victor@3: /*
victor@3:  * main.cpp
victor@3:  *
victor@3:  *  Created on: Oct 24, 2014
victor@3:  *      Author: Andrew McPherson and Victor Zappi
victor@3:  */
victor@3: 
victor@3: #include <iostream>
victor@3: #include <cstdlib>
victor@3: #include <libgen.h>
victor@3: #include <signal.h>
victor@3: #include <string>
andrewm@5: #include <getopt.h>
victor@3: #include <sndfile.h>				// to load audio files
victor@3: #include "../../include/RTAudio.h"
victor@3: #include "SampleData.h"
victor@3: 
victor@3: using namespace std;
victor@3: 
victor@3: float gCutFreq = 100;
victor@3: 
victor@3: // Load samples from file
victor@3: int initFile(string file, SampleData *smp)//float *& smp)
victor@3: {
victor@3: 	SNDFILE *sndfile ;
victor@3: 	SF_INFO sfinfo ;
victor@3: 
victor@3: 	if (!(sndfile = sf_open (file.c_str(), SFM_READ, &sfinfo))) {
victor@3: 		cout << "Couldn't open file " << file << endl;
victor@3: 		return 1;
victor@3: 	}
victor@3: 
victor@3: 	int numChan = sfinfo.channels;
victor@3: 	if(numChan != 1)
victor@3: 	{
victor@3: 		cout << "Error: " << file << " is not a mono file" << endl;
victor@3: 		return 1;
victor@3: 	}
victor@3: 
victor@3: 	smp->sampleLen = sfinfo.frames * numChan;
victor@3: 	smp->samples = new float[smp->sampleLen];
victor@3: 	if(smp == NULL){
victor@3: 		cout << "Could not allocate buffer" << endl;
victor@3: 		return 1;
victor@3: 	}
victor@3: 
victor@3: 	int subformat = sfinfo.format & SF_FORMAT_SUBMASK;
victor@3: 	int readcount = sf_read_float(sndfile, smp->samples, smp->sampleLen);
victor@3: 
victor@3: 	// Pad with zeros in case we couldn't read whole file
victor@3: 	for(int k = readcount; k <smp->sampleLen; k++)
victor@3: 		smp->samples[k] = 0;
victor@3: 
victor@3: 	if (subformat == SF_FORMAT_FLOAT || subformat == SF_FORMAT_DOUBLE) {
victor@3: 		double	scale ;
victor@3: 		int 	m ;
victor@3: 
victor@3: 		sf_command (sndfile, SFC_CALC_SIGNAL_MAX, &scale, sizeof (scale)) ;
victor@3: 		if (scale < 1e-10)
victor@3: 			scale = 1.0 ;
victor@3: 		else
victor@3: 			scale = 32700.0 / scale ;
victor@3: 		cout << "File samples scale = " << scale << endl;
victor@3: 
victor@3: 		for (m = 0; m < smp->sampleLen; m++)
victor@3: 			smp->samples[m] *= scale;
victor@3: 	}
victor@3: 
victor@3: 	sf_close(sndfile);
victor@3: 
victor@3: 	return 0;
victor@3: }
victor@3: 
victor@3: // Handle Ctrl-C by requesting that the audio rendering stop
victor@3: void interrupt_handler(int var)
victor@3: {
victor@3: 	//rt_task_delete ((RT_TASK *) &gTriggerSamplesTask);
victor@3: 	gShouldStop = true;
victor@3: }
victor@3: 
victor@3: // Print usage information
victor@3: void usage(const char * processName)
victor@3: {
andrewm@5: 	cerr << "Usage: " << processName << " [options]" << endl;
andrewm@5: 
andrewm@5: 	BeagleRT_usage();
andrewm@5: 
andrewm@5: 	cerr << "   --file [-f] filename:    Name of the file to load (default is \"longsample.wav\")\n";
andrewm@5: 	cerr << "   --cutfreq [-c] freq:     Set the cut off frequency of the filter in Hz\n";
andrewm@5: 	cerr << "   --help [-h]:             Print this menu\n";
victor@3: }
victor@3: 
victor@3: int main(int argc, char *argv[])
victor@3: {
andrewm@5: 	RTAudioSettings settings;	// Standard audio settings
victor@3: 	string fileName;			// Name of the sample to load
victor@3: 
victor@3: 	SampleData sampleData;		// User define structure to pass data retrieved from file to render function
victor@3: 	sampleData.samples = 0;
victor@3: 	sampleData.sampleLen = -1;
victor@3: 
andrewm@5: 
andrewm@5: 	struct option customOptions[] =
andrewm@5: 	{
andrewm@5: 		{"help", 0, NULL, 'h'},
andrewm@5: 		{"cutfreq", 1, NULL, 'c'},
andrewm@5: 		{"file", 1, NULL, 'f'},
andrewm@5: 		{NULL, 0, NULL, 0}
andrewm@5: 	};
andrewm@5: 
andrewm@5: 	// Set default settings
andrewm@5: 	BeagleRT_defaultSettings(&settings);
andrewm@5: 
victor@3: 	// Parse command-line arguments
victor@3: 	while (1) {
victor@3: 		int c;
andrewm@5: 		if ((c = BeagleRT_getopt_long(argc, argv, "hf:c:", customOptions, &settings)) < 0)
victor@3: 				break;
victor@3: 		switch (c) {
victor@3: 		case 'h':
victor@3: 				usage(basename(argv[0]));
victor@3: 				exit(0);
victor@3: 		case 'f':
victor@3: 				fileName = string((char *)optarg);
victor@3: 				break;
victor@3: 		case 'c':
victor@3: 				gCutFreq = atof(optarg);
victor@3: 				break;
victor@3: 		case '?':
victor@3: 		default:
victor@3: 				usage(basename(argv[0]));
victor@3: 				exit(1);
victor@3: 		}
victor@3: 	}
victor@3: 
victor@3: 	if(fileName.empty()){
andrewm@5: 		fileName = "longsample.wav";
victor@3: 	}
victor@3: 
andrewm@5: 	if(settings.verbose) {
victor@3: 		cout << "Loading file " << fileName << endl;
victor@3: 	}
victor@3: 
victor@3: 	// Load file
victor@3: 	if(initFile(fileName, &sampleData) != 0)
victor@3: 	{
victor@3: 		cout << "Error: unable to load samples " << endl;
victor@3: 		return -1;
victor@3: 	}
victor@3: 
andrewm@5: 	if(settings.verbose)
victor@3: 		cout << "File contains " << sampleData.sampleLen << " samples" << endl;
victor@3: 
andrewm@5: 
victor@3: 	// Initialise the PRU audio device
andrewm@5: 	if(BeagleRT_initAudio(&settings, &sampleData) != 0) {
victor@3: 		cout << "Error: unable to initialise audio" << endl;
victor@3: 		return -1;
victor@3: 	}
victor@3: 
victor@3: 	// Start the audio device running
andrewm@5: 	if(BeagleRT_startAudio()) {
victor@3: 		cout << "Error: unable to start real-time audio" << endl;
victor@3: 		return -1;
victor@3: 	}
victor@3: 
victor@3: 	// Set up interrupt handler to catch Control-C
victor@3: 	signal(SIGINT, interrupt_handler);
victor@3: 
victor@3: 	// Run until told to stop
victor@3: 	while(!gShouldStop) {
victor@3: 		usleep(100000);
victor@3: 	}
victor@3: 
victor@3: 	// Stop the audio device
andrewm@5: 	BeagleRT_stopAudio();
victor@3: 
victor@3: 	// Clean up any resources allocated for audio
andrewm@5: 	BeagleRT_cleanupAudio();
victor@3: 
victor@3: 	// All done!
victor@3: 	return 0;
victor@3: }
andrewm@5: