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Optimize synth code by pre-computing the volume scaling for each note.

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Scaling is now calculated once per MIDI event at the most, instead of
once per sample. Increase voice ramping speed, increase number of
active voices a little.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9870 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Stepan Moskovchenko 2006-05-03 19:32:22 +00:00
parent 7f1d214801
commit 28b5afd05a
4 changed files with 35 additions and 27 deletions
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2
apps/plugins/midiplay.c
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@ -22,7 +22,7 @@ PLUGIN_HEADER
#define FRACTSIZE 10
#define SAMPLE_RATE 22050 // 44100 22050 11025
#define MAX_VOICES 12 // Note: 24 midi channels is the minimum general midi
#define MAX_VOICES 13 // Note: 24 midi channels is the minimum general midi
// spec implementation
#define BUF_SIZE 512
#define NBUF 2