You guessed it right and my first approach was to develop a provider but QC was raising an exception whenever it called the outputImageProvider... function. I got overwhelmed and decided to choose an easier approach, but yes you are right I should follow the right approach.
Another reason for switching to consumer was the input image pixel format which is 2yuv... (from decklink) and the QCPlugin supports RGBA type formats and I don't have a clue how to make the conversion. I also saw your movieloader patch and its code which can be a great help so will try again tomorrow. Thanks Nisar *** This Message Has Been Sent Using BlackBerry Internet Service from Mobilink *** -----Original Message----- From: vade <dokt...@me.com> Date: Wed, 05 Oct 2011 15:44:11 To: Nisar Ahmed<nisar....@gmail.com> Cc: Christopher Wright<christopher_wri...@apple.com>; quartzcomposer-dev list list<quartzcomposer-dev@lists.apple.com> Subject: Re: Drawing inside QC Plugin using CIContext It looks like you are outputting an image from a decklink card (I am assuming this is going to be for a digitizer / video input replacement?) Assuming my assumption is correct, why not output the CVPIxelBufferRef ? It looks like you create one from the decklink IDeckLinkVideoInputFrame handler in your decklink callback, and make the patch be a provider, rather than a consumer and use the factory method outputImageProviderFromBufferWithPixelFormat:pixelsWide:pixelsHigh:baseAddress:bytesPerRow:releaseCallback:releaseContext:colorSpace:shouldColorMatch, or a custom QCPLuginOutputImageProvider class you implement and just output an image :) QC will handle everything else you need and you can additionally use image filters, CI Filters and GLSL shaders on your output image. On Oct 5, 2011, at 12:08 PM, Nisar Ahmed wrote: > Yes you are correct, I added this and it worked but..... > > //Creating image from a CVImageBufferRef > (Format=PAL) > image = [[CIImage alloc] initWithCVImageBuffer:pixelBuffer]; > > //Resizing width and height of image to match input port's > width and height > width = [image extent].size.width*(self.inputWidth/2.0); > height = [image extent].size.height*(self.inputHeight/2.0); > > glViewport(self.inputX, self.inputY, width, height); > glMatrixMode(GL_MODELVIEW); > glLoadIdentity(); > > glMatrixMode(GL_PROJECTION); > glLoadIdentity(); > glOrtho(0, width, 0, height, -1.0, 1.0); > [ciContext drawImage:image inRect:CGRectMake(0, 0, width, > height) fromRect:[image extent]]; > > Now I can see correct image inside. BUT the whole of QC View background is > painted in White and it's no more transparent like in other consumer patches. > The image in question is in PAL format. > > I have also attached a screen shot for reference > > Thank you > Nisar > > > > On Wed, Oct 5, 2011 at 8:27 PM, Christopher Wright > <christopher_wri...@apple.com> wrote: >> Now I am a little confused about inRect and fromRect parameters of drawImage >> since the coordinate system is different and which OpenGL function should I >> include or remove from this function for it to work. >> >> I can only see a blank screen on top right corner of QC View > > You'll probably want to change the Projection matrix, since QC will have it > set to something you probably aren't interested in. > > -- > Christopher Wright > christopher_wri...@apple.com > > > <Screen shot 2011-10-05 at 9.07.16 PM.png> > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Quartzcomposer-dev mailing list (Quartzcomposer-dev@lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/quartzcomposer-dev/doktorp%40mac.com > > This email sent to dokt...@mac.com
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