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Add SysEx retrieval to the MIDI file reader

This commit is contained in:
Randy Heit 2015-12-29 22:39:38 -06:00
parent 92e0bbeee9
commit 3ec6ad5018
2 changed files with 47 additions and 8 deletions
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2
src/sound/i_musicinterns.h
View File

@ -566,7 +566,7 @@ protected:
struct TrackInfo;
void ProcessInitialMetaEvents ();
DWORD *SendCommand (DWORD *event, TrackInfo *track, DWORD delay);
DWORD *SendCommand (DWORD *event, TrackInfo *track, DWORD delay, ptrdiff_t room, bool &sysex_noroom);
TrackInfo *FindNextDue ();
BYTE *MusHeader;

53
src/sound/music_smf_midiout.cpp
View File

@ -322,7 +322,12 @@ DWORD *MIDISong2::MakeEvents(DWORD *events, DWORD *max_event_p, DWORD max_time)
// Play all events for this tick.
do
{
DWORD *new_events = SendCommand(events, TrackDue, time);
bool sysex_noroom = false;
DWORD *new_events = SendCommand(events, TrackDue, time, max_event_p - events, sysex_noroom);
if (sysex_noroom)
{
return events;
}
TrackDue = FindNextDue();
if (new_events != events)
{
@ -366,12 +371,15 @@ void MIDISong2::AdvanceTracks(DWORD time)
//
//==========================================================================
DWORD *MIDISong2::SendCommand (DWORD *events, TrackInfo *track, DWORD delay)
DWORD *MIDISong2::SendCommand (DWORD *events, TrackInfo *track, DWORD delay, ptrdiff_t room, bool &sysex_noroom)
{
DWORD len;
BYTE event, data1 = 0, data2 = 0;
int i;
sysex_noroom = false;
size_t start_p = track->TrackP;
CHECK_FINISHED
event = track->TrackBegin[track->TrackP++];
CHECK_FINISHED
@ -588,13 +596,44 @@ DWORD *MIDISong2::SendCommand (DWORD *events, TrackInfo *track, DWORD delay)
}
else
{
// Skip SysEx events just because I don't want to bother with them.
// The old MIDI player ignored them too, so this won't break
// anything that played before.
// SysEx events could potentially not have enough room in the buffer...
if (event == MIDI_SYSEX || event == MIDI_SYSEXEND)
{
len = track->ReadVarLen ();
track->TrackP += len;
len = track->ReadVarLen();
if (len >= (MAX_EVENTS-1)*3*4)
{ // This message will never fit. Throw it away.
track->TrackP += len;
}
else if (len + 12 >= (size_t)room * 4)
{ // Not enough room left in this buffer. Backup and wait for the next one.
track->TrackP = start_p;
sysex_noroom = true;
return events;
}
else
{
events[0] = delay;
events[1] = 0;
BYTE *msg = (BYTE *)&events[3];
if (event == MIDI_SYSEX)
{ // Need to add the SysEx marker to the message.
events[2] = (MEVT_LONGMSG << 24) | (len + 1);
*msg++ = MIDI_SYSEX;
}
else
{
events[2] = (MEVT_LONGMSG << 24) | len;
}
memcpy(msg, &track->TrackBegin[track->TrackP], len);
msg += len;
// Must pad with 0
while ((size_t)msg & 3)
{
*msg++ = 0;
}
events = (DWORD *)msg;
track->TrackP += len;
}
}
else if (event == MIDI_META)
{