From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
To: Raymond Yau <superquad.vortex2@gmail.com>
Cc: ALSA Development Mailing List <alsa-devel@alsa-project.org>
Subject: Re: [PATCH v2 10/10] ALSA: hda: replace .wallclock by .get_time_info
Date: Sat, 20 Dec 2014 11:50:45 -0600 [thread overview]
Message-ID: <5495B6F5.2050603@linux.intel.com> (raw)
In-Reply-To: <CAN8cciZS2d68UFRN08dHcyjN8Ajud-_JRyoMLcK9-ZEp2cQhTw@mail.gmail.com>
>> + audio_tstamp_report->accuracy_m = 42; /* 24 MHz WallClock
> == 42ns resolution */
>> + audio_tstamp_report->accuracy_e = 0;
>> +
>
> Do you mean wall clock run at 48000 * 500 Hz ? 42.666ns
HDAudio wall clock (and bit clock) runs at 24MHz. So yes that's 48000 * 500.
> Those aureal sound cards also can provide time stamp using VORTEX_SMP_TIME
> mmio register which tick at 48000 * 256 Hz ?
then it should be fairly easy to implement the same feature...
next prev parent reply other threads:[~2014-12-20 17:50 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-19 17:25 [PATCH v2 00/10] audio timestamping evolutions Pierre-Louis Bossart
2014-12-19 17:25 ` [PATCH v2 01/10] ALSA: core: don't override timestamp unconditionally Pierre-Louis Bossart
2014-12-19 17:25 ` [PATCH v2 02/10] ALSA: core: allow for trigger_tstamp snapshot in .trigger Pierre-Louis Bossart
2014-12-19 17:25 ` [PATCH v2 03/10] ALSA: hda: read trigger_timestamp immediately after starting DMA Pierre-Louis Bossart
2014-12-19 17:25 ` [PATCH v2 04/10] ALSA: usb: update trigger timestamp on first non-zero URB submitted Pierre-Louis Bossart
2014-12-19 17:25 ` [PATCH v2 05/10] ALSA: core: add info_ext field in hw_params and pcm_hardware Pierre-Louis Bossart
2014-12-19 17:25 ` [PATCH v2 06/10] ALSA: core: selection of audio_tstamp type and accuracy reports Pierre-Louis Bossart
2014-12-19 17:25 ` [PATCH v2 07/10] ALSA: core: pass audio tstamp config from userspace Pierre-Louis Bossart
2014-12-19 17:25 ` [PATCH v2 08/10] ALSA: core: pass audio tstamp config from userspace in compat mode Pierre-Louis Bossart
2014-12-19 17:25 ` [PATCH v2 09/10] ALSA: core: replace .wall_clock by .get_time_info Pierre-Louis Bossart
2014-12-19 17:25 ` [PATCH v2 10/10] ALSA: hda: replace .wallclock " Pierre-Louis Bossart
2014-12-20 6:07 ` Raymond Yau
2014-12-20 17:50 ` Pierre-Louis Bossart [this message]
2014-12-19 20:38 ` [PATCH v2 00/10] audio timestamping evolutions Jaroslav Kysela
2014-12-19 21:17 ` Pierre-Louis Bossart
2014-12-21 13:14 ` Jaroslav Kysela
2014-12-26 11:12 ` Takashi Iwai
2015-01-05 21:11 ` Pierre-Louis Bossart
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