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 <pe...@perex.cz> 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 by Tainted: G snd_aloop 12002 0 snd_pcm 68453 1 snd_aloop snd_page_alloc 3810 1 snd_pcm snd_timer 18670 1 snd_pcm snd 39168 3 snd_aloop,snd_pcm,snd_timer v4l2loopback 22369 2 sensor_jxf23 9136 1 tx_isp 337860 3 sinfo 12972 0 # More details: # cat /proc/asound/ Loopback/ cards modules timers card3/ devices pcm version # 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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