mirror of https://github.com/mpv-player/mpv
87 lines
1.7 KiB
C
87 lines
1.7 KiB
C
/*
|
|
(c)2006 MPlayer / Reynaldo H. Verdejo Pinochet
|
|
Based on code by Alex Beregszaszi for his 'center' filter
|
|
|
|
License: GPL
|
|
|
|
Simple voice removal filter
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "af.h"
|
|
|
|
// Data for specific instances of this filter
|
|
|
|
// Initialization and runtime control
|
|
static int control(struct af_instance_s* af, int cmd, void* arg)
|
|
{
|
|
switch(cmd){
|
|
case AF_CONTROL_REINIT:
|
|
af->data->rate = ((af_data_t*)arg)->rate;
|
|
af->data->nch = ((af_data_t*)arg)->nch;
|
|
af->data->format= AF_FORMAT_FLOAT_NE;
|
|
af->data->bps = 4;
|
|
return af_test_output(af,(af_data_t*)arg);
|
|
}
|
|
return AF_UNKNOWN;
|
|
}
|
|
|
|
// Deallocate memory
|
|
static void uninit(struct af_instance_s* af)
|
|
{
|
|
if(af->data)
|
|
free(af->data);
|
|
}
|
|
|
|
// Filter data through filter
|
|
static af_data_t* play(struct af_instance_s* af, af_data_t* data)
|
|
{
|
|
af_data_t* c = data; // Current working data
|
|
float* a = c->audio; // Audio data
|
|
int len = c->len/4; // Number of samples in current audio block
|
|
int nch = c->nch; // Number of channels
|
|
register int i;
|
|
|
|
/*
|
|
FIXME1 add a low band pass filter to avoid suppressing
|
|
centered bass/drums
|
|
FIXME2 better calculated* attenuation factor
|
|
*/
|
|
|
|
for(i=0;i<len;i+=nch)
|
|
{
|
|
a[i] = (a[i] - a[i+1]) * 0.7;
|
|
a[i+1]=a[i];
|
|
}
|
|
|
|
return c;
|
|
}
|
|
|
|
// Allocate memory and set function pointers
|
|
static int open(af_instance_t* af){
|
|
af->control = control;
|
|
af->uninit = uninit;
|
|
af->play = play;
|
|
af->mul.n = 1;
|
|
af->mul.d = 1;
|
|
af->data = calloc(1,sizeof(af_data_t));
|
|
|
|
if(af->data == NULL)
|
|
return AF_ERROR;
|
|
|
|
return AF_OK;
|
|
}
|
|
|
|
// Description of this filter
|
|
af_info_t af_info_karaoke = {
|
|
"Simple karaoke/voice-removal audio filter",
|
|
"karaoke",
|
|
"Reynaldo H. Verdejo Pinochet",
|
|
"",
|
|
AF_FLAGS_NOT_REENTRANT,
|
|
open
|
|
};
|