README updates for remaining ExoPlayer modules

PiperOrigin-RevId: 402287125

extensions/ima/README.md

@@ -1,8 +1,8 @@
-# ExoPlayer IMA extension
+# ExoPlayer IMA module
 
-The IMA extension is an [AdsLoader][] implementation wrapping the
+The ExoPlayer IMA module provides an [AdsLoader][] implementation wrapping the
-[Interactive Media Ads SDK for Android][IMA]. You can use it to insert ads
+[Interactive Media Ads SDK for Android][IMA]. You can use it to insert ads into
-alongside content.
+content played using ExoPlayer.
 
 [IMA]: https://developers.google.com/interactive-media-ads/docs/sdks/android/
 [AdsLoader]: https://exoplayer.dev/doc/reference/index.html?com/google/android/exoplayer2/source/ads/AdsLoader.html
@@ -25,12 +25,11 @@ locally. Instructions for doing this can be found in the [top level README][].
 
 ## Using the module
 
-To use the extension, follow the instructions on the
+To use the module, follow the instructions on the
 [Ad insertion page](https://exoplayer.dev/ad-insertion.html#declarative-ad-support)
 of the developer guide. The `AdsLoaderProvider` passed to the player's
 `DefaultMediaSourceFactory` should return an `ImaAdsLoader`. Note that the IMA
-extension only supports players which are accessed on the application's main
+module only supports players that are accessed on the application's main thread.
-thread.
 
 Resuming the player after entering the background requires some special
 handling when playing ads. The player and its media source are released on
@@ -46,8 +45,8 @@ position before preparing the new player instance. Finally, it is important to
 call `ImaAdsLoader.release()` when playback has finished and will not be
 resumed.
 
-You can try the IMA extension in the ExoPlayer demo app, which has test content
+You can try the IMA module in the ExoPlayer demo app, which has test content in
-in the "IMA sample ad tags" section of the sample chooser. The demo app's
+the "IMA sample ad tags" section of the sample chooser. The demo app's
 `PlayerActivity` also shows how to persist the `ImaAdsLoader` instance and the
 player position when backgrounded during ad playback.
 

extensions/workmanager/README.md

@@ -1,6 +1,6 @@
-# ExoPlayer WorkManager extension
+# ExoPlayer WorkManager module
 
-This extension provides a Scheduler implementation which uses [WorkManager][].
+This module provides a `Scheduler` implementation that uses [WorkManager][].
 
 [WorkManager]: https://developer.android.com/topic/libraries/architecture/workmanager.html
 
@@ -19,3 +19,10 @@ Alternatively, you can clone this GitHub project and depend on the module
 locally. Instructions for doing this can be found in the [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.workmanager.*`
+    belong to this module.
+
+[Javadoc]: https://exoplayer.dev/doc/reference/index.html

library/all/README.md

@@ -1,8 +1,8 @@
 # ExoPlayer full library
 
-An empty module that depends on all of the other library modules. Depending on
+An empty module that depends on all of the other ExoPlayer library modules.
-the full library is equivalent to depending on all of the other library modules
+Depending on the full library is equivalent to depending on all of the other
-individually. See the [top level README][] for more information.
+library modules individually. See the [top level README][] for more information.
 
 [top level README]: https://github.com/google/ExoPlayer/blob/release-v2/README.md
 

library/core/README.md

@@ -1,6 +1,28 @@
-# ExoPlayer core library module
+# ExoPlayer module
 
-The core of the ExoPlayer library.
+This module provides `ExoPlayer`, the `Player` implementation for local media
+playback on Android.
+
+## Getting the module
+
+The easiest way to get the module is to add it as a gradle dependency:
+
+```gradle
+implementation 'com.google.android.exoplayer:exoplayer-core:2.X.X'
+```
+
+where `2.X.X` is the version, which must match the version of the other media
+modules being used.
+
+Alternatively, you can clone this GitHub project and depend on the module
+locally. Instructions for doing this can be found in the [top level README][].
+
+[top level README]: https://github.com/google/ExoPlayer/blob/release-v2/README.md
+
+## Using the module
+
+The [developer guide](https://exoplayer.dev/hello-world.html) documents how to
+get started.
 
 ## Links