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-/************************************************************************
- *
- * Plugin UI extension for LV2
- *
- * Copyright (C) 2006-2011 Lars Luthman <mail@larsluthman.net>
- *
- * Based on lv2.h, which was
- *
- * Copyright (C) 2000-2002 Richard W.E. Furse, Paul Barton-Davis,
- * Stefan Westerfeld
- * Copyright (C) 2006 Steve Harris, David Robillard.
- *
- * This header is free software; you can redistribute it and/or modify it
- * under the terms of the GNU Lesser General Public License as published
- * by the Free Software Foundation; either version 2.1 of the License,
- * or (at your option) any later version.
- *
- * This header is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
- * USA.
- *
- ***********************************************************************/
-
-/**
- @file pui.h
- C API for the LV2 UI extension <http://lv2plug.in/ns/ext/pui>.
-
- This file specifies a C API for communication between an LV2 host and an
- LV2 UI. The interface is similar to the one used for actual LV2 plugins.
-
- The entry point is the function lv2ui_descriptor().
-*/
-
-#ifndef LV2_PUI_H
-#define LV2_PUI_H
-
-#include <lv2.h>
-
-/** The URI of this extension (note this is not the same as the prefix). */
-#define LV2_PUI_URI "http://lv2plug.in/ns/ext/pui"
-
-/** The numerical ID returned by LV2_PUI_Host_Descriptor::port_index() for
- invalid port symbols. */
-#define LV2_PUI_INVALID_PORT_INDEX ((uint32_t)-1)
-
-/** The full URI for the pui:floatControl PortProtocol. */
-#define LV2_PUI_FLOAT_CONTROL_URI "http://lv2plug.in/ns/ext/pui#floatControl"
-
-/** The full URI for the pui:floatPeakRMS PortProtocol. */
-#define LV2_PUI_FLOAT_PEAK_RMS_URI "http://lv2plug.in/ns/ext/pui#floatPeakRMS"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/**
- A data type that is used to pass peak and RMS values for a period of
- audio data at an input or output port to an UI, using port_event. See the
- documentation for pui:floatPeakRMS for details about how and when this
- should be done.
-*/
-typedef struct _LV2_PUI_Peak_RMS_Data {
-
- /**
- The start of the measurement period. This is just a running counter that
- must not be interpreted as any sort of global frame position. It should
- only be interpreted relative to the starts of other measurement periods
- in port_event() calls to the same plugin instance.
-
- This counter is allowed to overflow, in which case it should just wrap
- around.
- */
- uint32_t period_start;
-
- /**
- The size of the measurement period, in the same units as period_start.
- */
- uint32_t period_size;
-
- /**
- The peak value for the measurement period. This should be the maximal
- value for abs(sample) over all the samples in the period.
- */
- float peak;
-
- /**
- The RMS value for the measurement period. This should be the root mean
- square value of the samples in the period, equivalent to
- sqrt((pow(sample1, 2) + pow(sample2, 2) + ... + pow(sampleN, 2)) / N)
- where N is period_size.
- */
- float rms;
-
-} LV2_PUI_Peak_RMS_Data;
-
-/**
- A pointer to a widget or other type of UI.
- The actual type is defined by the type of the UI defined in the RDF data.
- 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* LV2_PUI_Widget;
-
-/**
- Handle for 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 may use it to reference internal
- instance data.
-*/
-typedef void* LV2_PUI_Handle;
-
-/**
- Handle for host functions and data provided to a UI.
- An object of this type is passed to the UI's instantiate() function, and the
- UI must in turn pass it as the first parameter to the callbacks in
- LV2_PUI_Host_Descriptor. The host may use it to reference internal data, such
- as the plugin instance that the UI is associated with. The UI MUST NOT
- interpret the value of an LV2_PUI_Host_Handle in any way.
-*/
-typedef void* LV2_PUI_Host_Handle;
-
-/**
- Host-provided functions that the UI can use to control the plugin instance.
-
- A pointer to an object of this type is passed to the lv2ui_descriptor()
- function.
-
- The host MUST provide non-NULL values for all the function pointers.
-*/
-typedef struct _LV2_PUI_Host_Descriptor {
-
- /**
- Send data to one of the 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 port_protocol parameter.
-
- The @c port_protocol parameter MUST be a numeric ID for a
- pui:PortProtocol. Numeric IDs for PortProtocols are retrieved using the
- port_protocol_id() function.
-
- The @c buffer is only valid during the time of this function call, so if
- the host wants to keep it for later use it has to copy the contents to an
- internal buffer.
-
- @param host_handle The @c host_handle that was passed to the UI's
- instantiate() function.
- @param port_index The index of the port that the data should be written
- to, as returned by port_index().
- @param buffer_size The size of the data pointed to by @c buffer, in
- bytes.
- @param port_protocol The numeric ID of the Port Protocol to use,
- as returned by port_protocol_id().
- */
- void (*write_port)(LV2_PUI_Host_Handle host_handle,
- uint32_t port_index,
- uint32_t buffer_size,
- uint32_t port_protocol,
- void const* buffer);
-
- /**
- Return the numerical index for a port.
- This index is used when writing data to ports using write_port() and whe
- receiving data using port_event(). If @c port_symbol is not a valid port
- symbol for @c plugin the host it MUST return
- LV2_PUI_INVALID_PORT_INDEX. For performance reasons it may be a good idea
- to cache port indices in the UI at instantiation time.
-
- @param host_handle The LV2_PUI_Host_Handle that was passed to the UI's
- instantiate() function.
- @param port_symbol The port's symbol, as defined in the RDF data for
- the plugin.
- */
- uint32_t (*port_index)(LV2_PUI_Host_Handle host_handle,
- char const* port_symbol);
-
- /**
- Subscribe to updates for a port.
- This means that the host will call the UI's port_event() function when
- the port value changes (as defined by the PortProtocol).
-
- Calling this function with the same @c port_index and @c port_protocol
- as an already active subscription has no effect.
-
- @param host_handle The @c host_handle that was passed to the UI's
- instantiate() function.
- @param port_index The index of the port, as returned by port_index().
- @param port_protocol The numeric ID of the PortProtocol, as
- returned by port_protocol_id().
- */
- void (*subscribe_to_port)(LV2_PUI_Host_Handle host_handle,
- uint32_t port_index,
- uint32_t port_protocol,
- const LV2_Feature* const* features);
-
- /**
- Unsubscribe from updates for a port.
- This means that the host will cease calling calling port_event() when
- the port value changes.
-
- Calling this function with a @c port_index and @c port_protocol that
- does not refer to an active port subscription has no effect.
-
- @param host_handle The @c host_handle that was passed to the UI's
- instantiate() function.
- @param port_index The index of the port, as returned by port_index().
- @param port_protocol The numeric ID of the PortProtocol, as
- returned by port_protocol_id().
- */
- void (*unsubscribe_from_port)(LV2_PUI_Host_Handle host_handle,
- uint32_t port_index,
- uint32_t port_protocol,
- const LV2_Feature* const* features);
-
-
-} LV2_PUI_Host_Descriptor;
-
-/**
- This struct contains the implementation of an UI. A pointer to an
- object of this type is returned by the lv2ui_descriptor() function.
-*/
-typedef struct _LV2_PUI_Descriptor {
-
- /**
- The URI for this UI (not for the plugin it controls).
- */
- char const* 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 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 that
- references this shared object file, with trailing separator (e.g. '/').
-
- @param host_descriptor A pointer to an object that contains function
- pointers that the UI instance should use to control the plugin
- instance. This pointer MUST be valid until cleanup() is called for this
- UI instance.
-
- @param host_handle A handle that the host may use to reference internal
- data. It MUST be passed as the first parameter to the function
- pointers in @c host_descriptor, and MUST NOT be interpreted in any other
- way by the UI.
-
- @param features A NULL-terminated 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; @c features will probably not be the same array as the one the
- plugin host passes to a plugin.
- */
- LV2_PUI_Handle (*instantiate)(
- struct _LV2_PUI_Descriptor const* descriptor,
- char const* plugin_uri,
- char const* bundle_path,
- LV2_PUI_Host_Descriptor const* host_descriptor,
- LV2_PUI_Host_Handle host_handle,
- LV2_Feature const* const* features);
-
- /**
- Return the widget pointer for the UI object.
- This MUST return the same value during the entire lifetime of the UI
- object.
- */
- LV2_PUI_Widget (*get_widget)(LV2_PUI_Handle ui);
-
- /**
- Destroy the UI object and the associated widget.
- The host must not try to access the widget after calling this function.
- */
- void (*cleanup)(LV2_PUI_Handle ui);
-
- /**
- Notify the UI that something has happened to a subscribed port.
-
- This is called by the host when something happens at a plugin port that
- has been subscribed to using
- LV2_PUI_Host_Descriptor::add_port_subscription().
-
- 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.
-
- @param ui A handle for the UI object.
- @param port_index The index of the port that has changed, as returned by
- LV2_PUI_Host_Descriptor::port_index().
- @param buffer_size The size of the data buffer in bytes.
- @param port_protocol The format of the data buffer, as returned by
- LV2_PUI_Host_Descriptor::port_protocol_id().
- @param buffer A pointer to the data buffer.
- */
- void (*port_event)(LV2_PUI_Handle ui,
- uint32_t port_index,
- uint32_t buffer_size,
- uint32_t port_protocol,
- void const* buffer);
-
- /**
- Return a data structure associated with an extension URI.
-
- This facility can be used by extensions to extend the LV2_PUI_Descriptor
- API. This function adheres to the same rules as
- LV2_Descriptor::extension_data, except it applies to UIs rather than
- plugins.
- */
- void const* (*extension_data)(char const* uri);
-
-} LV2_PUI_Descriptor;
-
-typedef void* LV2_PUI_Lib_Data;
-
-/**
- Descriptor for a plugin UI library.
-
- Each plugin UI shared library has exactly one of these objects, accessed
- via the lv2_pui_lib_descriptor() function in that library.
-*/
-typedef struct {
- /**
- Opaque library data which must be passed as the first parameter to
- all the methods of this struct.
- */
- LV2_PUI_Lib_Data lib_data;
-
- void (*cleanup)(LV2_PUI_Lib_Data lib_data);
-
- /**
- Prototype for UI accessor function.
-
- This function follows the same rules as lv2_descriptor(), except it
- applies to UIs rather than plugins.
- */
- LV2_PUI_Descriptor const* (*pui_descriptor)(LV2_PUI_Lib_Data lib_data,
- uint32_t index);
-
-} LV2_PUI_Lib_Descriptor;
-
-/**
- Prototype for UI library accessor function.
-
- This is the entry point for a plugin UI 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 UIs contained in this library. The returned
- object must not be destroyed (with LV2_PUI_Lib_Descriptor::cleanup()) until
- all UIs loaded from that library have been destroyed.
-*/
-LV2_PUI_Lib_Descriptor const* lv2_pui_lib_descriptor(
- const char* bundle_path,
- LV2_Feature const* const* features);
-
-/**
- Type of the lv2_pui_lib_descriptor() function in a UI library.
-*/
-typedef LV2_PUI_Lib_Descriptor const* (*LV2_PUI_Lib_Descriptor_Func)(
- const char* bundle_path,
- LV2_Feature const* const* features);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* LV2_PUI_H */