this kind of arecord command produces good quality output file on my
laptop:
arecord -D plughw:0,0 -f S32_LE -c 2 /tmp/test-mic.wav
how should my .asoundrc look like in order to get the same effect
without -D, -f and -c parameters?
i have tried:
pcm.internal
{
type hw
card 0
format S32_LE
rate 48000
channels 2
}
pcm.!default
{
type asym
playback.pcm
{
type plug
slave.pcm "dmix"
}
capture.pcm
{
type plug
slave.pcm "internal"
}
}
but resulting file has very bad audio quality.
here is what -v produces with and without params:
$ arecord -v -D plughw:0,0 -f S32_LE -c 2 -d 10 /tmp/test-mic.wav
Recording WAVE '/tmp/test-mic.wav' : Signed 32 bit Little Endian, Rate 8000 Hz, Stereo
Plug PCM: Rate conversion PCM (48000, sformat=S32_LE)
Converter: libspeex (builtin)
Protocol version: 10002
Its setup is:
stream : CAPTURE
access : RW_INTERLEAVED
format : S32_LE
subformat : STD
channels : 2
rate : 8000
exact rate : 8000 (8000/1)
msbits : 32
buffer_size : 1365
period_size : 341
period_time : 42666
tstamp_mode : NONE
period_step : 1
avail_min : 341
period_event : 0
start_threshold : 1
stop_threshold : 1365
silence_threshold: 0
silence_size : 0
boundary : 178913280
$ arecord -v /tmp/test-mic.wav
Recording WAVE '/tmp/test-mic.wav' : Unsigned 8 bit, Rate 8000 Hz, Mono
Plug PCM: Rate conversion PCM (48000, sformat=U8)
Converter: libspeex (builtin)
Protocol version: 10002
Its setup is:
stream : CAPTURE
access : RW_INTERLEAVED
format : U8
subformat : STD
channels : 1
rate : 8000
exact rate : 8000 (8000/1)
msbits : 8
buffer_size : 1365
period_size : 341
period_time : 42666
tstamp_mode : NONE
period_step : 1
avail_min : 341
period_event : 0
start_threshold : 1
stop_threshold : 1365
silence_threshold: 0
silence_size : 0
boundary : 178913280
the latter shows that .asoundrc pcm.internal format, rate, and channels
have no effect.
i have read many also related howtos and docs, but have not yet been
able to figure out how to solve this problem. i need to get default
working in order to be able to use applications where it is not possible
to define audio capture and playback devices.
-- juha
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