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