Release notes

### Unreleased changes

*   Core library:
    *   Add `ExoPlayer.isTunnelingEnabled` to check if tunneling is enabled for
        the currently selected tracks
        ([#2518](https://github.com/google/ExoPlayer/issues/2518)).
    *   Use `SingleThreadExecutor` for releasing `AudioTrack` instances to avoid
        OutOfMemory errors when releasing multiple players at the same time
        ([#10057](https://github.com/google/ExoPlayer/issues/10057)).
    *   Limit parallel download removals to 1 to avoid excessive thread creation
        ([#10458](https://github.com/google/ExoPlayer/issues/10458)).
*   Audio:
    *   Adds `AudioOffloadListener.onExperimentalOffloadedPlayback` for the
        AudioTrack offload state.
        ([#134](https://github.com/androidx/media/issues/134)).
    *   Make `AudioTrackBufferSizeProvider` a public interface.
*   Metadata:
    *   `MetadataRenderer` can now be configured to render metadata as soon as
        they are available. Create an instance with
        `MetadataRenderer(MetadataOutput, Looper, MetadataDecoderFactory,
        boolean)` to specify whether the renderer will output metadata early or
        in sync with the player position.
*   DASH:
    *   Parse `EventStream.presentationTimeOffset` from manifests
        ([#10460](https://github.com/google/ExoPlayer/issues/10460)).
*   UI:
    *   Use current overrides of the player as preset in
        `TrackSelectionDialogBuilder`
        ([#10429](https://github.com/google/ExoPlayer/issues/10429)).
*   Session:
    *   Ensure commands are always executed in the correct order even if some
        require asynchronous resolution
        ([#85](https://github.com/androidx/media/issues/85)).
    *   Add `DefaultNotificationProvider.Builder` to build
        `DefaultNotificationProvider` instances. The builder can configure the
        notification ID, the notification channel ID and the notification
        channel name used by the provider. Also, add method
        `DefaultNotificationProvider.setSmallIcon(int)` to set the notifications
        small icon ([#104](https://github.com/androidx/media/issues/104)).
    *   Ensure commands sent before `MediaController.release()` are not dropped
        ([#99](https://github.com/androidx/media/issues/99)).
    *   `SimpleBitmapLoader` can load bitmap from `file://` URIs
        ([#108](https://github.com/androidx/media/issues/108)).
*   RTSP:
    *   Add H263 fragmented packet handling
        ([#119](https://github.com/androidx/media/pull/119)).

### 1.0.0-beta02 (2022-07-21)

This release corresponds to the
[ExoPlayer 2.18.1 release](https://github.com/google/ExoPlayer/releases/tag/r2.18.1).

*   Core library:
    *   Ensure that changing the `ShuffleOrder` with `ExoPlayer.setShuffleOrder`
        results in a call to `Player.Listener#onTimelineChanged` with
        `reason=Player.TIMELINE_CHANGE_REASON_PLAYLIST_CHANGED`
        ([#9889](https://github.com/google/ExoPlayer/issues/9889)).
    *   For progressive media, only include selected tracks in buffered position
        ([#10361](https://github.com/google/ExoPlayer/issues/10361)).
    *   Allow custom logger for all ExoPlayer log output
        ([#9752](https://github.com/google/ExoPlayer/issues/9752)).
    *   Fix implementation of `setDataSourceFactory` in
        `DefaultMediaSourceFactory`, which was non-functional in some cases
        ([#116](https://github.com/androidx/media/issues/116)).
*   Extractors:
    *   Fix parsing of H265 short term reference picture sets
        ([#10316](https://github.com/google/ExoPlayer/issues/10316)).
    *   Fix parsing of bitrates from `esds` boxes
        ([#10381](https://github.com/google/ExoPlayer/issues/10381)).
*   DASH:
    *   Parse ClearKey license URL from manifests
        ([#10246](https://github.com/google/ExoPlayer/issues/10246)).
*   UI:
    *   Ensure TalkBack announces the currently active speed option in the
        playback controls menu
        ([#10298](https://github.com/google/ExoPlayer/issues/10298)).
*   RTSP:
    *   Add VP8 fragmented packet handling
        ([#110](https://github.com/androidx/media/pull/110)).
    *   Support frames/fragments in VP9
        ([#115](https://github.com/androidx/media/pull/115)).
*   Leanback extension:
    *   Listen to `playWhenReady` changes in `LeanbackAdapter`
        ([10420](https://github.com/google/ExoPlayer/issues/10420)).
*   Cast:
    *   Use the `MediaItem` that has been passed to the playlist methods as
        `Window.mediaItem` in `CastTimeline`
        ([#25](https://github.com/androidx/media/issues/25),
        [#8212](https://github.com/google/ExoPlayer/issues/8212)).
    *   Support `Player.getMetadata()` and `Listener.onMediaMetadataChanged()`
        with `CastPlayer` ([#25](https://github.com/androidx/media/issues/25)).

### 1.0.0-beta01 (2022-06-16)

This release corresponds to the
[ExoPlayer 2.18.0 release](https://github.com/google/ExoPlayer/releases/tag/r2.18.0).

*   Core library:
    *   Enable support for Android platform diagnostics via
        `MediaMetricsManager`. ExoPlayer will forward playback events and
        performance data to the platform, which helps to provide system
        performance and debugging information on the device. This data may also
        be collected by Google
        [if sharing usage and diagnostics data is enabled](https://support.google.com/accounts/answer/6078260)
        by the user of the device. Apps can opt-out of contributing to platform
        diagnostics for ExoPlayer with
        `ExoPlayer.Builder.setUsePlatformDiagnostics(false)`.
    *   Fix bug that tracks are reset too often when using `MergingMediaSource`,
        for example when side-loading subtitles and changing the selected
        subtitle mid-playback
        ([#10248](https://github.com/google/ExoPlayer/issues/10248)).
    *   Stop detecting 5G-NSA network type on API 29 and 30. These playbacks
        will assume a 4G network.
    *   Disallow passing `null` to
        `MediaSource.Factory.setDrmSessionManagerProvider` and
        `MediaSource.Factory.setLoadErrorHandlingPolicy`. Instances of
        `DefaultDrmSessionManagerProvider` and `DefaultLoadErrorHandlingPolicy`
        can be passed explicitly if required.
    *   Add `MediaItem.RequestMetadata` to represent metadata needed to play
        media when the exact `LocalConfiguration` is not known. Also remove
        `MediaMetadata.mediaUrl` as this is now included in `RequestMetadata`.
    *   Add `Player.Command.COMMAND_SET_MEDIA_ITEM` to enable players to allow
        setting a single item.
*   Track selection:
    *   Flatten `TrackSelectionOverrides` class into `TrackSelectionParameters`,
        and promote `TrackSelectionOverride` to a top level class.
    *   Rename `TracksInfo` to `Tracks` and `TracksInfo.TrackGroupInfo` to
        `Tracks.Group`. `Player.getCurrentTracksInfo` and
        `Player.Listener.onTracksInfoChanged` have also been renamed to
        `Player.getCurrentTracks` and `Player.Listener.onTracksChanged`. This
        includes 'un-deprecating' the `Player.Listener.onTracksChanged` method
        name, but with different parameter types.
    *   Change `DefaultTrackSelector.buildUponParameters` and
        `DefaultTrackSelector.Parameters.buildUpon` to return
        `DefaultTrackSelector.Parameters.Builder` instead of the deprecated
        `DefaultTrackSelector.ParametersBuilder`.
    *   Add
        `DefaultTrackSelector.Parameters.constrainAudioChannelCountToDeviceCapabilities`
        which is enabled by default. When enabled, the `DefaultTrackSelector`
        will prefer audio tracks whose channel count does not exceed the device
        output capabilities. On handheld devices, the `DefaultTrackSelector`
        will prefer stereo/mono over multichannel audio formats, unless the
        multichannel format can be
        [Spatialized](https://developer.android.com/reference/android/media/Spatializer)
        (Android 12L+) or is a Dolby surround sound format. In addition, on
        devices that support audio spatialization, the `DefaultTrackSelector`
        will monitor for changes in the
        [Spatializer properties](https://developer.android.com/reference/android/media/Spatializer.OnSpatializerStateChangedListener)
        and trigger a new track selection upon these. Devices with a
        `television`
        [UI mode](https://developer.android.com/guide/topics/resources/providing-resources#UiModeQualifier)
        are excluded from these constraints and the format with the highest
        channel count will be preferred. To enable this feature, the
        `DefaultTrackSelector` instance must be constructed with a `Context`.
*   Video:
    *   Rename `DummySurface` to `PlaceholderSurface`.
    *   Add AV1 support to the `MediaCodecVideoRenderer.getCodecMaxInputSize`.
*   Audio:
    *   Use LG AC3 audio decoder advertising non-standard MIME type.
    *   Change the return type of `AudioAttributes.getAudioAttributesV21()` from
        `android.media.AudioAttributes` to a new `AudioAttributesV21` wrapper
        class, to prevent slow ART verification on API < 21.
    *   Query the platform (API 29+) or assume the audio encoding channel count
        for audio passthrough when the format audio channel count is unset,
        which occurs with HLS chunkless preparation
        ([10204](https://github.com/google/ExoPlayer/issues/10204)).
    *   Configure `AudioTrack` with channel mask
        `AudioFormat.CHANNEL_OUT_7POINT1POINT4` if the decoder outputs 12
        channel PCM audio
        ([#10322](#https://github.com/google/ExoPlayer/pull/10322).
*   DRM
    *   Ensure the DRM session is always correctly updated when seeking
        immediately after a format change
        ([10274](https://github.com/google/ExoPlayer/issues/10274)).
*   Text:
    *   Change `Player.getCurrentCues()` to return `CueGroup` instead of
        `List<Cue>`.
    *   SSA: Support `OutlineColour` style setting when `BorderStyle == 3` (i.e.
        `OutlineColour` sets the background of the cue)
        ([#8435](https://github.com/google/ExoPlayer/issues/8435)).
    *   CEA-708: Parse data into multiple service blocks and ignore blocks not
        associated with the currently selected service number.
    *   Remove `RawCcExtractor`, which was only used to handle a Google-internal
        subtitle format.
*   Extractors:
    *   Add support for AVI
        ([#2092](https://github.com/google/ExoPlayer/issues/2092)).
    *   Matroska: Parse `DiscardPadding` for Opus tracks.
    *   MP4: Parse bitrates from `esds` boxes.
    *   Ogg: Allow duplicate Opus ID and comment headers
        ([#10038](https://github.com/google/ExoPlayer/issues/10038)).
*   UI:
    *   Fix delivery of events to `OnClickListener`s set on `PlayerView`, in the
        case that `useController=false`
        ([#9605](https://github.com/google/ExoPlayer/issues/9605)). Also fix
        delivery of events to `OnLongClickListener` for all view configurations.
    *   Fix incorrectly treating a sequence of touch events that exit the bounds
        of `PlayerView` before `ACTION_UP` as a click
        ([#9861](https://github.com/google/ExoPlayer/issues/9861)).
    *   Fix `PlayerView` accessibility issue where tapping might toggle playback
        rather than hiding the controls
        ([#8627](https://github.com/google/ExoPlayer/issues/8627)).
    *   Rewrite `TrackSelectionView` and `TrackSelectionDialogBuilder` to work
        with the `Player` interface rather than `ExoPlayer`. This allows the
        views to be used with other `Player` implementations, and removes the
        dependency from the UI module to the ExoPlayer module. This is a
        breaking change.
    *   Don't show forced text tracks in the `PlayerView` track selector, and
        keep a suitable forced text track selected if "None" is selected
        ([#9432](https://github.com/google/ExoPlayer/issues/9432)).
*   DASH:
    *   Parse channel count from DTS `AudioChannelConfiguration` elements. This
        re-enables audio passthrough for DTS streams
        ([#10159](https://github.com/google/ExoPlayer/issues/10159)).
    *   Disallow passing `null` to
        `DashMediaSource.Factory.setCompositeSequenceableLoaderFactory`.
        Instances of `DefaultCompositeSequenceableLoaderFactory` can be passed
        explicitly if required.
*   HLS:
    *   Fallback to chunkful preparation if the playlist CODECS attribute does
        not contain the audio codec
        ([#10065](https://github.com/google/ExoPlayer/issues/10065)).
    *   Disallow passing `null` to
        `HlsMediaSource.Factory.setCompositeSequenceableLoaderFactory`,
        `HlsMediaSource.Factory.setPlaylistParserFactory`, and
        `HlsMediaSource.Factory.setPlaylistTrackerFactory`. Instances of
        `DefaultCompositeSequenceableLoaderFactory`,
        `DefaultHlsPlaylistParserFactory`, or a reference to
        `DefaultHlsPlaylistTracker.FACTORY` can be passed explicitly if
        required.
*   Smooth Streaming:
    *   Disallow passing `null` to
        `SsMediaSource.Factory.setCompositeSequenceableLoaderFactory`. Instances
        of `DefaultCompositeSequenceableLoaderFactory` can be passed explicitly
        if required.
*   RTSP:
    *   Add RTP reader for H263
        ([#63](https://github.com/androidx/media/pull/63)).
    *   Add RTP reader for MPEG4
        ([#35](https://github.com/androidx/media/pull/35)).
    *   Add RTP reader for HEVC
        ([#36](https://github.com/androidx/media/pull/36)).
    *   Add RTP reader for AMR. Currently only mono-channel, non-interleaved AMR
        streams are supported. Compound AMR RTP payload is not supported.
        ([#46](https://github.com/androidx/media/pull/46))
    *   Add RTP reader for VP8
        ([#47](https://github.com/androidx/media/pull/47)).
    *   Add RTP reader for WAV
        ([#56](https://github.com/androidx/media/pull/56)).
    *   Fix RTSP basic authorization header.
        ([#9544](https://github.com/google/ExoPlayer/issues/9544)).
    *   Stop checking mandatory SDP fields as ExoPlayer doesn't need them
        ([#10049](https://github.com/google/ExoPlayer/issues/10049)).
    *   Throw checked exception when parsing RTSP timing
        ([#10165](https://github.com/google/ExoPlayer/issues/10165)).
    *   Add RTP reader for VP9
        ([#47](https://github.com/androidx/media/pull/64)).
    *   Add RTP reader for OPUS
        ([#53](https://github.com/androidx/media/pull/53)).
*   Session:
    *   Replace `MediaSession.MediaItemFiller` with
        `MediaSession.Callback.onAddMediaItems` to allow asynchronous resolution
        of requests.
    *   Support `setMediaItems(s)` methods when `MediaController` connects to a
        legacy media session.
    *   Remove `MediaController.setMediaUri` and
        `MediaSession.Callback.onSetMediaUri`. The same functionality can be
        achieved by using `MediaController.setMediaItem` and
        `MediaSession.Callback.onAddMediaItems`.
    *   Forward legacy `MediaController` calls to play media to
        `MediaSession.Callback.onAddMediaItems` instead of `onSetMediaUri`.
    *   Add `MediaNotification.Provider` and `DefaultMediaNotificationProvider`
        to provide customization of the notification.
    *   Add `BitmapLoader` and `SimpleBitmapLoader` for downloading artwork
        images.
    *   Add `MediaSession.setCustomLayout()` to provide backwards compatibility
        with the legacy session.
    *   Add `MediaSession.setSessionExtras()` to provide feature parity with
        legacy session.
    *   Rename `MediaSession.MediaSessionCallback` to `MediaSession.Callback`,
        `MediaLibrarySession.MediaLibrarySessionCallback` to
        `MediaLibrarySession.Callback` and
        `MediaSession.Builder.setSessionCallback` to `setCallback`.
    *   Fix NPE in `MediaControllerImplLegacy`
        ([#59](https://github.com/androidx/media/pull/59)).
    *   Update session position info on timeline
        change([#51](https://github.com/androidx/media/issues/51)).
    *   Fix NPE in `MediaControllerImplBase` after releasing controller
        ([#74](https://github.com/androidx/media/issues/74)).
    *   Fix `IndexOutOfBoundsException` when setting less media items than in
        the current playlist
        ([#86](https://github.com/androidx/media/issues/86)).
*   Ad playback / IMA:
    *   Decrease ad polling rate from every 100ms to every 200ms, to line up
        with Media Rating Council (MRC) recommendations.
*   FFmpeg extension:
    *   Update CMake version to `3.21.0+` to avoid a CMake bug causing
        AndroidStudio's gradle sync to fail
        ([#9933](https://github.com/google/ExoPlayer/issues/9933)).
*   Remove deprecated symbols:
    *   Remove `Player.Listener.onTracksChanged(TrackGroupArray,
        TrackSelectionArray)`. Use `Player.Listener.onTracksChanged(Tracks)`
        instead.
    *   Remove `Player.getCurrentTrackGroups` and
        `Player.getCurrentTrackSelections`. Use `Player.getCurrentTracks`
        instead. You can also continue to use `ExoPlayer.getCurrentTrackGroups`
        and `ExoPlayer.getCurrentTrackSelections`, although these methods remain
        deprecated.
    *   Remove `DownloadHelper`
        `DEFAULT_TRACK_SELECTOR_PARAMETERS_WITHOUT_VIEWPORT` and
        `DEFAULT_TRACK_SELECTOR_PARAMETERS` constants. Use
        `getDefaultTrackSelectorParameters(Context)` instead when possible, and
        `DEFAULT_TRACK_SELECTOR_PARAMETERS_WITHOUT_CONTEXT` otherwise.
    *   Remove constructor `DefaultTrackSelector(ExoTrackSelection.Factory)`.
        Use `DefaultTrackSelector(Context, ExoTrackSelection.Factory)` instead.
    *   Remove `Transformer.Builder.setContext`. The `Context` should be passed
        to the `Transformer.Builder` constructor instead.

### 1.0.0-alpha03 (2022-03-14)

This release corresponds to the
[ExoPlayer 2.17.1 release](https://github.com/google/ExoPlayer/releases/tag/r2.17.1).

*   Audio:
    *   Fix error checking audio capabilities for Dolby Atmos (E-AC3-JOC) in
        HLS.
*   Extractors:
    *   FMP4: Fix issue where emsg sample metadata could be output in the wrong
        order for streams containing both v0 and v1 emsg atoms
        ([#9996](https://github.com/google/ExoPlayer/issues/9996)).
*   Text:
    *   Fix the interaction of `SingleSampleMediaSource.Factory.setTrackId` and
        `MediaItem.SubtitleConfiguration.Builder.setId` to prioritise the
        `SubtitleConfiguration` field and fall back to the `Factory` value if
        it's not set
        ([#10016](https://github.com/google/ExoPlayer/issues/10016)).
*   Ad playback:
    *   Fix audio underruns between ad periods in live HLS SSAI streams.

### 1.0.0-alpha02 (2022-03-02)

This release corresponds to the
[ExoPlayer 2.17.0 release](https://github.com/google/ExoPlayer/releases/tag/r2.17.0).

*   Core Library:
    *   Add protected method `DefaultRenderersFactory.getCodecAdapterFactory()`
        so that subclasses of `DefaultRenderersFactory` that override
        `buildVideoRenderers()` or `buildAudioRenderers()` can access the codec
        adapter factory and pass it to `MediaCodecRenderer` instances they
        create.
    *   Propagate ICY header fields `name` and `genre` to
        `MediaMetadata.station` and `MediaMetadata.genre` respectively so that
        they reach the app via `Player.Listener.onMediaMetadataChanged()`
        ([#9677](https://github.com/google/ExoPlayer/issues/9677)).
    *   Remove null keys from `DefaultHttpDataSource#getResponseHeaders`.
    *   Sleep and retry when creating a `MediaCodec` instance fails. This works
        around an issue that occurs on some devices when switching a surface
        from a secure codec to another codec
        ([#8696](https://github.com/google/ExoPlayer/issues/8696)).
    *   Add `MediaCodecAdapter.getMetrics()` to allow users obtain metrics data
        from `MediaCodec`
        ([#9766](https://github.com/google/ExoPlayer/issues/9766)).
    *   Fix Maven dependency resolution
        ([#8353](https://github.com/google/ExoPlayer/issues/8353)).
    *   Disable automatic speed adjustment for live streams that neither have
        low-latency features nor a user request setting the speed
        ([#9329](https://github.com/google/ExoPlayer/issues/9329)).
    *   Rename `DecoderCounters#inputBufferCount` to `queuedInputBufferCount`.
    *   Make `SimpleExoPlayer.renderers` private. Renderers can be accessed via
        `ExoPlayer.getRenderer`.
    *   Updated some `AnalyticsListener.EventFlags` constant values to match
        values in `Player.EventFlags`.
    *   Split `AnalyticsCollector` into an interface and default implementation
        to allow it to be stripped by R8 if an app doesn't need it.
*   Track selection:
    *   Support preferred video role flags in track selection
        ([#9402](https://github.com/google/ExoPlayer/issues/9402)).
    *   Update video track selection logic to take preferred MIME types and role
        flags into account when selecting multiple video tracks for adaptation
        ([#9519](https://github.com/google/ExoPlayer/issues/9519)).
    *   Update video and audio track selection logic to only choose formats for
        adaptive selections that have the same level of decoder and hardware
        support ([#9565](https://github.com/google/ExoPlayer/issues/9565)).
    *   Update video track selection logic to prefer more efficient codecs if
        multiple codecs are supported by primary, hardware-accelerated decoders
        ([#4835](https://github.com/google/ExoPlayer/issues/4835)).
    *   Prefer audio content preferences (for example, the "default" audio track
        or a track matching the system locale language) over technical track
        selection constraints (for example, preferred MIME type, or maximum
        channel count).
    *   Fix track selection issue where overriding one track group did not
        disable other track groups of the same type
        ([#9675](https://github.com/google/ExoPlayer/issues/9675)).
    *   Fix track selection issue where a mixture of non-empty and empty track
        overrides is not applied correctly
        ([#9649](https://github.com/google/ExoPlayer/issues/9649)).
    *   Prohibit duplicate `TrackGroup`s in a `TrackGroupArray`. `TrackGroup`s
        can always be made distinguishable by setting an `id` in the
        `TrackGroup` constructor. This fixes a crash when resuming playback
        after backgrounding the app with an active track override
        ([#9718](https://github.com/google/ExoPlayer/issues/9718)).
    *   Amend logic in `AdaptiveTrackSelection` to allow a quality increase
        under sufficient network bandwidth even if playback is very close to the
        live edge ([#9784](https://github.com/google/ExoPlayer/issues/9784)).
*   Video:
    *   Fix decoder fallback logic for Dolby Vision to use a compatible
        H264/H265 decoder if needed.
*   Audio:
    *   Fix decoder fallback logic for Dolby Atmos (E-AC3-JOC) to use a
        compatible E-AC3 decoder if needed.
    *   Change `AudioCapabilities` APIs to require passing explicitly
        `AudioCapabilities.DEFAULT_AUDIO_CAPABILITIES` instead of `null`.
    *   Allow customization of the `AudioTrack` buffer size calculation by
        injecting an `AudioTrackBufferSizeProvider` to `DefaultAudioSink`
        ([#8891](https://github.com/google/ExoPlayer/issues/8891)).
    *   Retry `AudioTrack` creation if the requested buffer size was > 1MB
        ([#9712](https://github.com/google/ExoPlayer/issues/9712)).
*   Extractors:
    *   WAV: Add support for RF64 streams
        ([#9543](https://github.com/google/ExoPlayer/issues/9543)).
    *   Fix incorrect parsing of H.265 SPS NAL units
        ([#9719](https://github.com/google/ExoPlayer/issues/9719)).
    *   Parse Vorbis Comments (including `METADATA_BLOCK_PICTURE`) in Ogg Opus
        and Ogg Vorbis files.
*   Text:
    *   Add a `MediaItem.SubtitleConfiguration.id` field which is propagated to
        the `Format.id` field of the subtitle track created from the
        configuration
        ([#9673](https://github.com/google/ExoPlayer/issues/9673)).
    *   Add basic support for WebVTT subtitles in Matroska containers
        ([#9886](https://github.com/google/ExoPlayer/issues/9886)).
    *   Prevent `Cea708Decoder` from reading more than the declared size of a
        service block.
*   DRM:
    *   Remove `playbackLooper` from `DrmSessionManager.(pre)acquireSession`.
        When a `DrmSessionManager` is used by an app in a custom `MediaSource`,
        the `playbackLooper` needs to be passed to `DrmSessionManager.setPlayer`
        instead.
*   Ad playback / IMA:
    *   Add support for
        [IMA Dynamic Ad Insertion (DAI)](https://support.google.com/admanager/answer/6147120)
        ([#8213](https://github.com/google/ExoPlayer/issues/8213)).
    *   Add a method to `AdPlaybackState` to allow resetting an ad group so that
        it can be played again
        ([#9615](https://github.com/google/ExoPlayer/issues/9615)).
    *   Enforce playback speed of 1.0 during ad playback
        ([#9018](https://github.com/google/ExoPlayer/issues/9018)).
    *   Fix issue where an ad group that failed to load caused an immediate
        playback reset
        ([#9929](https://github.com/google/ExoPlayer/issues/9929)).
*   UI:
    *   Fix the color of the numbers in `StyledPlayerView` rewind and
        fastforward buttons when using certain themes
        ([#9765](https://github.com/google/ExoPlayer/issues/9765)).
    *   Correctly translate playback speed strings
        ([#9811](https://github.com/google/ExoPlayer/issues/9811)).
*   DASH:
    *   Add parsed essential and supplemental properties to the `Representation`
        ([#9579](https://github.com/google/ExoPlayer/issues/9579)).
    *   Support the `forced-subtitle` track role
        ([#9727](https://github.com/google/ExoPlayer/issues/9727)).
    *   Stop interpreting the `main` track role as `C.SELECTION_FLAG_DEFAULT`.
    *   Fix base URL exclusion logic for manifests that do not declare the DVB
        namespace ([#9856](https://github.com/google/ExoPlayer/issues/9856)).
    *   Support relative `MPD.Location` URLs
        ([#9939](https://github.com/google/ExoPlayer/issues/9939)).
*   HLS:
    *   Correctly populate `Format.label` for audio only HLS streams
        ([#9608](https://github.com/google/ExoPlayer/issues/9608)).
    *   Use chunkless preparation by default to improve start up time. If your
        renditions contain muxed closed-caption tracks that are **not** declared
        in the master playlist, you should add them to the master playlist to be
        available for playback, or turn off chunkless preparation with
        `HlsMediaSource.Factory.setAllowChunklessPreparation(false)`.
    *   Support key-frame accurate seeking in HLS
        ([#2882](https://github.com/google/ExoPlayer/issues/2882)).
*   RTSP:
    *   Provide a client API to override the `SocketFactory` used for any server
        connection ([#9606](https://github.com/google/ExoPlayer/pull/9606)).
    *   Prefer DIGEST authentication method over BASIC if both are present
        ([#9800](https://github.com/google/ExoPlayer/issues/9800)).
    *   Handle when RTSP track timing is not available
        ([#9775](https://github.com/google/ExoPlayer/issues/9775)).
    *   Ignore invalid RTP-Info header values
        ([#9619](https://github.com/google/ExoPlayer/issues/9619)).
*   Transformer:
    *   Increase required min API version to 21.
    *   `TransformationException` is now used to describe errors that occur
        during a transformation.
    *   Add `TransformationRequest` for specifying the transformation options.
    *   Allow multiple listeners to be registered.
    *   Fix Transformer being stuck when the codec output is partially read.
    *   Fix potential NPE in `Transformer.getProgress` when releasing the muxer
        throws.
    *   Add a demo app for applying transformations.
*   MediaSession extension:
    *   By default, `MediaSessionConnector` now clears the playlist on stop.
        Apps that want the playlist to be retained can call
        `setClearMediaItemsOnStop(false)` on the connector.
*   Cast extension:
    *   Fix bug that prevented `CastPlayer` from calling `onIsPlayingChanged`
        correctly ([#9792](https://github.com/google/ExoPlayer/issues/9792)).
    *   Support audio metadata including artwork with
        `DefaultMediaItemConverter`
        ([#9663](https://github.com/google/ExoPlayer/issues/9663)).
*   FFmpeg extension:
    *   Make `build_ffmpeg.sh` depend on LLVM's bin utils instead of GNU's
        ([#9933](https://github.com/google/ExoPlayer/issues/9933)).
*   Android 12 compatibility:
    *   Upgrade the Cast extension to depend on
        `com.google.android.gms:play-services-cast-framework:20.1.0`. Earlier
        versions of `play-services-cast-framework` are not compatible with apps
        targeting Android 12, and will crash with an `IllegalArgumentException`
        when creating `PendingIntent`s
        ([#9528](https://github.com/google/ExoPlayer/issues/9528)).
*   Remove deprecated symbols:
    *   Remove `Player.EventListener`. Use `Player.Listener` instead.
    *   Remove `MediaSourceFactory.setDrmSessionManager`,
        `MediaSourceFactory.setDrmHttpDataSourceFactory`, and
        `MediaSourceFactory.setDrmUserAgent`. Use
        `MediaSourceFactory.setDrmSessionManagerProvider` instead.
    *   Remove `MediaSourceFactory.setStreamKeys`. Use
        `MediaItem.Builder.setStreamKeys` instead.
    *   Remove `MediaSourceFactory.createMediaSource(Uri)`. Use
        `MediaSourceFactory.createMediaSource(MediaItem)` instead.
    *   Remove `setTag` from `DashMediaSource`, `HlsMediaSource` and
        `SsMediaSource`. Use `MediaItem.Builder.setTag` instead.
    *   Remove `DashMediaSource.setLivePresentationDelayMs(long, boolean)`. Use
        `MediaItem.Builder.setLiveConfiguration` and
        `MediaItem.LiveConfiguration.Builder.setTargetOffsetMs` to override the
        manifest, or `DashMediaSource.setFallbackTargetLiveOffsetMs` to provide
        a fallback value.
    *   Remove `(Simple)ExoPlayer.setThrowsWhenUsingWrongThread`. Opting out of
        the thread enforcement is no longer possible.
    *   Remove `ActionFile` and `ActionFileUpgradeUtil`. Use ExoPlayer 2.16.1 or
        before to use `ActionFileUpgradeUtil` to merge legacy action files into
        `DefaultDownloadIndex`.
    *   Remove `ProgressiveMediaSource.setExtractorsFactory`. Use
        `ProgressiveMediaSource.Factory(DataSource.Factory, ExtractorsFactory)`
        constructor instead.
    *   Remove `ProgressiveMediaSource.Factory.setTag` and
        `ProgressiveMediaSource.Factory.setCustomCacheKey`. Use
        `MediaItem.Builder.setTag` and `MediaItem.Builder.setCustomCacheKey`
        instead.
    *   Remove `DefaultRenderersFactory(Context, @ExtensionRendererMode int)`
        and `DefaultRenderersFactory(Context, @ExtensionRendererMode int, long)`
        constructors. Use the `DefaultRenderersFactory(Context)` constructor,
        `DefaultRenderersFactory.setExtensionRendererMode`, and
        `DefaultRenderersFactory.setAllowedVideoJoiningTimeMs` instead.
    *   Remove all public `CronetDataSource` constructors. Use
        `CronetDataSource.Factory` instead.
*   Change the following `IntDefs` to `@Target(TYPE_USE)` only. This may break
    the compilation of usages in Kotlin, which can be fixed by moving the
    annotation to annotate the type (`Int`).
    *   `@AacAudioObjectType`
    *   `@Ac3Util.SyncFrameInfo.StreamType`
    *   `@AdLoadException.Type`
    *   `@AdtsExtractor.Flags`
    *   `@AmrExtractor.Flags`
    *   `@AspectRatioFrameLayout.ResizeMode`
    *   `@AudioFocusManager.PlayerCommand`
    *   `@AudioSink.SinkFormatSupport`
    *   `@BinarySearchSeeker.TimestampSearchResult.Type`
    *   `@BufferReplacementMode`
    *   `@C.BufferFlags`
    *   `@C.ColorRange`
    *   `@C.ColorSpace`
    *   `@C.ColorTransfer`
    *   `@C.CryptoMode`
    *   `@C.Encoding`
    *   `@C.PcmEncoding`
    *   `@C.Projection`
    *   `@C.SelectionReason`
    *   `@C.StereoMode`
    *   `@C.VideoOutputMode`
    *   `@CacheDataSource.Flags`
    *   `@CaptionStyleCompat.EdgeType`
    *   `@DataSpec.Flags`
    *   `@DataSpec.HttpMethods`
    *   `@DecoderDiscardReasons`
    *   `@DecoderReuseResult`
    *   `@DefaultAudioSink.OutputMode`
    *   `@DefaultDrmSessionManager.Mode`
    *   `@DefaultTrackSelector.SelectionEligibility`
    *   `@DefaultTsPayloadReaderFactory.Flags`
    *   `@EGLSurfaceTexture.SecureMode`
    *   `@EbmlProcessor.ElementType`
    *   `@ExoMediaDrm.KeyRequest.RequestType`
    *   `@ExtensionRendererMode`
    *   `@Extractor.ReadResult`
    *   `@FileTypes.Type`
    *   `@FlacExtractor.Flags` (in `com.google.android.exoplayer2.ext.flac`
        package)
    *   `@FlacExtractor.Flags` (in
        `com.google.android.exoplayer2.extractor.flac` package)
    *   `@FragmentedMp4Extractor.Flags`
    *   `@HlsMediaPlaylist.PlaylistType`
    *   `@HttpDataSourceException.Type`
    *   `@IllegalClippingException.Reason`
    *   `@IllegalMergeException.Reason`
    *   `@LoadErrorHandlingPolicy.FallbackType`
    *   `@MatroskaExtractor.Flags`
    *   `@Mp3Extractor.Flags`
    *   `@Mp4Extractor.Flags`
    *   `@NotificationUtil.Importance`
    *   `@PlaybackException.FieldNumber`
    *   `@PlayerNotificationManager.Priority`
    *   `@PlayerNotificationManager.Visibility`
    *   `@PlayerView.ShowBuffering`
    *   `@Renderer.State`
    *   `@RendererCapabilities.AdaptiveSupport`
    *   `@RendererCapabilities.Capabilities`
    *   `@RendererCapabilities.DecoderSupport`
    *   `@RendererCapabilities.FormatSupport`
    *   `@RendererCapabilities.HardwareAccelerationSupport`
    *   `@RendererCapabilities.TunnelingSupport`
    *   `@SampleStream.ReadDataResult`
    *   `@SampleStream.ReadFlags`
    *   `@StyledPlayerView.ShowBuffering`
    *   `@SubtitleView.ViewType`
    *   `@TextAnnotation.Position`
    *   `@TextEmphasisSpan.MarkFill`
    *   `@TextEmphasisSpan.MarkShape`
    *   `@Track.Transformation`
    *   `@TrackOutput.SampleDataPart`
    *   `@Transformer.ProgressState`
    *   `@TsExtractor.Mode`
    *   `@TsPayloadReader.Flags`
    *   `@WebvttCssStyle.FontSizeUnit`

### 1.0.0-alpha01

AndroidX Media is the new home for media support libraries, including ExoPlayer.
The first alpha contains early, functional implementations of libraries for
implementing media use cases, including:

*   ExoPlayer, an application-level media player for Android that is easy to
    customize and extend.
*   Media session functionality, for exposing and controlling playbacks. This
    new session module uses the same `Player` interface as ExoPlayer.
*   UI components for building media playback user interfaces.
*   Modules wrapping functionality in other libraries for use with ExoPlayer,
    for example, ad insertion via the IMA SDK.

ExoPlayer was previously hosted in a separate
[ExoPlayer GitHub project](https://github.com/google/ExoPlayer). In AndroidX
Media its package name is `androidx.media3.exoplayer`. We plan to continue to
maintain and release the ExoPlayer GitHub project for a while to give apps time
to migrate. AndroidX Media has replacements for all the ExoPlayer modules,
except for the legacy media2 and mediasession extensions, which are together
replaced by the new `media3-session` module. This provides direct integration
between players and media sessions without needing to use an adapter/connector
class.