From 85e4704151677b8fcc5ccfc396071828e9ec1b8e Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Tue, 8 Jul 2014 16:52:32 +0200 Subject: pcm: Provide a CLOCK_MONOTONIC_RAW timestamp type For applications which need to synchronise with external timebases such as broadcast TV applications the kernel monotonic time is not optimal as it includes adjustments from NTP and so may still include discontinuities due to that. A raw monotonic time which does not include any adjustments is available in the kernel from getrawmonotonic() so provide userspace with a new timestamp type SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW which provides timestamps based on this as an option. Reported-by: Daniel Thompson Signed-off-by: Mark Brown Signed-off-by: Takashi Iwai --- include/sound/asound.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'include') diff --git a/include/sound/asound.h b/include/sound/asound.h index 1774a5c3..9061cdd5 100644 --- a/include/sound/asound.h +++ b/include/sound/asound.h @@ -457,7 +457,8 @@ struct snd_xfern { enum { SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY = 0, /* gettimeofday equivalent */ SNDRV_PCM_TSTAMP_TYPE_MONOTONIC, /* posix_clock_monotonic equivalent */ - SNDRV_PCM_TSTAMP_TYPE_LAST = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC, + SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW, /* monotonic_raw (no NTP) */ + SNDRV_PCM_TSTAMP_TYPE_LAST = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW, }; /* channel positions */ -- cgit v1.2.3