Chris@14: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@14: 
Chris@14: /*
Chris@14:     Vamp
Chris@14: 
Chris@14:     An API for audio analysis and feature extraction plugins.
Chris@14: 
Chris@14:     Centre for Digital Music, Queen Mary, University of London.
Chris@14:     Copyright 2006 Chris Cannam.
Chris@14:   
Chris@14:     Permission is hereby granted, free of charge, to any person
Chris@14:     obtaining a copy of this software and associated documentation
Chris@14:     files (the "Software"), to deal in the Software without
Chris@14:     restriction, including without limitation the rights to use, copy,
Chris@14:     modify, merge, publish, distribute, sublicense, and/or sell copies
Chris@14:     of the Software, and to permit persons to whom the Software is
Chris@14:     furnished to do so, subject to the following conditions:
Chris@14: 
Chris@14:     The above copyright notice and this permission notice shall be
Chris@14:     included in all copies or substantial portions of the Software.
Chris@14: 
Chris@14:     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
Chris@14:     EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
Chris@14:     MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
Chris@14:     NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
Chris@14:     ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
Chris@14:     CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
Chris@14:     WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Chris@14: 
Chris@14:     Except as contained in this notice, the names of the Centre for
Chris@14:     Digital Music; Queen Mary, University of London; and Chris Cannam
Chris@14:     shall not be used in advertising or otherwise to promote the sale,
Chris@14:     use or other dealings in this Software without prior written
Chris@14:     authorization.
Chris@14: */
Chris@14: 
Chris@14: #ifndef VAMP_HEADER_INCLUDED
Chris@14: #define VAMP_HEADER_INCLUDED
Chris@14: 
Chris@14: #ifdef __cplusplus
Chris@14: extern "C" {
Chris@14: #endif
Chris@14: 
Chris@14: /** 
Chris@14:  * Plugin API version.  This is incremented when a change is made that
Chris@14:  * changes the binary layout of the descriptor records.  When this
Chris@14:  * happens, there should be a mechanism for retaining compatibility
Chris@14:  * with older hosts and/or plugins.
Chris@14:  *
Chris@14:  * See also the vampApiVersion field in the plugin descriptor, and the
Chris@14:  * hostApiVersion argument to the vampGetPluginDescriptor function.
Chris@14:  */
Chris@14: #define VAMP_API_VERSION 2
Chris@14: 
Chris@14: /**
Chris@14:  * C language API for Vamp plugins.
Chris@14:  * 
Chris@14:  * This is the formal plugin API for Vamp.  Plugin authors may prefer
Chris@14:  * to use the C++ classes provided in the Vamp plugin SDK, instead of
Chris@14:  * using this API directly.  There is an adapter class provided that
Chris@14:  * makes C++ plugins available using this C API with relatively little
Chris@14:  * work, and the C++ headers are more thoroughly documented.
Chris@14:  *
Chris@14:  * IMPORTANT: The comments in this file summarise the purpose of each
Chris@14:  * of the declared fields and functions, but do not provide a complete
Chris@14:  * guide to their permitted values and expected usage.  Please refer
Chris@14:  * to the C++ headers in the Vamp plugin SDK for further details and
Chris@14:  * plugin lifecycle documentation.
Chris@14:  */
Chris@14: 
Chris@14: typedef struct _VampParameterDescriptor
Chris@14: {
Chris@14:     /** Computer-usable name of the parameter. Must not change. [a-zA-Z0-9_] */
Chris@14:     const char *identifier;
Chris@14: 
Chris@14:     /** Human-readable name of the parameter. May be translatable. */
Chris@14:     const char *name;
Chris@14: 
Chris@14:     /** Human-readable short text about the parameter.  May be translatable. */
Chris@14:     const char *description;
Chris@14: 
Chris@14:     /** Human-readable unit of the parameter. */
Chris@14:     const char *unit;
Chris@14: 
Chris@14:     /** Minimum value. */
Chris@14:     float minValue;
Chris@14: 
Chris@14:     /** Maximum value. */
Chris@14:     float maxValue;
Chris@14: 
Chris@14:     /** Default value. Plugin is responsible for setting this on initialise. */
Chris@14:     float defaultValue;
Chris@14: 
Chris@14:     /** 1 if parameter values are quantized to a particular resolution. */
Chris@14:     int isQuantized;
Chris@14: 
Chris@14:     /** Quantization resolution, if isQuantized. */
Chris@14:     float quantizeStep;
Chris@14: 
Chris@14:     /** Human-readable names of the values, if isQuantized.  May be NULL. */
Chris@14:     const char **valueNames;
Chris@14: 
Chris@14: } VampParameterDescriptor;
Chris@14: 
Chris@14: typedef enum
Chris@14: {
Chris@14:     /** Each process call returns results aligned with call's block start. */
Chris@14:     vampOneSamplePerStep,
Chris@14: 
Chris@14:     /** Returned results are evenly spaced at samplerate specified below. */
Chris@14:     vampFixedSampleRate,
Chris@14: 
Chris@14:     /** Returned results have their own individual timestamps. */
Chris@14:     vampVariableSampleRate
Chris@14: 
Chris@14: } VampSampleType;
Chris@14: 
Chris@14: typedef struct _VampOutputDescriptor
Chris@14: {
Chris@14:     /** Computer-usable name of the output. Must not change. [a-zA-Z0-9_] */
Chris@14:     const char *identifier;
Chris@14: 
Chris@14:     /** Human-readable name of the output. May be translatable. */
Chris@14:     const char *name;
Chris@14: 
Chris@14:     /** Human-readable short text about the output. May be translatable. */
Chris@14:     const char *description;
Chris@14: 
Chris@14:     /** Human-readable name of the unit of the output. */
Chris@14:     const char *unit;
Chris@14: 
Chris@14:     /** 1 if output has equal number of values for each returned result. */
Chris@14:     int hasFixedBinCount;
Chris@14: 
Chris@14:     /** Number of values per result, if hasFixedBinCount. */
Chris@14:     unsigned int binCount;
Chris@14: 
Chris@14:     /** Names of returned value bins, if hasFixedBinCount.  May be NULL. */
Chris@14:     const char **binNames;
Chris@14: 
Chris@14:     /** 1 if each returned value falls within the same fixed min/max range. */
Chris@14:     int hasKnownExtents;
Chris@14:     
Chris@14:     /** Minimum value for a returned result in any bin, if hasKnownExtents. */
Chris@14:     float minValue;
Chris@14: 
Chris@14:     /** Maximum value for a returned result in any bin, if hasKnownExtents. */
Chris@14:     float maxValue;
Chris@14: 
Chris@14:     /** 1 if returned results are quantized to a particular resolution. */
Chris@14:     int isQuantized;
Chris@14: 
Chris@14:     /** Quantization resolution for returned results, if isQuantized. */
Chris@14:     float quantizeStep;
Chris@14: 
Chris@14:     /** Time positioning method for returned results (see VampSampleType). */
Chris@14:     VampSampleType sampleType;
Chris@14: 
Chris@14:     /** Sample rate of returned results, if sampleType is vampFixedSampleRate.
Chris@14:        "Resolution" of result, if sampleType is vampVariableSampleRate. */
Chris@14:     float sampleRate;
Chris@14: 
Chris@14:     /** 1 if the returned results for this output are known to have a
Chris@14:         duration field.
Chris@14: 
Chris@14:         This field is new in Vamp API version 2; it must not be tested
Chris@14:         for plugins that report an older API version in their plugin
Chris@14:         descriptor.
Chris@14:     */
Chris@14:     int hasDuration;
Chris@14: 
Chris@14: } VampOutputDescriptor;
Chris@14: 
Chris@14: typedef struct _VampFeature
Chris@14: {
Chris@14:     /** 1 if the feature has a timestamp (i.e. if vampVariableSampleRate). */
Chris@14:     int hasTimestamp;
Chris@14: 
Chris@14:     /** Seconds component of timestamp. */
Chris@14:     int sec;
Chris@14: 
Chris@14:     /** Nanoseconds component of timestamp. */
Chris@14:     int nsec;
Chris@14: 
Chris@14:     /** Number of values.  Must be binCount if hasFixedBinCount. */
Chris@14:     unsigned int valueCount;
Chris@14: 
Chris@14:     /** Values for this returned sample. */
Chris@14:     float *values;
Chris@14: 
Chris@14:     /** Label for this returned sample.  May be NULL. */
Chris@14:     char *label;
Chris@14: 
Chris@14: } VampFeature;
Chris@14: 
Chris@14: typedef struct _VampFeatureV2
Chris@14: {
Chris@14:     /** 1 if the feature has a duration. */
Chris@14:     int hasDuration;
Chris@14: 
Chris@14:     /** Seconds component of duratiion. */
Chris@14:     int durationSec;
Chris@14: 
Chris@14:     /** Nanoseconds component of duration. */
Chris@14:     int durationNsec;
Chris@14: 
Chris@14: } VampFeatureV2;
Chris@14: 
Chris@14: typedef union _VampFeatureUnion
Chris@14: {
Chris@14:     // sizeof(featureV1) >= sizeof(featureV2) for backward compatibility
Chris@14:     VampFeature   v1;
Chris@14:     VampFeatureV2 v2;
Chris@14: 
Chris@14: } VampFeatureUnion;
Chris@14: 
Chris@14: typedef struct _VampFeatureList
Chris@14: {
Chris@14:     /** Number of features in this feature list. */
Chris@14:     unsigned int featureCount;
Chris@14: 
Chris@14:     /** Features in this feature list.  May be NULL if featureCount is
Chris@14:         zero.
Chris@14: 
Chris@14:         If present, this array must contain featureCount feature
Chris@14:         structures for a Vamp API version 1 plugin, or 2*featureCount
Chris@14:         feature unions for a Vamp API version 2 plugin.
Chris@14: 
Chris@14:         The features returned by an API version 2 plugin must consist
Chris@14:         of the same feature structures as in API version 1 for the
Chris@14:         first featureCount array elements, followed by featureCount
Chris@14:         unions that contain VampFeatureV2 structures (or NULL pointers
Chris@14:         if no V2 feature structures are present).
Chris@14:      */
Chris@14:     VampFeatureUnion *features;
Chris@14: 
Chris@14: } VampFeatureList;
Chris@14: 
Chris@14: typedef enum
Chris@14: {
Chris@14:     vampTimeDomain,
Chris@14:     vampFrequencyDomain
Chris@14: 
Chris@14: } VampInputDomain;
Chris@14: 
Chris@14: typedef void *VampPluginHandle;
Chris@14: 
Chris@14: typedef struct _VampPluginDescriptor
Chris@14: {
Chris@14:     /** API version with which this descriptor is compatible. */
Chris@14:     unsigned int vampApiVersion;
Chris@14: 
Chris@14:     /** Computer-usable name of the plugin. Must not change. [a-zA-Z0-9_] */
Chris@14:     const char *identifier;
Chris@14: 
Chris@14:     /** Human-readable name of the plugin. May be translatable. */
Chris@14:     const char *name;
Chris@14: 
Chris@14:     /** Human-readable short text about the plugin. May be translatable. */
Chris@14:     const char *description;
Chris@14: 
Chris@14:     /** Human-readable name of plugin's author or vendor. */
Chris@14:     const char *maker;
Chris@14: 
Chris@14:     /** Version number of the plugin. */
Chris@14:     int pluginVersion;
Chris@14: 
Chris@14:     /** Human-readable summary of copyright or licensing for plugin. */
Chris@14:     const char *copyright;
Chris@14: 
Chris@14:     /** Number of parameter inputs. */
Chris@14:     unsigned int parameterCount;
Chris@14: 
Chris@14:     /** Fixed descriptors for parameter inputs. */
Chris@14:     const VampParameterDescriptor **parameters;
Chris@14: 
Chris@14:     /** Number of programs. */
Chris@14:     unsigned int programCount;
Chris@14: 
Chris@14:     /** Fixed names for programs. */
Chris@14:     const char **programs;
Chris@14: 
Chris@14:     /** Preferred input domain for audio input (time or frequency). */
Chris@14:     VampInputDomain inputDomain;
Chris@14: 
Chris@14:     /** Create and return a new instance of this plugin. */
Chris@14:     VampPluginHandle (*instantiate)(const struct _VampPluginDescriptor *,
Chris@14:                                    float inputSampleRate);
Chris@14: 
Chris@14:     /** Destroy an instance of this plugin. */
Chris@14:     void (*cleanup)(VampPluginHandle);
Chris@14: 
Chris@14:     /** Initialise an instance following parameter configuration. */
Chris@14:     int (*initialise)(VampPluginHandle,
Chris@14:                       unsigned int inputChannels,
Chris@14:                       unsigned int stepSize, 
Chris@14:                       unsigned int blockSize);
Chris@14: 
Chris@14:     /** Reset an instance, ready to use again on new input data. */
Chris@14:     void (*reset)(VampPluginHandle);
Chris@14: 
Chris@14:     /** Get a parameter value. */
Chris@14:     float (*getParameter)(VampPluginHandle, int);
Chris@14: 
Chris@14:     /** Set a parameter value. May only be called before initialise. */
Chris@14:     void  (*setParameter)(VampPluginHandle, int, float);
Chris@14: 
Chris@14:     /** Get the current program (if programCount > 0). */
Chris@14:     unsigned int (*getCurrentProgram)(VampPluginHandle);
Chris@14: 
Chris@14:     /** Set the current program. May only be called before initialise. */
Chris@14:     void  (*selectProgram)(VampPluginHandle, unsigned int);
Chris@14:     
Chris@14:     /** Get the plugin's preferred processing window increment in samples. */
Chris@14:     unsigned int (*getPreferredStepSize)(VampPluginHandle);
Chris@14: 
Chris@14:     /** Get the plugin's preferred processing window size in samples. */
Chris@14:     unsigned int (*getPreferredBlockSize)(VampPluginHandle);
Chris@14: 
Chris@14:     /** Get the minimum number of input channels this plugin can handle. */
Chris@14:     unsigned int (*getMinChannelCount)(VampPluginHandle);
Chris@14: 
Chris@14:     /** Get the maximum number of input channels this plugin can handle. */
Chris@14:     unsigned int (*getMaxChannelCount)(VampPluginHandle);
Chris@14: 
Chris@14:     /** Get the number of feature outputs (distinct sets of results). */
Chris@14:     unsigned int (*getOutputCount)(VampPluginHandle);
Chris@14: 
Chris@14:     /** Get a descriptor for a given feature output. Returned pointer
Chris@14:         is valid only until next call to getOutputDescriptor for this
Chris@14:         handle, or releaseOutputDescriptor for this descriptor. Host
Chris@14:         must call releaseOutputDescriptor after use. */
Chris@14:     VampOutputDescriptor *(*getOutputDescriptor)(VampPluginHandle,
Chris@14:                                                  unsigned int);
Chris@14: 
Chris@14:     /** Destroy a descriptor for a feature output. */
Chris@14:     void (*releaseOutputDescriptor)(VampOutputDescriptor *);
Chris@14: 
Chris@14:     /** Process an input block and return a set of features. Returned
Chris@14:         pointer is valid only until next call to process,
Chris@14:         getRemainingFeatures, or cleanup for this handle, or
Chris@14:         releaseFeatureSet for this feature set. Host must call
Chris@14:         releaseFeatureSet after use. */
Chris@14:     VampFeatureList *(*process)(VampPluginHandle,
Chris@14:                                 const float *const *inputBuffers,
Chris@14:                                 int sec,
Chris@14:                                 int nsec);
Chris@14: 
Chris@14:     /** Return any remaining features at the end of processing. */
Chris@14:     VampFeatureList *(*getRemainingFeatures)(VampPluginHandle);
Chris@14: 
Chris@14:     /** Release a feature set returned from process or getRemainingFeatures. */
Chris@14:     void (*releaseFeatureSet)(VampFeatureList *);
Chris@14: 
Chris@14: } VampPluginDescriptor;
Chris@14: 
Chris@14: 
Chris@14: /** Get the descriptor for a given plugin index in this library.
Chris@14:     Return NULL if the index is outside the range of valid indices for
Chris@14:     this plugin library.
Chris@14: 
Chris@14:     The hostApiVersion argument tells the library code the highest
Chris@14:     Vamp API version supported by the host.  The function should
Chris@14:     return a plugin descriptor compatible with the highest API version
Chris@14:     supported by the library that is no higher than that supported by
Chris@14:     the host.  Provided the descriptor has the correct vampApiVersion
Chris@14:     field for its actual compatibility level, the host should be able
Chris@14:     to do the right thing with it: use it if possible, discard it
Chris@14:     otherwise.
Chris@14: 
Chris@14:     This is the only symbol that a Vamp plugin actually needs to
Chris@14:     export from its shared object; all others can be hidden.  See the
Chris@14:     accompanying documentation for notes on how to achieve this with
Chris@14:     certain compilers.
Chris@14: */
Chris@14: const VampPluginDescriptor *vampGetPluginDescriptor
Chris@14:     (unsigned int hostApiVersion, unsigned int index);
Chris@14: 
Chris@14: 
Chris@14: /** Function pointer type for vampGetPluginDescriptor. */
Chris@14: typedef const VampPluginDescriptor *(*VampGetPluginDescriptorFunction)
Chris@14:     (unsigned int, unsigned int);
Chris@14: 
Chris@14: #ifdef __cplusplus
Chris@14: }
Chris@14: #endif
Chris@14: 
Chris@14: #endif