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