[wdmaudiodev] AC3 over WaveCyclic
- From: Tomislav Harsnabovic <hars@xxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Tue, 22 Feb 2005 03:14:02 +0100
Hello all!
I am currently working on a driver for an ordinary PCI soundcard based on
the WaveCyclic port class, and I'm desperately trying to pass an AC3 stream
over S/PDIF. Unfortunately, my decoder doesn't make a sound. For testing
purposes, I utilize KsStudio and its 'Dolby Digital File Source' test
filter because PowerDVD/WinDVD aren't able to connect to the SPDIF
interface for some reason - they decode to PCM instead and pass the PCM
stream down to the driver, which works flawlessly like every other PCM stream.
The sound controller's registers and stuff are correctly set for an AC3
stream, so my first guess was that the AC3 frames were chopped by
WaveCyclic's stream copying mechanisms. Therefore I tried to force a
framing size of 0x600 bytes (size of an AC3 frame) and a DMA size which is
a multiple of 0x600 bytes. But that didn't help. And now I'm a bit lost
here because I ran out of good ideas.
I'd be grateful for some directions.
Cheers,
Tomislav
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