Inside Macintosh: QuickTime Components /

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

Functions / Configuration Functions for Video Channel Components

SGSetVideoCompressorType

The SGSetVideoCompressorType function allows the sequence grabber component to specify the type of image compression your component is to apply to the captured video images.

pascal ComponentResult SGSetVideoCompressorType (SGChannel c, 
                                          OSType compressorType);

c

Identifies the channel connection for this operation.

compressorType

Specifies the type of image compression to use. The value of this parameter 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. If this value is set to 0, its default compression type is selected.

DESCRIPTION

In addition, your component should reset all image-compression parameters
to their default values. The sequence grabber component can then use the SGSetVideoCompressor function, described on page 6-65, to change those compression parameters.

RESULT CODES

cantDoThatInCurrentMode	-9402	Request invalid in current mode
notEnoughMemoryToGrab	-9403	Insufficient memory for record operation
deviceCantMeetRequest	-9408	Device cannot support grabber

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