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On Thursday, 23 April 2020 10:46:29 BST Jorge Almeida wrote: |
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> On Thu, Apr 23, 2020 at 9:19 AM Michael <confabulate@××××××××.com> wrote: |
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> > I recall you having problems recording with this device before, but since |
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> > you're now a step ahead let's have another go at this, in case I may be |
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> > able to help. |
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> |
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> Yes, this is not the same issue (the former problem was: I wasn't |
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> getting anything from the RCA output; maybe it isn't supposed to--no |
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> documentation provided with the device--or that part is broken; |
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> anyway, I gave up on the RCA; the device works fine as a USB sound |
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> card) |
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|
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It may be the RCA signal is detected by the PC as a different interface, in |
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addition to the USB sound card, depending on how it is amplified and processed |
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before it arrives at the PC. |
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|
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What you show below as your dmesg output only presents the USB interface |
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detection. I would think there would be more in advance of those lines, |
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mentioning vendorID and productID. Anyway, if you're happy with it as a USB |
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device carry on. |
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|
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|
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> > > > The setup: |
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> > > > -- a microphone connected to an audio interface, which connects to an |
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> > > > USB port in the computer. The interface works like a USB sound card, |
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> > > > at least regarding sound capture. It works: I can record my voice with |
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> > > > arecord into a wav file, and then play the file with aplay. |
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> > > > -- a (motherboard) sound card with a toslink output connected to an |
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> > > > external DAC/amplifier. It works: playing wav, youtube, etc. |
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> > > > |
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> > > > The problem: |
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> > > > I need to use it for voice chat. I tried slack and discord (the latter |
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> > > > both via browser and app--there's a package in portage--, the former |
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> > > > only via browser). No sound, neither outbound nor inbound. |
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> > > > None of these programs provides a way to tell them which devices to |
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> > > > use, so I assume they just go for some default. |
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> > |
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> > Yes, this is the case or you're missing some audio module/driver/firmware, |
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> > which is probably unlikely for a device which presents itself over a USB |
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> > interface. |
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> |
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> Yes, and the device works for recording; the playing together with the |
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> other card (for output) is the problem, which I believe is a matter of |
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> having an appropriate .asoundrc (the syntax of which beats me) |
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|
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OK, have a look at the end of this message for an example. |
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|
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|
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> > If an application like vlc allows you to get audio output by |
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> > switching devices, then you know you will have to change the order of your |
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> > cards as they are detected by the kernel. |
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> |
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> the kernel consistently detects the MO card and the USB card in the |
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> same order (MO: card 0, USB: card 1). |
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> |
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> > QUESTION: I am not familiar with your hardware, but is dmesg *only* |
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> > identifying it as a USB device? I'm asking this because you may need to |
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> > additionally configure e.g. a serial/parallel interface to the device for |
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> > controlling it, or at least adding yourself to some user group, if USB |
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> > alone won't suffice. |
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> |
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> [ 726.441114] input: Burr-Brown from TI USB Audio CODEC |
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> as |
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> /devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.3/0003:08BB:2902.0005/inp |
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> ut/input21 [ 726.492970] hid-generic 0003:08BB:2902.0005: input,hidraw3: |
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> USB HID v1.00 Device [Burr-Brown from TI USB Audio CODEC ] on |
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> usb-0000:00:14.0-10/input3 |
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> [ 726.493002] usb 1-10: authorized to connect |
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> |
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> |
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> I'm in the group "audio" and the permissions of /dev/snd/* are right (0660) |
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|
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Not relevant, but if the RCA is detected as a serial modem or what not, you |
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may need to also be in dialup group. |
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|
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|
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> > > > I don't have a .asoundrc file. Contents of /etc/alsa/conf.d/ are not |
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> > > > customized. |
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> > |
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> > OK, this is noteworthy, you may need to do some tweaking in such a file, |
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> > depending which audio card is detected first and what controls are made |
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> > available. |
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> > |
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> > > > sysdefault:CARD=PCH |
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> > |
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> > OK, this shows your audio card on the MoBo is picked up by default as the |
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> > first card. |
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> > |
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> > > > HDA Intel PCH, Generic Analog |
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> > > > Default Audio Device |
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> > > > |
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> > > > front:CARD=PCH,DEV=0 |
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> > > > |
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> > > > HDA Intel PCH, Generic Analog |
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> > > > Front speakers |
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> > > > |
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> > > > usbstream:CARD=PCH |
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> > > > |
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> > > > HDA Intel PCH |
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> > > > USB Stream Output |
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> > > > |
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> > > > sysdefault:CARD=CODEC |
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> > |
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> > This is what you want to configure as the default audio device. |
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> |
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> Only for capturing, not for playing! |
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|
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Apologies, I had misunderstood what you're after. |
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|
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|
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> > In the first instance create a new file (for system-wide settings): |
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> > /etc/asound.conf. |
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> > |
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> > Add in it: |
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> > |
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> > defaults.pcm.card 1 |
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> > defaults.pcm.device 0 |
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> > defaults.ctl.card 1 |
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> > |
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> > which hopefully will make your second card configured to be the default. |
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> |
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> But that will make the USB card the default for both input and output. |
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> The USB card should take care of the input (microphone) and the MB |
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> card should deal with the output (digital signal sent to external |
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> DAC/amplifier via toslink cable). |
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> |
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> > More detailed settings and tweaking can be found here: |
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> > |
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> > https://www.alsa-project.org/main/index.php/Asoundrc |
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> |
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> I know that page. It doesn't give a hint about how set defaults with |
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> input and output through different cards. |
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> |
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> Thanks |
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> |
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> Jorge |
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|
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OK, I believe you need to use the "asym" alsa plugin to combine input from one |
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card and output through another. I have not used this before - I'd probably |
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opt for jackd instead. Some experimentation may be necessary to get the |
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manual setup as you want it. Have a look at this page: |
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|
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https://github.com/opensrc/alsa/blob/master/lib/md/Asym.md |
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|
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Essentially, you define two cards, for two different functions, then use the |
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asym plugin to combine them. Something like this? |
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|
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# Specify the MoBo card as the default |
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pcm.!default { |
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type hw |
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card PCH |
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} |
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|
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# Retain controls on this card for alsamixer and applications |
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ctl.!default { |
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type hw |
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card PCH |
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} |
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|
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# Now the USB device |
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ctl.!USB{ |
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type hw |
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card CODEC |
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format "S16_LE" |
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channels 1 |
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rate 44100 |
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#more options here |
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} |
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|
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# Join the I/O devices |
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pcm.duplex{ |
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type asym |
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playback.pcm "default" |
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capture.pcm "USB" |
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} |
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|
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See how the above works and consult the asym page for further tweakerage. |