[Stk] Using 24bit wav andd aiff files

[Richard Dobson]

Any WAVE file used to hold 24bit audio needs to be written as 
WAVEFORMATEXTENSIBLE (WAVEX); ditto for channel counts above stereo, and 
sample rates above 48KHz.  The stk code does really need expanding to 
include support for WAVEX. This format has been around for over 20 years 
now, so there should be no thought that it is in any way unusual or 
non-standard. This incidentally also has expliit support for sample 
container sizes larger than sample sizes, e.g. 20bit audio in 24bit 
containers. Unfortunately I do not have the time to make such a 
large-scale addition myself at the moment. I suppose linking with 
libsndfile is out of the question licence-wise?

NB also: AIFF/AIFF-C does not allow four bytes to be used to contain 
24bit audio. Anything stored in 32bits should be consistent with respect 
to the 0DbFS level - so the three bytes of the word should be 
left-aligned - becoming effectively heavily quantised 32bit samples.

Richard Dobson

On 20/06/2011 22:06, Carlos Luna wrote:
>
> Hi Gary. From what I´ve found, the first problem is here: bool
> FileRead :: getWavInfo( const char *fileName ){...... if ( format_tag
> == 1 ) {    if (temp == 8)      dataType_ = STK_SINT8;    else if
> (temp == 16)      dataType_ = STK_SINT16;    else if (temp == 32)
> dataType_ = STK_SINT32;  } ......} That part of the code never checks
> for 24 bits files, so loading such files always returns an error. I
> changed it to: .....if ( format_tag == 1 ) {    if (temp == 8)
....