ALSA: Recording Playback Audio with HDA-Intel

Hello,
My alsa-info. I only use analog output.
Alsamixer looks like this: http://ompldr.org/vYmE4Mw http://ompldr.org/vYmE4NA
I would like to record audio which is being played back on my computer. I need it for recording of gameplay videos. I want to use only ALSA for this and want to avoid PulseAudio, if possible.
Recording audio playing on the computer with Alsamixer tells me that I should use the "Mix" control of the Capture device. However, HDA-Intel appears not to provide such a control.
Does anyone know how I can create such control? Or perhaps I can somehow fake a capture device, that in fact simply plays back the hw:0,0 playback device?
Perhaps the snd-aloop module is a solution.
I will now start reading about .asoundrc files but wanted to leave this question here, because I feel that I'm likely to fail in my search for knowledge.
Cheers

I can't see a straightforward way to configure icecast to do this on the Arch Wiki.
I tried alsaloop, but it blocks devices when in use. Maybe I'm doing it wrong.
alsaloop -C hw:0,0 -P hw:0,0 -t 10000
I'm not the first to have this problem (thread of 2010-05-22)
I managed to get play-to-file working but ffmpeg doesn't seem to be able to handle the raw output and I'd have to make "default" play to file, as most games don't allow to set what alsa device to use for sound.

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If this information would be helpful, I use alsamixer and "aplay -l" gives the following:
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC663 Analog [ALC663 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 1: ALC663 Digital [ALC663 Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: Loopback [Loopback], device 0: Loopback PCM [Loopback PCM]
Subdevices: 7/8
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
Subdevice #2: subdevice #2
Subdevice #3: subdevice #3
Subdevice #4: subdevice #4
Subdevice #5: subdevice #5
Subdevice #6: subdevice #6
Subdevice #7: subdevice #7
card 1: Loopback [Loopback], device 1: Loopback PCM [Loopback PCM]
Subdevices: 8/8
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
Subdevice #2: subdevice #2
Subdevice #3: subdevice #3
Subdevice #4: subdevice #4
Subdevice #5: subdevice #5
Subdevice #6: subdevice #6
Subdevice #7: subdevice #7
I can record from the microphone with with the command "recordmydesktop". I succeeded in recording the internal audio with audacity by choosing the device "looprec" for recordings. I'm not sure why RecordMyDesktop gives an error while Audacity does not. Below is my ~/.asoundrc, which I copied from the aforementioned thread. I am not knowledgeable, but I guess there is a mistake in it? Would you please assist me solving this error? Thank you for your time.
pcm.!default {
type asym
playback.pcm "LoopAndReal"
#capture.pcm "looprec"
capture.pcm "hw:0,0"
pcm.looprec {
type hw
card "Loopback"
device 1
subdevice 0
pcm.LoopAndReal {
type plug
slave.pcm mdev
route_policy "duplicate"
pcm.mdev {
type multi
slaves.a.pcm pcm.MixReale
slaves.a.channels 2
slaves.b.pcm pcm.MixLoopback
slaves.b.channels 2
bindings.0.slave a
bindings.0.channel 0
bindings.1.slave a
bindings.1.channel 1
bindings.2.slave b
bindings.2.channel 0
bindings.3.slave b
bindings.3.channel 1
pcm.MixReale {
type dmix
ipc_key 1024
slave {
pcm "hw:0,0"
rate 48000
#rate 44100
periods 128
period_time 0
period_size 1024 # must be power of 2
buffer_size 8192
pcm.MixLoopback {
type dmix
ipc_key 1025
slave {
pcm "hw:Loopback,0,0"
rate 48000
#rate 44100
periods 128
period_time 0
period_size 1024 # must be power of 2
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Last edited by rayanamukami (2014-07-05 14:05:20)

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Last edited by walkyrie (2012-06-02 13:22:49)

This seems pretty similar to my issue... No sound from my from headphone output at all... I do get sound from the rear output BUT it stops when I plug in the front one!
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======================================
Diff for codec 0/2 (0x11060441):
+++
@@ -220,17 +220,16 @@
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Unsolicited: tag=0x02, enabled=1
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Connection: 1
0x18
Node 0x25 [Pin Complex] wcaps 0x40058d: Stereo Amp-Out
Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
Amp-Out vals: [0x80 0x80]
Pincap 0x0000001c: OUT HP Detect
======================================
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======================================
Diff for codec 0/2 (0x11060441):
+++
@@ -220,16 +220,17 @@
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Unsolicited: tag=0x02, enabled=1
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Connection: 1
0x18
Node 0x25 [Pin Complex] wcaps 0x40058d: Stereo Amp-Out
Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
Amp-Out vals: [0x80 0x80]
Pincap 0x0000001c: OUT HP Detect
======================================
Not a lot of difference, but enough to see that the system sees the event...
Now I need to know what to do to make sure the sound starts on the front headphone output when the rear one is disconnected, or if they are parallel, not have the sound stop ;-)

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[root@archeee ~]# aplay -l
**** List of PLAYBACK Hardware Devices ****
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http://www.productwiki.com/asus-eeebox-pc-eb1006/
Things I checked :
done a alsamixer and seleted HDA ATI HDMI, enabled sound with the m key
┌───────────────────────────── AlsaMixer v1.0.22 ────────
│ Card: HDA ATI HDMI F1: Help
│ Chip: ATI R6xx HDMI F2: System information
│ View: F3:[Playback] F4: Capture F5: All F6: Select sound card
│ Item: S/PDIF Esc: Exit
│
│
│
│
│
│
│
│ ┌──┐
│ │OO│
│ └──┘
│ < S/PDIF >
│
I've readed a lot of thread with the ATI HDMI sound probleme, and my config seems good, but still there is no sound.
Last edited by drev (2010-02-26 17:17:10)

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For any interested parties, my alsa mixer screen looks something like this as well:
──────────────────────────── AlsaMixer v1.0.24.2 ─────────────────────────────
Card: HD-Audio Generic F1: Help
Chip: ATI R6xx HDMI F2: System information
View: F3:[Playback] F4: Capture F5: All F6: Select sound card
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┌──┐
│OO│
└──┘
< S/PDIF >
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bump...

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