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| author | Jaroslav Kysela <perex@perex.cz> | 2008-01-11 08:45:08 +0100 |
|---|---|---|
| committer | Jaroslav Kysela <perex@perex.cz> | 2008-01-31 17:29:54 +0100 |
| commit | 8c12158687fc78091730d5456336b7efbf6f2250 (patch) | |
| tree | f5b27075a4fde3f3eabbe7f05a12fec5559664b6 /sound/core/pcm_native.c | |
| parent | a64135a2d880183a2aff149f42dab7779a37a67f (diff) | |
| download | linux-rt-8c12158687fc78091730d5456336b7efbf6f2250.tar.gz | |
[ALSA] PCM interface - rename SNDRV_PCM_TSTAMP_MMAP to SNDRV_PCM_TSTAMP_ENABLE
Change semantics for SNDRV_PCM_TSTAMP_MMAP. Doing timestamping only in
the interrupt handler might cause that hw_ptr is not related to actual
timestamp. With this change, grab timestamp at every hw_ptr update to
have always valid timestamp + ring buffer position pair.
With this change, SNDRV_PCM_TSTAMP_MMAP was renamed to
SNDRV_PCM_TSTAMP_ENABLE. It's no regression (I think).
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Diffstat (limited to 'sound/core/pcm_native.c')
| -rw-r--r-- | sound/core/pcm_native.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c index e6e4aa87e57e..62449117ee14 100644 --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -580,9 +580,15 @@ int snd_pcm_status(struct snd_pcm_substream *substream, if (status->state == SNDRV_PCM_STATE_OPEN) goto _end; status->trigger_tstamp = runtime->trigger_tstamp; - if (snd_pcm_running(substream)) + if (snd_pcm_running(substream)) { snd_pcm_update_hw_ptr(substream); + if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { + status->tstamp = runtime->status->tstamp; + goto _tstamp_end; + } + } snd_pcm_gettime(runtime, &status->tstamp); + _tstamp_end: status->appl_ptr = runtime->control->appl_ptr; status->hw_ptr = runtime->status->hw_ptr; if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |