Example #1
0
        /** Creates new Staff from the parentInput's input stream.
         * The next object in the input stream must be of this type.
         * This also reads all the enclosed MeasureStartTimeSlice objects
         * which themselves contain the event TimeSlice and MusicSymbol objects.
         *
         * @param parentInput    the parent RIFF object being used to read the input stream
         */
        public static Staff newInstance(Riff parentInput)
        {
            Riff riffInput = new Riff(parentInput, "LIST");
              riffInput.requireFOURCC(RIFF_ID);

              Staff staff = new Staff(RiffStaffHeader.newInstance(riffInput));

              if (riffInput.getBytesRemaining() <= 0)
            // the staff is empty
            return staff;

              MeasureStartTimeSlice measureStart =
             RiffMeasureStartTimeSlice.maybeNew(riffInput);
              if (measureStart == null) {
            // For some reason, the first chunk in this staff is not a
            //   measure start time slice.  Create a fake one based
            //   on the previous staff system's end time
            // DEBUG: must implement this!  For now use start time of 0/1
            measureStart = new MeasureStartTimeSlice(new Rational(0, 1), null);
              }

              while (true) {
            if (staff.getMeasureStartCount() > 0 &&
            staff.getMeasureStart
              (staff.getMeasureStartCount() - 1).getStartTime().Equals
            (measureStart.getStartTime()))
              // This new measure start time is the same as the last one,
              // so just continue using the last one.
              // DEBUG: this still doesn't ensure increasing order
              // DEBUG: This discards the tags in the newly read measure start
              measureStart =
            staff.getMeasureStart(staff.getMeasureStartCount() - 1);
            else
              staff.addMeasureStart(measureStart);

            // Read event time slices until the next measure start time slice or
            //    end of the staff
            RiffMeasureStartTimeSlice.addTimeSlices(riffInput, measureStart);
            if (riffInput.getBytesRemaining() <= 0)
              // reached the end of the staff
              break;

            // The previous call to readTimeSlices has already
            //   ensured that the next chunk is a measure start time slice.
            measureStart = RiffMeasureStartTimeSlice.newInstance(riffInput);
              }

              return staff;
        }
        /** This reads event TimeSlice chunks from parentInput's input stream until the next
         * measure start time slice or no more bytesRemaining in the parentInput,
         * adding the TimeSlice objects to the measureStart's time slice list.
         * When this reads the TimeSlice, it also adds the subsequent music
         * symbols to it.
         *
         * @param parentInput    the parent RIFF object being used to read the input stream
         * @param measureStart  the MeasureStartTimeSlice to which TimeSlice
         *      objects are added.
         * @see TimeSlice
         */
        public static void addTimeSlices(Riff parentInput, MeasureStartTimeSlice measureStart)
        {
            if (parentInput.getBytesRemaining() <= 0)
            // This is a measure start time slice with nothing after it in the staff
            return;

              if (parentInput.peekFOURCC().Equals(RIFF_ID) &&
              parentInput.peekFirstChunkBYTE() == MEASURE_START)
            // The next chunk is already the start of a new measure
            return;

              TimeSlice timeSlice = RiffTimeSlice.maybeNew(parentInput);
              if (timeSlice == null)
            // For some reason, the first chunk after the measure start
            //   time slice is not an event time slice.  Create a fake one with
            //   start time of 0/1.
            // DEBUG: should mock up an input file and test this.
            timeSlice = new TimeSlice(new Rational(0, 1), null);

              while (true) {
            if (measureStart.getTimeSliceCount() > 0 &&
            measureStart.getTimeSlice
              (measureStart.getTimeSliceCount() - 1).getStartTime().Equals
            (timeSlice.getStartTime()))
              // This new time slice start time is the same as the last one,
              // so just continue using the last one.
              // DEBUG: this still doesn't ensure increasing order
              // DEBUG: This discards the tags in the newly read time slice
              timeSlice =
            measureStart.getTimeSlice(measureStart.getTimeSliceCount() - 1);
            else
              measureStart.addTimeSlice(timeSlice);

            // Read music symbols until the next time slice or
            //    end of the staff.
            RiffTimeSlice.addMusicSymbols(parentInput, timeSlice);
            if (parentInput.getBytesRemaining() <= 0)
              // reached the end of the staff
              break;
            // We know the next chunk is a time slice.  Check whether it is
            //    a measure start.
            if (parentInput.peekFirstChunkBYTE() == MEASURE_START)
              // The next chunk is the start of a new measure
              break;

            // We have now ensured that the next chunk is an event time slice.
            timeSlice = RiffTimeSlice.newInstance(parentInput);
              }
        }
Example #3
0
 /** Add the given measure start timeslice to the MeasureStartTimeSlice list.
  * This does not call invalidate(), but you may need to before displaying.
  *
  * @param measureStart  the MeasureStartTimeSlice to add.  It is an error if
  *        this is already the child of an object.
  * @throws HeirarchyException if the measureStart has already
  *      been added as a child to another object.
  * @see #invalidate
  */
 public void addMeasureStart(MeasureStartTimeSlice measureStart)
 {
     addChild(measureStart);
 }