ac3_parser.h
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1 /*
2  * AC-3 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_AC3_PARSER_H
24 #define AVCODEC_AC3_PARSER_H
25 
26 #include "ac3.h"
27 #include "get_bits.h"
28 
29 /**
30  * Parse AC-3 frame header.
31  * Parse the header up to the lfeon element, which is the first 52 or 54 bits
32  * depending on the audio coding mode.
33  * @param[in] gbc BitContext containing the first 54 bits of the frame.
34  * @param[out] hdr Pointer to struct where header info is written.
35  * @return Returns 0 on success, -1 if there is a sync word mismatch,
36  * -2 if the bsid (version) element is invalid, -3 if the fscod (sample rate)
37  * element is invalid, or -4 if the frmsizecod (bit rate) element is invalid.
38  */
40 
41 #endif /* AVCODEC_AC3_PARSER_H */
bitstream reader API header.
Coded AC-3 header values up to the lfeon element, plus derived values.
Definition: ac3.h:96
int avpriv_ac3_parse_header(GetBitContext *gbc, AC3HeaderInfo *hdr)
Parse AC-3 frame header.
Definition: ac3_parser.c:50
Common code between the AC-3 encoder and decoder.