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alsa: better period_time default value for high sample rates

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The default values for buffer_time and period_time were both capped by
the hardware limits on practically all chips.  The result was a
period_time which was half as big as the buffer_time.  On some chips,
this led to lots of underruns when using a high sample rate (192 kHz),
because MPD had very little time to send new samples to ALSA.

A period time which is one fourth of the buffer time turned out to be
much better.  If no period_time is configured, see how much
buffer_time the hardware accepts, and try to configure one fourth of
it as period_time, instead of hard-coding the default period_time
value.

This is yet another attempt to provide a solution which is valid for
all sound chips.  Using the SND_PCM_NONBLOCK flag also seemed to solve
the underruns, but put a lot more CPU load to MPD.
This commit is contained in:
Max Kellermann
2009-03-08 03:55:01 +01:00
parent 27193d8402
commit 554a34fb95
2 changed files with 9 additions and 3 deletions
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@@ -28,6 +28,7 @@ ver 0.15 - (200?/??/??)
- mvp: check for reopen errors
- mvp: fixed default device detection
- pipe: new audio output plugin which runs a command
- alsa: better period_time default value for high sample rates
* commands:
- "playlistinfo" supports a range now
- added "sticker database", command "sticker", which allows clients