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Diffstat (limited to 'extensions/ui.lv2/ui.h')
| -rw-r--r-- | extensions/ui.lv2/ui.h | 247 |
1 files changed, 0 insertions, 247 deletions
diff --git a/extensions/ui.lv2/ui.h b/extensions/ui.lv2/ui.h deleted file mode 100644 index 6d64a0d..0000000 --- a/extensions/ui.lv2/ui.h +++ /dev/null @@ -1,247 +0,0 @@ -/* - LV2 UI Extension - Copyright 2009-2011 David Robillard <d@drobilla.net> - Copyright 2006-2008 Lars Luthman <lars.luthman@gmail.com> - - 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 - * C header for the LV2 UI extension <http://lv2plug.in/ns/extensions/ui>. - */ - -#ifndef LV2_UI_H -#define LV2_UI_H - -#include "lv2/lv2plug.in/ns/lv2core/lv2.h" - -#define LV2_UI_URI "http://lv2plug.in/ns/extensions/ui" - -#ifdef __cplusplus -extern "C" { -#endif - -/** - A pointer to some widget or other type of UI handle. - - The actual type is defined by the type URI of the UI. All the functionality - provided by this extension is toolkit independent, the host only needs to - pass the necessary callbacks and display the widget, if possible. Plugins - may have several UIs, in various toolkits. -*/ -typedef void* LV2UI_Widget; - -/** - A pointer to a particular instance of a UI. - - It is valid to compare this to NULL (0 for C++) but otherwise the host MUST - not attempt to interpret it. The UI plugin may use it to reference internal - instance data. -*/ -typedef void* LV2UI_Handle; - -/** - A pointer to a particular plugin controller, provided by the host. - - It is valid to compare this to NULL (0 for C++) but otherwise the UI plugin - MUST NOT attempt to interpret it. The host may use it to reference internal - instance data. -*/ -typedef void* LV2UI_Controller; - -/** - The type of the host-provided function that the UI can use to - send data to a plugin's input ports. - - The @c buffer parameter must point to a block of data, @c buffer_size bytes - large. The contents of this buffer and what the host should do with it - depends on the value of the @c format parameter. - - The @c format parameter should either be 0 or a numeric ID for a "Transfer - mechanism". Transfer mechanisms are Features and may be defined in - meta-extensions. They specify how to translate the data buffers passed to - this function to input data for the plugin ports. If a UI wishes to write - data to an input port, it must list a transfer mechanism Feature for that - port's class as an optional or required feature (depending on whether the UI - will work without being able to write to that port or not). The only - exception is when the UI wants to write single float values to input ports - of the class lv2:ControlPort, in which case @c buffer_size should always be - 4, the buffer should always contain a single IEEE-754 float, and @c format - should be 0. - - The numeric IDs for the transfer mechanisms are provided by a URI-to-integer - mapping function provided by the host, using the URI Map feature - <http://lv2plug.in/ns/ext/uri-map> with the map URI - "http://lv2plug.in/ns/extensions/ui". Thus a UI that requires transfer - mechanism features also requires the URI Map feature, but this is implicit - - the UI does not have to list the URI map feature as a required or optional - feature in it's RDF data. - - An UI MUST NOT pass a @c format parameter value (except 0) that has not been - returned by the host-provided URI mapping function for a host-supported - transfer mechanism feature URI. - - The UI MUST NOT try to write to a port for which there is no specified - transfer mechanism, or to an output port. The UI is responsible for - allocating the buffer and deallocating it after the call. -*/ -typedef void (*LV2UI_Write_Function)(LV2UI_Controller controller, - uint32_t port_index, - uint32_t buffer_size, - uint32_t format, - const void* buffer); - -/** - The implementation of a UI. - - A pointer to an object of this type is returned by the lv2ui_descriptor() - function. -*/ -typedef struct _LV2UI_Descriptor { - /** - The URI for this UI (not for the plugin it controls). - */ - const char* URI; - - /** - Create a new UI object and return a handle to it. This function works - similarly to the instantiate() member in LV2_Descriptor. - - @param descriptor The descriptor for the UI that you want to instantiate. - - @param plugin_uri The URI of the plugin that this UI will control. - - @param bundle_path The path to the bundle containing the RDF data file - that references this shared object file, including the trailing '/'. - - @param write_function A function provided by the host that the UI can use - to send data to the plugin's input ports. - - @param controller A handle for the plugin instance that should be passed - as the first parameter of @c write_function. - - @param widget A pointer to an LV2UI_Widget. The UI will write a widget - pointer to this location (what type of widget depends on the RDF class of - the UI) that will be the main UI widget. - - @param features An array of LV2_Feature pointers. The host must pass all - feature URIs that it and the UI supports and any additional data, just - like in the LV2 plugin instantiate() function. Note that UI features and - plugin features are NOT necessarily the same, they just share the same - data structure - this will probably not be the same array as the one the - plugin host passes to a plugin. - - */ - LV2UI_Handle (*instantiate)(const struct _LV2UI_Descriptor* descriptor, - const char* plugin_uri, - const char* bundle_path, - LV2UI_Write_Function write_function, - LV2UI_Controller controller, - LV2UI_Widget* widget, - const LV2_Feature* const* features); - - - /** - Destroy the UI object and the associated widget. The host must not try - to access the widget after calling this function. - */ - void (*cleanup)(LV2UI_Handle ui); - - /** - Tell the UI that something interesting has happened at a plugin port. - - What is interesting and how it is written to the buffer passed to this - function is defined by the @c format parameter, which has the same meaning - as in LV2UI_Write_Function. The only exception is ports of the class - lv2:ControlPort, for which this function should be called when the port - value changes (it does not have to be called for every single change if - the host's UI thread has problems keeping up with the thread the plugin is - running in), @c buffer_size should be 4, the buffer should contain a - single IEEE-754 float, and @c format should be 0. - - By default, the host should only call this function for input ports of the - lv2:ControlPort class. However, the default setting can be modified by - using the following URIs in the UI's RDF data: - <pre> - uiext:portNotification - uiext:noPortNotification - uiext:plugin - uiext:portIndex - </pre> - For example, if you want the UI with uri - <code><http://my.pluginui></code> for the plugin with URI - <code><http://my.plugin></code> to get notified when the value of the - output control port with index 4 changes, you would use the following - in the RDF for your UI: - <pre> - <http://my.pluginui> uiext:portNotification [ uiext:plugin <http://my.plugin> ; - uiext:portIndex 4 ] . - </pre> - and similarly with <code>uiext:noPortNotification</code> if you wanted - to prevent notifications for a port for which it would be on by default - otherwise. The UI is not allowed to request notifications for ports of - types for which no transfer mechanism is specified, if it does it should - be considered broken and the host should not load it. - - The @c buffer is only valid during the time of this function call, so if - the UI wants to keep it for later use it has to copy the contents to an - internal buffer. - - This member may be set to NULL if the UI is not interested in any - port events. - */ - void (*port_event)(LV2UI_Handle ui, - uint32_t port_index, - uint32_t buffer_size, - uint32_t format, - const void* buffer); - - /** - Return a data structure associated with an extension URI, for example - a struct containing additional function pointers. - - Avoid returning function pointers directly since standard C/C++ has no - valid way of casting a void* to a function pointer. This member may be set - to NULL if the UI is not interested in supporting any extensions. This is - similar to the extension_data() member in LV2_Descriptor. - */ - const void* (*extension_data)(const char* uri); - -} LV2UI_Descriptor; - -/** - A plugin UI programmer must include a function called "lv2ui_descriptor" - with the following function prototype within the shared object file. This - function will have C-style linkage (if you are using C++ this is taken care - of by the 'extern "C"' clause at the top of the file). This function will - be accessed by the UI host using the @c dlsym() function and called to get a - LV2UI_UIDescriptor for the wanted plugin. - - Just like lv2_descriptor(), this function takes an index parameter. The - index should only be used for enumeration and not as any sort of ID number - - the host should just iterate from 0 and upwards until the function returns - NULL or a descriptor with an URI matching the one the host is looking for. -*/ -const LV2UI_Descriptor* lv2ui_descriptor(uint32_t index); - -/** - The type of the lv2ui_descriptor() function. -*/ -typedef const LV2UI_Descriptor* (*LV2UI_DescriptorFunction)(uint32_t index); - -#ifdef __cplusplus -} -#endif - -#endif /* LV2_UI_H */ |