1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
#include "mmband/api/adsr.h"
#include <stdio.h>
#include <stdlib.h>
#include <portaudio.h>
#include <mmband/api/instrument.h>
#define SAMPLE_RATE 44100
#define FRAMES_PER_BUFFER 512
// TODO: make adsr depend on sample rate
int main (void) {
PaStream *stream;
PaError err = Pa_Initialize();
if (err != paNoError) {
printf("PortAudio error: %s\n", Pa_GetErrorText(err));
return 1;
}
PaStreamParameters output_params;
output_params.device = Pa_GetDefaultOutputDevice();
output_params.channelCount = 2;
output_params.sampleFormat = paFloat32;
output_params.suggestedLatency = Pa_GetDeviceInfo(output_params.device)->defaultHighInputLatency;
output_params.hostApiSpecificStreamInfo = NULL;
printf("Opening stream.\n");
err = Pa_OpenStream(
&stream,
NULL,
&output_params,
SAMPLE_RATE,
FRAMES_PER_BUFFER,
paClipOff,
NULL,
NULL
);
if (err != paNoError) {
printf("PortAudio error: %s\n", Pa_GetErrorText(err));
return 1;
}
instrument_ref instrument = ins_new();
ins_set_carrier(instrument, OSC_SINE);
ins_set_modulator(instrument, OSC_SINE);
ins_set_carrier_amplitude(instrument, 0.25);
ins_set_modulator_amplitude(instrument, 0.25);
ins_set_frequency_mult(instrument, 3.0);
adsr_ref adsr = adsr_new();
adsr_set_attack(adsr, 0.2);
adsr_set_decay(adsr, 0.2);
adsr_set_sustain(adsr, 0.85);
adsr_set_release(adsr, 0.5);
int switch_frames = (60.0 / 120.0) * SAMPLE_RATE;
int iteration = 0;
int state = 0;
printf("Starting stream.\n");
err = Pa_StartStream(stream);
if (err != paNoError) {
printf("PortAudio error: %s\n", Pa_GetErrorText(err));
return 1;
}
ins_set_frequency(instrument, 246.9);
for (int i = 0; i < (60 * SAMPLE_RATE) / FRAMES_PER_BUFFER; ++i) {
float buffer[FRAMES_PER_BUFFER][2];
for (int j = 0; j < FRAMES_PER_BUFFER; j++) {
iteration++;
if (iteration >= switch_frames) {
switch (state) {
case 0:
ins_set_frequency(instrument, 329.6);
//adsr_reset(adsr);
state++;
break;
case 1:
ins_set_frequency(instrument, 370.0);
//adsr_reset(adsr);
state++;
break;
case 2:
ins_set_frequency(instrument, 440.0);
//adsr_reset(adsr);
state++;
break;
case 3:
ins_set_frequency(instrument, 370.0);
//adsr_reset(adsr);
state++;
break;
case 4:
ins_set_frequency(instrument, 329.6);
//adsr_reset(adsr);
state++;
break;
default:
ins_set_frequency(instrument, 246.9);
//adsr_reset(adsr);
state = 0;
break;
}
iteration = 0;
}
//float env = adsr_tick(adsr, SAMPLE_RATE);
float ins = ins_tick(instrument, SAMPLE_RATE);
buffer[j][0] = ins;// * env;
buffer[j][1] = ins;// * env;
}
err = Pa_WriteStream(stream, buffer, FRAMES_PER_BUFFER);
if (err != paNoError) {
printf("PortAudio error: %s\n", Pa_GetErrorText(err));
return 1;
}
}
Pa_StopStream(stream);
Pa_CloseStream(stream);
adsr_free(adsr);
ins_free(instrument);
Pa_Terminate();
return 0;
}
|
