SPDIF to 5.1 software loop decoder. Use if you want to connect a digital surround signal (Dolby Digital), such as an Xbox 360 S or TV, via your PC to your 5.1 (analog) stereo. Like a digital receiver/decoder, just in software.

FFMPEG is licenced under the GNU Lesser General Public License version 2.1 and so is this piece of software.

• libasound2-dev
• libao-dev
• cmake
• ffmpeg from Source https://www.ffmpeg.org/download.html (tested with 4.3.1)

./configure --enable-shared --disable-static --disable-everything --enable-demuxer=spdif --enable-decoder=ac3 --enable-indev=alsa
make

Prepare CMakeLists.txt - set FFMPEG Var with Path to ffmpeg (if not in ../ffmpeg-4.3.1)

cmake .
make

I run it like this:

./spdif-decoder -i hw:CARD=Device -d pulse -o alsa_output.usb-0d8c_USB_Sound_Device-00-Device.analog-surround51

Alsa's hw:CARD=Device is my SPDIF input. You can list your alsa devices with

aplay -l

I had to use amixer to set the capture source to SPIF. In this case Device is the alsa name of my SPDIF-in card:

amixer -c Device scontrols                   # show controls
amixer -c Device get 'PCM Capture Source'    # show options
amixer -c Device set 'PCM Capture Source' 'IEC958 In'    # set input

Sebastian Morgenstern Sebastian.Morgenstern@gmail.com Simon Schubert 2@0x2c.org