1 /* 2 * AAC encoder intensity stereo 3 * Copyright (C) 2015 Rostislav Pehlivanov 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22 /** 23 * @file 24 * AAC encoder Intensity Stereo 25 * @author Rostislav Pehlivanov ( atomnuker gmail com ) 26 */ 27 28 #ifndef AVCODEC_AACENC_IS_H 29 #define AVCODEC_AACENC_IS_H 30 31 #include "aacenc.h" 32 33 /** Frequency in Hz for lower limit of intensity stereo **/ 34 #define INT_STEREO_LOW_LIMIT 6100 35 36 struct AACISError { 37 int pass; /* 1 if dist2 <= dist1 */ 38 int phase; /* -1 or +1 */ 39 float error; /* fabs(dist1 - dist2) */ 40 float dist1; /* From original coeffs */ 41 float dist2; /* From IS'd coeffs */ 42 float ener01; 43 }; 44 45 struct AACISError ff_aac_is_encoding_err(AACEncContext *s, ChannelElement *cpe, 46 int start, int w, int g, float ener0, 47 float ener1, float ener01, 48 int use_pcoeffs, int phase); 49 void ff_aac_search_for_is(AACEncContext *s, AVCodecContext *avctx, ChannelElement *cpe); 50 51 #endif /* AVCODEC_AACENC_IS_H */ 52