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