Re: [Alsa-user] aplay -l doesn't see my loopback sound card using snd_aloop

2020-09-07 Thread Jeff Tchang 
> >    WARNING   ***
> > Warning! aplay uses ALSA emulation instead of the native OSS API
>
> This message shows that your system is set up to use not the ALSA
> kernel drivers but the OSS drivers.
>
> > I have an embedded system with a custom kernel.
>
> Are you paying someone for support?  Or did you build it yourself?

Not paying anyone for support. I managed to figure it out though.

There seems to be some sort of issue when I load a v4l2rtspserver that
utilizes the LIVE 555 library.
I believe it might have been claiming the loopback device or something
along those lines. When I changed the order in which I started some of
the programs aplay -l started showing the device. Still not entirely
sure what might have been the cause here.

Thank you.


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Re: [Alsa-user] aplay -l doesn't see my loopback sound card using snd_aloop

2020-09-07 Thread Clemens Ladisch via Alsa-user 
Jeff Tchang wrote:
>    WARNING   ***
> Warning! aplay uses ALSA emulation instead of the native OSS API

This message shows that your system is set up to use not the ALSA
kernel drivers but the OSS drivers.

> I have an embedded system with a custom kernel.

Are you paying someone for support?  Or did you build it yourself?


Regards,
Clemens


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[Alsa-user] aplay -l doesn't see my loopback sound card using snd_aloop

2020-09-06 Thread Jeff Tchang 
I have an embedded system with a custom kernel. I have built snd_aloop as a
kernel module and am able to load it. However aplay -l or aplay -L does not
show any devices. However the loopback device is showing up in
/proc/asound/cards so I am wondering what could be the problem.

Details:

# uname -a
Linux openmiko 3.10.14 #7 PREEMPT Sat Sep 5 21:33:15 UTC 2020 mips GNU/Linux

# aplay --version

aplay: version 1.1.0 by Jaroslav Kysela 


I see the loopback card:

# cat /proc/asound/cards
 3 [Loopback   ]: Loopback - Loopback
  Loopback 1

But aplay -l gives me nothing:

# aplay -l


   WARNING   ***
Warning! aplay uses ALSA emulation instead of the native OSS API


aplay: device_list:268: no soundcards found...
#

# lsmod
Module  Size  Used byTainted: G
snd_aloop  12002  0
snd_pcm68453  1 snd_aloop
snd_page_alloc  3810  1 snd_pcm
snd_timer  18670  1 snd_pcm
snd39168  3 snd_aloop,snd_pcm,snd_timer
v4l2loopback   22369  2
sensor_jxf239136  1
tx_isp337860  3
sinfo  12972  0
#

More details:

# cat /proc/asound/
Loopback/  cards  modulestimers
card3/ devicespcmversion
# cat /proc/asound/pcm
03-00: Loopback PCM : Loopback PCM : playback 2 : capture 2
03-01: Loopback PCM : Loopback PCM : playback 2 : capture 2
# cat /proc/asound/modules
 3 snd_aloop
# cat /proc/asound/devices
 33:: timer
 96: [ 3]   : control
112: [ 3- 0]: digital audio playback
113: [ 3- 1]: digital audio playback
120: [ 3- 0]: digital audio capture
121: [ 3- 1]: digital audio capture


My goal is to read from /dev/dsp (OSS legacy) and output it to the loopback
device so a program that only uses ALSA can have audio. I plan to use
ffmpeg. Ffmpeg does not see the hardware either.

I have tried variations of:

ffmpeg -f oss -i /dev/dsp -codec:a pcm_s16le -f alsa hw:3,0
ffmpeg -f oss -i /dev/dsp -codec:a pcm_s16le -f alsa hw:3,1

I tried poking around in the kernel sources but no real smoking gun. The
vendor has their own sound device drivers. Is it possible it is somehow
interfering with getting a full device list?
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