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authorMax Kellermann <max@duempel.org>2009-03-08 03:55:01 +0100
committerMax Kellermann <max@duempel.org>2009-03-08 03:55:01 +0100
commit554a34fb958cfa15c00a81671a72079cae00ca5f (patch)
treed1679a457a676b1dc836c1aa8da111df109aae69 /src/decoder
parent27193d84026dca7dce8e864da5a703e203347cdc (diff)
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alsa: better period_time default value for high sample rates
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.
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