1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
6 An API for audio analysis and feature extraction plugins.
8 Centre for Digital Music, Queen Mary, University of London.
9 Copyright 2006-2007 Chris Cannam and QMUL.
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37 #ifndef _VAMP_PLUGIN_INPUT_DOMAIN_ADAPTER_H_
38 #define _VAMP_PLUGIN_INPUT_DOMAIN_ADAPTER_H_
40 #include "PluginWrapper.h"
47 * \class PluginInputDomainAdapter PluginInputDomainAdapter.h <vamp-sdk/hostext/PluginInputDomainAdapter.h>
49 * PluginInputDomainAdapter is a Vamp plugin adapter that converts
50 * time-domain input into frequency-domain input for plugins that need
51 * it. This permits a host to use time- and frequency-domain plugins
52 * interchangeably without needing to handle the conversion itself.
54 * This adapter uses a basic Hanning windowed FFT that supports
55 * power-of-two block sizes only. If a frequency domain plugin
56 * requests a non-power-of-two blocksize, the adapter will adjust it
57 * to a nearby power of two instead. Thus, getPreferredBlockSize()
58 * will always return a power of two if the wrapped plugin is a
59 * frequency domain one. If the plugin doesn't accept the adjusted
60 * power of two block size, initialise() will fail.
62 * The adapter provides no way for the host to discover whether the
63 * underlying plugin is actually a time or frequency domain plugin
64 * (except that if the preferred block size is not a power of two, it
65 * must be a time domain plugin).
67 * The FFT implementation is simple and self-contained, but unlikely
68 * to be the fastest available: a host can usually do better if it
71 * In every respect other than its input domain handling, the
72 * PluginInputDomainAdapter behaves identically to the plugin that it
73 * wraps. The wrapped plugin will be deleted when the wrapper is
76 * \note This class was introduced in version 1.1 of the Vamp plugin SDK.
79 class PluginInputDomainAdapter : public PluginWrapper
82 PluginInputDomainAdapter(Plugin *plugin); // I take ownership of plugin
83 virtual ~PluginInputDomainAdapter();
85 bool initialise(size_t channels, size_t stepSize, size_t blockSize);
87 InputDomain getInputDomain() const;
89 size_t getPreferredStepSize() const;
90 size_t getPreferredBlockSize() const;
92 FeatureSet process(const float *const *inputBuffers, RealTime timestamp);