diff audioio/ClipMixer.cpp @ 305:9716c75499ef tonioni

Toward using a sample mixer (with arbitrary frequency target) instead of dssi player plugin

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/audioio/ClipMixer.cpp	Tue Jan 07 10:58:10 2014 +0000
@@ -0,0 +1,86 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Sonic Visualiser
+    An audio file viewer and annotation editor.
+    Centre for Digital Music, Queen Mary, University of London.
+    This file copyright 2006 Chris Cannam, 2006-2014 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.
+*/
+
+#include "ClipMixer.h"
+
+#include <sndfile.h>
+
+#include "base/Debug.h"
+
+ClipMixer::ClipMixer(int channels, int sampleRate, int blockSize) :
+    m_channels(channels),
+    m_sampleRate(sampleRate),
+    m_blockSize(blockSize),
+    m_clipData(0)
+{
+}
+
+ClipMixer::~ClipMixer()
+{
+    delete[] m_clipData;
+}
+
+bool
+ClipMixer::loadClipData(QString path, float f0)
+{
+    if (m_clipData) {
+        cerr << "ClipPlayer::loadClipData: Already have clip loaded" << endl;
+        return false;
+    }
+
+    SF_INFO info;
+    SNDFILE *file;
+    int sampleCount = 0;
+    float *tmpFrames;
+    size_t i;
+
+    info.format = 0;
+    file = sf_open(path.toLocal8Bit().data(), SFM_READ, &info);
+    if (!file) {
+	cerr << "ClipPlayer::loadClipData: Failed to open file "
+             << path << ": " << sf_strerror(file) << endl;
+	return false;
+    }
+
+    tmpFrames = (float *)malloc(info.frames * info.channels * sizeof(float));
+    if (!tmpFrames) {
+        cerr << "ClipPlayer::loadClipData: malloc(" << info.frames * info.channels * sizeof(float) << ") failed" << endl;
+        return false;
+    }
+
+    sf_readf_float(file, tmpFrames, info.frames);
+    sf_close(file);
+
+    m_clipData = (float *)malloc(info.frames * sizeof(float));
+    if (!m_clipData) {
+        cerr << "ClipPlayer::loadClipData: malloc(" << info.frames * sizeof(float) << ") failed" << endl;
+	free(tmpFrames);
+	return false;
+    }
+
+    for (i = 0; i < info.frames; ++i) {
+	int j;
+	m_clipData[i] = 0.0f;
+	for (j = 0; j < info.channels; ++j) {
+	    m_clipData[i] += tmpFrames[i * info.channels + j];
+	}
+    }
+
+    free(tmpFrames);
+
+    m_clipLength = info.frames;
+    m_clipF0 = f0;
+    m_clipRate = info.samplerate;
+}