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Cancel overlay update callbacks before destroying VTRenderer

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This commit is contained in:
Cameron Gutman 2022-10-14 22:49:33 -05:00
parent 02c781b8f4
commit 125738f13d
1 changed files with 14 additions and 24 deletions
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38
app/streaming/video/ffmpeg-renderers/vt.mm
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@ -46,10 +46,22 @@ public:
m_VsyncPassed(nullptr)
{
SDL_zero(m_OverlayTextFields);
for (int i = 0; i < Overlay::OverlayMax; i++) {
m_OverlayUpdateBlocks[i] = dispatch_block_create(DISPATCH_BLOCK_DETACHED, ^{
updateOverlayOnMainThread((Overlay::OverlayType)i);
});
}
}
virtual ~VTRenderer() override
{
// We may have overlay update blocks enqueued for execution.
// We must cancel those to avoid a UAF.
for (int i = 0; i < Overlay::OverlayMax; i++) {
dispatch_block_cancel(m_OverlayUpdateBlocks[i]);
Block_release(m_OverlayUpdateBlocks[i]);
}
if (m_DisplayLink != nullptr) {
CVDisplayLinkStop(m_DisplayLink);
CVDisplayLinkRelease(m_DisplayLink);
@ -453,34 +465,11 @@ public:
[m_OverlayTextFields[type] setHidden: !Session::get()->getOverlayManager().isOverlayEnabled(type)];
}
static void updateDebugOverlayOnMainThread(void* context)
{
VTRenderer* me = (VTRenderer*)context;
me->updateOverlayOnMainThread(Overlay::OverlayDebug);
}
static void updateStatusOverlayOnMainThread(void* context)
{
VTRenderer* me = (VTRenderer*)context;
me->updateOverlayOnMainThread(Overlay::OverlayStatusUpdate);
}
virtual void notifyOverlayUpdated(Overlay::OverlayType type) override
{
// We must do the actual UI updates on the main thread, so queue an
// async callback on the main thread via GCD to do the UI update.
switch (type) {
case Overlay::OverlayDebug:
dispatch_async_f(dispatch_get_main_queue(), this, updateDebugOverlayOnMainThread);
break;
case Overlay::OverlayStatusUpdate:
dispatch_async_f(dispatch_get_main_queue(), this, updateStatusOverlayOnMainThread);
break;
default:
break;
}
dispatch_async(dispatch_get_main_queue(), m_OverlayUpdateBlocks[type]);
}
virtual bool prepareDecoderContext(AVCodecContext* context, AVDictionary**) override
@ -524,6 +513,7 @@ private:
AVSampleBufferDisplayLayer* m_DisplayLayer;
CMVideoFormatDescriptionRef m_FormatDesc;
NSView* m_StreamView;
dispatch_block_t m_OverlayUpdateBlocks[Overlay::OverlayMax];
NSTextField* m_OverlayTextFields[Overlay::OverlayMax];
CVDisplayLinkRef m_DisplayLink;
int m_LastColorSpace;