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/******************************************/
/*
twostreams.cpp
by Gary P. Scavone, 2001
Text executable for audio playback,
recording, duplex operation, stopping,
starting, and aborting operations.
Takes number of channels and sample
rate as input arguments. Runs input
and output through two separate streams.
Uses blocking functionality.
*/
/******************************************/
#include "RtAudio.h"
#include <iostream.h>
#include <stdio.h>
/*
typedef signed long MY_TYPE;
#define FORMAT RtAudio::RTAUDIO_SINT24
#define SCALE 2147483647.0
typedef char MY_TYPE;
#define FORMAT RtAudio::RTAUDIO_SINT8
#define SCALE 127.0
typedef signed short MY_TYPE;
#define FORMAT RtAudio::RTAUDIO_SINT16
#define SCALE 32767.0
typedef signed long MY_TYPE;
#define FORMAT RtAudio::RTAUDIO_SINT32
#define SCALE 2147483647.0
typedef float MY_TYPE;
#define FORMAT RtAudio::RTAUDIO_FLOAT32
#define SCALE 1.0
*/
typedef double MY_TYPE;
#define FORMAT RtAudio::RTAUDIO_FLOAT64
#define SCALE 1.0
#define BASE_RATE 0.005
#define TIME 2.0
void usage(void) {
/* Error function in case of incorrect command-line
argument specifications
*/
cout << "\nuseage: twostreams N fs\n";
cout << " where N = number of channels,\n";
cout << " and fs = the sample rate.\n\n";
exit(0);
}
int main(int argc, char *argv[])
{
int chans, fs, device, buffer_size, stream1, stream2;
long frames, counter = 0, i, j;
MY_TYPE *buffer1, *buffer2;
RtAudio *audio;
FILE *fd;
double *data;
// minimal command-line checking
if (argc != 3) usage();
chans = (int) atoi(argv[1]);
fs = (int) atoi(argv[2]);
// Open the realtime output device
buffer_size = 512;
device = 0; // default device
try {
audio = new RtAudio();
}
catch (RtAudioError &m) {
m.printMessage();
exit(EXIT_FAILURE);
}
try {
stream1 = audio->openStream(device, chans, 0, 0,
FORMAT, fs, &buffer_size, 8);
stream2 = audio->openStream(0, 0, device, chans,
FORMAT, fs, &buffer_size, 8);
buffer1 = (MY_TYPE *) audio->getStreamBuffer(stream1);
buffer2 = (MY_TYPE *) audio->getStreamBuffer(stream2);
}
catch (RtAudioError &m) {
m.printMessage();
goto cleanup;
}
frames = (long) (fs * TIME);
data = (double *) calloc(chans, sizeof(double));
try {
audio->startStream(stream1);
}
catch (RtAudioError &m) {
m.printMessage();
goto cleanup;
}
cout << "\nStarting sawtooth playback stream for " << TIME << " seconds." << endl;
while (counter < frames) {
for (i=0; i<buffer_size; i++) {
for (j=0; j<chans; j++) {
buffer1[i*chans+j] = (MY_TYPE) (data[j] * SCALE);
data[j] += BASE_RATE * (j+1+(j*0.1));
if (data[j] >= 1.0) data[j] -= 2.0;
}
}
try {
audio->tickStream(stream1);
}
catch (RtAudioError &m) {
m.printMessage();
goto cleanup;
}
counter += buffer_size;
}
cout << "\nStopping playback stream." << endl;
try {
audio->stopStream(stream1);
audio->startStream(stream2);
}
catch (RtAudioError &m) {
m.printMessage();
goto cleanup;
}
fd = fopen("test.raw","wb");
counter = 0;
cout << "\nStarting recording stream for " << TIME << " seconds." << endl;
while (counter < frames) {
try {
audio->tickStream(stream2);
}
catch (RtAudioError &m) {
m.printMessage();
goto cleanup;
}
fwrite(buffer2, sizeof(MY_TYPE), chans * buffer_size, fd);
counter += buffer_size;
}
fclose(fd);
cout << "\nAborting recording." << endl;
try {
audio->abortStream(stream2);
audio->startStream(stream1);
audio->startStream(stream2);
}
catch (RtAudioError &m) {
m.printMessage();
goto cleanup;
}
counter = 0;
cout << "\nStarting playback and record streams (quasi-duplex) for " << TIME << " seconds." << endl;
while (counter < frames) {
try {
audio->tickStream(stream2);
memcpy(buffer1, buffer2, sizeof(MY_TYPE) * chans * buffer_size);
audio->tickStream(stream1);
}
catch (RtAudioError &m) {
m.printMessage();
goto cleanup;
}
counter += buffer_size;
}
cout << "\nStopping both streams." << endl;
try {
audio->stopStream(stream1);
audio->stopStream(stream2);
}
catch (RtAudioError &m) {
m.printMessage();
}
cleanup:
audio->closeStream(stream1);
audio->closeStream(stream2);
delete audio;
if (data) free(data);
return 0;
}
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