Imaadpcm

[This is preliminary documentation and subject to change.]

SUMMARY

Each of the three samples Msfilter, Msgsm610 and Imaadpcm illustrates an implementation of an Audio Compression Manager (ACM) software codec. This sample in particular contains encode and decode routines for the IMA's ADPCM format. This format is the same format used in Intel's DVI standard. Intel has made this algorithm public domain and the IMA has endorsed this format as a standard for audio compression. The sample works on both x86 and Alpha platforms. It is 64-bit compliant, but requires the addition of 64-bit headers before compilation. It builds properly with Microsoft® Visual C® 6.0. The sample does not support Plug and Play, Power Management, or On Now. These features are not applicable to ACM software codecs.

BUILDING THE SAMPLE

Type build in the sample directory. A successful build produces the file Imaadp32.acm.

CODE TOUR

File Manifest

File		Description

Codec.c		ACM driver interfaces
Codec.h		header file for Codec.c
Codec.rc	string and dialog resources
Codec.rcv	version resource
Config.c	configuration dialog
Debug.c		debug utilities
Debug.h		header file for Debug.c
Imaadpcm.c	the codec algorithm
Imaadpcm.h	header file for Gsm610.c
Muldiv32.h	math helper macros
Imaadpcm.def	module definition file for linker
Oemsetup.inf	sample installation file for the driver


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