diff vamp-sdk/hostext/PluginInputDomainAdapter.cpp @ 58:0284955e31e5 host-factory-stuff

* reshuffle

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vamp-sdk/hostext/PluginInputDomainAdapter.cpp	Thu May 24 10:05:00 2007 +0000
@@ -0,0 +1,274 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Vamp
+
+    An API for audio analysis and feature extraction plugins.
+
+    Centre for Digital Music, Queen Mary, University of London.
+    Copyright 2006 Chris Cannam.
+  
+    Permission is hereby granted, free of charge, to any person
+    obtaining a copy of this software and associated documentation
+    files (the "Software"), to deal in the Software without
+    restriction, including without limitation the rights to use, copy,
+    modify, merge, publish, distribute, sublicense, and/or sell copies
+    of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be
+    included in all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
+    ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+    CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+    WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+    Except as contained in this notice, the names of the Centre for
+    Digital Music; Queen Mary, University of London; and Chris Cannam
+    shall not be used in advertising or otherwise to promote the sale,
+    use or other dealings in this Software without prior written
+    authorization.
+*/
+
+#include "PluginInputDomainAdapter.h"
+
+#include <cmath>
+
+namespace Vamp {
+
+PluginInputDomainAdapter::PluginInputDomainAdapter(Plugin *plugin) :
+    PluginWrapper(plugin),
+    m_channels(0),
+    m_blockSize(0),
+    m_freqbuf(0)
+{
+}
+
+PluginInputDomainAdapter::~PluginInputDomainAdapter()
+{
+}
+    
+bool
+PluginInputDomainAdapter::initialise(size_t channels, size_t stepSize, size_t blockSize)
+{
+    //!!! complain and die if blocksize is not a power of 2
+
+    if (m_plugin->getInputDomain() == FrequencyDomain) {
+        if (m_channels > 0) {
+            for (size_t c = 0; c < m_channels; ++c) {
+                delete[] m_freqbuf[c];
+            }
+            delete[] m_freqbuf;
+            delete[] m_ri;
+            delete[] m_ro;
+            delete[] m_io;
+        }
+    }
+
+    m_channels = channels;
+    m_blockSize = blockSize;
+
+    if (m_plugin->getInputDomain() == FrequencyDomain) {
+        m_freqbuf = new float *[m_channels];
+        for (size_t c = 0; c < m_channels; ++c) {
+            m_freqbuf[c] = new float[m_blockSize + 2];
+        }
+        m_ri = new double[m_blockSize];
+        m_ro = new double[m_blockSize];
+        m_io = new double[m_blockSize];
+    }
+
+    return m_plugin->initialise(channels, stepSize, blockSize);
+}
+
+Plugin::InputDomain
+PluginInputDomainAdapter::getInputDomain() const
+{
+    return TimeDomain;
+}
+
+size_t
+PluginInputDomainAdapter::getPreferredStepSize() const
+{
+    size_t step = m_plugin->getPreferredStepSize();
+
+    if (step == 0 && (m_plugin->getInputDomain() == FrequencyDomain)) {
+        step = getPreferredBlockSize() / 2;
+    }
+
+    return step;
+}
+
+size_t
+PluginInputDomainAdapter::getPreferredBlockSize() const
+{
+    size_t block = m_plugin->getPreferredBlockSize();
+
+    if (block == 0 && (m_plugin->getInputDomain() == FrequencyDomain)) {
+        block = 1024;
+    }
+
+    return block;
+}
+
+Plugin::FeatureSet
+PluginInputDomainAdapter::process(const float *const *inputBuffers, RealTime timestamp)
+{
+    if (m_plugin->getInputDomain() == TimeDomain) {
+        return m_plugin->process(inputBuffers, timestamp);
+    }
+
+    for (size_t c = 0; c < m_channels; ++c) {
+
+        for (size_t i = 0; i < m_blockSize; ++i) {
+            // Hanning window
+            m_ri[i] = double(inputBuffers[c][i])
+                * (0.50 - 0.50 * cos((2 * M_PI * i)
+                                     / m_blockSize));
+        }
+
+        for (size_t i = 0; i < m_blockSize/2; ++i) {
+            // FFT shift
+            double value = m_ri[i];
+            m_ri[i] = m_ri[i + m_blockSize/2];
+            m_ri[i + m_blockSize/2] = value;
+        }
+
+        fft(m_blockSize, false, m_ri, 0, m_ro, m_io);
+
+        for (size_t i = 0; i < m_blockSize/2; ++i) {
+            m_freqbuf[c][i * 2] = m_ro[i];
+            m_freqbuf[c][i * 2 + 1] = m_io[i];
+        }
+    }
+
+    //!!! do we want to adjust the timestamp or anything so as to
+    // effectively centre the frame?
+
+    return m_plugin->process(m_freqbuf, timestamp);
+}
+
+void
+PluginInputDomainAdapter::fft(unsigned int n, bool inverse,
+                              double *ri, double *ii, double *ro, double *io)
+{
+    if (!ri || !ro || !io) return;
+
+    unsigned int bits;
+    unsigned int i, j, k, m;
+    unsigned int blockSize, blockEnd;
+
+    double tr, ti;
+
+    if (n < 2) return;
+    if (n & (n-1)) return;
+
+    double angle = 2.0 * M_PI;
+    if (inverse) angle = -angle;
+
+    for (i = 0; ; ++i) {
+	if (n & (1 << i)) {
+	    bits = i;
+	    break;
+	}
+    }
+
+    static unsigned int tableSize = 0;
+    static int *table = 0;
+
+    if (tableSize != n) {
+
+	delete[] table;
+
+	table = new int[n];
+
+	for (i = 0; i < n; ++i) {
+	
+	    m = i;
+
+	    for (j = k = 0; j < bits; ++j) {
+		k = (k << 1) | (m & 1);
+		m >>= 1;
+	    }
+
+	    table[i] = k;
+	}
+
+	tableSize = n;
+    }
+
+    if (ii) {
+	for (i = 0; i < n; ++i) {
+	    ro[table[i]] = ri[i];
+	    io[table[i]] = ii[i];
+	}
+    } else {
+	for (i = 0; i < n; ++i) {
+	    ro[table[i]] = ri[i];
+	    io[table[i]] = 0.0;
+	}
+    }
+
+    blockEnd = 1;
+
+    for (blockSize = 2; blockSize <= n; blockSize <<= 1) {
+
+	double delta = angle / (double)blockSize;
+	double sm2 = -sin(-2 * delta);
+	double sm1 = -sin(-delta);
+	double cm2 = cos(-2 * delta);
+	double cm1 = cos(-delta);
+	double w = 2 * cm1;
+	double ar[3], ai[3];
+
+	for (i = 0; i < n; i += blockSize) {
+
+	    ar[2] = cm2;
+	    ar[1] = cm1;
+
+	    ai[2] = sm2;
+	    ai[1] = sm1;
+
+	    for (j = i, m = 0; m < blockEnd; j++, m++) {
+
+		ar[0] = w * ar[1] - ar[2];
+		ar[2] = ar[1];
+		ar[1] = ar[0];
+
+		ai[0] = w * ai[1] - ai[2];
+		ai[2] = ai[1];
+		ai[1] = ai[0];
+
+		k = j + blockEnd;
+		tr = ar[0] * ro[k] - ai[0] * io[k];
+		ti = ar[0] * io[k] + ai[0] * ro[k];
+
+		ro[k] = ro[j] - tr;
+		io[k] = io[j] - ti;
+
+		ro[j] += tr;
+		io[j] += ti;
+	    }
+	}
+
+	blockEnd = blockSize;
+    }
+
+    if (inverse) {
+
+	double denom = (double)n;
+
+	for (i = 0; i < n; i++) {
+	    ro[i] /= denom;
+	    io[i] /= denom;
+	}
+    }
+}
+
+        
+}
+