This file contains information about the implementation of the
multimedia layer of Wine.
The implementation can be found in the
dlls/winmm/ directory (and in many of its
subdirectories), but also in dlls/msacm/
(for the audio compression/decompression manager) and
dlls/msvideo/ (for the video
compression/decompression manager).
The multimedia stuff is split into 3 layers. The low level (device
drivers), mid level (MCI commands) and high level abstraction layers.
The low level layer has also some helper DLLs (like the MSACM/MSACM32
and MSVIDEO/MSVFW32 pairs).
All of those components are defined as DLLs (one by one).
The low level layer may depend on current hardware and OS services
(like OSS on Unix). It provides the core of playback/record
using fine grain objects (audio/midi streams...).
Mid level (MCI) and high level layers must be written independently from
the hardware and OS services.
MCI level provides some coarser grain operations (like playing
a Midi file, or playing a video stream).
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