gzdoom-gles/src/sound/mididevices/music_opl_mididevice.cpp

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/*
** music_opl_mididevice.cpp
** Provides an emulated OPL implementation of a MIDI output device.
**
**---------------------------------------------------------------------------
** Copyright 2008 Randy Heit
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
** derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
**
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*/
// HEADER FILES ------------------------------------------------------------
#include "i_musicinterns.h"
#include "oplsynth/opl.h"
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// MACROS ------------------------------------------------------------------
// EXTERNAL FUNCTION PROTOTYPES --------------------------------------------
// PUBLIC FUNCTION PROTOTYPES ----------------------------------------------
// PRIVATE FUNCTION PROTOTYPES ---------------------------------------------
// EXTERNAL DATA DECLARATIONS ----------------------------------------------
// PRIVATE DATA DEFINITIONS ------------------------------------------------
// OPL implementation of a MIDI output device -------------------------------
class OPLMIDIDevice : public SoftSynthMIDIDevice, protected OPLmusicBlock
{
public:
OPLMIDIDevice(OPLMidiConfig *config);
int Open(MidiCallback, void *userdata);
void Close();
int GetTechnology() const;
FString GetStats();
protected:
void CalcTickRate();
int PlayTick();
void HandleEvent(int status, int parm1, int parm2);
void HandleLongEvent(const uint8_t *data, int len);
void ComputeOutput(float *buffer, int len);
bool ServiceStream(void *buff, int numbytes);
int GetDeviceType() const override { return MDEV_OPL; }
};
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// PUBLIC DATA DEFINITIONS -------------------------------------------------
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// CODE --------------------------------------------------------------------
//==========================================================================
//
// OPLMIDIDevice Contructor
//
//==========================================================================
OPLMIDIDevice::OPLMIDIDevice(OPLMidiConfig *config)
: SoftSynthMIDIDevice((int)OPL_SAMPLE_RATE), OPLmusicBlock(config->core, config->numchips)
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{
FullPan = config->fullpan;
memcpy(OPLinstruments, config->OPLinstruments, sizeof(OPLinstruments));
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}
//==========================================================================
//
// OPLMIDIDevice :: Open
//
// Returns 0 on success.
//
//==========================================================================
int OPLMIDIDevice::Open(MidiCallback callback, void *userdata)
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{
if (io == NULL || 0 == (NumChips = io->Init(currentCore, NumChips, FullPan, true)))
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{
return 1;
}
int ret = OpenStream(14, (FullPan || io->IsOPL3) ? 0 : SoundStream::Mono, callback, userdata);
if (ret == 0)
{
stopAllVoices();
resetAllControllers(100);
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}
return ret;
}
//==========================================================================
//
// OPLMIDIDevice :: Close
//
//==========================================================================
void OPLMIDIDevice::Close()
{
SoftSynthMIDIDevice::Close();
io->Reset();
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}
//==========================================================================
//
// OPLMIDIDevice :: GetTechnology
//
//==========================================================================
int OPLMIDIDevice::GetTechnology() const
{
return MIDIDEV_FMSYNTH;
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}
//==========================================================================
//
// OPLMIDIDevice :: CalcTickRate
//
// Tempo is the number of microseconds per quarter note.
// Division is the number of ticks per quarter note.
//
//==========================================================================
void OPLMIDIDevice::CalcTickRate()
{
SoftSynthMIDIDevice::CalcTickRate();
io->SetClockRate(OPLmusicBlock::SamplesPerTick = SoftSynthMIDIDevice::SamplesPerTick);
}
//==========================================================================
//
// OPLMIDIDevice :: PlayTick
//
// We derive from two base classes that both define PlayTick(), so we need
// to be unambiguous about which one to use.
//
//==========================================================================
int OPLMIDIDevice::PlayTick()
{
return SoftSynthMIDIDevice::PlayTick();
}
//==========================================================================
//
// OPLMIDIDevice :: HandleEvent
//
// Processes a normal MIDI event.
//
//==========================================================================
void OPLMIDIDevice::HandleEvent(int status, int parm1, int parm2)
{
int command = status & 0xF0;
int channel = status & 0x0F;
// Swap voices 9 and 15, because their roles are reversed
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// in MUS and MIDI formats.
if (channel == 9)
{
channel = 15;
}
else if (channel == 15)
{
channel = 9;
}
switch (command)
{
case MIDI_NOTEOFF:
playingcount--;
noteOff(channel, parm1);
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break;
case MIDI_NOTEON:
playingcount++;
noteOn(channel, parm1, parm2);
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break;
case MIDI_POLYPRESS:
//DEBUGOUT("Unhandled note aftertouch: Channel %d, note %d, value %d\n", channel, parm1, parm2);
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break;
case MIDI_CTRLCHANGE:
switch (parm1)
{
// some controllers here get passed on but are not handled by the player.
//case 0: changeBank(channel, parm2); break;
case 1: changeModulation(channel, parm2); break;
case 6: changeExtended(channel, ctrlDataEntryHi, parm2); break;
case 7: changeVolume(channel, parm2, false); break;
case 10: changePanning(channel, parm2); break;
case 11: changeVolume(channel, parm2, true); break;
case 38: changeExtended(channel, ctrlDataEntryLo, parm2); break;
case 64: changeSustain(channel, parm2); break;
//case 67: changeSoftPedal(channel, parm2); break;
//case 91: changeReverb(channel, parm2); break;
//case 93: changeChorus(channel, parm2); break;
case 98: changeExtended(channel, ctrlNRPNLo, parm2); break;
case 99: changeExtended(channel, ctrlNRPNHi, parm2); break;
case 100: changeExtended(channel, ctrlRPNLo, parm2); break;
case 101: changeExtended(channel, ctrlRPNHi, parm2); break;
case 120: allNotesOff(channel, parm2); break;
case 121: resetControllers(channel, 100); break;
case 123: notesOff(channel, parm2); break;
//case 126: changeMono(channel, parm2); break;
//case 127: changePoly(channel, parm2); break;
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default:
//DEBUGOUT("Unhandled controller: Channel %d, controller %d, value %d\n", channel, parm1, parm2);
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break;
}
break;
case MIDI_PRGMCHANGE:
programChange(channel, parm1);
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break;
case MIDI_CHANPRESS:
//DEBUGOUT("Unhandled channel aftertouch: Channel %d, value %d\n", channel, parm1, 0);
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break;
case MIDI_PITCHBEND:
changePitch(channel, parm1, parm2);
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break;
}
}
//==========================================================================
//
// OPLMIDIDevice :: HandleLongEvent
//
//==========================================================================
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void OPLMIDIDevice::HandleLongEvent(const uint8_t *data, int len)
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{
}
//==========================================================================
//
// OPLMIDIDevice :: ComputeOutput
//
// We override ServiceStream, so this function is never actually called.
//
//==========================================================================
void OPLMIDIDevice::ComputeOutput(float *buffer, int len)
{
}
//==========================================================================
//
// OPLMIDIDevice :: ServiceStream
//
//==========================================================================
bool OPLMIDIDevice::ServiceStream(void *buff, int numbytes)
{
return OPLmusicBlock::ServiceStream(buff, numbytes);
}
//==========================================================================
//
// OPLMIDIDevice :: GetStats
//
//==========================================================================
FString OPLMIDIDevice::GetStats()
{
FString out;
for (uint32_t i = 0; i < io->NumChannels; ++i)
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{
char star = '*';
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if (voices[i].index == ~0u)
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{
star = '/';
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}
else if (voices[i].sustained)
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{
star = '-';
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}
else if (voices[i].current_instr_voice == &voices[i].current_instr->voices[1])
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{
star = '\\';
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}
else
{
star = '+';
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}
out += star;
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}
return out;
}
MIDIDevice* CreateOplMIDIDevice(OPLMidiConfig* config)
{
return new OPLMIDIDevice(config);
}