• Play mp3 in command line
  • Packages - alsa alsa-lib
  • Only root can read the audio device - Add regular user to “audio” group
  • Volume control - “alsamixer”, left/right, up/down to adjust the volume
  • Play mp3 in command line - ffplay from ffmpeg, play from sox with libsox-fmt-mp3

    $ ffplay file.mp3
    $ play file.mp3

• Play sound through digital output - SPDIF
  • List playback devices

    $ aplay -l
    **** List of PLAYBACK Hardware Devices ****
    card 0: PCH [HDA Intel PCH], device 0: ALC892 Analog [ALC892 Analog]
      Subdevices: 1/1
      Subdevice #0: subdevice #0
    card 0: PCH [HDA Intel PCH], device 1: ALC892 Digital [ALC892 Digital]
      Subdevices: 1/1
      Subdevice #0: subdevice #0
    card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
      Subdevices: 1/1
      Subdevice #0: subdevice #0
    card 0: PCH [HDA Intel PCH], device 7: HDMI 1 [HDMI 1]
      Subdevices: 1/1
      Subdevice #0: subdevice #0
    
    $ cat /proc/asound/devices
      1:        : sequencer
      2: [ 0- 7]: digital audio playback
      3: [ 0- 3]: digital audio playback
      4: [ 0- 2]: digital audio capture
      5: [ 0- 1]: digital audio playback
      6: [ 0- 0]: digital audio playback
      7: [ 0- 0]: digital audio capture
      8: [ 0- 3]: hardware dependent
      9: [ 0- 2]: hardware dependent
     10: [ 0]   : control
     33:        : timer
    
    //device 0,1 is the digital output.

  • Unmute the S/PDIF, run “alsamixer”, switch to “S/PDIF”, press “m”.
  • “play” “ffplay” mp3 should work.
  • Play raw sound specifying the device.

    $ aplay -D plughw:0,1 ./woman.wav

* http://alsa.opensrc.org/DigitalOut