On 2010-11-27 10:35, Pedro Lopez-Cabanillas wrote:
On Saturday 27 November 2010, David Henningsson wrote:
Yesterday, I tried to chase down a bug I discovered - I rendered a song but
a few notes were slightly out of tune, but only when using floats, not when
using doubles!
[...]
I wonder what is causing the bug you described though. If we could
setup a reproducible file rendering case it would probably help track
down the problem.
The soundfont is the standard FluidR3_GM.sf2, the midi file is
http://www.mididatabase.com/20100702/pop/steviewonder/Dont_You_Worry_About_a_Thin.mid
, and the first offending notes are on channel 2, ~25 seconds into the
song. The notes are affected by pitch bend, this is probably related
somehow. That's how long I've come so far.
I couldn't reproduce the problem in any of my development machines. Using
floats or doubles it sounds pretty much alike.
But I've remembered another report about a similar problem, also related to
notes and pitch bend events:
http://lists.nongnu.org/archive/html/fluid-dev/2010-10/msg00101.html
http://sourceforge.net/apps/trac/fluidsynth/ticket/91
I couldn't reproduce a wrong behavior playing this song, either.
After long search, I finally found it! \o/
It's committed as http://sourceforge.net/apps/trac/fluidsynth/changeset/395/
Seems like we[1] used fluid_real_t to represent sample offsets at one
time, and then the sample offsets got rounded off, so that the loop went
slightly longer or shorter.
// David
[1] Looking at svn history, it was my fault originally.
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