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-/*
- LV2 - An audio plugin interface specification.
- Copyright 2006-2011 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.
-*/
-
-/**
- @file lv2.h
- API for the LV2 specification <http://lv2plug.in/ns/lv2core>.
- Revision: 4.1
-*/
-
-#ifndef LV2_H_INCLUDED
-#define LV2_H_INCLUDED
-
-#include <stdint.h>
-
-#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 @ref URI and @ref data to be used if necessary.
- Some features, such as lv2:isLive, do not require the host to pass data.
-*/
-typedef struct _LV2_Feature {
- /**
- 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 @ref 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 (e.g. '/') 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 lv2.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 (e.g. 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
- lv2.ttl for details).
-
- As a special case, when @c sample_count == 0, the plugin should update
- any output ports that represent a single instant in time (e.g. 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
- @c sample_count == 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 extenion.
-
- 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;
-
-/**
- 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.
-
- A plugin library MUST include a function called "lv2_descriptor" with this
- prototype. This function MUST have C-style linkage (if you are using C++
- this is taken care of by the 'extern "C"' clause at the top of this file).
-
- 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 @c index until NULL is returned.
-
- Note that @c index has no meaning, hosts MUST NOT depend on it remaining
- consistent between loads of the plugin library.
-*/
-const LV2_Descriptor * lv2_descriptor(uint32_t index);
-
-/**
- Type of the lv2_descriptor() function in a plugin library.
-*/
-typedef const LV2_Descriptor *
-(*LV2_Descriptor_Function)(uint32_t index);
-
-/**
- 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 __declspec(dllexport)
-#else
-#define LV2_SYMBOL_EXPORT
-#endif
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* LV2_H_INCLUDED */