Re: [Alsa-user] speaker-test works but a aplay does not
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>
> Please try putting this into your ~/.asoundrc:
>
> pcm.stereoonly { type hw card 0 channels 2 }
>
> and then running "aplay -v -D plug:stereoonly
> /.../Front_Center.wav". Does it work? Does it expand the file to
> two channels?
>
I did so and could hear the sound out of the internal sound card and
there is no error message that the conversion into two channells did
not work:
aplay -v -D plug:stereoonly /usr/share/sounds/alsa/Front_Center.wav
Playing WAVE '/usr/share/sounds/alsa/Front_Center.wav' : Signed 16 bit
Little Endian, Rate 48000 Hz, Mono
Plug PCM: Route conversion PCM (sformat=S16_LE)
Transformation table:
0 <- 0
1 <- 0
Its setup is:
stream : PLAYBACK
access : RW_INTERLEAVED
format : S16_LE
subformat: STD
channels : 1
rate : 48000
exact rate : 48000 (48000/1)
msbits : 16
buffer_size : 16384
period_size : 4096
period_time : 85333
tstamp_mode : NONE
period_step : 1
avail_min: 4096
period_event : 0
start_threshold : 16384
stop_threshold : 16384
silence_threshold: 0
silence_size : 0
boundary : 1073741824
Slave: Hardware PCM card 0 'bcm2835 ALSA' device 0 subdevice 0
Its setup is:
stream : PLAYBACK
access : MMAP_INTERLEAVED
format : S16_LE
subformat: STD
channels : 2
rate : 48000
exact rate : 48000 (48000/1)
msbits : 16
buffer_size : 16384
period_size : 4096
period_time : 85333
tstamp_mode : NONE
period_step : 1
avail_min: 4096
period_event : 0
start_threshold : 16384
stop_threshold : 16384
silence_threshold: 0
silence_size : 0
boundary : 1073741824
appl_ptr : 0
hw_ptr : 0
If I set it for the external sound card by changing "card 0" to "card 1"
aplay -v -D plug:stereoonly /usr/share/sounds/alsa/Front_Center.wav
still gives the error
Playing WAVE '/usr/share/sounds/alsa/Front_Center.wav' : Signed 16 bit
Little Endian, Rate 48000 Hz, Mono
aplay: set_params:1297: Unable to install hw params:
ACCESS: RW_INTERLEAVED
FORMAT: S16_LE
SUBFORMAT: STD
SAMPLE_BITS: 16
FRAME_BITS: 16
CHANNELS: 1
RATE: 48000
PERIOD_TIME: 125000
PERIOD_SIZE: 6000
PERIOD_BYTES: 12000
PERIODS: 4
BUFFER_TIME: 50
BUFFER_SIZE: 24000
BUFFER_BYTES: 48000
TICK_TIME: 0
Kind regards,
Hauke
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Re: [Alsa-user] combine usb microphones (joop)
In addition, if the microphones have identical sound cards, you can identify them according to the USB port where they are connected using udev rules: http://alsa.opensrc.org/Udev A working example: http://zenbakaitz.servehttp.com Regards, José Luis -- Find and fix application performance issues faster with Applications Manager Applications Manager provides deep performance insights into multiple tiers of your business applications. It resolves application problems quickly and reduces your MTTR. Get your free trial! https://ad.doubleclick.net/ddm/clk/302982198;130105516;z ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] speaker-test works but a aplay does not
Hauke Westemeier wrote:
>> "Front Right" is the name of the channel. There could be other
>> channels such as "Side Right", "Back Right"; and the channel in
>> the front would be called "Center".
>
> So although the file is called Front_Right.wav aplay should play it on
> both of my channels the same signal at the same time (as it is mono
> and plughw sends it to both of my channels), correct?
Yes.
> Just for completeness, I tried
> aplay -D plughw:0,0 /usr/share/sounds/alsa/Front_Left.wav
> and then I can hear the sound out of the internal sound card (as
> expected). So the aplay and the wav-file are not completely broken.
The internal sound device actually supports mono.
I don't know why the mono->stereo expansion does not work. This should
be handled automatically by the plug plugin. It would be possible to
explicitly disable this when compiling alsa-lib, but Debian does not do
this.
Please try putting this into your ~/.asoundrc:
pcm.stereoonly {
type hw
card 0
channels 2
}
and then running "aplay -v -D plug:stereoonly /.../Front_Center.wav".
Does it work? Does it expand the file to two channels?
Regards,
Clemens
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Re: [Alsa-user] combine usb microphones
Bas Hopmans wrote:
> what would i put in my .asoundrc?
Something like this:
pcm.fourchannels {
type plug
slave.pcm {
type multi
slaves {
a { pcm "hw:0" channels 1 }
b { pcm "hw:1" channels 1 }
c { pcm "hw:2" channels 1 }
d { pcm "hw:3" channels 1 }
}
bindings [
{ slave a channel 0 }
{ slave b channel 0 }
{ slave c channel 0 }
{ slave d channel 0 }
]
}
}
Regards,
Clemens
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