48 lines
1.7 KiB
C
48 lines
1.7 KiB
C
/*
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* AAC encoder intensity stereo
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* Copyright (C) 2015 Rostislav Pehlivanov
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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 encoder Intensity Stereo
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* @author Rostislav Pehlivanov ( atomnuker gmail com )
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*/
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#ifndef AVCODEC_AACENC_IS_H
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#define AVCODEC_AACENC_IS_H
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/** Frequency in Hz for lower limit of intensity stereo **/
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#define INT_STEREO_LOW_LIMIT 6100
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struct AACISError {
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int pass; /* 1 if dist2 <= dist1 */
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int phase; /* -1 or +1 */
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float error; /* fabs(dist1 - dist2) */
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float dist1; /* From original coeffs */
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float dist2; /* From IS'd coeffs */
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};
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struct AACISError ff_aac_is_encoding_err(AACEncContext *s, ChannelElement *cpe,
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int start, int w, int g, float ener0,
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float ener1, float ener01, int phase);
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void ff_aac_search_for_is(AACEncContext *s, AVCodecContext *avctx, ChannelElement *cpe);
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#endif /* AVCODEC_AACENC_IS_H */
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