From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
To: Takashi Iwai <tiwai@suse.de>
Cc: Dylan Reid <dgreid@chromium.org>, alsa-devel@alsa-project.org
Subject: Re: [PATCH v2] ALSA: hda/ca0132 - Update latency based on DSP state.
Date: Fri, 05 Apr 2013 10:01:04 -0500 [thread overview]
Message-ID: <515EE730.6080705@linux.intel.com> (raw)
In-Reply-To: <s5hehep4jt9.wl%tiwai@suse.de>
>> The DSP in the CA0132 codec adds a variable latency to audio depending
>> on what processing is being done. Add a new patch op to return that
>> latency for capture and playback streams. The latency is determined
>> by which blocks are enabled and knowing how much latency is added by
>> each block.
>>
>> Signed-off-by: Dylan Reid <dgreid@chromium.org>
>
> Thanks, applied.
This conflicts with the audio timestamp stuff I contributed last year.
If the hardware supports a WALLCLK, and HDA does, the timestamp is just
a read of the counter plus a translation to ns. If it doesn't, the
timestamp corresponds to the delay. If you modify the definition of the
delay then the timestamp will be off on some platforms.
-Pierre
next prev parent reply other threads:[~2013-04-05 15:01 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-04 20:55 [PATCH v2] ALSA: hda/ca0132 - Update latency based on DSP state Dylan Reid
2013-04-05 5:40 ` Takashi Iwai
2013-04-05 15:01 ` Pierre-Louis Bossart [this message]
2013-04-05 15:22 ` Takashi Iwai
2013-04-05 16:28 ` Pierre-Louis Bossart
2013-04-05 17:01 ` Dylan Reid
2013-04-05 17:20 ` Pierre-Louis Bossart
2013-04-05 18:13 ` Dylan Reid
2013-04-05 21:24 ` Pierre-Louis Bossart
2013-04-05 21:44 ` Dylan Reid
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