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allow QtKit capture in secondary threads

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[NSRunLoop currentRunLoop] is not the same as in the main thread.
see
https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/F
oundation/Classes/nsrunloop_Class/Reference/Reference.html
"If no input sources or timers are attached to the run loop, this
method exits immediately"

The old code caused grabFrame() to return immediately if the capture
was not done in the main thread.
This code works correctly, even in secondary threads, provided that all
capture functions are called in the *same* thread
This commit is contained in:
Frédéric Devernay 2013-07-02 18:08:12 +02:00
parent 6bf8f474fa
commit b524e275c1
1 changed files with 2 additions and 5 deletions
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7
modules/highgui/src/cap_qtkit.mm
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@ -277,11 +277,8 @@ bool CvCaptureCAM::grabFrame(double timeOut) {
double sleepTime = 0.005;
double total = 0;
NSDate *loopUntil = [NSDate dateWithTimeIntervalSinceNow:sleepTime];
while (![capture updateImage] && (total += sleepTime)<=timeOut &&
[[NSRunLoop currentRunLoop] runMode: NSDefaultRunLoopMode
beforeDate:loopUntil])
loopUntil = [NSDate dateWithTimeIntervalSinceNow:sleepTime];
while (![capture updateImage] && (total += sleepTime)<=timeOut)
usleep((int)(sleepTime*1000));
[localpool drain];