Change aac and ac3 parsers to use ff_combine_frame().
[libav.git] / libavcodec / aac_ac3_parser.c
1 /*
2 * Common AAC and AC3 parser
3 * Copyright (c) 2003 Fabrice Bellard.
4 * Copyright (c) 2003 Michael Niedermayer.
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
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
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include "parser.h"
24 #include "aac_ac3_parser.h"
25
26 int ff_aac_ac3_parse(AVCodecParserContext *s1,
27 AVCodecContext *avctx,
28 const uint8_t **poutbuf, int *poutbuf_size,
29 const uint8_t *buf, int buf_size)
30 {
31 AACAC3ParseContext *s = s1->priv_data;
32 ParseContext *pc = &s->pc;
33 int len, i;
34
35 i=END_NOT_FOUND;
36 if(s->remaining_size <= buf_size){
37 if(s->remaining_size){
38 i= s->remaining_size;
39 s->remaining_size = 0;
40 }else{ //we need a header first
41 len=0;
42 for(i=s->remaining_size; i<buf_size; i++){
43 s->state = (s->state<<8) + buf[i];
44 if((len=s->sync(s->state, s)))
45 break;
46 }
47 if(len<=0){
48 i=END_NOT_FOUND;
49 }else{
50 i-= s->header_size -1;
51 s->remaining_size = len + i;
52 }
53 }
54 }
55
56 if(ff_combine_frame(pc, i, &buf, &buf_size)<0){
57 s->remaining_size -= FFMIN(s->remaining_size, buf_size);
58 *poutbuf = NULL;
59 *poutbuf_size = 0;
60 return buf_size;
61 }
62
63 *poutbuf = buf;
64 *poutbuf_size = buf_size;
65
66 /* update codec info */
67 avctx->sample_rate = s->sample_rate;
68 /* allow downmixing to stereo (or mono for AC3) */
69 if(avctx->request_channels > 0 &&
70 avctx->request_channels < s->channels &&
71 (avctx->request_channels <= 2 ||
72 (avctx->request_channels == 1 &&
73 avctx->codec_id == CODEC_ID_AC3))) {
74 avctx->channels = avctx->request_channels;
75 } else {
76 avctx->channels = s->channels;
77 }
78 avctx->bit_rate = s->bit_rate;
79 avctx->frame_size = s->samples;
80
81 return i;
82 }