Using this thread I have figured out how to use getData(), but instead of getting anything with 0x51, I am getting random values such as [B@37d78d93, [B@29d74462 and [B@1c5ca652
Outputting the meta message itself also results in similar values such as javax.sound.midi.MetaMessage@364d4fca, javax.sound.midi.MetaMessage@5581f86d and javax.sound.midi.MetaMessage@3f011b2b
For example, using
System.out.print ("the meta message is " + mm + ", ");
System.out.print ("the type of meta message is " + mm.getType());
System.out.println(" and the data is " + mm.getData());
outputs
the meta message is javax.sound.midi.MetaMessage@3f011b2b, the type of meta message is 81 and the data is [B@1c5ca652
How can I use the value at the end of the outputted mm value or the values taken from mm.getData() to get the tempo of a MIDI file?
Once you get the tempo MetaMessage, you can use this code to get the tempo in beats per minute.
/**
* Get the tempo in BPM coded in a Tempo Midi message.
*
* @param mm Must be a tempo MetaMessage (type=81)
* @return
*/
static public int getTempoInBPM(MetaMessage mm)
{
byte[] data = mm.getData();
if (mm.getType() != 81 || data.length != 3)
{
throw new IllegalArgumentException("mm=" + mm);
}
int mspq = ((data[0] & 0xff) << 16) | ((data[1] & 0xff) << 8) | (data[2] & 0xff);
int tempo = Math.round(60000001f / mspq);
return tempo;
}