Open Sound System
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The PCM_CAP_SPECIAL flag is used to mark audo devices that typically should not be used by ordinary applications such as games and multimedia players.
This capability is used internally by OSS drivers. Applications should not use this flag.
Audio device capabilities like PCM_CAP_SPECIAL can be checked using the SNDCTL_AUDIOINFO or SNDCTL_DSP_GETCAPS ioctl calls.