mirror of https://github.com/mpv-player/mpv
118 lines
3.0 KiB
C
118 lines
3.0 KiB
C
/*
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* Copyright (C) 2006 Michael Niedermayer
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* Copyright (C) 2004 Alex Beregszaszi
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* based upon af_extrastereo.c by Pierre Lombard
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*
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* This file is part of mpv.
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*
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* mpv 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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* mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>.
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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 <inttypes.h>
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#include <math.h>
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#include <limits.h>
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#include "af.h"
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// Data for specific instances of this filter
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typedef struct af_sinesuppress_s
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{
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double freq;
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double decay;
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double real;
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double imag;
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double ref;
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double pos;
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}af_sinesuppress_t;
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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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// Sanity check
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if(!arg) return AF_ERROR;
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mp_audio_copy_config(af->data, (struct mp_audio*)arg);
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mp_audio_set_num_channels(af->data, 1);
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mp_audio_set_format(af->data, AF_FORMAT_S16);
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return af_test_output(af,(struct mp_audio*)arg);
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}
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}
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return AF_UNKNOWN;
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}
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static int play_s16(struct af_instance *af, struct mp_audio *data)
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{
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if (!data)
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return 0;
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if (af_make_writeable(af, data) < 0) {
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talloc_free(data);
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return -1;
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}
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af_sinesuppress_t *s = af->priv;
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register int i = 0;
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int16_t *a = (int16_t*)data->planes[0]; // Audio data
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int len = data->samples*data->nch; // Number of samples
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for (i = 0; i < len; i++)
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{
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double co= cos(s->pos);
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double si= sin(s->pos);
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s->real += co * a[i];
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s->imag += si * a[i];
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s->ref += co * co;
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a[i] -= (s->real * co + s->imag * si) / s->ref;
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s->real -= s->real * s->decay;
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s->imag -= s->imag * s->decay;
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s->ref -= s->ref * s->decay;
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s->pos += 2 * M_PI * s->freq / data->rate;
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}
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MP_VERBOSE(af, "f:%8.2f: amp:%8.2f\n", s->freq, sqrt(s->real*s->real + s->imag*s->imag) / s->ref);
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af_add_output_frame(af, data);
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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 = play_s16;
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return AF_OK;
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}
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#define OPT_BASE_STRUCT af_sinesuppress_t
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const struct af_info af_info_sinesuppress = {
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.info = "Sine Suppress",
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.name = "sinesuppress",
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.open = af_open,
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.priv_size = sizeof(af_sinesuppress_t),
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.options = (const struct m_option[]) {
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OPT_DOUBLE("freq", freq, 0, OPTDEF_DOUBLE(50.0)),
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OPT_DOUBLE("decay", decay, 0, OPTDEF_DOUBLE(0.0001)),
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{0}
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},
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};
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