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[obs] scheduler: release ownership when source is idle

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Renew frame scheduling only while the source is active and OBS is
delivering video ticks. Release ownership after deactivation or a stale
tick stream.

Reacquire with a new generation and an immediate frame when ticking
resumes.
This commit is contained in:
Geoffrey McRae
2026-08-06 16:39:11 +10:00
parent 903a8efe75
commit 2ac49b6487
3 changed files with 95 additions and 15 deletions
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28
obs/lg.c
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@@ -135,6 +135,7 @@ typedef struct
bool frameSerialValid;
pthread_mutex_t pointerLock;
LGFrameScheduler frameScheduler;
_Atomic(bool) sourceActive;
bool cursorMono;
gs_texture_t * cursorTex;
@@ -437,6 +438,7 @@ static void * lgCreate(obs_data_t * settings, obs_source_t * context)
atomic_store(&this->cursorVer, 0);
atomic_store(&this->cursorTransformVer, 0);
atomic_store(&this->sdrWhiteLevel, KVMFR_SDR_WHITE_LEVEL_DEFAULT);
atomic_store(&this->sourceActive, obs_source_active(context));
lgUpdate(this, settings);
return this;
}
@@ -723,6 +725,8 @@ static void * frameThread(void * data)
}
pthread_mutex_lock(&this->pointerLock);
lgFrameSchedulerSetActive(&this->frameScheduler,
atomic_load_explicit(&this->sourceActive, memory_order_acquire));
lgFrameSchedulerUpdate(&this->frameScheduler,
this->pointerQueue, now);
pthread_mutex_unlock(&this->pointerLock);
@@ -970,7 +974,6 @@ static void lgUpdate(void * data, obs_data_t * settings)
lgFrameSchedulerInit(&this->frameScheduler,
udata->features & KVMFR_FEATURE_FRAME_SCHEDULE, clientID);
lgFrameSchedulerSetPeriod(&this->frameScheduler, lgFramePeriod());
this->state = STATE_STARTING;
createThreads(this);
@@ -1443,7 +1446,12 @@ static void lgVideoTick(void * data, float seconds)
return;
}
lgFrameSchedulerSetPeriod(&this->frameScheduler, framePeriod);
const bool sourceActive = atomic_load_explicit(
&this->sourceActive, memory_order_acquire);
lgFrameSchedulerSetActive(&this->frameScheduler, sourceActive);
if (sourceActive)
lgFrameSchedulerSetPeriod(
&this->frameScheduler, framePeriod, tickTime);
this->cursorRect.x = this->cursor.x;
this->cursorRect.y = this->cursor.y;
@@ -1724,6 +1732,20 @@ static void lgVideoTick(void * data, float seconds)
obs_leave_graphics();
}
static void lgActivate(void * data)
{
LGPlugin * this = (LGPlugin *)data;
atomic_store_explicit(
&this->sourceActive, true, memory_order_release);
}
static void lgDeactivate(void * data)
{
LGPlugin * this = (LGPlugin *)data;
atomic_store_explicit(
&this->sourceActive, false, memory_order_release);
}
static void lgSetupCursorEffect(LGPlugin * this, int outputTransfer)
{
const KVMFRColorTransform * transform = &this->activeCursorTransform;
@@ -1916,6 +1938,8 @@ struct obs_source_info lg_source =
.update = lgUpdate,
.get_defaults = lgGetDefaults,
.get_properties = lgGetProperties,
.activate = lgActivate,
.deactivate = lgDeactivate,
.video_tick = lgVideoTick,
.video_render = lgVideoRender,
#if LIBOBS_API_MAJOR_VER >= 28