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105 lines
2.9 KiB
105 lines
2.9 KiB
3 years ago
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/*
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* Common AC-3 definitions
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* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_AC3DEFS_H
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#define AVCODEC_AC3DEFS_H
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#define EAC3_MAX_CHANNELS 16 /**< maximum number of channels in EAC3 */
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#define AC3_MAX_CHANNELS 7 /**< maximum number of channels, including coupling channel */
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#define CPL_CH 0 /**< coupling channel index */
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#define AC3_MAX_COEFS 256
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#define AC3_BLOCK_SIZE 256
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#define AC3_MAX_BLOCKS 6
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#define AC3_FRAME_SIZE (AC3_MAX_BLOCKS * 256)
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#define AC3_WINDOW_SIZE (AC3_BLOCK_SIZE * 2)
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#define AC3_CRITICAL_BANDS 50
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#define AC3_MAX_CPL_BANDS 18
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/* exponent encoding strategy */
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#define EXP_REUSE 0
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#define EXP_NEW 1
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#define EXP_D15 1
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#define EXP_D25 2
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#define EXP_D45 3
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/** Delta bit allocation strategy */
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typedef enum {
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DBA_REUSE = 0,
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DBA_NEW,
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DBA_NONE,
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DBA_RESERVED
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} AC3DeltaStrategy;
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/** Channel mode (audio coding mode) */
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typedef enum {
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AC3_CHMODE_DUALMONO = 0,
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AC3_CHMODE_MONO,
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AC3_CHMODE_STEREO,
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AC3_CHMODE_3F,
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AC3_CHMODE_2F1R,
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AC3_CHMODE_3F1R,
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AC3_CHMODE_2F2R,
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AC3_CHMODE_3F2R
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} AC3ChannelMode;
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/** Dolby Surround mode */
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typedef enum AC3DolbySurroundMode {
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AC3_DSURMOD_NOTINDICATED = 0,
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AC3_DSURMOD_OFF,
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AC3_DSURMOD_ON,
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AC3_DSURMOD_RESERVED
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} AC3DolbySurroundMode;
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/** Dolby Surround EX mode */
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typedef enum AC3DolbySurroundEXMode {
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AC3_DSUREXMOD_NOTINDICATED = 0,
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AC3_DSUREXMOD_OFF,
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AC3_DSUREXMOD_ON,
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AC3_DSUREXMOD_PLIIZ
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} AC3DolbySurroundEXMode;
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/** Dolby Headphone mode */
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typedef enum AC3DolbyHeadphoneMode {
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AC3_DHEADPHONMOD_NOTINDICATED = 0,
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AC3_DHEADPHONMOD_OFF,
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AC3_DHEADPHONMOD_ON,
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AC3_DHEADPHONMOD_RESERVED
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} AC3DolbyHeadphoneMode;
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/** Preferred Stereo Downmix mode */
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typedef enum AC3PreferredStereoDownmixMode {
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AC3_DMIXMOD_NOTINDICATED = 0,
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AC3_DMIXMOD_LTRT,
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AC3_DMIXMOD_LORO,
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AC3_DMIXMOD_DPLII // reserved value in A/52, but used by encoders to indicate DPL2
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} AC3PreferredStereoDownmixMode;
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typedef enum {
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EAC3_FRAME_TYPE_INDEPENDENT = 0,
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EAC3_FRAME_TYPE_DEPENDENT,
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EAC3_FRAME_TYPE_AC3_CONVERT,
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EAC3_FRAME_TYPE_RESERVED
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} EAC3FrameType;
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#endif /* AVCODEC_AC3DEFS_H */
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