diff qm-dsp-decimate/decimate.cpp @ 15:e35d83f7b4f0

Add command line program for qm-dsp decimator

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/qm-dsp-decimate/decimate.cpp	Fri Oct 18 13:08:00 2013 +0100
@@ -0,0 +1,202 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+#include "qm-dsp/dsp/rateconversion/Decimator.h"
+#include "qm-dsp/maths/MathUtilities.h"
+
+#include <iostream>
+#include <sndfile.h>
+#include <time.h>
+#include <string>
+#include <cstdlib>
+#include <cstring>
+#include <cmath>
+#include <getopt.h>
+#include <unistd.h>
+#include <sys/time.h>
+
+using namespace std;
+
+int main(int argc, char **argv)
+{
+    int factor = 0;
+    bool version = false;
+    bool help = false;
+    int c = 0;
+
+    while (1) {
+        int optionIndex = 0;
+
+        static struct option longOpts[] = {
+            { "help",          0, 0, 'h' },
+            { "version",       0, 0, 'V' },
+            { "by",            1, 0, 'b' },
+            { 0, 0, 0, 0 }
+        };
+
+        c = getopt_long(argc, argv,
+                        "b:hV",
+                        longOpts, &optionIndex);
+        if (c == -1) break;
+
+        switch (c) {
+        case 'h': help = true; break;
+        case 'V': version = true; break;
+        case 'b': factor = atoi(optarg); break;
+        default:  help = true; break;
+        }
+    }
+
+    if (version) {
+	cerr << "decimate v0.1" << endl; //!!!
+	return 0;
+    }
+
+    if (help || factor == 0 || optind + 2 != argc) {
+	cerr << endl;
+	cerr << "usage: " << argv[0] << " --by <factor> <infile.wav> <outfile.wav>" << endl;
+	cerr << endl;
+	return 2;
+    }
+
+    if (!MathUtilities::isPowerOfTwo(factor)) {
+        cerr << "ERROR: Factor must be a power of two" << endl;
+        return 1;
+    }
+    if (factor < 2 || factor > Decimator::getHighestSupportedFactor()) {
+        cerr << "ERROR: Only factors between 2 and "
+             << Decimator::getHighestSupportedFactor() 
+             << " inclusive are supported" <<endl;
+        return 1;
+    }
+    
+    timeval tv;
+    (void)gettimeofday(&tv, 0);
+
+    char *fileName = strdup(argv[optind++]);
+    char *fileNameOut = strdup(argv[optind++]);
+
+    SNDFILE *sndfile;
+    SNDFILE *sndfileOut;
+    SF_INFO sfinfo;
+    SF_INFO sfinfoOut;
+    memset(&sfinfo, 0, sizeof(SF_INFO));
+
+    sndfile = sf_open(fileName, SFM_READ, &sfinfo);
+    if (!sndfile) {
+	cerr << "ERROR: Failed to open input file \"" << fileName << "\": "
+	     << sf_strerror(sndfile) << endl;
+	return 1;
+    }
+
+    int sourceRate = sfinfo.samplerate;
+    int targetRate = sourceRate / factor;
+
+    if (sourceRate % factor != 0) {
+        cerr << "WARNING: Decimation factor " << factor << " from source rate "
+             << sourceRate << " gives non-integral target rate (not supported "
+             << "by output file format), recording as " << targetRate << endl;
+    }
+
+    sfinfoOut.channels = sfinfo.channels;
+    sfinfoOut.format = sfinfo.format;
+    sfinfoOut.frames = sfinfo.frames / factor;
+    sfinfoOut.samplerate = targetRate;
+    sfinfoOut.sections = sfinfo.sections;
+    sfinfoOut.seekable = sfinfo.seekable;
+
+    sndfileOut = sf_open(fileNameOut, SFM_WRITE, &sfinfoOut);
+    if (!sndfileOut) {
+	cerr << "ERROR: Failed to open output file \"" << fileNameOut << "\" for writing: "
+	     << sf_strerror(sndfileOut) << endl;
+	return 1;
+    }
+
+    int channels = sfinfo.channels;
+    vector<Decimator *> decimators; // one per channel
+
+    int ibs = 1024;
+    int obs = ibs / factor;
+
+    for (int c = 0; c < channels; ++c) {
+	decimators.push_back(new Decimator(ibs, factor));
+    }
+
+    float *ibuf = new float[channels * ibs];
+    float *obuf = new float[channels * obs];
+    
+    double **prebuf = new double*[channels];
+    double **postbuf = new double*[channels];
+
+    for (int c = 0; c < channels; ++c) {
+	prebuf[c] = new double[ibs];
+	postbuf[c] = new double[obs];
+    }
+    
+    int n = 0;
+    
+    while (true) {
+
+	int count = sf_readf_float(sndfile, ibuf, ibs);
+	if (count <= 0) break;
+	
+	for (int c = 0; c < channels; ++c) {
+
+	    for (int i = 0; i < count; ++i) {
+		prebuf[c][i] = ibuf[i * channels + c];
+	    }
+            for (int i = count; i < ibs; ++i) {
+                prebuf[c][i] = 0.0;
+            }
+
+	    decimators[c]->process(prebuf[c], postbuf[c]);
+	    
+            for (int i = 0; i < obs; ++i) {
+                obuf[i * channels + c] = postbuf[c][i];
+            }
+	}
+
+        int ocount = obs;
+        if (count < ibs) {
+            ocount = count / factor;
+        }
+
+        sf_writef_float(sndfileOut, obuf, ocount);
+
+	n += ocount;
+    }
+
+    sf_close(sndfile);
+    sf_close(sndfileOut);
+
+    for (int c = 0; c < channels; ++c) {
+	delete[] prebuf[c];
+	delete[] postbuf[c];
+	delete decimators[c];
+    }
+
+    delete[] prebuf;
+    delete[] postbuf;
+    delete[] ibuf;
+    delete[] obuf;
+
+    timeval etv;
+    (void)gettimeofday(&etv, 0);
+        
+    etv.tv_sec -= tv.tv_sec;
+    if (etv.tv_usec < tv.tv_usec) {
+	etv.tv_usec += 1000000;
+            etv.tv_sec -= 1;
+    }
+    etv.tv_usec -= tv.tv_usec;
+        
+    double sec = double(etv.tv_sec) + (double(etv.tv_usec) / 1000000.0);
+    cerr << "elapsed time: " << sec << " sec, in frames/sec: " << sfinfo.frames/sec << ", out frames/sec: " << n/sec << endl;
+
+    return 0;
+}
+
+
+
+    
+	
+