better tempo-handling and note-alignment

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@490 0778d3d1-df1d-0410-868b-ea421aaaa00d

ChangeLog

@@ -1,3 +1,11 @@
+2007-07-17	Tobias Doerffel	<tobydox/at/users/dot/sourceforge/dot/net>
+
+	* include/midi.h:
+	* plugins/midi_import/midi_import.h:
+	* plugins/midi_import/midi_import.cpp:
+	- initial incomplete handling for tempo-events
+	- properly aligned imported notes
+
 2007-07-16	Tobias Doerffel	<tobydox/at/users/dot/sourceforge/dot/net>
 
 	* src/core/mixer.cpp:

include/midi.h

@@ -58,7 +58,8 @@ enum midiEventTypes
 	MIDI_ACTIVE_SENSING = 0xFE,
 	MIDI_SYSTEM_RESET = 0xFF,
 	// meta event - for midi files only
-	MIDI_META_EVENT = 0xFF
+	MIDI_META_EVENT = 0xFF,
+	MIDI_TEMPO = 0xFF51
 } ;
 
 

plugins/midi_import/midi_import.cpp

@@ -72,7 +72,10 @@ plugin::descriptor midiimport_plugin_descriptor =
 
 
 midiImport::midiImport( const QString & _file ) :
-	importFilter( _file, &midiimport_plugin_descriptor )
+	importFilter( _file, &midiimport_plugin_descriptor ),
+	m_events(),
+	m_smpteTiming( FALSE ),
+	m_tempo( 120 )
 {
 }
 
@@ -270,8 +273,8 @@ invalid_format:
 						NOTES_PER_OCTAVE * OCTAVES &&
 							keys[ev.key()][0] >= 0 )
 					{
-			note n( midiTime( ( tick - keys[ev.key()][0] ) / 10 ),
-				midiTime( keys[ev.key()][0] / 10 ),
+			note n( midiTime( ( tick - keys[ev.key()][0] ) * 16 / m_tempo ),
+				midiTime( keys[ev.key()][0] * 16 / m_tempo ),
 				(tones)( ev.key() % NOTES_PER_OCTAVE ),
 				(octaves)( ev.key() / NOTES_PER_OCTAVE ),
 				keys[ev.key()][1] * 100 / 128 );
@@ -280,6 +283,10 @@ invalid_format:
 					}
 					break;
 
+				case MIDI_TEMPO:
+					
+					break;
+
 				default:
 /*					printf( "Unhandled event: %#x\n",
 								ev.m_type );*/
@@ -485,6 +492,15 @@ bool FASTCALL midiImport::readTrack( int _track_end )
 							}
 							else
 							{
+								int tempo = readByte() << 16;
+								tempo |= readByte() << 8;
+								tempo |= readByte();
+								tempo = ( 60*1000*1000 ) / tempo;
+				m_events.push_back( qMakePair( tick,
+					midiEvent( MIDI_TEMPO,
+							0,
+							tempo,
+							0 ) ) );
 /*			event = new_event(track, 0);
 			event->type = SND_SEQ_EVENT_TEMPO;
 			event->port = port;
@@ -493,7 +509,7 @@ bool FASTCALL midiImport::readTrack( int _track_end )
 			event->data.tempo |= read_byte() << 8;
 			event->data.tempo |= read_byte();
 			skip( len -3 );*/
-								skip( len );
+								skip( len-3 );
 							}
 							break;
 

plugins/midi_import/midi_import.h

@@ -134,6 +134,7 @@ private:
 	typedef vvector<QPair<int, midiEvent> > eventVector;
 	eventVector m_events;
 	bool m_smpteTiming;
+	int m_tempo;
 
 } ;