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 * Parses AC-3 frame header.
31 * Parses the header up to the lfeon element, which is the first 52 or 54 bits
32 * depending on the audio coding mode.
33 * @param gbc[in] BitContext containing the first 54 bits of the frame.
34 * @param hdr[out] 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 */
39int ff_ac3_parse_header(GetBitContext *gbc, AC3HeaderInfo *hdr);
40
41/**
42 * Parses AC-3 frame header and sets channel_map
43 * Parses the header up to the lfeon (channel_map in E-AC-3)
44 * element, which is the first 52, 54 or 104 bits depending
45 * on the audio coding mode.
46 * @param gbc[in] BitContext containing the first 54 bits of the frame.
47 * @param hdr[out] Pointer to struct where header info is written.
48 * @return value returned by ff_ac3_parse_header
49 */
50int ff_ac3_parse_header_full(GetBitContext *gbc, AC3HeaderInfo *hdr);
51
52#endif /* AVCODEC_AC3_PARSER_H */
53