Adaptive bit-rate adjustment of multimedia communications channels using transport control protocol

摘要

A videoconferencing apparatus having a corresponding method and instruction program comprises a video codec to generate video data; a video packetizer to produce TCP packets of the video data; an audio codec to generate audio data; an audio packetizer to produce packets of the audio data; a transmit circuit to transmit the TCP packets; a receive circuit to receive a RTCP receiver report representing a number of the TCP packets of the video data received by a receiver; and a controller to generate an estimate of a number of the TCP packets of the video data transmitted but not yet received based on a difference between a number of the TCP packets of the video data transmitted by the transmit circuit and the number of the TCP packets of the video data received by the receiver, and control the video bit rate according to the estimate.