mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-28 20:53:54 +02:00
0c79b1402a
and then reads the channel_map stuff Originally committed as revision 12944 to svn://svn.ffmpeg.org/ffmpeg/trunk
61 lines
2.2 KiB
C
61 lines
2.2 KiB
C
/*
|
|
* AC3 parser prototypes
|
|
* Copyright (c) 2003 Fabrice Bellard.
|
|
* Copyright (c) 2003 Michael Niedermayer.
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef FFMPEG_AC3_PARSER_H
|
|
#define FFMPEG_AC3_PARSER_H
|
|
|
|
#include "ac3.h"
|
|
#include "bitstream.h"
|
|
|
|
typedef enum {
|
|
AC3_PARSE_ERROR_SYNC = -1,
|
|
AC3_PARSE_ERROR_BSID = -2,
|
|
AC3_PARSE_ERROR_SAMPLE_RATE = -3,
|
|
AC3_PARSE_ERROR_FRAME_SIZE = -4,
|
|
AC3_PARSE_ERROR_FRAME_TYPE = -5,
|
|
} AC3ParseError;
|
|
|
|
/**
|
|
* Parses AC-3 frame header.
|
|
* Parses the header up to the lfeon element, which is the first 52 or 54 bits
|
|
* depending on the audio coding mode.
|
|
* @param gbc[in] BitContext containing the first 54 bits of the frame.
|
|
* @param hdr[out] Pointer to struct where header info is written.
|
|
* @return Returns 0 on success, -1 if there is a sync word mismatch,
|
|
* -2 if the bsid (version) element is invalid, -3 if the fscod (sample rate)
|
|
* element is invalid, or -4 if the frmsizecod (bit rate) element is invalid.
|
|
*/
|
|
int ff_ac3_parse_header(GetBitContext *gbc, AC3HeaderInfo *hdr);
|
|
|
|
/**
|
|
* Parses AC-3 frame header and sets channel_map
|
|
* Parses the header up to the lfeon (channel_map in E-AC-3)
|
|
* element, which is the first 52, 54 or 104 bits depending
|
|
* on the audio coding mode.
|
|
* @param gbc[in] BitContext containing the first 54 bits of the frame.
|
|
* @param hdr[out] Pointer to struct where header info is written.
|
|
* @return value returned by ff_ac3_parse_header
|
|
*/
|
|
int ff_ac3_parse_header_full(GetBitContext *gbc, AC3HeaderInfo *hdr);
|
|
|
|
#endif /* FFMPEG_AC3_PARSER_H */
|