mirror of https://github.com/mpv-player/mpv
88 lines
2.7 KiB
C
88 lines
2.7 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* 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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mp_audio_copy_config(af->data, (struct mp_audio*)arg);
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mp_audio_set_format(af->data, AF_FORMAT_FLOAT);
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return af_test_output(af,(struct mp_audio*)arg);
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}
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return AF_UNKNOWN;
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}
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static int filter_frame(struct af_instance *af, struct mp_audio *c)
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{
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if (!c)
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return 0;
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if (af_make_writeable(af, c) < 0) {
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talloc_free(c);
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return 0;
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}
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float* a = c->planes[0]; // Audio data
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int nch = c->nch; // Number of channels
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int len = c->samples*nch; // Number of samples in current audio block
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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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af_add_output_frame(af, c);
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return 0;
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}
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// Allocate memory and set function pointers
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static int af_open(struct af_instance* af){
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af->control = control;
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af->filter_frame = filter_frame;
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return AF_OK;
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}
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// Description of this filter
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const struct af_info af_info_karaoke = {
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.info = "Simple karaoke/voice-removal audio filter",
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.name = "karaoke",
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.flags = AF_FLAGS_NOT_REENTRANT,
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.open = af_open,
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};
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