[alsa-devel] [PATCH 0/2] RFC: support for audio wall clock

Pierre-Louis Bossart pierre-louis.bossart at linux.intel.com
Wed Jun 13 22:26:30 CEST 2012

Attached a set of patches to show how the audio wall clock (eg. the
HDAudio one) can be used to provide precise audio timestamps and track
the drift between audio time and system time. On my laptop I am able
to track a 7ppm delta.  I will explain in more details how this can be
used during LPC in San Diego, but with the summer coming I'd like to
get feedback as there are changes to the core/alsa-lib that haven't
been modified in years.

Pierre-Louis Bossart (2):
  ALSA: core: add hooks for audio timestamps read from WALLCLOCK
  ALSA: hda: support for wallclock timestamps

 include/sound/asound.h    |    7 +++-
 include/sound/pcm.h       |    2 +
 sound/core/pcm_lib.c      |   15 ++++++-
 sound/core/pcm_native.c   |    2 +
 sound/pci/hda/hda_intel.c |  106 ++++++++++++++++++++++++++++++++++++++++++++-
 5 files changed, 128 insertions(+), 4 deletions(-)


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