343 case 0x1: /* sequence extension */
344 if (bytes_left >= 6) {
345 horiz_size_ext = ((buf[1] & 1) << 1) | (buf[2] >> 7);
346 vert_size_ext = (buf[2] >> 5) & 3;
347 bit_rate_ext = ((buf[2] & 0x1F)<<7) | (buf[3]>>1);
348 frame_rate_ext_n = (buf[5] >> 5) & 3;
349 frame_rate_ext_d = (buf[5] & 0x1f);
350 pc->progressive_sequence = buf[1] & (1 << 3);
351 avctx->has_b_frames= !(buf[5] >> 7);
353 pc->width |=(horiz_size_ext << 12);
354 pc->height |=( vert_size_ext << 12);
355 avctx->bit_rate += (bit_rate_ext << 18) * 400;
356 avcodec_set_dimensions(avctx, pc->width, pc->height);
357 avctx->time_base.den = pc->frame_rate * (frame_rate_ext_n + 1);
358 avctx->time_base.num = MPEG1_FRAME_RATE_BASE * (frame_rate_ext_d + 1);
359 avctx->codec_id = CODEC_ID_MPEG2VIDEO;
360 avctx->sub_id = 2; /* forces MPEG2 */
363 case 0x8: /* picture coding extension */
364 if (bytes_left >= 5) {
365 picture_structure = buf[2]&3;
366 top_field_first = buf[3] & (1 << 7);
367 repeat_first_field = buf[3] & (1 << 1);
368 progressive_frame = buf[4] & (1 << 7);
370 /* check if we must repeat the frame */
371 if (repeat_first_field) {
372 if (pc->progressive_sequence) {
377 } else if (progressive_frame) {
382 /* the packet only represents half a frame
383 XXX,FIXME maybe find a different solution */
384 if(picture_structure != 3)
394 /* we stop parsing when we encounter a slice. It ensures
395 that this function takes a negligible amount of time */
396 if (start_code >= SLICE_MIN_START_CODE &&
397 start_code <= SLICE_MAX_START_CODE)
405 static int mpegvideo_parse(AVCodecParserContext *s,
406 AVCodecContext *avctx,
407 uint8_t **poutbuf, int *poutbuf_size,
408 const uint8_t *buf, int buf_size)
410 ParseContext1 *pc1 = s->priv_data;
411 ParseContext *pc= &pc1->pc;
414 if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
417 next= ff_mpeg1_find_frame_end(pc, buf, buf_size);
419 if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
426 /* we have a full frame : we just parse the first few MPEG headers
427 to have the full timing information. The time take by this
428 function should be negligible for uncorrupted streams */
429 mpegvideo_extract_headers(s, avctx, buf, buf_size);
431 printf("pict_type=%d frame_rate=%0.3f repeat_pict=%d\n",
432 s->pict_type, (double)avctx->time_base.den / avctx->time_base.num, s->repeat_pict);
435 *poutbuf = (uint8_t *)buf;
436 *poutbuf_size = buf_size;
440 static int mpegvideo_split(AVCodecContext *avctx,
441 const uint8_t *buf, int buf_size)
446 for(i=0; i<buf_size; i++){
447 state= (state<<8) | buf[i];
448 if(state != 0x1B3 && state != 0x1B5 && state < 0x200 && state >= 0x100)
454 void ff_parse_close(AVCodecParserContext *s)
456 ParseContext *pc = s->priv_data;
461 static void parse1_close(AVCodecParserContext *s)
463 ParseContext1 *pc1 = s->priv_data;
465 av_free(pc1->pc.buffer);
469 /*************************/
472 /* XXX: make it use less memory */
473 static int av_mpeg4_decode_header(AVCodecParserContext *s1,
474 AVCodecContext *avctx,
475 const uint8_t *buf, int buf_size)
477 ParseContext1 *pc = s1->priv_data;
478 MpegEncContext *s = pc->enc;
479 GetBitContext gb1, *gb = &gb1;
483 s->current_picture_ptr = &s->current_picture;
485 if (avctx->extradata_size && pc->first_picture){
486 init_get_bits(gb, avctx->extradata, avctx->extradata_size*8);
487 ret = ff_mpeg4_decode_picture_header(s, gb);
490 init_get_bits(gb, buf, 8 * buf_size);
491 ret = ff_mpeg4_decode_picture_header(s, gb);
493 avcodec_set_dimensions(avctx, s->width, s->height);
495 s1->pict_type= s->pict_type;
496 pc->first_picture = 0;
500 static int mpeg4video_parse_init(AVCodecParserContext *s)
502 ParseContext1 *pc = s->priv_data;
504 pc->enc = av_mallocz(sizeof(MpegEncContext));
507 pc->first_picture = 1;
511 static int mpeg4video_parse(AVCodecParserContext *s,
512 AVCodecContext *avctx,
513 uint8_t **poutbuf, int *poutbuf_size,
514 const uint8_t *buf, int buf_size)
516 ParseContext *pc = s->priv_data;
519 if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
522 next= ff_mpeg4_find_frame_end(pc, buf, buf_size);
524 if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
530 av_mpeg4_decode_header(s, avctx, buf, buf_size);
532 *poutbuf = (uint8_t *)buf;
533 *poutbuf_size = buf_size;
537 #ifdef CONFIG_CAVS_DECODER
538 static int cavsvideo_parse(AVCodecParserContext *s,
539 AVCodecContext *avctx,
540 uint8_t **poutbuf, int *poutbuf_size,
541 const uint8_t *buf, int buf_size)
543 ParseContext *pc = s->priv_data;
546 if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
549 next= ff_cavs_find_frame_end(pc, buf, buf_size);
551 if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
557 *poutbuf = (uint8_t *)buf;
558 *poutbuf_size = buf_size;
561 #endif /* CONFIG_CAVS_DECODER */
563 static int mpeg4video_split(AVCodecContext *avctx,
564 const uint8_t *buf, int buf_size)
569 for(i=0; i<buf_size; i++){
570 state= (state<<8) | buf[i];
571 if(state == 0x1B3 || state == 0x1B6)
577 /*************************/
579 typedef struct MpegAudioParseContext {
580 uint8_t inbuf[MPA_MAX_CODED_FRAME_SIZE]; /* input buffer */
583 int free_format_frame_size;
584 int free_format_next_header;
587 } MpegAudioParseContext;
589 #define MPA_HEADER_SIZE 4
591 /* header + layer + bitrate + freq + lsf/mpeg25 */
592 #undef SAME_HEADER_MASK /* mpegaudio.h defines different version */
593 #define SAME_HEADER_MASK \
594 (0xffe00000 | (3 << 17) | (3 << 10) | (3 << 19))
596 static int mpegaudio_parse_init(AVCodecParserContext *s1)
598 MpegAudioParseContext *s = s1->priv_data;
599 s->inbuf_ptr = s->inbuf;
603 static int mpegaudio_parse(AVCodecParserContext *s1,
604 AVCodecContext *avctx,
605 uint8_t **poutbuf, int *poutbuf_size,
606 const uint8_t *buf, int buf_size)
608 MpegAudioParseContext *s = s1->priv_data;
611 const uint8_t *buf_ptr;
616 while (buf_size > 0) {
617 len = s->inbuf_ptr - s->inbuf;
618 if (s->frame_size == 0) {
619 /* special case for next header for first frame in free
620 format case (XXX: find a simpler method) */
621 if (s->free_format_next_header != 0) {
622 s->inbuf[0] = s->free_format_next_header >> 24;
623 s->inbuf[1] = s->free_format_next_header >> 16;
624 s->inbuf[2] = s->free_format_next_header >> 8;
625 s->inbuf[3] = s->free_format_next_header;
626 s->inbuf_ptr = s->inbuf + 4;
627 s->free_format_next_header = 0;
630 /* no header seen : find one. We need at least MPA_HEADER_SIZE
632 len = MPA_HEADER_SIZE - len;
636 memcpy(s->inbuf_ptr, buf_ptr, len);
641 if ((s->inbuf_ptr - s->inbuf) >= MPA_HEADER_SIZE) {
643 sr= avctx->sample_rate;
644 header = (s->inbuf[0] << 24) | (s->inbuf[1] << 16) |
645 (s->inbuf[2] << 8) | s->inbuf[3];
647 ret = mpa_decode_header(avctx, header);
650 /* no sync found : move by one byte (inefficient, but simple!) */
651 memmove(s->inbuf, s->inbuf + 1, s->inbuf_ptr - s->inbuf - 1);
653 dprintf("skip %x\n", header);
654 /* reset free format frame size to give a chance
655 to get a new bitrate */
656 s->free_format_frame_size = 0;
658 if((header&SAME_HEADER_MASK) != (s->header&SAME_HEADER_MASK) && s->header)
665 /* free format: prepare to compute frame size */
666 if (decode_header(s, header) == 1) {
671 if(s->header_count <= 0)
672 avctx->sample_rate= sr; //FIXME ugly
676 if (s->frame_size == -1) {
677 /* free format : find next sync to compute frame size */
678 len = MPA_MAX_CODED_FRAME_SIZE - len;
682 /* frame too long: resync */
684 memmove(s->inbuf, s->inbuf + 1, s->inbuf_ptr - s->inbuf - 1);
691 memcpy(s->inbuf_ptr, buf_ptr, len);
692 /* check for header */
693 p = s->inbuf_ptr - 3;
694 pend = s->inbuf_ptr + len - 4;
696 header = (p[0] << 24) | (p[1] << 16) |
698 header1 = (s->inbuf[0] << 24) | (s->inbuf[1] << 16) |
699 (s->inbuf[2] << 8) | s->inbuf[3];
700 /* check with high probability that we have a
702 if ((header & SAME_HEADER_MASK) ==
703 (header1 & SAME_HEADER_MASK)) {
704 /* header found: update pointers */
705 len = (p + 4) - s->inbuf_ptr;
709 /* compute frame size */
710 s->free_format_next_header = header;
711 s->free_format_frame_size = s->inbuf_ptr - s->inbuf;
712 padding = (header1 >> 9) & 1;
714 s->free_format_frame_size -= padding * 4;
716 s->free_format_frame_size -= padding;
717 dprintf("free frame size=%d padding=%d\n",
718 s->free_format_frame_size, padding);
719 decode_header(s, header1);
724 /* not found: simply increase pointers */
731 if (len < s->frame_size) {
732 if (s->frame_size > MPA_MAX_CODED_FRAME_SIZE)
733 s->frame_size = MPA_MAX_CODED_FRAME_SIZE;
734 len = s->frame_size - len;
737 memcpy(s->inbuf_ptr, buf_ptr, len);
743 if (s->frame_size > 0 &&
744 (s->inbuf_ptr - s->inbuf) >= s->frame_size) {
745 if(s->header_count > 0){
747 *poutbuf_size = s->inbuf_ptr - s->inbuf;
749 s->inbuf_ptr = s->inbuf;
754 return buf_ptr - buf;
757 /* also used for ADTS AAC */
758 typedef struct AC3ParseContext {
762 int (*sync)(const uint8_t *buf, int *channels, int *sample_rate,
763 int *bit_rate, int *samples);
764 uint8_t inbuf[8192]; /* input buffer */
767 #define AC3_HEADER_SIZE 7
768 #define AAC_HEADER_SIZE 7
770 static const int ac3_sample_rates[4] = {
771 48000, 44100, 32000, 0
774 static const int ac3_frame_sizes[64][3] = {
807 { 1024, 1114, 1536 },
808 { 1024, 1115, 1536 },
809 { 1152, 1253, 1728 },
810 { 1152, 1254, 1728 },
811 { 1280, 1393, 1920 },
812 { 1280, 1394, 1920 },
815 static const int ac3_bitrates[64] = {
816 32, 32, 40, 40, 48, 48, 56, 56, 64, 64, 80, 80, 96, 96, 112, 112,
817 128, 128, 160, 160, 192, 192, 224, 224, 256, 256, 320, 320, 384,
818 384, 448, 448, 512, 512, 576, 576, 640, 640,
821 static const int ac3_channels[8] = {
822 2, 1, 2, 3, 3, 4, 4, 5
825 static int aac_sample_rates[16] = {
826 96000, 88200, 64000, 48000, 44100, 32000,
827 24000, 22050, 16000, 12000, 11025, 8000, 7350
830 static int aac_channels[8] = {
831 0, 1, 2, 3, 4, 5, 6, 8
834 static int ac3_sync(const uint8_t *buf, int *channels, int *sample_rate,
835 int *bit_rate, int *samples)
837 unsigned int fscod, frmsizecod, acmod, bsid, lfeon;
840 init_get_bits(&bits, buf, AC3_HEADER_SIZE * 8);
842 if(get_bits(&bits, 16) != 0x0b77)
845 skip_bits(&bits, 16); /* crc */
846 fscod = get_bits(&bits, 2);
847 frmsizecod = get_bits(&bits, 6);
849 if(!ac3_sample_rates[fscod])
852 bsid = get_bits(&bits, 5);
855 skip_bits(&bits, 3); /* bsmod */
856 acmod = get_bits(&bits, 3);
857 if(acmod & 1 && acmod != 1)
858 skip_bits(&bits, 2); /* cmixlev */
860 skip_bits(&bits, 2); /* surmixlev */
862 skip_bits(&bits, 2); /* dsurmod */
863 lfeon = get_bits1(&bits);
865 *sample_rate = ac3_sample_rates[fscod];
866 *bit_rate = ac3_bitrates[frmsizecod] * 1000;
867 *channels = ac3_channels[acmod] + lfeon;
870 return ac3_frame_sizes[frmsizecod][fscod] * 2;
873 static int aac_sync(const uint8_t *buf, int *channels, int *sample_rate,
874 int *bit_rate, int *samples)
877 int size, rdb, ch, sr;
879 init_get_bits(&bits, buf, AAC_HEADER_SIZE * 8);
881 if(get_bits(&bits, 12) != 0xfff)
884 skip_bits1(&bits); /* id */
885 skip_bits(&bits, 2); /* layer */
886 skip_bits1(&bits); /* protection_absent */
887 skip_bits(&bits, 2); /* profile_objecttype */
888 sr = get_bits(&bits, 4); /* sample_frequency_index */
889 if(!aac_sample_rates[sr])
891 skip_bits1(&bits); /* private_bit */
892 ch = get_bits(&bits, 3); /* channel_configuration */
893 if(!aac_channels[ch])
895 skip_bits1(&bits); /* original/copy */
896 skip_bits1(&bits); /* home */
898 /* adts_variable_header */
899 skip_bits1(&bits); /* copyright_identification_bit */
900 skip_bits1(&bits); /* copyright_identification_start */
901 size = get_bits(&bits, 13); /* aac_frame_length */
902 skip_bits(&bits, 11); /* adts_buffer_fullness */
903 rdb = get_bits(&bits, 2); /* number_of_raw_data_blocks_in_frame */
905 *channels = aac_channels[ch];
906 *sample_rate = aac_sample_rates[sr];
907 *samples = (rdb + 1) * 1024;
908 *bit_rate = size * 8 * *sample_rate / *samples;
913 static int ac3_parse_init(AVCodecParserContext *s1)
915 AC3ParseContext *s = s1->priv_data;
916 s->inbuf_ptr = s->inbuf;
917 s->header_size = AC3_HEADER_SIZE;
922 static int aac_parse_init(AVCodecParserContext *s1)
924 AC3ParseContext *s = s1->priv_data;
925 s->inbuf_ptr = s->inbuf;
926 s->header_size = AAC_HEADER_SIZE;
931 /* also used for ADTS AAC */
932 static int ac3_parse(AVCodecParserContext *s1,
933 AVCodecContext *avctx,
934 uint8_t **poutbuf, int *poutbuf_size,
935 const uint8_t *buf, int buf_size)
937 AC3ParseContext *s = s1->priv_data;
938 const uint8_t *buf_ptr;
939 int len, sample_rate, bit_rate, channels, samples;
945 while (buf_size > 0) {
946 len = s->inbuf_ptr - s->inbuf;
947 if (s->frame_size == 0) {
948 /* no header seen : find one. We need at least s->header_size
950 len = FFMIN(s->header_size - len, buf_size);
952 memcpy(s->inbuf_ptr, buf_ptr, len);
956 if ((s->inbuf_ptr - s->inbuf) == s->header_size) {
957 len = s->sync(s->inbuf, &channels, &sample_rate, &bit_rate,
960 /* no sync found : move by one byte (inefficient, but simple!) */
961 memmove(s->inbuf, s->inbuf + 1, s->header_size - 1);
965 /* update codec info */
966 avctx->sample_rate = sample_rate;
967 /* set channels,except if the user explicitly requests 1 or 2 channels, XXX/FIXME this is a bit ugly */
968 if(avctx->codec_id == CODEC_ID_AC3){
969 if(avctx->channels!=1 && avctx->channels!=2){
970 avctx->channels = channels;
973 avctx->channels = channels;
975 avctx->bit_rate = bit_rate;
976 avctx->frame_size = samples;
980 len = FFMIN(s->frame_size - len, buf_size);
982 memcpy(s->inbuf_ptr, buf_ptr, len);
987 if(s->inbuf_ptr - s->inbuf == s->frame_size){
989 *poutbuf_size = s->frame_size;
990 s->inbuf_ptr = s->inbuf;
996 return buf_ptr - buf;
999 AVCodecParser mpegvideo_parser = {
1000 { CODEC_ID_MPEG1VIDEO, CODEC_ID_MPEG2VIDEO },
1001 sizeof(ParseContext1),
1008 AVCodecParser mpeg4video_parser = {
1010 sizeof(ParseContext1),
1011 mpeg4video_parse_init,
1017 #ifdef CONFIG_CAVS_DECODER
1018 AVCodecParser cavsvideo_parser = {
1020 sizeof(ParseContext1),
1028 AVCodecParser mpegaudio_parser = {
1029 { CODEC_ID_MP2, CODEC_ID_MP3 },
1030 sizeof(MpegAudioParseContext),
1031 mpegaudio_parse_init,
1036 AVCodecParser ac3_parser = {
1038 sizeof(AC3ParseContext),
1044 AVCodecParser aac_parser = {
1046 sizeof(AC3ParseContext),