Apparatus and method for converting control information
Picture and speech communication between plural terminals connected to different networks, such as a circuit-switched network and IP network. A converting apparatus 400 for control information or media information for picture/speech communications is provided across first and second terminals 301, 302 connected to respective different types of networks. Converting apparatus 400 includes control information converter 420 , transcoder 450 and ability information converter 460 . In case the ability information extracted from the decoding information, received from the first terminal 301 , is not coincident to the ability information extracted from the call control information received from the second terminal 302 , it is further checked whether or not there is picture format size coincidence. If the picture format size coincidence persists in one direction, processing is carried out for converting part of the decoding information or the control information, without causing the operations of the transcoder. In case there is no picture format size coincidence, the transcoder 450 is booted to convert the bitstream.
1. An apparatus for converting control information or the media information for picture/speech communication between first and second terminals connected to respective different types of networks, comprising
a converter for effecting converting processing in a first direction for converting decoding information acquired from said first terminal into call control information to output the resulting call control information to said second terminal; and
for effecting converting processing in a second direction for converting call control information acquired from said second terminal into decoding information to output the resulting decoding information to said first terminal, wherein
at least Decoder Configuration Information DCI is received as the decoding information from said first terminal employing MPEG-4 as a system for encoding a moving picture for compression, and is converted into the call control information.
2. A method for converting control information or media information for picture/speech communication between first and second terminals connected to respective different types of networks, comprising
a first converting step of a converting apparatus, provided between said terminals, for converting decoding information acquired from said first terminal into call control information, to output the resulting call control information to said second terminal; and
a second converting step of said converting apparatus, for converting the call control information acquired from said second terminal into the decoding information, to output the resulting decoding information to said first terminal, wherein
at least the Decoder Configuration Information DCI is received as the decoding information from said first terminal employing MPEG-4 as a system for encoding a moving picture for compression, and is converted into the call control information.