Default constructor for creating an is_null() MediaStreamVideoTrack object.

The copy constructor for MediaStreamVideoTrack.

Parameters:

[in]

other

A reference to a MediaStreamVideoTrack.

Constructs a MediaStreamVideoTrack from a Resource.

Parameters:

[in]

resource

A PPB_MediaStreamVideoTrack resource.

Constructs a MediaStreamVideoTrack that outputs given frames to a new video track, which will be consumed by Javascript.

A constructor used when you have received a PP_Resource as a return value that has had 1 ref added for you.

Parameters:

[in]

resource

A PPB_MediaStreamVideoTrack resource.

Closes the MediaStream video track, and disconnects it from video source.

After calling Close(), no new frames will be received.

Configures underlying frame buffers for incoming frames.

If the application doesn't want to drop frames, then the PP_MEDIASTREAMVIDEOTRACK_ATTRIB_BUFFERED_FRAMES should be chosen such that inter-frame processing time variability won't overrun the input buffer. If the buffer is overfilled, then frames will be dropped. The application can detect this by examining the timestamp on returned frames. If some attributes are not specified, default values will be used for those unspecified attributes. If Configure() is not called, default settings will be used. Example usage from plugin code:

 int32_t attribs[] = {
     PP_MEDIASTREAMVIDEOTRACK_ATTRIB_BUFFERED_FRAMES, 4,
     PP_MEDIASTREAMVIDEOTRACK_ATTRIB_NONE};
 track.Configure(attribs, callback);

Parameters:

[in]	attrib_list	A list of attribute name-value pairs in which each attribute is immediately followed by the corresponding desired value. The list is terminated by PP_MEDIASTREAMVIDEOTRACK_ATTRIB_NONE.
[in]	callback	A CompletionCallback to be called upon completion of Configure().

Returns:

An int32_t containing a result code from pp_errors.h. Returns PP_ERROR_INPROGRESS if there is a pending call of Configure() or GetFrame(), or the plugin holds some frames which are not recycled with RecycleFrame(). If an error is returned, all attributes and the underlying buffer will not be changed.

Gets attribute value for a given attribute name.

Parameters:

[in]	attrib	A PP_MediaStreamVideoTrack_Attrib for querying.
[out]	value	A int32_t for storing the attribute value.

Returns:

An int32_t containing a result code from pp_errors.h.

Gets the next video frame from the MediaStream track.

If internal processing is slower than the incoming frame rate, new frames will be dropped from the incoming stream. Once the input buffer is full, frames will be dropped until RecycleFrame() is called to free a spot for another frame to be buffered. If there are no frames in the input buffer, PP_OK_COMPLETIONPENDING will be returned immediately and the callback will be called when a new frame is received or some error happens.

Parameters:

[in]

callback

A CompletionCallbackWithOutput to be called upon completion of GetFrame(). If success, a VideoFrame will be passed into the completion callback function.

Returns:

An int32_t containing a result code from pp_errors.h. Returns PP_ERROR_NOMEMORY if max_buffered_frames frames buffer was not allocated successfully.

Returns the track ID of the underlying MediaStream video track.

Checks whether the underlying MediaStream track has ended.

Calls to GetFrame while the track has ended are safe to make and will complete, but will fail.

Checks whether a Resource is a MediaStream video track, to test whether it is appropriate for use with the MediaStreamVideoTrack constructor.

Parameters:

[in]

resource

A Resource to test.

Returns:

True if resource is a MediaStream video track.

Recycles a frame returned by GetFrame(), so the track can reuse the underlying buffer of this frame.

And the frame will become invalid. The caller should release all references it holds to frame and not use it anymore.

Parameters:

[in]

frame

A VideoFrame returned by GetFrame().

Returns:

An int32_t containing a result code from pp_errors.h.