Tweak and add READMEs + remove refs to V1

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=165578518

Author: ojw28

README.md

@@ -9,37 +9,37 @@ and extend, and can be updated through Play Store application updates.
 
 ## Documentation ##
 
-* The [developer guide][] provides a wealth of information to help you get
-  started.
-* The [class reference][] documents the ExoPlayer library classes.
+* The [developer guide][] provides a wealth of information.
+* The [class reference][] documents ExoPlayer classes.
 * The [release notes][] document the major changes in each release.
+* Follow our [developer blog][] to keep up to date with the latest ExoPlayer
+  developments!
 
 [developer guide]: https://google.github.io/ExoPlayer/guide.html
 [class reference]: https://google.github.io/ExoPlayer/doc/reference
-[release notes]: https://github.com/google/ExoPlayer/blob/dev-v2/RELEASENOTES.md
+[release notes]: https://github.com/google/ExoPlayer/blob/release-v2/RELEASENOTES.md
+[developer blog]: https://medium.com/google-exoplayer
 
 ## Using ExoPlayer ##
 
-ExoPlayer modules can be obtained via JCenter. It's also possible to clone the
+ExoPlayer modules can be obtained from JCenter. It's also possible to clone the
 repository and depend on the modules locally.
 
-### Via JCenter ###
+### From JCenter ###
 
 The easiest way to get started using ExoPlayer is to add it as a gradle
-dependency. You need to make sure you have the JCenter and Google Maven
-repositories included in the `build.gradle` file in the root of your project:
+dependency. You need to make sure you have the JCenter and Google repositories
+included in the `build.gradle` file in the root of your project:
 
 ```gradle
 repositories {
     jcenter()
-    maven {
-        url "https://maven.google.com"
-    }
+    google()
 }
 ```
 
 Next add a gradle compile dependency to the `build.gradle` file of your app
-module. The following will add a dependency to the full ExoPlayer library:
+module. The following will add a dependency to the full library:
 
 ```gradle
 compile 'com.google.android.exoplayer:exoplayer:r2.X.X'
@@ -56,8 +56,8 @@ compile 'com.google.android.exoplayer:exoplayer-dash:r2.X.X'
 compile 'com.google.android.exoplayer:exoplayer-ui:r2.X.X'
 ```
 
-The available modules are listed below. Adding a dependency to the full
-ExoPlayer library is equivalent to adding dependencies on all of the modules
+The available library modules are listed below. Adding a dependency to the full
+library is equivalent to adding dependencies on all of the library modules
 individually.
 
 * `exoplayer-core`: Core functionality (required).
@@ -66,11 +66,16 @@ individually.
 * `exoplayer-smoothstreaming`: Support for SmoothStreaming content.
 * `exoplayer-ui`: UI components and resources for use with ExoPlayer.
 
-For more details, see the project on [Bintray][]. For information about the
-latest versions, see the [Release notes][].
+In addition to library modules, ExoPlayer has multiple extension modules that
+depend on external libraries to provide additional functionality. Some
+extensions are available from JCenter, whereas others must be built manaully.
+Browse the [extensions directory] and their individual READMEs for details.
 
+More information on the library and extension modules that are available from
+JCenter can be found on [Bintray][].
+
+[extensions directory][]: https://github.com/google/ExoPlayer/tree/release-v2/extensions/
 [Bintray]: https://bintray.com/google/exoplayer
-[Release notes]: https://github.com/google/ExoPlayer/blob/release-v2/RELEASENOTES.md
 
 ### Locally ###
 
@@ -109,15 +114,9 @@ compile project(':exoplayer-library-ui')
 
 #### Project branches ####
 
-  * The project has `dev-vX` and `release-vX` branches, where `X` is the major
-    version number.
-  * Most development work happens on the `dev-vX` branch with the highest major
-    version number. Pull requests should normally be made to this branch.
-  * Bug fixes may be submitted to older `dev-vX` branches. When doing this, the
-    same (or an equivalent) fix should also be submitted to all subsequent
-    `dev-vX` branches.
-  * A `release-vX` branch holds the most recent stable release for major version
-    `X`.
+* Development work happens on the `dev-v2` branch. Pull requests should
+  normally be made to this branch.
+* The `release-v2` branch holds the most recent release.
 
 #### Using Android Studio ####
 

demo/README.md

@@ -1,5 +1,5 @@
-# Demo application #
+# ExoPlayer main demo #
 
-This folder contains a demo application that uses ExoPlayer to play a number
+This is the main ExoPlayer demo application. It uses ExoPlayer to play a number
 of test streams. It can be used as a starting point or reference project when
 developing other applications that make use of the ExoPlayer library.

extensions/README.md

@@ -0,0 +1,5 @@
+# ExoPlayer extensions #
+
+ExoPlayer extensions are modules that depend on external libraries to provide
+additional functionality. Browse the individual extensions and their READMEs to
+learn more.

extensions/cronet/README.md

@@ -1,7 +1,5 @@
 # ExoPlayer Cronet extension #
 
-## Description ##
-
 The Cronet extension is an [HttpDataSource][] implementation using [Cronet][].
 
 [HttpDataSource]: https://google.github.io/ExoPlayer/doc/reference/com/google/android/exoplayer2/upstream/HttpDataSource.html
@@ -53,3 +51,10 @@ new DefaultDataSourceFactory(
     new CronetDataSourceFactory(...) /* baseDataSourceFactory argument */);
 ```
 respectively.
+
+## Links ##
+
+* [Javadoc][]: Classes matching `com.google.android.exoplayer2.ext.cronet.*`
+  belong to this module.
+
+[Javadoc]: https://google.github.io/ExoPlayer/doc/reference/index.html

extensions/ffmpeg/README.md

@@ -1,7 +1,5 @@
 # ExoPlayer FFmpeg extension #
 
-## Description ##
-
 The FFmpeg extension provides `FfmpegAudioRenderer`, which uses FFmpeg for
 decoding and can render audio encoded in a variety of formats.
 
@@ -140,3 +138,10 @@ then implement your own logic to use the renderer for a given track.
 [Android NDK]: https://developer.android.com/tools/sdk/ndk/index.html
 [#2781]: https://github.com/google/ExoPlayer/issues/2781
 [Supported formats]: https://google.github.io/ExoPlayer/supported-formats.html#ffmpeg-extension
+
+## Links ##
+
+* [Javadoc][]: Classes matching `com.google.android.exoplayer2.ext.ffmpeg.*`
+  belong to this module.
+
+[Javadoc]: https://google.github.io/ExoPlayer/doc/reference/index.html

extensions/flac/README.md

@@ -1,7 +1,5 @@
 # ExoPlayer Flac extension #
 
-## Description ##
-
 The Flac extension provides `FlacExtractor` and `LibflacAudioRenderer`, which
 use libFLAC (the Flac decoding library) to extract and decode FLAC audio.
 
@@ -82,3 +80,10 @@ Note: These instructions assume you're using `DefaultTrackSelector`. If you have
 a custom track selector the choice of `Renderer` is up to your implementation,
 so you need to make sure you are passing an `LibflacAudioRenderer` to the
 player, then implement your own logic to use the renderer for a given track.
+
+## Links ##
+
+* [Javadoc][]: Classes matching `com.google.android.exoplayer2.ext.flac.*`
+  belong to this module.
+
+[Javadoc]: https://google.github.io/ExoPlayer/doc/reference/index.html

extensions/gvr/README.md

@@ -1,7 +1,5 @@
 # ExoPlayer GVR extension #
 
-## Description ##
-
 The GVR extension wraps the [Google VR SDK for Android][]. It provides a
 GvrAudioProcessor, which uses [GvrAudioSurround][] to provide binaural rendering
 of surround sound and ambisonic soundfields.
@@ -26,9 +24,17 @@ locally. Instructions for doing this can be found in ExoPlayer's
 
 ## Using the extension ##
 
-* If using SimpleExoPlayer, override SimpleExoPlayer.buildAudioProcessors to
-  return a GvrAudioProcessor.
-* If constructing renderers directly, pass a GvrAudioProcessor to
-  MediaCodecAudioRenderer's constructor.
+* If using `DefaultRenderersFactory`, override
+  `DefaultRenderersFactory.buildAudioProcessors` to return a
+  `GvrAudioProcessor`.
+* If constructing renderers directly, pass a `GvrAudioProcessor` to
+  `MediaCodecAudioRenderer`'s constructor.
 
 [top level README]: https://github.com/google/ExoPlayer/blob/release-v2/README.md
+
+## Links ##
+
+* [Javadoc][]: Classes matching `com.google.android.exoplayer2.ext.gvr.*`
+  belong to this module.
+
+[Javadoc]: https://google.github.io/ExoPlayer/doc/reference/index.html

extensions/ima/README.md

@@ -1,7 +1,5 @@
 # ExoPlayer IMA extension #
 
-## Description ##
-
 The IMA extension is a [MediaSource][] implementation wrapping the
 [Interactive Media Ads SDK for Android][IMA]. You can use it to insert ads
 alongside content.
@@ -55,3 +53,10 @@ playback.
 
 [top level README]: https://github.com/google/ExoPlayer/blob/release-v2/README.md
 [sample ad tags]: https://developers.google.com/interactive-media-ads/docs/sdks/android/tags
+
+## Links ##
+
+* [Javadoc][]: Classes matching `com.google.android.exoplayer2.ext.ima.*`
+  belong to this module.
+
+[Javadoc]: https://google.github.io/ExoPlayer/doc/reference/index.html

extensions/mediasession/README.md

@@ -1,7 +1,5 @@
 # ExoPlayer MediaSession extension #
 
-## Description ##
-
 The MediaSession extension mediates between a Player (or ExoPlayer) instance
 and a [MediaSession][]. It automatically retrieves and implements playback
 actions and syncs the player state with the state of the media session. The
@@ -25,3 +23,10 @@ locally. Instructions for doing this can be found in ExoPlayer's
 [top level README][].
 
 [top level README]: https://github.com/google/ExoPlayer/blob/release-v2/README.md
+
+## Links ##
+
+* [Javadoc][]: Classes matching
+  `com.google.android.exoplayer2.ext.mediasession.*` belong to this module.
+
+[Javadoc]: https://google.github.io/ExoPlayer/doc/reference/index.html

extensions/okhttp/README.md

@@ -1,7 +1,5 @@
 # ExoPlayer OkHttp extension #
 
-## Description ##
-
 The OkHttp extension is an [HttpDataSource][] implementation using Square's
 [OkHttp][].
 
@@ -49,3 +47,10 @@ new DefaultDataSourceFactory(
     new OkHttpDataSourceFactory(...) /* baseDataSourceFactory argument */);
 ```
 respectively.
+
+## Links ##
+
+* [Javadoc][]: Classes matching `com.google.android.exoplayer2.ext.okhttp.*`
+  belong to this module.
+
+[Javadoc]: https://google.github.io/ExoPlayer/doc/reference/index.html