diff options
Diffstat (limited to 'include/lv2/core')
| -rw-r--r-- | include/lv2/core/attributes.h | 59 | ||||
| -rw-r--r-- | include/lv2/core/lv2.h | 485 | ||||
| -rw-r--r-- | include/lv2/core/lv2_util.h | 103 |
3 files changed, 647 insertions, 0 deletions
diff --git a/include/lv2/core/attributes.h b/include/lv2/core/attributes.h new file mode 100644 index 0000000..81791a2 --- /dev/null +++ b/include/lv2/core/attributes.h @@ -0,0 +1,59 @@ +/* + Copyright 2018 David Robillard <d@drobilla.net> + + Permission to use, copy, modify, and/or distribute this software for any + purpose with or without fee is hereby granted, provided that the above + copyright notice and this permission notice appear in all copies. + + THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. +*/ + +#ifndef LV2_CORE_ATTRIBUTES_H +#define LV2_CORE_ATTRIBUTES_H + +/** + @defgroup attributes Attributes + @ingroup lv2 + + Macros for source code attributes. + + @{ +*/ + +#if defined(__GNUC__) && __GNUC__ > 3 +# define LV2_DEPRECATED __attribute__((__deprecated__)) +#else +# define LV2_DEPRECATED +#endif + +#if defined(__clang__) +# define LV2_DISABLE_DEPRECATION_WARNINGS \ + _Pragma("clang diagnostic push") \ + _Pragma("clang diagnostic ignored \"-Wdeprecated-declarations\"") +#elif defined(__GNUC__) && __GNUC__ > 4 +# define LV2_DISABLE_DEPRECATION_WARNINGS \ + _Pragma("GCC diagnostic push") \ + _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"") +#else +# define LV2_DISABLE_DEPRECATION_WARNINGS +#endif + +#if defined(__clang__) +# define LV2_RESTORE_WARNINGS _Pragma("clang diagnostic pop") +#elif defined(__GNUC__) && __GNUC__ > 4 +# define LV2_RESTORE_WARNINGS _Pragma("GCC diagnostic pop") +#else +# define LV2_RESTORE_WARNINGS +#endif + +/** + @} +*/ + +#endif /* LV2_CORE_ATTRIBUTES_H */ diff --git a/include/lv2/core/lv2.h b/include/lv2/core/lv2.h new file mode 100644 index 0000000..84c40a5 --- /dev/null +++ b/include/lv2/core/lv2.h @@ -0,0 +1,485 @@ +/* + LV2 - An audio plugin interface specification. + Copyright 2006-2012 Steve Harris, David Robillard. + + Based on LADSPA, Copyright 2000-2002 Richard W.E. Furse, + Paul Barton-Davis, Stefan Westerfeld. + + Permission to use, copy, modify, and/or distribute this software for any + purpose with or without fee is hereby granted, provided that the above + copyright notice and this permission notice appear in all copies. + + THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. +*/ + +#ifndef LV2_H_INCLUDED +#define LV2_H_INCLUDED + +/** + @defgroup lv2 LV2 + + The LV2 specification. + + @{ +*/ + +/** + @defgroup lv2core LV2 Core + + Core LV2 specification. + + See <http://lv2plug.in/ns/lv2core> for details. + + @{ +*/ + +#include <stdint.h> + +// clang-format off + +#define LV2_CORE_URI "http://lv2plug.in/ns/lv2core" ///< http://lv2plug.in/ns/lv2core +#define LV2_CORE_PREFIX LV2_CORE_URI "#" ///< http://lv2plug.in/ns/lv2core# + +#define LV2_CORE__AllpassPlugin LV2_CORE_PREFIX "AllpassPlugin" ///< http://lv2plug.in/ns/lv2core#AllpassPlugin +#define LV2_CORE__AmplifierPlugin LV2_CORE_PREFIX "AmplifierPlugin" ///< http://lv2plug.in/ns/lv2core#AmplifierPlugin +#define LV2_CORE__AnalyserPlugin LV2_CORE_PREFIX "AnalyserPlugin" ///< http://lv2plug.in/ns/lv2core#AnalyserPlugin +#define LV2_CORE__AudioPort LV2_CORE_PREFIX "AudioPort" ///< http://lv2plug.in/ns/lv2core#AudioPort +#define LV2_CORE__BandpassPlugin LV2_CORE_PREFIX "BandpassPlugin" ///< http://lv2plug.in/ns/lv2core#BandpassPlugin +#define LV2_CORE__CVPort LV2_CORE_PREFIX "CVPort" ///< http://lv2plug.in/ns/lv2core#CVPort +#define LV2_CORE__ChorusPlugin LV2_CORE_PREFIX "ChorusPlugin" ///< http://lv2plug.in/ns/lv2core#ChorusPlugin +#define LV2_CORE__CombPlugin LV2_CORE_PREFIX "CombPlugin" ///< http://lv2plug.in/ns/lv2core#CombPlugin +#define LV2_CORE__CompressorPlugin LV2_CORE_PREFIX "CompressorPlugin" ///< http://lv2plug.in/ns/lv2core#CompressorPlugin +#define LV2_CORE__ConstantPlugin LV2_CORE_PREFIX "ConstantPlugin" ///< http://lv2plug.in/ns/lv2core#ConstantPlugin +#define LV2_CORE__ControlPort LV2_CORE_PREFIX "ControlPort" ///< http://lv2plug.in/ns/lv2core#ControlPort +#define LV2_CORE__ConverterPlugin LV2_CORE_PREFIX "ConverterPlugin" ///< http://lv2plug.in/ns/lv2core#ConverterPlugin +#define LV2_CORE__DelayPlugin LV2_CORE_PREFIX "DelayPlugin" ///< http://lv2plug.in/ns/lv2core#DelayPlugin +#define LV2_CORE__DistortionPlugin LV2_CORE_PREFIX "DistortionPlugin" ///< http://lv2plug.in/ns/lv2core#DistortionPlugin +#define LV2_CORE__DynamicsPlugin LV2_CORE_PREFIX "DynamicsPlugin" ///< http://lv2plug.in/ns/lv2core#DynamicsPlugin +#define LV2_CORE__EQPlugin LV2_CORE_PREFIX "EQPlugin" ///< http://lv2plug.in/ns/lv2core#EQPlugin +#define LV2_CORE__EnvelopePlugin LV2_CORE_PREFIX "EnvelopePlugin" ///< http://lv2plug.in/ns/lv2core#EnvelopePlugin +#define LV2_CORE__ExpanderPlugin LV2_CORE_PREFIX "ExpanderPlugin" ///< http://lv2plug.in/ns/lv2core#ExpanderPlugin +#define LV2_CORE__ExtensionData LV2_CORE_PREFIX "ExtensionData" ///< http://lv2plug.in/ns/lv2core#ExtensionData +#define LV2_CORE__Feature LV2_CORE_PREFIX "Feature" ///< http://lv2plug.in/ns/lv2core#Feature +#define LV2_CORE__FilterPlugin LV2_CORE_PREFIX "FilterPlugin" ///< http://lv2plug.in/ns/lv2core#FilterPlugin +#define LV2_CORE__FlangerPlugin LV2_CORE_PREFIX "FlangerPlugin" ///< http://lv2plug.in/ns/lv2core#FlangerPlugin +#define LV2_CORE__FunctionPlugin LV2_CORE_PREFIX "FunctionPlugin" ///< http://lv2plug.in/ns/lv2core#FunctionPlugin +#define LV2_CORE__GatePlugin LV2_CORE_PREFIX "GatePlugin" ///< http://lv2plug.in/ns/lv2core#GatePlugin +#define LV2_CORE__GeneratorPlugin LV2_CORE_PREFIX "GeneratorPlugin" ///< http://lv2plug.in/ns/lv2core#GeneratorPlugin +#define LV2_CORE__HighpassPlugin LV2_CORE_PREFIX "HighpassPlugin" ///< http://lv2plug.in/ns/lv2core#HighpassPlugin +#define LV2_CORE__InputPort LV2_CORE_PREFIX "InputPort" ///< http://lv2plug.in/ns/lv2core#InputPort +#define LV2_CORE__InstrumentPlugin LV2_CORE_PREFIX "InstrumentPlugin" ///< http://lv2plug.in/ns/lv2core#InstrumentPlugin +#define LV2_CORE__LimiterPlugin LV2_CORE_PREFIX "LimiterPlugin" ///< http://lv2plug.in/ns/lv2core#LimiterPlugin +#define LV2_CORE__LowpassPlugin LV2_CORE_PREFIX "LowpassPlugin" ///< http://lv2plug.in/ns/lv2core#LowpassPlugin +#define LV2_CORE__MixerPlugin LV2_CORE_PREFIX "MixerPlugin" ///< http://lv2plug.in/ns/lv2core#MixerPlugin +#define LV2_CORE__ModulatorPlugin LV2_CORE_PREFIX "ModulatorPlugin" ///< http://lv2plug.in/ns/lv2core#ModulatorPlugin +#define LV2_CORE__MultiEQPlugin LV2_CORE_PREFIX "MultiEQPlugin" ///< http://lv2plug.in/ns/lv2core#MultiEQPlugin +#define LV2_CORE__OscillatorPlugin LV2_CORE_PREFIX "OscillatorPlugin" ///< http://lv2plug.in/ns/lv2core#OscillatorPlugin +#define LV2_CORE__OutputPort LV2_CORE_PREFIX "OutputPort" ///< http://lv2plug.in/ns/lv2core#OutputPort +#define LV2_CORE__ParaEQPlugin LV2_CORE_PREFIX "ParaEQPlugin" ///< http://lv2plug.in/ns/lv2core#ParaEQPlugin +#define LV2_CORE__PhaserPlugin LV2_CORE_PREFIX "PhaserPlugin" ///< http://lv2plug.in/ns/lv2core#PhaserPlugin +#define LV2_CORE__PitchPlugin LV2_CORE_PREFIX "PitchPlugin" ///< http://lv2plug.in/ns/lv2core#PitchPlugin +#define LV2_CORE__Plugin LV2_CORE_PREFIX "Plugin" ///< http://lv2plug.in/ns/lv2core#Plugin +#define LV2_CORE__PluginBase LV2_CORE_PREFIX "PluginBase" ///< http://lv2plug.in/ns/lv2core#PluginBase +#define LV2_CORE__Point LV2_CORE_PREFIX "Point" ///< http://lv2plug.in/ns/lv2core#Point +#define LV2_CORE__Port LV2_CORE_PREFIX "Port" ///< http://lv2plug.in/ns/lv2core#Port +#define LV2_CORE__PortProperty LV2_CORE_PREFIX "PortProperty" ///< http://lv2plug.in/ns/lv2core#PortProperty +#define LV2_CORE__Resource LV2_CORE_PREFIX "Resource" ///< http://lv2plug.in/ns/lv2core#Resource +#define LV2_CORE__ReverbPlugin LV2_CORE_PREFIX "ReverbPlugin" ///< http://lv2plug.in/ns/lv2core#ReverbPlugin +#define LV2_CORE__ScalePoint LV2_CORE_PREFIX "ScalePoint" ///< http://lv2plug.in/ns/lv2core#ScalePoint +#define LV2_CORE__SimulatorPlugin LV2_CORE_PREFIX "SimulatorPlugin" ///< http://lv2plug.in/ns/lv2core#SimulatorPlugin +#define LV2_CORE__SpatialPlugin LV2_CORE_PREFIX "SpatialPlugin" ///< http://lv2plug.in/ns/lv2core#SpatialPlugin +#define LV2_CORE__Specification LV2_CORE_PREFIX "Specification" ///< http://lv2plug.in/ns/lv2core#Specification +#define LV2_CORE__SpectralPlugin LV2_CORE_PREFIX "SpectralPlugin" ///< http://lv2plug.in/ns/lv2core#SpectralPlugin +#define LV2_CORE__UtilityPlugin LV2_CORE_PREFIX "UtilityPlugin" ///< http://lv2plug.in/ns/lv2core#UtilityPlugin +#define LV2_CORE__WaveshaperPlugin LV2_CORE_PREFIX "WaveshaperPlugin" ///< http://lv2plug.in/ns/lv2core#WaveshaperPlugin +#define LV2_CORE__appliesTo LV2_CORE_PREFIX "appliesTo" ///< http://lv2plug.in/ns/lv2core#appliesTo +#define LV2_CORE__binary LV2_CORE_PREFIX "binary" ///< http://lv2plug.in/ns/lv2core#binary +#define LV2_CORE__connectionOptional LV2_CORE_PREFIX "connectionOptional" ///< http://lv2plug.in/ns/lv2core#connectionOptional +#define LV2_CORE__control LV2_CORE_PREFIX "control" ///< http://lv2plug.in/ns/lv2core#control +#define LV2_CORE__default LV2_CORE_PREFIX "default" ///< http://lv2plug.in/ns/lv2core#default +#define LV2_CORE__designation LV2_CORE_PREFIX "designation" ///< http://lv2plug.in/ns/lv2core#designation +#define LV2_CORE__documentation LV2_CORE_PREFIX "documentation" ///< http://lv2plug.in/ns/lv2core#documentation +#define LV2_CORE__enabled LV2_CORE_PREFIX "enabled" ///< http://lv2plug.in/ns/lv2core#enabled +#define LV2_CORE__enumeration LV2_CORE_PREFIX "enumeration" ///< http://lv2plug.in/ns/lv2core#enumeration +#define LV2_CORE__extensionData LV2_CORE_PREFIX "extensionData" ///< http://lv2plug.in/ns/lv2core#extensionData +#define LV2_CORE__freeWheeling LV2_CORE_PREFIX "freeWheeling" ///< http://lv2plug.in/ns/lv2core#freeWheeling +#define LV2_CORE__hardRTCapable LV2_CORE_PREFIX "hardRTCapable" ///< http://lv2plug.in/ns/lv2core#hardRTCapable +#define LV2_CORE__inPlaceBroken LV2_CORE_PREFIX "inPlaceBroken" ///< http://lv2plug.in/ns/lv2core#inPlaceBroken +#define LV2_CORE__index LV2_CORE_PREFIX "index" ///< http://lv2plug.in/ns/lv2core#index +#define LV2_CORE__integer LV2_CORE_PREFIX "integer" ///< http://lv2plug.in/ns/lv2core#integer +#define LV2_CORE__isLive LV2_CORE_PREFIX "isLive" ///< http://lv2plug.in/ns/lv2core#isLive +#define LV2_CORE__latency LV2_CORE_PREFIX "latency" ///< http://lv2plug.in/ns/lv2core#latency +#define LV2_CORE__maximum LV2_CORE_PREFIX "maximum" ///< http://lv2plug.in/ns/lv2core#maximum +#define LV2_CORE__microVersion LV2_CORE_PREFIX "microVersion" ///< http://lv2plug.in/ns/lv2core#microVersion +#define LV2_CORE__minimum LV2_CORE_PREFIX "minimum" ///< http://lv2plug.in/ns/lv2core#minimum +#define LV2_CORE__minorVersion LV2_CORE_PREFIX "minorVersion" ///< http://lv2plug.in/ns/lv2core#minorVersion +#define LV2_CORE__name LV2_CORE_PREFIX "name" ///< http://lv2plug.in/ns/lv2core#name +#define LV2_CORE__optionalFeature LV2_CORE_PREFIX "optionalFeature" ///< http://lv2plug.in/ns/lv2core#optionalFeature +#define LV2_CORE__port LV2_CORE_PREFIX "port" ///< http://lv2plug.in/ns/lv2core#port +#define LV2_CORE__portProperty LV2_CORE_PREFIX "portProperty" ///< http://lv2plug.in/ns/lv2core#portProperty +#define LV2_CORE__project LV2_CORE_PREFIX "project" ///< http://lv2plug.in/ns/lv2core#project +#define LV2_CORE__prototype LV2_CORE_PREFIX "prototype" ///< http://lv2plug.in/ns/lv2core#prototype +#define LV2_CORE__reportsLatency LV2_CORE_PREFIX "reportsLatency" ///< http://lv2plug.in/ns/lv2core#reportsLatency +#define LV2_CORE__requiredFeature LV2_CORE_PREFIX "requiredFeature" ///< http://lv2plug.in/ns/lv2core#requiredFeature +#define LV2_CORE__sampleRate LV2_CORE_PREFIX "sampleRate" ///< http://lv2plug.in/ns/lv2core#sampleRate +#define LV2_CORE__scalePoint LV2_CORE_PREFIX "scalePoint" ///< http://lv2plug.in/ns/lv2core#scalePoint +#define LV2_CORE__symbol LV2_CORE_PREFIX "symbol" ///< http://lv2plug.in/ns/lv2core#symbol +#define LV2_CORE__toggled LV2_CORE_PREFIX "toggled" ///< http://lv2plug.in/ns/lv2core#toggled + +// clang-format on + +#ifdef __cplusplus +extern "C" { +#endif + +/** + Plugin Instance Handle. + + This is a handle for one particular instance of a plugin. It is valid to + compare to NULL (or 0 for C++) but otherwise the host MUST NOT attempt to + interpret it. +*/ +typedef void* LV2_Handle; + +/** + Feature. + + Features allow hosts to make additional functionality available to plugins + without requiring modification to the LV2 API. Extensions may define new + features and specify the `URI` and `data` to be used if necessary. + Some features, such as lv2:isLive, do not require the host to pass data. +*/ +typedef struct { + /** + A globally unique, case-sensitive identifier (URI) for this feature. + + This MUST be a valid URI string as defined by RFC 3986. + */ + const char* URI; + + /** + Pointer to arbitrary data. + + The format of this data is defined by the extension which describes the + feature with the given `URI`. + */ + void* data; +} LV2_Feature; + +/** + Plugin Descriptor. + + This structure provides the core functions necessary to instantiate and use + a plugin. +*/ +typedef struct LV2_Descriptor { + /** + A globally unique, case-sensitive identifier for this plugin. + + This MUST be a valid URI string as defined by RFC 3986. All plugins with + the same URI MUST be compatible to some degree, see + http://lv2plug.in/ns/lv2core for details. + */ + const char* URI; + + /** + Instantiate the plugin. + + Note that instance initialisation should generally occur in activate() + rather than here. If a host calls instantiate(), it MUST call cleanup() + at some point in the future. + + @param descriptor Descriptor of the plugin to instantiate. + + @param sample_rate Sample rate, in Hz, for the new plugin instance. + + @param bundle_path Path to the LV2 bundle which contains this plugin + binary. It MUST include the trailing directory separator so that simply + appending a filename will yield the path to that file in the bundle. + + @param features A NULL terminated array of LV2_Feature structs which + represent the features the host supports. Plugins may refuse to + instantiate if required features are not found here. However, hosts MUST + NOT use this as a discovery mechanism: instead, use the RDF data to + determine which features are required and do not attempt to instantiate + unsupported plugins at all. This parameter MUST NOT be NULL, i.e. a host + that supports no features MUST pass a single element array containing + NULL. + + @return A handle for the new plugin instance, or NULL if instantiation + has failed. + */ + LV2_Handle (*instantiate)(const struct LV2_Descriptor* descriptor, + double sample_rate, + const char* bundle_path, + const LV2_Feature* const* features); + + /** + Connect a port on a plugin instance to a memory location. + + Plugin writers should be aware that the host may elect to use the same + buffer for more than one port and even use the same buffer for both + input and output (see lv2:inPlaceBroken in lv2.ttl). + + If the plugin has the feature lv2:hardRTCapable then there are various + things that the plugin MUST NOT do within the connect_port() function; + see lv2core.ttl for details. + + connect_port() MUST be called at least once for each port before run() + is called, unless that port is lv2:connectionOptional. The plugin must + pay careful attention to the block size passed to run() since the block + allocated may only just be large enough to contain the data, and is not + guaranteed to remain constant between run() calls. + + connect_port() may be called more than once for a plugin instance to + allow the host to change the buffers that the plugin is reading or + writing. These calls may be made before or after activate() or + deactivate() calls. + + @param instance Plugin instance containing the port. + + @param port Index of the port to connect. The host MUST NOT try to + connect a port index that is not defined in the plugin's RDF data. If + it does, the plugin's behaviour is undefined (a crash is likely). + + @param data_location Pointer to data of the type defined by the port + type in the plugin's RDF data (for example, an array of float for an + lv2:AudioPort). This pointer must be stored by the plugin instance and + used to read/write data when run() is called. Data present at the time + of the connect_port() call MUST NOT be considered meaningful. + */ + void (*connect_port)(LV2_Handle instance, uint32_t port, void* data_location); + + /** + Initialise a plugin instance and activate it for use. + + This is separated from instantiate() to aid real-time support and so + that hosts can reinitialise a plugin instance by calling deactivate() + and then activate(). In this case the plugin instance MUST reset all + state information dependent on the history of the plugin instance except + for any data locations provided by connect_port(). If there is nothing + for activate() to do then this field may be NULL. + + When present, hosts MUST call this function once before run() is called + for the first time. This call SHOULD be made as close to the run() call + as possible and indicates to real-time plugins that they are now live, + however plugins MUST NOT rely on a prompt call to run() after + activate(). + + The host MUST NOT call activate() again until deactivate() has been + called first. If a host calls activate(), it MUST call deactivate() at + some point in the future. Note that connect_port() may be called before + or after activate(). + */ + void (*activate)(LV2_Handle instance); + + /** + Run a plugin instance for a block. + + Note that if an activate() function exists then it must be called before + run(). If deactivate() is called for a plugin instance then run() may + not be called until activate() has been called again. + + If the plugin has the feature lv2:hardRTCapable then there are various + things that the plugin MUST NOT do within the run() function (see + lv2core.ttl for details). + + As a special case, when `sample_count` is 0, the plugin should update + any output ports that represent a single instant in time (for example, + control ports, but not audio ports). This is particularly useful for + latent plugins, which should update their latency output port so hosts + can pre-roll plugins to compute latency. Plugins MUST NOT crash when + `sample_count` is 0. + + @param instance Instance to be run. + + @param sample_count The block size (in samples) for which the plugin + instance must run. + */ + void (*run)(LV2_Handle instance, uint32_t sample_count); + + /** + Deactivate a plugin instance (counterpart to activate()). + + Hosts MUST deactivate all activated instances after they have been run() + for the last time. This call SHOULD be made as close to the last run() + call as possible and indicates to real-time plugins that they are no + longer live, however plugins MUST NOT rely on prompt deactivation. If + there is nothing for deactivate() to do then this field may be NULL + + Deactivation is not similar to pausing since the plugin instance will be + reinitialised by activate(). However, deactivate() itself MUST NOT fully + reset plugin state. For example, the host may deactivate a plugin, then + store its state (using some extension to do so). + + Hosts MUST NOT call deactivate() unless activate() was previously + called. Note that connect_port() may be called before or after + deactivate(). + */ + void (*deactivate)(LV2_Handle instance); + + /** + Clean up a plugin instance (counterpart to instantiate()). + + Once an instance of a plugin has been finished with it must be deleted + using this function. The instance handle passed ceases to be valid after + this call. + + If activate() was called for a plugin instance then a corresponding call + to deactivate() MUST be made before cleanup() is called. Hosts MUST NOT + call cleanup() unless instantiate() was previously called. + */ + void (*cleanup)(LV2_Handle instance); + + /** + Return additional plugin data defined by some extension. + + A typical use of this facility is to return a struct containing function + pointers to extend the LV2_Descriptor API. + + The actual type and meaning of the returned object MUST be specified + precisely by the extension. This function MUST return NULL for any + unsupported URI. If a plugin does not support any extension data, this + field may be NULL. + + The host is never responsible for freeing the returned value. + */ + const void* (*extension_data)(const char* uri); +} LV2_Descriptor; + +/** + Helper macro needed for LV2_SYMBOL_EXPORT when using C++. +*/ +#ifdef __cplusplus +# define LV2_SYMBOL_EXTERN extern "C" +#else +# define LV2_SYMBOL_EXTERN +#endif + +/** + Put this (LV2_SYMBOL_EXPORT) before any functions that are to be loaded + by the host as a symbol from the dynamic library. +*/ +#ifdef _WIN32 +# define LV2_SYMBOL_EXPORT LV2_SYMBOL_EXTERN __declspec(dllexport) +#else +# define LV2_SYMBOL_EXPORT \ + LV2_SYMBOL_EXTERN __attribute__((visibility("default"))) +#endif + +/** + Prototype for plugin accessor function. + + Plugins are discovered by hosts using RDF data (not by loading libraries). + See http://lv2plug.in for details on the discovery process, though most + hosts should use an existing library to implement this functionality. + + This is the simple plugin discovery API, suitable for most statically + defined plugins. Advanced plugins that need access to their bundle during + discovery can use lv2_lib_descriptor() instead. Plugin libraries MUST + include a function called "lv2_descriptor" or "lv2_lib_descriptor" with + C-style linkage, but SHOULD provide "lv2_descriptor" wherever possible. + + When it is time to load a plugin (designated by its URI), the host loads the + plugin's library, gets the lv2_descriptor() function from it, and uses this + function to find the LV2_Descriptor for the desired plugin. Plugins are + accessed by index using values from 0 upwards. This function MUST return + NULL for out of range indices, so the host can enumerate plugins by + increasing `index` until NULL is returned. + + Note that `index` has no meaning, hosts MUST NOT depend on it remaining + consistent between loads of the plugin library. +*/ +LV2_SYMBOL_EXPORT +const LV2_Descriptor* +lv2_descriptor(uint32_t index); + +/** + Type of the lv2_descriptor() function in a library (old discovery API). +*/ +typedef const LV2_Descriptor* (*LV2_Descriptor_Function)(uint32_t index); + +/** + Handle for a library descriptor. +*/ +typedef void* LV2_Lib_Handle; + +/** + Descriptor for a plugin library. + + To access a plugin library, the host creates an LV2_Lib_Descriptor via the + lv2_lib_descriptor() function in the shared object. +*/ +typedef struct { + /** + Opaque library data which must be passed as the first parameter to all + the methods of this struct. + */ + LV2_Lib_Handle handle; + + /** + The total size of this struct. This allows for this struct to be + expanded in the future if necessary. This MUST be set by the library to + sizeof(LV2_Lib_Descriptor). The host MUST NOT access any fields of this + struct beyond get_plugin() unless this field indicates they are present. + */ + uint32_t size; + + /** + Destroy this library descriptor and free all related resources. + */ + void (*cleanup)(LV2_Lib_Handle handle); + + /** + Plugin accessor. + + Plugins are accessed by index using values from 0 upwards. Out of range + indices MUST result in this function returning NULL, so the host can + enumerate plugins by increasing `index` until NULL is returned. + */ + const LV2_Descriptor* (*get_plugin)(LV2_Lib_Handle handle, uint32_t index); +} LV2_Lib_Descriptor; + +/** + Prototype for library accessor function. + + This is the more advanced discovery API, which allows plugin libraries to + access their bundles during discovery, which makes it possible for plugins to + be dynamically defined by files in their bundle. This API also has an + explicit cleanup function, removing any need for non-portable shared library + destructors. Simple plugins that do not require these features may use + lv2_descriptor() instead. + + This is the entry point for a plugin library. Hosts load this symbol from + the library and call this function to obtain a library descriptor which can + be used to access all the contained plugins. The returned object must not + be destroyed (using LV2_Lib_Descriptor::cleanup()) until all plugins loaded + from that library have been destroyed. +*/ +LV2_SYMBOL_EXPORT +const LV2_Lib_Descriptor* +lv2_lib_descriptor(const char* bundle_path, const LV2_Feature* const* features); + +/** + Type of the lv2_lib_descriptor() function in an LV2 library. +*/ +typedef const LV2_Lib_Descriptor* (*LV2_Lib_Descriptor_Function)( + const char* bundle_path, + const LV2_Feature* const* features); + +#ifdef __cplusplus +} /* extern "C" */ +#endif + +/** + @} + @} +*/ + +#endif /* LV2_H_INCLUDED */ diff --git a/include/lv2/core/lv2_util.h b/include/lv2/core/lv2_util.h new file mode 100644 index 0000000..f3766aa --- /dev/null +++ b/include/lv2/core/lv2_util.h @@ -0,0 +1,103 @@ +/* + Copyright 2016 David Robillard <d@drobilla.net> + + Permission to use, copy, modify, and/or distribute this software for any + purpose with or without fee is hereby granted, provided that the above + copyright notice and this permission notice appear in all copies. + + THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. +*/ + +/** + @defgroup util Utilities + @ingroup lv2core + @{ +*/ + +#include "lv2/core/lv2.h" + +#include <stdarg.h> +#include <stdbool.h> +#include <string.h> + +#ifdef __cplusplus +extern "C" { +#endif + +/** + Return the data for a feature in a features array. + + If the feature is not found, NULL is returned. Note that this function is + only useful for features with data, and can not detect features that are + present but have NULL data. +*/ +static inline void* +lv2_features_data(const LV2_Feature* const* features, const char* const uri) +{ + if (features) { + for (const LV2_Feature* const* f = features; *f; ++f) { + if (!strcmp(uri, (*f)->URI)) { + return (*f)->data; + } + } + } + return NULL; +} + +/** + Query a features array. + + This function allows getting several features in one call, and detect + missing required features, with the same caveat of lv2_features_data(). + + The arguments should be a series of const char* uri, void** data, bool + required, terminated by a NULL URI. The data pointers MUST be initialized + to NULL. For example: + + @code + LV2_URID_Log* log = NULL; + LV2_URID_Map* map = NULL; + const char* missing = lv2_features_query( + features, + LV2_LOG__log, &log, false, + LV2_URID__map, &map, true, + NULL); + @endcode + + @return NULL on success, otherwise the URI of this missing feature. +*/ +static inline const char* +lv2_features_query(const LV2_Feature* const* features, ...) +{ + va_list args; + va_start(args, features); + + const char* uri = NULL; + while ((uri = va_arg(args, const char*))) { + void** data = va_arg(args, void**); + bool required = (bool)va_arg(args, int); + + *data = lv2_features_data(features, uri); + if (required && !*data) { + va_end(args); + return uri; + } + } + + va_end(args); + return NULL; +} + +#ifdef __cplusplus +} /* extern "C" */ +#endif + +/** + @} +*/ |