Uses of Class
org.gstreamer.lowlevel.NativeValue

Packages that use NativeValue
org.gstreamer   
org.gstreamer.controller   
org.gstreamer.elements   
org.gstreamer.elements.good   
org.gstreamer.event   
org.gstreamer.glib   
org.gstreamer.interfaces   
org.gstreamer.io   
org.gstreamer.lowlevel   
org.gstreamer.message   
org.gstreamer.query   
 

Uses of NativeValue in org.gstreamer
 

Subclasses of NativeValue in org.gstreamer
 class Bin
          Base class and element that can contain other elements.
 class Buffer
          Data-passing buffer type, supporting sub-buffers.
 class Bus
          The Bus is an object responsible for delivering Messages in a first-in first-out way from the streaming threads to the application.
 class Caps
          Structure describing sets of media formats
 class Clock
          Abstract class for global clocks.
 class ClockID
          A datatype to hold the handle to an outstanding sync or async clock callback.
 class DateTime
           
 class Element
          Abstract base class for all pipeline elements.
 class ElementFactory
          ElementFactory is used to create instances of elements.
 class Event
          Base type of all events.
 class GhostPad
          Pseudo link pads.
 class GObject
          This is an abstract class providing some GObject-like facilities in a common base class.
 class GstObject
          Base class for the GStreamer object hierarchy GstObject provides a root for the object hierarchy tree filed in by the GStreamer library.
 class Message
          Lightweight objects to signal the occurrence of pipeline events.
 class MiniObject
          Lightweight base class for the GStreamer object hierarchy MiniObject is a baseclass like GObject, but has been stripped down of features to be fast and small.
 class Pad
          Object contained by elements that allows links to other elements.
 class PadTemplate
          Padtemplates describe the possible media types a Pad or an ElementFactory can handle.
 class Pipeline
          A Pipeline is a special Bin used as the toplevel container for the filter graph.
 class Plugin
          Container for features loaded from a shared object module
 class PluginFeature
          Base class for contents of a Plugin This is a base class for anything that can be added to a Plugin.
 class Query
          Base query type
 class Registry
          Abstract base class for management of Plugin objects.
 class StreamInfo
          Object containing specific meta information such as width/height/framerate of video streams or samplerate/number of channels of audio.
 class Structure
          Generic structure containing fields of names and values.
 class TagList
          List of tags and values used to describe media metadata.
 

Uses of NativeValue in org.gstreamer.controller
 

Subclasses of NativeValue in org.gstreamer.controller
 class Controller
          The controller subsystem offers a lightweight way to adjust gobject properties over stream-time.
 class ControlSource
          The ControlSource is a base class for control value sources that could be used by Controller to get timestamp-value pairs.
 class InterpolationControlSource
          The ControlSource is a base class for control value sources that could be used by Controller to get timestamp-value pairs.
 class LFOControlSource
          The ControlSource is a base class for control value sources that could be used by Controller to get timestamp-value pairs.
 

Uses of NativeValue in org.gstreamer.elements
 

Subclasses of NativeValue in org.gstreamer.elements
 class AppSink
          A sink Element that enables an application to pull data from a pipeline.
 class AppSrc
          Enables an application to feed buffers into a pipeline.
 class BaseSink
           
 class BaseSrc
           
 class BaseTransform
           
 class BufferDataAppSink
          Class that allows to pull out native buffers from the GStreamer pipeline into the application.
 class BufferDataSink
          Class that allows to pull out native buffers from the GStreamer pipeline into the application.
 class ByteDataAppSink
          Class that allows to pull out buffers from the GStreamer pipeline into the application, using an appsink.
 class ByteDataSink
          Class that allows to pull out buffers from the GStreamer pipeline into the application, using an appsink.
 class CustomSink
           
 class CustomSrc
           
 class DecodeBin
          Deprecated. This element is deprecated and no longer supported. You should use the uridecodebin or decodebin2 element instead (or, even better: playbin2).
 class DecodeBin2
          Utility Element to automatically identify media stream types and hook up elements.
 class FakeSink
           
 class FakeSrc
           
 class FileSink
          A gstreamer element that write to a file.
 class FileSrc
          A gstreamer element that reads from a file.
 class Identity
           
 class InputSelector
           
 class MultiQueue
          A gstreamer element for Multiple data queue.
 class PlayBin
          Deprecated. This element is deprecated and no longer supported. You should use the PlayBin2 element instead. Playbin provides a stand-alone everything-in-one abstraction for an audio and/or video player.

It can handle both audio and video files and features

  • automatic file type recognition and based on that automatic selection and usage of the right audio/video/subtitle demuxers/decoders
  • visualisations for audio files
  • subtitle support for video files
  • stream selection between different audio/subtitles streams
  • meta info (tag) extraction
  • easy access to the last video frame
  • buffering when playing streams over a network
  • volume control

Usage

A playbin element can be created just like any other element using ElementFactory.make(java.lang.String, java.lang.String), although to call PlayBin specific methods, it is best to create one via a PlayBin.PlayBin(String) or PlayBin.PlayBin(String, URI) constructor.

The file/URI to play should be set via PlayBin.setInputFile(java.io.File) or PlayBin.setURI(java.net.URI)

Playbin is a Pipeline. It will notify the application of everything that's happening (errors, end of stream, tags found, state changes, etc.) by posting messages on its Bus. The application needs to watch the bus.

Playback can be initiated by setting the PlayBin to PLAYING state using setState or play. Note that the state change will take place in the background in a separate thread, when the function returns playback is probably not happening yet and any errors might not have occured yet. Applications using playbin should ideally be written to deal with things completely asynchroneous.

When playback has finished (an EOS message has been received on the bus) or an error has occured (an ERROR message has been received on the bus) or the user wants to play a different track, playbin should be set back to READY or NULL state, then the input file/URI should be set to the new location and then playbin be set to PLAYING state again.

Seeking can be done using seek on the playbin element. Again, the seek will not be executed instantaneously, but will be done in a background thread. When the seek call returns the seek will most likely still be in process. An application may wait for the seek to finish (or fail) using Element.getState(long) with -1 as the timeout, but this will block the user interface and is not recommended at all.

Applications may query the current position and duration of the stream via Pipeline.queryPosition() and Pipeline.queryDuration() and setting the format passed to Format.TIME. If the query was successful, the duration or position will have been returned in units of nanoseconds.

Advanced Usage: specifying the audio and video sink

By default, if no audio sink or video sink has been specified via PlayBin.setAudioSink(org.gstreamer.Element) and PlayBin.setVideoSink(org.gstreamer.Element), playbin will use the autoaudiosink and autovideosink elements to find the first-best available output method. This should work in most cases, but is not always desirable. Often either the user or application might want to specify more explicitly what to use for audio and video output.

If the application wants more control over how audio or video should be output, it may create the audio/video sink elements itself (for example using ElementFactory.make(java.lang.String, java.lang.String)) and provide them to playbin using PlayBin.setAudioSink(org.gstreamer.Element) and PlayBin.setVideoSink(org.gstreamer.Element)

GNOME-based applications, for example, will usually want to create gconfaudiosink and gconfvideosink elements and make playbin use those, so that output happens to whatever the user has configured in the GNOME Multimedia System Selector confinguration dialog.

The sink elements do not necessarily need to be ready-made sinks. It is possible to create container elements that look like a sink to playbin, but in reality contain a number of custom elements linked together. This can be achieved by creating a Bin and putting elements in there and linking them, and then creating a sink GhostPad for the bin and pointing it to the sink pad of the first element within the bin. This can be used for a number of purposes, for example to force output to a particular format or to modify or observe the data before it is output.

It is also possible to 'suppress' audio and/or video output by using 'fakesink' elements (or capture it from there using the fakesink element's "handoff" signal, which, nota bene, is fired from the streaming thread!).

Retrieving Tags and Other Meta Data

Most of the common meta data (artist, title, etc.) can be retrieved by watching for TAG messages on the pipeline's bus (see above).

Other more specific meta information like width/height/framerate of video streams or samplerate/number of channels of audio streams can be obtained using the "stream-info" property, which will return a GList of stream info objects, one for each stream. These are opaque objects that can only be accessed via the standard GObject property interface, ie. g_object_get(). Each stream info object has the following properties:

  • "object" (GstObject) (the decoder source pad usually)
  • "type" (enum) (if this is an audio/video/subtitle stream)
  • "decoder" (string) (name of decoder used to decode this stream)
  • "mute" (boolean) (to mute or unmute this stream)
  • "caps" (GstCaps) (caps of the decoded stream)
  • "language-code" (string) (ISO-639 language code for this stream, mostly used for audio/subtitle streams)
  • "codec" (string) (format this stream was encoded in)

Stream information from the stream-info properties is best queried once playbin has changed into PAUSED or PLAYING state (which can be detected via a state-changed message on the bus where old_state=READY and new_state=PAUSED), since before that the list might not be complete yet or not contain all available information (like language-codes).

Buffering

Playbin handles buffering automatically for the most part, but applications need to handle parts of the buffering process as well. Whenever playbin is buffering, it will post BUFFERING messages on the bus with a percentage value that shows the progress of the buffering process. Applications need to set playbin to PLAYING or PAUSED state in response to these messages. They may also want to convey the buffering progress to the user in some way. Here is how to extract the percentage information from the message (requires GStreamer >= 0.10.11):

 PlayBin playbin = new PlayBin("player");
 playbin.getBus().connect(new Bus.BUFFERING() {
     public void bufferingMessage(GstObject element, int percent) {
         System.out.printf("Buffering (%u percent done)\n", percent);
     }
 }
 
Note that applications should keep/set the pipeline in the PAUSED state when a BUFFERING message is received with a buffer percent value < 100 and set the pipeline back to PLAYING state when a BUFFERING message with a value of 100 percent is received (if PLAYING is the desired state, that is).

Embedding the video window in your application

By default, playbin (or rather the video sinks used) will create their own window. Applications will usually want to force output to a window of their own, however. This can be done using the GstXOverlay interface, which most video sinks implement. See the documentation there for more details.

Specifying which CD/DVD device to use

The device to use for CDs/DVDs needs to be set on the source element playbin creates before it is opened. The only way to do this at the moment is to connect to playbin's "notify::source" signal, which will be emitted by playbin when it has created the source element for a particular URI. In the signal callback you can check if the source element has a "device" property and set it appropriately. In future ways might be added to specify the device as part of the URI, but at the time of writing this is not possible yet.

Examples

Here is a simple pipeline to play back a video or audio file:

gst-launch -v playbin uri=file:///path/to/somefile.avi

This will play back the given AVI video file, given that the video and audio decoders required to decode the content are installed. Since no special audio sink or video sink is supplied (not possible via gst-launch), playbin will try to find a suitable audio and video sink automatically using the autoaudiosink and autovideosink elements.

Here is a another pipeline to play track 4 of an audio CD:

gst-launch -v playbin uri=cdda://4

This will play back track 4 on an audio CD in your disc drive (assuming the drive is detected automatically by the plugin).

Here is a another pipeline to play title 1 of a DVD: gst-launch -v playbin uri=dvd://1 This will play back title 1 of a DVD in your disc drive (assuming the drive is detected automatically by the plugin).

 class PlayBin2
           
 class Queue
          A gstreamer element for data queue.
 class Queue2
          A gstreamer element for data queue.
 class RGBDataAppSink
          Class that allows to pull out buffers from the GStreamer pipeline into the application.
 class RGBDataFileSink
          This bin encapsulates a pipeline that allows to encode RGB buffers into a video file.
 class RGBDataSink
          Class that allows to pull out buffers from the GStreamer pipeline into the application.
 class Tee
          A gstreamer element for data queue.
 class TypeFind
          Utility Element to identify media types in the stream.
 

Uses of NativeValue in org.gstreamer.elements.good
 

Subclasses of NativeValue in org.gstreamer.elements.good
 class RTPBin
          Java representation of gstreamer gstrtpbin
 class RTSPSrc
          Java representation of gstreamer rtspsrc
 

Uses of NativeValue in org.gstreamer.event
 

Subclasses of NativeValue in org.gstreamer.event
 class BufferSizeEvent
          Notification of new latency adjustment.
 class EOSEvent
          End-Of-Stream.
 class FlushStartEvent
          Start a flush operation.
 class FlushStopEvent
          Stop a flush operation.
 class LatencyEvent
          Notification of new latency adjustment.
 class NavigationEvent
          Navigation events are usually used for communicating user requests, such as mouse or keyboard movements, to upstream elements.
 class NewSegmentEvent
          The newsegment event marks the range of buffers to be processed.
 class QOSEvent
          A quality message.
 class SeekEvent
          A request for a new playback position and rate.
 class StepEvent
          StepEvent.
 class TagEvent
          A new set of metadata tags has been found in the stream.
 

Uses of NativeValue in org.gstreamer.glib
 

Subclasses of NativeValue in org.gstreamer.glib
 class GDate
           
 

Uses of NativeValue in org.gstreamer.interfaces
 

Subclasses of NativeValue in org.gstreamer.interfaces
 class ColorBalance
           
 class ColorBalanceChannel
           
 class GstInterface
          Base type for all gstreamer interface proxies
 class Mixer
          Interface for elements that provide mixer operations
 class MixerTrack
           
 class Navigation
           
 class Property
           
 class PropertyProbe
          Interface for elements that provide mixer operations
 class Tuner
          Interface for elements providing tuner operations
 class TunerChannel
           
 class TunerNorm
           
 class VideoOrientation
           
 class XOverlay
          Interface for elements providing tuner operations
 

Uses of NativeValue in org.gstreamer.io
 

Subclasses of NativeValue in org.gstreamer.io
 class InputStreamSrc
           
 class OutputStreamSink
           
 class ReadableByteChannelSrc
           
 class WriteableByteChannelSink
           
 

Uses of NativeValue in org.gstreamer.lowlevel
 

Subclasses of NativeValue in org.gstreamer.lowlevel
 class GMainContext
           
 class GSource
           
 class Handle
           
 class MainLoop
          The GLib main loop.
 class NativeObject
           
 class RefCountedObject
          A NativeObject that has an associated reference count
 

Uses of NativeValue in org.gstreamer.message
 

Subclasses of NativeValue in org.gstreamer.message
 class BufferingMessage
          This message can be posted by an element that needs to buffer data before it can continue processing.
 class DurationMessage
          The duration of a pipeline has changed.
 class EOSMessage
          This message is generated and posted in the sink elements of a Bin.
 class ErrorMessage
          This message is posted by element when a fatal event occurs.
 class GErrorMessage
          Base class for ERROR, WARNING and INFO messages.
 class InfoMessage
          This message is posted by element to provide information to the application.
 class LatencyMessage
          Message posted by elements when their latency requirements have changed.
 class SegmentDoneMessage
          This message is posted by elements that finish playback of a segment as a result of a segment seek.
 class StateChangedMessage
          A state change message.
 class TagMessage
          This message is posted by elements that have discovered new tags.
 class WarningMessage
          This message is posted by element when a warning notice is required.
 

Uses of NativeValue in org.gstreamer.query
 

Subclasses of NativeValue in org.gstreamer.query
 class ApplicationQuery
          A Custom application query.
 class ConvertQuery
          Convert values between formats
 class DurationQuery
          Used to query the total duration of a stream.
 class FormatsQuery
          Used for querying formats of the stream.
 class LatencyQuery
           
 class PositionQuery
          Used to query an element for the current position in the stream.
 class SeekingQuery
          Used for querying the seeking properties of the stream.
 class SegmentQuery
          Used to discover information about the currently configured segment for playback.