mirror of https://github.com/mpv-player/mpv
93 lines
1.9 KiB
C
93 lines
1.9 KiB
C
#include <math.h>
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#include <string.h>
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#include <af.h>
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/* Convert to gain value from dB. Returns AF_OK if of and AF_ERROR if
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fail */
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inline int af_from_dB(int n, float* in, float* out, float k, float mi, float ma)
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{
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int i = 0;
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// Sanity check
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if(!in || !out)
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return AF_ERROR;
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for(i=0;i<n;i++){
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if(in[i]<=-200)
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out[i]=0.0;
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else
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out[i]=pow(10.0,clamp(in[i],mi,ma)/k);
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}
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return AF_OK;
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}
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/* Convert from gain value to dB. Returns AF_OK if of and AF_ERROR if
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fail */
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inline int af_to_dB(int n, float* in, float* out, float k)
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{
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int i = 0;
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// Sanity check
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if(!in || !out)
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return AF_ERROR;
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for(i=0;i<n;i++){
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if(in[i] == 0.0)
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out[i]=-200.0;
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else
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out[i]=k*log10(in[i]);
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}
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return AF_OK;
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}
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/* Convert from ms to sample time */
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inline int af_from_ms(int n, float* in, int* out, int rate, float mi, float ma)
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{
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int i = 0;
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// Sanity check
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if(!in || !out)
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return AF_ERROR;
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for(i=0;i<n;i++)
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out[i]=(int)((float)rate * clamp(in[i],mi,ma)/1000.0);
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return AF_OK;
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}
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/* Convert from sample time to ms */
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inline int af_to_ms(int n, int* in, float* out, int rate)
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{
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int i = 0;
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// Sanity check
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if(!in || !out || !rate)
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return AF_ERROR;
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for(i=0;i<n;i++)
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out[i]=1000.0 * (float)in[i]/((float)rate);
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return AF_OK;
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}
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/* Helper function for testing the output format */
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inline int af_test_output(struct af_instance_s* af, af_data_t* out)
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{
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if((af->data->format != out->format) ||
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(af->data->bps != out->bps) ||
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(af->data->rate != out->rate) ||
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(af->data->nch != out->nch)){
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memcpy(out,af->data,sizeof(af_data_t));
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return AF_FALSE;
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}
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return AF_OK;
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}
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/* Soft clipping, the sound of a dream, thanks to Jon Wattes
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post to Musicdsp.org */
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inline float af_softclip(float a)
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{
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if (a >= M_PI/2)
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return 1.0;
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else if (a <= -M_PI/2)
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return -1.0;
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else
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return sin(a);
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}
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