Thought I'd post something to show what the maxium buffer sizes are to
avoid people trying to tune too far.
To see what the actual audio output setup is, login to touch and restart
the application with audio.output logging set to debug:
Code:
--------------------
# /etc/init.d/squeezeplay restart
--------------------
Using EDO with the spdif output, the max buffer settings are:
Code:
--------------------
Hardware PCM card 0 'MXC SPDIF TX/RX' device 0 subdevice 0
Its setup is:
stream : PLAYBACK
access : MMAP_INTERLEAVED
format : S24_LE
subformat : STD
channels : 2
rate : 44100
exact rate : 44100 (44100/1)
msbits : 32
buffer_size : 4096
period_size : 1024
period_time : 23219
tstamp_mode : NONE
period_step : 1
avail_min : 1024
period_event : 0
start_threshold : 1
stop_threshold : 4096
silence_threshold: 0
silence_size : 0
boundary : 1073741824
--------------------
For usb the kernel driver allows a much larger buffer size, but not this
hides the fact that it is doing more work... In this case jive_alsa
transfers samples the kernel which then every 1ms (full speed) or 125us
(class 2 high speed) decides what to transfer over usb. So even though
jive_alsa is running less frequently the kernel driver is doing more
work
Code:
--------------------
Hardware PCM card 1 'Audiolab M-DAC' device 0 subdevice 0
Its setup is:
stream : PLAYBACK
access : MMAP_INTERLEAVED
format : S24_3LE
subformat : STD
channels : 2
rate : 44100
exact rate : 44100 (44100/1)
msbits : 24
buffer_size : 174760
period_size : 43690
period_time : 990702
tstamp_mode : NONE
period_step : 1
avail_min : 43690
period_event : 0
start_threshold : 1
stop_threshold : 174760
silence_threshold: 0
silence_size : 0
boundary : 1431633920
--------------------
------------------------------------------------------------------------
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View this thread: http://forums.slimdevices.com/showthread.php?t=94855
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