OrdinaryMagician/vkdoom_m
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Fix Timidity's DLS instrument loading:

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- Envelope data needed to be converted to SF2 values.
- Fine tuning was ignored which made pretty much every instrument off tune.
- Despite this, it still sounds like shit compared to FMOD or Microsoft's
  wavetable synth. There are lots of missing notes and some instruments
  are still off tune. I'm not sure it's worth trying to salvage it. It'd
  probably be better to scrap it, since Timidity is very much oriented
  toward GF1 patches, which it handles perfectly fine.
This commit is contained in:
Randy Heit 2016-01-13 17:25:24 -06:00
commit f9574a98fd
4 changed files with 52 additions and 27 deletions
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29
src/timidity/mix.cpp
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@ -231,6 +231,10 @@ bool SF2Envelope::Update(Voice *v)
double sec;
double newvolume = 0;
// NOTE! The volume scale is different for different stages of the
// envelope generator:
// Attack stage goes from 0.0 -> 1.0, multiplied directly to the output.
// The following stages go from 0 -> -1000 cB (but recorded positively)
switch (stage)
{
case SF2_DELAY:
@ -333,6 +337,11 @@ bool SF2Envelope::Update(Voice *v)
#define FLUID_ATTEN_POWER_FACTOR (-531.509)
#define atten2amp(x) pow(10.0, (x) / FLUID_ATTEN_POWER_FACTOR)
static double cb_to_amp(double x) // centibels to amp
{
return pow(10, x / -200.f);
}
void SF2Envelope::ApplyToAmp(Voice *v)
{
double amp;
@ -343,13 +352,21 @@ void SF2Envelope::ApplyToAmp(Voice *v)
v->right_mix = 0;
return;
}
else if (stage == SF2_ATTACK)
amp = v->sample->type == INST_SF2 ? atten2amp(v->attenuation) : cb_to_amp(v->attenuation);
switch (stage)
{
amp = atten2amp(v->attenuation) * volume;
}
else
{
amp = atten2amp(v->attenuation) * cb_to_amp(volume);
case SF2_ATTACK:
amp *= volume;
break;
case SF2_HOLD:
break;
default:
amp *= cb_to_amp(volume);
break;
}
amp *= FINAL_MIX_SCALE * 0.5;
v->left_mix = float(amp * v->left_offset);