Hi,
I'm trying to implement iChat Theater capability into my garbage
collected app, and it looks to be almost working, except for a rather
all important crash. When my app is notified that it should start
sending video it executes the following code:
IMAVManager *manager = [IMAVManager sharedAVManager];
MyDocument *d;
switch ([manager state])
{
case IMAVRequested:
d = [[NSDocumentController sharedDocumentController] documentForURL:
[manager URLToShare]];
if (d == nil) {
d = [[NSDocumentController sharedDocumentController]
openDocumentWithContentsOfURL:[manager URLToShare] display:YES];
}
[manager setVideoDataSource:d.someView];
[manager start];
break;
}
someView has subviews, including a PDFView subclass. I have tried
setting the data source to the PDFView and to the PDFView's
documentView, but the result is always the same.
When I start a session the theater mode activates and I can see my
document in the iChat window. All is well until anything causes a
redraw of the view being displayed, at which point there is either a
crash, or an error that leads to a crash if I try to continue
execution. Here are the backtraces of the two types of crash:
#0 0x956bb6e8 in objc_msgSend ()
#1 0x90a2f337 in _pixelBufferReleaseCallback ()
#2 0x93079d78 in CVPixelBufferBacking::finalize ()
#3 0x9307242e in CVPixelBuffer::finalize ()
#4 0x90a21de9 in -[IMAuxVideoProvider _fillBufferFromPool:atRate:] ()
#5 0x90a21bfe in -[IMAuxVideoProvider _callbackThreadMain] ()
#6 0x95d735ad in -[NSThread main] ()
#7 0x95d73154 in __NSThread__main__ ()
#8 0x95440c55 in _pthread_start ()
#9 0x95440b12 in thread_start ()
#0 0x956b00d7 in objc_exception_throw ()
#1 0x927e844a in -[NSObject doesNotRecognizeSelector:] ()
#2 0x927e6a4c in ___forwarding___ ()
#3 0x927e6b12 in __forwarding_prep_0___ ()
#4 0x90a2f337 in _pixelBufferReleaseCallback ()
#5 0x93079d78 in CVPixelBufferBacking::finalize ()
#6 0x9307242e in CVPixelBuffer::finalize ()
#7 0x90a21de9 in -[IMAuxVideoProvider _fillBufferFromPool:atRate:] ()
#8 0x90a21bfe in -[IMAuxVideoProvider _callbackThreadMain] ()
#9 0x95d735ad in -[NSThread main] ()
#10 0x95d73154 in __NSThread__main__ ()
#11 0x95440c55 in _pthread_start ()
#12 0x95440b12 in thread_start ()
The second problem (doesNotRecognizeSelector:) I've so far only seen
once, usually there is a straight crash (bad access). This looks like
a framework bug to me, but I thought I'd ask here if anybody has any
other ideas, or similar experience to share, before filing a bug report.
-António
-----------------------------------------------------------
Some things have to be believed to be seen.
--Ralph Hodgson
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