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Diffstat (limited to 'lv2/lv2plug.in')
| -rw-r--r-- | lv2/lv2plug.in/ns/lv2core/Plugin.hpp | 256 |
1 files changed, 0 insertions, 256 deletions
diff --git a/lv2/lv2plug.in/ns/lv2core/Plugin.hpp b/lv2/lv2plug.in/ns/lv2core/Plugin.hpp deleted file mode 100644 index 763b4ff..0000000 --- a/lv2/lv2plug.in/ns/lv2core/Plugin.hpp +++ /dev/null @@ -1,256 +0,0 @@ -/* - Copyright 2015 David Robillard <http://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_PLUGIN_HPP -#define LV2_PLUGIN_HPP - -#include "lv2/lv2plug.in/ns/lv2core/lv2.h" - -namespace lv2 { - -/** - C++ wrapper for an LV2 plugin. - - This interface is a convenience for plugin authors only, and is not an ABI - used by hosts. Plugin authors should inherit from this interface, and use - the resulting class as the template parameter to lv2::set_descriptor() to - initialise a descriptor for the plugin. - - This class is a stateless interface and imposes no restrictions or overhead - compared to a plugin implemented using the underlying C interface. Note - that this is not a virtual class, so calling methods from a Plugin* base - pointer will not work. Instead, anything that must dispatch on Plugin - methods takes a template parameter for static dispatch. -*/ -class Plugin -{ -public: - /** - 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 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. - */ - Plugin(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 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(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() {} - - /** - 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 (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 - `sample_count` is 0. - - @param sample_count The block size (in samples) for which the plugin - instance must run. - */ - void run(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() {} - - /** - 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. - */ - static const void* extension_data(const char* uri) { return NULL; } -}; - -template<typename Plugin> -static LV2_Handle s_instantiate(const LV2_Descriptor* descriptor, - double sample_rate, - const char* bundle_path, - const LV2_Feature* const* features) { - Plugin* t = new Plugin(sample_rate, bundle_path, features); - if (!t) { - delete t; - return nullptr; - } - - return reinterpret_cast<LV2_Handle>(t); -} - -template<typename Plugin> -static void s_connect_port(LV2_Handle instance, uint32_t port, void* buf) -{ - reinterpret_cast<Plugin*>(instance)->connect_port(port, buf); -} - -template<typename Plugin> -static void s_activate(LV2_Handle instance) -{ - reinterpret_cast<Plugin*>(instance)->activate(); -} - -template<typename Plugin> -static void s_run(LV2_Handle instance, uint32_t sample_count) -{ - reinterpret_cast<Plugin*>(instance)->run(sample_count); -} - -template<typename Plugin> -static void s_deactivate(LV2_Handle instance) -{ - reinterpret_cast<Plugin*>(instance)->deactivate(); -} - -template<typename Plugin> -static void s_cleanup(LV2_Handle instance) -{ - delete reinterpret_cast<Plugin*>(instance); -} - -/** - Get an LV2_Descriptor for a plugin class. - - @code - static const LV2_Descriptor a = lv2::descriptor<Amp>("http://example.org/amp"); - @endcode -*/ -template<typename Plugin> -static LV2_Descriptor -descriptor(const char* uri) -{ - const LV2_Descriptor desc = { uri, - &s_instantiate<Plugin>, - &s_connect_port<Plugin>, - &s_activate<Plugin>, - &s_run<Plugin>, - &s_deactivate<Plugin>, - &s_cleanup<Plugin>, - &Plugin::extension_data }; - return desc; -} - -} /* namespace lv2 */ - -#endif /* LV2_PLUGIN_HPP */ |