Hi list ! In my application I display still images and videos.For best performances, I use a display link and also Apple's plugin FastImage.
For images everything is just fine.For movies I was considering if it could bring any performance enhancement to pass the video frames to a FastImage plugin instead of an Image input port.
I used to pass my movie frames like this :
//Check if a new frame is available from the movie
if(QTVisualContextIsNewImageAvailable(qtVisualContext, time)) {
CVOpenGLTextureRef texture = NULL;
if( QTVisualContextCopyImageForTime(qtVisualContext, nil, time,
&texture) == noErr ){ // get the texture for the frame
// the above call may produce a null texture so we must check for
this first
if(texture != NULL){
//Pass updated movie frames cache to the
composition
if(![renderer setValue:(id)texture
forInputKey:kVideoImageInputKey])
NSLog(@"[Area %...@] Could not pass frames cache to composition",
areaId);
}
}
CVOpenGLTextureRelease(texture);
}
I changed it to the following :
//Check if a new frame is available from the movie
if(QTVisualContextIsNewImageAvailable(qtVisualContext, time)) {
CVOpenGLTextureRef texture = NULL;
if( QTVisualContextCopyImageForTime(qtVisualContext, nil, time,
&texture) == noErr ){ // get the texture for the frame
// the above call may produce a null texture so we must check for
this first
if(texture != NULL){
NSMutableDictionary* arguments =
[NSMutableDictionary dictionary];
[arguments setObject:[NSNumber
numberWithUnsignedInt:CVOpenGLTextureGetName(texture)]
forKey:kArgumentKey_TextureName];
[arguments setObject:[NSNumber numberWithUnsignedInt:areaWidth]
forKey:kArgumentKey_TextureWidth];
[arguments setObject:[NSNumber numberWithUnsignedInt:areaHeight]
forKey:kArgumentKey_TextureHeight];
#if __BIG_ENDIAN__
[arguments setObject:QCPlugInPixelFormatARGB8
forKey:kArgumentKey_TextureFormat];
#else
[arguments setObject:QCPlugInPixelFormatBGRA8
forKey:kArgumentKey_TextureFormat];
#endif
[arguments setObject:(id)_textureColorSpace
forKey:kArgumentKey_TextureColorSpace];
return arguments;
}
}
return nil;
}
return nil;
I also modified the FastImage plugin to have it keep displaying the
old frame if there is no new one.
Unfortunately instead of having a performance improvement I had a
performance drop (and a KP).
Am I going in the right direction? Is there any performance improvement possible? Am I leaking somewhere (I guess that's why I had a kernel panic) Thanks in advance Fabrice Pipart www.easyshadow.com EasyMediaOnline Digital Signage Software AIM : fabricepipart Skype: fabrice.pipart Tel. (877)-ESIGN-4U ext 69 Int. +1-(877)-374-4648 Fax +1-(877) 298-5108
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