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added dinamically calculated gain factor at output stage to avoid clipping on sane ranges

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@17813 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
reynaldo 2006-03-11 21:16:59 +00:00
parent 05b2368382
commit 4e880d8076
1 changed files with 23 additions and 2 deletions
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25
libaf/af_equalizer.c
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@ -58,6 +58,7 @@ typedef struct af_equalizer_s
float g[AF_NCH][KM]; // Gain factor for each channel and band
int K; // Number of used eq bands
int channels; // Number of channels
float gain_factor; // applied at output to avoid clipping
} af_equalizer_t;
// 2nd order Band-pass Filter design
@ -79,9 +80,11 @@ static int control(struct af_instance_s* af, int cmd, void* arg)
switch(cmd){
case AF_CONTROL_REINIT:{
int k =0;
int k =0, i =0;
float F[KM] = CF;
s->gain_factor=0.0;
// Sanity check
if(!arg) return AF_ERROR;
@ -105,7 +108,25 @@ static int control(struct af_instance_s* af, int cmd, void* arg)
// Calculate how much this plugin adds to the overall time delay
af->delay += 2000.0/((float)af->data->rate);
// Calculate gain factor to prevent clipping at output
for(k=0;k<AF_NCH;k++)
{
for(i=0;i<KM;i++)
{
if(s->gain_factor < s->g[k][i]) s->gain_factor=s->g[k][i];
}
}
s->gain_factor=log10(s->gain_factor + 1.0) * 20.0;
if(s->gain_factor > 0.0)
{
s->gain_factor=0.1+(s->gain_factor/12.0);
}else{
s->gain_factor=1;
}
return af_test_output(af,arg);
}
case AF_CONTROL_COMMAND_LINE:{
@ -190,7 +211,7 @@ static af_data_t* play(struct af_instance_s* af, af_data_t* data)
wq[0] = w;
}
// Calculate output
*out=yt;
*out=yt*s->gain_factor;
out+=nch;
}
}