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Created page with '== 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 j…'
== 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_audo - an audio demo that plays a sine wave with a slow sine wave amplitude modulation
== Building the Demos ==
Recommended steps:
# Ensure that the <code>raspberrypi-vc-demo-source</code> package 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 (<code>yum groupinstall "Development Tools" "Development Libraries"</code>). 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: <code>cp -R /usr/share/raspberypi-vc-demo-source/hello-pi ~</code>
## As root, change the permissions on the vchiq device so that all users can access it: <code>chmod a+rw /dev/vchiq</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>
# The resulting program name will end in <code>.bin</code> -- 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>
== File Locations ==
In the Remix, the vc (video core) libraries are in <code>/usr/lib</code> and subdirectories, and the headers are in <code>/usr/include</code>; utilities are in <code>/usr/bin</code> and <code>/usr/sbin</code>. This is different from the Foundation's reference image, which has these files in subdirectories of <code>/opt/vc</code>. The move from <code>/opt</code> 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 is contained in the corresponding header files.
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_audo - an audio demo that plays a sine wave with a slow sine wave amplitude modulation
== Building the Demos ==
Recommended steps:
# Ensure that the <code>raspberrypi-vc-demo-source</code> package 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 (<code>yum groupinstall "Development Tools" "Development Libraries"</code>). 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: <code>cp -R /usr/share/raspberypi-vc-demo-source/hello-pi ~</code>
## As root, change the permissions on the vchiq device so that all users can access it: <code>chmod a+rw /dev/vchiq</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>
# The resulting program name will end in <code>.bin</code> -- 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>
== File Locations ==
In the Remix, the vc (video core) libraries are in <code>/usr/lib</code> and subdirectories, and the headers are in <code>/usr/include</code>; utilities are in <code>/usr/bin</code> and <code>/usr/sbin</code>. This is different from the Foundation's reference image, which has these files in subdirectories of <code>/opt/vc</code>. The move from <code>/opt</code> 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 is contained in the corresponding header files.
