-
Notifications
You must be signed in to change notification settings - Fork 0
/
example.c
296 lines (273 loc) · 7.02 KB
/
example.c
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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
/*
This example program makes use of the simple
sound library to generate a sine wave and write the
output to sound.wav.
For complete documentation on the library, see:
http://www.nd.edu/~dthain/courses/cse20211/fall2013/wavfile
Go ahead and modify this program for your own purposes.
*/
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <errno.h>
#include "wavfile.h"
const int MAX_NOTES=7000;
short waveform[10000000];
short waveform2[10000000];
const int NUM_SAMPLES = (WAVFILE_SAMPLES_PER_SECOND*2);
const int NOTE_SAMPLES =(int) (((double)WAVFILE_SAMPLES_PER_SECOND)/4.0);// samples in quater note
double freqs[MAX_NOTES];
double freqs2[MAX_NOTES];
int duration2[MAX_NOTES];
int duration[MAX_NOTES];// in multiples of 1/16th note, a quater note is 4, full note is 16
int getOctave(char* line){
if (line[1]=='#' || line[1]=='b'){
return line[2]-'0';
} else {
return line[1]-'0';
}
}
int getNoteOrder(char *line){
int order=0;
switch(line[0]){
case 'C':
order = 0;
break;
case 'D':
order = 2;
break;
case 'E':
order = 4;
break;
case 'F':
order = 5;
break;
case 'G':
order = 7;
break;
case 'A':
order = 9;
break;
case 'B':
order = 11;
break;
}
if(line[1]=='b'){
order--;
} else if(line[1]=='#'){
order++;
}
return order;
}
double getFreq(char *line){
if(line[0]=='R'){
return 0.0;
}
int noteIndex = getNoteOrder(line);
int octave = getOctave(line);
printf("octable %d\n",octave);
double keyNum = 12*octave + noteIndex - 8;
printf("Key Num: %lf\n",keyNum);
return pow(2,(keyNum - 49.0)/12.0)*440.0;
}
int getDuration(char *line){
char d = 4;
if(line[1] == '#' || line[1] == 'b'){
d= line[3];
} else {
d= line[2];
}
if(d=='F'){
d = 16;
} else if(d == 'H'){
d = 8;
} else if(d == 'Q' || d == '4'){
d=4;
} else if(d == '2'){
d = 2;
} else if(d=='1'){
d = 1;
}
if(d>16 || d < 1){
return 4;
}
return d;
}
int parseWords(char * line,char buff[500][500]){
int i=0;
int j=0;
int k=0;
while(line[i]!='\n' && line[i]!='\r' && line[i] != '\0'){
while(line[i] != ' ' && line[i]!='\n' && line[i] !='\r' && line[i] != '\0'){
buff[j][k++]=line[i];
i++;
}
if(k>0){
buff[j][k]='\0';
k=0;
j++;
}
if(line[i]==' '){
i++;
}
}
return j;
}
int readFreqs(char * fileName,double *freqs,int * duration) {
FILE *f = fopen(fileName,"r");
char line[1024];
char words[500][500];
int i=0;
int j=0;
while(fgets(line,sizeof(line),f)){
if(line[0]=='#'){
printf("%s\n",line);
continue; //ignore comments
}
int num_words = parseWords(line,words);
for(j=0;j<num_words;j++){
freqs[i]=getFreq(words[j]);
duration[i++]=getDuration(words[j]);
printf("%lf\n",freqs[i-1]);
}
}
fclose(f);
return i;
}
int getTotalDuration(int* duration,int num_notes){
int total_duration=0;
int z=0;
for(z=0;z<num_notes;z++){
total_duration+=duration[z];
}
return total_duration;
}
void generateSamples(int NUM_NOTES,double* freqs,int* duration,int total_samples,short* waveform){
int volume = 32000;
int k;
int l=0;
int i;
printf("start generating samples\n");
for(k=0;k<NUM_NOTES;k++){
int NUM_SAMPLES = (duration[k]*WAVFILE_SAMPLES_PER_SECOND)/16;
if(freqs[k] < 2){ //silence
for(i=0;i<NUM_SAMPLES;i++){
waveform[l++]=0;
}
continue;
}
double damping_factor = pow(0.000001,16.0/(duration[k]*freqs[k])); //
printf("damping %lf\n",damping_factor);
int delay_line = (int) (((double)WAVFILE_SAMPLES_PER_SECOND)/freqs[k]);
printf("delay_line %d\n",delay_line);
int repeat = (int) (freqs[k] * (double) duration[k])/16.0;
printf("repeat %d\n",repeat);
int j;
int x_i;
int y_i;
for(i=0;i<delay_line;i++){
waveform[l++] = volume*((double)rand()/RAND_MAX);
}
for(j=1;j<repeat;j++){
for(i=0;i<delay_line;i++){
x_i = waveform[l-delay_line];
y_i = waveform[l-1];
waveform[l++] = y_i + damping_factor*(x_i-y_i);
}
}
}
//printf("total_samples_generated %d\n",l);
while(l<total_samples){
waveform[l++]=0;
}
}
int main(int argc, char** argv)
{
if(argc < 2){
printf("Usage : ./example <filename>\n");
return 0;
}
int NUM_NOTES2 = 0;
if(argc > 2){
NUM_NOTES2 = readFreqs(argv[2],freqs2,duration2);
}
int NUM_NOTES = readFreqs(argv[1],freqs,duration);
int total_duration = getTotalDuration(duration,NUM_NOTES);
int total_duration2 = getTotalDuration(duration2,NUM_NOTES2);
int total_samples = (total_duration*WAVFILE_SAMPLES_PER_SECOND)/16+16;
int total_samples2 = (total_duration2*WAVFILE_SAMPLES_PER_SECOND)/16+16;
printf("total_samples %d\n",total_samples);
int volume = 32000;
int length = NUM_SAMPLES;
// gen karplus strong samples
generateSamples(NUM_NOTES,freqs,duration,total_samples,waveform);
generateSamples(NUM_NOTES2,freqs2,duration2,total_samples2,waveform2);
/*
int k;
int l=0;
int i;
printf("start generating samples\n");
for(k=0;k<NUM_NOTES;k++){
int NUM_SAMPLES = (duration[k]*WAVFILE_SAMPLES_PER_SECOND)/16;
if(freqs[k] < 2){ //silence
for(i=0;i<NUM_SAMPLES;i++){
waveform[l++]=0;
}
continue;
}
double damping_factor = pow(0.000001,16.0/(duration[k]*freqs[k])); //
printf("damping %lf\n",damping_factor);
int delay_line = (int) (((double)WAVFILE_SAMPLES_PER_SECOND)/freqs[k]);
printf("delay_line %d\n",delay_line);
int repeat = (int) (freqs[k] * (double) duration[k])/16.0;
printf("repeat %d\n",repeat);
int j;
int x_i;
int y_i;
for(i=0;i<delay_line;i++){
waveform[l++] = volume*((double)rand()/RAND_MAX);
}
for(j=1;j<repeat;j++){
for(i=0;i<delay_line;i++){
x_i = waveform[l-delay_line];
y_i = waveform[l-1];
waveform[l++] = y_i + damping_factor*(x_i-y_i);
}
}
}
//printf("total_samples_generated %d\n",l);
while(l<total_samples){
waveform[l++]=0;
}
*/
/*
gen pure tone samples
int i;
int k;
int l=0;
for(k=0;k<NUM_NOTES;k++){
int NUM_SAMPLES = (duration[k]*WAVFILE_SAMPLES_PER_SECOND)/16;
for(i=0;i<NUM_SAMPLES;i++) {
double t = (double) i / WAVFILE_SAMPLES_PER_SECOND;
waveform[l++] = volume*sin(freqs[k]*t*2*M_PI);
}
}
*/
int l=0;
while(l<total_samples2){
if(waveform2[l]>1){
waveform[l] = (waveform[l] + waveform2[l])/2;
}
l++;
}
FILE * f = wavfile_open("sound.wav");
if(!f) {
printf("couldn't open sound.wav for writing: %s",strerror(errno));
return 1;
}
wavfile_write(f,waveform,total_samples);
wavfile_close(f);
return 0;
}