comparison vamp-hostsdk/PluginBufferingAdapter.h @ 233:521734d2b498 distinct-libraries

* Flatten directory tree a bit, update doxygen

+/* -*- 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.
+    This file by Mark Levy and Chris Cannam, Copyright 2007-2008 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_BUFFERING_ADAPTER_H_
+#define _VAMP_PLUGIN_BUFFERING_ADAPTER_H_
+
+#include "PluginWrapper.h"
+
+namespace Vamp {
+	
+namespace HostExt {
+		
+/**
+ * \class PluginBufferingAdapter PluginBufferingAdapter.h <vamp-hostsdk/PluginBufferingAdapter.h>
+ *
+ * PluginBufferingAdapter is a Vamp plugin adapter that allows plugins
+ * to be used by a host supplying an audio stream in non-overlapping
+ * buffers of arbitrary size.
+ *
+ * A host using PluginBufferingAdapter may ignore the preferred step
+ * and block size reported by the plugin, and still expect the plugin
+ * to run.  The value of blockSize and stepSize passed to initialise
+ * should be the size of the buffer which the host will supply; the
+ * stepSize should be equal to the blockSize.
+ *
+ * If the internal step size used for the plugin differs from that
+ * supplied by the host, the adapter will modify the sample type and
+ * rate specifications for the plugin outputs appropriately, and set
+ * timestamps on the output features for outputs that formerly used a
+ * different sample rate specification.  This is necessary in order to
+ * obtain correct time stamping.
+ * 
+ * In other respects, the PluginBufferingAdapter behaves identically
+ * to the plugin that it wraps. The wrapped plugin will be deleted
+ * when the wrapper is deleted.
+ */
+		
+class PluginBufferingAdapter : public PluginWrapper
+{
+public:
+    PluginBufferingAdapter(Plugin *plugin); // I take ownership of plugin
+    virtual ~PluginBufferingAdapter();
+
+    /**
+     * Return the preferred step size for this adapter.
+     * 
+     * Because of the way this adapter works, its preferred step size
+     * will always be the same as its preferred block size.  This may
+     * or may not be the same as the preferred step size of the
+     * underlying plugin, which may be obtained by calling
+     * getPluginPreferredStepSize().
+     */
+    size_t getPreferredStepSize() const;
+
+    /**
+     * Return the preferred block size for this adapter.
+     * 
+     * This may or may not be the same as the preferred block size of
+     * the underlying plugin, which may be obtained by calling
+     * getPluginPreferredBlockSize().
+     *
+     * Note that this adapter may be initialised with any block size,
+     * not just its supposedly preferred one.
+     */
+    size_t getPreferredBlockSize() const;
+
+    /**
+     * Initialise the adapter (and therefore the plugin) for the given
+     * number of channels.  Initialise the adapter for the given step
+     * and block size, which must be equal.
+     *
+     * The step and block size used for the underlying plugin will
+     * depend on its preferences, or any values previously passed to
+     * setPluginStepSize and setPluginBlockSize.
+     */
+    bool initialise(size_t channels, size_t stepSize, size_t blockSize);
+
+    /**
+     * Return the preferred step size of the plugin wrapped by this
+     * adapter.
+     *
+     * This is included mainly for informational purposes.  This value
+     * is not likely to be a valid step size for the adapter itself,
+     * and it is not usually of any use in interpreting the results
+     * (because the adapter re-writes OneSamplePerStep outputs to
+     * FixedSampleRate so that the hop size no longer needs to be
+     * known beforehand in order to interpret them).
+     */
+    size_t getPluginPreferredStepSize() const;
+
+    /** 
+     * Return the preferred block size of the plugin wrapped by this
+     * adapter.
+     *
+     * This is included mainly for informational purposes.
+     */
+    size_t getPluginPreferredBlockSize() const;
+
+    /**
+     * Set the step size that will be used for the underlying plugin
+     * when initialise() is called.  If this is not set, the plugin's
+     * own preferred step size will be used.  You will not usually
+     * need to call this function.  If you do call it, it must be
+     * before the first call to initialise().
+     */
+    void setPluginStepSize(size_t stepSize);
+
+    /**
+     * Set the block size that will be used for the underlying plugin
+     * when initialise() is called.  If this is not set, the plugin's
+     * own preferred block size will be used.  You will not usually
+     * need to call this function.  If you do call it, it must be
+     * before the first call to initialise().
+     */
+    void setPluginBlockSize(size_t blockSize);
+
+    /**
+     * Return the step and block sizes that were actually used when
+     * initialising the underlying plugin.
+     *
+     * This is included mainly for informational purposes.  You will
+     * not usually need to call this function.  If this is called
+     * before initialise(), it will return 0 for both values.  If it
+     * is called after a failed call to initialise(), it will return
+     * the values that were used in the failed call to the plugin's
+     * initialise() function.
+     */
+    void getActualStepAndBlockSizes(size_t &stepSize, size_t &blockSize);
+
+    OutputList getOutputDescriptors() const;
+
+    void reset();
+
+    FeatureSet process(const float *const *inputBuffers, RealTime timestamp);
+    
+    FeatureSet getRemainingFeatures();
+    
+protected:
+    class Impl;
+    Impl *m_impl;
+};
+    
+}
+
+}
+
+#endif