Solved

The Audio Compression Manager

Posted on 1997-03-08
1
484 Views
Last Modified: 2012-05-04
Which DLL holds all the functions for the Audio Compression Manager? Has anyone used this with Visual Basic 4.0 to send a stream of audio to a particular device?
0
Comment
Question by:derrick030897
1 Comment
 
LVL 5

Accepted Solution

by:
volking earned 200 total points
ID: 1424553
There may be no single answer ...

MMSYSTEM.DLL       Waveform MIDI Auxiliary
MSVIDEO.DLL       Video capture, compression and decompression, rendering
MSACM.DRV       Audio compression and decompression mapper
MSACM.DLL       Compression and system management for the ACM

I don't believe there one single DLL. To quote from the MSDN:

"There are several ACM drivers which are automatically installed with the system. There are drivers which provide support for the compressed formats MS-ADPCM, IMA ADPCM, the GSM 6.10 standard, and the TrueSpeech voice coding format. There is also a PCM converter which converts between 8- and 16-bit PCM, between mono and stereo, and between different sampling frequencies. Other drivers can be installed at any time. The ACM provides API elements which allow an application to install a driver for its process only, preventing other processes from using it. "

And besides, I think you're chasing a technology that may be outdated soon. Another MSDN quote:

"The Audio Compression Manager (ACM) is included in Win32 to provide transparent run-time audio compression and decompression services. The current release of DirectSound does not support compressed wave formats; you must call ACM functions to decompress audio data before writing the data to a sound buffer.
While Microsoft will continue to support ACM, the ActiveMovie filter-based architecture is designed to provide services like compression and decompression to data streams. Look for these services in a future release of ActiveMovie."


0

Featured Post

How to improve team productivity

Quip adds documents, spreadsheets, and tasklists to your Slack experience
- Elevate ideas to Quip docs
- Share Quip docs in Slack
- Get notified of changes to your docs
- Available on iOS/Android/Desktop/Web
- Online/Offline

Join & Write a Comment

Introduction In a recent article (http://www.experts-exchange.com/A_7811-A-Better-Concatenate-Function.html) for the Excel community, I showed an improved version of the Excel Concatenate() function.  While writing that article I realized that no o…
You can of course define an array to hold data that is of a particular type like an array of Strings to hold customer names or an array of Doubles to hold customer sales, but what do you do if you want to coordinate that data? This article describes…
As developers, we are not limited to the functions provided by the VBA language. In addition, we can call the functions that are part of the Windows operating system. These functions are part of the Windows API (Application Programming Interface). U…
Get people started with the process of using Access VBA to control Outlook using automation, Microsoft Access can control other applications. An example is the ability to programmatically talk to Microsoft Outlook. Using automation, an Access applic…

708 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

20 Experts available now in Live!

Get 1:1 Help Now