@startuml

autonumber

box "Platform" #LightGreen
participant rialtoClient
end box

box "Platform" #LightBlue
participant rialtoServer
participant GStreamer_server
participant Ocdm
end box

Gstreamer_server   ->  rialtoServer:      decrypt(buffer)

rialtoServer	   ->  GStreamer_server:  gst_buffer_get_protection_meta(buffer)
 
opt Protection Meta exists (Frame encrypted)
 
rialtoServer       ->  rialtoServer:      Extract frame's metadata

opt media_keys.key_system == "com.netflix.playready"
rialtoServer       ->  Ocdm:              opencdm_select_key_id(ocdm_session, kid)
end

rialtoServer       ->  Ocdm:              opencdm_gstreamer_session_decrypt(ocdm_session, gst_buffer, subsample_info, iv, key, init_with_last_15)
end 

rialtoServer       ->  GStreamer_server:  gst_app_src_push_buffer(src, gst_buffer)
rialtoServer       ->  rialtoServer:      'Remove' frame from shm

opt First video frame pushed at start of playback / after seek
note across: Not currently implemented
rialtoServer       --/ rialtoClient:      notifyFrameReady(frame_timestamp)
end

opt Appsrc data exhausted from shm
opt (status == EOS) for this appsrc
rialtoServer       ->  GStreamer_server:      notify EOS
else Not EOS
rialtoServer       --/ rialtoClient:      notifyNeedMediaData(...)
end
end

end

@enduml