Inside Macintosh: QuickTime Components

Request Types

This section describes the request types used by two standard dialog component functions that allow you to work with the current compression settings for an image or a sequence of images. (You can establish these settings in a number of ways; see "Setting Default Parameters" for more information about your options.)

You use the SCGetInfo function to retrieve settings information. The SCSetInfo function (described on SCSetInfo ) enables you to modify the settings.

These functions can work with a number of different types of settings information. When you call either function, you specify the type of data you want to work with. The following request types are defined:



 
#define     scSpatialSettingsType           'sptl'      /* spatial options */

#define     scTemporalSettingsType          'tprl'      /* temporal options */

#define     scDataRateSettingsType          'drat'      /* data rate */

#define     scColorTableType                'clut'      /* color table */

#define     scProgressProcType              'prog'      /* progress function */

#define     scExtendedProcsType             'xprc'      /* extended dialog */

#define     scPreferenceFlagsType           'pref'      /* preferences */

#define     scSettingsStateType             'ssta'      /* all settings */

#define     scSequenceIDType                'sequ'      /* sequence ID */

#define     scWindowPositionType            'wndw'      /* window position */

#define     scCodecFlagsType                'cflg'      /* compression flags */

Each of these request types requires different parameter data. The following sections discuss each of these request types and their data requirements.

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