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mirror of https://github.com/mpv-player/mpv synced 2025-02-23 10:55:27 +01:00
mpv/libaf/af_tools.c
anders 6adaa78ee9 Changes includes:
- 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
2002-12-28 13:59:53 +00:00

80 lines
1.6 KiB
C

#include <math.h>
#include <af.h>
/* Convert to gain value from dB. Returns AF_OK if of and AF_ERROR if
fail */
inline int af_from_dB(int n, float* in, float* out, float k, float mi, float ma)
{
int i = 0;
// Sanity check
if(!in || !out)
return AF_ERROR;
for(i=0;i<n;i++){
if(in[i]<=-200)
out[i]=0.0;
else
out[i]=pow(10.0,clamp(in[i],mi,ma)/k);
}
return AF_OK;
}
/* Convert from gain value to dB. Returns AF_OK if of and AF_ERROR if
fail */
inline int af_to_dB(int n, float* in, float* out, float k)
{
int i = 0;
// Sanity check
if(!in || !out)
return AF_ERROR;
for(i=0;i<AF_NCH;i++){
if(in[i] == 0.0)
out[i]=-200.0;
else
out[i]=k*log10(in[i]);
}
return AF_OK;
}
/* Convert from ms to sample time*/
inline int af_from_ms(int n, float* in, float* out, int rate, float mi, float ma)
{
int i = 0;
// Sanity check
if(!in || !out)
return AF_ERROR;
for(i=0;i<AF_NCH;i++)
out[i]=clamp(in[i],ma,mi);
return AF_OK;
}
/* Convert from sample time to ms */
inline int af_to_ms(int n, float* in, float* out, int rate)
{
int i = 0;
// Sanity check
if(!in || !out)
return AF_ERROR;
for(i=0;i<AF_NCH;i++)
out[i]=in[i];
return AF_OK;
}
/* Helper function for testing the output format */
inline int af_test_output(struct af_instance_s* af, af_data_t* out)
{
if((af->data->format != out->format) ||
(af->data->bps != out->bps) ||
(af->data->rate != out->rate) ||
(af->data->nch != out->nch)){
memcpy(out,af->data,sizeof(af_data_t));
return AF_FALSE;
}
return AF_OK;
}