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[ALSA] PCM interface - rename SNDRV_PCM_TSTAMP_MMAP to SNDRV_PCM_TSTAMP_ENABLE

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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>
This commit is contained in:
Jaroslav Kysela 2008-01-11 08:45:08 +01:00
parent a64135a2d8
commit 8c12158687
4 changed files with 12 additions and 6 deletions
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4
include/sound/asound.h
View file

@ -354,8 +354,8 @@ struct snd_pcm_hw_params {
enum {
SNDRV_PCM_TSTAMP_NONE = 0,
SNDRV_PCM_TSTAMP_MMAP,
SNDRV_PCM_TSTAMP_LAST = SNDRV_PCM_TSTAMP_MMAP,
SNDRV_PCM_TSTAMP_ENABLE,
SNDRV_PCM_TSTAMP_LAST = SNDRV_PCM_TSTAMP_ENABLE,
};
struct snd_pcm_sw_params {

2
sound/core/pcm.c
View file

@ -227,7 +227,7 @@ static char *snd_pcm_subformat_names[] = {
static char *snd_pcm_tstamp_mode_names[] = {
TSTAMP(NONE),
TSTAMP(MMAP),
TSTAMP(ENABLE),
};
static const char *snd_pcm_stream_name(int stream)

4
sound/core/pcm_lib.c
View file

@ -144,6 +144,8 @@ static inline snd_pcm_uframes_t snd_pcm_update_hw_ptr_pos(struct snd_pcm_substre
{
snd_pcm_uframes_t pos;
if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
pos = substream->ops->pointer(substream);
if (pos == SNDRV_PCM_POS_XRUN)
return pos; /* XRUN */
@ -186,8 +188,6 @@ static inline int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *subs
snd_pcm_uframes_t new_hw_ptr, hw_ptr_interrupt;
snd_pcm_sframes_t delta;
if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_MMAP)
snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
if (pos == SNDRV_PCM_POS_XRUN) {
xrun(substream);

8
sound/core/pcm_native.c
View file

@ -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) {