Audio Compression Manager Functions and Structures
The ACM functions fall into several categories. Naming conventions for the
functions make it easy to identify these categories. Function names (with two
exceptions) are of the form
acmGroupFunction, where
Group designates the ACM category (such as "Driver," "Format," "FormatTag,"
"Filter," "FilterTag," or "Stream"), and
Function describes the action performed by the function.
The functions in the filter and format groups are very similar. Almost every
function that acts on filters has a parallel function that acts on formats.
In the format group, some functions use waveform-audio format tags (the
wFormatTag member of a
WAVEFORMATEX structure) while others require full waveform-audio formats (the full
WAVEFORMATEX structure). (For reference information about the
WAVEFORMATEX structure, see
Error.)
In the filter group, some functions use waveform-audio filter tags (the
dwFilterTag member of a
WAVEFILTER structure), while others require full waveform-audio filters (the full
WAVEFILTER structure).
The functions in the stream group represent the many steps involved in a
conversion: opening a conversion instance, preparing for the conversion, performing
the conversion, cleaning up after the conversion is complete, and closing the
conversion instance.
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