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https://github.com/FFmpeg/FFmpeg.git
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b5875b9111
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>
150 lines
6.9 KiB
C
150 lines
6.9 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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* 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 "libavutil/avassert.h"
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#include "libavutil/common.h"
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#include "libavutil/audioconvert.h"
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#include "swresample.h"
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#undef fprintf
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#define SAMPLES 1000
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#define ASSERT_LEVEL 2
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static double get(const void *p, int index, enum AVSampleFormat f){
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switch(f){
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case AV_SAMPLE_FMT_U8 : return ((const uint8_t*)p)[index]/255.0*2-1.0;
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case AV_SAMPLE_FMT_S16: return ((const int16_t*)p)[index]/32767.0;
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case AV_SAMPLE_FMT_S32: return ((const int32_t*)p)[index]/2147483647.0;
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case AV_SAMPLE_FMT_FLT: return ((const float *)p)[index];
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case AV_SAMPLE_FMT_DBL: return ((const double *)p)[index];
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default: av_assert2(0);
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}
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}
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static void set(void *p, int index, enum AVSampleFormat f, double v){
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switch(f){
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case AV_SAMPLE_FMT_U8 : ((uint8_t*)p)[index]= (v+1.0)*255.0/2; break;
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case AV_SAMPLE_FMT_S16: ((int16_t*)p)[index]= v*32767; break;
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case AV_SAMPLE_FMT_S32: ((int32_t*)p)[index]= v*2147483647; break;
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case AV_SAMPLE_FMT_FLT: ((float *)p)[index]= v; break;
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case AV_SAMPLE_FMT_DBL: ((double *)p)[index]= v; break;
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default: av_assert2(0);
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}
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}
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uint64_t layouts[]={
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AV_CH_LAYOUT_MONO ,
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AV_CH_LAYOUT_STEREO ,
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AV_CH_LAYOUT_2_1 ,
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AV_CH_LAYOUT_SURROUND ,
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AV_CH_LAYOUT_4POINT0 ,
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AV_CH_LAYOUT_2_2 ,
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AV_CH_LAYOUT_QUAD ,
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AV_CH_LAYOUT_5POINT0 ,
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AV_CH_LAYOUT_5POINT1 ,
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AV_CH_LAYOUT_5POINT0_BACK ,
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AV_CH_LAYOUT_5POINT1_BACK ,
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AV_CH_LAYOUT_7POINT0 ,
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AV_CH_LAYOUT_7POINT1 ,
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AV_CH_LAYOUT_7POINT1_WIDE ,
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0
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};
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int main(int argc, char **argv){
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int in_sample_rate, out_sample_rate, ch ,i, in_ch_layout_index, out_ch_layout_index, osr;
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uint64_t in_ch_layout, out_ch_layout;
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enum AVSampleFormat in_sample_fmt, out_sample_fmt;
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int sample_rates[]={8000,11025,16000,22050,32000};
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uint8_t array_in[SAMPLES*8*8];
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uint8_t array_mid[SAMPLES*8*8*3];
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uint8_t array_out[SAMPLES*8*8+100];
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struct SwrContext * forw_ctx= NULL;
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struct SwrContext *backw_ctx= NULL;
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in_sample_rate=16000;
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for(osr=0; osr<5; osr++){
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out_sample_rate= sample_rates[osr];
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for(in_sample_fmt= AV_SAMPLE_FMT_U8; in_sample_fmt<=AV_SAMPLE_FMT_DBL; in_sample_fmt++){
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for(out_sample_fmt= AV_SAMPLE_FMT_U8; out_sample_fmt<=AV_SAMPLE_FMT_DBL; out_sample_fmt++){
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for(in_ch_layout_index=0; layouts[in_ch_layout_index]; in_ch_layout_index++){
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in_ch_layout= layouts[in_ch_layout_index];
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int in_ch_count= av_get_channel_layout_nb_channels(in_ch_layout);
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for(out_ch_layout_index=0; layouts[out_ch_layout_index]; out_ch_layout_index++){
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int out_count, mid_count;
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out_ch_layout= layouts[out_ch_layout_index];
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int out_ch_count= av_get_channel_layout_nb_channels(out_ch_layout);
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fprintf(stderr, "ch %d->%d, rate:%5d->%5d, fmt:%s->%s",
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in_ch_count, out_ch_count,
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in_sample_rate, out_sample_rate,
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av_get_sample_fmt_name(in_sample_fmt), av_get_sample_fmt_name(out_sample_fmt));
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forw_ctx = swr_alloc2(forw_ctx, out_ch_layout, out_sample_fmt, out_sample_rate,
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in_ch_layout, in_sample_fmt, in_sample_rate, 0, 0);
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backw_ctx = swr_alloc2(backw_ctx,in_ch_layout, in_sample_fmt, in_sample_rate,
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out_ch_layout, out_sample_fmt, out_sample_rate, 0, 0);
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if(swr_init( forw_ctx) < 0)
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fprintf(stderr, "swr_init(->) failed\n");
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if(swr_init(backw_ctx) < 0)
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fprintf(stderr, "swr_init(<-) failed\n");
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if(!forw_ctx)
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fprintf(stderr, "Failed to init forw_cts\n");
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if(!backw_ctx)
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fprintf(stderr, "Failed to init backw_ctx\n");
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//FIXME test planar
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for(ch=0; ch<in_ch_count; ch++){
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for(i=0; i<SAMPLES; i++)
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set(array_in, ch + i*in_ch_count, in_sample_fmt, sin(i*i*3/SAMPLES));
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}
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mid_count= swr_convert(forw_ctx, ( uint8_t*[]){array_mid}, 3*SAMPLES,
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(const uint8_t*[]){array_in }, SAMPLES);
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out_count= swr_convert(backw_ctx,( uint8_t*[]){array_out}, 3*SAMPLES,
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(const uint8_t*[]){array_mid}, mid_count);
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for(ch=0; ch<in_ch_count; ch++){
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double sse, x, maxdiff=0;
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double sum_a= 0;
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double sum_b= 0;
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double sum_aa= 0;
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double sum_bb= 0;
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double sum_ab= 0;
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for(i=0; i<SAMPLES; i++){
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double a= get(array_in , ch + i*in_ch_count, in_sample_fmt);
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double b= get(array_out, ch + i*in_ch_count, in_sample_fmt);
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sum_a += a;
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sum_b += b;
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sum_aa+= a*a;
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sum_bb+= b*b;
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sum_ab+= a*b;
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maxdiff= FFMAX(maxdiff, FFABS(a-b));
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}
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x = sum_ab/sum_bb;
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sse= sum_aa + sum_bb*x*x - 2*x*sum_ab;
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fprintf(stderr, "[%f %f %f] len:%5d\n", sqrt(sse/SAMPLES), x, maxdiff, out_count);
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}
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fprintf(stderr, "\n");
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}
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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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