Glossary

• attachment  

  A Core Foundation object associated with a video frame. This attachment, specified by a key-value pair, can hold any sort of information relevant to the frame, such as timestamp.



• buffer pool  

  A collection of preallocated buffers that can be used over and over. Keeping a pool of buffers available requires less overhead than allocating and deallocating a buffer each time it is needed.



• display link  

  A high-priority thread that, based on a specified hardware display, makes intelligent guesses as to how often frames must be output to synchronize with the display’s refresh rate.



• image buffer  

  An abstract buffer type that holds Core Video images. Pixel buffers, Core Video OpenGL buffers, and OpenGL textures derive from the CVImageBuffer type.



• OpenGL buffer  

  A buffer that holds image information in graphics card memory. In Core Video, you manipulate OpenGL buffers using the CVOpenGLBufferRef type, which is a wrapper around the standard OpenGL buffer type.



• OpenGL texture  

  An immutable image that OpenGL uses to wrap onto primitives. In Core Video, you manipulate OpenGL textures using the CVOpenGLTextureRef type, which is a wrapper around the standard OpenGL texture type.



• pixel buffer  

  A buffer that holds image information in main memory.



• pool  

  See buffer pool.



• texture  

  See OpenGL texture.



• texture cache  

  A pool of OpenGL textures.



• visual context  

  An abstract space that indicates where drawing should occur. For example, an OpenGL context specifies where OpenGL drawing should occur. A visual context is typically associated with an NSView or HIView object.