diff options
Diffstat (limited to 'ext/pui.lv2')
| -rw-r--r-- | ext/pui.lv2/pui.h | 199 |
1 files changed, 91 insertions, 108 deletions
diff --git a/ext/pui.lv2/pui.h b/ext/pui.lv2/pui.h index f6ec303..9dbe8db 100644 --- a/ext/pui.lv2/pui.h +++ b/ext/pui.lv2/pui.h @@ -3,10 +3,10 @@ * 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, + * Copyright (C) 2000-2002 Richard W.E. Furse, Paul Barton-Davis, * Stefan Westerfeld * Copyright (C) 2006 Steve Harris, David Robillard. * @@ -32,7 +32,7 @@ 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(). */ @@ -48,10 +48,6 @@ invalid port symbols. */ #define LV2_PUI_INVALID_PORT_INDEX ((uint32_t)-1) -/** The numerical ID returned by LV2_PUI_Host_Descriptor::port_protocol_id() for - invalid or unsupported PortProtocols. */ -#define LV2_PUI_INVALID_PORT_PROTOCOL_ID 0 - /** The full URI for the pui:floatControl PortProtocol. */ #define LV2_PUI_FLOAT_CONTROL_URI "http://lv2plug.in/ns/ext/pui#floatControl" @@ -62,43 +58,43 @@ 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; + + /** + 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; @@ -131,7 +127,7 @@ 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. @@ -142,23 +138,23 @@ typedef struct _LV2_PUI_Host_Descriptor { /** Send data to one of the plugin's input ports. - The @a buffer parameter MUST point to a block of data @a buffer_size + 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 @a port_protocol parameter. - - The @a port_protocol parameter MUST be a numeric ID for a - pui:PortProtocol. Numeric IDs for PortProtocols are retrieved using the + 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 @a buffer is only valid during the time of this function call, so if + 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 @a host_handle that was passed to the UI's + + @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 @a buffer, in + @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(). @@ -168,122 +164,109 @@ typedef struct _LV2_PUI_Host_Descriptor { 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 @a port_symbol is not a valid port - symbol for @a plugin the host it MUST return + 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 + + @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); - - /** - This function is used by the UI, typically at instantiation, to get - the numeric IDs that are mapped to certain pui:PortProtocols (see - pui.ttl for details). If the host does not support the given - pui:PortProtocol it MUST return LV2_PUI_INVALID_PORT_PROTOCOL_ID, - but the UI SHOULD not rely on this to find out which protocols - are supported, it should check the @a features array passed to - instantiate() for this. - - @param host_handle The @a host_handle that was passed to the UI's - instantiate() function. - @param port_protocol_uri The URI of the pui:PortProtocol. - */ - uint32_t (*port_protocol_id)(LV2_PUI_Host_Handle host_handle, - char const* port_protocol_uri); - + /** 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 @a port_index and @a port_protocol + + 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 @a host_handle that was passed to the UI's + + @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 (*add_port_subscription)(LV2_PUI_Host_Handle host_handle, - uint32_t port_index, - uint32_t port_protocol); + void (*subscribe_to_port)(LV2_PUI_Host_Handle host_handle, + uint32_t port_index, + uint32_t port_protocol, + const LV2_Feature* const* features); /** - Unsubscribe to updates for a port. + 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 @a port_index and @a port_protocol that + + 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 @a host_handle that was passed to the UI's + + @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 (*remove_port_subscription)(LV2_PUI_Host_Handle host_handle, - uint32_t port_index, - uint32_t port_protocol); - + 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. + 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 @a host_descriptor, and MUST NOT be interpreted in any other + 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; @a features will probably not be the same array as the one the + 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); + 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. @@ -297,18 +280,18 @@ typedef struct _LV2_PUI_Descriptor { 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 @a buffer is only valid during the time of this function call, so if + + 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(). @@ -322,7 +305,7 @@ typedef struct _LV2_PUI_Descriptor { uint32_t buffer_size, uint32_t port_protocol, void const* buffer); - + /** Return a data structure associated with an extension URI. |