How read time coefficient from midi files?

[Andrzej Borucki]

        Sequence sequence = MidiSystem.getSequence(new File("d:\\res\\midi\\WildWaters.mid"));
	float ppq = sequence.PPQ;
	int resolution = sequence.getResolution();
	long tl = sequence.getTickLength();
	float divtime = sequence.getDivisionType();
	System.out.println("coeff = " + 79396.0/tl);

For file getTickLength() returns 58364 ticks, Midi Editor sat that file has 79396 ms. But sequence.PPQ is 0.0 and sequence.getDivisionType() is 0.0

( thread may be moved to Other JSE/JEE APIs )

[Rob Spoor]

sequence.PPQ is always 0.0, because it's a static final field. The division type also can't be used to determine the length; it's a type, and 0.0 means the type is Sequence.PPQ.

But what's wrong with sequence.getMicrosecondLength()? It's not in ms but a factor 1000 more precise.

[Andrzej Borucki]

Rob Spoor wrote:But what's wrong with sequence.getMicrosecondLength()? It's not in ms but a factor 1000 more precise.

I suggested that getMicrosecondLength() is always getTickLength() * 1000 ;-)
Thanks
(but if getResolution() == 384, it is not 120 beat per minute, is 115.2 - near value)

[Andrzej Borucki]

How to change content of file? IS example www.jsresources.org, but still problems?
What is velocity? beats per minute? why not 120 but 64? why ticks means not 1.3 millisecond interval but 0.5 second? How place shorter note?
How read instruments from file?
Sample code

        Synthesizer synthesizer;
        synthesizer = MidiSystem.getSynthesizer();
	synthesizer.open();
        MidiChannel chan = synthesizer.getChannels()[0];
        chan.programChange(1152, 14);

reads MidiChannel from system (global?) not from file.