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259 lines
7.4 KiB
C
259 lines
7.4 KiB
C
//-------------------------------------------------------------------------
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/*
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Copyright (C) 2016 EDuke32 developers and contributors
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This file is part of EDuke32.
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EDuke32 is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License version 2
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as published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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//-------------------------------------------------------------------------
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#include "mpu401.h"
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#include "compat.h"
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#include "pragmas.h"
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include <mmsystem.h>
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static HMIDISTRM hmido = (HMIDISTRM)-1;
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static MIDIOUTCAPS midicaps;
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static DWORD mididevice = -1;
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#define PAD(x) ((((x)+3)&(~3)))
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#define BUFFERLEN (32*4*4)
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#define NUMBUFFERS 6
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static char eventbuf[NUMBUFFERS][BUFFERLEN];
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static int32_t eventcnt[NUMBUFFERS];
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static MIDIHDR bufferheaders[NUMBUFFERS];
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static int32_t _MPU_CurrentBuffer = 0;
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int32_t _MPU_BuffersWaiting = 0;
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extern uint32_t _MIDI_GlobalPositionInTicks;
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static uint32_t _MPU_LastEvent=0;
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#define MIDI_NOTE_OFF 0x80
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#define MIDI_NOTE_ON 0x90
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#define MIDI_POLY_AFTER_TCH 0xA0
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#define MIDI_CONTROL_CHANGE 0xB0
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#define MIDI_PROGRAM_CHANGE 0xC0
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#define MIDI_AFTER_TOUCH 0xD0
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#define MIDI_PITCH_BEND 0xE0
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#define MIDI_META_EVENT 0xFF
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#define MIDI_END_OF_TRACK 0x2F
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#define MIDI_TEMPO_CHANGE 0x51
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#define MIDI_MONO_MODE_ON 0x7E
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#define MIDI_ALL_NOTES_OFF 0x7B
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void MPU_FinishBuffer(int32_t buffer)
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{
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if (!eventcnt[buffer]) return;
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ZeroMemory(&bufferheaders[buffer], sizeof(MIDIHDR));
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bufferheaders[buffer].lpData = eventbuf[buffer];
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bufferheaders[buffer].dwBufferLength =
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bufferheaders[buffer].dwBytesRecorded = eventcnt[buffer];
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midiOutPrepareHeader((HMIDIOUT)hmido, &bufferheaders[buffer], sizeof(MIDIHDR));
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midiStreamOut(hmido, &bufferheaders[buffer], sizeof(MIDIHDR));
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// printf("Sending %d bytes (buffer %d)\n",eventcnt[buffer],buffer);
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_MPU_BuffersWaiting++;
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}
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void MPU_BeginPlayback(void)
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{
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_MPU_LastEvent = _MIDI_GlobalPositionInTicks;
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if (hmido != (HMIDISTRM)-1) midiStreamRestart(hmido);
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}
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void MPU_Pause(void)
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{
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if (hmido != (HMIDISTRM)-1) midiStreamPause(hmido);
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}
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void MPU_Unpause(void)
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{
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if (hmido != (HMIDISTRM)-1) midiStreamRestart(hmido);
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}
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void CALLBACK MPU_MIDICallback(HMIDIOUT handle, UINT uMsg, DWORD_PTR dwInstance, DWORD_PTR dwParam1, DWORD_PTR dwParam2)
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{
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UNREFERENCED_PARAMETER(dwInstance);
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UNREFERENCED_PARAMETER(dwParam2);
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switch (uMsg)
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{
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case MOM_DONE:
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midiOutUnprepareHeader((HMIDIOUT)handle, (MIDIHDR *)dwParam1, sizeof(MIDIHDR));
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for (int i=0; i<NUMBUFFERS; i++)
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{
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if ((MIDIHDR *)dwParam1 == &bufferheaders[i])
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{
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eventcnt[i] = 0; // marks the buffer as free
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// printf("Finished buffer %d\n",i);
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_MPU_BuffersWaiting--;
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break;
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}
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}
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return;
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default: return;
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}
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}
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int32_t MPU_GetNextBuffer(void)
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{
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for (int i = 0; i < NUMBUFFERS; i++)
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if (eventcnt[i] == 0)
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return i;
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return -1;
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}
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static int32_t const masks[3] ={ 0x00ffffffl, 0x0000ffffl, 0x000000ffl };
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void MPU_SendMidi(char *data, int32_t count)
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{
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if (count <= 0) return;
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if (count <= 3)
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{
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if (eventcnt[_MPU_CurrentBuffer] + 12 > BUFFERLEN)
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{
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// buffer over-full
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int32_t nextbuffer = MPU_GetNextBuffer();
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if (nextbuffer < 0)
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{
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// printf("All buffers full!\n");
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return;
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}
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MPU_FinishBuffer(_MPU_CurrentBuffer);
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_MPU_CurrentBuffer = nextbuffer;
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}
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char *p = eventbuf[_MPU_CurrentBuffer] + eventcnt[_MPU_CurrentBuffer];
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((int32_t *)p)[0] = _MIDI_GlobalPositionInTicks - _MPU_LastEvent;
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((int32_t *)p)[1] = 0;
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((int32_t *)p)[2] = (MEVT_SHORTMSG << 24) | ((*((int32_t *)data)) & masks[count-1]);
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eventcnt[_MPU_CurrentBuffer] += 12;
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}
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else
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{
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int32_t padded = PAD(count);
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if (eventcnt[_MPU_CurrentBuffer] + 12 + padded > BUFFERLEN)
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{
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// buffer over-full
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int32_t nextbuffer = MPU_GetNextBuffer();
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if (nextbuffer < 0)
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{
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// printf("All buffers full!\n");
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return;
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}
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MPU_FinishBuffer(_MPU_CurrentBuffer);
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_MPU_CurrentBuffer = nextbuffer;
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}
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char *p = eventbuf[_MPU_CurrentBuffer] + eventcnt[_MPU_CurrentBuffer];
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((int32_t *)p)[0] = _MIDI_GlobalPositionInTicks - _MPU_LastEvent;
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((int32_t *)p)[1] = 0;
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((int32_t *)p)[2] = (MEVT_LONGMSG<<24) | (count & 0xffffffl);
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p+=12; eventcnt[_MPU_CurrentBuffer] += 12;
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for (; count>0; count--, padded--, eventcnt[_MPU_CurrentBuffer]++)
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*(p++) = *(data++);
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for (; padded>0; padded--, eventcnt[_MPU_CurrentBuffer]++)
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*(p++) = 0;
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}
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_MPU_LastEvent = _MIDI_GlobalPositionInTicks;
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}
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int32_t MPU_Reset(void)
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{
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midiStreamStop(hmido);
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midiStreamClose(hmido);
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return MPU_Ok;
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}
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int32_t MPU_Init(int32_t addr)
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{
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for (int i=0; i<NUMBUFFERS; i++) eventcnt[i]=0;
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mididevice = addr;
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if (midiOutGetDevCaps(mididevice, &midicaps, sizeof(MIDIOUTCAPS)) != MMSYSERR_NOERROR) return MPU_Error;
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if (midiStreamOpen(&hmido,(LPUINT)&mididevice,1,(DWORD_PTR)MPU_MIDICallback,0L,CALLBACK_FUNCTION) != MMSYSERR_NOERROR) return MPU_Error;
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return MPU_Ok;
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}
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void MPU_NoteOff(char channel, char key, char velocity)
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{
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char msg[] = { (char)(MIDI_NOTE_OFF | channel), key, velocity };
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MPU_SendMidi(msg, sizeof(msg));
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}
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void MPU_NoteOn(char channel, char key, char velocity)
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{
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char msg[] = { (char)(MIDI_NOTE_ON | channel), key, velocity };
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MPU_SendMidi(msg, sizeof(msg));
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}
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void MPU_PolyAftertouch(char channel, char key, char pressure)
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{
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char msg[] = { (char) (MIDI_POLY_AFTER_TCH | channel), key, pressure };
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MPU_SendMidi(msg, sizeof(msg));
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}
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void MPU_ControlChange(char channel, char number, char value)
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{
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char msg[] = { (char) (MIDI_CONTROL_CHANGE | channel), number, value };
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MPU_SendMidi(msg, sizeof(msg));
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}
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void MPU_ProgramChange(char channel, char program)
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{
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char msg[] = { (char)(MIDI_PROGRAM_CHANGE | channel), program };
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MPU_SendMidi(msg, sizeof(msg));
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}
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void MPU_ChannelAftertouch(char channel, char pressure)
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{
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char msg[] = { (char)(MIDI_AFTER_TOUCH | channel), pressure };
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MPU_SendMidi(msg, sizeof(msg));
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}
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void MPU_PitchBend(char channel, char lsb, char msb)
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{
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char msg[] = { (char)(MIDI_PITCH_BEND | channel), lsb, msb };
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MPU_SendMidi(msg, sizeof(msg));
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}
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void MPU_SetTempo(int32_t tempo)
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{
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MIDIPROPTEMPO prop;
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prop.cbStruct = sizeof(MIDIPROPTEMPO);
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prop.dwTempo = tabledivide32_noinline(60000000l, tempo);
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midiStreamProperty(hmido, (LPBYTE)&prop, MIDIPROP_SET|MIDIPROP_TEMPO);
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}
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void MPU_SetDivision(int32_t division)
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{
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MIDIPROPTIMEDIV prop;
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prop.cbStruct = sizeof(MIDIPROPTIMEDIV);
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prop.dwTimeDiv = division;
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midiStreamProperty(hmido, (LPBYTE)&prop, MIDIPROP_SET|MIDIPROP_TIMEDIV);
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}
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