68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
///////////////////////////////////////////////////////////////////////////////////////////////////
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// Tyler Perkins
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// 12-30-20
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// Testing command line audio
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <math.h>
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int main(int argc, char** argv){
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if(argc != 1){
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printf("Usage: %s\n", argv[0]);
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return -1;
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}
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//sawtooth wave
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for(int t=0, osc=0; t<8000; t++, osc += 14){
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putchar(osc);
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}
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//square wave
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for(int t=0, osc=0; t<8000; t++, osc += 14){
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putchar(osc & 0x80);
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}
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//sine wave
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for(int t=0, osc=0; t<8000; t++, osc += 14){
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putchar(127 * sin(osc/255.0*2*3.1415) + 128);
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}
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/* kinda bass guitar?
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*
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* The idea here is an array full of random data, with
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* an array size equal to the period of the wave
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* (for 440 its ~18) then loop the array.
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* Then we average out the current value and next one
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* Till we get a faded noise to silence
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*
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* Pretty cool ngl
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*/
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unsigned char a[18];
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//init the array with random data
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FILE *fp;
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fp = fopen("/dev/random", "r");
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if(fp == NULL){
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printf("Couldnt open random stream!\n");
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return -1;
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}
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if(fgets(a,sizeof(a),fp)==NULL){
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printf("Failed to read the random stream!\n");
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return -1;
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}
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fclose(fp);
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//play the bass guitar
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for(int t=0;t<8000;t++){
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int i = t % sizeof(a);
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int j = (t+1) % sizeof(a);
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putchar(a[i] = (a[i] + a[j])/2);
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}
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return 0;
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}
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