Audio clipping

[JimZAH]

I'm running Allstar manually built from master branch.

This is running on a base station repeater running at home. There is a noticeable audio artifact which sounds like users are underwater. This appears to be from the receiver side of the system, users over the network sound fine.

I've tried everthing I can think of, jitter buffer, rebuilding without debug flags. Nothing seems to improve it.

It's a very similar issue the Raspberry PI's had which I believe was a timing issue?

[KB4MDD]

Did you recompile dahdi with dahdi_dummy?

The instructions at https://wiki.allstarlink.org/wiki/Dahdi_dummy are not exactly right for the current release because of the version number changes.

[JimZAH]

Ah,

I used the phreaknet script install listed here: https://allstarlink.github.io/developers/source-install/

It appears I don't have the Dahdi Dummy module.

root@debian:/home/jim# lsmod |grep dahdi
dahdi_transcode        16384  0
dahdi                 258048  1 dahdi_transcode

Assuming I still need the Dahdi dummy module?

[KB4MDD]

I recommend that it be installed. Some systems need the benefit of the timing module in dahdi.

[JimZAH]

Thanks Danny.

I'll give that a go.

On 23 July 2024 21:02:25 BST, Danny Lloyd @.***> wrote:

I recommend that it be installed. Some systems need the benefit of the timing module in dahdi.

-- Reply to this email directly or view it on GitHub: https://github.com/AllStarLink/app_rpt/issues/369#issuecomment-2246201681 You are receiving this because you authored the thread.

Message ID: @.***>

[JimZAH]

I'm confused.

It appears the dahdi_dummy module is part of the phreaknet install, unless I'm missing something. Here's the info output of the dahdi module:

root@debian:/usr/src/app_rpt# modinfo dahdi
filename:       /lib/modules/6.1.0-23-amd64/dahdi/dahdi.ko
alias:          dahdi_dummy
license:        GPL v2
description:    DAHDI Telephony Interface
author:         Mark Spencer <markster@digium.com>
version:        3.4.0
srcversion:     C775BF74A6596D0E788C181
depends:        
retpoline:      Y
name:           dahdi
vermagic:       6.1.0-23-amd64 SMP preempt mod_unload modversions 
parm:           initdir:deprecated, should use <tools_rootdir>/usr/share/dahdi (charp)
parm:           tools_rootdir:root directory of all tools paths (default /) (charp)
parm:           debug:Sets debugging verbosity as a bitfield, to see general debugging set this to 1. To see RBS debugging set this to 32 (int)
parm:           deftaps:int
parm:           max_pseudo_channels:Maximum number of pseudo channels. (int)
parm:           hwec_overrides_swec:When true, a hardware echo canceller is used instead of configured SWEC. (int)
parm:           auto_assign_spans:If 1 spans will automatically have their children span and channel numbers assigned by the driver. If 0, user space will need to assign them via /sys/bus/dahdi_devices. (int)

Note the alias is dahdi_dummy.

[KB4MDD]

In the cli type dahdi show status

Do you see dahdi dummy listed.

[JimZAH]

I'm afraid it appears the command dahdi doesn't exist. I do however have the following options:

root@debian:/home/jim# dahdi_
dahdi_cfg                       dahdi_span_assignments
dahdi_genconf                   dahdi_span_types
dahdi_hardware                  dahdi_speed
dahdi_maint                     dahdi_test
dahdi_monitor                   dahdi_tool
dahdi_registration              dahdi_waitfor_span_assignments
dahdi_scan                      

[jxmx]

Even if you want to compile directly, I would strongly suggest using the ASL3 Repo and install the dahdi-source and dahdi-dkms packages. That will ensure that Dadhi is running on a known-tested version and will survive Kernel updates.

Also, what is the underlying hardware? I assume Debian 12 x86_64?

[KB4MDD]

The command would need to be run at the asterisk prompt.

[JimZAH]

@KB4MDD Sorry, I assumed the wrong CLI.... It appears to list nothing much at all:

debian*CLI> dahdi show status
Span Description                              Alarms  IRQ    bpviol CRC    Fra Codi Options  LBO

[JimZAH]

@jxmx Thank you, I'll give that a go.

The hardware is X86_64 5 year old i5 laptop.

[JimZAH]

Thanks both, I've managed to get this working. For anyone else who has issues installing from source please try the below.

1. Add the ASL3 repository as per the documentation.
2. Install dahdi-source and dahdi-dkms.
3. Run the phreaknet install like so phreaknet install -d -v 20 -f note '-f'.

This should get you up and running with dahdi_dummy.

CLI output:

debian*CLI> dahdi show status
Span Description                              Alarms  IRQ    bpviol CRC    Fra Codi Options  LBO
   1 DAHDI_DUMMY/1 (source: HRtimer) 1        UNCONFI 0      0      0      CAS Unkn          0 db (CSU)/0-133 feet (DSX-1)

lsmod output:

root@debian:/usr/src# lsmod | grep dah
dahdi_dummy            16384  0
dahdi_transcode        16384  0
dahdi                 258048  18 dahdi_dummy,dahdi_transcode