6835393: MidiSystem fails to correctly read Sequence with SMPTE division

Reviewed-by: stayer

jdk/src/share/classes/com/sun/media/sound/StandardMidiFileReader.java

@@ -127,7 +127,7 @@ public class StandardMidiFileReader extends MidiFileReader {
                 resolution = timing;
             } else {
                 // SMPTE based timing.  first decipher the frame code.
-                int frameCode = (-1 * timing) >> 8;
+                int frameCode = -1 * (timing >> 8);
                 switch(frameCode) {
                 case 24:
                     divisionType = Sequence.SMPTE_24;

jdk/test/javax/sound/midi/File/SMPTESequence.java

@@ -0,0 +1,75 @@
+/**
+ * @test
+ * @bug 6835393
+ * @summary Tests that MidiFileReader correctly reads sequences with different division types
+ * @author Alex Menkov
+ */
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import javax.sound.midi.InvalidMidiDataException;
+import javax.sound.midi.MidiSystem;
+import javax.sound.midi.Sequence;
+
+public class SMPTESequence {
+
+    static int failed = 0;
+
+    public static void main(String[] args) {
+        test(Sequence.PPQ);
+        test(Sequence.SMPTE_24);
+        test(Sequence.SMPTE_25);
+        test(Sequence.SMPTE_30);
+        test(Sequence.SMPTE_30DROP);
+
+        if (failed > 0) {
+            throw new RuntimeException("" + failed + " tests failed");
+        }
+    }
+
+    static boolean test(float divisionType) {
+        boolean result = false;
+        try {
+            log("Testing divisionType == " + divisionType);
+            Sequence sequence = new Sequence(divisionType, 16, 1);
+            float div1 = sequence.getDivisionType();
+
+            ByteArrayOutputStream outStream = new ByteArrayOutputStream();
+            MidiSystem.write(sequence, 1, outStream);
+
+            InputStream inStream = new ByteArrayInputStream(outStream.toByteArray());
+
+            sequence = MidiSystem.getSequence(inStream);
+            float div2 = sequence.getDivisionType();
+
+            log("After write/read got divisionType == " + div2);
+            if (Math.abs(div2 - div1) < 0.001f) {
+                result = true;
+            }
+        } catch (InvalidMidiDataException ex) {
+            log(ex);
+        } catch (IOException ex) {
+            log(ex);
+        } catch (IllegalArgumentException ex) {
+            log(ex);
+        }
+        if (result) {
+            log("OK");
+        } else {
+            log("FAIL");
+            failed++;
+        }
+        return result;
+    }
+
+    static void log(String s) {
+        System.out.println(s);
+    }
+
+    static void log(Exception ex) {
+        log("got exception (" + ex.getClass().getSimpleName() + "): " + ex.getMessage());
+    }
+
+}