Re: FLLR (compression ?) in AIFF file
Re: FLLR (compression ?) in AIFF file
- Subject: Re: FLLR (compression ?) in AIFF file
- From: William Stewart <email@hidden>
- Date: Thu, 7 Aug 2008 12:29:19 -0700
Actually...
The real recommendation is that as AIFC is still limited in the types
of audio compression formats it can contain, we now strongly encourage
and recommend developers to use the CAF file format as a complete
superset of both AIF and WAV files.
Details on CAF can be found at Apple's developer web site - there is a
full specification document.
CAF is also supported in the OS from Tiger onwards
Bill
On Aug 6, 2008, at 3:41 AM, Richard Dobson wrote:
Stephen Davis wrote:
The FLLR chunk is added by the AudioFile code to align the data
chunk on a 4K page boundary for optimized I/O during playback.
The AIFF specification says to ignore chunks you don't recognize
and skip over them. This is such a chunk. :-)
As for the NONE chunk, it is not a separate chunk but is found in
the "compressionType" field of the COMM chunk.
Only in AIFC files (the COMM chunk is larger there with extra
fields). AIFF does not support compression (or 32bit floats). But
the recommendation is that AIFC supercedes AIFF, so should be used
for everything, these days.
Richard Dobson
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