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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 2006-2008 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_SUMMARISING_ADAPTER_H_
+#define _VAMP_PLUGIN_SUMMARISING_ADAPTER_H_
+
+#include "hostguard.h"
+#include "PluginWrapper.h"
+
+#include <set>
+
+_VAMP_SDK_HOSTSPACE_BEGIN(PluginSummarisingAdapter.h)
+
+namespace Vamp {
+
+namespace HostExt {
+
+/**
+ * \class PluginSummarisingAdapter PluginSummarisingAdapter.h <vamp-hostsdk/PluginSummarisingAdapter.h>
+ *
+ * PluginSummarisingAdapter is a Vamp plugin adapter that provides
+ * summarisation methods such as mean and median averages of output
+ * features, for use in any context where an available plugin produces
+ * individual values but the result that is actually needed is some
+ * sort of aggregate.
+ *
+ * To make use of PluginSummarisingAdapter, the host should configure,
+ * initialise and run the plugin through the adapter interface just as
+ * normal.  Then, after the process and getRemainingFeatures methods
+ * have been properly called and processing is complete, the host may
+ * call getSummaryForOutput or getSummaryForAllOutputs to obtain
+ * summarised features: averages, maximum values, etc, depending on
+ * the SummaryType passed to the function.
+ *
+ * By default PluginSummarisingAdapter calculates a single summary of
+ * each output's feature across the whole duration of processed audio.
+ * A host needing summaries of sub-segments of the whole audio may
+ * call setSummarySegmentBoundaries before retrieving the summaries,
+ * providing a list of times such that one summary will be provided
+ * for each segment between two consecutive times.
+ *
+ * PluginSummarisingAdapter is straightforward rather than fast.  It
+ * calculates all of the summary types for all outputs always, and
+ * then returns only the ones that are requested.  It is designed on
+ * the basis that, for most features, summarising and storing
+ * summarised results is far cheaper than calculating the results in
+ * the first place.  If this is not true for your particular feature,
+ * PluginSummarisingAdapter may not be the best approach for you.
+ *
+ * \note This class was introduced in version 2.0 of the Vamp plugin SDK.
+ */
+
+class PluginSummarisingAdapter : public PluginWrapper
+{
+public:
+    /**
+     * Construct a PluginSummarisingAdapter wrapping the given plugin.
+     * The adapter takes ownership of the plugin, which will be
+     * deleted when the adapter is deleted.
+     */
+    PluginSummarisingAdapter(Plugin *plugin); 
+    virtual ~PluginSummarisingAdapter();
+
+    bool initialise(size_t channels, size_t stepSize, size_t blockSize);
+
+    void reset();
+
+    FeatureSet process(const float *const *inputBuffers, RealTime timestamp);
+    FeatureSet getRemainingFeatures();
+
+    typedef std::set<RealTime> SegmentBoundaries;
+
+    /**
+     * Specify a series of segment boundaries, such that one summary
+     * will be returned for each of the contiguous intra-boundary
+     * segments.  This function must be called before
+     * getSummaryForOutput or getSummaryForAllOutputs.
+     * 
+     * Note that you cannot retrieve results with multiple different
+     * segmentations by repeatedly calling this function followed by
+     * one of the getSummary functions.  The summaries are all
+     * calculated at the first call to any getSummary function, and
+     * once the summaries have been calculated, they remain
+     * calculated.
+     */
+    void setSummarySegmentBoundaries(const SegmentBoundaries &);
+
+    enum SummaryType {
+        Minimum            = 0,
+        Maximum            = 1,
+        Mean               = 2,
+        Median             = 3,
+        Mode               = 4,
+        Sum                = 5,
+        Variance           = 6,
+        StandardDeviation  = 7,
+        Count              = 8,
+
+        UnknownSummaryType = 999
+    };
+
+    /**
+     * AveragingMethod indicates how the adapter should handle
+     * average-based summaries of features whose results are not
+     * equally spaced in time.
+     *
+     * If SampleAverage is specified, summary types based on averages
+     * will be calculated by treating each result individually without
+     * regard to its time: for example, the mean will be the sum of
+     * all values divided by the number of values.
+     *
+     * If ContinuousTimeAverage is specified, each feature will be
+     * considered to have a duration, either as specified in the
+     * feature's duration field, or until the following feature: thus,
+     * for example, the mean will be the sum of the products of values
+     * and durations, divided by the total duration.
+     *
+     * Although SampleAverage is useful for many types of feature,
+     * ContinuousTimeAverage is essential for some situations, for
+     * example finding the result that spans the largest proportion of
+     * the input given a feature that emits a new result only when the
+     * value changes (the modal value integrated over time).
+     */
+    enum AveragingMethod {
+        SampleAverage         = 0,
+        ContinuousTimeAverage = 1,
+    };
+
+    /**
+     * Return summaries of the features that were returned on the
+     * given output, using the given SummaryType and AveragingMethod.
+     *
+     * The plugin must have been fully run (process() and
+     * getRemainingFeatures() calls all made as appropriate) before
+     * this function is called.
+     */
+    FeatureList getSummaryForOutput(int output,
+                                    SummaryType type,
+                                    AveragingMethod method = SampleAverage);
+
+    /**
+     * Return summaries of the features that were returned on all of
+     * the plugin's outputs, using the given SummaryType and
+     * AveragingMethod.
+     *
+     * The plugin must have been fully run (process() and
+     * getRemainingFeatures() calls all made as appropriate) before
+     * this function is called.
+     */
+    FeatureSet getSummaryForAllOutputs(SummaryType type,
+                                       AveragingMethod method = SampleAverage);
+
+protected:
+    class Impl;
+    Impl *m_impl;
+};
+
+}
+
+}
+
+_VAMP_SDK_HOSTSPACE_END(PluginSummarisingAdapter.h)
+
+#endif