GStreamer Creating C Code applications
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GStreamer C Code Application
The gst-launch test utility is handy for verifying a GStreamer pipeline is setup correctly. However gst-launch is not a good choice to use in a shipping embedded Linux product. Instead, a GStreamer application is needed. One choice is to use GStreamer Deamon, which you can control using D-Bus. Another option is to role your own application.
This wiki documents how to create a GStreamer C code application using the Ridgerun's SDK. The applications is located in $(DEVDIR)/myapps, uses the Ridgerun classes for GStreamer, autotools, and general sdk installation into target. Like all GStreamer C code application, the application uses glib. The example application was tested using the Turrialba SDK running on a Leopardboard368 using a MT9P031 Aptina sensor.
The example application can be better understood by referring to the GStreamer documentation.
The source code to the GStreamer C code application can be retrieved using:
git clone https://github.com/RidgeRun/video-capture-application.git video-capture-application
GStreamer applications can have parsers, callbacks according to signals, read values from command lines and many other capabilities. In this case this is just a simple application that runs the following pipeline:
videotestsrc num-buffers=300 ! 'video/x-raw-yuv,format=(fourcc)NV12,width=640, height=480' ! dmaiaccel ! dmaienc_h264 ! queue ! qtmux ! filesink location=$FILENAME
where the FILENAME is the first command line parameter.
Application source code directory structure
video_capture_application/
├── Config
├── Makefile
└── src
├── autogen.sh
├── configure.ac
├── Makefile.am
├── README
└── src
├── Makefile.am
├── video_capture_application.c
└── video_capture.h
Compiling Application
ARM Compilation
The RidgeRun SDK makes it easy to cross compile for the ARM:
cd $DEVDIR/myapps git clone https://github.com/RidgeRun/video-capture-application.git video-capture-application cd video-capture-application make
When the application is installed it can be run at the target with the following command:
video_capture_application test_file.mov
After 300 frames have been processed, the file test_file.mov will contain the video.
x86 Compilation
You doin't need the RidgeRun SDK to build for the host. You do need GStreamer development libraries installed.
cd $HOME/work git clone https://github.com/RidgeRun/video-capture-application.git video-capture-application cd video-capture-application/src ./autogen.sh ./configure make
After compiling the application can be executed as any regular binary:
./video-capture-application video_test.mov
After 300 frames have been processed, the file test_file.mov will contain the video.
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