Hardinfo report:
Found these lines from unix.stackexchange.-PCI Devices-
Host bridge : NVIDIA Corporation MCP79 Host Bridge
RAM memory : NVIDIA Corporation MCP79 Memory Controller
ISA bridge : NVIDIA Corporation MCP79 LPC Bridge
RAM memory : NVIDIA Corporation MCP79 Memory Controller
SMBus : NVIDIA Corporation MCP79 SMBus
RAM memory : NVIDIA Corporation MCP79 Memory Controller
Co-processor : NVIDIA Corporation MCP79 Co-processor
USB controller : NVIDIA Corporation MCP79 OHCI USB 1.1 Controller
USB controller : NVIDIA Corporation MCP79 EHCI USB 2.0 Controller
USB controller : NVIDIA Corporation MCP79 OHCI USB 1.1 Controller
USB controller : NVIDIA Corporation MCP79 EHCI USB 2.0 Controller
Audio device : NVIDIA Corporation MCP79 High Definition Audio
PCI bridge : NVIDIA Corporation MCP79 PCI Bridge
Ethernet controller : NVIDIA Corporation MCP79 Ethernet
IDE interface : NVIDIA Corporation MCP79 SATA Controller
PCI bridge : NVIDIA Corporation MCP79 PCI Express Bridge
PCI bridge : NVIDIA Corporation MCP79 PCI Express Bridge
PCI bridge : NVIDIA Corporation MCP79 PCI Express Bridge
PCI bridge : NVIDIA Corporation MCP79 PCI Express Bridge
VGA compatible controller : NVIDIA Corporation C79 [GeForce 9200M G]
Ethernet controller : Atheros Communications Inc. AR242x / AR542x Wireless Network Adapter
Mass storage controller : VIA Technologies, Inc. Device 401a
SD Host controller : VIA Technologies, Inc. Device 401b
Added the lines to
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/etc/pulse/default.pa
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load-module module-alsa-sink device=hw:0,0
#load-module module-alsa-sink device=hdmi:0
load-module module-combine-sink sink_name=combined
set-default-sink combined
/var/lib/alsa and /etc/alsa are empty. No config. files there. Raed the manpage for alsa. The format is :
alsactl [options] [store|restore|init] <card # or id or device>
My card from alsamixer is
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0 HDA NVidia
So the command from root should be
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alsactl store 0
Got the following file:
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/var/lib/alsa/asound.state
How could a detailed report by alsactl be generated into a text file? I have the following config files in
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/proc/asound
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dr-xr-xr-x 4 root root 0 Sep 7 12:09 card0
-r--r--r-- 1 root root 0 Sep 7 12:09 cards
-r--r--r-- 1 root root 0 Sep 7 12:09 devices
lrwxrwxrwx 1 root root 5 Sep 7 12:09 NVidia -> card0
dr-xr-xr-x 2 root root 0 Sep 7 12:09 oss
-r--r--r-- 1 root root 0 Sep 7 12:09 pcm
dr-xr-xr-x 2 root root 0 Sep 7 12:09 seq
-r--r--r-- 1 root root 0 Sep 7 12:09 timers
-r--r--r-- 1 root root 0 Sep 7 12:09 version
There are posts found with the search parameters: "duplex playback recording"
+duplex +playback +recording]
There are many. But the relevant ones are the following:
(1) PulseAudio loopback guide
A lengthy, but awesome guide, my ultimate guide, I guess. But I am not trying to learn so much on this issue. Looking for a simpler solution, if any.
This guy, an advanced programmer, had just three posts, and then ... silence. Vanished into the underbellies of a Multinational Software Company, perhaps. Last seen in 2014. So the gifted and hallowed individual can't be accessed any longer, I guess.
(2) alsa: can record but can't echo input
Received no reply.
(3) Debian 8, no sound, Realtek ALC1150
Received replies, but the problem wasn't solved.
Now moving towards our final target step by step:
1st:
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sudo modinfo snd-aloop
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filename: /lib/modules/3.9.6/kernel/sound/drivers/snd-aloop.ko
license: GPL
description: A loopback soundcard
author: Jaroslav Kysela <perex@perex.cz>
depends:
intree: Y
vermagic: 3.9.6 SMP preempt mod_unload modversions 486
parm: index:Index value for loopback soundcard. (array of int)
parm: id:ID string for loopback soundcard. (array of charp)
parm: enable:Enable this loopback soundcard. (array of bool)
parm: pcm_substreams:PCM substreams # (1-8) for loopback driver. (array of int)
parm: pcm_notify:Break capture when PCM format/rate/channels changes. (array of int)
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sudo aplay -l
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**** List of PLAYBACK Hardware Devices ****
card 0: NVidia [HDA NVidia], device 0: ALC268 Analog [ALC268 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
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sudo modprobe snd-aloop
followed by:
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aplay -l
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**** List of PLAYBACK Hardware Devices ****
card 0: NVidia [HDA NVidia], device 0: ALC268 Analog [ALC268 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: Loopback [Loopback], device 0: 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
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
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sudo modprobe snd-aloop
3rd:
Again
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sudo alsactl store
Now we have to be careful. The help pages on the web are very ancient. For example, the suggestion in Matrix:Module-aloop with the code:
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modinfo soundcore
The pdf file of Jens Getreu thrown up by Google Search, is based on the above ancient webpage!
And I finally reach the Debian Wiki page on audio loopback with alsa!
It was lying there, all the time! When I posted this query: To grab the output from a code to a wave file?
But I couldn't have known about this file without the learning curve that I overcame only today, the 7th Aug 2018. This scenario perhaps depicts the sad fate of FOSS — diamonds strewn everywhere, but no one knows their utility except in jewelry.
Installed the other required software:
pavucontrol_1.0-1_i386.deb
pasystray_0.4.0-1_i386.deb
I am now trying to figure out how to use a part of the audio output to Loopback recording.
Now here is my final query:
Could this page be explained with a simple Sound Recorder application rather than Gnome_Record_My_Desktop please?
Yes, it is very simple with PAVUcontrol. PASYstray is not required. In the Output Device Tab of pavucontrol, activate and couple all devices except the system beeps.
Use Gnome Sound Recorder and begin recording. This is IMPORTANT.
As soon as a recorder is ON, the recording tab of pavucontrol begins to show the recorder action. Not Before.
So the steps are:
(1) Just the Built-in Audio Stereo and the Loopback Stereo needs to be coupled.
(2) Recorder needs to be recording.
Good day and happy recording.