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Open Sound System
OSS 4.x Programmer's Guide
AFMT_IMA_ADPCM sample format
IMA ADPCM encoded 4 bit sample format (obsolete).
This sample format uses an adaptive algorithm to pack a 16 bit sample using just 4 bits (1:4 compression). This format for supported by some old devices that are no longer available. For this reason none of the OSS drivers support it (no plans to add support for it in the future). Do not use this format in applications.
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