implemented Tempo Change event

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@2933 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/midi2/MidiLocalConsumer.cpp

@@ -243,7 +243,6 @@ void BMidiLocalConsumer::Data(
 					case B_CONTINUE:
 					case B_STOP:
 					case B_ACTIVE_SENSING:
-					case B_SYSTEM_RESET:
 					{
 						if (length == 1)
 						{
@@ -251,6 +250,22 @@ void BMidiLocalConsumer::Data(
 						}
 						break;
 					}
+
+					case B_SYSTEM_RESET:
+					{
+						if (length == 1)
+						{
+							SystemRealTime(data[0], time);
+						}
+						else if ((length == 6) && (data[1] == 0x51) 
+											   && (data[2] == 0x03))
+						{
+							int32 tempo = 
+								(data[3] << 16) | (data[4] << 8) | data[5];
+
+							TempoChange(60000000/tempo, time);
+						}
+					}
 				}
 				break;
 			}

src/kits/midi2/MidiLocalProducer.cpp

@@ -277,7 +277,17 @@ void BMidiLocalProducer::SpraySystemRealTime(
 void BMidiLocalProducer::SprayTempoChange(
 	int32 beatsPerMinute, bigtime_t time) const
 {
-	// This method does nothing, just like the BeOS R5 Midi Kit.
+	int32 tempo = 60000000 / beatsPerMinute;
+
+	uchar data[6];
+	data[0] = 0xFF;
+	data[1] = 0x51;
+	data[2] = 0x03;
+	data[3] = tempo >> 16;
+	data[4] = tempo >> 8;
+	data[5] = tempo;
+
+	SprayEvent(&data, 6, true, time);
 }
 
 //------------------------------------------------------------------------------