diff options
| author | Glenn Kasten <gkasten@google.com> | 2013-08-22 15:11:48 -0700 |
|---|---|---|
| committer | Glenn Kasten <gkasten@google.com> | 2013-09-03 11:11:10 -0700 |
| commit | 810124041268e4f0b20d271ddc566d11ecb8575f (patch) | |
| tree | e3e180d1e7f0f182c308e320fc4a56cba879ad67 /include | |
| parent | 782bfda5e796cb46d0e7be0dc882ff686d5ad2a2 (diff) | |
pcm_get_htimestamp can now use CLOCK_MONOTONIC
Previously the timebase was not documented. Now a new pcm_open flag
can be used to specify the clock. If flag PCM_MONOTONIC is specified,
then pcm_open uses SNDRV_PCM_IOCTL_TTSTAMP with parameter
SNDRV_PCM_TSTAMP_TYPE_MONOTONIC to request timestamps in CLOCK_MONOTONIC.
Change-Id: I40ce359cb38d686cbb2521fb0602a8a17ab4f925
Diffstat (limited to 'include')
| -rw-r--r-- | include/tinyalsa/asoundlib.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/tinyalsa/asoundlib.h b/include/tinyalsa/asoundlib.h index 3d20b94..5c08577 100644 --- a/include/tinyalsa/asoundlib.h +++ b/include/tinyalsa/asoundlib.h @@ -55,6 +55,7 @@ struct pcm; * second call to pcm_write will attempt to * restart the stream. */ +#define PCM_MONOTONIC 0x00000008 /* see pcm_get_htimestamp */ /* PCM runtime states */ #define PCM_STATE_OPEN 0 @@ -166,6 +167,8 @@ unsigned int pcm_bytes_to_frames(struct pcm *pcm, unsigned int bytes); unsigned int pcm_get_latency(struct pcm *pcm); /* Returns available frames in pcm buffer and corresponding time stamp. + * The clock is CLOCK_MONOTONIC if flag PCM_MONOTONIC was specified in pcm_open, + * otherwise the clock is CLOCK_REALTIME. * For an input stream, frames available are frames ready for the * application to read. * For an output stream, frames available are the number of empty frames available |