From: Clemens Ladisch <clemens-P6GI/4k7KOmELgA04lAiVw@public.gmane.org>
To: Laurent Pinchart
<laurent.pinchart-AgBVmzD5pcezQB+pC5nmwQ@public.gmane.org>
Cc: alsa-devel-K7yf7f+aM1XWsZ/bQMPhNw@public.gmane.org,
linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [RFC] ALSA vs. dedicated char device for a USB Audio Class gadget driver
Date: Tue, 19 May 2009 13:01:07 +0200 [thread overview]
Message-ID: <4A129173.6090205@ladisch.de> (raw)
In-Reply-To: <200905181647.41771.laurent.pinchart-AgBVmzD5pcezQB+pC5nmwQ@public.gmane.org>
Laurent Pinchart wrote:
> On Monday 18 May 2009 10:39:24 Clemens Ladisch wrote:
> > The ALSA API doesn't give you access to the SOF clock.
>
> Does the ALSA API give applications access to the audio clock ?
ALSA wakes up the application (if it's blocked) whenever a sound card
interrupt happens, i.e., at period boundaries. At all times, you can
get the current sample position by calling snd_pcm_delay().
> As Alan Stern mention in his e-mail, does ALSA allow an application to
> resample audio from an ALSA source (microphone on sound card 1) before
> sending it to an ALSA sink (speaker on sound card 2) ?
It is possible, if the application monitors the speed of both devices.
Best regards,
Clemens
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next prev parent reply other threads:[~2009-05-19 11:01 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <laurent.pinchart@skynet.be>
[not found] ` <200905141545.01798.laurent.pinchart-AgBVmzD5pcezQB+pC5nmwQ@public.gmane.org>
2009-05-14 18:18 ` [RFC] ALSA vs. dedicated char device for a USB Audio Class gadget driver Hal Murray
2009-05-14 20:58 ` Laurent Pinchart
[not found] ` <200905142258.42935.laurent.pinchart-AgBVmzD5pcezQB+pC5nmwQ@public.gmane.org>
2009-05-14 21:12 ` Steve Calfee
[not found] ` <4a5ff6bc0905141412t5ab4f0f5x6c50b4e38af0790f-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2009-05-14 21:25 ` Laurent Pinchart
[not found] ` <200905142325.24408.laurent.pinchart-AgBVmzD5pcezQB+pC5nmwQ@public.gmane.org>
2009-05-15 7:01 ` [alsa-devel] " Clemens Ladisch
[not found] ` <4A0D135C.7090806-P6GI/4k7KOmELgA04lAiVw@public.gmane.org>
2009-05-15 9:36 ` Laurent Pinchart
[not found] ` <200905151136.52995.laurent.pinchart-AgBVmzD5pcezQB+pC5nmwQ@public.gmane.org>
2009-05-15 15:07 ` Clemens Ladisch
[not found] ` <4A0D8532.4070104-P6GI/4k7KOmELgA04lAiVw@public.gmane.org>
2009-05-15 15:52 ` Laurent Pinchart
[not found] ` <200905151752.58040.laurent.pinchart-AgBVmzD5pcezQB+pC5nmwQ@public.gmane.org>
2009-05-15 17:04 ` Clemens Ladisch
2009-05-17 16:49 ` Laurent Pinchart
2009-05-15 20:15 ` Hal Murray
[not found] ` <20090515201519.7C347BCE6-1EH7ZSm6cX1tFMQ1DeeEjrzXk6sypdOaHzxsA6J8rrk@public.gmane.org>
2009-05-17 17:25 ` Laurent Pinchart
[not found] ` <200905171925.23956.laurent.pinchart-AgBVmzD5pcezQB+pC5nmwQ@public.gmane.org>
2009-05-17 21:28 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.0905171654500.20300-100000-pYrvlCTfrz9XsRXLowluHWD2FQJk+8+b@public.gmane.org>
2009-05-18 14:36 ` Laurent Pinchart
2009-05-18 8:39 ` Clemens Ladisch
[not found] ` <4A111EBC.2010606-P6GI/4k7KOmELgA04lAiVw@public.gmane.org>
2009-05-18 14:47 ` Laurent Pinchart
[not found] ` <200905181647.41771.laurent.pinchart-AgBVmzD5pcezQB+pC5nmwQ@public.gmane.org>
2009-05-19 11:01 ` Clemens Ladisch [this message]
2009-05-14 13:45 Laurent Pinchart
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