☰

Alsa snd-aloop 内核模块适用于 16.04 或 14.04 服务器吗？

tag-icon • tag-icon sound alsa
Alsa snd-aloop 内核模块适用于 16.04 或 14.04 服务器吗？

我试图使用 FFmpeg 从服务器上的应用程序录制音频。显然，我需要一个 Alsa 环回驱动程序。我读到这应该可以在 Ubuntu 14.04 上运行：

modprobe snd-aloop

不幸的是，我的内核不支持这个功能：

modprobe：严重错误：未找到模块 snd-aloop。

这是 Ubuntu 服务器和桌面发行版之间的区别吗？

我如何安装该驱动程序？

谷歌搜索让我找到了这里： https://wiki.ubuntu.com/Audio/InstallingLinuxAlsaDriverModules

然后该页面说我需要去这里： https://wiki.ubuntu.com/Audio/UpgradingAlsa

该页面明智地建议使用 DKMS： https://wiki.ubuntu.com/Audio/UpgradingAlsa/DKMS

但是，DKMS 说明仅列出了英特尔驱动程序： https://code.launchpad.net/~ubuntu-audio-dev/+archive/ubuntu/alsa-daily/+packages

我是否遗漏了什么？

答案1

  • 好吧，我可以尝试在 Ubuntu 16.04 桌面版（VirtualBox 禁用了声卡）中加载它。如您所见，它已安装linux-image-extra您可能尚未安装的软件包。

    ~$ modinfo snd-aloop

filename:       /lib/modules/4.4.0-42-generic/kernel/sound/drivers/snd-aloop.ko
license:        GPL
description:    A loopback soundcard
author:         Jaroslav Kysela <[email protected]>
srcversion:     0A4CE16C028DAB4BC8260D3
depends:        snd-pcm,snd
intree:         Y
vermagic:       4.4.0-42-generic SMP mod_unload modversions 
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)

~$ dpkg -S /lib/modules/4.4.0-42-generic/kernel/sound/drivers/snd-aloop.ko

linux-image-extra-4.4.0-42-generic: /lib/modules/4.4.0-42-generic/kernel/sound/drivers/snd-aloop.ko

~$ sudo modprobe snd-aloop
~$ alsa-info.sh --stdout

upload=true&script=true&cardinfo=
!!################################
!!ALSA Information Script v 0.4.64
!!################################

!!Script ran on: Thu Mar 23 10:28:23 UTC 2017


!!Linux Distribution
!!------------------

Ubuntu 16.04 LTS \n \l DISTRIB_ID=Ubuntu DISTRIB_DESCRIPTION="Ubuntu 16.04 LTS" NAME="Ubuntu" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu 16.04 LTS" HOME_URL="http://www.ubuntu.com/" SUPPORT_URL="http://help.ubuntu.com/" BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/" UBUNTU_CODENAME=xenial


!!DMI Information
!!---------------

Manufacturer:      innotek GmbH
Product Name:      VirtualBox
Product Version:   1.2
Firmware Version:  VirtualBox


!!Kernel Information
!!------------------

Kernel release:    4.4.0-42-generic
Operating System:  GNU/Linux
Architecture:      x86_64
Processor:         x86_64
SMP Enabled:       Yes


!!ALSA Version
!!------------

Driver version:     k4.4.0-42-generic
Library version:    1.1.0
Utilities version:  1.1.0


!!Loaded ALSA modules
!!-------------------

snd_aloop


!!Sound Servers on this system
!!----------------------------

Pulseaudio:
      Installed - Yes (/usr/bin/pulseaudio)
      Running - Yes


!!Soundcards recognised by ALSA
!!-----------------------------

 0 [Loopback       ]: Loopback - Loopback
                      Loopback 1


!!PCI Soundcards installed in the system
!!--------------------------------------



!!Advanced information - PCI Vendor/Device/Subsystem ID's
!!-------------------------------------------------------



!!Modprobe options (Sound related)
!!--------------------------------

snd_pcsp: index=-2
snd_usb_audio: index=-2
snd_atiixp_modem: index=-2
snd_intel8x0m: index=-2
snd_via82xx_modem: index=-2
snd_atiixp_modem: index=-2
snd_intel8x0m: index=-2
snd_via82xx_modem: index=-2
snd_usb_audio: index=-2
snd_usb_caiaq: index=-2
snd_usb_ua101: index=-2
snd_usb_us122l: index=-2
snd_usb_usx2y: index=-2
snd_cmipci: mpu_port=0x330 fm_port=0x388
snd_pcsp: index=-2
snd_usb_audio: index=-2


!!Loaded sound module options
!!---------------------------

!!Module: snd_aloop
    enable : Y,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N
    id : (null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null),(null)
    index : -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
    pcm_notify : 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
    pcm_substreams : 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8


!!ALSA Device nodes
!!-----------------

crw-rw----+ 1 root audio 116,  2 Mar 23 11:18 /dev/snd/controlC0
crw-rw----+ 1 root audio 116,  4 Mar 23 11:18 /dev/snd/pcmC0D0c
crw-rw----+ 1 root audio 116,  3 Mar 23 11:18 /dev/snd/pcmC0D0p
crw-rw----+ 1 root audio 116,  6 Mar 23 11:18 /dev/snd/pcmC0D1c
crw-rw----+ 1 root audio 116,  5 Mar 23 11:18 /dev/snd/pcmC0D1p
crw-rw----+ 1 root audio 116,  1 Mar 23 11:18 /dev/snd/seq
crw-rw----+ 1 root audio 116, 33 Mar 23 11:18 /dev/snd/timer

/dev/snd/by-path:
total 0
drwxr-xr-x 2 root root  60 Mar 23 11:18 .
drwxr-xr-x 3 root root 200 Mar 23 11:18 ..
lrwxrwxrwx 1 root root  12 Mar 23 11:18 platform-snd_aloop.0 -> ../controlC0


!!Aplay/Arecord output
!!--------------------

APLAY

**** List of PLAYBACK Hardware Devices ****
card 0: 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 0: 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

ARECORD

**** List of CAPTURE Hardware Devices ****
card 0: 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 0: 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

!!Amixer output
!!-------------

!!-------Mixer controls for card 0 [Loopback]

Card hw:0 'Loopback'/'Loopback 1'
  Mixer name    : 'Loopback Mixer'
  Components    : ''
  Controls      : 97
  Simple ctrls  : 1
Simple mixer control 'PCM',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 255
  Mono:
  Front Left: Playback 255 [100%] [0.00dB]
  Front Right: Playback 255 [100%] [0.00dB]
...

  • 对于一般的解决方案，请查看：

    如何找到提供文件的包？

  • 刚刚检查了全新的 Ubuntu 16.04.1 服务器。它有模块snd-aloop。linux-image-extra*软件包作为元软件包的依赖项安装，linux-image-generic而元软件包也是linux-generic元软件包的依赖项。因此，快速修复：

    sudo apt install linux-generic

答案2

SK Venkat 的这个答案对我有用。唯一的问题是 ls 命令必须在文件夹上运行：/lib/modules/$(uname -r)/kernel/sound/drivers

他漏掉了 drivers 末尾的 s。没有足够的代表来发表评论，因此在这里添加答案。

ls 没有显示 snd-aloop。正如他所建议的，下面的命令可以解决问题。

sudo apt install linux-modules-extra-$(uname -r)
sudo reboot

答案3

如果ls /lib/modules/$(uname -r)/kernel/sound/drivers没有列出，snd-aloop.ko则尝试以下命令来安装附加模块：

$ sudo apt install linux-modules-extra-$(uname -r)
$ sudo reboot

由于云提供商的 Linux 发行版默认没有某些模块，因此需要根据需要将其添加到我们的系统中。

重新启动后，尝试上面提到的相同 ls 命令，您将看到该snd-aloop.ko文件。

答案4

你能运行这个吗

alsactl restore -P

如果不能，你可以尝试安装

Ubuntu 服务器：安装 Alsa 声音和 MOC (Music On Console)

如果无法从 APT 安装，您可以尝试从源代码编译，按照这里

编译

如果没有其他方法，我建议阅读这个：

Jack 和 Loopback 设备作为 Alsa-to-Jack 桥接器

相关内容