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+/* -*- 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 2006-2007 Chris Cannam and QMUL.
+
+ 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.
+*/
+
+#ifndef _VAMP_PLUGIN_INPUT_DOMAIN_ADAPTER_H_
+#define _VAMP_PLUGIN_INPUT_DOMAIN_ADAPTER_H_
+
+#include "hostguard.h"
+#include "PluginWrapper.h"
+
+_VAMP_SDK_HOSTSPACE_BEGIN(PluginInputDomainAdapter.h)
+
+namespace Vamp {
+
+namespace HostExt {
+
+/**
+ * \class PluginInputDomainAdapter PluginInputDomainAdapter.h <vamp-hostsdk/PluginInputDomainAdapter.h>
+ *
+ * PluginInputDomainAdapter is a Vamp plugin adapter that converts
+ * time-domain input into frequency-domain input for plugins that need
+ * it. This permits a host to use time- and frequency-domain plugins
+ * interchangeably without needing to handle the conversion itself.
+ *
+ * This adapter uses a basic Hanning windowed FFT that supports
+ * power-of-two block sizes only. If a frequency domain plugin
+ * requests a non-power-of-two blocksize, the adapter will adjust it
+ * to a nearby power of two instead. Thus, getPreferredBlockSize()
+ * will always return a power of two if the wrapped plugin is a
+ * frequency domain one. If the plugin doesn't accept the adjusted
+ * power of two block size, initialise() will fail.
+ *
+ * The adapter provides no way for the host to discover whether the
+ * underlying plugin is actually a time or frequency domain plugin
+ * (except that if the preferred block size is not a power of two, it
+ * must be a time domain plugin).
+ *
+ * The FFT implementation is simple and self-contained, but unlikely
+ * to be the fastest available: a host can usually do better if it
+ * cares enough.
+ *
+ * In every respect other than its input domain handling, the
+ * PluginInputDomainAdapter behaves identically to the plugin that it
+ * wraps. The wrapped plugin will be deleted when the wrapper is
+ * deleted.
+ *
+ * \note This class was introduced in version 1.1 of the Vamp plugin SDK.
+ */
+
+class PluginInputDomainAdapter : public PluginWrapper
+{
+public:
+ /**
+ * Construct a PluginInputDomainAdapter wrapping the given plugin.
+ * The adapter takes ownership of the plugin, which will be
+ * deleted when the adapter is deleted.
+ */
+ PluginInputDomainAdapter(Plugin *plugin);
+ virtual ~PluginInputDomainAdapter();
+
+ bool initialise(size_t channels, size_t stepSize, size_t blockSize);
+
+ InputDomain getInputDomain() const;
+
+ size_t getPreferredStepSize() const;
+ size_t getPreferredBlockSize() const;
+
+ FeatureSet process(const float *const *inputBuffers, RealTime timestamp);
+
+ /**
+ * Return the amount by which the timestamps supplied to process()
+ * are being incremented when they are passed to the plugin's own
+ * process() implementation.
+ *
+ * The Vamp API mandates that the timestamp passed to the plugin
+ * for time-domain input should be the time of the first sample in
+ * the block, but the timestamp passed for frequency-domain input
+ * should be the timestamp of the centre of the block.
+ *
+ * The PluginInputDomainAdapter adjusts its timestamps properly so
+ * that the plugin receives correct times, but in some
+ * circumstances (such as for establishing the correct timing of
+ * implicitly-timed features, i.e. features without their own
+ * timestamps) the host may need to be aware that this adjustment
+ * is taking place.
+ *
+ * If the plugin requires time-domain input, this function will
+ * return zero. The result of calling this function before
+ * initialise() has been called is undefined.
+ */
+ RealTime getTimestampAdjustment() const;
+
+protected:
+ class Impl;
+ Impl *m_impl;
+};
+
+}
+
+}
+
+_VAMP_SDK_HOSTSPACE_END(PluginInputDomainAdapter.h)
+
+#endif