H.264 Encoder Optimization Based On DM642 PCI

H.264 is an emerging video coding standard,which aims at compressing high-quality video contents at low-bit rates.H.264 uses the same hybrid block-based motion compensation and transformation coding model as some existing standards.Furthermore,a number of new features and capabilities have been introduced in H.264 to improve the compression efficiency.The complexity of H.264 standard poses a large amount of challenges to implementing the encoder/decoder in real-time.Based on analyzing and demonstrating the technical highlights of H.264 standard deeply,the paper proposed a real-time H.264 encoder algorithm at optimizing and improving program.It outlines the working principle of each module of DM642 PCI briefly in which the TMS320DM642 is the core processor,and analyzes the overall procedural framework and algorithm characteristics of the reference software T264 supporting H.264, and its feasibility transplanted to the platform of DM642 PCI.Finally,through the reasonable optimization of the project and program level,the algorithm improvement,the deletion and modification of redundant programs,completing of auxiliary functions,the optimization,such as allocating memory reasonably,using EDMA,parallel software,the introductions of arrangement,the usage of inline functions,etc,pointing to the hardware features of TMS320DM642 processor,the source code of T264 is transplanted to the platform of TMS320DM642 processor successfully and the real-time acquisition of real-time encoding of baseline profile video images in H.264 are implemented.Experiments show that under the premise of ensuring the subjective and objective quality of the video images,captured and encoded CIF images can be displayed fluently with the bit-rate of 553kbps,and the image compression ratio ranges from 50 to 200.