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Sample Code for using ACM to convert a WAV file

Posted on 1997-06-30
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Can someone give me a sample code in C++ that is easy to read and understand on using ACM (Audio Compression Manager) to convert a WAV file say from 16-Bit Stereo to 8-Bit Mono, including converting the sample rate as well.  
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Question by:dannil
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Expert Comment

by:dtowell
ID: 1399644
Don't bother with ACM, just read the samples and write them yourself.  Use the following conversions:

16bit to 8bit:  use only the top 8 bits for each sample
8bit to 16bit:  duplicate the 8bits for each half of the sample
stereo to mono(easy): choose left or right chanel, ignore other
stereo to mono(hard): add left and right and divide by 2
mono to stereo: duplicate data for both channels
22k to 11k: use every other sample
44k to 22k: use every other sample
22k to 44k(easy): duplicate every sample
22k to 44k(hard): interpolate between samples
11k to 22k:  see 22k to 44k
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chensu earned 100 total points
ID: 1399645
There is an example code called "ACMApp" that comes with Video for Windows 1.1 DK. I can send it to you by E-Mail. (Please tell me your E-Mail address.)
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Expert Comment

by:xyzhuang
ID: 1399646
The windows default drivers can not convert the waveform with
sample rate bigger than 48KHz!
So if you want to know the algorithm, please let me know.
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Expert Comment

by:chensu
ID: 1399647
You can refer to WAVEMIX DLL source code. The source code contains some functions to convert standard PCM formats by resampling. You can find it on Microsoft Multimedia JumpStart 2.0 CD-ROM or Microsoft FTP site (I am not sure).
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