Inside Macintosh: QuickTime Components /

Chapter 5 - Sequence Grabber Components / Sequence Grabber Components Reference

Sequence Grabber Component Functions / Working With Video Channels

SGGetVideoCompressorType

The SGGetVideoCompressorType function allows you to determine the type of image compression that is being applied to a channel's video data.

pascal ComponentResult SGGetVideoCompressorType (SGChannel c,
                                        OSType *compressorType);

c

Specifies the reference that identifies the channel for this operation. You obtain this reference from the SGNewChannel function, described on page 5-29.

compressorType

Contains a pointer to an OSType field that is to receive information about the type of image compression to use. The returned value must correspond to one of the image compressor types supported by the Image Compression Manager. Currently, six CodecType values are provided by Apple. You should use the GetCodecNameList function to retrieve these names, so that your application can take advantage of new compressor types that may be added in the future. For each CodecType value in the following list, the corresponding compression method is also identified by its text string name.

	Compressor type	Compressor name
	'rpza'	video compressor
	'jpeg'	photo compressor
	'rle '	animation compressor
	'raw '	raw compressor
	'smc '	graphics compressor
	'cvid'	compact video compressor

See the chapter "Image Compression Manager" in Inside Macintosh: QuickTime for information about valid compressor types.

SEE ALSO

You can set the image-compression type by calling the SGSetVideoCompressorType function, which is described in the previous section.

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