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Re: reading 10 bit uncompressed 4:2:2 QuickTimes?

Subject: Re: reading 10 bit uncompressed 4:2:2 QuickTimes?
From: Andreas Wittenstein <email@hidden>
Date: Tue, 16 Aug 2005 11:03:24 -0700
Delivered-to: email@hidden
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Paul,

To determine the actual precision of a pixel, use 'ICMGetPixelFormatInfo()' and look at the 'bitsPerPixel' field of the 'ICMPixelFormatInfo'.
Currently I am not using any of the ICM functions. Do you have any pointers to sample code on how to call ICMGetPixelFormatInfo?

Here's some code that calls 'ICMGetPixelFormatInfo()' for 'k64ARGBPixelFormat'. Note that QuickTime still doesn't yet set the 'cmpCount' and 'cmpSize' for any of its built-in pixel formats, and that it only bothers to set the 'horizontalSubsampling' and 'verticalSubsampling' fields for pixel formats whose components are nonuniformly sampled.

OSErr lError = noErr; long lQuickTimeVersion; OSType lPixelFormat = k64ARGBPixelFormat; ICMPixelFormatInfo lPixelFormatInfo; Gestalt(gestaltQuickTimeVersion, &lQuickTimeVersion); lPixelFormatInfo.size = sizeof(ICMPixelFormatInfo); lError = ICMGetPixelFormatInfo(lPixelFormat, &lPixelFormatInfo); if (!lError){ unsigned int lPlaneIndex = 0; printf("Pixel format '%c%c%c%c' (0x%08X)\n", lPixelFormat>>24, lPixelFormat>>16, lPixelFormat>>8, lPixelFormat, lPixelFormat); printf("\tformatFlags 0x%08X\n", lPixelFormatInfo.formatFlags); printf("\tdefaultGammaLevel %x\n", lPixelFormatInfo.defaultGammaLevel); if (lQuickTimeVersion>0x06500000){ printf("\tcmpCount %d\n", lPixelFormatInfo.cmpCount); printf("\tcmpSize %d\n", lPixelFormatInfo.cmpSize); } for (lPlaneIndex=0; lPixelFormatInfo.bitsPerPixel [lPlaneIndex]; lPlaneIndex++){ printf("\tplane %d:\n", lPlaneIndex); printf("\t\tbitsPerPixel %d\n", lPixelFormatInfo.bitsPerPixel[lPlaneIndex]); if (lQuickTimeVersion>0x06000000){ printf("\t\thorizontalSubsampling %d\n", lPixelFormatInfo.horizontalSubsampling[lPlaneIndex]); printf("\t\tverticalSubsampling %d\n", lPixelFormatInfo.verticalSubsampling[lPlaneIndex]); } } }

Andreas Wittenstein
BitJazz Inc.
http://www.bitjazz.com/sheervideo/

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	>Re: reading 10 bit uncompressed 4:2:2 QuickTimes? (From: Andreas Wittenstein <email@hidden>)
	>Re: reading 10 bit uncompressed 4:2:2 QuickTimes? (From: Paul Miller <email@hidden>)

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