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/*
* Common AC-3 definitions
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
*
* 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 AVCODEC_AC3DEFS_H
#define AVCODEC_AC3DEFS_H
#define EAC3_MAX_CHANNELS 16 /**< maximum number of channels in EAC3 */
#define AC3_MAX_CHANNELS 7 /**< maximum number of channels, including coupling channel */
#define CPL_CH 0 /**< coupling channel index */
#define AC3_MAX_COEFS 256
#define AC3_BLOCK_SIZE 256
#define AC3_MAX_BLOCKS 6
#define AC3_FRAME_SIZE (AC3_MAX_BLOCKS * 256)
#define AC3_WINDOW_SIZE (AC3_BLOCK_SIZE * 2)
#define AC3_CRITICAL_BANDS 50
#define AC3_MAX_CPL_BANDS 18
/* exponent encoding strategy */
#define EXP_REUSE 0
#define EXP_NEW 1
#define EXP_D15 1
#define EXP_D25 2
#define EXP_D45 3
/** Delta bit allocation strategy */
typedef enum {
DBA_REUSE = 0,
DBA_NEW,
DBA_NONE,
DBA_RESERVED
} AC3DeltaStrategy;
/** Channel mode (audio coding mode) */
typedef enum {
AC3_CHMODE_DUALMONO = 0,
AC3_CHMODE_MONO,
AC3_CHMODE_STEREO,
AC3_CHMODE_3F,
AC3_CHMODE_2F1R,
AC3_CHMODE_3F1R,
AC3_CHMODE_2F2R,
AC3_CHMODE_3F2R
} AC3ChannelMode;
/** Dolby Surround mode */
typedef enum AC3DolbySurroundMode {
AC3_DSURMOD_NOTINDICATED = 0,
AC3_DSURMOD_OFF,
AC3_DSURMOD_ON,
AC3_DSURMOD_RESERVED
} AC3DolbySurroundMode;
/** Dolby Surround EX mode */
typedef enum AC3DolbySurroundEXMode {
AC3_DSUREXMOD_NOTINDICATED = 0,
AC3_DSUREXMOD_OFF,
AC3_DSUREXMOD_ON,
AC3_DSUREXMOD_PLIIZ
} AC3DolbySurroundEXMode;
/** Dolby Headphone mode */
typedef enum AC3DolbyHeadphoneMode {
AC3_DHEADPHONMOD_NOTINDICATED = 0,
AC3_DHEADPHONMOD_OFF,
AC3_DHEADPHONMOD_ON,
AC3_DHEADPHONMOD_RESERVED
} AC3DolbyHeadphoneMode;
/** Preferred Stereo Downmix mode */
typedef enum AC3PreferredStereoDownmixMode {
AC3_DMIXMOD_NOTINDICATED = 0,
AC3_DMIXMOD_LTRT,
AC3_DMIXMOD_LORO,
AC3_DMIXMOD_DPLII // reserved value in A/52, but used by encoders to indicate DPL2
} AC3PreferredStereoDownmixMode;
typedef enum {
EAC3_FRAME_TYPE_INDEPENDENT = 0,
EAC3_FRAME_TYPE_DEPENDENT,
EAC3_FRAME_TYPE_AC3_CONVERT,
EAC3_FRAME_TYPE_RESERVED
} EAC3FrameType;
#endif /* AVCODEC_AC3DEFS_H */
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