Created 7. Jami plugins (markdown)

Updated 0.-Introduction.md (markdown)

technical/0.-Introduction.md

@@ -15,6 +15,7 @@ Greetings people. In this part of the documentation, you will learn how Jami wor
     4. What is a DHTProxy
     5. Supporting SIP
     6. [Setup your own TURN server](https://git.jami.net/savoirfairelinux/ring-project/wikis/technical/3.6-Setup-your-own-TURN-server)
+    7. [Plugins](7. Jami plugins)
 
 4. Contribute
    1. Build instructions

technical/7. Jami plugins.md

+**NOTE: this page describes what is a Jami Plugin and how to install and use them.**
+
+# Jami Plugins
+
+As from September of 2020, Jami team has added plugins as a call/chat feature for Linux and Android users.
+This meaning that now they can personalize their call/chat experience by using one of our available plugins. 
+But that is not all, you can also transform your awesome ideas into a brand new plugin!
+
+To properly setup a plugin you must follow the step bellow.
+To `build` a plugin, please refer to build instructions at the end of this page.
+
+## How to use it?
+### Install / Uninstall
+A Jami plugin is a file of the type plugin-name.jpl, and it must be installed to your Jami.
+For Android You must go under Setting, enable plugins, and select a plugin file from your phone.
+Similarly, for Linux, one must go to Jami Prefences, enable plugins, and select a plugins file from your computer.
+
+Once installed, Jami will add your new plugin to the available plugins list.
+
+For Android uninstall, one must click on the plugin and a uninstall option will appear.
+For Linux, each plugins in plugins list shows a uninstall button.
+
+### Load / Unload
+Once installed, a plugins is not available for use yet. Plugins are libraries and must be loaded if you want to expose their functionalities.
+
+For Android and Linux, there is checkbox that indicates plugin's load state. You can load or unload it by clicking on this checkbox.
+
+### Change Parameters
+Each plugin has configurations, and some of them are editable by the user. For example, our Foreground Segmentation plugin allows the user to change the background image displayed.
+
+For client-gnome it is not yet possible to change those preferences, but for Android you can do so.
+Preferences are displayed in the same page one must access to uninstall a plugin.
+
+To take effect, the plugin has to be reloaded.
+
+### Use!
+Call plugins only take place if you turn them on during a call.
+For both Android and Linux you can do so by clicking on the plugins icon on your call screen.
+
+## How to build?
+
+### Dependencies
+If you want to make something with your video call, it is possible that you will do so with OpenCV and/or Tensorflow.
+So, before going to the plugin, it is necessary to build the plugin dependencies.
+
+#### OpenCV 4.1.1
+##### Android
+```bash
+cd ${DAEMON}
+export ANDROID_NDK=<NDK>
+export ANDROID_ABI=arm64-v8a
+export ANDROID_API=29
+export TOOLCHAIN=$ANDROID_NDK/toolchains/llvm/prebuilt/linux-x86_64
+export TARGET=aarch64-linux-android
+export CC=$TOOLCHAIN/bin/$TARGET$ANDROID_API-clang
+export CXX=$TOOLCHAIN/bin/$TARGET$ANDROID_API-clang++
+export AR=$TOOLCHAIN/bin/$TARGET-ar
+export LD=$TOOLCHAIN/bin/$TARGET-ld
+export RANLIB=$TOOLCHAIN/bin/$TARGET-ranlib
+export STRIP=$TOOLCHAIN/bin/$TARGET-strip
+export PATH=$PATH:$TOOLCHAIN/bin
+cd contrib
+mkdir native-${TARGET}
+cd native
+../bootstrap --build=x86_64-pc-linux-gnu --host=$TARGET$ANDROID_API --enable-opencv --enable-opencv_contrib
+make
+```
+##### Linux
+```bash
+cd ${DAEMON}/contrib/native
+./../bootstrap --enable-opencv --enable-opencv_contrib
+make
+```
+
+#### Tensorflow 2.1
+Dependencies:
+
+* Python 3
+* Bazel 0.29.1
+
+```bash
+git clone https://github.com/tensorflow/tensorflow.git
+cd tensorflow
+git checkout -b v2.1.0
+```
+
+Assemble instructions are available under [jami-plugins](https://review.jami.net/admin/repos/jami-plugins) README file
+
+#### Linux
+If you want to build Tensorflow C++ API with GPU suport, be sure to have a CUDA capable GPU and that you have 
+followed all installation steps for the Nvidia drivers, CUDA Toolkit, CUDNN, Tensor RT, that their versions 
+matches and that they are correct for the Tensorflow version you want to build. 
+
+The following links may be very helpfull:
+
+* https://www.tensorflow.org/install/source
+* https://developer.nvidia.com/cuda-gpus
+* https://developer.nvidia.com/cuda-toolkit-archive
+* https://developer.nvidia.com/cudnn
+
+
+`./configure`
+    
+##### LITE
+`bazel build //tensorflow/lite:libtensorflowlite.so`
+##### C++ API
+`bazel build --config=v1 --define framework_shared_object=false //tensorflow:libtensorflow_cc.so`
+#### Android - LITE
+Depencencie:
+
+* Android NDK 18r
+
+```bash
+./configure
+        >> Do you wish to build TensorFlow with XLA JIT support? [Y/n]: n
+        >> Do you wish to download a fresh release of clang? (Experimental) [y/N]: y
+        >> Would you like to interactively configure ./WORKSPACE for Android builds? [y/N]: y
+        >> Please specify the home path of the Android NDK to use. [Default is /home/<username>/Android/Sdk/ndk-bundle]: put the right path to ndk 18r
+```
+
+```bash
+bazel build //tensorflow/lite:libtensorflowlite.so --crosstool_top=//external:android/crosstool --cpu=armeabi-v7a --host_crosstool_top=@bazel_tools//tools/cpp:toolchain --cxxopt="-std=c++11"
+```
+
+```bash
+bazel build //tensorflow/lite:libtensorflowlite.so --crosstool_top=//external:android/crosstool --cpu=arm64-v8a --host_crosstool_top=@bazel_tools//tools/cpp:toolchain --cxxopt="-std=c++11"
+```
+
+### Plugin
+##### Android
+##### Linux
+
+## TODO
+### How it works
+
+Related articles:
+
++ https://jami.net/jami-plugins-foreground-segmentation-artificial-inteligence/