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Fixes in documentation for fast status

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This commit is contained in:
Jaroslav Kysela 2002-10-09 06:13:57 +00:00
parent bcc0866b62
commit 3560bb1481
1 changed files with 8 additions and 3 deletions
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11
src/pcm/pcm.c
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@ -373,16 +373,21 @@ samples - \link ::snd_pcm_status_get_overrange \endlink. The last two
parameters - avail_max and overrange are reset to zero after the status
call.
\subsection pcm_status_fast Obtaining fast device status
\subsection pcm_status_fast Obtaining device status fast
The function \link ::snd_pcm_avail_update \endlink updates the current
available count of samples for writing (playback) or filled samples for
reading (capture).
reading (capture). It is a light version of
\link ::snd_pcm_status_get_avail \endlink, because it does not require
the user <-> kernel context switch, but the value is less accurate,
because ring buffer pointers are updated in kernel drivers only when
an interrupt occurs.
<p>
The function \link ::snd_pcm_delay \endlink returns the delay in samples.
For playback, it means count of samples in the ring buffer before
the next sample will be sent to DAC. For capture, it means count of samples
in the ring buffer before the next sample will be captured from ADC.
in the ring buffer before the next sample will be captured from ADC. It works
only when the stream is in the running or draining state.
\section pcm_action Managing the stream state