[Stk] Using 24bit wav andd aiff files

[Gary Scavone]

Hi Carlos,

I recently noticed some discrepancies with 24-bit support in STK (and RtAudio).  While SINT24 was listed as "Upper 3 bytes of 32-bit signed integer", the code in FileRead was partly assuming it to be the lower 3 bytes.  After some consideration, I decided to change the definition of SINT24 to the "lower 3 bytes" for the next release, with the resulting addition of one line to the FileRead :: open() function code:

     if ( fread( &buf, 3, 1, fd_ ) != 1 ) goto error;
+      buf >>= 8;
      if ( byteswap_ ) ...

Is this the problem you found?  Do you see any particular advantage to defining an SINT24 to be the upper vs. the lower 3 bytes?

Regards,

--gary

On 2011-06-11, at 1:18 PM, Carlos Luna wrote:

> Hi. I´ve just began using STK and have found it very interesting. I hope I can contribute to this project in the future. Now, to the point: has anyone been able to load a 24bit file using the FileRead class (STK ver. 4.4.2)? When I try to load a 24bit wav file, it gives me an error (FileRead: 24 bits per sample with data format 1 are not supported) and refuses to load. When loading a 24 bit aiff file, it loads but then the playback outputs just noise.
> 
> I´ve written some fixes for this, and now it seems to work ok (for both wav and aiff files). But before posting them, I´d like to know if this is a general problem (and somehow, no one has needed to use 24 bit files before) or it´s just me not knowing how to correctly use the FileRead class.
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