/* Copyright 2007-2011 David Robillard 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 slv2.h API for SLV2, a lightweight LV2 host library. */ #ifndef SLV2_SLV2_H #define SLV2_SLV2_H #include #include #include #include "lv2/lv2plug.in/ns/lv2core/lv2.h" #ifdef SLV2_SHARED # ifdef __WIN32__ # define SLV2_LIB_IMPORT __declspec(dllimport) # define SLV2_LIB_EXPORT __declspec(dllexport) # else # define SLV2_LIB_IMPORT __attribute__((visibility("default"))) # define SLV2_LIB_EXPORT __attribute__((visibility("default"))) # endif # ifdef SLV2_INTERNAL # define SLV2_API SLV2_LIB_EXPORT # else # define SLV2_API SLV2_LIB_IMPORT # endif #else # define SLV2_API #endif #ifdef __GNUC__ # ifdef SLV2_INTERNAL # define SLV2_DEPRECATED # else # define SLV2_DEPRECATED __attribute__((__deprecated__)) # endif #else # define SLV2_DEPRECATED #endif #ifdef __cplusplus extern "C" { #endif #define SLV2_NAMESPACE_LV2 "http://lv2plug.in/ns/lv2core#" #define SLV2_PORT_CLASS_PORT "http://lv2plug.in/ns/lv2core#Port" #define SLV2_PORT_CLASS_INPUT "http://lv2plug.in/ns/lv2core#InputPort" #define SLV2_PORT_CLASS_OUTPUT "http://lv2plug.in/ns/lv2core#OutputPort" #define SLV2_PORT_CLASS_CONTROL "http://lv2plug.in/ns/lv2core#ControlPort" #define SLV2_PORT_CLASS_AUDIO "http://lv2plug.in/ns/lv2core#AudioPort" #define SLV2_PORT_CLASS_EVENT "http://lv2plug.in/ns/ext/event#EventPort" #define SLV2_EVENT_CLASS_MIDI "http://lv2plug.in/ns/ext/midi#MidiEvent" typedef struct _SLV2Plugin* SLV2Plugin; /**< LV2 Plugin. */ typedef struct _SLV2PluginClass* SLV2PluginClass; /**< Plugin Class. */ typedef struct _SLV2Port* SLV2Port; /**< Port. */ typedef struct _SLV2ScalePoint* SLV2ScalePoint; /**< Scale Point (Notch). */ typedef struct _SLV2UI* SLV2UI; /**< Plugin UI. */ typedef struct _SLV2Value* SLV2Value; /**< Typed Value. */ typedef struct _SLV2World* SLV2World; /**< SLV2 World. */ typedef struct _SLV2UIInstance* SLV2UIInstance; /**< Plugin UI Instance. */ /** A UI host descriptor. A UI host descriptor contains the various functions that a plugin UI may use to communicate with the plugin. It is passed to @ref slv2_ui_instance_new to provide these functions to the UI. */ typedef struct _SLV2UIHost* SLV2UIHost; typedef void* SLV2PluginClasses; /**< set. */ typedef void* SLV2Plugins; /**< set. */ typedef void* SLV2ScalePoints; /**< set. */ typedef void* SLV2UIs; /**< set. */ typedef void* SLV2Values; /**< set. */ /** @defgroup slv2 SLV2 SLV2 is a simple yet powerful C API for using LV2 plugins. For more information about LV2, see . For more information about SLV2, see . @{ */ /** @name Value @{ */ /** Convert a file URI string to a local path string. For example, "file://foo/bar/baz.ttl" returns "/foo/bar/baz.ttl". Return value is shared and must not be deleted by caller. @return @a uri converted to a path, or NULL on failure (URI is not local). */ SLV2_API const char* slv2_uri_to_path(const char* uri); /** Create a new URI value. Returned value must be freed by caller with slv2_value_free. */ SLV2_API SLV2Value slv2_value_new_uri(SLV2World world, const char* uri); /** Create a new string value (with no language). Returned value must be freed by caller with slv2_value_free. */ SLV2_API SLV2Value slv2_value_new_string(SLV2World world, const char* str); /** Create a new integer value. Returned value must be freed by caller with slv2_value_free. */ SLV2_API SLV2Value slv2_value_new_int(SLV2World world, int val); /** Create a new floating point value. Returned value must be freed by caller with slv2_value_free. */ SLV2_API SLV2Value slv2_value_new_float(SLV2World world, float val); /** Create a new boolean value. Returned value must be freed by caller with slv2_value_free. */ SLV2_API SLV2Value slv2_value_new_bool(SLV2World world, bool val); /** Free an SLV2Value. */ SLV2_API void slv2_value_free(SLV2Value val); /** Duplicate an SLV2Value. */ SLV2_API SLV2Value slv2_value_duplicate(SLV2Value val); /** Return whether two values are equivalent. */ SLV2_API bool slv2_value_equals(SLV2Value value, SLV2Value other); /** Return this value as a Turtle/SPARQL token. Returned value must be freed by caller with slv2_value_free.
Example Turtle Tokens
URI<http://example.org/foo >
QNamedoap:name
String"this is a string"
Float1.0
Integer1
Booleantrue
*/ SLV2_API char* slv2_value_get_turtle_token(SLV2Value value); /** Return whether the value is a URI (resource). */ SLV2_API bool slv2_value_is_uri(SLV2Value value); /** Return this value as a URI string, e.g. "http://example.org/foo". Valid to call only if slv2_value_is_uri(@a value) returns true. Returned value is owned by @a value and must not be freed by caller. */ SLV2_API const char* slv2_value_as_uri(SLV2Value value); /** Return whether the value is a blank node (resource with no URI). */ SLV2_API bool slv2_value_is_blank(SLV2Value value); /** Return this value as a blank node identifier, e.g. "genid03". Valid to call only if slv2_value_is_blank(@a value) returns true. Returned value is owned by @a value and must not be freed by caller. */ SLV2_API const char* slv2_value_as_blank(SLV2Value value); /** Return whether this value is a literal (i.e. not a URI). Returns true if @a value is a string or numeric value. */ SLV2_API bool slv2_value_is_literal(SLV2Value value); /** Return whether this value is a string literal. Returns true if @a value is a string value (and not numeric). */ SLV2_API bool slv2_value_is_string(SLV2Value value); /** Return @a value as a string. */ SLV2_API const char* slv2_value_as_string(SLV2Value value); /** Return whether this value is a decimal literal. */ SLV2_API bool slv2_value_is_float(SLV2Value value); /** Return @a value as a float. Valid to call only if slv2_value_is_float(@a value) or slv2_value_is_int(@a value) returns true. */ SLV2_API float slv2_value_as_float(SLV2Value value); /** Return whether this value is an integer literal. */ SLV2_API bool slv2_value_is_int(SLV2Value value); /** Return @a value as an integer. Valid to call only if slv2_value_is_int(@a value) returns true. */ SLV2_API int slv2_value_as_int(SLV2Value value); /** Return whether this value is a boolean. */ SLV2_API bool slv2_value_is_bool(SLV2Value value); /** Return @a value as a bool. Valid to call only if slv2_value_is_bool(@a value) returns true. */ SLV2_API bool slv2_value_as_bool(SLV2Value value); /** @} @name Collections SLV2 has several collection types for holding various types of value:
  • SLV2Plugins (function prefix "slv2_plugins_")
  • SLV2PluginClasses (function prefix "slv2_plugin_classes_")
  • SLV2ScalePoints (function prefix "slv2_scale_points_")
  • SLV2Values (function prefix "slv2_values_")
  • SLV2UIs (function prefix "slv2_uis_")
Each collection type supports a similar basic API:
  • void PREFIX_free (coll)
  • unsigned PREFIX_size (coll)
  • SLV2Iter PREFIX_begin (coll)
  • ELEM PREFIX_get_at (coll, index) (DEPRECATED)
@{ */ /* Iter */ typedef void* SLV2Iter; /** Increment @a i to point at the next element in the collection. */ SLV2_API SLV2Iter slv2_iter_next(SLV2Iter i); /** Return true iff @a i is at the end of the collection. */ SLV2_API bool slv2_iter_end(SLV2Iter i); /* Collection */ typedef void* SLV2Collection; SLV2_API SLV2Iter slv2_collection_begin(SLV2Collection collection); SLV2_API void* slv2_collection_get(SLV2Collection collection, SLV2Iter i); #define SLV2_FOREACH(iter, collection) \ for (SLV2Iter (iter) = slv2_collection_begin(collection); \ !slv2_iter_end(iter); \ (iter) = slv2_iter_next(iter)) /* SLV2PluginClasses */ SLV2_API void slv2_plugin_classes_free(SLV2PluginClasses collection); SLV2_API unsigned slv2_plugin_classes_size(SLV2PluginClasses collection); SLV2_API SLV2Iter slv2_plugin_classes_begin(SLV2PluginClasses collection); SLV2_API SLV2PluginClass slv2_plugin_classes_get(SLV2PluginClasses collection, SLV2Iter i); SLV2_DEPRECATED SLV2_API SLV2PluginClass slv2_plugin_classes_get_at(SLV2PluginClasses collection, unsigned index); /* SLV2ScalePoints */ SLV2_API SLV2ScalePoints slv2_scale_points_new(void); SLV2_API void slv2_scale_points_free(SLV2ScalePoints collection); SLV2_API unsigned slv2_scale_points_size(SLV2ScalePoints collection); SLV2_API SLV2Iter slv2_scale_points_begin(SLV2ScalePoints collection); SLV2_API SLV2ScalePoint slv2_scale_points_get(SLV2ScalePoints collection, SLV2Iter i); SLV2_DEPRECATED SLV2_API SLV2ScalePoint slv2_scale_points_get_at(SLV2ScalePoints collection, unsigned index); /* UIs */ SLV2_API void slv2_uis_free(SLV2UIs collection); SLV2_API unsigned slv2_uis_size(SLV2UIs collection); SLV2_API SLV2Iter slv2_uis_begin(SLV2UIs collection); SLV2_API SLV2UI slv2_uis_get(SLV2UIs collection, SLV2Iter i); SLV2_DEPRECATED SLV2_API SLV2UI slv2_uis_get_at(SLV2UIs collection, unsigned index); /* Values */ SLV2_API SLV2ScalePoints slv2_values_new(void); SLV2_API void slv2_values_free(SLV2Values collection); SLV2_API unsigned slv2_values_size(SLV2Values collection); SLV2_API SLV2Iter slv2_values_begin(SLV2Values collection); SLV2_API SLV2Value slv2_values_get(SLV2Values collection, SLV2Iter i); SLV2_API SLV2Value slv2_values_get_first(SLV2Values collection); SLV2_DEPRECATED SLV2_API SLV2Value slv2_values_get_at(SLV2Values collection, unsigned index); /* Plugins */ SLV2_API unsigned slv2_plugins_size(SLV2Plugins collection); SLV2_API SLV2Iter slv2_plugins_begin(SLV2Plugins collection); SLV2_API SLV2Plugin slv2_plugins_get(SLV2Plugins collection, SLV2Iter i); SLV2_DEPRECATED SLV2_API SLV2Plugin slv2_plugins_get_at(SLV2Plugins collection, unsigned index); /** This function is deprecated, it does nothing. */ SLV2_DEPRECATED SLV2_API void slv2_plugins_free(SLV2World world, SLV2Plugins plugins); /** Get a plugin from @a plugins by URI. Return value is shared (stored in @a plugins) and must not be freed or modified by the caller in any way. @return NULL if no plugin with @a uri is found in @a plugins. */ SLV2_API SLV2Plugin slv2_plugins_get_by_uri(SLV2Plugins plugins, SLV2Value uri); /** Get a plugin class from @a classes by URI. Return value is shared (stored in @a classes) and must not be freed or modified by the caller in any way. @return NULL if no plugin class with @a uri is found in @a classes. */ SLV2_API SLV2PluginClass slv2_plugin_classes_get_by_uri(SLV2PluginClasses classes, SLV2Value uri); /** Return whether @a values contains @a value. */ SLV2_API bool slv2_values_contains(SLV2Values values, SLV2Value value); /** @} @name World The "world" represents all SLV2 state, and is used to discover/load/cache LV2 data (plugins, UIs, and extensions). Normal hosts which just need to load plugins by URI should simply use @ref slv2_world_load_all to discover/load the system's LV2 resources. @{ */ /** Initialize a new, empty world. If initialization fails, NULL is returned. */ SLV2_API SLV2World slv2_world_new(void); /** Enable/disable language filtering. Language filtering applies to any functions that return (a) value(s). With filtering enabled, SLV2 will automatically return the best value(s) for the current LANG. With filtering disabled, all matching values will be returned regardless of language tag. Filtering is enabled by default. */ #define SLV2_OPTION_FILTER_LANG "http://drobilla.net/ns/slv2#filter-lang" /** Enable/disable dynamic manifest support. Dynamic manifest data will only be loaded if this option is true. */ #define SLV2_OPTION_DYN_MANIFEST "http://drobilla.net/ns/slv2#dyn-manifest" /** Set an SLV2 option for @a world. Currently recognized options: @ref SLV2_OPTION_FILTER_LANG @ref SLV2_OPTION_DYN_MANIFEST */ SLV2_API void slv2_world_set_option(SLV2World world, const char* uri, const SLV2Value value); /** Destroy the world, mwahaha. Note that destroying @a world will destroy all the objects it contains (e.g. instances of SLV2Plugin). Do not destroy the world until you are finished with all objects that came from it. */ SLV2_API void slv2_world_free(SLV2World world); /** Load all installed LV2 bundles on the system. This is the recommended way for hosts to load LV2 data. It implements the established/standard best practice for discovering all LV2 data on the system. The environment variable LV2_PATH may be used to control where this function will look for bundles. Hosts should use this function rather than explicitly load bundles, except in special circumstances (e.g. development utilities, or hosts that ship with special plugin bundles which are installed to a known location). */ SLV2_API void slv2_world_load_all(SLV2World world); /** Load a specific bundle. @a bundle_uri must be a fully qualified URI to the bundle directory, with the trailing slash, eg. file:///usr/lib/lv2/foo.lv2/ Normal hosts should not need this function (use slv2_world_load_all). Hosts MUST NOT attach any long-term significance to bundle paths (e.g. in save files), since there are no guarantees they will remain unchanged between (or even during) program invocations. Plugins (among other things) MUST be identified by URIs (not paths) in save files. */ SLV2_API void slv2_world_load_bundle(SLV2World world, SLV2Value bundle_uri); /** Get the parent of all other plugin classes, lv2:Plugin. */ SLV2_API SLV2PluginClass slv2_world_get_plugin_class(SLV2World world); /** Return a list of all found plugin classes. Returned list is owned by world and must not be freed by the caller. */ SLV2_API SLV2PluginClasses slv2_world_get_plugin_classes(SLV2World world); /** Return a list of all found plugins. The returned list contains just enough references to query or instantiate plugins. The data for a particular plugin will not be loaded into memory until a call to an slv2_plugin_* function results in a query (at which time the data is cached with the SLV2Plugin so future queries are very fast). The returned list and the plugins it contains are owned by @a world and must not be freed by caller. */ SLV2_API SLV2Plugins slv2_world_get_all_plugins(SLV2World world); /** Return the plugin with the given @a uri, or NULL if not found. */ SLV2_API SLV2Plugin slv2_world_get_plugin_by_uri_string(SLV2World world, const char* uri); /** @} @name Plugin @{ */ /** Check if @a plugin is valid. This is not a rigorous validator, but can be used to reject some malformed plugins that could cause bugs (e.g. plugins with missing required fields). Note that normal hosts do NOT need to use this - slv2 does not load invalid plugins into plugin lists. This is included for plugin testing utilities, etc. @return true iff @a plugin is valid. */ SLV2_API bool slv2_plugin_verify(SLV2Plugin plugin); /** Get the URI of @a plugin. Any serialization that refers to plugins should refer to them by this. Hosts SHOULD NOT save any filesystem paths, plugin indexes, etc. in saved files; save only the URI. The URI is a globally unique identifier for one specific plugin. Two plugins with the same URI are compatible in port signature, and should be guaranteed to work in a compatible and consistent way. If a plugin is upgraded in an incompatible way (eg if it has different ports), it MUST have a different URI than it's predecessor. @return A shared URI value which must not be modified or freed. */ SLV2_API SLV2Value slv2_plugin_get_uri(SLV2Plugin plugin); /** Get the (resolvable) URI of the plugin's "main" bundle. This returns the URI of the bundle where the plugin itself was found. Note that the data for a plugin may be spread over many bundles, that is, slv2_plugin_get_data_uris may return URIs which are not within this bundle. Typical hosts should not need to use this function. Note this always returns a fully qualified URI. If you want a local filesystem path, use slv2_uri_to_path. @return a shared string which must not be modified or freed. */ SLV2_API SLV2Value slv2_plugin_get_bundle_uri(SLV2Plugin plugin); /** Get the (resolvable) URIs of the RDF data files that define a plugin. Typical hosts should not need to use this function. Note this always returns fully qualified URIs. If you want local filesystem paths, use slv2_uri_to_path. @return a list of complete URLs eg. "file:///foo/ABundle.lv2/aplug.ttl", which is shared and must not be modified or freed. */ SLV2_API SLV2Values slv2_plugin_get_data_uris(SLV2Plugin plugin); /** Get the (resolvable) URI of the shared library for @a plugin. Note this always returns a fully qualified URI. If you want a local filesystem path, use slv2_uri_to_path. @return a shared string which must not be modified or freed. */ SLV2_API SLV2Value slv2_plugin_get_library_uri(SLV2Plugin plugin); /** Get the name of @a plugin. This returns the name (doap:name) of the plugin. The name may be translated according to the current locale, this value MUST NOT be used as a plugin identifier (use the URI for that). Returned value must be freed by the caller. */ SLV2_API SLV2Value slv2_plugin_get_name(SLV2Plugin plugin); /** Get the class this plugin belongs to (ie Filters). */ SLV2_API SLV2PluginClass slv2_plugin_get_class(SLV2Plugin plugin); /** Get a value associated with the plugin in a plugin's data files. @a predicate must be either a URI or a QName. Returns the ?object of all triples found of the form: <plugin-uri> predicate ?object May return NULL if the property was not found, or if object(s) is not sensibly represented as an SLV2Values (e.g. blank nodes). Return value must be freed by caller with slv2_values_free. */ SLV2_API SLV2Values slv2_plugin_get_value(SLV2Plugin p, SLV2Value predicate); /** Get a value associated with the plugin in a plugin's data files. This function is identical to slv2_plugin_get_value, but takes a QName string parameter for a predicate instead of an SLV2Value, which may be more convenient. */ SLV2_API SLV2Values slv2_plugin_get_value_by_qname(SLV2Plugin p, const char* predicate); /** Get a value associated with some subject in a plugin's data files. @a predicate must be either a URI or a QName. Returns the ?object of all triples found of the form: subject predicate ?object This can be used to investigate URIs returned by slv2_plugin_get_value (if information about it is contained in the plugin's data files). May return NULL if the property was not found, or if object is not sensibly represented as an SLV2Values (e.g. blank nodes). Return value must be freed by caller with slv2_values_free. */ SLV2_API SLV2Values slv2_plugin_get_value_for_subject(SLV2Plugin p, SLV2Value subject_uri, SLV2Value predicate_uri); /** Return whether a feature is supported by a plugin. This will return true if the feature is an optional or required feature of the plugin. */ SLV2_API bool slv2_plugin_has_feature(SLV2Plugin p, SLV2Value feature_uri); /** Get the LV2 Features supported (required or optionally) by a plugin. A feature is "supported" by a plugin if it is required OR optional. * Since required features have special rules the host must obey, this function probably shouldn't be used by normal hosts. Using slv2_plugin_get_optional_features and slv2_plugin_get_required_features separately is best in most cases. * Returned value must be freed by caller with slv2_values_free. */ SLV2_API SLV2Values slv2_plugin_get_supported_features(SLV2Plugin p); /** Get the LV2 Features required by a plugin. If a feature is required by a plugin, hosts MUST NOT use the plugin if they do not understand (or are unable to support) that feature. All values returned here MUST be passed to the plugin's instantiate method (along with data, if necessary, as defined by the feature specification) or plugin instantiation will fail. Return value must be freed by caller with slv2_values_free. */ SLV2_API SLV2Values slv2_plugin_get_required_features(SLV2Plugin p); /** Get the LV2 Features optionally supported by a plugin. Hosts MAY ignore optional plugin features for whatever reasons. Plugins MUST operate (at least somewhat) if they are instantiated without being passed optional features. Return value must be freed by caller with slv2_values_free. */ SLV2_API SLV2Values slv2_plugin_get_optional_features(SLV2Plugin p); /** Get the number of ports on this plugin. */ SLV2_API uint32_t slv2_plugin_get_num_ports(SLV2Plugin p); /** Get the port ranges (minimum, maximum and default values) for all ports. @a min_values, @a max_values and @a def_values must either point to an array of N floats, where N is the value returned by slv2_plugin_get_num_ports() for this plugin, or NULL. The elements of the array will be set to the the minimum, maximum and default values of the ports on this plugin, with array index corresponding to port index. If a port doesn't have a minimum, maximum or default value, or the port's type is not float, the corresponding array element will be set to NAN. This is a convenience method for the common case of getting the range of all float ports on a plugin, and may be significantly faster than repeated calls to slv2_port_get_range. */ SLV2_API void slv2_plugin_get_port_ranges_float(SLV2Plugin p, float* min_values, float* max_values, float* def_values); /** Get the number of ports on this plugin that are members of some class(es). Note that this is a varargs function so ports fitting any type 'profile' desired can be found quickly. REMEMBER TO TERMINATE THE PARAMETER LIST OF THIS FUNCTION WITH NULL OR VERY NASTY THINGS WILL HAPPEN. */ SLV2_API uint32_t slv2_plugin_get_num_ports_of_class(SLV2Plugin p, SLV2Value class_1, ...); /** Return whether or not the plugin introduces (and reports) latency. The index of the latency port can be found with slv2_plugin_get_latency_port ONLY if this function returns true. */ SLV2_API bool slv2_plugin_has_latency(SLV2Plugin p); /** Return the index of the plugin's latency port. It is a fatal error to call this on a plugin without checking if the port exists by first calling slv2_plugin_has_latency. Any plugin that introduces unwanted latency that should be compensated for (by hosts with the ability/need) MUST provide this port, which is a control rate output port that reports the latency for each cycle in frames. */ SLV2_API uint32_t slv2_plugin_get_latency_port_index(SLV2Plugin p); /** Get a port on @a plugin by @a index. */ SLV2_API SLV2Port slv2_plugin_get_port_by_index(SLV2Plugin plugin, uint32_t index); /** Get a port on @a plugin by @a symbol. Note this function is slower than slv2_plugin_get_port_by_index, especially on plugins with a very large number of ports. */ SLV2_API SLV2Port slv2_plugin_get_port_by_symbol(SLV2Plugin plugin, SLV2Value symbol); /** Get the full name of the plugin's author. Returns NULL if author name is not present. Returned value must be freed by caller. */ SLV2_API SLV2Value slv2_plugin_get_author_name(SLV2Plugin plugin); /** Get the email address of the plugin's author. Returns NULL if author email address is not present. Returned value must be freed by caller. */ SLV2_API SLV2Value slv2_plugin_get_author_email(SLV2Plugin plugin); /** Get the email address of the plugin's author. Returns NULL if author homepage is not present. Returned value must be freed by caller. */ SLV2_API SLV2Value slv2_plugin_get_author_homepage(SLV2Plugin plugin); /** Return true iff @a plugin has been replaced by another plugin. The plugin will still be usable, but hosts should hide them from their user interfaces to prevent users from using deprecated plugins. */ SLV2_API bool slv2_plugin_is_replaced(SLV2Plugin plugin); /** @} @name Port @{ */ /** Port analog of slv2_plugin_get_value. */ SLV2_API SLV2Values slv2_port_get_value(SLV2Plugin plugin, SLV2Port port, SLV2Value predicate); /** Port analog of slv2_plugin_get_value_by_qname. */ SLV2_API SLV2Values slv2_port_get_value_by_qname(SLV2Plugin plugin, SLV2Port port, const char* predicate); /** Return the LV2 port properties of a port. */ SLV2_API SLV2Values slv2_port_get_properties(SLV2Plugin plugin, SLV2Port port); /** Return whether a port has a certain property. */ SLV2_API bool slv2_port_has_property(SLV2Plugin p, SLV2Port port, SLV2Value property_uri); /** Return whether a port is an event port and supports a certain event type. */ SLV2_API bool slv2_port_supports_event(SLV2Plugin p, SLV2Port port, SLV2Value event_uri); /** Get the symbol of a port. The 'symbol' is a short string, a valid C identifier. Returned value is owned by @a port and must not be freed. */ SLV2_API SLV2Value slv2_port_get_symbol(SLV2Plugin plugin, SLV2Port port); /** Get the name of a port. This is guaranteed to return the untranslated name (the doap:name in the data file without a language tag). Returned value must be freed by the caller. */ SLV2_API SLV2Value slv2_port_get_name(SLV2Plugin plugin, SLV2Port port); /** Get all the classes of a port. This can be used to determine if a port is an input, output, audio, control, midi, etc, etc, though it's simpler to use slv2_port_is_a. The returned list does not include lv2:Port, which is implied. Returned value is shared and must not be destroyed by caller. */ SLV2_API SLV2Values slv2_port_get_classes(SLV2Plugin plugin, SLV2Port port); /** Determine if a port is of a given class (input, output, audio, etc). For convenience/performance/extensibility reasons, hosts are expected to create an SLV2Value for each port class they "care about". Well-known type URI strings are defined (e.g. SLV2_PORT_CLASS_INPUT) for convenience, but this function is designed so that SLV2 is usable with any port types without requiring explicit support in SLV2. */ SLV2_API bool slv2_port_is_a(SLV2Plugin plugin, SLV2Port port, SLV2Value port_class); /** Get the default, minimum, and maximum values of a port. @a def, @a min, and @a max are outputs, pass pointers to uninitialized (i.e. NOT created with slv2_value_new) SLV2Value variables. These will be set to point at new values (which must be freed by the caller using slv2_value_free), or NULL if the value does not exist. */ SLV2_API void slv2_port_get_range(SLV2Plugin plugin, SLV2Port port, SLV2Value* deflt, SLV2Value* min, SLV2Value* max); /** Get the scale points (enumeration values) of a port. This returns a collection of 'interesting' named values of a port (e.g. appropriate entries for a UI selector associated with this port). Returned value may be NULL if @a port has no scale points, otherwise it must be freed by caller with slv2_scale_points_free. */ SLV2_API SLV2ScalePoints slv2_port_get_scale_points(SLV2Plugin plugin, SLV2Port port); /** @} @name Scale Point @{ */ /** Get the label of this scale point (enumeration value) Returned value is owned by @a point and must not be freed. */ SLV2_API SLV2Value slv2_scale_point_get_label(SLV2ScalePoint point); /** Get the value of this scale point (enumeration value) Returned value is owned by @a point and must not be freed. */ SLV2_API SLV2Value slv2_scale_point_get_value(SLV2ScalePoint point); /** @} @name Plugin Class @{ */ /** Get the URI of this class' superclass. Returned value is owned by @a plugin_class and must not be freed by caller. Returned value may be NULL, if class has no parent. */ SLV2_API SLV2Value slv2_plugin_class_get_parent_uri(SLV2PluginClass plugin_class); /** Get the URI of this plugin class. Returned value is owned by @a plugin_class and must not be freed by caller. */ SLV2_API SLV2Value slv2_plugin_class_get_uri(SLV2PluginClass plugin_class); /** Get the label of this plugin class, ie "Oscillators". Returned value is owned by @a plugin_class and must not be freed by caller. */ SLV2_API SLV2Value slv2_plugin_class_get_label(SLV2PluginClass plugin_class); /** Get the subclasses of this plugin class. Returned value must be freed by caller with slv2_plugin_classes_free. */ SLV2_API SLV2PluginClasses slv2_plugin_class_get_children(SLV2PluginClass plugin_class); /** @} @name Plugin Instance @{ */ typedef struct _SLV2InstanceImpl* SLV2InstanceImpl; /** @cond 0 */ /* Instance of a plugin. This is exposed in the ABI to allow inlining of performance critical functions like slv2_instance_run (simple wrappers of functions in lv2.h). This is for performance reasons, user code should not use this definition in any way (which is why it is not machine documented). Truly private implementation details are hidden via @a ref pimpl. */ typedef struct _Instance { const LV2_Descriptor* lv2_descriptor; LV2_Handle lv2_handle; SLV2InstanceImpl pimpl; }* SLV2Instance; /** @endcond */ /** Instantiate a plugin. The returned value is a lightweight handle for an LV2 plugin instance, it does not refer to @a plugin, or any other SLV2 state. The caller must eventually free it with slv2_instance_free. @a features is a NULL-terminated array of features the host supports. NULL may be passed if the host supports no additional features. @return NULL if instantiation failed. */ SLV2_API SLV2Instance slv2_plugin_instantiate(SLV2Plugin plugin, double sample_rate, const LV2_Feature*const* features); /** Free a plugin instance. @a instance is invalid after this call. */ SLV2_API void slv2_instance_free(SLV2Instance instance); #ifndef SLV2_INTERNAL /** Get the URI of the plugin which @a instance is an instance of. Returned string is shared and must not be modified or deleted. */ static inline const char* slv2_instance_get_uri(SLV2Instance instance) { return instance->lv2_descriptor->URI; } /** Connect a port to a data location. This may be called regardless of whether the plugin is activated, activation and deactivation does not destroy port connections. */ static inline void slv2_instance_connect_port(SLV2Instance instance, uint32_t port_index, void* data_location) { instance->lv2_descriptor->connect_port (instance->lv2_handle, port_index, data_location); } /** Activate a plugin instance. This resets all state information in the plugin, except for port data locations (as set by slv2_instance_connect_port). This MUST be called before calling slv2_instance_run. */ static inline void slv2_instance_activate(SLV2Instance instance) { if (instance->lv2_descriptor->activate) instance->lv2_descriptor->activate(instance->lv2_handle); } /** Run @a instance for @a sample_count frames. If the hint lv2:hardRTCapable is set for this plugin, this function is guaranteed not to block. */ static inline void slv2_instance_run(SLV2Instance instance, uint32_t sample_count) { instance->lv2_descriptor->run(instance->lv2_handle, sample_count); } /** Deactivate a plugin instance. Note that to run the plugin after this you must activate it, which will reset all state information (except port connections). */ static inline void slv2_instance_deactivate(SLV2Instance instance) { if (instance->lv2_descriptor->deactivate) instance->lv2_descriptor->deactivate(instance->lv2_handle); } /** Get extension data from the plugin instance. The type and semantics of the data returned is specific to the particular extension, though in all cases it is shared and must not be deleted. */ static inline const void* slv2_instance_get_extension_data(SLV2Instance instance, const char* uri) { if (instance->lv2_descriptor->extension_data) return instance->lv2_descriptor->extension_data(uri); else return NULL; } /** Get the LV2_Descriptor of the plugin instance. Normally hosts should not need to access the LV2_Descriptor directly, use the slv2_instance_* functions. The returned descriptor is shared and must not be deleted. */ static inline const LV2_Descriptor* slv2_instance_get_descriptor(SLV2Instance instance) { return instance->lv2_descriptor; } /** Get the LV2_Handle of the plugin instance. Normally hosts should not need to access the LV2_Handle directly, use the slv2_instance_* functions. The returned handle is shared and must not be deleted. */ static inline LV2_Handle slv2_instance_get_handle(SLV2Instance instance) { return instance->lv2_handle; } #endif /* SLV2_INTERNAL */ /** @} @name Plugin UI @{ */ /** Get all UIs for @a plugin. Returned value must be freed by caller using slv2_uis_free. */ SLV2_API SLV2UIs slv2_plugin_get_uis(SLV2Plugin plugin); /** Get a UI from @a uis by URI. Return value is shared (stored in @a uis) and must not be freed or modified by the caller in any way. @return NULL if no UI with @a uri is found in @a list. */ SLV2_API SLV2UI slv2_uis_get_by_uri(SLV2UIs uis, SLV2Value uri); /** Get the URI of a Plugin UI. @param ui The Plugin UI @return a shared value which must not be modified or freed. */ SLV2_API SLV2Value slv2_ui_get_uri(SLV2UI ui); /** Get the types (URIs of RDF classes) of a Plugin UI. @param ui The Plugin UI @return a shared value which must not be modified or freed. Note that in most cases slv2_ui_is_supported should be used which finds the UI type, avoding the need to use this function (and type specific logic). */ SLV2_API SLV2Values slv2_ui_get_classes(SLV2UI ui); /** Check whether a plugin UI has a given type. @param ui The Plugin UI @param class_uri The URI of the LV2 UI type to check this UI against */ SLV2_API bool slv2_ui_is_a(SLV2UI ui, SLV2Value class_uri); /** Function to determine whether a UI type is supported. This is provided by the user and must return non-zero iff using a UI of type @c ui_type_uri in a container of type @c container_type_uri is supported. */ typedef unsigned (SLV2UISupportedFunc)(const char* container_type_uri, const char* ui_type_uri); /** Return true iff a Plugin UI is supported as a given widget type. @param ui The Plugin UI @param supported_func User provided supported predicate. @param container_type The widget type to host the UI within. @param ui_type (Output) If non-NULL, set to the native type of the UI which the caller must free with slv2_value_free. @return The embedding quality level returned by @c supported_func. */ SLV2_API unsigned slv2_ui_is_supported(SLV2UI ui, SLV2UISupportedFunc supported_func, SLV2Value container_type, SLV2Value* ui_type); /** Get the URI for a Plugin UI's bundle. @param ui The Plugin UI @return a shared value which must not be modified or freed. */ SLV2_API SLV2Value slv2_ui_get_bundle_uri(SLV2UI ui); /** Get the URI for a Plugin UI's shared library. @param ui The Plugin UI @return a shared value which must not be modified or freed. */ SLV2_API SLV2Value slv2_ui_get_binary_uri(SLV2UI ui); /** @} @} */ #ifdef __cplusplus } /* extern "C" */ #endif #endif /* SLV2_SLV2_H */