Hello Mark, In fact, my project is an hardware decoder, based on PC architecture for the moment (with motherboard and power fanless). I have created my own audio format with lossless compression (3:1) and I would like to build an hardware decoder to connect him between my DVD player and my amplifier. I use the CD Audio structure, like CD-AC3 or CD-DTS, but with my own format in each track and not with the PCM structure. I can only use digital input and output to detect and decode my own audio stream, or maybe to detect and bypass audio stream like MPEG-2 multichannel, AC3 or DTS. I can build easilly hardware A/D converter or D/A converter. Maybe, if I mix my two channels in the right channel, "format" my stream in SPDIF structure, and installing an hardware A/D converter after the analog right output, do you you think I can virtually transform the analog right output in pseudo-SPDIF output ?
Many thanks, Christophe Fantoni French Technical Writer ----- Original Message ----- From: "Marc Santhoff" <[EMAIL PROTECTED]> To: "FPC-Pascal users discussions" <fpc-pascal@lists.freepascal.org> Sent: Friday, January 28, 2005 4:23 PM Subject: Re: [fpc-pascal] SPDIF > Am Fr, den 28.01.2005 schrieb Christophe Fantoni um 15:13: > > Hello again, > > > > I have found many pascal sources to interface the Sound Blaster compatible > > drivers, but only for the analog output/input. Nothing for the SPDIF or > > optical input/output. With sound card like SB Live! or SB Audigy, the DOS > > driver to interface DOS program exist... like the SPDIF input/output. But no > > program to use it (maybe DOS is too old, and programmers don't support this > > new feature in their old program) > > For me, the problem is to found the technicals informations explain how to > > include the digital output structure in the analog ouput sources coded in > > Pascal. For example, the SoundLib 2 library in > > http://www.crossfire-designs.de/index.php?lang=en&what=sourcecode&name=sl2.h > > tm , compatible vith FPC, Delphi and BP7, car easilly input and output sound > > stream but only in an analog way. No informations in the pascal code souce > > to structure and activate the digital input/output... Under Windows, this > > problem doesn't exist. Normal, the analog and digital input/out is managed > > by the Windows driver, and maybe by DirectX. But under DOS, the problem is > > not the same. > > I think (and would like to know, too) using a digital output makes no > difference on the software side. The only matter is to switch to the > right output. > > If you look at it, you're writing out bytes to the analog output. This > output is some form of D/A-converter for analog signals and nothing but > a driver for digital signals. > > So, if you use the right enconding for sending your sound data stream > (this may require some software) and switched the soundcard to the SPDIF > out then anything should work. > > HTH, > Marc > > > > _______________________________________________ > fpc-pascal maillist - fpc-pascal@lists.freepascal.org > http://lists.freepascal.org/mailman/listinfo/fpc-pascal > _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
