1/*
2 * AAC ADTS header decoding prototypes and structures
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_ADTS_HEADER_H
24#define AVCODEC_ADTS_HEADER_H
25
26#include "get_bits.h"
27
28typedef struct AACADTSHeaderInfo {
29    uint32_t sample_rate;
30    uint32_t samples;
31    uint32_t bit_rate;
32    uint8_t  crc_absent;
33    uint8_t  object_type;
34    uint8_t  sampling_index;
35    uint8_t  chan_config;
36    uint8_t  num_aac_frames;
37    uint32_t frame_length;
38} AACADTSHeaderInfo;
39
40/**
41 * Parse the ADTS frame header to the end of the variable header, which is
42 * the first 54 bits.
43 * @param[in]  gbc BitContext containing the first 54 bits of the frame.
44 * @param[out] hdr Pointer to struct where header info is written.
45 * @return Returns 0 on success, -1 if there is a sync word mismatch,
46 * -2 if the version element is invalid, -3 if the sample rate
47 * element is invalid, or -4 if the bit rate element is invalid.
48 */
49int ff_adts_header_parse(GetBitContext *gbc, AACADTSHeaderInfo *hdr);
50
51/**
52 * Parse the ADTS frame header contained in the buffer, which is
53 * the first 54 bits.
54 * @param[in]  buf  Pointer to buffer containing the first 54 bits of the frame.
55 * @param[in]  size Size of buffer containing the first 54 bits of the frame.
56 * @param[out] phdr Pointer to pointer to struct AACADTSHeaderInfo for which
57 * memory is allocated and header info is written into it. After using the header
58 * information, the allocated memory must be freed by using av_free.
59 * @return Returns 0 on success, -1 if there is a sync word mismatch,
60 * -2 if the version element is invalid, -3 if the sample rate
61 * element is invalid, or -4 if the bit rate element is invalid.
62 */
63int avpriv_adts_header_parse(AACADTSHeaderInfo **phdr, const uint8_t *buf, size_t size);
64
65#endif /* AVCODEC_ADTS_HEADER_H */
66