mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
106 lines
3.4 KiB
106 lines
3.4 KiB
/* |
|
* AAC definitions and structures |
|
* Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org ) |
|
* Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov gmail com ) |
|
* |
|
* 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 |
|
*/ |
|
|
|
/** |
|
* @file |
|
* AAC definitions and structures |
|
* @author Oded Shimon ( ods15 ods15 dyndns org ) |
|
* @author Maxim Gavrilov ( maxim.gavrilov gmail com ) |
|
*/ |
|
|
|
#ifndef AVCODEC_AAC_H |
|
#define AVCODEC_AAC_H |
|
|
|
#define MAX_CHANNELS 64 |
|
#define MAX_ELEM_ID 16 |
|
|
|
#define TNS_MAX_ORDER 20 |
|
#define MAX_LTP_LONG_SFB 40 |
|
|
|
enum RawDataBlockType { |
|
TYPE_SCE, |
|
TYPE_CPE, |
|
TYPE_CCE, |
|
TYPE_LFE, |
|
TYPE_DSE, |
|
TYPE_PCE, |
|
TYPE_FIL, |
|
TYPE_END, |
|
}; |
|
|
|
enum ExtensionPayloadID { |
|
EXT_FILL, |
|
EXT_FILL_DATA, |
|
EXT_DATA_ELEMENT, |
|
EXT_DYNAMIC_RANGE = 0xb, |
|
EXT_SBR_DATA = 0xd, |
|
EXT_SBR_DATA_CRC = 0xe, |
|
}; |
|
|
|
enum WindowSequence { |
|
ONLY_LONG_SEQUENCE, |
|
LONG_START_SEQUENCE, |
|
EIGHT_SHORT_SEQUENCE, |
|
LONG_STOP_SEQUENCE, |
|
}; |
|
|
|
enum BandType { |
|
ZERO_BT = 0, ///< Scalefactors and spectral data are all zero. |
|
FIRST_PAIR_BT = 5, ///< This and later band types encode two values (rather than four) with one code word. |
|
ESC_BT = 11, ///< Spectral data are coded with an escape sequence. |
|
RESERVED_BT = 12, ///< Band types following are encoded differently from others. |
|
NOISE_BT = 13, ///< Spectral data are scaled white noise not coded in the bitstream. |
|
INTENSITY_BT2 = 14, ///< Scalefactor data are intensity stereo positions (out of phase). |
|
INTENSITY_BT = 15, ///< Scalefactor data are intensity stereo positions (in phase). |
|
}; |
|
|
|
enum ChannelPosition { |
|
AAC_CHANNEL_OFF = 0, |
|
AAC_CHANNEL_FRONT = 1, |
|
AAC_CHANNEL_SIDE = 2, |
|
AAC_CHANNEL_BACK = 3, |
|
AAC_CHANNEL_LFE = 4, |
|
AAC_CHANNEL_CC = 5, |
|
}; |
|
|
|
#define MAX_PREDICTORS 672 |
|
|
|
#define SCALE_DIV_512 36 ///< scalefactor difference that corresponds to scale difference in 512 times |
|
#define SCALE_ONE_POS 140 ///< scalefactor index that corresponds to scale=1.0 |
|
#define SCALE_MAX_POS 255 ///< scalefactor index maximum value |
|
#define SCALE_MAX_DIFF 60 ///< maximum scalefactor difference allowed by standard |
|
#define SCALE_DIFF_ZERO 60 ///< codebook index corresponding to zero scalefactor indices difference |
|
|
|
#define POW_SF2_ZERO 200 ///< ff_aac_pow2sf_tab index corresponding to pow(2, 0); |
|
|
|
#define NOISE_PRE 256 ///< preamble for NOISE_BT, put in bitstream with the first noise band |
|
#define NOISE_PRE_BITS 9 ///< length of preamble |
|
#define NOISE_OFFSET 90 ///< subtracted from global gain, used as offset for the preamble |
|
|
|
typedef struct Pulse { |
|
int num_pulse; |
|
int start; |
|
int pos[4]; |
|
int amp[4]; |
|
} Pulse; |
|
|
|
#endif /* AVCODEC_AAC_H */
|
|
|