Audio Configuration

Prerequisites

1. Audio cable setup
2. Device's ID:
• iOS: vendor ID
• Android: serial number

Audio Cable Setup

An audio cable connected from a device’s head phone jack to any of the following:

• Mac Mini’s audio-in port
• Input jack on an audio interface

Audio Channels

Setting audio channels is necessary for devices that present each input as a separate channel or to use the left and right channel of the built-in audio for separate devices.

Channel numbers can be found by looking at the physical port-in jack of an audio interface, but because channel numbers are zero-indexed, channel 1 on an audio interface is channel 0 in FFmpeg.

Configuration Setting

If this is the first time configuring audio settings, create an audio.ini file with a [Map] section stored in /usr/local/deviceconnect/data/.

Within the [Map] section of audio.ini, there are two INI key settings to enable audio configuration:

• Device’s ID with FFmpeg’s device number:

  
     device ID=<ffmpeg device number>
      

• Device’s ID with FFmpeg’s device number and audio channel number:

  
      device ID=<FFmpeg device number, audio channel number>
      

For the Mac Mini audio-in port, the FFmpeg device number is the Built-in Input number found when running the following command in terminal:

   ffmpeg -v verbose -f avfoundation -list_devices true -i " "
    

Command output:

   AVFoundation input device @ 0x7faf8bc14880] AVFoundation video devices:
    [AVFoundation input device @ 0x7faf8bc14880] [0] Capture screen 0
    [AVFoundation input device @ 0x7faf8bc14880] AVFoundation audio devices:
    [AVFoundation input device @ 0x7faf8bc14880] [0] Built-in Input
    

Running this command when connecting to multiple devices may require some trial and error to determine which device number corresponds to the audio interface.

audio.ini Example

In audio.ini, to set iOS device with vendor ID ee3e3ef1ed46dd52c29a23e96223de648043c410 to FFmpeg device number 0 and Android device with serial number 3630B9C1635A00EC to FFmpeg device number 1 and audio channel 3:

   [Map]
   ee3e3ef1ed46dd52c29a23e96223de648043c410=0
   3630B9C1635A00EC=1,3
    

Restarting GigaFox Services

After creating or modifying audio.ini, GigaFox services must be restarted.

Audio Playback Troubleshooting

Volume Checks

The device not be muted and the volume must be set to the highest setting

Common volume settings: