mirror of
https://github.com/mpv-player/mpv
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100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
/*
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* simple voice removal filter
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*
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* copyright (c) 2006 Reynaldo H. Verdejo Pinochet
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* Based on code by Alex Beregszaszi for his 'center' filter.
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*
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* This file is part of MPlayer.
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*
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* MPlayer is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* MPlayer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "af.h"
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// Data for specific instances of this filter
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// Initialization and runtime control
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static int control(struct af_instance_s* af, int cmd, void* arg)
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{
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switch(cmd){
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case AF_CONTROL_REINIT:
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af->data->rate = ((af_data_t*)arg)->rate;
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af->data->nch = ((af_data_t*)arg)->nch;
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af->data->format= AF_FORMAT_FLOAT_NE;
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af->data->bps = 4;
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return af_test_output(af,(af_data_t*)arg);
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}
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return AF_UNKNOWN;
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}
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// Deallocate memory
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static void uninit(struct af_instance_s* af)
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{
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if(af->data)
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free(af->data);
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}
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// Filter data through filter
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static af_data_t* play(struct af_instance_s* af, af_data_t* data)
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{
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af_data_t* c = data; // Current working data
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float* a = c->audio; // Audio data
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int len = c->len/4; // Number of samples in current audio block
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int nch = c->nch; // Number of channels
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register int i;
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/*
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FIXME1 add a low band pass filter to avoid suppressing
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centered bass/drums
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FIXME2 better calculated* attenuation factor
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*/
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for(i=0;i<len;i+=nch)
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{
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a[i] = (a[i] - a[i+1]) * 0.7;
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a[i+1]=a[i];
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}
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return c;
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}
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// Allocate memory and set function pointers
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static int af_open(af_instance_t* af){
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af->control = control;
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af->uninit = uninit;
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af->play = play;
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af->mul = 1;
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af->data = calloc(1,sizeof(af_data_t));
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if(af->data == NULL)
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return AF_ERROR;
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return AF_OK;
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}
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// Description of this filter
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af_info_t af_info_karaoke = {
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"Simple karaoke/voice-removal audio filter",
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"karaoke",
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"Reynaldo H. Verdejo Pinochet",
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"",
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AF_FLAGS_NOT_REENTRANT,
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af_open
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};
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