Chapter 8 - Video Digitizer Components
This chapter discusses video digitizer components. Video digitizer components provide an interface for obtaining digitized video from an analog video source. In QuickTime, the typical client of a video digitizer component is a sequence grabber component (sequence grabber components are described in the chapter "Sequence Grabber Components" in this book). Sequence grabber components use the services of video digitizer components and image compressor components to create a simple interface for making and previewing movies. However, video digitizer components can also operate independently, placing video into a window.
This chapter has been divided into the following major sections:
- IMPORTANT
- Most applications never need to communicate directly with a video digitizer component. It is strongly advised that your application use the sequence grabber component instead; it isolates you from the myriad of details associated with video digitization.
- "About Video Digitizer Components" presents some general information about video digitizer components.
- "Using Video Digitizer Components" gives details on how you tell the digitizer where to put the data and how to control digitization. It describes a technique for improving performance.
- "Creating Video Digitizer Components" discusses how to create a video digitizer component.
- "Video Digitizer Components Reference" describes the constants, data structures, and functions associated with video digitizer components.
- "Summary of Video Digitizer Components" supplies a summary of the constants, data types, and functions associated with video digitizer components in C and in Pascal.
Chapter Contents
- About Video Digitizer Components
- Types of Video Digitizer Components
- Source Coordinate Systems
- Using Video Digitizer Components
- Specifying Destinations
- Starting and Stopping the Digitizer
- Multiple Buffering
- Obtaining an Accurate Time of Frame Capture
- Creating Video Digitizer Components
- Component Type and Subtype Values
- Required Functions
- Optional Functions
- Frame Grabbers Without Playthrough
- Frame Grabbers With Hardware Playthrough
- Key Color and Alpha Channel Devices
- Compressed Source Devices
- Video Digitizer Components Reference
- Constants
- Capability Flags
- Current Flags
- Data Types
- The Digitizer Information Structure
- The Buffer List Structure
- The Buffer Structure
- Video Digitizer Component Functions
- Getting Information About Video Digitizer Components
- Setting Source Characteristics
- Selecting an Input Source
- Setting Video Destinations
- Controlling Compressed Source Devices
- Controlling Digitization
- Controlling Color
- Controlling Analog Video
- Selectively Displaying Video
- Clipping
- Utility Functions
- Application-Defined Function
- Summary of Video Digitizer Components
- C Summary
- Constants
- Data Types
- Video Digitizer Component Functions
- Getting Information About Video Digitizer Components
- Setting Source Characteristics
- Selecting an Input Source
- Setting Video Destinations
- Controlling Compressed Source Devices
- Controlling Digitization
- Controlling Color
- Controlling Analog Video
- Selectively Displaying Video
- Clipping
- Utility Functions
- Application-Defined Function
- Pascal Summary
- Constants
- Data Types
- Video Digitizer Component Routines
- Getting Information About Video Digitizer Components
- Setting Source Characteristics
- Selecting an Input Source
- Setting Video Destinations
- Controlling Compressed Source Devices
- Controlling Digitization
- Controlling Color
- Controlling Analog Video
- Selectively Displaying Video
- Clipping
- Utility Functions
- Application-Defined Routine
- Result Codes
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