| With the development of embedded technology and the gradual growth of the wireless fast data communication need, the multimedia applications of voice and video attract more and more attention. There is an urgent need for a product that can meet the demand for high-quality voice and video communication and can greatly reduce consumer’s cost. Therefore, the development of voice and video multimedia applications has a broad space for development. The continuous development and improvement of the embedded processor architecture lays the hardware foundation for the development of multimedia applications, DM3730processor based on ARM+DSP heterogeneous dual-core architecture is specifically designed for the embedded open multimedia communication. With regard to operating system, the microkernel-based QNX real-time operating system has been gradually developed in the field of embedded terminals and has occupied a place in the field of commnunication because of its characteristics of real-time, security and reliability.VoIP technology is more and more widely applied because of its economic, flexible and feature-rich advantages, combined with wireless technology, wireless VoIP communication technology becomes one of the most important trends in th field. Based on the research of existing wireless VoIP communication technology, this thesis carries out the reaserch on the voice and video communication system based on the heterogeneous dual-core platform for the actual situation. The system adopts the modular design method, including several main parts of the DaVinci software module, the SIP signaling control module and network transmission module and so on. This system can greatly improve the consumer’s experience of embedded voice and video realtime communication.The thesis profoundly analyzes the heterogeneous dual-core processor architecture and its software development model, combined with the VoIP communication technology of the voice and video multimedia, and finally accomplishes the system design. The system completes the entire system demonstration program and determines the main technical points of various parts, and then selects DaVinci software framework for the system development based on the characteristics of heterogeneous dual-core processor hardware, brings about the design from the underlying voice and video algorithm libraries wrapped by the xDM standard to the upper visible VoIP communication application development based on the the DaVinci software design principles and norms. The system adopts the microkernel-based QNX embedded real-time operating system as the operating system on the ARM core, and carries through operating interface development of the terminal development board throught the cross-platform QT interface-designing software to measure up the control of the communication system and voice and video features which is man-machine interface-friendly. Eventually, builds the OpenSIPS server in PC and completes the implementation of SIP protocol module in the terminal development board. Through the system functions and performance tested, the results show that the entire system can be running well, which achieve the original intention of the thesis design. Ultimately, the system can be carried out voice and video communication. |
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