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javaandroidmp4parser

Mp4parser: how to get matrix values for further use?

I want to get the double values out of the mp4parser Matrix, for use in some formulas. Is there any method/utility for this? I am using the last version for gradle, i.e. 1.1.9.

Solution

  • I found a solution. If there's a simpler one, please post it. If a is a mp4parser Matrix, then here is how to get in m the double values:

    ByteBuffer bb = ByteBuffer.allocate(36);
a.getContent(bb);
bb.position(0);
double [] m = {
    IsoTypeReader.readFixedPoint1616(bb),
    IsoTypeReader.readFixedPoint1616(bb),
    IsoTypeReader.readFixedPoint0230(bb),
    IsoTypeReader.readFixedPoint1616(bb),
    IsoTypeReader.readFixedPoint1616(bb),
    IsoTypeReader.readFixedPoint0230(bb),
    IsoTypeReader.readFixedPoint1616(bb),
    IsoTypeReader.readFixedPoint1616(bb),
    IsoTypeReader.readFixedPoint0230(bb)};