5 Sep
2003
5 Sep
'03
2:09 p.m.
On Fri, 5 Sep 2003, Julien Claassen wrote:
First of all: Thank you for giving me a pointer into the fluidsynth program.
I just looked it up again. You go into your
directory src, then you edit the
file: fluid_voice.c.
There you go to line 1372 (for version 1.0.3) and there you'll find:
count = calculate_hold_decay_buffers(voice, GEN_VOLENVDECAY,
GEN_KEYTOVOLENVDECAY, 1); /* 1 for decay */
After this line you can directly insert something like:
if (count <98) count = 98;
This didn't help but I changend in line 1362 after:
case GEN_VOLENVHOLD: /* SF2.01 section 8.1.3 # 35 */
case GEN_KEYTOVOLENVHOLD: /* SF2.01 section 8.1.3 # 39 */
count = calculate_hold_decay_buffers(voice, GEN_VOLENVHOLD, GEN_KEYTOVOLENVHOLD, 0);
/* 0 means: hold */
if (count < 98) count = 1771;
^^^^^
Now the strings hold the tone but there is a small problem in release.
I assume I could fix this similary. But more interesting is: I printed out the
"count" values at
GEN_VOLENVHOLD
GEN_VOLENVDECAY (GEN_VOLENVSUSTAIN, GEN_KEYTOVOLENVDECAY)
GEN_MODENVRELEASE
If I play the strings (program number 48 in GM scale) the values are:
GEN_MODENVRELEASE: 1191
GEN_VOLENVHOLD: 1771
GEN_VOLENVDECAY: 1771
If I do the same wit choir A (program number 52 in GM scale) the values are:
GEN_MODENVRELEASE: 728
GEN_VOLENVHOLD: 792
GEN_VOLENVDECAY: 19464
The difference is surprising because the strings and the choirA have certainly a
similar envelope.
Therefore I changed again at:
case GEN_VOLENVHOLD: /* SF2.01 section 8.1.3 # 35 */
case GEN_KEYTOVOLENVHOLD:
count = calculate_hold_decay_buffers(voice, GEN_VOLENVHOLD, GEN_KEYTOVOLENVHOLD, 0); /*
0 means: hold */
if (count < 98) count = 19464;
^^^^^
and at:
case GEN_VOLENVDECAY: /* SF2.01 section 8.1.3 # 36 */
case GEN_VOLENVSUSTAIN: /* SF2.01 section 8.1.3 # 37 */
case GEN_KEYTOVOLENVDECAY: /* SF2.01 section 8.1.3 # 40 */
count = calculate_hold_decay_buffers(voice, GEN_VOLENVDECAY, GEN_KEYTOVOLENVDECAY, 1);
/* 1 for decay */
if (count < 2000) count = 19464;
^^^^ ^^^^^
... and the strings are still too quietly but if I increase the volume of the single
NOTE_ON commands the strings
sound (almost) like on hardware wavetable synthesizer (with small distortions).
Because of the great differences (1771 << 19464) I assume still a SF2
interpretation error.
Feel free to give me instructions about what else shall I test.
--
J.Anders, Chemnitz, GERMANY (ja(a)informatik.tu-chemnitz.de)