Lowered FluidSynth's default gain, and added config file and command-line

options to specify it. FluidSynth's gain ranges from 0.0 through 10.0 and
is probably measured in decibel, but to keep things simple, ScummVM uses
settings from 0 through 1000 instead. (Though currently there's no guard
against invalid settings.)

This is a slightly revised version of the non-GUI part of patch #1336171.

svn-id: r20030

1 files changed, 7 insertions, 3 deletions

diff --git a/sound/softsynth/fluidsynth.cpp b/sound/softsynth/fluidsynth.cpp
index a3aaab3bcb..e0ded4596f 100644
--- a/sound/softsynth/fluidsynth.cpp
+++ b/sound/softsynth/fluidsynth.cpp
@@ -114,10 +114,14 @@ int MidiDriver_FluidSynth::open() {
 
 	_settings = new_fluid_settings();
 
-	// The default gain setting is ridiculously low, but we can't set it
-	// too high either or sound will be clipped. This may need tuning...
+	// The default gain setting is ridiculously low - at least for me. This
+	// cannot be fixed by ScummVM's volume settings because they can only
+	// soften the sound, not amplify it, so instead we add an option to
+	// adjust the gain of FluidSynth itself.
 
-	setNum("synth.gain", 2.1);
+	double gain = (double)ConfMan.getInt("midi_gain") / 100.0;
+
+	setNum("synth.gain", gain);
 	setNum("synth.sample-rate", _outputRate);
 
 	_synth = new_fluid_synth(_settings);