mirror of https://github.com/mpv-player/mpv
104 lines
2.4 KiB
C
104 lines
2.4 KiB
C
/*
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* Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
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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 <inttypes.h>
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#include <math.h>
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#include "config.h"
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#include "af.h"
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typedef struct af_sweep_s{
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double x;
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double delta;
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}af_sweept;
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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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af_sweept* s = (af_sweept*)af->setup;
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af_data_t *data= (af_data_t*)arg;
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switch(cmd){
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case AF_CONTROL_REINIT:
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af->data->nch = data->nch;
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af->data->format = AF_FORMAT_S16_NE;
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af->data->bps = 2;
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af->data->rate = data->rate;
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return AF_OK;
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case AF_CONTROL_COMMAND_LINE:
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sscanf((char*)arg,"%lf", &s->delta);
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return AF_OK;
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/* case AF_CONTROL_RESAMPLE_RATE | AF_CONTROL_SET:
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af->data->rate = *(int*)arg;
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return AF_OK;*/
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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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free(af->data);
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free(af->setup);
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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_sweept *s = af->setup;
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int i, j;
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int16_t *in = (int16_t*)data->audio;
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int chans = data->nch;
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int in_len = data->len/(2*chans);
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for(i=0; i<in_len; i++){
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for(j=0; j<chans; j++)
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in[i*chans+j]= 32000*sin(s->x*s->x);
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s->x += s->delta;
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if(2*s->x*s->delta >= 3.141592) s->x=0;
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}
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return data;
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}
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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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af->setup=calloc(1,sizeof(af_sweept));
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return AF_OK;
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}
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af_info_t af_info_sweep = {
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"sine sweep",
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"sweep",
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"Michael Niedermayer",
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"",
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AF_FLAGS_REENTRANT,
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af_open
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};
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