Inside Macintosh: QuickTime Components /

Chapter 6 - Sequence Grabber Channel Components / Sequence Grabber Channel Components Reference

Functions / Configuration Functions for Video Channel Components

SGGetVideoCompressorType

The SGGetVideoCompressorType function allows the sequence grabber component to determine the type of image compression that is being applied to your channel's
video data.

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

c

Identifies the channel connection for this operation.

compressorType

Contains a pointer to an OSType field that is to receive information about the type of image compression to use. Return a value that corresponds to one of the image-compression 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. If this value is set to 0, its default compression type is selected.

SEE ALSO

The sequence grabber component can set the image-compression type by calling the SGSetVideoCompressorType function, which is described in the previous section.

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