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From: "Jirka Hanika" <HANIKA@ksvi.mff.cuni.cz>
To: linux-sound@vger.kernel.org
Subject: SNDCTL_DSP_BUSY
Date: Fri, 22 Oct 1999 21:22:44 +0000	[thread overview]
Message-ID: <marc-linux-sound-94063085304036@msgid-missing> (raw)

Hi,

a programming question.

I need an ioctl or some other API to find out whether the sound card 
has completely processed the buffers.  Something exactly like 
ioctl(SNDCTL_DSP_SYNC), but an asynchronous breed.
I have looked at audio.c and there is no such ioctl.

The only solution known to me is to write the neutral sample (silence)
asynchronously to the sound card until a bufferfarmfull bytes is 
written, then ioctl(SNDCTL_DSP_RESET).  This is however ugly as 
12-bit FAT.

In case there is no better approach available, what would you think of a 
new ioctl (say SNDCTL_DSP_BUSY)?

Jirka

             reply	other threads:[~1999-10-22 21:22 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
1999-10-22 21:22 Jirka Hanika [this message]
1999-10-22 23:17 ` SNDCTL_DSP_BUSY Paco
1999-10-25 10:07 ` SNDCTL_DSP_BUSY Thomas Sailer

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