Difference between revisions of "Raspberry Pi Fedora Remix Multimedia Demo Programs"
Chris Tyler (talk | contribs) (→Multimedia Demos) |
Chris Tyler (talk | contribs) (→Building the Demos) |
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# Select a demo. Change to that directory -- the directory name will be <code>~/hello_pi/''nameOfDemo''</code> -- for example, to change to the demo for the hello_audio program: <code>cd ~/hello_pi/hello_audio</code> | # Select a demo. Change to that directory -- the directory name will be <code>~/hello_pi/''nameOfDemo''</code> -- for example, to change to the demo for the hello_audio program: <code>cd ~/hello_pi/hello_audio</code> | ||
# Build the demo: <code>make</code> | # Build the demo: <code>make</code> | ||
| − | # The resulting program name will end in <code>.bin</code> -- run it by typing: <code>./*.bin</code> | + | # The resulting program name will end in <code>.bin</code> -- you can run it by typing: <code>./*.bin</code> |
# You can modify the programs by editing the C source code (files ending in <code>.c</code>) and recompiling the software by typing <code>make</code> | # You can modify the programs by editing the C source code (files ending in <code>.c</code>) and recompiling the software by typing <code>make</code> | ||
Revision as of 12:53, 5 March 2012
Multimedia Demos
There are four multimedia demo programs provided by the Raspberry Pi Foundation and package in the Remix:
- hello_world - the classic test program, that just prints "Hello, World!" on the screen
- hello_video - a simple H.264 video player
- hello_triangle - an OpenGL-ES demo program which displays a rolling cube with textures on each side
- hello_audio - an audio demo that plays a sine wave with a slow sine wave amplitude modulation
Building the Demos
Recommended steps:
- Ensure that the
raspberrypi-vc-demo-sourcepackage is installed (it's installed in the released image). - Install the C/C++ toolchain. If you have sufficient space (about 600M), it's recommended that you install the full set of development tools and libraries (
yum groupinstall "Development Tools" "Development Libraries"). Alternately, you could install a minimal set of tools (gcc, make, etc). (TODO: come up with the minimum set of tools/libraries needed for the demo code). - It's recommended that you build and run the code as a regular user:
- Make a personal copy of the source code in your home directory:
cp -R /usr/share/raspberypi-vc-demo-source/hello-pi ~ - As root, change the permissions on the vchiq device so that all users can access it:
chmod a+rw /dev/vchiq
- Make a personal copy of the source code in your home directory:
- Select a demo. Change to that directory -- the directory name will be
~/hello_pi/nameOfDemo-- for example, to change to the demo for the hello_audio program:cd ~/hello_pi/hello_audio - Build the demo:
make - The resulting program name will end in
.bin-- you can run it by typing:./*.bin - You can modify the programs by editing the C source code (files ending in
.c) and recompiling the software by typingmake
File Locations
In the Remix, the vc (video core) libraries are in /usr/lib and subdirectories, and the headers are in /usr/include; utilities are in /usr/bin and /usr/sbin. This is different from the Foundation's reference image, which has these files in subdirectories of /opt/vc. The move from /opt to the system directories reflects the fact that these libraries are part of the base system and not a 3rd-party add-on.
License Information
License information for the libraries and/or headers is contained in the corresponding header files.
