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Add LV2 option/extension for plugin thread sched priority

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This allows plugins that need threads to process to configure their
thread priority to not interfere with the host's process threads.
This commit is contained in:
Robin Gareus 2018-12-18 13:30:31 +01:00
parent 0d55dad045
commit 0a3fc4a87f
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1 changed files with 7 additions and 0 deletions
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7
libs/ardour/lv2_plugin.cc
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@ -37,6 +37,7 @@
#include "pbd/compose.h"
#include "pbd/error.h"
#include "pbd/locale_guard.h"
#include "pbd/pthread_utils.h"
#include "pbd/replace_all.h"
#include "pbd/xml++.h"
@ -495,6 +496,8 @@ LV2Plugin::init(const void* c_plugin, samplecnt_t rate)
LV2_URID atom_Int = _uri_map.uri_to_id(LV2_ATOM__Int);
static const int32_t _min_block_length = 1; // may happen during split-cycles
static const int32_t _max_block_length = 8192; // max possible (with all engines and during export)
static const int32_t rt_policy = PBD_SCHED_FIFO;
static const int32_t rt_priority = pbd_absolute_rt_priority (PBD_SCHED_FIFO, AudioEngine::instance()->client_real_time_priority () - 2);
/* Consider updating max-block-size whenever the buffersize changes.
* It requires re-instantiating the plugin (which is a non-realtime operation),
* so it should be done lightly and only for plugins that require it.
@ -511,6 +514,10 @@ LV2Plugin::init(const void* c_plugin, samplecnt_t rate)
sizeof(int32_t), atom_Int, &_seq_size },
{ LV2_OPTIONS_INSTANCE, 0, _uri_map.uri_to_id("http://lv2plug.in/ns/ext/buf-size#nominalBlockLength"),
sizeof(int32_t), atom_Int, &_impl->block_length },
{ LV2_OPTIONS_INSTANCE, 0, _uri_map.uri_to_id("http://ardour.org/lv2/threads/#schedPolicy"),
sizeof(int32_t), atom_Int, &rt_policy },
{ LV2_OPTIONS_INSTANCE, 0, _uri_map.uri_to_id("http://ardour.org/lv2/threads/#schedPriority"),
sizeof(int32_t), atom_Int, &rt_priority },
{ LV2_OPTIONS_INSTANCE, 0, 0, 0, 0, NULL }
};