mirror of https://github.com/mpv-player/mpv
150 lines
3.8 KiB
C
150 lines
3.8 KiB
C
/*
|
|
* Copyright (C) 2006 Michael Niedermayer
|
|
* Copyright (C) 2004 Alex Beregszaszi
|
|
* based upon af_extrastereo.c by Pierre Lombard
|
|
*
|
|
* This file is part of MPlayer.
|
|
*
|
|
* MPlayer is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* MPlayer is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include <inttypes.h>
|
|
#include <math.h>
|
|
#include <limits.h>
|
|
|
|
#include "af.h"
|
|
|
|
// Data for specific instances of this filter
|
|
typedef struct af_sinesuppress_s
|
|
{
|
|
double freq;
|
|
double decay;
|
|
double real;
|
|
double imag;
|
|
double ref;
|
|
double pos;
|
|
}af_sinesuppress_t;
|
|
|
|
static int play_s16(struct af_instance* af, struct mp_audio* data, int f);
|
|
//static struct mp_audio* play_float(struct af_instance* af, struct mp_audio* data);
|
|
|
|
// Initialization and runtime control
|
|
static int control(struct af_instance* af, int cmd, void* arg)
|
|
{
|
|
switch(cmd){
|
|
case AF_CONTROL_REINIT:{
|
|
// Sanity check
|
|
if(!arg) return AF_ERROR;
|
|
|
|
mp_audio_copy_config(af->data, (struct mp_audio*)arg);
|
|
mp_audio_set_num_channels(af->data, 1);
|
|
#if 0
|
|
if (((struct mp_audio*)arg)->format == AF_FORMAT_FLOAT)
|
|
{
|
|
af->data->format = AF_FORMAT_FLOAT;
|
|
af->data->bps = 4;
|
|
af->play = play_float;
|
|
}// else
|
|
#endif
|
|
{
|
|
mp_audio_set_format(af->data, AF_FORMAT_S16);
|
|
af->filter = play_s16;
|
|
}
|
|
|
|
return af_test_output(af,(struct mp_audio*)arg);
|
|
}
|
|
}
|
|
return AF_UNKNOWN;
|
|
}
|
|
|
|
// Filter data through filter
|
|
static int play_s16(struct af_instance* af, struct mp_audio* data, int f)
|
|
{
|
|
af_sinesuppress_t *s = af->priv;
|
|
register int i = 0;
|
|
int16_t *a = (int16_t*)data->planes[0]; // Audio data
|
|
int len = data->samples*data->nch; // Number of samples
|
|
|
|
for (i = 0; i < len; i++)
|
|
{
|
|
double co= cos(s->pos);
|
|
double si= sin(s->pos);
|
|
|
|
s->real += co * a[i];
|
|
s->imag += si * a[i];
|
|
s->ref += co * co;
|
|
|
|
a[i] -= (s->real * co + s->imag * si) / s->ref;
|
|
|
|
s->real -= s->real * s->decay;
|
|
s->imag -= s->imag * s->decay;
|
|
s->ref -= s->ref * s->decay;
|
|
|
|
s->pos += 2 * M_PI * s->freq / data->rate;
|
|
}
|
|
|
|
MP_VERBOSE(af, "f:%8.2f: amp:%8.2f\n", s->freq, sqrt(s->real*s->real + s->imag*s->imag) / s->ref);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if 0
|
|
static struct mp_audio* play_float(struct af_instance* af, struct mp_audio* data)
|
|
{
|
|
af_sinesuppress_t *s = af->setup;
|
|
register int i = 0;
|
|
float *a = (float*)data->audio; // Audio data
|
|
int len = data->len/4; // Number of samples
|
|
float avg, l, r;
|
|
|
|
for (i = 0; i < len; i+=2)
|
|
{
|
|
avg = (a[i] + a[i + 1]) / 2;
|
|
|
|
/* l = avg + (s->mul * (a[i] - avg));
|
|
r = avg + (s->mul * (a[i + 1] - avg));*/
|
|
|
|
a[i] = af_softclip(l);
|
|
a[i + 1] = af_softclip(r);
|
|
}
|
|
|
|
return data;
|
|
}
|
|
#endif
|
|
|
|
// Allocate memory and set function pointers
|
|
static int af_open(struct af_instance* af){
|
|
af->control=control;
|
|
af->filter=play_s16;
|
|
return AF_OK;
|
|
}
|
|
|
|
#define OPT_BASE_STRUCT af_sinesuppress_t
|
|
const struct af_info af_info_sinesuppress = {
|
|
.info = "Sine Suppress",
|
|
.name = "sinesuppress",
|
|
.open = af_open,
|
|
.priv_size = sizeof(af_sinesuppress_t),
|
|
.options = (const struct m_option[]) {
|
|
OPT_DOUBLE("freq", freq, 0, OPTDEF_DOUBLE(50.0)),
|
|
OPT_DOUBLE("decay", decay, 0, OPTDEF_DOUBLE(0.0001)),
|
|
{0}
|
|
},
|
|
};
|