Writing Streams to a File
You can also create a file containing data streams by writing a new data
stream to a file.
You can create a new stream in a new or existing file by using the
AVIFileCreateStream function. This function defines a new stream according to the characteristics
described in an
AVISTREAMINFO structure, creates a stream interface for the new stream, increments the
reference count of the stream, and returns the address of the stream-interface
pointer.
Before you write the content of the stream, you must specify the stream
format. You can set the stream format by using the
AVIStreamSetFormat function. When setting the format of a video stream, you must supply this
function with a
BITMAPINFO structure containing the appropriate information. When setting the format of
an audio stream, you must supply a
WAVEFORMAT or
WAVEFORMATEX structure containing the appropriate information. The information you need to
supply to the function for other stream types depends on the stream type and
the stream handler.
You can write the multimedia content in a stream by using the
AVIStreamWrite function. This function copies raw data from an application-supplied buffer
into the specified stream. The default AVI file handler appends information to
the end of a stream. The default WAVE handler can write waveform-audio data
within a stream as well as at the end of a stream.
You can write supplementary information about the file or stream that is not
included in the
AVIFileCreateStream or
AVIStreamSetFormat function by using the
AVIFileWriteData and
AVIStreamWriteData functions. You can record data that is applicable to the entire file, such as
copyright information and modification history, by using
AVIFileWriteData. You can record stream-specific information, such as compression and
decompression settings, by using
AVIStreamWriteData. The supplementary information is stored in separate chunks within the file.
You can close the stream after you finish writing to the new stream by using
the
AVIStreamRelease function. This function clears buffers used in recording the stream data, and
it completes and closes any incomplete data chunks in the file.
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