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Summary
Submitted by algorithm on 22 November 2011
Just Dance 64
Demonstrates realtime loading and decompression of compressed audio data on stock hardware.
This is possible without breaking a sweat due to the predefined recompilation routines.
Instead of analysing a byte and extracting bits and performing decisions based on the content, the main core of the routine analyses the entire byte at once. (4 bytes of 8 bit sample data are compressed in a byte) and determines the course of action based on the 'Whole' value of the byte.
Main core of the decode routine only uses 1 raster line for 4 decompressed bytes! Due to this, it is no problem to load buffer data from disk as well as to combine other routines (the animation on the demo was just meant as a filler to show that the audio routine leaves plenty of processing time left for other actions)
There is over 2 minutes of audio packed to the disk.
The encoder on the PC side uses a variation of the ADPCM routine which results in higher quality audio.
Two optimum step sizes are chosen for each small chunk of the audio sample (instead of increasing/decreasing step value based on
previous prediction) |
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8.8/10 (21 votes) 