ExternalVideoFrame

The external video frame.

struct ExternalVideoFrame {
  ExternalVideoFrame()
      : type(VIDEO_BUFFER_RAW_DATA),
        format(VIDEO_PIXEL_DEFAULT),
        buffer(NULL),
        stride(0),
        height(0),
        cropLeft(0),
        cropTop(0),
        cropRight(0),
        cropBottom(0),
        rotation(0),
        timestamp(0),
        eglContext(NULL),
        eglType(EGL_CONTEXT10),
        textureId(0),
        metadataBuffer(NULL),
        metadataSize(0),
        alphaBuffer(NULL),
        fillAlphaBuffer(false),
        alphaStitchMode(0),
        d3d11Texture2d(NULL),
        textureSliceIndex(0){}
  enum EGL_CONTEXT_TYPE {
    EGL_CONTEXT10 = 0,
    EGL_CONTEXT14 = 1,
  };
  enum VIDEO_BUFFER_TYPE {
    VIDEO_BUFFER_RAW_DATA = 1,
    VIDEO_BUFFER_ARRAY = 2,
    VIDEO_BUFFER_TEXTURE = 3,
  };
  VIDEO_BUFFER_TYPE type;
  VIDEO_PIXEL_FORMAT format;
  void* buffer;
  int stride;
  int height;
  int cropLeft;
  int cropTop;
  int cropRight;
  int cropBottom;
  int rotation;
  long long timestamp;
  void *eglContext;
  EGL_CONTEXT_TYPE eglType;
  int textureId;
  float matrix[16];
  uint8_t* metadataBuffer;
  int metadataSize;
  uint8_t* alphaBuffer;
  bool fillAlphaBuffer;
  int alphaStitchMode;
  void *d3d11Texture2d;
  int textureSliceIndex;
};

Attributes

type

The video type. See VIDEO_BUFFER_TYPE.

format
The pixel format. See VIDEO_PIXEL_FORMAT.
buffer
Video frame buffer.
stride
Line spacing of the incoming video frame, which must be in pixels instead of bytes. For textures, it is the width of the texture.
height
Height of the incoming video frame.
eglContext
This parameter only applies to video data in Texture format.
  • When using the OpenGL interface (javax.microedition.khronos.egl.*) defined by Khronos, set eglContext to this field.
  • When using the OpenGL interface (android.opengl.*) defined by Android, set eglContext to this field.
eglType
This parameter only applies to video data in Texture format. Texture ID of the video frame.
textureId
This parameter only applies to video data in Texture format. Incoming 4 × 4 transformational matrix. The typical value is a unit matrix.
metadataBuffer
This parameter only applies to video data in Texture format. The MetaData buffer. The default value is NULL.
metadataSize
This parameter only applies to video data in Texture format. The MetaData size. The default value is 0.
d3d11Texture2d
This parameter only applies to video data in Windows Texture format. It represents a pointer to an object of type ID3D11Texture2D, which is used by a video frame.
alphaBuffer

The alpha channel data output by using portrait segmentation algorithm. This data matches the size of the video frame, with each pixel value ranging from [0,255], where 0 represents the background and 255 represents the foreground (portrait).

By setting this parameter, you can render the video background into various effects, such as transparent, solid color, image, video, etc.

fillAlphaBuffer
This parameter only applies to video data in BGRA or RGBA format. Whether to extract the alpha channel data from the video frame and automatically fill it into alphaBuffer:
  • true：Extract and fill the alpha channel data.
  • false: (Default) Do not extract and fill the Alpha channel data.
Note: For video data in BGRA or RGBA format, you can set the Alpha channel data in either of the following ways:
  • Automatically by setting this parameter to true.
  • Manually through the alphaBuffer parameter.
alphaStitchMode
When the video frame contains alpha channel data, it represents the relative position of alphaBuffer and the video frame. See ALPHA_STITCH_MODE.
textureSliceIndex
This parameter only applies to video data in Windows Texture format. It represents an index of an ID3D11Texture2D texture object used by the video frame in the ID3D11Texture2D array.
cropLeft
Raw data related parameter. The number of pixels trimmed from the left. The default value is 0.
This parameter only applies to raw video data.
cropTop
Raw data related parameter. The number of pixels trimmed from the top. The default value is 0.
This parameter only applies to raw video data.
cropRight
Raw data related parameter. The number of pixels trimmed from the right. The default value is 0.
This parameter only applies to raw video data.
cropBottom
Raw data related parameter. The number of pixels trimmed from the bottom. The default value is 0.
This parameter only applies to raw video data.
rotation
Raw data related parameter. The clockwise rotation of the video frame. You can set the rotation angle as 0, 90, 180, or 270. The default value is 0.
timestamp
Timestamp (ms) of the incoming video frame. An incorrect timestamp results in frame loss or unsynchronized audio and video.