delphi - Why i get NAN value when storing mmioRead result in double? -


why nan value when trying read .wav file , directly store sample data in double? before thinking using store sample data in smallint , convert double dividing 32768.0 (there no nan value) later on got accuracy problem rounding off when converting wav file.

setlength(buf, ckidata.cksize); mmioread(hmmio, pansichar(buf), ckidata.cksize);

where buf array of double. weren't allowed directly storing array of double?

if raw sample data 64-bit doubles (what audio format using that?), yes, can directly read array of doubles, eg:

var   buf: array of double;  setlength(buf, ckidata.cksize div sizeof(double)); mmioread(hmmio, pansichar(buf), length(buf) * sizeof(double));

however, audio formats not use doubles, have first read suitable buffer using correct data type (smallint 16-bit pcm, example), convert samples afterwards.


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