Add basic documentation for plugins

Signed-off-by: Manuel Bachmann <manuel.bachmann@iot.bzh>

1 files changed, 53 insertions, 0 deletions

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+# Overview of plugins shipped with AFB-Daemon
+    Version: 1
+    Date:    30 May 2016
+    Author:  Manuel Bachmann
+
+## List of plugins
+  Here are the plugins shipped in the source tree:
+ * Audio _(2 backends: ALSA/PulseAudio)_
+ * Radio _(1 backend: RTLSDR RTL2832U)_
+ * Media _(1 backend: Rygel UPnP)_
+
+All plugins may not be built, depending on the development libraries present on the system at build time.
+
+## Detail of plugins
+
+ ### Audio
+
+A sample Audio plugin with 2 backends:
+ * ALSA (mandatory)
+ * PulseAudio (optional)
+
+_(if PulseAudio development libraries are not found at build time, only ALSA will be available)_
+
+_(if a PulseAudio server is not found at runtime, the plugin will dynamically fall back to ALSA)_
+
+_(a specifc backend can be forced by using this syntax before running afb-daemon : **$ export AFB_AUDIO_OUTPUT=Alsa**)_
+
+This plugin is able to initialize a specific soundcard, define volume levels, channels (mono/stereo...), mute sound, and play a 22,050 Hz PCM stream.
+
+Sample applications: **[afb-radio](https://github.com/iotbzh/afb-radio)**
+
+ ### Radio
+
+A sample AM/FM Radio plugin with 1 backend:
+ * RTLSDR - Realtek RTL2832U dongles (mandatory)
+
+_(if rtlsdr development libraries are not found at build time, this plugin will not be built)_
+
+This plugin is able to initialize specific RTL2832U dongles, switch between AM/FM modes, define frequency, mute sound, and play sound (by using the **audio** plugin).
+
+Sample applications: **[afb-radio](https://github.com/iotbzh/afb-radio)**
+
+ ### Media
+
+A sample Media Server plugin with 1 backend:
+ * Rygel
+
+_(if GUPnP/GSSDP development libraries are not fund at build time, this plugin will not be built)_
+
+This plugin is able to detect a local Rygel UPnP media server, list audio files, select an audio file for playback, play/pause/seek in this file, upload an audio file to the server.
+
+Sample applications: **[afb-radio](https://github.com/iotbzh/afb-radio)**
+