Package org.webrtc

Class JavaI420Buffer

java.lang.Object
org.webrtc.JavaI420Buffer
All Implemented Interfaces:
RefCounted, VideoFrame.Buffer, VideoFrame.I420Buffer
public class JavaI420Buffer extends Object implements VideoFrame.I420Buffer
Implementation of VideoFrame.I420Buffer backed by Java direct byte buffers.

  • Field Details

    • width

      private final int width

    • height

      private final int height

    • dataY

      private final ByteBuffer dataY

    • dataU

      private final ByteBuffer dataU

    • dataV

      private final ByteBuffer dataV

    • strideY

      private final int strideY

    • strideU

      private final int strideU

    • strideV

      private final int strideV

    • refCountDelegate

      private final RefCountDelegate refCountDelegate

  • Constructor Details

    • JavaI420Buffer

      private JavaI420Buffer(int width, int height, ByteBuffer dataY, int strideY, ByteBuffer dataU, int strideU, ByteBuffer dataV, int strideV, @Nullable Runnable releaseCallback)

  • Method Details

    • checkCapacity

      private static void checkCapacity(ByteBuffer data, int width, int height, int stride)

    • wrap

      public static JavaI420Buffer wrap(int width, int height, ByteBuffer dataY, int strideY, ByteBuffer dataU, int strideU, ByteBuffer dataV, int strideV, @Nullable Runnable releaseCallback)
      Wraps existing ByteBuffers into JavaI420Buffer object without copying the contents.

    • allocate

      public static JavaI420Buffer allocate(int width, int height)
      Allocates an empty I420Buffer suitable for an image of the given dimensions.

    • getWidth

      public int getWidth()
      Description copied from interface: VideoFrame.Buffer
      Resolution of the buffer in pixels.
      Specified by:
      getWidth in interface VideoFrame.Buffer

    • getHeight

      public int getHeight()
      Specified by:
      getHeight in interface VideoFrame.Buffer

    • getDataY

      public ByteBuffer getDataY()
      Description copied from interface: VideoFrame.I420Buffer
      Returns a direct ByteBuffer containing Y-plane data. The buffer capacity is at least getStrideY() * getHeight() bytes. The position of the returned buffer is ignored and must be 0. Callers may mutate the ByteBuffer (eg. through relative-read operations), so implementations must return a new ByteBuffer or slice for each call.
      Specified by:
      getDataY in interface VideoFrame.I420Buffer

    • getDataU

      public ByteBuffer getDataU()
      Description copied from interface: VideoFrame.I420Buffer
      Returns a direct ByteBuffer containing U-plane data. The buffer capacity is at least getStrideU() * ((getHeight() + 1) / 2) bytes. The position of the returned buffer is ignored and must be 0. Callers may mutate the ByteBuffer (eg. through relative-read operations), so implementations must return a new ByteBuffer or slice for each call.
      Specified by:
      getDataU in interface VideoFrame.I420Buffer

    • getDataV

      public ByteBuffer getDataV()
      Description copied from interface: VideoFrame.I420Buffer
      Returns a direct ByteBuffer containing V-plane data. The buffer capacity is at least getStrideV() * ((getHeight() + 1) / 2) bytes. The position of the returned buffer is ignored and must be 0. Callers may mutate the ByteBuffer (eg. through relative-read operations), so implementations must return a new ByteBuffer or slice for each call.
      Specified by:
      getDataV in interface VideoFrame.I420Buffer

    • getStrideY

      public int getStrideY()
      Specified by:
      getStrideY in interface VideoFrame.I420Buffer

    • getStrideU

      public int getStrideU()
      Specified by:
      getStrideU in interface VideoFrame.I420Buffer

    • getStrideV

      public int getStrideV()
      Specified by:
      getStrideV in interface VideoFrame.I420Buffer

    • toI420

      public VideoFrame.I420Buffer toI420()
      Description copied from interface: VideoFrame.Buffer
      Returns a memory-backed frame in I420 format. If the pixel data is in another format, a conversion will take place. All implementations must provide a fallback to I420 for compatibility with e.g. the internal WebRTC software encoders.

      Conversion may fail, for example if reading the pixel data from a texture fails. If the conversion fails, null is returned.

      Specified by:
      toI420 in interface VideoFrame.Buffer

    • retain

      public void retain()
      Description copied from interface: RefCounted
      Increases ref count by one.
      Specified by:
      retain in interface RefCounted
      Specified by:
      retain in interface VideoFrame.Buffer

    • release

      public void release()
      Description copied from interface: RefCounted
      Decreases ref count by one. When the ref count reaches zero, resources related to the object will be freed.
      Specified by:
      release in interface RefCounted
      Specified by:
      release in interface VideoFrame.Buffer

    • cropAndScale

      public VideoFrame.Buffer cropAndScale(int cropX, int cropY, int cropWidth, int cropHeight, int scaleWidth, int scaleHeight)
      Description copied from interface: VideoFrame.Buffer
      Crops a region defined by `cropx`, `cropY`, `cropWidth` and `cropHeight`. Scales it to size `scaleWidth` x `scaleHeight`.
      Specified by:
      cropAndScale in interface VideoFrame.Buffer

    • cropAndScaleI420

      public static VideoFrame.Buffer cropAndScaleI420(VideoFrame.I420Buffer buffer, int cropX, int cropY, int cropWidth, int cropHeight, int scaleWidth, int scaleHeight)

    • nativeCropAndScaleI420

      private static void nativeCropAndScaleI420(ByteBuffer srcY, int srcStrideY, ByteBuffer srcU, int srcStrideU, ByteBuffer srcV, int srcStrideV, int cropX, int cropY, int cropWidth, int cropHeight, ByteBuffer dstY, int dstStrideY, ByteBuffer dstU, int dstStrideU, ByteBuffer dstV, int dstStrideV, int scaleWidth, int scaleHeight)