1/*
2 * AAC parser prototypes
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#ifndef AVCODEC_AAC_PARSER_H
24#define AVCODEC_AAC_PARSER_H
25
26#include <stdint.h>
27#include "aac_ac3_parser.h"
28#include "get_bits.h"
29
30#define AAC_ADTS_HEADER_SIZE 7
31
32typedef struct {
33    uint32_t sample_rate;
34    uint32_t samples;
35    uint32_t bit_rate;
36    uint8_t  crc_absent;
37    uint8_t  object_type;
38    uint8_t  sampling_index;
39    uint8_t  chan_config;
40    uint8_t  num_aac_frames;
41} AACADTSHeaderInfo;
42
43/**
44 * Parses AAC frame header.
45 * Parses the ADTS frame header to the end of the variable header, which is
46 * the first 54 bits.
47 * @param gbc[in] BitContext containing the first 54 bits of the frame.
48 * @param hdr[out] Pointer to struct where header info is written.
49 * @return Returns 0 on success, -1 if there is a sync word mismatch,
50 * -2 if the version element is invalid, -3 if the sample rate
51 * element is invalid, or -4 if the bit rate element is invalid.
52 */
53int ff_aac_parse_header(GetBitContext *gbc, AACADTSHeaderInfo *hdr);
54
55#endif /* AVCODEC_AAC_PARSER_H */
56