On Tue, Dec 13, 2005 at 02:18:49PM +0100, Tomasz Malesinski wrote: > I tried playing an Ogg Vorbis song using the original firmware in my > emulator. Some data appeared in a place that looked like an audio > output buffer, but when I tried to play them there was only noise. I > have not yet analysed the codec yet (it is the Tremor decoder, a > little old and/or modified version). There may be a bug in my emulator > which causes errors in decoding, but it is also possible that the main > CPU does not decode the data entirely, for example it is the EPIC core > that does DCT and the data that I intercepted was not fully > decoded.
It turned out that it was a bug in emulation of 64-bit multiply instructions. After I fixed it, the original firmware correctly decoded a piece of an Ogg Vorbis song, so decoding can be done entirely by the main CPU. -- Tomek Malesinski
