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Resources to learn more about the difference between packed and unpacked (high/low aligned) samples?
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Resources to learn more about the difference between packed and unpacked (high/low aligned) samples?


  • Subject: Resources to learn more about the difference between packed and unpacked (high/low aligned) samples?
  • From: Reed Weichler <email@hidden>
  • Date: Mon, 12 May 2014 03:08:45 -0700

I'm looking at the documentation for AudioStreamBasicDescription's possible values for mFormatFlags here: https://developer.apple.com/library/mac/documentation/musicaudio/reference/CoreAudioDataTypesRef/Reference/reference.html#//apple_ref/doc/constant_group/Audio_Data_Format_Identifiers

I understand what most of the flags mean, namely float vs sint vs. uint, interleaved vs noninterleaved, and big endian vs little endian. But the one that's stumping me completely is what packed, high-aligned and low-aligned samples are. Could someone be kind enough to explain this to me, or provide a link to some sort of documentation on this? I have no idea what they are or could possibly mean. The documentation doesn't elaborate on it and I can't find anything on Google.

Thanks much.

Reed Weichler
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