gzdoom-gles/libraries/zmusic/mididevices/music_opnmidi_mididevice.cpp

/*
** music_opnmidi_mididevice.cpp
** Provides access to libOPNMIDI as a generic MIDI 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.
**---------------------------------------------------------------------------
**
*/

// HEADER FILES ------------------------------------------------------------

#include "mididevice.h"
#include "opnmidi.h"

class OPNMIDIDevice : public SoftSynthMIDIDevice
{
	struct OPN2_MIDIPlayer *Renderer;
public:
	OPNMIDIDevice(const OpnConfig *config);
	~OPNMIDIDevice();
	
	
	int OpenRenderer();
	int GetDeviceType() const override { return MDEV_OPN; }
	
protected:
	void HandleEvent(int status, int parm1, int parm2);
	void HandleLongEvent(const uint8_t *data, int len);
	void ComputeOutput(float *buffer, int len);
	
private:
	int LoadCustomBank(const char *bankfile);
};


enum
{
	ME_NOTEOFF = 0x80,
	ME_NOTEON = 0x90,
	ME_KEYPRESSURE = 0xA0,
	ME_CONTROLCHANGE = 0xB0,
	ME_PROGRAM = 0xC0,
	ME_CHANNELPRESSURE = 0xD0,
	ME_PITCHWHEEL = 0xE0
};


//==========================================================================
//
// OPNMIDIDevice Constructor
//
//==========================================================================

OPNMIDIDevice::OPNMIDIDevice(const OpnConfig *config)
	:SoftSynthMIDIDevice(44100)
{
	Renderer = opn2_init(44100);	// todo: make it configurable
	if (Renderer != nullptr)
	{
		if (!LoadCustomBank(config->opn_custom_bank.c_str()))
		{
			if(config->default_bank.size() == 0)
			{
				opn2_close(Renderer);
				throw std::runtime_error("No OPN bank found");
			}
			opn2_openBankData(Renderer, config->default_bank.data(), (long)config->default_bank.size());
		}

		opn2_switchEmulator(Renderer, (int)config->opn_emulator_id);
		opn2_setRunAtPcmRate(Renderer, (int)config->opn_run_at_pcm_rate);
		opn2_setNumChips(Renderer, config->opn_chips_count);
		opn2_setSoftPanEnabled(Renderer, (int)config->opn_fullpan);
	}
	else
	{
		throw std::runtime_error("Unable to create OPN renderer.");
	}
}

//==========================================================================
//
// OPNMIDIDevice Destructor
//
//==========================================================================

OPNMIDIDevice::~OPNMIDIDevice()
{
	Close();
	if (Renderer != nullptr)
	{
		opn2_close(Renderer);
	}
}

//==========================================================================
//
// OPNMIDIDevice :: LoadCustomBank
//
// Loads a custom WOPN bank for libOPNMIDI. Returns 1 when bank has been
// loaded, otherwise, returns 0 when custom banks are disabled or failed
//
//==========================================================================


int OPNMIDIDevice::LoadCustomBank(const char *bankfile)
{
	if(!bankfile || !*bankfile)
		return 0;
	return (opn2_openBankFile(Renderer, bankfile) == 0);
}

//==========================================================================
//
// OPNMIDIDevice :: Open
//
// Returns 0 on success.
//
//==========================================================================

int OPNMIDIDevice::OpenRenderer()
{
	opn2_rt_resetState(Renderer);
	return 0;
}

//==========================================================================
//
// OPNMIDIDevice :: HandleEvent
//
//==========================================================================

void OPNMIDIDevice::HandleEvent(int status, int parm1, int parm2)
{
	int command = status & 0xF0;
	int chan	= status & 0x0F;

	switch (command)
	{
	case ME_NOTEON:
		opn2_rt_noteOn(Renderer, chan, parm1, parm2);
		break;

	case ME_NOTEOFF:
		opn2_rt_noteOff(Renderer, chan, parm1);
		break;

	case ME_KEYPRESSURE:
		opn2_rt_noteAfterTouch(Renderer, chan, parm1, parm2);
		break;

	case ME_CONTROLCHANGE:
		opn2_rt_controllerChange(Renderer, chan, parm1, parm2);
		break;

	case ME_PROGRAM:
		opn2_rt_patchChange(Renderer, chan, parm1);
		break;

	case ME_CHANNELPRESSURE:
		opn2_rt_channelAfterTouch(Renderer, chan, parm1);
		break;

	case ME_PITCHWHEEL:
		opn2_rt_pitchBendML(Renderer, chan, parm2, parm1);
		break;
	}
}

//==========================================================================
//
// OPNMIDIDevice :: HandleLongEvent
//
//==========================================================================

void OPNMIDIDevice::HandleLongEvent(const uint8_t *data, int len)
{
}

static const OPNMIDI_AudioFormat audio_output_format =
{
	OPNMIDI_SampleType_F32,
	sizeof(float),
	2 * sizeof(float)
};

//==========================================================================
//
// OPNMIDIDevice :: ComputeOutput
//
//==========================================================================

void OPNMIDIDevice::ComputeOutput(float *buffer, int len)
{
	OPN2_UInt8* left = reinterpret_cast<OPN2_UInt8*>(buffer);
	OPN2_UInt8* right = reinterpret_cast<OPN2_UInt8*>(buffer + 1);
	opn2_generateFormat(Renderer, len * 2, left, right, &audio_output_format);
}

//==========================================================================
//
//
//
//==========================================================================

MIDIDevice *CreateOPNMIDIDevice(const OpnConfig *config)
{
	return new OPNMIDIDevice(config);
}