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AUDIO: Add default for OPL channel volume

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This adds an option to the AdLib multisource driver to set the MIDI channel
volume that will be used to initialize to OPL 4x registers.
This commit is contained in:
Coen Rampen 2021-09-25 21:37:04 +02:00
parent 111b237e02
commit d8491ecea4
2 changed files with 14 additions and 2 deletions
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13
audio/adlib_ms.cpp
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@ -377,6 +377,7 @@ MidiDriver_ADLIB_Multisource::MidiDriver_ADLIB_Multisource(OPL::Config::OplType
_isOpen(false),
_accuracyMode(ACCURACY_MODE_SB16_WIN95),
_allocationMode(ALLOCATION_MODE_DYNAMIC),
_defaultChannelVolume(0),
_noteSelect(NOTE_SELECT_MODE_0),
_modulationDepth(MODULATION_DEPTH_HIGH),
_vibratoDepth(VIBRATO_DEPTH_HIGH),
@ -421,6 +422,13 @@ int MidiDriver_ADLIB_Multisource::open() {
if (!_opl->init())
return MERR_CANNOT_CONNECT;
// Set default MIDI channel volume on control data.
for (int i = 0; i < MAXIMUM_SOURCES; i++) {
for (int j = 0; j < MIDI_CHANNEL_COUNT; j++) {
_controlData[i][j].volume = _defaultChannelVolume;
}
}
// Set default OPL register values.
initOpl();
@ -987,8 +995,9 @@ void MidiDriver_ADLIB_Multisource::initOpl() {
break;
case 1:
baseReg = OPL_REGISTER_BASE_LEVEL;
// Set default volume to 3F (maximum attenuation).
value = OPL_LEVEL_DEFAULT;
// Set volume to the default MIDI channel volume.
// Convert from MIDI to OPL register value.
value = 0x3F - (_defaultChannelVolume >> 1);
break;
case 2:
baseReg = OPL_REGISTER_BASE_DECAY_ATTACK;

3
audio/adlib_ms.h
View File

@ -1006,6 +1006,9 @@ protected:
// Controls the OPL channel allocation behavior.
ChannelAllocationMode _allocationMode;
// The default MIDI channel volume (set when opening the driver).
uint8 _defaultChannelVolume;
// OPL global settings. Set these, then call oplInit or open to apply the
// new values.
NoteSelectMode _noteSelect;