/*

native_midi: Hardware Midi support for the SDL_mixer library

Copyright (C) 2000,2001 Florian 'Proff' Schulze

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Library General Public

License as published by the Free Software Foundation; either

version 2 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

Library General Public License for more details.

You should have received a copy of the GNU Library General Public

License along with this library; if not, write to the Free

Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

Florian 'Proff' Schulze

florian.proff.schulze@gmx.net

*/

#include "SDL_config.h"

/* everything below is currently one very big bad hack ;) Proff */

#if __WIN32__

#define WIN32_LEAN_AND_MEAN

#include <windows.h>

#include <windowsx.h>

#include <mmsystem.h>

#include <stdio.h>

#include <stdlib.h>

#include <limits.h>

#include "native_midi.h"

#include "native_midi_common.h"

struct _NativeMidiSong {

};

static UINT MidiDevice=MIDI_MAPPER;

static HMIDISTRM hMidiStream;

static NativeMidiSong *currentsong;

static int BlockOut(NativeMidiSong *song)

{

MMRESULT err;

int BlockSize;

if ((song->MusicLoaded) && (song->NewEvents))

{

// proff 12/8/98: Added for savety

midiOutUnprepareHeader((HMIDIOUT)hMidiStream,&song->MidiStreamHdr,sizeof(MIDIHDR));

if (song->NewPos>=song->Size)

return 0;

BlockSize=(song->Size-song->NewPos);

if (BlockSize<=0)

return 0;

if (BlockSize>36000)

BlockSize=36000;

song->MidiStreamHdr.lpData=(void *)((unsigned char *)song->NewEvents+song->NewPos);

song->NewPos+=BlockSize;

song->MidiStreamHdr.dwBufferLength=BlockSize;

song->MidiStreamHdr.dwBytesRecorded=BlockSize;

song->MidiStreamHdr.dwFlags=0;

err=midiOutPrepareHeader((HMIDIOUT)hMidiStream,&song->MidiStreamHdr,sizeof(MIDIHDR));

if (err!=MMSYSERR_NOERROR)

return 0;

err=midiStreamOut(hMidiStream,&song->MidiStreamHdr,sizeof(MIDIHDR));

return 0;

}

return 1;

}

static void MIDItoStream(NativeMidiSong *song, MIDIEvent *evntlist)

{

int eventcount;

MIDIEvent *event;

MIDIEVENT *newevent;

eventcount=0;

event=evntlist;

while (event)

{

eventcount++;

event=event->next;

}

song->NewEvents=malloc(eventcount*3*sizeof(DWORD));

if (!song->NewEvents)

return;

memset(song->NewEvents,0,(eventcount*3*sizeof(DWORD)));

eventcount=0;

event=evntlist;

newevent=song->NewEvents;

while (event)

{

int status = (event->status&0xF0)>>4;

switch (status)

{

case MIDI_STATUS_NOTE_OFF:

case MIDI_STATUS_NOTE_ON:

case MIDI_STATUS_AFTERTOUCH:

case MIDI_STATUS_CONTROLLER:

case MIDI_STATUS_PROG_CHANGE:

case MIDI_STATUS_PRESSURE:

case MIDI_STATUS_PITCH_WHEEL:

newevent->dwDeltaTime=event->time;

newevent->dwEvent=(event->status|0x80)|(event->data[0]<<8)|(event->data[1]<<16)|(MEVT_SHORTMSG<<24);

newevent=(MIDIEVENT*)((char*)newevent+(3*sizeof(DWORD)));

eventcount++;

break;

case MIDI_STATUS_SYSEX:

if (event->status == 0xFF && event->data[0] == 0x51) /* Tempo change */

{

int tempo = (event->extraData[0] << 16) |

(event->extraData[1] << 8) |

event->extraData[2];

newevent->dwDeltaTime=event->time;

newevent->dwEvent=(MEVT_TEMPO<<24) | tempo;

newevent=(MIDIEVENT*)((char*)newevent+(3*sizeof(DWORD)));

eventcount++;

}

break;

}

event=event->next;

}

song->Size=eventcount*3*sizeof(DWORD);

{

int time;

int temptime;

song->NewPos=0;

time=0;

newevent=song->NewEvents;

while (song->NewPos<song->Size)

{

temptime=newevent->dwDeltaTime;

newevent->dwDeltaTime-=time;

time=temptime;

if ((song->NewPos+12)>=song->Size)

newevent->dwEvent |= MEVT_F_CALLBACK;

newevent=(MIDIEVENT*)((char*)newevent+(3*sizeof(DWORD)));

song->NewPos+=12;

}

}

song->NewPos=0;

song->MusicLoaded=1;

}

void CALLBACK MidiProc( HMIDIIN hMidi, UINT uMsg, DWORD_PTR dwInstance,

DWORD_PTR dwParam1, DWORD_PTR dwParam2 )

{

switch( uMsg )

{

case MOM_DONE:

if ((currentsong->MusicLoaded) && (dwParam1 == (DWORD_PTR)&currentsong->MidiStreamHdr))

BlockOut(currentsong);

break;

case MOM_POSITIONCB:

if ((currentsong->MusicLoaded) && (dwParam1 == (DWORD_PTR)&currentsong->MidiStreamHdr))

currentsong->MusicPlaying=0;

break;

default:

break;

}

}

int native_midi_detect()

{

MMRESULT merr;

HMIDISTRM MidiStream;

merr=midiStreamOpen(&MidiStream,&MidiDevice,(DWORD)1,(DWORD_PTR)MidiProc,(DWORD_PTR)0,CALLBACK_FUNCTION);

if (merr!=MMSYSERR_NOERROR)

return 0;

midiStreamClose(MidiStream);

return 1;

}

NativeMidiSong *native_midi_loadsong(char *midifile)

{

NativeMidiSong *newsong;

MIDIEvent *evntlist = NULL;

SDL_RWops *rw;

newsong=malloc(sizeof(NativeMidiSong));

if (!newsong)

return NULL;

memset(newsong,0,sizeof(NativeMidiSong));

/* Attempt to load the midi file */

rw = SDL_RWFromFile(midifile, "rb");

if (rw) {

evntlist = CreateMIDIEventList(rw, &newsong->ppqn);

SDL_RWclose(rw);

if (!evntlist)

{

free(newsong);

return NULL;

}

}

MIDItoStream(newsong, evntlist);

FreeMIDIEventList(evntlist);

return newsong;

}

NativeMidiSong *native_midi_loadsong_RW(SDL_RWops *rw)

{

NativeMidiSong *newsong;

MIDIEvent *evntlist = NULL;

newsong=malloc(sizeof(NativeMidiSong));

if (!newsong)

return NULL;

memset(newsong,0,sizeof(NativeMidiSong));

/* Attempt to load the midi file */

evntlist = CreateMIDIEventList(rw, &newsong->ppqn);

if (!evntlist)

{

free(newsong);

return NULL;

}

MIDItoStream(newsong, evntlist);

FreeMIDIEventList(evntlist);

return newsong;

}

void native_midi_freesong(NativeMidiSong *song)

{

if (hMidiStream)

{

midiStreamStop(hMidiStream);

midiStreamClose(hMidiStream);

}

if (song)

{

if (song->NewEvents)

free(song->NewEvents);

free(song);

}

}

void native_midi_start(NativeMidiSong *song)

{

MMRESULT merr;

MIDIPROPTIMEDIV mptd;

native_midi_stop();

if (!hMidiStream)

{

merr=midiStreamOpen(&hMidiStream,&MidiDevice,1,(DWORD)&MidiProc,0,CALLBACK_FUNCTION);

if (merr!=MMSYSERR_NOERROR)

{

hMidiStream=0;

return;

}

//midiStreamStop(hMidiStream);

currentsong=song;

currentsong->NewPos=0;

currentsong->MusicPlaying=1;

mptd.cbStruct=sizeof(MIDIPROPTIMEDIV);

mptd.dwTimeDiv=currentsong->ppqn;

merr=midiStreamProperty(hMidiStream,(LPBYTE)&mptd,MIDIPROP_SET | MIDIPROP_TIMEDIV);

BlockOut(song);

merr=midiStreamRestart(hMidiStream);

}

}

void native_midi_stop()

{

if (!hMidiStream)

return;

midiStreamStop(hMidiStream);

midiStreamClose(hMidiStream);

currentsong=NULL;

hMidiStream = 0;

}

int native_midi_active()

{

return currentsong->MusicPlaying;

}

void native_midi_setvolume(int volume)

{

int calcVolume;

if (volume > 128)

volume = 128;

if (volume < 0)

volume = 0;

calcVolume = (65535 * volume / 128);

midiOutSetVolume((HMIDIOUT)hMidiStream, MAKELONG(calcVolume , calcVolume));

}

char *native_midi_error()

{

return "";

}

#endif /* Windows native MIDI support */