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Add a config option to specify the extra MIDI volume scaling

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The value specified is in decibels.
This commit is contained in:
Chris Robinson
2014-01-17 00:58:47 -08:00
parent 08ba5d9dba
commit 50c8d9181a
1 changed files with 17 additions and 3 deletions
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Alc/midi/fluidsynth.c
+17 -3
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@@ -462,6 +462,7 @@ typedef struct FSynth {
ALsizei NumFontIDs;
ALboolean ForceGM2BankSelect;
ALfloat GainScale;
} FSynth;
static void FSynth_Construct(FSynth *self, ALCdevice *device);
@@ -495,6 +496,7 @@ static void FSynth_Construct(FSynth *self, ALCdevice *device)
self->FontIDs = NULL;
self->NumFontIDs = 0;
self->ForceGM2BankSelect = AL_FALSE;
self->GainScale = 0.2f;
}
static void FSynth_Destruct(FSynth *self)
@@ -520,6 +522,18 @@ static void FSynth_Destruct(FSynth *self)
static ALboolean FSynth_init(FSynth *self, ALCdevice *device)
{
ALfloat vol;
if(ConfigValueFloat("midi", "volume", &vol))
{
if(!(vol <= 0.0f))
{
ERR("MIDI volume %f clamped to 0\n", vol);
vol = 0.0f;
}
self->GainScale = powf(10.0f, vol / 20.0f);
}
self->Settings = new_fluid_settings();
if(!self->Settings)
{
@@ -528,6 +542,7 @@ static ALboolean FSynth_init(FSynth *self, ALCdevice *device)
}
fluid_settings_setint(self->Settings, "synth.polyphony", 256);
fluid_settings_setnum(self->Settings, "synth.gain", self->GainScale);
fluid_settings_setnum(self->Settings, "synth.sample-rate", device->Frequency);
self->Synth = new_fluid_synth(self->Settings);
@@ -611,9 +626,8 @@ static ALenum FSynth_selectSoundfonts(FSynth *self, ALCcontext *context, ALsizei
static void FSynth_setGain(FSynth *self, ALfloat gain)
{
/* Scale gain by an additional 0.2 (-14dB), to help keep the mix from clipping. */
fluid_settings_setnum(self->Settings, "synth.gain", 0.2 * gain);
fluid_synth_set_gain(self->Synth, 0.2f * gain);
fluid_settings_setnum(self->Settings, "synth.gain", self->GainScale * gain);
fluid_synth_set_gain(self->Synth, self->GainScale * gain);
MidiSynth_setGain(STATIC_CAST(MidiSynth, self), gain);
}