gstreamer媒体框架.pdf

Trend of Open Standard Media Framework - GStreamer Joseph Ku chiehfang.ku@ Outline ? Introduction ? OpenMAX ? GStreamer ? OpenMAX and GStreamer OpenMAX ? A standard for media library portability ? It is a royalty-free, cross-platform API. ? Providing comprehensive streaming media codec and application portability by enabling accelerated multimedia components to be developed, integrated and programmed across multiple operating systems and silicon platforms OpenMAX ? The OpenMAX API will be shipped with processors to enable library and codec implementers to rapidly and effectively make use of the full acceleration potential of new silicon - regardless of the underlying hardware architecture. ? Released by Khronos Group Architecture of OpenMAX ? OpenMAX intends to provide three interfaces: – OpenMAX IL (Integration Layer) ? Between a media framework such as DirectShow or GStreamer and a set of multimedia components (such as an audio or video codecs) – OpenMAX DL (Development Layer) ? Between physical hardware, such as DSP chips and CPUs, and software, like video codecs and 3D engines – OpenMAX AL (Application Layer) Architecture of OpenMAX Architecture of OpenMAX GStreamer ? GStreamer is a multimedia framework written in the C programming language with the type system based on GObject. – Glib 2.0 – /doc/API/2.0/gobject/index.ht ml ? GStreamer serves a host of multimedia applications, such as video editors, streaming media broadcasters, and media players. ? Good license – GNU Lesser General Public License – But the tools of GStreamer is GPL GStreamer ? Current stable release – Version 0.10.13 (update to 2007/06/27) ? Small core library of less than 150KB, about 100000 lines of code. ( core: 20000 lines) What is NOT GStreamer? ? Application – But can be controlled by YOUR application ? Player or encoder or streamer – But can do any and others ? GUI – You can have, or you cannot. It is your choice GStreamer Dependencies Glib 2.8.x LibXML 2.6.1x Liboil 0.3.x GStreamer Core