private static void writeFrame(OutputStream out, int b2, int b3, int b4) throws IOException {
        out.write(0xFF);
        out.write(b2);
        out.write(b3);
        out.write(b4);
    }
Writes a frame header in the given output stream.

@param out the output stream
@param b2  byte 2 of the header
@param b3  byte 3 of the header
@param b4  byte 4 of the header
@throws IOException if an error occurs
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-audiovideo-module/src/test/java/org/apache/tika/parser/mp3/MpegStreamTest.java