annotate projects/filter_IIR/main.cpp @ 45:579c86316008 newapi

Major API overhaul. Moved to a single data structure for handling render functions. Functionally, generally similar except for scheduling within PRU loop function, which now uses interrupts from the PRU rather than polling. This requires an updated kernel.

/*
 * main.cpp
 *
 *  Created on: Oct 24, 2014
 *      Author: Andrew McPherson and Victor Zappi
 */

#include <iostream>
#include <cstdlib>
#include <libgen.h>
#include <signal.h>
#include <string>
#include <getopt.h>
#include <sndfile.h>				// to load audio files
#include "../../include/RTAudio.h"
#include "SampleData.h"

using namespace std;

float gCutFreq = 100;

// Load samples from file
int initFile(string file, SampleData *smp)//float *& smp)
{
	SNDFILE *sndfile ;
	SF_INFO sfinfo ;

	if (!(sndfile = sf_open (file.c_str(), SFM_READ, &sfinfo))) {
		cout << "Couldn't open file " << file << endl;
		return 1;
	}

	int numChan = sfinfo.channels;
	if(numChan != 1)
	{
		cout << "Error: " << file << " is not a mono file" << endl;
		return 1;
	}

	smp->sampleLen = sfinfo.frames * numChan;
	smp->samples = new float[smp->sampleLen];
	if(smp == NULL){
		cout << "Could not allocate buffer" << endl;
		return 1;
	}

	int subformat = sfinfo.format & SF_FORMAT_SUBMASK;
	int readcount = sf_read_float(sndfile, smp->samples, smp->sampleLen);

	// Pad with zeros in case we couldn't read whole file
	for(int k = readcount; k <smp->sampleLen; k++)
		smp->samples[k] = 0;

	if (subformat == SF_FORMAT_FLOAT || subformat == SF_FORMAT_DOUBLE) {
		double	scale ;
		int 	m ;

		sf_command (sndfile, SFC_CALC_SIGNAL_MAX, &scale, sizeof (scale)) ;
		if (scale < 1e-10)
			scale = 1.0 ;
		else
			scale = 32700.0 / scale ;
		cout << "File samples scale = " << scale << endl;

		for (m = 0; m < smp->sampleLen; m++)
			smp->samples[m] *= scale;
	}

	sf_close(sndfile);

	return 0;
}

// Handle Ctrl-C by requesting that the audio rendering stop
void interrupt_handler(int var)
{
	//rt_task_delete ((RT_TASK *) &gTriggerSamplesTask);
	gShouldStop = true;
}

// Print usage information
void usage(const char * processName)
{
	cerr << "Usage: " << processName << " [options]" << endl;

	BeagleRT_usage();

	cerr << "   --file [-f] filename:    Name of the file to load (default is \"longsample.wav\")\n";
	cerr << "   --cutfreq [-c] freq:     Set the cut off frequency of the filter in Hz\n";
	cerr << "   --help [-h]:             Print this menu\n";
}

int main(int argc, char *argv[])
{
	RTAudioSettings settings;	// Standard audio settings
	string fileName;			// Name of the sample to load

	SampleData sampleData;		// User define structure to pass data retrieved from file to render function
	sampleData.samples = 0;
	sampleData.sampleLen = -1;


	struct option customOptions[] =
	{
		{"help", 0, NULL, 'h'},
		{"cutfreq", 1, NULL, 'c'},
		{"file", 1, NULL, 'f'},
		{NULL, 0, NULL, 0}
	};

	// Set default settings
	BeagleRT_defaultSettings(&settings);

	// Parse command-line arguments
	while (1) {
		int c;
		if ((c = BeagleRT_getopt_long(argc, argv, "hf:c:", customOptions, &settings)) < 0)
				break;
		switch (c) {
		case 'h':
				usage(basename(argv[0]));
				exit(0);
		case 'f':
				fileName = string((char *)optarg);
				break;
		case 'c':
				gCutFreq = atof(optarg);
				break;
		case '?':
		default:
				usage(basename(argv[0]));
				exit(1);
		}
	}

	if(fileName.empty()){
		fileName = "filter/longsample.wav";
	}

	if(settings.verbose) {
		cout << "Loading file " << fileName << endl;
	}

	// Load file
	if(initFile(fileName, &sampleData) != 0)
	{
		cout << "Error: unable to load samples " << endl;
		return -1;
	}

	if(settings.verbose)
		cout << "File contains " << sampleData.sampleLen << " samples" << endl;


	// Initialise the PRU audio device
	if(BeagleRT_initAudio(&settings, &sampleData) != 0) {
		cout << "Error: unable to initialise audio" << endl;
		return -1;
	}

	// Start the audio device running
	if(BeagleRT_startAudio()) {
		cout << "Error: unable to start real-time audio" << endl;
		return -1;
	}

	// Set up interrupt handler to catch Control-C and SIGTERM
	signal(SIGINT, interrupt_handler);
	signal(SIGTERM, interrupt_handler);

	// Run until told to stop
	while(!gShouldStop) {
		usleep(100000);
	}

	// Stop the audio device
	BeagleRT_stopAudio();

	// Clean up any resources allocated for audio
	BeagleRT_cleanupAudio();

	// All done!
	return 0;
}