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chordextract.cpp
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chordextract.cpp
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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
/*
NNLS-Chroma / Chordino
Audio feature extraction plugins for chromagram and chord
estimation.
Centre for Digital Music, Queen Mary University of London.
This file copyright 2014 QMUL.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version. See the file
COPYING included with this distribution for more information.
*/
/*
Extract chords from an audio file, read using libsndfile. Works by
constructing the plugin as a C++ class directly, and using plugin
adapters from the Vamp Host SDK to provide input.
You can compile this with e.g. the following (Linux example):
$ g++ -D_VAMP_PLUGIN_IN_HOST_NAMESPACE -O2 -ffast-math chordextract.cpp Chordino.cpp NNLSBase.cpp chromamethods.cpp viterbi.cpp nnls.c -o chordextract -lsndfile -lvamp-hostsdk -ldl
But the same idea should work on any platform, so long as the Boost
Tokenizer headers and the Vamp Host SDK library are available and
the _VAMP_PLUGIN_IN_HOST_NAMESPACE preprocessor symbol is defined
throughout.
*/
#define _VAMP_PLUGIN_IN_HOST_NAMESPACE 1
#include <vamp-hostsdk/PluginInputDomainAdapter.h>
#include <vamp-hostsdk/PluginBufferingAdapter.h>
#include "Chordino.h"
#include <sndfile.h>
#include <iostream>
#include <string>
using namespace std;
using namespace Vamp;
using namespace Vamp::HostExt;
int main(int argc, char **argv)
{
const char *myname = argv[0];
if (argc != 2) {
cerr << "usage: " << myname << " file.wav" << endl;
return 2;
}
const char *infile = argv[1];
SF_INFO sfinfo;
SNDFILE *sndfile = sf_open(infile, SFM_READ, &sfinfo);
if (!sndfile) {
cerr << myname << ": Failed to open input file " << infile
<< ": " << sf_strerror(sndfile) << endl;
return 1;
}
Chordino *chordino = new Chordino(sfinfo.samplerate);
PluginInputDomainAdapter *ia = new PluginInputDomainAdapter(chordino);
ia->setProcessTimestampMethod(PluginInputDomainAdapter::ShiftData);
PluginBufferingAdapter *adapter = new PluginBufferingAdapter(ia);
int blocksize = adapter->getPreferredBlockSize();
// Plugin requires 1 channel (we will mix down)
if (!adapter->initialise(1, blocksize, blocksize)) {
cerr << myname << ": Failed to initialise Chordino adapter!" << endl;
return 1;
}
float *filebuf = new float[sfinfo.channels * blocksize];
float *mixbuf = new float[blocksize];
Plugin::FeatureList chordFeatures;
Plugin::FeatureSet fs;
int chordFeatureNo = -1;
Plugin::OutputList outputs = adapter->getOutputDescriptors();
for (int i = 0; i < int(outputs.size()); ++i) {
if (outputs[i].identifier == "simplechord") {
chordFeatureNo = i;
}
}
if (chordFeatureNo < 0) {
cerr << myname << ": Failed to identify chords output!" << endl;
return 1;
}
int frame = 0;
while (frame < sfinfo.frames) {
int count = -1;
if ((count = sf_readf_float(sndfile, filebuf, blocksize)) <= 0) break;
// mix down
for (int i = 0; i < blocksize; ++i) {
mixbuf[i] = 0.f;
if (i < count) {
for (int c = 0; c < sfinfo.channels; ++c) {
mixbuf[i] += filebuf[i * sfinfo.channels + c] / sfinfo.channels;
}
}
}
RealTime timestamp = RealTime::frame2RealTime(frame, sfinfo.samplerate);
// feed to plugin: can just take address of buffer, as only one channel
fs = adapter->process(&mixbuf, timestamp);
chordFeatures.insert(chordFeatures.end(),
fs[chordFeatureNo].begin(),
fs[chordFeatureNo].end());
frame += count;
}
sf_close(sndfile);
// features at end of processing (actually Chordino does all its work here)
fs = adapter->getRemainingFeatures();
// chord output is output index 0
chordFeatures.insert(chordFeatures.end(),
fs[chordFeatureNo].begin(),
fs[chordFeatureNo].end());
for (int i = 0; i < (int)chordFeatures.size(); ++i) {
cout << chordFeatures[i].timestamp.toString() << ": "
<< chordFeatures[i].label << endl;
}
delete[] filebuf;
delete[] mixbuf;
delete adapter;
}