2007-05-08 23:25:31 +00:00
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/*
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* Common AAC and AC3 parser
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* Copyright (c) 2003 Fabrice Bellard.
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* Copyright (c) 2003 Michael Niedermayer.
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "parser.h"
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#include "aac_ac3_parser.h"
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2007-05-08 23:29:07 +00:00
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int ff_aac_ac3_parse(AVCodecParserContext *s1,
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2007-05-08 23:25:31 +00:00
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AVCodecContext *avctx,
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const uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size)
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{
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2007-05-08 23:29:07 +00:00
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AACAC3ParseContext *s = s1->priv_data;
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2008-04-05 20:09:36 +00:00
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ParseContext *pc = &s->pc;
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int len, i;
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2007-05-08 23:25:31 +00:00
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2008-04-05 20:09:36 +00:00
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while(s->remaining_size <= buf_size){
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if(s->remaining_size && !s->need_next_header){
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i= s->remaining_size;
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s->remaining_size = 0;
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goto output_frame;
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}else{ //we need a header first
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len=0;
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for(i=s->remaining_size; i<buf_size; i++){
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s->state = (s->state<<8) + buf[i];
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if((len=s->sync(s->state, s, &s->need_next_header, &s->new_frame_start)))
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break;
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}
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2008-04-07 20:54:08 +00:00
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i-= s->header_size -1;
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2008-04-05 20:09:36 +00:00
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if(len>0){
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s->remaining_size = len + i;
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2007-05-08 23:25:31 +00:00
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2008-04-05 20:09:36 +00:00
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if(pc->index+i > 0 && s->new_frame_start){
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s->remaining_size -= i; // remaining_size=len
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output_frame:
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2008-04-07 20:54:08 +00:00
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if(!s->frame_in_buffer && 0){
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s->frame_in_buffer=1;
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buf+=i;
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buf_size-=i;
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continue;
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}
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2008-04-05 20:09:36 +00:00
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ff_combine_frame(pc, i, &buf, &buf_size);
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*poutbuf = buf;
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*poutbuf_size = buf_size;
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2007-10-13 09:58:39 +00:00
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2007-05-08 23:25:31 +00:00
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/* update codec info */
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2008-03-23 15:43:29 +00:00
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avctx->sample_rate = s->sample_rate;
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2008-01-05 21:08:20 +00:00
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/* allow downmixing to stereo (or mono for AC3) */
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2008-01-05 05:36:00 +00:00
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if(avctx->request_channels > 0 &&
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2008-03-23 15:43:29 +00:00
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avctx->request_channels < s->channels &&
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2008-01-05 21:08:20 +00:00
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(avctx->request_channels <= 2 ||
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(avctx->request_channels == 1 &&
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avctx->codec_id == CODEC_ID_AC3))) {
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2008-01-05 05:36:00 +00:00
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avctx->channels = avctx->request_channels;
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2008-01-05 15:18:15 +00:00
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} else {
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2008-03-23 15:43:29 +00:00
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avctx->channels = s->channels;
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2008-01-05 05:36:00 +00:00
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}
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2008-03-23 15:43:29 +00:00
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avctx->bit_rate = s->bit_rate;
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avctx->frame_size = s->samples;
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2008-04-05 20:09:36 +00:00
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return i;
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2007-05-08 23:25:31 +00:00
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}
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2008-04-07 20:54:08 +00:00
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s->frame_in_buffer=1;
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2008-04-05 20:09:36 +00:00
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}else{
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2007-05-08 23:25:31 +00:00
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break;
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}
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}
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}
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2008-04-05 20:09:36 +00:00
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ff_combine_frame(pc, END_NOT_FOUND, &buf, &buf_size);
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s->remaining_size -= FFMIN(s->remaining_size, buf_size);
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*poutbuf = NULL;
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*poutbuf_size = 0;
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return buf_size;
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2007-05-08 23:25:31 +00:00
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}
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