Examples of org.gstreamer.Caps

org.gstreamer.Caps
Structure describing sets of media formats
Caps (capabilities) are lightweight objects describing media types. They are composed of an array of {@link Structure}.
Caps are exposed on {@link PadTemplate} to describe all possible types agiven pad can handle. They are also stored in the {@link Registry} along witha description of the {@link Element}.
Caps are exposed on the element pads using the {@link Pad#getCaps} method. This method describes the possible types that the pad can handle or produce at runtime.
Caps are also attached to buffers to describe the content of the data pointed to by the buffer with {@link Buffer#setCaps}. Caps attached to a {@link Buffer} allow for format negotiation upstream and downstream.
A Caps can be constructed with the following code fragment:
Caps caps = Caps.fromString("video/x-raw-rgb, bpp=32, depth=24, width=640, height=480");
A Caps is fixed when it has no properties with ranges or lists. Use {@link #isFixed} to test for fixed caps. Only fixed caps can beset on a {@link Pad} or {@link Buffer}.
Various methods exist to work with the media types such as subtracting or intersecting. @see Structure

        // JNA creates ByteBuffer using native byte order, set masks according to that.
        if (ByteOrder.nativeOrder() == ByteOrder.LITTLE_ENDIAN)
          caps.append("red_mask=(int)0xFF00, green_mask=(int)0xFF0000, blue_mask=(int)0xFF000000");
        else
          caps.append("red_mask=(int)0xFF0000, green_mask=(int)0xFF00, blue_mask=(int)0xFF");
        videofilter.setCaps(new Caps(caps.toString()));
        addMany(conv, videofilter, sink);
        Element.linkMany(conv, videofilter, sink);


        //
        // Link the ghost pads on the bin to the sink pad on the convertor

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    class AppSinkNewBufferListener implements AppSink.NEW_BUFFER {
        public void newBuffer(AppSink elem)
        {
            Buffer buffer = sink.pullBuffer();


            Caps caps = buffer.getCaps();
            Structure struct = caps.getStructure(0);


            int width = struct.getInteger("width");
            int height = struct.getInteger("height");
            if (width < 1 || height < 1) {
                return;

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        bufferDispatcher = new BufferDispatcher();
        executor = Gst.getScheduledExecutorService();


        Element formatConverter = ElementFactory.make("ffmpegcolorspace", "formatConverter");
        Element formatFilter = ElementFactory.make("capsfilter", "formatFilter");
        Caps capsFormat = Caps.fromString("video/x-raw-yuv,format=(fourcc)I420,width=" + width + ",height=" + height);
        formatFilter.setCaps(capsFormat);


        Element encoder = ElementFactory.make(encoderStr, "encoder");
        if (encoderPropertyNames != null && encoderPropertyData != null)
        {

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    class AppSinkNewBufferListener implements AppSink.NEW_BUFFER {
        public void newBuffer(AppSink elem)
        {
            Buffer buffer = sink.pullBuffer();


            Caps caps = buffer.getCaps();
            int n = buffer.getSize();
            
            if (n < 1) {
                return;
            }

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      //
      Element conv = ElementFactory.make("ffmpegcolorspace", "ColorConverter");
      Element videofilter = ElementFactory.make("capsfilter", "ColorFilter");
      StringBuilder caps = new StringBuilder("video/x-raw-rgb, bpp=32, depth=24, endianness=(int)4321, ");
      caps.append(mask);
      videofilter.setCaps(new Caps(caps.toString()));
      addMany(conv, videofilter, sink);
      Element.linkMany(conv, videofilter, sink);


      //
      // Link the ghost pads on the bin to the sink pad on the convertor

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        doHandoff(buffer, pad, true);
      }        
      
      private void doHandoff(Buffer buffer, Pad pad, boolean isPrerollFrame) {


            Caps caps = buffer.getCaps();
            Structure struct = caps.getStructure(0);


            int width = struct.getInteger("width");
            int height = struct.getInteger("height");
            if (width < 1 || height < 1) {
                return;

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        // JNA creates ByteBuffer using native byte order, set masks according to that.
        if (ByteOrder.nativeOrder() == ByteOrder.LITTLE_ENDIAN)
          caps.append("red_mask=(int)0xFF00, green_mask=(int)0xFF0000, blue_mask=(int)0xFF000000");
        else
          caps.append("red_mask=(int)0xFF0000, green_mask=(int)0xFF00, blue_mask=(int)0xFF");
        videofilter.setCaps(new Caps(caps.toString()));
        addMany(conv, videofilter, videosink);
        Element.linkMany(conv, videofilter, videosink);
        
        //
        // Link the ghost pads on the bin to the sink pad on the convertor

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          doHandoff(buffer, pad, true);
      }        
        
        private void doHandoff(Buffer buffer, Pad pad, boolean isPrerollFrame) {
          
            Caps caps = buffer.getCaps();
            Structure struct = caps.getStructure(0);
            
            int width = struct.getInteger("width");
            int height = struct.getInteger("height");
            if (width < 1 || height < 1) {
                return;

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            }
            
            int scaledWidth = currentImage.getWidth();
            if (keepAspect) {
                // Scale width according to pixel aspect ratio.
                Caps videoCaps = videoPad.getNegotiatedCaps();
                Structure capsStruct = videoCaps.getStructure(0);
                if (capsStruct.hasField("pixel-aspect-ratio")) {
                    Fraction pixelAspectRatio = capsStruct.getFraction("pixel-aspect-ratio");
                    scaledWidth = scaledWidth * pixelAspectRatio.getNumerator() / pixelAspectRatio.getDenominator();
                }
            }

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      //
      Element conv = ElementFactory.make("ffmpegcolorspace", "ColorConverter");
      Element videofilter = ElementFactory.make("capsfilter", "ColorFilter");
      StringBuilder caps = new StringBuilder("video/x-raw-rgb, bpp=32, depth=24, endianness=(int)4321, ");
      caps.append(mask);
      videofilter.setCaps(new Caps(caps.toString()));
      addMany(conv, videofilter, sink);
      Element.linkMany(conv, videofilter, sink);


      //
      // Link the ghost pads on the bin to the sink pad on the convertor

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org.gstreamer.elements.BufferDataAppSink

org.gstreamer.elements.BufferDataAppSink$AppSinkNewBufferListener

org.gstreamer.elements.BufferDataSink

org.gstreamer.elements.BufferDataSink$SinkNewBufferListener

org.gstreamer.elements.ByteDataAppSink$AppSinkNewBufferListener

org.gstreamer.elements.ByteDataSink$DataHandoffListener

org.gstreamer.elements.RGBDataAppSink

org.gstreamer.elements.RGBDataAppSink$AppSinkNewBufferListener

org.gstreamer.elements.RGBDataFileSink

org.gstreamer.elements.RGBDataSink

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