Mercurial > hg > beaglert
diff examples/04-Audio/filter-IIR/main.cpp @ 464:8fcfbfb32aa0 prerelease
Examples reorder with subdirectories. Added header to each project. Moved Doxygen to bottom of render.cpp.
author | Robert Jack <robert.h.jack@gmail.com> |
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date | Mon, 20 Jun 2016 16:20:38 +0100 |
parents | |
children | cdabbaf3a252 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/examples/04-Audio/filter-IIR/main.cpp Mon Jun 20 16:20:38 2016 +0100 @@ -0,0 +1,202 @@ +/* + ____ _____ _ _ +| __ )| ____| | / \ +| _ \| _| | | / _ \ +| |_) | |___| |___ / ___ \ +|____/|_____|_____/_/ \_\ + +The platform for ultra-low latency audio and sensor processing + +http://bela.io + +A project of the Augmented Instruments Laboratory within the +Centre for Digital Music at Queen Mary University of London. +http://www.eecs.qmul.ac.uk/~andrewm + +(c) 2016 Augmented Instruments Laboratory: Andrew McPherson, + Astrid Bin, Liam Donovan, Christian Heinrichs, Robert Jack, + Giulio Moro, Laurel Pardue, Victor Zappi. All rights reserved. + +The Bela software is distributed under the GNU Lesser General Public License +(LGPL 3.0), available here: https://www.gnu.org/licenses/lgpl-3.0.txt +*/ + +#include <iostream> +#include <cstdlib> +#include <libgen.h> +#include <signal.h> +#include <string> +#include <getopt.h> +#include <sndfile.h> // to load audio files + +#include <Bela.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; + + Bela_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[]) +{ + BelaInitSettings 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 + Bela_defaultSettings(&settings); + + // Parse command-line arguments + while (1) { + int c; + if ((c = Bela_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(Bela_initAudio(&settings, &sampleData) != 0) { + cout << "Error: unable to initialise audio" << endl; + return -1; + } + + // Start the audio device running + if(Bela_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 + Bela_stopAudio(); + + // Clean up any resources allocated for audio + Bela_cleanupAudio(); + + // All done! + return 0; +} +