Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / aac_parser.c
CommitLineData
2ba45a60
DM
1/*
2 * Audio and Video frame extraction
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#include "aacadtsdec.h"
26#include "get_bits.h"
27#include "mpeg4audio.h"
28
29static int aac_sync(uint64_t state, AACAC3ParseContext *hdr_info,
30 int *need_next_header, int *new_frame_start)
31{
32 GetBitContext bits;
33 AACADTSHeaderInfo hdr;
34 int size;
35 union {
36 uint64_t u64;
37 uint8_t u8[8 + FF_INPUT_BUFFER_PADDING_SIZE];
38 } tmp;
39
40 tmp.u64 = av_be2ne64(state);
41 init_get_bits(&bits, tmp.u8+8-AAC_ADTS_HEADER_SIZE, AAC_ADTS_HEADER_SIZE * 8);
42
43 if ((size = avpriv_aac_parse_header(&bits, &hdr)) < 0)
44 return 0;
45 *need_next_header = 0;
46 *new_frame_start = 1;
47 hdr_info->sample_rate = hdr.sample_rate;
48 hdr_info->channels = ff_mpeg4audio_channels[hdr.chan_config];
49 hdr_info->samples = hdr.samples;
50 hdr_info->bit_rate = hdr.bit_rate;
51 return size;
52}
53
54static av_cold int aac_parse_init(AVCodecParserContext *s1)
55{
56 AACAC3ParseContext *s = s1->priv_data;
57 s->header_size = AAC_ADTS_HEADER_SIZE;
58 s->sync = aac_sync;
59 return 0;
60}
61
62
63AVCodecParser ff_aac_parser = {
64 .codec_ids = { AV_CODEC_ID_AAC },
65 .priv_data_size = sizeof(AACAC3ParseContext),
66 .parser_init = aac_parse_init,
67 .parser_parse = ff_aac_ac3_parse,
68 .parser_close = ff_parse_close,
69};