Fix emulator build error

[platform/framework/web/chromium-efl.git] / services / media_session / README.md

diff --git a/services/media_session/README.md b/services/media_session/README.md
index 64ac936..de47d4f 100644 (file)
--- a/services/media_session/README.md
+++ b/services/media_session/README.md
@@ -7,6 +7,19 @@ Clients can use the Audio Focus API to request audio focus and observe changes
 through AudioFocusObserver. The Media Session API can be used to control
 playback and observe changes through MediaSessionObserver.
 
-For more details about controlling playback see [controlling Media Playback](https://chromium.googlesource.com/chromium/src/+/master/services/media_session/controlling_media_playback.md).
+For more details about controlling playback see [controlling Media Playback](https://chromium.googlesource.com/chromium/src/+/main/services/media_session/controlling_media_playback.md).
 
 TODO(beccahughes): Write docs about requesting audio focus.
+
+## Media Session IDs
+
+The Media Session service uses base::UnguessableToken for a number of different
+reasons, these are:
+
+* Request IDs: These identify a single media session
+* Group IDs: These group together a number of media sessions that should share
+  focus, this is usually per-app.
+* Source IDs: These identity a user/profile that created a media session
+
+Every media session has its own unique request ID and it may also have a group
+ID and a source ID.
\ No newline at end of file