mirror of https://github.com/FFmpeg/FFmpeg.git
code Originally committed as revision 14624 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
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/*
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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 aac.h |
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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 FFMPEG_AAC_H |
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#define FFMPEG_AAC_H |
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#include "avcodec.h" |
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#include "dsputil.h" |
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#include "mpeg4audio.h" |
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#include <stdint.h> |
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#define AAC_INIT_VLC_STATIC(num, size) \ |
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INIT_VLC_STATIC(&vlc_spectral[num], 6, ff_aac_spectral_sizes[num], \
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ff_aac_spectral_bits[num], sizeof( ff_aac_spectral_bits[num][0]), sizeof( ff_aac_spectral_bits[num][0]), \
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ff_aac_spectral_codes[num], sizeof(ff_aac_spectral_codes[num][0]), sizeof(ff_aac_spectral_codes[num][0]), \
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size); |
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#define IVQUANT_SIZE 1024 |
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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 ChannelType { |
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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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/**
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* main AAC context |
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*/ |
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typedef struct { |
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AVCodecContext * avccontext; |
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/**
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* @defgroup tables Computed / set up during initialization. |
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* @{ |
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*/ |
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MDCTContext mdct; |
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MDCTContext mdct_small; |
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DSPContext dsp; |
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/** @} */ |
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/**
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* @defgroup output Members used for output interleaving and down-mixing. |
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* @{ |
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*/ |
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float add_bias; ///< offset for dsp.float_to_int16
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float sf_scale; ///< Pre-scale for correct IMDCT and dsp.float_to_int16.
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int sf_offset; ///< offset into pow2sf_tab as appropriate for dsp.float_to_int16
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/** @} */ |
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} AACContext; |
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#endif /* FFMPEG_AAC_H */ |
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