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 Libav.
7 *
8 * Libav 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 * Libav 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 Libav; 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];
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      = { 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};
70