[Speex-dev] converting 16-bit samples in LPSTR to short

John Miles jmiles at pop.net
Sat Sep 16 09:35:53 PDT 2006

Is "nBytes" what it says -- the number of bytes in the buffer?  If so,
you're overshooting the buffer by 2x by multiplying by 2 in your array
access.  You probably want a variable called "nSamples" that represents the
number of 16-bit words.

Also, if this is a little-endian (Windows on x86?) machine, you're
reassembling the word backwards.

Not to mention, shifting a BYTE left by 8 inside those parentheses is
probably turning it into 0.  If you actually need to swap the bytes, try
casting to a short before shifting.

-- john

     BYTE a = lpSaveBuffer[2*j];    // left byte
     BYTE b = lpSaveBuffer[2*j + 1]; // right byte
     short sample =  (a << 8) | (b & 0xff);

I'm getting garbage as a result of this conversion. Any help would be
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.xiph.org/pipermail/speex-dev/attachments/20060916/62c5e7a8/attachment.html

More information about the Speex-dev mailing list