vo_gl: make shader code generation easier to deal with
[mplayer.git] / libaf / af_karaoke.c
blob780349dfeed22c31a1ad58d10da7944bfc3585e5
1 /*
2 * simple voice removal filter
4 * copyright (c) 2006 Reynaldo H. Verdejo Pinochet
5 * Based on code by Alex Beregszaszi for his 'center' filter.
7 * This file is part of MPlayer.
9 * MPlayer is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * MPlayer is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with MPlayer; if not, write to the Free Software Foundation, Inc.,
21 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <string.h>
28 #include "af.h"
30 // Data for specific instances of this filter
32 // Initialization and runtime control
33 static int control(struct af_instance_s* af, int cmd, void* arg)
35 switch(cmd){
36 case AF_CONTROL_REINIT:
37 af->data->rate = ((af_data_t*)arg)->rate;
38 af->data->nch = ((af_data_t*)arg)->nch;
39 af->data->format= AF_FORMAT_FLOAT_NE;
40 af->data->bps = 4;
41 return af_test_output(af,(af_data_t*)arg);
43 return AF_UNKNOWN;
46 // Deallocate memory
47 static void uninit(struct af_instance_s* af)
49 free(af->data);
52 // Filter data through filter
53 static af_data_t* play(struct af_instance_s* af, af_data_t* data)
55 af_data_t* c = data; // Current working data
56 float* a = c->audio; // Audio data
57 int len = c->len/4; // Number of samples in current audio block
58 int nch = c->nch; // Number of channels
59 register int i;
62 FIXME1 add a low band pass filter to avoid suppressing
63 centered bass/drums
64 FIXME2 better calculated* attenuation factor
67 for(i=0;i<len;i+=nch)
69 a[i] = (a[i] - a[i+1]) * 0.7;
70 a[i+1]=a[i];
73 return c;
76 // Allocate memory and set function pointers
77 static int af_open(af_instance_t* af){
78 af->control = control;
79 af->uninit = uninit;
80 af->play = play;
81 af->mul = 1;
82 af->data = calloc(1,sizeof(af_data_t));
84 if(af->data == NULL)
85 return AF_ERROR;
87 return AF_OK;
90 // Description of this filter
91 af_info_t af_info_karaoke = {
92 "Simple karaoke/voice-removal audio filter",
93 "karaoke",
94 "Reynaldo H. Verdejo Pinochet",
95 "",
96 AF_FLAGS_NOT_REENTRANT,
97 af_open