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Impemented snd_pcm_htimestamp() function.

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This commit is contained in:
Jaroslav Kysela 2008-01-09 13:50:45 +01:00
parent 309a274454
commit 2c1318803f
19 changed files with 182 additions and 14 deletions
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25
src/pcm/pcm.c
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@ -343,7 +343,8 @@ is equal or greater than this value, then application will be activated.
The timestamp mode specifies, if timestamps are activated. Currently, only
#SND_PCM_TSTAMP_NONE and #SND_PCM_TSTAMP_MMAP
modes are known. The mmap mode means that timestamp is taken
on every period time boundary.
on every period time boundary. Corresponding position in the ring buffer
assigned to timestamp can be obtained using #snd_pcm_htimestamp() function.
\par Transfer align
@ -383,7 +384,7 @@ The stream status is stored in #snd_pcm_status_t structure.
These parameters can be obtained: the current stream state -
#snd_pcm_status_get_state(), timestamp of trigger -
#snd_pcm_status_get_trigger_tstamp(), timestamp of last
update #snd_pcm_status_get_tstamp(), delay in samples -
pointer update #snd_pcm_status_get_tstamp(), delay in samples -
#snd_pcm_status_get_delay(), available count in samples -
#snd_pcm_status_get_avail(), maximum available samples -
#snd_pcm_status_get_avail_max(), ADC over-range count in
@ -979,6 +980,26 @@ int snd_pcm_resume(snd_pcm_t *pcm)
return pcm->fast_ops->resume(pcm->fast_op_arg);
}
/**
* \brief Obtain last position update hi-res timestamp
* \param pcm PCM handle
* \param avail Number of available frames when timestamp was grabbed
* \param tstamp Hi-res timestamp
* \return 0 on success otherwise a negative error code
*
* Note this function does not update the actual r/w pointer
* for applications.
*/
int snd_pcm_htimestamp(snd_pcm_t *pcm, snd_pcm_uframes_t *avail, snd_htimestamp_t *tstamp)
{
assert(pcm);
if (CHECK_SANITY(! pcm->setup)) {
SNDMSG("PCM not set up");
return -EIO;
}
return pcm->fast_ops->htimestamp(pcm->fast_op_arg, avail, tstamp);
}
/**
* \brief Prepare PCM for use
* \param pcm PCM handle