diff projects/audio_in_FFT/main.cpp @ 4:f34c63568523

_new FFT example [still noisy]

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/projects/audio_in_FFT/main.cpp	Thu Nov 06 19:02:48 2014 +0000
@@ -0,0 +1,114 @@
+/*
+ * main.cpp
+ *
+ *  Created on: Oct 24, 2014
+ *      Author: parallels
+ */
+
+#include <iostream>
+#include <cstdlib>
+#include <libgen.h>
+#include <signal.h>
+#include "../../include/RTAudio.h"
+
+using namespace std;
+
+// Handle Ctrl-C by requesting that the audio rendering stop
+void interrupt_handler(int var)
+{
+	gShouldStop = true;
+}
+
+// Print usage information
+void usage(const char * processName)
+{
+	cerr << "Usage: " << processName << " [-h] [-v] [-p period] [-f frequency]" << endl;
+	cerr << "   -h:           Print this menu\n";
+	cerr << "   -v:           Enable verbose messages\n";
+	cerr << "   -p period:    Set the period (hardware buffer) size in sensor frames\n";
+	cerr << "   -s fftsize:   Set the fSize of the FFT, in samples\n";
+	cerr << "   -m:           Enable the matrix (ADC and DAC) as well as audio\n";
+}
+
+int main(int argc, char *argv[])
+{
+	int periodSize = 8;			// Period size in sensor frames
+	int verbose = 0;			// Verbose printing level
+	int fftSize = 64;		    // Size of the FFT, in samples
+	int useMatrix = 0;			// Whether to use the matrix or just audio
+
+	// Parse command-line arguments
+	while (1) {
+		int c;
+		if ((c = getopt(argc, argv, "hp:vf:m")) < 0)
+				break;
+		switch (c) {
+		case 'h':
+				usage(basename(argv[0]));
+				exit(0);
+		case 'p':
+				periodSize = atoi(optarg);
+				if(periodSize < 1)
+					periodSize = 1;
+				break;
+		case 'v':
+				verbose = 1;
+				break;
+		case 's':
+				fftSize = atof(optarg);
+				break;
+		case 'm':
+				useMatrix = 1;
+				break;
+		case '?':
+		default:
+				usage(basename(argv[0]));
+				exit(1);
+		}
+	}
+
+
+	// Set verbose logging information (optional by using value > 0; default is 0)
+	setVerboseLevel(verbose);
+
+	if(verbose) {
+		cout << "Starting with period size " << periodSize << " and FFT size " << fftSize << endl;
+		if(useMatrix)
+			cout << "Matrix enabled\n";
+		else
+			cout << "Matrix disabled\n";
+	}
+
+	// Initialise the PRU audio device
+	if(initAudio(periodSize, useMatrix, &fftSize) != 0) {
+		cout << "Error: unable to initialise audio" << endl;
+		return -1;
+	}
+
+	// Start the audio device running
+	if(startAudio()) {
+		cout << "Error: unable to start real-time audio" << endl;
+		return -1;
+	}
+
+	// Set up interrupt handler to catch Control-C
+	signal(SIGINT, interrupt_handler);
+
+	// Run until told to stop
+	while(!gShouldStop) {
+		usleep(100000);
+	}
+
+	// Stop the audio device
+	stopAudio();
+
+	if(verbose) {
+		cout << "Cleaning up..." << endl;
+	}
+
+	// Clean up any resources allocated for audio
+	cleanupAudio();
+
+	// All done!
+	return 0;
+}