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https://github.com/mpv-player/mpv
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- Improved runtime control system - 3 New filter panning, compressor/limiter and a noise gate - The compressor/limiter and the noise gate are not yet finished - The panning filter does combined mixing and channel routing and can be used to down-mix from stereo to mono (for example) - Improvements to volume and channel - volume now has a very good soft clipping using sin() - channel can handle generic routing of audio data - Conversion of all filters to handle floating point data - Cleanup of message printing - Fix for the sig 11 bug reported by Denes git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@8608 b3059339-0415-0410-9bf9-f77b7e298cf2
80 lines
1.6 KiB
C
80 lines
1.6 KiB
C
#include <math.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<AF_NCH;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, float* 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<AF_NCH;i++)
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out[i]=clamp(in[i],ma,mi);
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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, float* 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)
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return AF_ERROR;
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for(i=0;i<AF_NCH;i++)
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out[i]=in[i];
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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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