robert@464: /*
robert@464:  ____  _____ _        _    
robert@464: | __ )| ____| |      / \   
robert@464: |  _ \|  _| | |     / _ \  
robert@464: | |_) | |___| |___ / ___ \ 
robert@464: |____/|_____|_____/_/   \_\
robert@464: 
robert@464: The platform for ultra-low latency audio and sensor processing
robert@464: 
robert@464: http://bela.io
robert@464: 
robert@464: A project of the Augmented Instruments Laboratory within the
robert@464: Centre for Digital Music at Queen Mary University of London.
robert@464: http://www.eecs.qmul.ac.uk/~andrewm
robert@464: 
robert@464: (c) 2016 Augmented Instruments Laboratory: Andrew McPherson,
robert@464:   Astrid Bin, Liam Donovan, Christian Heinrichs, Robert Jack,
robert@464:   Giulio Moro, Laurel Pardue, Victor Zappi. All rights reserved.
robert@464: 
robert@464: The Bela software is distributed under the GNU Lesser General Public License
robert@464: (LGPL 3.0), available here: https://www.gnu.org/licenses/lgpl-3.0.txt
robert@464: */
robert@464: 
robert@464: #include <iostream>
robert@464: #include <cstdlib>
robert@464: #include <libgen.h>
robert@464: #include <signal.h>
robert@464: #include <string>
robert@464: #include <getopt.h>
robert@464: #include <sndfile.h>				// to load audio files
robert@464: 
robert@464: #include <Bela.h>
robert@464: #include "SampleData.h"
robert@464: 
robert@464: using namespace std;
robert@464: 
robert@464: // Load samples from file
robert@464: int initFile(string file, SampleData *smp)//float *& smp)
robert@464: {
robert@464: 	SNDFILE *sndfile ;
robert@464: 	SF_INFO sfinfo ;
robert@464: 
robert@464: 	if (!(sndfile = sf_open (file.c_str(), SFM_READ, &sfinfo))) {
robert@464: 		cout << "Couldn't open file " << file << endl;
robert@464: 		return 1;
robert@464: 	}
robert@464: 
robert@464: 	int numChan = sfinfo.channels;
robert@464: 	if(numChan != 1)
robert@464: 	{
robert@464: 		cout << "Error: " << file << " is not a mono file" << endl;
robert@464: 		return 1;
robert@464: 	}
robert@464: 
robert@464: 	smp->sampleLen = sfinfo.frames * numChan;
robert@464: 	smp->samples = new float[smp->sampleLen];
robert@464: 	if(smp == NULL){
robert@464: 		cout << "Could not allocate buffer" << endl;
robert@464: 		return 1;
robert@464: 	}
robert@464: 
robert@464: 	int subformat = sfinfo.format & SF_FORMAT_SUBMASK;
robert@464: 	int readcount = sf_read_float(sndfile, smp->samples, smp->sampleLen);
robert@464: 
robert@464: 	// Pad with zeros in case we couldn't read whole file
robert@464: 	for(int k = readcount; k <smp->sampleLen; k++)
robert@464: 		smp->samples[k] = 0;
robert@464: 
robert@464: 	if (subformat == SF_FORMAT_FLOAT || subformat == SF_FORMAT_DOUBLE) {
robert@464: 		double	scale ;
robert@464: 		int 	m ;
robert@464: 
robert@464: 		sf_command (sndfile, SFC_CALC_SIGNAL_MAX, &scale, sizeof (scale)) ;
robert@464: 		if (scale < 1e-10)
robert@464: 			scale = 1.0 ;
robert@464: 		else
robert@464: 			scale = 32700.0 / scale ;
robert@464: 		cout << "File samples scale = " << scale << endl;
robert@464: 
robert@464: 		for (m = 0; m < smp->sampleLen; m++)
robert@464: 			smp->samples[m] *= scale;
robert@464: 	}
robert@464: 
robert@464: 	sf_close(sndfile);
robert@464: 
robert@464: 	return 0;
robert@464: }
robert@464: 
robert@464: 
robert@464: // Handle Ctrl-C by requesting that the audio rendering stop
robert@464: void interrupt_handler(int var)
robert@464: {
robert@464: 	//rt_task_delete ((RT_TASK *) &gTriggerSamplesTask);
robert@464: 	gShouldStop = true;
robert@464: }
robert@464: 
robert@464: // Print usage information
robert@464: void usage(const char * processName)
robert@464: {
robert@464: 	cerr << "Usage: " << processName << " [options]" << endl;
robert@464: 
robert@464: 	Bela_usage();
robert@464: 
robert@464: 	cerr << "   --file [-f] filename:    Name of the file to load (default is \"longsample.wav\")\n";
robert@464: 	cerr << "   --help [-h]:             Print this menu\n";
robert@464: }
robert@464: 
robert@464: int main(int argc, char *argv[])
robert@464: {
robert@464: 	BelaInitSettings settings;	// Standard audio settings
robert@464: 	string fileName;			// Name of the sample to load
robert@464: 
robert@464: 	SampleData sampleData;		// User define structure to pass data retrieved from file to render function
robert@464: 	sampleData.samples = 0;
robert@464: 	sampleData.sampleLen = -1;
robert@464: 
robert@464: 
robert@464: 	struct option customOptions[] =
robert@464: 	{
robert@464: 		{"help", 0, NULL, 'h'},
robert@464: 		{"file", 1, NULL, 'f'},
robert@464: 		{NULL, 0, NULL, 0}
robert@464: 	};
robert@464: 
robert@464: 	// Set default settings
robert@464: 	Bela_defaultSettings(&settings);
robert@464: 
robert@464: 	// Parse command-line arguments
robert@464: 	while (1) {
robert@464: 		int c;
robert@464: 		if ((c = Bela_getopt_long(argc, argv, "hf:", customOptions, &settings)) < 0)
robert@464: 				break;
robert@464: 		switch (c) {
robert@464: 		case 'h':
robert@464: 				usage(basename(argv[0]));
robert@464: 				exit(0);
robert@464: 		case 'f':
robert@464: 				fileName = string((char *)optarg);
robert@464: 				break;
robert@464: 		case '?':
robert@464: 		default:
robert@464: 				usage(basename(argv[0]));
robert@464: 				exit(1);
robert@464: 		}
robert@464: 	}
robert@464: 
robert@464: 	if(fileName.empty()){
robert@464: 		fileName = "filter/longsample.wav";
robert@464: 	}
robert@464: 
robert@464: 	if(settings.verbose) {
robert@464: 		cout << "Loading file " << fileName << endl;
robert@464: 	}
robert@464: 
robert@464: 	// Load file
robert@464: 	if(initFile(fileName, &sampleData) != 0)
robert@464: 	{
robert@464: 		cout << "Error: unable to load samples " << endl;
robert@464: 		return -1;
robert@464: 	}
robert@464: 
robert@464: 	if(settings.verbose)
robert@464: 		cout << "File contains " << sampleData.sampleLen << " samples" << endl;
robert@464: 
robert@464: 
robert@464: 	// Initialise the PRU audio device
robert@464: 	if(Bela_initAudio(&settings, &sampleData) != 0) {
robert@464: 		cout << "Error: unable to initialise audio" << endl;
robert@464: 		return -1;
robert@464: 	}
robert@464: 
robert@464: 	// Start the audio device running
robert@464: 	if(Bela_startAudio()) {
robert@464: 		cout << "Error: unable to start real-time audio" << endl;
robert@464: 		return -1;
robert@464: 	}
robert@464: 
robert@464: 	// Set up interrupt handler to catch Control-C and SIGTERM
robert@464: 	signal(SIGINT, interrupt_handler);
robert@464: 	signal(SIGTERM, interrupt_handler);
robert@464: 
robert@464: 	// Run until told to stop
robert@464: 	while(!gShouldStop) {
robert@464: 		usleep(100000);
robert@464: 	}
robert@464: 
robert@464: 	// Stop the audio device
robert@464: 	Bela_stopAudio();
robert@464: 
robert@464: 	// Clean up any resources allocated for audio
robert@464: 	Bela_cleanupAudio();
robert@464: 
robert@464: 	// All done!
robert@464: 	return 0;
robert@464: }
robert@464: