throw new RuntimeException("you must install the GPL version" +
" of Xuggler (with IVideoResampler support) for " +
"this demo to work");
// Create a Xuggler container object
IContainer container = IContainer.make();
// Open up the container
if (container.open(filename, IContainer.Type.READ, null) < 0)
throw new IllegalArgumentException("could not open file: " + filename);
// query how many streams the call to open found
int numStreams = container.getNumStreams();
// and iterate through the streams to find the first video stream
int videoStreamId = -1;
IStreamCoder videoCoder = null;
for(int i = 0; i < numStreams; i++)
{
// Find the stream object
IStream stream = container.getStream(i);
// Get the pre-configured decoder that can decode this stream;
IStreamCoder coder = stream.getStreamCoder();
if (coder.getCodecType() == ICodec.Type.CODEC_TYPE_VIDEO)
{
videoStreamId = i;
videoCoder = coder;
break;
}
}
if (videoStreamId == -1)
throw new RuntimeException("could not find video stream in container: "
+filename);
/*
* Now we have found the video stream in this file. Let's open up our decoder so it can
* do work.
*/
if (videoCoder.open() < 0)
throw new RuntimeException("could not open video decoder for container: "
+filename);
IVideoResampler resampler = null;
if (videoCoder.getPixelType() != IPixelFormat.Type.BGR24)
{
// if this stream is not in BGR24, we're going to need to
// convert it. The VideoResampler does that for us.
resampler = IVideoResampler.make(videoCoder.getWidth(),
videoCoder.getHeight(), IPixelFormat.Type.BGR24,
videoCoder.getWidth(), videoCoder.getHeight(), videoCoder.getPixelType());
if (resampler == null)
throw new RuntimeException("could not create color space " +
"resampler for: " + filename);
}
/*
* And once we have that, we draw a window on screen
*/
openJavaWindow();
/*
* Now, we start walking through the container looking at each packet.
*/
IPacket packet = IPacket.make();
long firstTimestampInStream = Global.NO_PTS;
long systemClockStartTime = 0;
while(container.readNextPacket(packet) >= 0)
{
/*
* Now we have a packet, let's see if it belongs to our video stream
*/
if (packet.getStreamIndex() == videoStreamId)
{
/*
* We allocate a new picture to get the data out of Xuggler
*/
IVideoPicture picture = IVideoPicture.make(videoCoder.getPixelType(),
videoCoder.getWidth(), videoCoder.getHeight());
int offset = 0;
while(offset < packet.getSize())
{
/*
* Now, we decode the video, checking for any errors.
*
*/
int bytesDecoded = videoCoder.decodeVideo(picture, packet, offset);
if (bytesDecoded < 0)
throw new RuntimeException("got error decoding video in: "
+ filename);
offset += bytesDecoded;
/*
* Some decoders will consume data in a packet, but will not be able to construct
* a full video picture yet. Therefore you should always check if you
* got a complete picture from the decoder
*/
if (picture.isComplete())
{
IVideoPicture newPic = picture;
/*
* If the resampler is not null, that means we didn't get the
* video in BGR24 format and
* need to convert it into BGR24 format.
*/
if (resampler != null)
{
// we must resample
newPic = IVideoPicture.make(resampler.getOutputPixelFormat(),
picture.getWidth(), picture.getHeight());
if (resampler.resample(newPic, picture) < 0)
throw new RuntimeException("could not resample video from: "
+ filename);
}
if (newPic.getPixelType() != IPixelFormat.Type.BGR24)
throw new RuntimeException("could not decode video" +
" as BGR 24 bit data in: " + filename);
/**
* We could just display the images as quickly as we decode them,
* but it turns out we can decode a lot faster than you think.
*
* So instead, the following code does a poor-man's version of
* trying to match up the frame-rate requested for each
* IVideoPicture with the system clock time on your computer.
*
* Remember that all Xuggler IAudioSamples and IVideoPicture objects
* always give timestamps in Microseconds, relative to the first
* decoded item. If instead you used the packet timestamps, they can
* be in different units depending on your IContainer, and IStream
* and things can get hairy quickly.
*/
if (firstTimestampInStream == Global.NO_PTS)
{
// This is our first time through
firstTimestampInStream = picture.getTimeStamp();
// get the starting clock time so we can hold up frames
// until the right time.
systemClockStartTime = System.currentTimeMillis();
} else {
long systemClockCurrentTime = System.currentTimeMillis();
long millisecondsClockTimeSinceStartofVideo =
systemClockCurrentTime - systemClockStartTime;
// compute how long for this frame since the first frame in the
// stream.
// remember that IVideoPicture and IAudioSamples timestamps are
// always in MICROSECONDS,
// so we divide by 1000 to get milliseconds.
long millisecondsStreamTimeSinceStartOfVideo =
(picture.getTimeStamp() - firstTimestampInStream)/1000;
final long millisecondsTolerance = 50; // and we give ourselfs 50 ms of tolerance
final long millisecondsToSleep =
(millisecondsStreamTimeSinceStartOfVideo -
(millisecondsClockTimeSinceStartofVideo +
millisecondsTolerance));
if (millisecondsToSleep > 0)
{
try
{
Thread.sleep(millisecondsToSleep);
}
catch (InterruptedException e)
{
// we might get this when the user closes the dialog box, so
// just return from the method.
return;
}
}
}
// And finally, convert the BGR24 to an Java buffered image
BufferedImage javaImage = Utils.videoPictureToImage(newPic);
// and display it on the Java Swing window
updateJavaWindow(javaImage);
}
}
}
else
{
/*
* This packet isn't part of our video stream, so we just
* silently drop it.
*/
do {} while(false);
}
}
/*
* Technically since we're exiting anyway, these will be cleaned up by
* the garbage collector... but because we're nice people and want
* to be invited places for Christmas, we're going to show how to clean up.
*/
if (videoCoder != null)
{
videoCoder.close();
videoCoder = null;
}
if (container !=null)
{
container.close();
container = null;
}
closeJavaWindow();
}