why decoding ogg data is so heavy processing?

Started by bahe September 10, 2003 11:35 AM

2 comments, last by bahe 21 years, 3 months ago

Author

122

September 10, 2003 11:35 AM

I use ogglib to decode ogg music data and get the PCM data from it then fill a small buffer with the decoded data, the problem is that I need to continuosly decode ogg data while game is playing (I''m using another thread for decoding). this decoding process affects the game smoothness terribly. I tried using ''setthreadpriority'' with BELOW_NORMAL parameter and it is a little better with the problem of playing buffer portions which has not been ready to be played. what can I do?

joanusdmentia

1,060

September 11, 2003 07:00 AM

I don''t think it would much more CPU intensive to decode than MP3z are, so there shouldn''t really be a problem getting it working, I know that Unreal Tournament and Unreal 2 manage using ogg for music just fine. Is the file loaded into memory at load time rather than constantly fetching from disk? Are you building the lib yourself? If so check that optimizations are on. Apart from that all I can think of is try a different library. I haven''t used ogglib so I can''t comment on how efficient it is.

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bahe

Author

122

September 11, 2003 10:49 AM

the whole data is loade into memory, I''m using ogglib ... I may check fmod but I noticed that while playing ogg music in winamp it also affects my game performance, I''m worried if there is a trick to solve this?
note that in P4 2.4 it is ok but the problem is in PII 500

Andrew Russell

1,394

September 14, 2003 09:08 AM

The P2''s instruction set (especialy SIMD) is less than that of the P4 - therein could lie your problem. Do you get the same problem on a P3? on an AMD? How about with an MP3 in winamp.

Of course, it''s not a good idea to use MP3 for your final thing (licencing and quality issues).

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why decoding ogg data is so heavy processing?

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