diff options
Diffstat (limited to 'ext/contexts.lv2/contexts.ttl')
| -rw-r--r-- | ext/contexts.lv2/contexts.ttl | 52 |
1 files changed, 26 insertions, 26 deletions
diff --git a/ext/contexts.lv2/contexts.ttl b/ext/contexts.lv2/contexts.ttl index ad37d95..187acd0 100644 --- a/ext/contexts.lv2/contexts.ttl +++ b/ext/contexts.lv2/contexts.ttl @@ -35,32 +35,32 @@ a lv2:Specification ; a lv2:Feature ; doap:name "LV2 Contexts" ; - rdfs:comment """ -An extension for LV2 plugins which have several execution contexts. + lv2:documentation """ +<p>An extension for LV2 plugins which have several execution contexts.</p> -Contexts allow plugins to run several tasks in parallel and process port +<p>Contexts allow plugins to run several tasks in parallel and process port input/output in multiple threads. Contexts can be used to add non-realtime functionality to a plugin while still keeping the audio run() method -realtime safe. +realtime safe.</p> -Any host which supports this extension must pass an LV2_Feature to +<p>Any host which supports this extension must pass an LV2_Feature to the plugin's instantiate method with URI http://lv2plug.in/ns/ext/contexts -and a pointer to a +and a pointer to a</p> <pre> struct { void* host_handle; void (*request_run)(void* host_handle, const char* context_uri); } </pre> -where the plugin may call request_run with the given host_handle (from any -context) to demand immediate execution of the context specified. +<p>where the plugin may call request_run with the given host_handle (from any +context) to demand immediate execution of the context specified.</p> -If the host does not support blocking contexts, request_run may be set to NULL, -but plugins which have a :BlockingContext which is :mandatory MUST NOT be -instantiated. If the plugin has ANY context which is :hardRTCapable, -request_run must be realtime safe (as defined by lv2:hardRTCapable). +<p>If the host does not support blocking contexts, request_run may be set to +NULL, but plugins which have a :BlockingContext which is :mandatory MUST NOT +be instantiated. If the plugin has ANY context which is :hardRTCapable, +request_run must be realtime safe (as defined by lv2:hardRTCapable).</p> -Unless otherwise stated, each context (defined by some URI) adds a new +<p>Unless otherwise stated, each context (defined by some URI) adds a new threading class similar to the Audio class defined by LV2. Each context has a run callback and a connect_port callback both in the same class (i.e. can't be called concurrently), but may be called concurrently with functions for other @@ -68,8 +68,8 @@ contexts (excluding the Instantiation class). Context properties such as ctx:hardRTCapable apply to both functions. The host MUST only call the correct connect_port function associated with the context for that port, i.e. it is an error to use the main LV2 connect_port -function on a port with a context other than the main LV2 run function. -"""^^lv2:basicXHTML . +function on a port with a context other than the main LV2 run function.</p> +""" . ########################## @@ -78,21 +78,21 @@ function on a port with a context other than the main LV2 run function. ctx:Context a rdfs:Class ; rdfs:label "LV2 Context" ; - rdfs:comment """ -A potentially concurrent context (callback) on a plugin. + lv2:documentation """ +<p>A potentially concurrent context (callback) on a plugin.</p> -Ports are always associated with a context. If a port has no explicit context -property, then its context is ctx:AudioContext (the default LV2 run() context). +<p>Ports are always associated with a context. If a port has no explicit context +property, then its context is ctx:AudioContext (the default LV2 run() context).</p> -A plugin indicates support for a context by supporting an LV2 Feature with +<p>A plugin indicates support for a context by supporting an LV2 Feature with that context's URI. If a plugin optionally supports a context (e.g. <code><plugin> lv2:optionalFeature ctx:IdleContext .</code>), then all ports associated with that context MUST be lv2:connectionOptional. Thus, hosts that do not support contexts will connect such ports to NULL and the -plugin can run with only a standard LV2 run() context. +plugin can run with only a standard LV2 run() context.</p> -Any plugin that supports any context (optionally or mandatorily) MUST adhere -to the following additional threading rules for LV2_Descriptor.connect_port: +<p>Any plugin that supports any context (optionally or mandatorily) MUST adhere +to the following additional threading rules for LV2_Descriptor.connect_port:</p> <ul> <li>connect_port MUST only be called for a given port from the context associated with that port</li> @@ -100,16 +100,16 @@ associated with that port</li> contexts (but MUST NOT be called concurrently for multiple ports in the same context)</li> </ul> -Note this implies that any shared data access in connect_port may be +<p>Note this implies that any shared data access in connect_port may be accessed concurrently. The plugin is responsible for any synchronisation -or locking necessary to make this possible. +or locking necessary to make this possible.</p> """ . ctx:AudioContext a ctx:Context , lv2:Feature ; rdfs:comment """The context of LV2_Descriptor.run().""" . ctx:MessageContext a ctx:Context , lv2:Feature ; - rdfs:comment """ + lv2:documentation """ A non-realtime context for plugin control via message passing. This context has a run method which takes a bitset of flags for parameters specifying which input and output ports are valid before and after the run method has executed, |