Join GitHub today
GitHub is home to over 20 million developers working together to host and review code, manage projects, and build software together.
Fetching latest commit…
Cannot retrieve the latest commit at this time.
|Failed to load latest commit information.|
|common @ f8b3d91|
= GstOpenMAX = GstOpenMAX is a GStreamer plug-in that allows communication with OpenMAX IL components. OpenMAX IL is an industry standard that provides an abstraction layer for computer graphics, video, and sound routines. You'll need an OpenMAX IL implementation. Luckily STMicroelectronics has provided an useful sample implementation in the Bellagio project which is Open Source. For more information check: http://freedesktop.org/wiki/GstOpenMAX == Why is it good? == The easiest way to see OpenMAX IL is to think about OpenGL. both standards are controlled by the Khronos Group, both standards are open and royalty free. In a similar way you can think of Bellagio/OpenMAX IL as Mesa/Open GL. They are not official implementations, but they follow the standard. There are many Open Source encoders/decoders, but they all have different API's, so in order to use it you need to learn the API. In fact some projects as FFmpeg constantly change their API, so it makes things difficult. If you use Bellagio's omxil you don't have to worry about FFmpeg's API changes, those are wrapped inside a standard API. The standard has been reviewed by several parties including: Texas Instruments, ARM, ATI Technologies, Beatnik, Broadcom, Emuzed, Fraunhofer, Freescale, Infineon, Intel, Motorola, Nokia, NVIDIA, Philips, SKY MobileMedia, Samsung, Sasken, Siemens, ST Microelectronics, and Symbian. The gst-openmax project is a collaboration between Fluendo, Nokia, STMicroelectronics, Texas Instruments and the Open Source community. == What's bad? == Not all of the codecs are defined. For example Vorbis is defined, but not Theora. Of course it could be added as an extension, but that API wouldn't be set in stone == How to build omxil == Download the source code from: * http://omxil.sourceforge.net/ Or directly from: * http://dl.sourceforge.net/sourceforge/omxil/libomxil-B-0.3.3.tar.gz Install as usual: ./configure --prefix="$HOME/omx" make make install Register the components: $HOME/omx/bin/omxregister -v You'll get an output like this: Component OMX.st.volume.component registered Specific role OMX.st.volume.component registered Component OMX.st.audio_decoder.ogg.single registered Specific role OMX.st.audio_decoder.ogg.single registered Component OMX.st.alsa.alsasink registered Specific role OMX.st.alsa.alsasink registered Component OMX.st.audio_filereader registered Component OMX.st.audio_decoder registered Specific role OMX.st.audio_decoder.mp3 registered Specific role OMX.st.audio_decoder.ogg registered Specific role OMX.st.audio_decoder.aac registered Component OMX.st.video_decoder registered Specific role OMX.st.video_decoder.mpeg4 registered Specific role OMX.st.video_decoder.avc registered Component OMX.st.video_colorconv.ffmpeg registered Specific role OMX.st.video_colorconv.ffmpeg registered Component OMX.st.audio_decoder.mp3.mad registered Specific role OMX.st.audio_decoder.mp3.mad registered 8 OpenMAX IL ST static components with 11 roles succesfully scanned Make sure you have: * "OMX.st.audio_decoder.mp3.mad" for MP3 decoding * "OMX.st.audio_decoder.ogg.single" for Vorbis decoding * "OMX.st.video_decoder.mpeg4" for MPEG4 video decoding * "OMX.st.alsa.alsasink" for ALSA sound output == How to build gst-openmax == If you are fetching it from CVS: ./autogen.sh --noconfigure If you want to install it into your home directory: ./configure --prefix="$HOME/omx" make Then as root (depending on your prefix): make install == How to try it == export GST_PLUGIN_PATH=$HOME/omx/lib/gstreamer-0.10 export LD_LIBRARY_PATH=$HOME/omx/lib You'll be able to play videos with MP3, Vorbis, MPEG-4, H.264 or H.263 content using Bellagio's components. If you want to see what's happening: export GST_DEBUG=omx:4 == Links == * http://omxil.sourceforge.net/ * http://freedesktop.org/wiki/GstOpenMAX