bool WriteMidiFile(const MIDIMultiTrack &src, const char *file, bool use_running_status)
{
MIDIFileWriteStreamFileName out_stream( file );
if ( !out_stream.IsValid() )
return false;
MIDIFileWriteMultiTrack writer( &src, &out_stream );
// write midifile with or without running status usage
writer.UseRunningStatus( use_running_status );
int tracks_number = src.GetNumTracksWithEvents();
return writer.Write( tracks_number );
}
// delete all text events from multitrack object
bool DeleteAllTracksText( MIDIMultiTrack &tracks )
{
bool text_deleted = false;
int num_tracks = tracks.GetNumTracksWithEvents();
for ( int nt = 0; nt < num_tracks; ++nt )
{
MIDITrack &trk = *tracks.GetTrack( nt );
int num_events = trk.GetNumEvents();
for ( int ne = 0; ne < num_events; ++ne )
{
MIDITimedBigMessage *msg = trk.GetEvent( ne );
// convert any text midi event to NoOp event
if ( msg->IsTextEvent() )
{
trk.MakeEventNoOp( ne );
text_deleted = true;
}
}
}
return text_deleted;
}
int main ( int argc, char **argv )
{
int retcode = -1;
if ( argc <= 2 )
{
args_err();
return retcode;
}
const char *infile = argv[1];
const char *outfile = argv[2];
int mode = 0;
if ( argc > 3 )
mode = abs ( atol( argv[3] ) );
MIDIMultiTrack tracks, tracks2;
if ( !ReadMidiFile( infile, tracks ) )
{
cerr << "\nError reading file " << infile << endl;
return retcode;
}
if ( mode%2 == 1 ) // need to reduce outfile size
{
// delete all text events from all tracks
if ( DeleteAllTracksText( tracks ) )
{
cout << "\nAll midi text events deleted." << endl;
}
if ( tracks.GetNumTracksWithEvents() == 1 )
{
// remake multitrack object and optimize new tracks content:
// move all channal events to tracks 1-16, and all other types of events to track 0
// and reduce midifile size because of increase number of events with running status
tracks.AssignEventsToTracks( 0 );
cout << "\nAll midi channal events moved to tracks 1-16." << endl;
}
}
MIDIMultiTrack *outtracks = &tracks;
if ( mode >= 2 ) // need to delete start pause
{
CompressStartPause( tracks, tracks2 );
outtracks = &tracks2;
cout << "\nStart pause deleted (decreased)." << endl;
}
if ( WriteMidiFile( *outtracks, outfile) )
{
int num_tracks = outtracks->GetNumTracksWithEvents();
cout << "\nAll OK. Number of tracks with events " << num_tracks << endl;
retcode = 0;
}
else
{
cerr << "\nError writing file " << outfile << endl;
}
return retcode;
}