8 channel LPCM over HDMI, It's Multi Amp for Everyone

[tschanrm]

Excellent work Koon! Is there a way to get this working so you could stream any audio source in? For instance, I have two sound cards. One soundcard takes any external audio - analog signal/digital signal, and sends an SPDIF signal to the second sound card. The second sound card applies realitime FIR crossover and channel delay to that incoming S/PDIF signal. So, in essence, I can listen to anything realtime - TV, sports, movies, and of course music., I just need to hook it up to the first sound card.

[KOON3876]

Hi tschanrm, actually I don't have full knowledge of multimedia streaming, but it will be convenient.

(1) Output stream : I don't have to keep huge 8 channel wave file.
(2) Input stream : selectable for stored WAV file, or external input.

I wonder there should be many "multimedia programmer" skilled than me but no contact or feedback yet.

Maybe stream handling will be difficult than file handling, but sometime I hope to study / implement....

[soundcheck]

Hi folks.

When it comes to routing flexibility Linux respectively ALSA lets you do quite some weired stuff:

http://alsa.opensrc.org/SurroundSound

The questions remains if I can address and send data over HDMI Tx ch0 to RX ch0, Tx ch1 to Rx ch1 asf. And on the Rx side map Rx0 to Amp0, RX1 to Amp1....

@Thomaseliot: There you can also read how to route from stereo .wav to multichannel.

Cheers

[KOON3876]

I uploaded test tone wave file, to make it easy to test your environment can play 8channel audio.
CH1,2,3,4,5,6,7,8 = { 200, 400,600,800,1000,1200,1400,1600 Hz}

Playing in Loop mode, attaching single speaker to each speaker terminal of AV Amplifier.. easy to check 8 channel is played or not.

and source code to make this wave file is also available.

http://koonlab.com/MultiAmpForEveryo...DMI_AVAMP.html

[soundcheck]

BTW:

Auzentech and Asus coming up with 8*LPCM over HDMI PCI soundcards.

http://www.bit-tech.net/hardware/200...tex-2008-psp/1

http://www.xpmediacentre.com.au/comm...by-truehd.html

[phofman]

The wonderful audio Swiss Army knife SoX http://sox.sourceforge.net/ provides LOTS of functions, among them merging audio files to create multitrack outputs. Works fine on windows too. You may find it useful just as I did And btw writing a new effect module is pretty simple, sox just passes x-dimensional arrays of long ints, all the format conversions and the other stuff taken care of.

[soundcheck]

Koons fir-engine output could be piped realtime into Sox, which outputs the multichannel-wav over HDMI?
Is this your idea with Sox?

[phofman]

Well, I do not know about piping multiple streams through sox on windows (I guess not feasible), I think Koons FIR engine produces multichannel output directly.

[soundcheck]

Koon is using a multichannel .wav and not mutiple streams as far as I understood.

[fb]

Perhaps an ideal solution would be

Audio app -> Jack -> Koon's FIR engine -> Jack -> HDMI out

Jack is available for Windows and OSX now as well as linux. I wonder if Koon's FIR engine is suitable for realtime processing of streams? Possibly it could be ported to Linux and OSX as well.