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https://github.com/mpv-player/mpv
synced 2024-12-24 07:33:46 +01:00
Added soft clipping for software volume control
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@5064 b3059339-0415-0410-9bf9-f77b7e298cf2
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@ -112,6 +112,7 @@ struct config ao_plugin_conf[]={
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{"fout", &ao_plugin_cfg.pl_resample_fout, CONF_TYPE_INT, CONF_MIN, 0, 0, NULL},
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{"volume", &ao_plugin_cfg.pl_volume_volume, CONF_TYPE_INT, CONF_RANGE, 0, 255, NULL},
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{"mul", &ao_plugin_cfg.pl_extrastereo_mul, CONF_TYPE_FLOAT, CONF_MIN, 0, 0, NULL},
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{"softclip", &ao_plugin_cfg.pl_volume_softclip, CONF_TYPE_FLAG, 0, 0, 1, NULL},
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{NULL, NULL, 0, 0, 0, 0, NULL}
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};
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@ -37,6 +37,7 @@ typedef struct ao_plugin_cfg_s
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int pl_resample_fout; // Output frequency from resampling
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int pl_volume_volume; // Initial volume setting
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float pl_extrastereo_mul; // Stereo enhancer multiplier
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int pl_volume_softclip; // Enable soft clipping
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} ao_plugin_cfg_t;
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extern ao_plugin_cfg_t ao_plugin_cfg;
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@ -47,8 +48,9 @@ extern ao_plugin_cfg_t ao_plugin_cfg;
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AFMT_S16_LE, \
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0, \
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48000, \
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255, \
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2.5 \
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101, \
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2.5, \
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0 \
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};
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// This block should not be available in the pl_xxxx files
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@ -4,6 +4,14 @@
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#define PLUGIN
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// Some limits
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#define MIN_S16 -32650
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#define MAX_S16 32650
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#define MIN_U8 0
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#define MAX_U8 255
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#define MIN_S8 -128
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#define MAX_S8 127
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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@ -87,7 +95,7 @@ static int init(){
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of wether this plugin is in use or not. */
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pl_volume.inuse=1;
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// Tell the world what we are up to
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printf("[pl_volume] Software volume control in use.\n");
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printf("[pl_volume] Software volume control in use%s.\n",ao_plugin_cfg.pl_volume_softclip?", soft clipping enabled":"");
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return 1;
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}
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@ -100,24 +108,54 @@ static void uninit(){
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static void reset(){
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}
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#define SIGN(x) (x>0?1:-1)
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// processes 'ao_plugin_data.len' bytes of 'data'
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// called for every block of data
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static int play(){
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register int i=0;
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register int vol=pl_volume.volume; // Logarithmic control sounds more natural
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vol=(vol*vol*vol)>>12;
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// Change the volume.
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switch(pl_volume.format){
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case(AFMT_U8):{
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register uint8_t* data=(uint8_t*)ao_plugin_data.data;
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for(i=0;i<ao_plugin_data.len;i++){
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data[i]=(((data[i]-128) * pl_volume.volume) >> 8) + 128;
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}
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break;
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register int x;
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for(i=0;i<ao_plugin_data.len;i++){
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x=((data[i]-128) * vol) >> 8;
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if(x>MAX_S8)
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data[i]=MAX_U8;
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else if(x<MIN_S8)
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data[i]=MIN_U8;
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else{
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if(ao_plugin_cfg.pl_volume_softclip)
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data[i] = ((3*x - ((x*x*x) >> 14)) >> 1) + 128;
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else
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data[i] = x + 128;
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}
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}
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break;
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}
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case(AFMT_S16_LE):{
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register int len=ao_plugin_data.len>>1;
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register int16_t* data=(int16_t*)ao_plugin_data.data;
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for(i=0;i<len;i++)
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data[i]=(data[i]* pl_volume.volume)>>8;
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register int x;
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for(i=0;i<len;i++){
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x=(data[i] * vol) >> 8;
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if(x>MAX_S16)
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data[i]=MAX_S16;
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else if(x<MIN_S16)
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data[i]=MIN_S16;
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else{
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if(ao_plugin_cfg.pl_volume_softclip){
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int64_t t=x*x;
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t=(t*x) >> 30;
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data[i] = (3*x - (int)t) >> 1;
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//data[i] = 2*x - SIGN(x)*((x*x)>>15);
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}
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else
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data[i] = x;
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}
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}
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break;
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}
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default:
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@ -126,8 +164,3 @@ static int play(){
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return 1;
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}
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