GstVideoAggregator — Base class for video aggregators

Types and Values


VideoAggregator can accept AYUV, ARGB and BGRA video streams. For each of the requested sink pads it will compare the incoming geometry and framerate to define the output parameters. Indeed output video frames will have the geometry of the biggest incoming video stream and the framerate of the fastest incoming one.

VideoAggregator will do colorspace conversion.

Zorder for each input stream can be configured on the GstVideoAggregatorPad.


Types and Values

struct GstVideoAggregator

struct GstVideoAggregator {
  GstAggregator aggregator;

  /* Output caps */
  GstVideoInfo info;


GstAggregator aggregator;


GstVideoInfo info;

The GstVideoInfo representing the currently set srcpad caps.


struct GstVideoAggregatorClass

struct GstVideoAggregatorClass {
  gboolean           disable_frame_conversion;

  gboolean           (*update_info)               (GstVideoAggregator *  videoaggregator,
                                                   GstVideoInfo       *  info);
  GstFlowReturn      (*aggregate_frames)          (GstVideoAggregator *  videoaggregator,
                                                   GstBuffer          *  outbuffer);
  GstFlowReturn      (*get_output_buffer)         (GstVideoAggregator *  videoaggregator,
                                                   GstBuffer          ** outbuffer);
  gboolean           (*negotiated_caps)           (GstVideoAggregator *  videoaggregator,
                                                   GstCaps            *  caps);


gboolean disable_frame_conversion;

Optional. Allows subclasses to disable the frame colorspace conversion feature


update_info ()

Optional. Lets subclasses update the src GstVideoInfo representing the src pad caps before usage.


aggregate_frames ()

Lets subclasses aggregate frames that are ready. Subclasses should iterate the GstElement.sinkpads and use the already mapped GstVideoFrame from GstVideoAggregatorPad.aggregated_frame or directly use the GstBuffer from GstVideoAggregatorPad.buffer if it needs to map the buffer in a special way. The result of the aggregation should land in outbuffer .


get_output_buffer ()

Optional. Lets subclasses provide a GstBuffer to be used as outbuffer of the aggregate_frames vmethod.


negotiated_caps ()

Optional. Notifies subclasses what caps format has been negotiated