From: James Courtier-Dutton <James@superbug.demon.co.uk>
To: "Måns Rullgård" <mru@kth.se>
Cc: alsa-devel@lists.sourceforge.net
Subject: Re: Re: Audio and Video sync. Getting Timestamps
Date: Fri, 07 May 2004 11:52:11 +0000 [thread overview]
Message-ID: <409B786B.3050607@superbug.demon.co.uk> (raw)
In-Reply-To: <yw1xk6zoen8d.fsf@kth.se>
Måns Rullgård wrote:
> James Courtier-Dutton <James@superbug.demon.co.uk> writes:
<snip>
>
> The OP was recording.
>
Oops. My explanation only covers playback, not capture.
But if you use the snd_pcm_avail_update() just before you capture some
samples from the buffer, then do a gettimeofday(), you will get an
accurate measure of when the samples arrived in the buffer.
If you also use a thread and get it to do poll(), you could also keep
the latency down, with it calling the routine on each period elapsed.
Summary: Use a method similar to the playback method, but just modify it
a be for record.
Cheers
James
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prev parent reply other threads:[~2004-05-07 11:52 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-05 9:13 Audio and Video sync. Getting Timestamps granda
2004-05-05 9:38 ` Takashi Iwai
2004-05-05 9:39 ` Jaroslav Kysela
2004-05-06 23:32 ` Juan Carlos Granda
2004-05-07 0:02 ` James Courtier-Dutton
2004-05-07 6:59 ` Måns Rullgård
2004-05-07 11:52 ` James Courtier-Dutton [this message]
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