Surround

It implements a virtual surround sound system and it was developed as part of the Component Based Softwared Design Course in the SSSUP-Pisa.

Requirements

1. Surround needs the loopback of ALSA, that's why snd-aloop module has to be enabled:

$ sudo modprobe snd-aloop

2. Select pulseaudio's output the snd-aloop that might have the following name "Analogue Output - Built-in Audio".

3. Identify the ALSA devices input devices, the loopback also counts as ALSA device:

$ arecord -l

Note the Loopback Card number with Device number 1.

4. Pick the desired card and device, you can identify it using

$ aplay -l

Compile

1. Run on terminal

$ make

2. launch with

$ bin/main <LOOPBACK DEVICE> <PLAYBACK DEVICE>

i.e.:

$ bin/main hw:3,1 hw:1,0

Compile with LATENCY MEASURE

1. Run on terminal

$ make CFLAGS=-DMEASURE_LATENCY

When launch bin/main, it will create a latency_micros.dat file with the average spent time for a certain number of samples read by alsa.