Noticeable when using Pulseaudio with 5.1 channel. Center volume is almost
inaudible even though alsamixer shows every channel is maxed out. The test
log shows that the decibels are wrong.
dbverify output: http://pastie.org/2882755
./dbverify XFi Master 30 200
Opening plughw:XFi for PCM.
Plug PCM: Hardware PCM card 0 'Creative X-Fi' device 0 subdevice 0
Its setup is:
stream : PLAYBACK
access : RW_INTERLEAVED
format : FLOAT_LE
subformat : STD
channels : 1
rate : 44100
exact rate : 44100 (44100/1)
msbits : 32
buffer_size : 32768
period_size : 256
period_time : 5804
tstamp_mode : NONE
period_step : 1
avail_min : 256
period_event : 0
start_threshold : 1
stop_threshold : 32768
silence_threshold: 0
silence_size : 0
boundary : 4611686018427387904
appl_ptr : 0
hw_ptr : 0
Opening hw:XFi for control.
Using element 'Master'.
Element volume range is 0..256 (-99999.99..0.00 dB).
Testing volume steps 30 vs. 200.
Testing dB steps -56.50 vs. -14.00.
Attenuation factor is 0.0075 (-42.50 dB).
Playing 1s of audio at amplitude 0.7500, mixer set to 30 (-56.50 dB).
Mixer set, sleeping 0.5s
Sleeping 0.5s...
Playing 1s of audio at amplitude 0.0056, mixer set to 200 (-14.00 dB).
Mixer set, sleeping 0.5s
./dbverify XFi PCM 30 200
Opening plughw:XFi for PCM.
Plug PCM: Hardware PCM card 0 'Creative X-Fi' device 0 subdevice 0
Its setup is:
stream : PLAYBACK
access : RW_INTERLEAVED
format : FLOAT_LE
subformat : STD
channels : 1
rate : 44100
exact rate : 44100 (44100/1)
msbits : 32
buffer_size : 32768
period_size : 256
period_time : 5804
tstamp_mode : NONE
period_step : 1
avail_min : 256
period_event : 0
start_threshold : 1
stop_threshold : 32768
silence_threshold: 0
silence_size : 0
boundary : 4611686018427387904
appl_ptr : 0
hw_ptr : 0
Opening hw:XFi for control.
Using element 'PCM'.
Element volume range is 0..256 (-99999.99..0.00 dB).
Testing volume steps 30 vs. 200.
Testing dB steps -56.50 vs. -14.00.
Attenuation factor is 0.0075 (-42.50 dB).
Playing 1s of audio at amplitude 0.7500, mixer set to 30 (-56.50 dB).
Mixer set, sleeping 0.5s
Sleeping 0.5s...
Playing 1s of audio at amplitude 0.0056, mixer set to 200 (-14.00 dB).
Mixer set, sleeping 0.5s
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