aac_ac3_parser.h File Reference

#include <stdint.h>
#include "avcodec.h"
#include "parser.h"

Go to the source code of this file.

Data Structures
struct	AACAC3ParseContext
Functions
int	ff_aac_ac3_parse (AVCodecParserContext *s1, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size)

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Function Documentation

int ff_aac_ac3_parse	(	AVCodecParserContext *	s1,
		AVCodecContext *	avctx,
		const uint8_t **	poutbuf,
		int *	poutbuf_size,
		const uint8_t *	buf,
		int	buf_size
	)

Definition at line 26 of file aac_ac3_parser.c.

References AACAC3ParseContext::bit_rate, AVCodecContext::bit_rate, AVCodecContext::channels, AACAC3ParseContext::channels, AVCodecContext::codec_id, CODEC_ID_AC3, END_NOT_FOUND, ff_combine_frame(), FFMIN, AVCodecContext::frame_size, AACAC3ParseContext::header_size, len, AACAC3ParseContext::need_next_header, NULL, AACAC3ParseContext::pc, AACAC3ParseContext::remaining_size, AVCodecContext::request_channels, s1, AACAC3ParseContext::sample_rate, AVCodecContext::sample_rate, AACAC3ParseContext::samples, AACAC3ParseContext::state, and AACAC3ParseContext::sync.

{
    AACAC3ParseContext *s = s1->priv_data;
    ParseContext *pc = &s->pc;
    int len, i;
    int new_frame_start;

get_next:
    i=END_NOT_FOUND;
    if(s->remaining_size <= buf_size){
        if(s->remaining_size && !s->need_next_header){
            i= s->remaining_size;
            s->remaining_size = 0;
        }else{ //we need a header first
            len=0;
            for(i=s->remaining_size; i<buf_size; i++){
                s->state = (s->state<<8) + buf[i];
                if((len=s->sync(s->state, s, &s->need_next_header, &new_frame_start)))
                    break;
            }
            if(len<=0){
                i=END_NOT_FOUND;
            }else{
                i-= s->header_size -1;
                s->remaining_size = len;
                if(!new_frame_start){
                    s->remaining_size += i;
                    goto get_next;
                }
            }
        }
    }

    if(ff_combine_frame(pc, i, &buf, &buf_size)<0){
        s->remaining_size -= FFMIN(s->remaining_size, buf_size);
        *poutbuf = NULL;
        *poutbuf_size = 0;
        return buf_size;
    }

    *poutbuf = buf;
    *poutbuf_size = buf_size;

    /* update codec info */
    avctx->sample_rate = s->sample_rate;
    /* allow downmixing to stereo (or mono for AC3) */
    if(avctx->request_channels > 0 &&
            avctx->request_channels < s->channels &&
            (avctx->request_channels <= 2 ||
            (avctx->request_channels == 1 &&
            avctx->codec_id == CODEC_ID_AC3))) {
        avctx->channels = avctx->request_channels;
    } else {
        avctx->channels = s->channels;
    }
    avctx->bit_rate = s->bit_rate;
    avctx->frame_size = s->samples;

    return i;
}

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