281 lines
10 KiB
C
281 lines
10 KiB
C
/*
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* Copyright (C) 2011 Michael Niedermayer (michaelni@gmx.at)
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*
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* This file is part of libswresample
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*
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* libswresample 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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* libswresample 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 libswresample; 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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#include "swresample_internal.h"
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#include "libavutil/audioconvert.h"
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#include "libavutil/avassert.h"
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#define ONE (1.0)
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#define R(x) x
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#define SAMPLE float
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#define RENAME(x) x ## _float
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#include "rematrix_template.c"
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#undef SAMPLE
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#undef RENAME
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#undef R
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#undef ONE
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#define ONE (-32768)
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#define R(x) (((x) + 16384)>>15)
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#define SAMPLE int16_t
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#define RENAME(x) x ## _s16
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#include "rematrix_template.c"
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#define FRONT_LEFT 0
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#define FRONT_RIGHT 1
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#define FRONT_CENTER 2
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#define LOW_FREQUENCY 3
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#define BACK_LEFT 4
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#define BACK_RIGHT 5
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#define FRONT_LEFT_OF_CENTER 6
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#define FRONT_RIGHT_OF_CENTER 7
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#define BACK_CENTER 8
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#define SIDE_LEFT 9
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#define SIDE_RIGHT 10
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#define TOP_CENTER 11
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#define TOP_FRONT_LEFT 12
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#define TOP_FRONT_CENTER 13
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#define TOP_FRONT_RIGHT 14
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#define TOP_BACK_LEFT 15
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#define TOP_BACK_CENTER 16
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#define TOP_BACK_RIGHT 17
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static int even(int64_t layout){
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if(!layout) return 1;
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if(layout&(layout-1)) return 1;
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return 0;
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}
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static int sane_layout(int64_t layout){
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if(!(layout & AV_CH_LAYOUT_SURROUND)) // at least 1 front speaker
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return 0;
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if(!even(layout & (AV_CH_FRONT_LEFT | AV_CH_FRONT_RIGHT))) // no asymetric front
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return 0;
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if(!even(layout & (AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT))) // no asymetric side
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return 0;
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if(!even(layout & (AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT)))
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return 0;
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if(!even(layout & (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)))
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return 0;
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if(av_get_channel_layout_nb_channels(layout) >= SWR_CH_MAX)
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return 0;
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return 1;
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}
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int swr_rematrix_init(SwrContext *s){
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int i, j, in_i, out_i;
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double matrix[64][64]={0};
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int64_t unaccounted= s->in_ch_layout & ~s->out_ch_layout;
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double maxcoef=0;
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for(i=0; i<64; i++){
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if(s->in_ch_layout & s->out_ch_layout & (1LL<<i))
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matrix[i][i]= 1.0;
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}
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if(!sane_layout(s->in_ch_layout)){
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av_log(s, AV_LOG_ERROR, "Input channel layout isnt supported\n");
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return AVERROR(EINVAL);
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}
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if(!sane_layout(s->out_ch_layout)){
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av_log(s, AV_LOG_ERROR, "Output channel layout isnt supported\n");
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return AVERROR(EINVAL);
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}
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//FIXME implement dolby surround
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//FIXME implement full ac3
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if(unaccounted & AV_CH_FRONT_CENTER){
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if((s->out_ch_layout & AV_CH_LAYOUT_STEREO) == AV_CH_LAYOUT_STEREO){
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matrix[ FRONT_LEFT][FRONT_CENTER]+= M_SQRT1_2;
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matrix[FRONT_RIGHT][FRONT_CENTER]+= M_SQRT1_2;
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}else
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av_assert0(0);
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}
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if(unaccounted & AV_CH_LAYOUT_STEREO){
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if(s->out_ch_layout & AV_CH_FRONT_CENTER){
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matrix[FRONT_CENTER][ FRONT_LEFT]+= M_SQRT1_2;
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matrix[FRONT_CENTER][FRONT_RIGHT]+= M_SQRT1_2;
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if(s->in_ch_layout & AV_CH_FRONT_CENTER)
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matrix[FRONT_CENTER][ FRONT_CENTER] = s->clev*sqrt(2);
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}else
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av_assert0(0);
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}
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if(unaccounted & AV_CH_BACK_CENTER){
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if(s->out_ch_layout & AV_CH_BACK_LEFT){
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matrix[ BACK_LEFT][BACK_CENTER]+= M_SQRT1_2;
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matrix[BACK_RIGHT][BACK_CENTER]+= M_SQRT1_2;
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}else if(s->out_ch_layout & AV_CH_SIDE_LEFT){
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matrix[ SIDE_LEFT][BACK_CENTER]+= M_SQRT1_2;
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matrix[SIDE_RIGHT][BACK_CENTER]+= M_SQRT1_2;
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}else if(s->out_ch_layout & AV_CH_FRONT_LEFT){
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matrix[ FRONT_LEFT][BACK_CENTER]+= s->slev*M_SQRT1_2;
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matrix[FRONT_RIGHT][BACK_CENTER]+= s->slev*M_SQRT1_2;
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}else if(s->out_ch_layout & AV_CH_FRONT_CENTER){
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matrix[ FRONT_CENTER][BACK_CENTER]+= s->slev*M_SQRT1_2;
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}else
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av_assert0(0);
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}
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if(unaccounted & AV_CH_BACK_LEFT){
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if(s->out_ch_layout & AV_CH_BACK_CENTER){
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matrix[BACK_CENTER][ BACK_LEFT]+= M_SQRT1_2;
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matrix[BACK_CENTER][BACK_RIGHT]+= M_SQRT1_2;
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}else if(s->out_ch_layout & AV_CH_SIDE_LEFT){
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if(s->in_ch_layout & AV_CH_SIDE_LEFT){
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matrix[ SIDE_LEFT][ BACK_LEFT]+= M_SQRT1_2;
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matrix[SIDE_RIGHT][BACK_RIGHT]+= M_SQRT1_2;
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}else{
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matrix[ SIDE_LEFT][ BACK_LEFT]+= 1.0;
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matrix[SIDE_RIGHT][BACK_RIGHT]+= 1.0;
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}
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}else if(s->out_ch_layout & AV_CH_FRONT_LEFT){
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matrix[ FRONT_LEFT][ BACK_LEFT]+= s->slev;
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matrix[FRONT_RIGHT][BACK_RIGHT]+= s->slev;
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}else if(s->out_ch_layout & AV_CH_FRONT_CENTER){
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matrix[ FRONT_CENTER][BACK_LEFT ]+= s->slev*M_SQRT1_2;
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matrix[ FRONT_CENTER][BACK_RIGHT]+= s->slev*M_SQRT1_2;
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}else
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av_assert0(0);
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}
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if(unaccounted & AV_CH_SIDE_LEFT){
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if(s->out_ch_layout & AV_CH_BACK_LEFT){
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matrix[ BACK_LEFT][ SIDE_LEFT]+= 1.0;
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matrix[BACK_RIGHT][SIDE_RIGHT]+= 1.0;
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}else if(s->out_ch_layout & AV_CH_BACK_CENTER){
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matrix[BACK_CENTER][ SIDE_LEFT]+= M_SQRT1_2;
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matrix[BACK_CENTER][SIDE_RIGHT]+= M_SQRT1_2;
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}else if(s->out_ch_layout & AV_CH_FRONT_LEFT){
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matrix[ FRONT_LEFT][ SIDE_LEFT]+= s->slev;
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matrix[FRONT_RIGHT][SIDE_RIGHT]+= s->slev;
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}else if(s->out_ch_layout & AV_CH_FRONT_CENTER){
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matrix[ FRONT_CENTER][SIDE_LEFT ]+= s->slev*M_SQRT1_2;
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matrix[ FRONT_CENTER][SIDE_RIGHT]+= s->slev*M_SQRT1_2;
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}else
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av_assert0(0);
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}
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if(unaccounted & AV_CH_FRONT_LEFT_OF_CENTER){
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if(s->out_ch_layout & AV_CH_FRONT_LEFT){
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matrix[ FRONT_LEFT][ FRONT_LEFT_OF_CENTER]+= 1.0;
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matrix[FRONT_RIGHT][FRONT_RIGHT_OF_CENTER]+= 1.0;
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}else if(s->out_ch_layout & AV_CH_FRONT_CENTER){
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matrix[ FRONT_CENTER][ FRONT_LEFT_OF_CENTER]+= M_SQRT1_2;
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matrix[ FRONT_CENTER][FRONT_RIGHT_OF_CENTER]+= M_SQRT1_2;
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}else
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av_assert0(0);
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}
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//FIXME quantize for integeres
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for(out_i=i=0; i<64; i++){
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double sum=0;
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int in_i=0;
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int ch_in=0;
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for(j=0; j<64; j++){
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s->matrix[out_i][in_i]= matrix[i][j];
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s->matrix16[out_i][in_i]= lrintf(matrix[i][j] * 32768);
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if(matrix[i][j]){
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s->matrix_ch[out_i][++ch_in]= in_i;
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sum += fabs(matrix[i][j]);
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}
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if(s->in_ch_layout & (1ULL<<j))
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in_i++;
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}
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s->matrix_ch[out_i][0]= ch_in;
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maxcoef= FFMAX(maxcoef, sum);
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if(s->out_ch_layout & (1ULL<<i))
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out_i++;
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}
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if(( s->out_sample_fmt < AV_SAMPLE_FMT_FLT
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|| s->int_sample_fmt < AV_SAMPLE_FMT_FLT) && maxcoef > 1.0){
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for(i=0; i<SWR_CH_MAX; i++)
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for(j=0; j<SWR_CH_MAX; j++){
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s->matrix[i][j] /= maxcoef;
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s->matrix16[i][j]= lrintf(s->matrix[i][j] * 32768);
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}
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}
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for(i=0; i<av_get_channel_layout_nb_channels(s->out_ch_layout); i++){
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for(j=0; j<av_get_channel_layout_nb_channels(s->in_ch_layout); j++){
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av_log(NULL, AV_LOG_ERROR, "%f ", s->matrix[i][j]);
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}
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av_log(NULL, AV_LOG_ERROR, "\n");
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}
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return 0;
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}
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int swr_rematrix(SwrContext *s, AudioData *out, AudioData *in, int len, int mustcopy){
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int out_i, in_i, i, j;
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av_assert0(out->ch_count == av_get_channel_layout_nb_channels(s->out_ch_layout));
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av_assert0(in ->ch_count == av_get_channel_layout_nb_channels(s-> in_ch_layout));
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for(out_i=0; out_i<out->ch_count; out_i++){
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switch(s->matrix_ch[out_i][0]){
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case 1:
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in_i= s->matrix_ch[out_i][1];
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if(mustcopy || s->matrix[out_i][in_i]!=1.0){
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if(s->int_sample_fmt == AV_SAMPLE_FMT_FLT){
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copy_float(out->ch[out_i], in->ch[in_i], s->matrix[out_i][in_i], len);
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}else
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copy_s16 (out->ch[out_i], in->ch[in_i], s->matrix16[out_i][in_i], len);
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}else{
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out->ch[out_i]= in->ch[in_i];
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}
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break;
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case 2:
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if(s->int_sample_fmt == AV_SAMPLE_FMT_FLT){
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sum2_float(out->ch[out_i], in->ch[ s->matrix_ch[out_i][1] ], in->ch[ s->matrix_ch[out_i][2] ],
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s->matrix[out_i][ s->matrix_ch[out_i][1] ], s->matrix[out_i][ s->matrix_ch[out_i][2] ],
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len);
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}else{
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sum2_s16 (out->ch[out_i], in->ch[ s->matrix_ch[out_i][1] ], in->ch[ s->matrix_ch[out_i][2] ],
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s->matrix16[out_i][ s->matrix_ch[out_i][1] ], s->matrix16[out_i][ s->matrix_ch[out_i][2] ],
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len);
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}
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break;
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default:
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if(s->int_sample_fmt == AV_SAMPLE_FMT_FLT){
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for(i=0; i<len; i++){
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float v=0;
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for(j=0; j<s->matrix_ch[out_i][0]; j++){
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in_i= s->matrix_ch[out_i][1+j];
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v+= ((float*)in->ch[in_i])[i] * s->matrix[out_i][in_i];
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}
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((float*)out->ch[out_i])[i]= v;
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}
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}else{
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for(i=0; i<len; i++){
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int v=0;
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for(j=0; j<s->matrix_ch[out_i][0]; j++){
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in_i= s->matrix_ch[out_i][1+j];
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v+= ((int16_t*)in->ch[in_i])[i] * s->matrix16[out_i][in_i];
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}
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((int16_t*)out->ch[out_i])[i]= (v + 16384)>>15;
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}
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}
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}
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}
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return 0;
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}
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