Agora C++ API Reference for All Platforms

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Classes | Public Types | Public Member Functions | List of all members
agora::rtc::IExtensionVideoFilter Class Referenceabstract

`#include <AgoraExtensions.h>`

Inherits agora::rtc::IVideoFilter.

## Classes
class | Control

## Public Types
enum | ProcessMode { kSync , kAsync }
enum | ProcessResult { kSuccess , kBypass , kDrop }

## Public Member Functions
virtual void | getProcessMode (ProcessMode &mode, bool &independent_thread)=0
virtual int | start (agora::agora_refptr< Control > control)=0
virtual int | stop ()=0
virtual void | getVideoFormatWanted (VideoFrameData::Type &type, RawPixelBuffer::Format &format)=0
virtual ProcessResult | pendVideoFrame (agora::agora_refptr< IVideoFrame > frame)
virtual ProcessResult | adaptVideoFrame (agora::agora_refptr< IVideoFrame > in, agora::agora_refptr< IVideoFrame > &out)
virtual bool | getRotationApplied ()
virtual bool | isExtensionFilter ()
virtual bool | adaptVideoFrame (const media::base::VideoFrame &capturedFrame, media::base::VideoFrame &adaptedFrame)
Public Member Functions inherited from agora::rtc::IVideoFilter
virtual void | setEnabled (bool enable)
virtual bool | isEnabled ()
virtual int | setProperty (const char *key, const void *buf, size_t buf_size)
virtual int | getProperty (const char *key, void *buf, size_t buf_size)
virtual bool | onDataStreamWillStart ()
virtual void | onDataStreamWillStop ()
virtual bool | isExternal ()
Public Member Functions inherited from agora::RefCountInterface
virtual void | AddRef () const =0
virtual RefCountReleaseStatus | Release () const =0
virtual bool | HasOneRef () const =0

## Additional Inherited Members
Protected Member Functions inherited from agora::RefCountInterface
virtual | ~RefCountInterface ()

## Detailed Description

The IExtensionVideoFilter class.

This class defines the interfaces that a external video extension provider can implement so as to be loaded by SDK as an "3rd party extension" for video pre- or post- processing.

## Member Enumeration Documentation

## ◆ ProcessMode

enum agora::rtc::IExtensionVideoFilter::ProcessMode

Enumerator
kSync |
kAsync |

## ◆ ProcessResult

enum agora::rtc::IExtensionVideoFilter::ProcessResult

Enumerator
kSuccess |
kBypass |
kDrop |

## Member Function Documentation

## ◆ getProcessMode()

virtual void agora::rtc::IExtensionVideoFilter::getProcessMode | ( | ProcessMode & | mode,
|  | bool & | independent_thread )
| pure virtual

SDK will invoke this API first to get the filter's requested process mode ProcessMode.

Parameters

  mode | [out] filter assign its desired the process mode ProcessMode
  independent_thread | deprecated. SDK will ignore this parameter.

Note
  If the filter implementation is not thread sensitive, we recommend to set the boolean to "false" to reduce thread context switching.

## ◆ start()

virtual int agora::rtc::IExtensionVideoFilter::start | ( | agora::agora_refptr< Control > | control | ) |
| pure virtual

SDK will invoke this API before feeding video frame data to the filter. Filter can perform its initialization/preparation job in this step.

Parameters

  control | object to IExtensionFilter::Control that pass to the filter which can be used for future interaction with the SDK

Returns
  error code

## ◆ stop()

virtual int agora::rtc::IExtensionVideoFilter::stop | ( |  | ) |
| pure virtual

SDK will invoke this API when the data stream is about to stop. Filter can perform cleanup jobs in this step.

Returns
  error code

## ◆ getVideoFormatWanted()

virtual void agora::rtc::IExtensionVideoFilter::getVideoFormatWanted | ( | VideoFrameData::Type & | type,
|  | RawPixelBuffer::Format & | format )
| pure virtual

SDK will invoke this API every time before sending data to the filter. Filter can desigante the type VideoFrameInfo::Type and format MemPixelBuffer::Format of the next frame. SDK will then try to perform type / format conversion before sending data to the filter.

Parameters

  type | requested type of the next frame
  format | requested formant of the next frame

## ◆ pendVideoFrame()

virtual ProcessResult agora::rtc::IExtensionVideoFilter::pendVideoFrame | ( | agora::agora_refptr< IVideoFrame > | frame | ) |
| inline virtual

SDK will invoke this API to send video frame to the filter if process mode is "Async". Filter invokes control's "deliverFrame" to send back the frame after processing.

Parameters

  frame | frame pending for processing

## ◆ adaptVideoFrame() [1/2]

virtual ProcessResult agora::rtc::IExtensionVideoFilter::adaptVideoFrame | ( | agora::agora_refptr< IVideoFrame > | in,
|  | agora::agora_refptr< IVideoFrame > & | out )
| inline virtual

SDK will invoke this API to send video frame to the filter if process mode is "Sync".

Parameters

  frame | frame pending for processing

## ◆ getRotationApplied()

virtual bool agora::rtc::IExtensionVideoFilter::getRotationApplied | ( |  | ) |
| inline virtual

## ◆ isExtensionFilter()

virtual bool agora::rtc::IExtensionVideoFilter::isExtensionFilter | ( |  | ) |
| inline virtual

This function indicates if the filter is implemented by third-party providers.

Note
  Do not override this function.

Returns
  - `true`: The filter is implemented by third-party providers.
  - `false`: otherwise.

Reimplemented from agora::rtc::IVideoFilter.

## ◆ adaptVideoFrame() [2/2]

virtual bool agora::rtc::IExtensionVideoFilter::adaptVideoFrame | ( | const media::base::VideoFrame & | capturedFrame,
|  | media::base::VideoFrame & | adaptedFrame )
| inline virtual

Adapts the video frame.

Parameters

  capturedFrame | The reference to the captured video frame that you want to adapt.
  adaptedFrame | The reference to the adapted video frame.

Returns
  - `true`: Success.
  - `false`: Failure, if, for example, the `IVideofilter` object drops the video frame.

Implements agora::rtc::IVideoFilterBase.