WAVE_FACT_CHUNK

Controls how the fact chunk affects the loading of a WAVE file.

The fact chunk stores information about the number of samples of a WAVE

file. The Standards Update from Microsoft notes that this value can be used

to 'determine the length of the data in seconds'. This is especially useful

for compressed formats (for which this is a mandatory chunk) if they produce

multiple sample frames per block and truncating the block is not allowed.

The fact chunk can exactly specify how many sample frames there should be

in this case.

Unfortunately, most application seem to ignore the fact chunk and so SDL

ignores it by default as well.

This variable can be set to the following values:

• "truncate" - Use the number of samples to truncate the wave data if

  the fact chunk is present and valid

• "strict" - Like "truncate", but raise an error if the fact chunk

  is invalid, not present for non-PCM formats, or if the

  data chunk doesn't have that many samples

• "ignorezero" - Like "truncate", but ignore fact chunk if the number of

  samples is zero

• "ignore" - Ignore fact chunk entirely (default)