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annotate example/synthesizer/ppe/OSC.cc @ 2048:6796d85f3d6b draft

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remove error
author Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
date Thu, 28 Jan 2016 00:05:49 +0900
parents 652dd569acc1
children
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1 #include <stdio.h>
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2 #include <string.h>
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3 #include "AudioData.h"
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4 #include "Func.h"
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5 #include "OSC.h"
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6
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7 #include <sdl.h>
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8 #include <SDL_audio.h>
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9 #include <math.h>
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10 /* これは必須 */
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11 SchedDefineTask1(Audioosc,osc);
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12
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13 SDL_AudioSpec Desired;
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14 SDL_AudioSpec Obtained;
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15
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16 double
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17 square(double t)
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18 {
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19 double decimal_part = t - abs(t);
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20 return decimal_part < 0.5 ? 1 : -1;
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21 }
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22
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23 double
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24 tri(double t)
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25 {
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26 double decimal_part = t - abs(t);
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27 if(abs(t) % 2 != 0){
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28 return decimal_part < 0.5 ? decimal_part : 1 - decimal_part;
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29 }else{
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30 return decimal_part < 0.5 ? -decimal_part : 1 - decimal_part;
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31 }
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32 }
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33
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34 double
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35 saw(double t)
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36 {
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37 double decimal_part = t - abs(t);
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38 return decimal_part;
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39 }
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40
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41
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42 void callback(void *userdata,Uint8 *stream,int len){
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44 AudioDataPtr au = (AudioData*)userdata;
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46 char *waveform_name = au->waveform_name;
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47 double frequency = au->frequency;
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48 int volume = au->volume;
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49 static unsigned int step = 0;
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50 Uint16 *frames = (Uint16 *) stream;
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51 int framesize = len / 2;
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52
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53 if(strcmp(waveform_name, "tri") == 0){
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54 for (int i = 0; i < framesize ; i++, step++){
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55 frames[i] = tri(step * frequency / Obtained.freq) * volume ;
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56 }
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57
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58 }else if(strcmp(waveform_name, "sqr") == 0){
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59 for (int i = 0; i < framesize ; i++, step++){
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60 frames[i] = square(step * frequency / Obtained.freq) * volume ;
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61 }
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62
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63 }else if(strcmp(waveform_name, "saw") == 0){
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64 for (int i = 0; i < framesize ; i++, step++){
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65 frames[i] = saw(step * frequency / Obtained.freq) * volume ;
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66 }
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67 }
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68 }
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69
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70 static int
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71 osc(SchedTask *s, void *rbuf, void *wbuf)
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72 {
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73 AudioData *i_data = (AudioDataPtr)s->get_input(0);
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74
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75 Desired.freq = i_data->sampling_rate; /* Sampling rate: 44100Hz */
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76 Desired.format = i_data->format; /* 16-bit signed audio */
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77 Desired.channels = i_data->channels; /* Mono */
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78 Desired.samples = i_data->samples; /* Buffer size: 8K = 0.37 sec. */
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79 Desired.callback = callback;
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80 Desired.userdata = (void*)i_data;
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81
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82 SDL_OpenAudio(&Desired, &Obtained);
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83 SDL_PauseAudio(0);
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84 SDL_Delay(1000);
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85 SDL_Quit();
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86
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87 return 0;
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88 }