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ffmpeg/libswresample/rematrix.c

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Add libswresample. Similar to libswscale this does resampling and format convertion, just for audio instead of video. changing sampling rate, sample formats, channel layouts and sample packing all in one with a very simple public interface. Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2011-09-19 04:13:30 +00:00
/*
* Copyright (C) 2011 Michael Niedermayer (michaelni@gmx.at)
*
* This file is part of libswresample
*
* libswresample 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.
*
* libswresample 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 libswresample; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "swresample_internal.h"
#include "libavutil/audioconvert.h"
#include "libavutil/avassert.h"
#define SAMPLE float
#define RENAME(x) x ## _float
#include "rematrix_template.c"
#undef SAMPLE
#undef RENAME
#define SAMPLE int16_t
#define RENAME(x) x ## _s16
#include "rematrix_template.c"
#define FRONT_LEFT 0
#define FRONT_RIGHT 1
#define FRONT_CENTER 2
#define LOW_FREQUENCY 3
#define BACK_LEFT 4
#define BACK_RIGHT 5
#define FRONT_LEFT_OF_CENTER 6
#define FRONT_RIGHT_OF_CENTER 7
#define BACK_CENTER 8
#define SIDE_LEFT 9
#define SIDE_RIGHT 10
#define TOP_CENTER 11
#define TOP_FRONT_LEFT 12
#define TOP_FRONT_CENTER 13
#define TOP_FRONT_RIGHT 14
#define TOP_BACK_LEFT 15
#define TOP_BACK_CENTER 16
#define TOP_BACK_RIGHT 17
static int even(int64_t layout){
if(!layout) return 1;
if(layout&(layout-1)) return 1;
return 0;
}
static int sane_layout(int64_t layout){
if(!(layout & AV_CH_LAYOUT_SURROUND)) // at least 1 front speaker
return 0;
if(!even(layout & (AV_CH_FRONT_LEFT | AV_CH_FRONT_RIGHT))) // no asymetric front
return 0;
if(!even(layout & (AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT))) // no asymetric side
return 0;
if(!even(layout & (AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT)))
return 0;
if(!even(layout & (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)))
return 0;
if(av_get_channel_layout_nb_channels(layout) >= SWR_CH_MAX)
return 0;
return 1;
}
int swr_rematrix_init(SwrContext *s){
int i, j, in_i, out_i;
float matrix[64][64]={0};
int64_t unaccounted= s->in_ch_layout & ~s->out_ch_layout;
float maxcoef=0;
for(i=0; i<64; i++){
if(s->in_ch_layout & s->out_ch_layout & (1LL<<i))
matrix[i][i]= 1.0;
}
if(!sane_layout(s->in_ch_layout)){
av_log(s, AV_LOG_ERROR, "Input channel layout isnt supported\n");
return AVERROR(EINVAL);
}
if(!sane_layout(s->out_ch_layout)){
av_log(s, AV_LOG_ERROR, "Output channel layout isnt supported\n");
return AVERROR(EINVAL);
}
//FIXME implement dolby surround
//FIXME implement full ac3
if(unaccounted & AV_CH_FRONT_CENTER){
if((s->out_ch_layout & AV_CH_LAYOUT_STEREO) == AV_CH_LAYOUT_STEREO){
matrix[ FRONT_LEFT][FRONT_CENTER]+= sqrt(0.5);
matrix[FRONT_RIGHT][FRONT_CENTER]+= sqrt(0.5);
}else
av_assert0(0);
}
if(unaccounted & AV_CH_LAYOUT_STEREO){
if(s->out_ch_layout & AV_CH_FRONT_CENTER){
matrix[FRONT_CENTER][ FRONT_LEFT]+= sqrt(0.5);
matrix[FRONT_CENTER][FRONT_RIGHT]+= sqrt(0.5);
if(s->in_ch_layout & AV_CH_FRONT_CENTER)
matrix[FRONT_CENTER][ FRONT_CENTER] = s->clev*sqrt(2);
}else
av_assert0(0);
}
if(unaccounted & AV_CH_BACK_CENTER){
if(s->out_ch_layout & AV_CH_BACK_LEFT){
matrix[ BACK_LEFT][BACK_CENTER]+= sqrt(0.5);
matrix[BACK_RIGHT][BACK_CENTER]+= sqrt(0.5);
}else if(s->out_ch_layout & AV_CH_SIDE_LEFT){
matrix[ SIDE_LEFT][BACK_CENTER]+= sqrt(0.5);
matrix[SIDE_RIGHT][BACK_CENTER]+= sqrt(0.5);
}else if(s->out_ch_layout & AV_CH_FRONT_LEFT){
matrix[ FRONT_LEFT][BACK_CENTER]+= s->slev*sqrt(0.5);
matrix[FRONT_RIGHT][BACK_CENTER]+= s->slev*sqrt(0.5);
}else if(s->out_ch_layout & AV_CH_FRONT_CENTER){
matrix[ FRONT_CENTER][BACK_CENTER]+= s->slev*sqrt(0.5);
}else
av_assert0(0);
}
if(unaccounted & AV_CH_BACK_LEFT){
if(s->out_ch_layout & AV_CH_BACK_CENTER){
matrix[BACK_CENTER][ BACK_LEFT]+= sqrt(0.5);
matrix[BACK_CENTER][BACK_RIGHT]+= sqrt(0.5);
}else if(s->out_ch_layout & AV_CH_SIDE_LEFT){
if(s->in_ch_layout & AV_CH_SIDE_LEFT){
matrix[ SIDE_LEFT][ BACK_LEFT]+= sqrt(0.5);
matrix[SIDE_RIGHT][BACK_RIGHT]+= sqrt(0.5);
}else{
matrix[ SIDE_LEFT][ BACK_LEFT]+= 1.0;
matrix[SIDE_RIGHT][BACK_RIGHT]+= 1.0;
}
}else if(s->out_ch_layout & AV_CH_FRONT_LEFT){
matrix[ FRONT_LEFT][ BACK_LEFT]+= s->slev;
matrix[FRONT_RIGHT][BACK_RIGHT]+= s->slev;
}else if(s->out_ch_layout & AV_CH_FRONT_CENTER){
matrix[ FRONT_CENTER][BACK_LEFT ]+= s->slev*sqrt(0.5);
matrix[ FRONT_CENTER][BACK_RIGHT]+= s->slev*sqrt(0.5);
}else
av_assert0(0);
}
if(unaccounted & AV_CH_SIDE_LEFT){
if(s->out_ch_layout & AV_CH_BACK_LEFT){
matrix[ BACK_LEFT][ SIDE_LEFT]+= 1.0;
matrix[BACK_RIGHT][SIDE_RIGHT]+= 1.0;
}else if(s->out_ch_layout & AV_CH_BACK_CENTER){
matrix[BACK_CENTER][ SIDE_LEFT]+= sqrt(0.5);
matrix[BACK_CENTER][SIDE_RIGHT]+= sqrt(0.5);
}else if(s->out_ch_layout & AV_CH_FRONT_LEFT){
matrix[ FRONT_LEFT][ SIDE_LEFT]+= s->slev;
matrix[FRONT_RIGHT][SIDE_RIGHT]+= s->slev;
}else if(s->out_ch_layout & AV_CH_FRONT_CENTER){
matrix[ FRONT_CENTER][SIDE_LEFT ]+= s->slev*sqrt(0.5);
matrix[ FRONT_CENTER][SIDE_RIGHT]+= s->slev*sqrt(0.5);
}else
av_assert0(0);
}
if(unaccounted & AV_CH_FRONT_LEFT_OF_CENTER){
if(s->out_ch_layout & AV_CH_FRONT_LEFT){
matrix[ FRONT_LEFT][ FRONT_LEFT_OF_CENTER]+= 1.0;
matrix[FRONT_RIGHT][FRONT_RIGHT_OF_CENTER]+= 1.0;
}else if(s->out_ch_layout & AV_CH_FRONT_CENTER){
matrix[ FRONT_CENTER][ FRONT_LEFT_OF_CENTER]+= sqrt(0.5);
matrix[ FRONT_CENTER][FRONT_RIGHT_OF_CENTER]+= sqrt(0.5);
}else
av_assert0(0);
}
//FIXME quantize for integeres
for(out_i=i=0; i<64; i++){
double sum=0;
int in_i=0;
int ch_in=0;
for(j=0; j<64; j++){
s->matrix[out_i][in_i]= matrix[i][j];
if(matrix[i][j]){
s->matrix_ch[out_i][++ch_in]= in_i;
sum += fabs(matrix[i][j]);
}
if(s->in_ch_layout & (1ULL<<j))
in_i++;
}
s->matrix_ch[out_i][0]= ch_in;
maxcoef= FFMAX(maxcoef, sum);
if(s->out_ch_layout & (1ULL<<i))
out_i++;
}
if(( s->out_sample_fmt < AV_SAMPLE_FMT_FLT
|| s->int_sample_fmt < AV_SAMPLE_FMT_FLT) && maxcoef > 1.0){
for(i=0; i<SWR_CH_MAX; i++)
for(j=0; j<SWR_CH_MAX; j++)
s->matrix[i][j] /= maxcoef;
}
for(i=0; i<av_get_channel_layout_nb_channels(s->out_ch_layout); i++){
for(j=0; j<av_get_channel_layout_nb_channels(s->in_ch_layout); j++){
av_log(NULL, AV_LOG_ERROR, "%f ", s->matrix[i][j]);
}
av_log(NULL, AV_LOG_ERROR, "\n");
}
return 0;
}
int swr_rematrix(SwrContext *s, AudioData *out, AudioData *in, int len, int mustcopy){
int out_i, in_i, i, j;
av_assert0(out->ch_count == av_get_channel_layout_nb_channels(s->out_ch_layout));
av_assert0(in ->ch_count == av_get_channel_layout_nb_channels(s-> in_ch_layout));
for(out_i=0; out_i<out->ch_count; out_i++){
switch(s->matrix_ch[out_i][0]){
case 1:
in_i= s->matrix_ch[out_i][1];
if(mustcopy || s->matrix[out_i][in_i]!=1.0){
if(s->int_sample_fmt == AV_SAMPLE_FMT_FLT){
copy_float(out->ch[out_i], in->ch[in_i], s->matrix[out_i][in_i], len);
}else
copy_s16 (out->ch[out_i], in->ch[in_i], s->matrix[out_i][in_i], len);
}else{
out->ch[out_i]= in->ch[in_i];
}
break;
case 2:
if(s->int_sample_fmt == AV_SAMPLE_FMT_FLT){
sum2_float(out->ch[out_i], in->ch[ s->matrix_ch[out_i][1] ], in->ch[ s->matrix_ch[out_i][2] ],
s->matrix[out_i][ s->matrix_ch[out_i][1] ], s->matrix[out_i][ s->matrix_ch[out_i][2] ],
len);
}else{
sum2_s16 (out->ch[out_i], in->ch[ s->matrix_ch[out_i][1] ], in->ch[ s->matrix_ch[out_i][2] ],
s->matrix[out_i][ s->matrix_ch[out_i][1] ], s->matrix[out_i][ s->matrix_ch[out_i][2] ],
len);
}
break;
default:
if(s->int_sample_fmt == AV_SAMPLE_FMT_FLT){
for(i=0; i<len; i++){
float v=0;
for(j=0; j<s->matrix_ch[out_i][0]; j++){
in_i= s->matrix_ch[out_i][1+j];
v+= ((float*)in->ch[in_i])[i] * s->matrix[out_i][in_i];
}
((float*)out->ch[out_i])[i]= v;
}
}else{
for(i=0; i<len; i++){
int v=0;
for(j=0; j<s->matrix_ch[out_i][0]; j++){
in_i= s->matrix_ch[out_i][1+j];
v+= ((int16_t*)in->ch[in_i])[i] * s->matrix[out_i][in_i]; //FIXME use int16 coeffs
}
((int16_t*)out->ch[out_i])[i]= v;
}
}
}
}
return 0;
}