Design and implementation of a DVB-H IP decapsulator

The digital video broadcasting-handheld (DVB-H) standard determined by the European Telecommunications Standard Institute is based on the terrestrial broadcast system DVB-Terrestrial (DVB-T), which has allowed digital video to be incorporated into handheld device applications. DVB-H also makes coded orthogonal frequency division multiplexing, time slicing, and multi-protocol encapsulation-forward error correction (MPE-FEC) compatible with the existing broadcasting standard. We describe a DVB-H Internet Protocol (IP) decapsulator that can achieve time slicing and MPE, as well as cross platform compatibility, and is highly adaptable. Power consumption is always an issue in handheld devices, and time slicing effectively reduces the most serious DVB-H demodulator power consumption problems. The DVB-H protocol uses MPE to deliver information, and unlike other DVB protocols, the video and sound data of DVB-H are not packed directly into the MPEG-2 transport stream. Instead, they are packed into the IP datagram, MPE is performed, and then the data are delivered via the MPEG-2 transport stream. In this way, DVB-H is backward-compatible with DVB-T. We implemented the DVB-H IP decapsulator using pure Java language, which enables it to function across platforms. We specified a platform-adaptive layer to reduce the drive complexity between the Java virtual machine and the demodulator. Because DVB-H has a built-in IP decapsulator transport stream dispatcher module, it independently creates program-specific information and service information subdecoders. Therefore, the packet that recognizes the decoders can be obtained from the transport stream dispatcher while the registration of that specific packet is completed.