mirror of https://github.com/mpv-player/mpv
96 lines
1.9 KiB
C
96 lines
1.9 KiB
C
// Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
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// #inlcude <GPL_v2.h>
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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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if(data->format != (AF_FORMAT_SI | AF_FORMAT_NE))
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return AF_ERROR;
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af->data->nch = data->nch;
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af->data->format = AF_FORMAT_SI | AF_FORMAT_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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if(af->data)
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free(af->data);
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if(af->setup){
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af_sweept *s = af->setup;
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free(s);
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}
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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 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.n=1;
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af->mul.d=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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open
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};
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