HlsPlaylistTracker
@UnstableApi
public interface HlsPlaylistTracker
DefaultHlsPlaylistTracker |
Default implementation for |
Tracks playlists associated to an HLS stream and provides snapshots.
The playlist tracker is responsible for exposing the seeking window, which is defined by the segments that one of the playlists exposes. This playlist is called primary and needs to be periodically refreshed in the case of live streams. Note that the primary playlist is one of the media playlists while the multivariant playlist is an optional kind of playlist defined by the HLS specification (RFC 8216).
Playlist loads might encounter errors. The tracker may choose to exclude them to ensure a primary playlist is always available.
Summary
Nested types |
|---|
public interface HlsPlaylistTracker.FactoryFactory for |
public interface HlsPlaylistTracker.PlaylistEventListenerCalled on playlist loading events. |
public final class HlsPlaylistTracker.PlaylistResetException extends IOExceptionThrown when the media sequence of a new snapshot indicates the server has reset. |
public final class HlsPlaylistTracker.PlaylistStuckException extends IOExceptionThrown when a playlist is considered to be stuck due to a server side error. |
public interface HlsPlaylistTracker.PrimaryPlaylistListenerListener for primary playlist changes. |
Public methods |
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abstract void |
Registers a listener to receive events from the playlist tracker. |
abstract boolean |
excludeMediaPlaylist(Uri playlistUrl, long exclusionDurationMs)Excludes the given media playlist for the given duration, in milliseconds. |
abstract long |
Returns the start time of the first loaded primary playlist, or |
abstract @Nullable HlsMultivariantPlaylist |
Returns the multivariant playlist. |
abstract @Nullable HlsMediaPlaylist |
getPlaylistSnapshot(Uri url, boolean isForPlayback)Returns the most recent snapshot available of the playlist referenced by the provided . |
abstract boolean |
isLive()Returns whether the tracked playlists describe a live stream. |
abstract boolean |
isSnapshotValid(Uri url)Returns whether the snapshot of the playlist referenced by the provided |
abstract void |
If the playlist is having trouble refreshing the playlist referenced by the given |
abstract void |
If the tracker is having trouble refreshing the multivariant playlist or the primary playlist, this method throws the underlying error. |
abstract void |
refreshPlaylist(Uri url)Requests a playlist refresh and removes it from the exclusion list. |
abstract void |
Unregisters a listener. |
abstract void |
start(Starts the playlist tracker. |
abstract void |
stop()Stops the playlist tracker and releases any acquired resources. |
Public methods
addListener
abstract void addListener(HlsPlaylistTracker.PlaylistEventListener listener)
Registers a listener to receive events from the playlist tracker.
| Parameters | |
|---|---|
HlsPlaylistTracker.PlaylistEventListener listener |
The listener. |
excludeMediaPlaylist
abstract boolean excludeMediaPlaylist(Uri playlistUrl, long exclusionDurationMs)
Excludes the given media playlist for the given duration, in milliseconds.
| Parameters | |
|---|---|
Uri playlistUrl |
The URL of the media playlist. |
long exclusionDurationMs |
The duration for which to exclude the playlist. |
| Returns | |
|---|---|
boolean |
Whether exclusion was successful. |
getInitialStartTimeUs
abstract long getInitialStartTimeUs()
Returns the start time of the first loaded primary playlist, or TIME_UNSET if no media playlist has been loaded.
getMultivariantPlaylist
abstract @Nullable HlsMultivariantPlaylist getMultivariantPlaylist()
Returns the multivariant playlist.
If the uri passed to start points to a media playlist, an with a single variant for said media playlist is returned.
| Returns | |
|---|---|
@Nullable HlsMultivariantPlaylist |
The multivariant playlist. Null if the initial playlist has yet to be loaded. |
getPlaylistSnapshot
abstract @Nullable HlsMediaPlaylist getPlaylistSnapshot(Uri url, boolean isForPlayback)
Returns the most recent snapshot available of the playlist referenced by the provided .
| Parameters | |
|---|---|
Uri url |
The |
boolean isForPlayback |
Whether the caller might use the snapshot to request media segments for playback. If true, the primary playlist may be updated to the one requested. |
| Returns | |
|---|---|
@Nullable HlsMediaPlaylist |
The most recent snapshot of the playlist referenced by the provided |
isLive
abstract boolean isLive()
Returns whether the tracked playlists describe a live stream.
| Returns | |
|---|---|
boolean |
True if the content is live. False otherwise. |
isSnapshotValid
abstract boolean isSnapshotValid(Uri url)
Returns whether the snapshot of the playlist referenced by the provided Uri is valid, meaning all the segments referenced by the playlist are expected to be available. If the playlist is not valid then some of the segments may no longer be available.
| Returns | |
|---|---|
boolean |
Whether the snapshot of the playlist referenced by the provided |
maybeThrowPlaylistRefreshError
abstract void maybeThrowPlaylistRefreshError(Uri url)
If the playlist is having trouble refreshing the playlist referenced by the given Uri, this method throws the underlying error.
| Throws | |
|---|---|
java.io.IOException |
The underyling error. |
maybeThrowPrimaryPlaylistRefreshError
abstract void maybeThrowPrimaryPlaylistRefreshError()
If the tracker is having trouble refreshing the multivariant playlist or the primary playlist, this method throws the underlying error. Otherwise, does nothing.
| Throws | |
|---|---|
java.io.IOException |
The underlying error. |
refreshPlaylist
abstract void refreshPlaylist(Uri url)
Requests a playlist refresh and removes it from the exclusion list.
The playlist tracker may choose to delay the playlist refresh. The request is discarded if a refresh was already pending.
removeListener
abstract void removeListener(HlsPlaylistTracker.PlaylistEventListener listener)
Unregisters a listener.
| Parameters | |
|---|---|
HlsPlaylistTracker.PlaylistEventListener listener |
The listener to unregister. |
start
abstract void start(
Uri initialPlaylistUri,
MediaSourceEventListener.EventDispatcher eventDispatcher,
HlsPlaylistTracker.PrimaryPlaylistListener primaryPlaylistListener
)
Starts the playlist tracker.
Must be called from the playback thread. A tracker may be restarted after a stop call.
| Parameters | |
|---|---|
Uri initialPlaylistUri |
Uri of the HLS stream. Can point to a media playlist or a multivariant playlist. |
MediaSourceEventListener.EventDispatcher eventDispatcher |
A dispatcher to notify of events. |
HlsPlaylistTracker.PrimaryPlaylistListener primaryPlaylistListener |
A callback for the primary playlist change events. |