Now for a real application - playing audio files.

Since putting together pipelines is tedious, boring and somewhat error-prone

for newcomers to gstreamer, there are already pre-fabricated Pipelines that

do it all for you, such as a PlayBin.

So, we will be lazy and use a PlayBin to build our AudioPlayer.

public class AudioPlayer {

public static void main(String[] args) {

args = Gst.init("AudioPlayer", args);

PlayBin playbin = new PlayBin("AudioPlayer");

playbin.setInputFile(new File(args[0]));

playbin.setVideoSink(ElementFactory.make("fakesink", "videosink"));

playbin.setState(State.PLAYING);

Gst.main();

playbin.setState(State.NULL);

}

}

You've already seen this line in the SimplePipelineTutorial:

args = Gst.init("AudioPlayer", args);

Next we created a PlayBin instead of a basic Pipeline:

PlayBin playbin = new PlayBin("AudioPlayer");

A PlayBin is just a special Pipeline, so all Pipeline methods work on it just

as they would on a normal Pipeline.

The PlayBin needs to know what file you want it to play, so tell it via:

playbin.setInputFile(new File(args[0]));

You can use playbin.setURI() instead when playing a file from a URL.

By default, if the PlayBin detects video in the file being played, it will open

a window to display the video - we don't want that, so we use our friend the

fakesink to turn off that ability by throwing away the video data.

playbin.setVideoSink(ElementFactory.make("fakesink", "videosink"));

After the PlayBin is set up, we set it playing, and cleanup after it finishes.

playbin.setState(State.PLAYING);

Gst.main();

playbin.setState(State.NULL);

You will recognise the above lines from the SimplePipelineTutorial.

Note: The AudioPlayer does not exit - we will address how to detect this in

another tutorial.