mirror of
https://github.com/cookiengineer/audacity
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389 lines
13 KiB
C
389 lines
13 KiB
C
/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
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/*
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Vamp
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An API for audio analysis and feature extraction plugins.
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Centre for Digital Music, Queen Mary, University of London.
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Copyright 2006 Chris Cannam.
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation
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files (the "Software"), to deal in the Software without
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restriction, including without limitation the rights to use, copy,
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modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
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ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
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CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the names of the Centre for
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Digital Music; Queen Mary, University of London; and Chris Cannam
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shall not be used in advertising or otherwise to promote the sale,
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use or other dealings in this Software without prior written
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authorization.
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*/
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#ifndef VAMP_HEADER_INCLUDED
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#define VAMP_HEADER_INCLUDED
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* Plugin API version. This is incremented when a change is made that
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* changes the binary layout of the descriptor records. When this
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* happens, there should be a mechanism for retaining compatibility
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* with older hosts and/or plugins.
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*
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* See also the vampApiVersion field in the plugin descriptor, and the
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* hostApiVersion argument to the vampGetPluginDescriptor function.
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*/
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#define VAMP_API_VERSION 2
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/**
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* C language API for Vamp plugins.
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*
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* This is the formal plugin API for Vamp. Plugin authors may prefer
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* to use the C++ classes provided in the Vamp plugin SDK, instead of
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* using this API directly. There is an adapter class provided that
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* makes C++ plugins available using this C API with relatively little
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* work, and the C++ headers are more thoroughly documented.
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*
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* IMPORTANT: The comments in this file summarise the purpose of each
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* of the declared fields and functions, but do not provide a complete
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* guide to their permitted values and expected usage. Please refer
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* to the C++ headers in the Vamp plugin SDK for further details and
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* plugin lifecycle documentation.
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*/
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typedef struct _VampParameterDescriptor
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{
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/** Computer-usable name of the parameter. Must not change. [a-zA-Z0-9_] */
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const char *identifier;
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/** Human-readable name of the parameter. May be translatable. */
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const char *name;
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/** Human-readable short text about the parameter. May be translatable. */
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const char *description;
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/** Human-readable unit of the parameter. */
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const char *unit;
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/** Minimum value. */
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float minValue;
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/** Maximum value. */
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float maxValue;
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/** Default value. Plugin is responsible for setting this on initialise. */
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float defaultValue;
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/** 1 if parameter values are quantized to a particular resolution. */
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int isQuantized;
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/** Quantization resolution, if isQuantized. */
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float quantizeStep;
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/** Human-readable names of the values, if isQuantized. May be NULL. */
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const char **valueNames;
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} VampParameterDescriptor;
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typedef enum
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{
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/** Each process call returns results aligned with call's block start. */
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vampOneSamplePerStep,
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/** Returned results are evenly spaced at samplerate specified below. */
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vampFixedSampleRate,
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/** Returned results have their own individual timestamps. */
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vampVariableSampleRate
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} VampSampleType;
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typedef struct _VampOutputDescriptor
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{
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/** Computer-usable name of the output. Must not change. [a-zA-Z0-9_] */
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const char *identifier;
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/** Human-readable name of the output. May be translatable. */
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const char *name;
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/** Human-readable short text about the output. May be translatable. */
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const char *description;
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/** Human-readable name of the unit of the output. */
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const char *unit;
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/** 1 if output has equal number of values for each returned result. */
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int hasFixedBinCount;
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/** Number of values per result, if hasFixedBinCount. */
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unsigned int binCount;
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/** Names of returned value bins, if hasFixedBinCount. May be NULL. */
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const char **binNames;
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/** 1 if each returned value falls within the same fixed min/max range. */
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int hasKnownExtents;
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/** Minimum value for a returned result in any bin, if hasKnownExtents. */
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float minValue;
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/** Maximum value for a returned result in any bin, if hasKnownExtents. */
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float maxValue;
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/** 1 if returned results are quantized to a particular resolution. */
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int isQuantized;
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/** Quantization resolution for returned results, if isQuantized. */
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float quantizeStep;
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/** Time positioning method for returned results (see VampSampleType). */
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VampSampleType sampleType;
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/** Sample rate of returned results, if sampleType is vampFixedSampleRate.
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"Resolution" of result, if sampleType is vampVariableSampleRate. */
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float sampleRate;
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/** 1 if the returned results for this output are known to have a
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duration field.
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This field is new in Vamp API version 2; it must not be tested
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for plugins that report an older API version in their plugin
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descriptor.
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*/
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int hasDuration;
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} VampOutputDescriptor;
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typedef struct _VampFeature
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{
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/** 1 if the feature has a timestamp (i.e. if vampVariableSampleRate). */
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int hasTimestamp;
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/** Seconds component of timestamp. */
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int sec;
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/** Nanoseconds component of timestamp. */
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int nsec;
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/** Number of values. Must be binCount if hasFixedBinCount. */
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unsigned int valueCount;
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/** Values for this returned sample. */
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float *values;
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/** Label for this returned sample. May be NULL. */
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char *label;
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} VampFeature;
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typedef struct _VampFeatureV2
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{
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/** 1 if the feature has a duration. */
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int hasDuration;
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/** Seconds component of duratiion. */
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int durationSec;
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/** Nanoseconds component of duration. */
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int durationNsec;
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} VampFeatureV2;
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typedef union _VampFeatureUnion
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{
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// sizeof(featureV1) >= sizeof(featureV2) for backward compatibility
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VampFeature v1;
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VampFeatureV2 v2;
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} VampFeatureUnion;
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typedef struct _VampFeatureList
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{
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/** Number of features in this feature list. */
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unsigned int featureCount;
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/** Features in this feature list. May be NULL if featureCount is
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zero.
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If present, this array must contain featureCount feature
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structures for a Vamp API version 1 plugin, or 2*featureCount
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feature unions for a Vamp API version 2 plugin.
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The features returned by an API version 2 plugin must consist
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of the same feature structures as in API version 1 for the
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first featureCount array elements, followed by featureCount
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unions that contain VampFeatureV2 structures (or NULL pointers
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if no V2 feature structures are present).
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*/
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VampFeatureUnion *features;
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} VampFeatureList;
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typedef enum
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{
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vampTimeDomain,
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vampFrequencyDomain
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} VampInputDomain;
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typedef void *VampPluginHandle;
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typedef struct _VampPluginDescriptor
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{
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/** API version with which this descriptor is compatible. */
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unsigned int vampApiVersion;
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/** Computer-usable name of the plugin. Must not change. [a-zA-Z0-9_] */
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const char *identifier;
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/** Human-readable name of the plugin. May be translatable. */
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const char *name;
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/** Human-readable short text about the plugin. May be translatable. */
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const char *description;
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/** Human-readable name of plugin's author or vendor. */
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const char *maker;
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/** Version number of the plugin. */
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int pluginVersion;
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/** Human-readable summary of copyright or licensing for plugin. */
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const char *copyright;
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/** Number of parameter inputs. */
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unsigned int parameterCount;
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/** Fixed descriptors for parameter inputs. */
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const VampParameterDescriptor **parameters;
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/** Number of programs. */
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unsigned int programCount;
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/** Fixed names for programs. */
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const char **programs;
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/** Preferred input domain for audio input (time or frequency). */
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VampInputDomain inputDomain;
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/** Create and return a new instance of this plugin. */
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VampPluginHandle (*instantiate)(const struct _VampPluginDescriptor *,
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float inputSampleRate);
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/** Destroy an instance of this plugin. */
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void (*cleanup)(VampPluginHandle);
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/** Initialise an instance following parameter configuration. */
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int (*initialise)(VampPluginHandle,
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unsigned int inputChannels,
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unsigned int stepSize,
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unsigned int blockSize);
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/** Reset an instance, ready to use again on new input data. */
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void (*reset)(VampPluginHandle);
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/** Get a parameter value. */
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float (*getParameter)(VampPluginHandle, int);
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/** Set a parameter value. May only be called before initialise. */
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void (*setParameter)(VampPluginHandle, int, float);
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/** Get the current program (if programCount > 0). */
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unsigned int (*getCurrentProgram)(VampPluginHandle);
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/** Set the current program. May only be called before initialise. */
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void (*selectProgram)(VampPluginHandle, unsigned int);
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/** Get the plugin's preferred processing window increment in samples. */
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unsigned int (*getPreferredStepSize)(VampPluginHandle);
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/** Get the plugin's preferred processing window size in samples. */
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unsigned int (*getPreferredBlockSize)(VampPluginHandle);
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/** Get the minimum number of input channels this plugin can handle. */
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unsigned int (*getMinChannelCount)(VampPluginHandle);
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/** Get the maximum number of input channels this plugin can handle. */
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unsigned int (*getMaxChannelCount)(VampPluginHandle);
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/** Get the number of feature outputs (distinct sets of results). */
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unsigned int (*getOutputCount)(VampPluginHandle);
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/** Get a descriptor for a given feature output. Returned pointer
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is valid only until next call to getOutputDescriptor for this
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handle, or releaseOutputDescriptor for this descriptor. Host
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must call releaseOutputDescriptor after use. */
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VampOutputDescriptor *(*getOutputDescriptor)(VampPluginHandle,
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unsigned int);
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/** Destroy a descriptor for a feature output. */
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void (*releaseOutputDescriptor)(VampOutputDescriptor *);
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/** Process an input block and return a set of features. Returned
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pointer is valid only until next call to process,
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getRemainingFeatures, or cleanup for this handle, or
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releaseFeatureSet for this feature set. Host must call
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releaseFeatureSet after use. */
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VampFeatureList *(*process)(VampPluginHandle,
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const float *const *inputBuffers,
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int sec,
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int nsec);
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/** Return any remaining features at the end of processing. */
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VampFeatureList *(*getRemainingFeatures)(VampPluginHandle);
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/** Release a feature set returned from process or getRemainingFeatures. */
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void (*releaseFeatureSet)(VampFeatureList *);
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} VampPluginDescriptor;
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/** Get the descriptor for a given plugin index in this library.
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Return NULL if the index is outside the range of valid indices for
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this plugin library.
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The hostApiVersion argument tells the library code the highest
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Vamp API version supported by the host. The function should
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return a plugin descriptor compatible with the highest API version
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supported by the library that is no higher than that supported by
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the host. Provided the descriptor has the correct vampApiVersion
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field for its actual compatibility level, the host should be able
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to do the right thing with it: use it if possible, discard it
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otherwise.
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This is the only symbol that a Vamp plugin actually needs to
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export from its shared object; all others can be hidden. See the
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accompanying documentation for notes on how to achieve this with
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certain compilers.
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*/
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const VampPluginDescriptor *vampGetPluginDescriptor
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(unsigned int hostApiVersion, unsigned int index);
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/** Function pointer type for vampGetPluginDescriptor. */
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typedef const VampPluginDescriptor *(*VampGetPluginDescriptorFunction)
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(unsigned int, unsigned int);
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#ifdef __cplusplus
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}
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#endif
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#endif
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