Examples of com.xuggle.xuggler.IRational

com.xuggle.xuggler.IRational
This class wraps represents a Rational number for the Xuggler.
Video formats often use rational numbers, and converting between them willy nilly can lead to rounding errors, and eventually, out of sync problems. Therefore we use IRational objects to pass around Rational Numbers and avoid conversion until the very last moment.
Note: There are some static convenience methods in this class that start with s*. They start with s (as opposed to overloading methods (e.g. sAdd(...) vs. add(...)).

        // get streams coder
        IStreamCoder coder = stream.getStreamCoder();
        // set codec for the stream
        coder.setCodec(videoFormat);
        // framerate
        IRational fps = IRational.make(framerate);
        // timebase = 1/fps
        coder.setTimeBase(IRational.make(fps.getDenominator(), fps
            .getNumerator()));
        coder.setPixelType(pixelformat);
        // set resolution
        coder.setHeight(height);
        coder.setWidth(width);

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         * 
         * But take my word that time stamps are tricky, and this only touches
         * the envelope. The good news is, it's easier in Xuggler than some
         * other systems.
         */
        IRational num = null;
        num = ic.getFrameRate();
        oc.setFrameRate(num);
        oc.setTimeBase(IRational.make(num.getDenominator(), num
                .getNumerator()));
        num = null;


        /**
         * And allocate buffers for us to store decoded and resample video

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      IStream stream = mIContainer.getStream(i);
      long tsOffset = 0;
      if (stream.getStartTime() != Global.NO_PTS && stream.getStartTime() > 0
          && stream.getTimeBase() != null)
      {
        IRational defTimeBase = IRational.make(1,
            (int) Global.DEFAULT_PTS_PER_SECOND);
        tsOffset = defTimeBase.rescale(stream.getStartTime(), stream
            .getTimeBase());
      }
      /**
       * And look up the appropriate objects that are working on that stream.
       */

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   * @param oPacket the packet about to be written.
   */
  private void delayForRealTime(IPacket oPacket)
  {
    // convert packet timestamp to microseconds
    final IRational timeBase = oPacket.getTimeBase();
    if (timeBase == null || timeBase.getNumerator() == 0 ||
        timeBase.getDenominator() == 0)
      return;
    long dts = oPacket.getDts();
    if (dts == Global.NO_PTS)
      return;
    
    final long currStreamTime = IRational.rescale(dts,
        1,
        1000000,
        timeBase.getNumerator(),
        timeBase.getDenominator(),
        IRational.Rounding.ROUND_NEAR_INF);
    if (mStartStreamTime == null)
      mStartStreamTime = currStreamTime;


    // convert now to microseconds

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  }
  
  @Test
  public void testVideoFrameRate()
  {
    IRational val=IRational.make(30, 1);
    ISimpleMediaFile obj = new SimpleMediaFile();
    assertNull(obj.getVideoFrameRate());
    obj.setVideoFrameRate(val);
    assertEquals("set method failed", val.getNumerator(), obj.getVideoFrameRate().getNumerator());
    assertEquals("set method failed", val.getDenominator(), obj.getVideoFrameRate().getDenominator());
  }

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  @Test
  public void testCompareTo()
  {
    int retval = -1;
    IRational otherRational = IRational.make(5);
    mRational = IRational.make(4);


    retval = mRational.compareTo(otherRational);
    assertTrue(retval <0);
    retval = otherRational.compareTo(mRational);
    assertTrue(retval >0);
    retval = mRational.compareTo(mRational);
    assertTrue(retval == 0);
    retval = IRational.sCompareTo(mRational, otherRational);
    assertTrue(retval < 0);

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  }
  
  @Test
  public void testMultiply()
  {
    IRational a = IRational.make(12);
    IRational b = IRational.make(3);
    
    mRational = IRational.sMultiply(a, b);
    assertTrue(mRational.getDouble() == 36);
  }

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  }


  @Test
  public void testAdd()
  {
    IRational a = IRational.make(12);
    IRational b = IRational.make(3);
    
    mRational = IRational.sAdd(a, b);
    assertTrue(mRational.getDouble() == 15);
  }

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  }  


  @Test
  public void testSubtract()
  {
    IRational a = IRational.make(12);
    IRational b = IRational.make(3);
    
    mRational = IRational.sSubtract(a, b);
    assertTrue(mRational.getDouble() == 9);
  }

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  }
  
  @Test
  public void testDivision()
  {
    IRational a = IRational.make(12);
    IRational b = IRational.make(3);
    
    mRational = IRational.sDivide(a, b);
    assertTrue(mRational.getDouble() == 4);
    
    mRational = IRational.sDivide(

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Related Classes of com.xuggle.xuggler.IRational

com.xuggle.mediatool.MediaWriter

com.xuggle.xuggler.Converter

com.xuggle.xuggler.RationalTest

com.xuggle.xuggler.SimpleMediaFile

com.xuggle.xuggler.SimpleMediaFileTest

com.xuggle.xuggler.StreamCoderTest

com.xuggle.xuggler.StreamTest

de.fu_berlin.inf.dpp.videosharing.encode.XugglerEncoder

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