Tweak and add READMEs + remove refs to V1

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

README.md

@@ -9,21 +9,23 @@ 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
@@ -39,7 +41,7 @@ repositories {
 ```
 
 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 +58,8 @@ 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 +68,16 @@ 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 +116,9 @@ 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 ####
 

demos/README.md

+# ExoPlayer demos #
+
+This directory contains applications that demonstrate how to use ExoPlayer.
+Browse the individual demos and their READMEs to learn more.

demos/main/README.md

-# 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

+# 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

 # ExoPlayer Cronet extension #
 
-## Description ##
-
 The Cronet extension is an [HttpDataSource][] implementation using [Cronet][].
 
 [HttpDataSource]: https://google.github.io/ExoPlayer/doc/reference/com/google/android/exoplayer/upstream/HttpDataSource.html
@@ -56,3 +54,10 @@ 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

 # 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

 # 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

 # 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

 # 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/leanback/README.md

-# ExoPlayer Leanback Extension #
-
-## Description ##
+# ExoPlayer Leanback extension #
 
 This [Leanback][] Extension provides a [PlayerAdapter][] implementation for
 ExoPlayer.
@@ -24,3 +22,10 @@ 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.leanback.*`
+  belong to this module.
+
+[Javadoc]: https://google.github.io/ExoPlayer/doc/reference/index.html

extensions/mediasession/README.md

 # 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

 # 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

extensions/opus/README.md

 # ExoPlayer Opus extension #
 
-## Description ##
-
-The Opus extension provides `LibopusAudioRenderer`, which uses
-libopus (the Opus decoding library) to decode Opus audio.
+The Opus extension provides `LibopusAudioRenderer`, which uses libopus (the Opus
+decoding library) to decode Opus audio.
 
 ## Build instructions ##
 
@@ -86,3 +84,10 @@ 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 `LibopusAudioRenderer` 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.opus.*`
+  belong to this module.
+
+[Javadoc]: https://google.github.io/ExoPlayer/doc/reference/index.html

extensions/rtmp/README.md

 # ExoPlayer RTMP extension #
 
-## Description ##
-
 The RTMP extension is a [DataSource][] implementation for playing [RTMP][]
 streams using [LibRtmp Client for Android][].
 
@@ -41,3 +39,10 @@ application code are required. Alternatively, if you know that your application
 doesn't need to handle any other protocols, you can update any `DataSource`s and
 `DataSource.Factory` instantiations in your application code to use
 `RtmpDataSource` and `RtmpDataSourceFactory` directly.
+
+## Links ##
+
+* [Javadoc][]: Classes matching `com.google.android.exoplayer2.ext.rtmp.*`
+  belong to this module.
+
+[Javadoc]: https://google.github.io/ExoPlayer/doc/reference/index.html

extensions/vp9/README.md

 # ExoPlayer VP9 extension #
 
-## Description ##
-
-The VP9 extension provides `LibvpxVideoRenderer`, which uses
-libvpx (the VPx decoding library) to decode VP9 video.
+The VP9 extension provides `LibvpxVideoRenderer`, which uses libvpx (the VPx
+decoding library) to decode VP9 video.
 
 ## Build instructions ##
 
@@ -110,3 +108,10 @@ performed using a GL shader. To enable this mode, send the renderer a message of
 type `LibvpxVideoRenderer.MSG_SET_OUTPUT_BUFFER_RENDERER` with the
 `VpxVideoSurfaceView` as its object, instead of sending `MSG_SET_SURFACE` with a
 `Surface`.
+
+## Links ##
+
+* [Javadoc][]: Classes matching `com.google.android.exoplayer2.ext.vp9.*`
+  belong to this module.
+
+[Javadoc]: https://google.github.io/ExoPlayer/doc/reference/index.html

library/README.md

+# ExoPlayer library #
+
+The ExoPlayer library is split into multiple modules. See ExoPlayer's
+[top level README][] for more information about the available library modules
+and how to use them.
+
+[top level README]: https://github.com/google/ExoPlayer/blob/release-v2/README.md

library/all/README.md

+# ExoPlayer full library #
+
+An empty module that depends on all of the other library modules. Depending on
+the full library is equivalent to depending on all of the other library modules
+individually. See ExoPlayer's [top level README][] for more information.
+
+[top level README]: https://github.com/google/ExoPlayer/blob/release-v2/README.md
+
+## Links ##
+
+* [Javadoc][]: Note that this Javadoc is combined with that of other modules.
+
+[Javadoc]: https://google.github.io/ExoPlayer/doc/reference/index.html

library/core/README.md

+# ExoPlayer core library module #
+
+The core of the ExoPlayer library.
+
+## Links ##
+
+* [Javadoc][]: Note that this Javadoc is combined with that of other modules.
+
+[Javadoc]: https://google.github.io/ExoPlayer/doc/reference/index.html

library/dash/README.md

+# ExoPlayer DASH library module #
+
+Provides support for Dynamic Adaptive Streaming over HTTP (DASH) content. To
+play DASH content, instantiate a `DashMediaSource` and pass it to
+`ExoPlayer.prepare`.
+
+## Links ##
+
+* [Javadoc][]: Classes matching `com.google.android.exoplayer2.source.dash.*`
+  belong to this module.
+
+[Javadoc]: https://google.github.io/ExoPlayer/doc/reference/index.html

library/hls/README.md

+# ExoPlayer HLS library module #
+
+Provides support for HTTP Live Streaming (HLS) content. To play HLS content,
+instantiate a `HlsMediaSource` and pass it to `ExoPlayer.prepare`.
+
+## Links ##
+
+* [Javadoc][]: Classes matching `com.google.android.exoplayer2.source.hls.*`
+  belong to this module.
+
+[Javadoc]: https://google.github.io/ExoPlayer/doc/reference/index.html

library/smoothstreaming/README.md

+# ExoPlayer SmoothStreaming library module #
+
+Provides support for Smooth Streaming content. To play Smooth Streaming content,
+instantiate a `SsMediaSource` and pass it to `ExoPlayer.prepare`.
+
+## Links ##
+
+* [Javadoc][]: Classes matching
+  `com.google.android.exoplayer2.source.smoothstreaming.*` belong to this
+  module.
+
+[Javadoc]: https://google.github.io/ExoPlayer/doc/reference/index.html

library/ui/README.md

+# ExoPlayer UI library module #
+
+Provides UI components and resources for use with ExoPlayer.
+
+## Links ##
+
+* [Javadoc][]: Classes matching `com.google.android.exoplayer2.ui.*`
+  belong to this module.
+
+[Javadoc]: https://google.github.io/ExoPlayer/doc/reference/index.html