text: //
  // libtgvoip is free and unencumbered public domain software.
  // For more information, see http://unlicense.org or the UNLICENSE file
  // you should have received with this source code distribution.
  //
  
  #ifndef LIBTGVOIP_VIDEOTOOLBOXENCODERSOURCE
  #define LIBTGVOIP_VIDEOTOOLBOXENCODERSOURCE
  
  #include "../../video/VideoSource.h"
  #include <CoreMedia/CoreMedia.h>
  #include <VideoToolbox/VideoToolbox.h>
  #include <vector>
  
  namespace tgvoip{
  	namespace video{
  		class VideoToolboxEncoderSource : public VideoSource{
  		public:
  			VideoToolboxEncoderSource();
  			virtual ~VideoToolboxEncoderSource();
  			virtual void Start() override;
  			virtual void Stop() override;
  			virtual void Reset(uint32_t codec, int maxResolution) override;
  			virtual void RequestKeyFrame() override;
  			virtual void SetBitrate(uint32_t bitrate) override;
  			void EncodeFrame(CMSampleBufferRef frame);
  			static std::vector<uint32_t> GetAvailableEncoders();
  		private:
  			void EncoderCallback(OSStatus status, CMSampleBufferRef buffer, VTEncodeInfoFlags flags);
  			void SetEncoderBitrateAndLimit(uint32_t bitrate);
  			bool needUpdateStreamParams=true;
  			uint32_t codec=0;
  			VTCompressionSessionRef session=NULL;
  			bool keyframeRequested=false;
  			uint32_t bitrateChangeRequested=0;
  			uint32_t lastBitrate=512*1024;
  		};
  	}
  }
  
  #endif /* LIBTGVOIP_VIDEOTOOLBOXENCODERSOURCE */
  