MetadataRenderer

Artifact: androidx.media3:media3-exoplayer

Kotlin |Java

@UnstableApi
class MetadataRenderer : BaseRenderer, Handler.Callback

kotlin.Any
↳	androidx.media3.exoplayer.BaseRenderer
	↳	androidx.media3.exoplayer.metadata.MetadataRenderer

A renderer for metadata.

The renderer can be configured to render metadata as soon as they are available using MetadataRenderer.

Summary

Public constructors
`MetadataRenderer(output: MetadataOutput!, outputLooper: Looper?)` Creates an instance that uses `DEFAULT` to create instances.
`MetadataRenderer( output: MetadataOutput!, outputLooper: Looper?, decoderFactory: MetadataDecoderFactory! )` Creates an instance.
`MetadataRenderer( output: MetadataOutput!, outputLooper: Looper?, decoderFactory: MetadataDecoderFactory!, outputMetadataEarly: Boolean )` Creates an instance.

Public functions
`String!`	`getName()` Returns the name of this renderer, for logging and debugging purposes.
`Boolean`	`handleMessage(msg: Message!)`
`Boolean`	`isEnded()` Whether the renderer is ready for the `ExoPlayer` instance to transition to `STATE_ENDED`.
`Boolean`	`isReady()` Whether the renderer is able to immediately render media from the current position.
`Unit`	`render(positionUs: Long, elapsedRealtimeUs: Long)` Incrementally renders the `SampleStream`.
`Int`	`@RendererCapabilities.Capabilities supportsFormat(format: Format!)` Returns the extent to which the `Renderer` supports a given format.

Protected functions
`Unit`	`onDisabled()` Called when the renderer is disabled.
`Unit`	`onPositionReset(positionUs: Long, joining: Boolean)` Called when the position is reset.
`Unit`	`onStreamChanged( formats: Array<Format!>!, startPositionUs: Long, offsetUs: Long, mediaPeriodId: MediaSource.MediaPeriodId! )` Called when the renderer's stream has changed.

Inherited Constants

From androidx.media3.exoplayer.Renderer

`const Int`	`MSG_CUSTOM_BASE = 10000` Applications or extensions may define custom `MSG_*` constants that can be passed to renderers.
`const Int`	`MSG_SET_AUDIO_ATTRIBUTES = 3` A type of a message that can be passed to an audio renderer via `createMessage`.
`const Int`	`MSG_SET_AUDIO_SESSION_ID = 10` The type of a message that can be passed to audio and video renderers via `createMessage`.
`const Int`	`MSG_SET_AUX_EFFECT_INFO = 6` A type of a message that can be passed to an audio renderer via `createMessage`.
`const Int`	`MSG_SET_CAMERA_MOTION_LISTENER = 8` The type of a message that can be passed to a camera motion renderer via `createMessage`.
`const Int`	`MSG_SET_CHANGE_FRAME_RATE_STRATEGY = 5` The type of a message that can be passed to a video renderer via `createMessage`.
`const Int`	`MSG_SET_IMAGE_OUTPUT = 15` The type of message that can be passed to an image renderer to set a desired image output.
`const Int`	`MSG_SET_PREFERRED_AUDIO_DEVICE = 12` The type of a message that can be passed to audio renderers via `createMessage`.
`const Int`	`MSG_SET_SCALING_MODE = 4` The type of a message that can be passed to a `MediaCodec`-based video renderer via `createMessage`.
`const Int`	`MSG_SET_SKIP_SILENCE_ENABLED = 9` The type of a message that can be passed to an audio renderer via `createMessage`.
`const Int`	`MSG_SET_VIDEO_EFFECTS = 13` The type of a message that can be passed to a video renderer.
`const Int`	`MSG_SET_VIDEO_FRAME_METADATA_LISTENER = 7` The type of a message that can be passed to a video renderer via `createMessage`.
`const Int`	`MSG_SET_VIDEO_OUTPUT = 1` The type of a message that can be passed to a video renderer via `createMessage`.
`const Int`	`MSG_SET_VIDEO_OUTPUT_RESOLUTION = 14` The type of a message that can be passed to a video renderer to set the desired output resolution.
`const Int`	`MSG_SET_VOLUME = 2` A type of a message that can be passed to an audio renderer via `createMessage`.
`const Int`	`MSG_SET_WAKEUP_LISTENER = 11` The type of a message that can be passed to a `Renderer` via `createMessage`, to inform the renderer that it can schedule waking up another component.
`const Int`	`STATE_DISABLED = 0` The renderer is disabled.
`const Int`	`STATE_ENABLED = 1` The renderer is enabled but not started.
`const Int`	`STATE_STARTED = 2` The renderer is started.

From androidx.media3.exoplayer.RendererCapabilities

`const Int`	`ADAPTIVE_NOT_SEAMLESS = 8` The `Renderer` can adapt between formats, but may suffer a brief discontinuity (~50-100ms) when adaptation occurs.
`const Int`	`ADAPTIVE_NOT_SUPPORTED = 0` The `Renderer` does not support adaptation between formats.
`const Int`	`ADAPTIVE_SEAMLESS = 16` The `Renderer` can seamlessly adapt between formats.
`const Int`	`ADAPTIVE_SUPPORT_MASK = 24` A mask to apply to `Capabilities` to obtain the `AdaptiveSupport` only.
`const Int`	`AUDIO_OFFLOAD_GAPLESS_SUPPORTED = 1024` The renderer supports audio offload and gapless transitions with this format.
`const Int`	`AUDIO_OFFLOAD_NOT_SUPPORTED = 0` Audio offload is not supported with this format.
`const Int`	`AUDIO_OFFLOAD_SPEED_CHANGE_SUPPORTED = 2048` The renderer supports audio offload and speed changes with this format.
`const Int`	`AUDIO_OFFLOAD_SUPPORTED = 512` The renderer supports audio offload with this format.
`const Int`	`AUDIO_OFFLOAD_SUPPORT_MASK = 3584` A mask to apply to `Capabilities` to obtain `AudioOffloadSupport` only.
`const Int`	`DECODER_SUPPORT_FALLBACK = 0` The format exceeds the primary decoder's capabilities but is supported by fallback decoder
`const Int`	`DECODER_SUPPORT_FALLBACK_MIMETYPE = 256` The format's MIME type is unsupported and the renderer may use a decoder for a fallback MIME type.
`const Int`	`DECODER_SUPPORT_MASK = 384` A mask to apply to `Capabilities` to obtain `DecoderSupport` only.
`const Int`	`DECODER_SUPPORT_PRIMARY = 128` The renderer is able to use the primary decoder for the format's MIME type.
`const Int`	`FORMAT_EXCEEDS_CAPABILITIES = 3` This property is deprecated. Use `FORMAT_EXCEEDS_CAPABILITIES` instead.
`const Int`	`FORMAT_HANDLED = 4` This property is deprecated. Use `FORMAT_HANDLED` instead.
`const Int`	`FORMAT_SUPPORT_MASK = 7` A mask to apply to `Capabilities` to obtain the `C.FormatSupport` only.
`const Int`	`FORMAT_UNSUPPORTED_DRM = 2` This property is deprecated. Use `FORMAT_UNSUPPORTED_DRM` instead.
`const Int`	`FORMAT_UNSUPPORTED_SUBTYPE = 1` This property is deprecated. Use `FORMAT_UNSUPPORTED_SUBTYPE` instead.
`const Int`	`FORMAT_UNSUPPORTED_TYPE = 0` This property is deprecated. Use `FORMAT_UNSUPPORTED_TYPE` instead.
`const Int`	`HARDWARE_ACCELERATION_NOT_SUPPORTED = 0` The renderer is not able to use hardware acceleration.
`const Int`	`HARDWARE_ACCELERATION_SUPPORTED = 64` The renderer is able to use hardware acceleration.
`const Int`	`HARDWARE_ACCELERATION_SUPPORT_MASK = 64` A mask to apply to `Capabilities` to obtain `HardwareAccelerationSupport` only.
`const Int`	`TUNNELING_NOT_SUPPORTED = 0` The `Renderer` does not support tunneled output.
`const Int`	`TUNNELING_SUPPORTED = 32` The `Renderer` supports tunneled output.
`const Int`	`TUNNELING_SUPPORT_MASK = 32` A mask to apply to `Capabilities` to obtain `TunnelingSupport` only.

Inherited functions

From androidx.media3.exoplayer.BaseRenderer

`Unit`	`clearListener()` Clears the `Listener`.
`ExoPlaybackException!`	`createRendererException( cause: Throwable!, format: Format?, @PlaybackException.ErrorCode errorCode: Int )` Creates an `ExoPlaybackException` of type `TYPE_RENDERER` for this renderer.
`ExoPlaybackException!`	`createRendererException( cause: Throwable!, format: Format?, isRecoverable: Boolean, @PlaybackException.ErrorCode errorCode: Int )` Creates an `ExoPlaybackException` of type `TYPE_RENDERER` for this renderer.
`Unit`	`disable()` Disable the renderer, transitioning it to the `STATE_DISABLED` state.
`Unit`	`enable( configuration: RendererConfiguration!, formats: Array<Format!>!, stream: SampleStream!, positionUs: Long, joining: Boolean, mayRenderStartOfStream: Boolean, startPositionUs: Long, offsetUs: Long, mediaPeriodId: MediaSource.MediaPeriodId! )` Enables the renderer to consume from the specified `SampleStream`.
`RendererCapabilities!`	`getCapabilities()` Returns the capabilities of the renderer.
`MediaClock?`	`getMediaClock()` If the renderer advances its own playback position then this method returns a corresponding `MediaClock`.
`Unit`	`handleMessage(@Renderer.MessageType messageType: Int, message: Any?)` Handles a message delivered to the target.
`Boolean`	`hasReadStreamToEnd()` Returns whether the renderer has read the current `SampleStream` to the end.
`Unit`	`init(index: Int, playerId: PlayerId!, clock: Clock!)` Initializes the renderer for playback with a player.
`Boolean`	`isCurrentStreamFinal()` Returns whether the current `SampleStream` will be the final one supplied before the renderer is next disabled or reset.
`Boolean`	`isSourceReady()` Returns whether the upstream source is ready.
`Unit`	`maybeThrowStreamError()` Throws an error that's preventing the renderer from reading from its `SampleStream`.
`Unit`	`onEnabled(joining: Boolean, mayRenderStartOfStream: Boolean)` Called when the renderer is enabled.
`Unit`	`onInit()` Called when the renderer is initialized.
`Unit`	`onRelease()` Called when the renderer is released.
`Unit`	`onRendererCapabilitiesChanged()` Called when the renderer capabilities are changed.
`Unit`	`onReset()` Called when the renderer is reset.
`Unit`	`onStarted()` Called when the renderer is started.
`Unit`	`onStopped()` Called when the renderer is stopped.
`Unit`	`onTimelineChanged(timeline: Timeline!)` Called when a new timeline is `set`.
`Int`	`@SampleStream.ReadDataResult readSource( formatHolder: FormatHolder!, buffer: DecoderInputBuffer!, @SampleStream.ReadFlags readFlags: Int )` Reads from the enabled upstream source.
`Unit`	`release()` Releases the renderer.
`Unit`	`replaceStream( formats: Array<Format!>!, stream: SampleStream!, startPositionUs: Long, offsetUs: Long, mediaPeriodId: MediaSource.MediaPeriodId! )` Replaces the `SampleStream` from which samples will be consumed.
`Unit`	`reset()` Forces the renderer to give up any resources (e.g. media decoders) that it may be holding.
`Unit`	`resetPosition(positionUs: Long)` Signals to the renderer that a position discontinuity has occurred.
`Unit`	`setCurrentStreamFinal()` Signals to the renderer that the current `SampleStream` will be the final one supplied before it is next disabled or reset.
`Unit`	`setListener(listener: RendererCapabilities.Listener!)` Sets the `Listener`.
`Int`	`skipSource(positionUs: Long)` Attempts to skip to the keyframe before the specified position, or to the end of the stream if `positionUs` is beyond it.
`Unit`	`start()` Starts the renderer, meaning that calls to `render` will cause media to be rendered.
`Unit`	`stop()` Stops the renderer, transitioning it to the `STATE_ENABLED` state.
`Int`	`@RendererCapabilities.AdaptiveSupport supportsMixedMimeTypeAdaptation()` Returns the extent to which the `Renderer` supports adapting between supported formats that have different MIME types.

From androidx.media3.exoplayer.Renderer

`abstract Unit`	`enable( configuration: RendererConfiguration!, formats: Array<Format!>!, stream: SampleStream!, positionUs: Long, joining: Boolean, mayRenderStartOfStream: Boolean, startPositionUs: Long, offsetUs: Long, mediaPeriodId: MediaSource.MediaPeriodId! )` Enables the renderer to consume from the specified `SampleStream`.
`Unit`	`enableMayRenderStartOfStream()` Enables this renderer to render the start of the stream even if the state is not `STATE_STARTED` yet.
`abstract Unit`	`replaceStream( formats: Array<Format!>!, stream: SampleStream!, startPositionUs: Long, offsetUs: Long, mediaPeriodId: MediaSource.MediaPeriodId! )` Replaces the `SampleStream` from which samples will be consumed.
`Unit`	`setPlaybackSpeed(currentPlaybackSpeed: Float, targetPlaybackSpeed: Float)` Indicates the playback speed to this renderer.

From androidx.media3.exoplayer.RendererCapabilities

`java-static Int`	`@RendererCapabilities.Capabilities create(@C.FormatSupport formatSupport: Int)` Returns `Capabilities` for the given `C.FormatSupport`.
`java-static Int`	`@RendererCapabilities.Capabilities create( @C.FormatSupport formatSupport: Int, @RendererCapabilities.AdaptiveSupport adaptiveSupport: Int, @RendererCapabilities.TunnelingSupport tunnelingSupport: Int )` Returns `Capabilities` combining the given `C.FormatSupport`, and `TunnelingSupport`.
`java-static Int`	`@RendererCapabilities.Capabilities create( @C.FormatSupport formatSupport: Int, @RendererCapabilities.AdaptiveSupport adaptiveSupport: Int, @RendererCapabilities.TunnelingSupport tunnelingSupport: Int, @RendererCapabilities.AudioOffloadSupport audioOffloadSupport: Int )` Returns `Capabilities` combining the given `C.FormatSupport`, , `TunnelingSupport`, and `AudioOffloadSupport`.
`java-static Int`	`@RendererCapabilities.Capabilities create( @C.FormatSupport formatSupport: Int, @RendererCapabilities.AdaptiveSupport adaptiveSupport: Int, @RendererCapabilities.TunnelingSupport tunnelingSupport: Int, @RendererCapabilities.HardwareAccelerationSupport hardwareAccelerationSupport: Int, @RendererCapabilities.DecoderSupport decoderSupport: Int )` Returns `Capabilities` combining the given `C.FormatSupport`, , `TunnelingSupport`, `HardwareAccelerationSupport`, and .
`java-static Int`	`@RendererCapabilities.Capabilities create( @C.FormatSupport formatSupport: Int, @RendererCapabilities.AdaptiveSupport adaptiveSupport: Int, @RendererCapabilities.TunnelingSupport tunnelingSupport: Int, @RendererCapabilities.HardwareAccelerationSupport hardwareAccelerationSupport: Int, @RendererCapabilities.DecoderSupport decoderSupport: Int, @RendererCapabilities.AudioOffloadSupport audioOffloadSupport: Int )` Returns `Capabilities` combining the given `C.FormatSupport`, , `TunnelingSupport`, `HardwareAccelerationSupport`, and `AudioOffloadSupport`.
`java-static Int`	`@RendererCapabilities.AdaptiveSupport getAdaptiveSupport(@RendererCapabilities.Capabilities supportFlags: Int)` Returns the `AdaptiveSupport` from the combined `Capabilities`.
`java-static Int`	`@RendererCapabilities.AudioOffloadSupport getAudioOffloadSupport( @RendererCapabilities.Capabilities supportFlags: Int )` Returns the `AudioOffloadSupport` from the combined `Capabilities`.
`java-static Int`	`@RendererCapabilities.DecoderSupport getDecoderSupport(@RendererCapabilities.Capabilities supportFlags: Int)` Returns the `DecoderSupport` from the combined `Capabilities`.
`java-static Int`	`@C.FormatSupport getFormatSupport(@RendererCapabilities.Capabilities supportFlags: Int)` Returns the `C.FormatSupport` from the combined `Capabilities`.
`java-static Int`	`@RendererCapabilities.HardwareAccelerationSupport getHardwareAccelerationSupport( @RendererCapabilities.Capabilities supportFlags: Int )` Returns the `HardwareAccelerationSupport` from the combined `Capabilities`.
`java-static Int`	`@RendererCapabilities.TunnelingSupport getTunnelingSupport(@RendererCapabilities.Capabilities supportFlags: Int)` Returns the `TunnelingSupport` from the combined `Capabilities`.
`Unit`	`setListener(listener: RendererCapabilities.Listener!)` Sets the `Listener`.

Inherited properties

From androidx.media3.exoplayer.BaseRenderer

`@MonotonicNonNull Clock!`	`@MonotonicNonNull clock`
`RendererConfiguration?`	`configuration`
`FormatHolder!`	`formatHolder`
`Int`	`index`
`Long`	`lastResetPositionUs`
`@MonotonicNonNull PlayerId!`	`@MonotonicNonNull playerId`
`Long`	`readingPositionUs`
`Int`	`state`
`SampleStream?`	`stream`
`Array<Format!>?`	`streamFormats`
`Timeline!`	`timeline`
`Int`	`@C.TrackType trackType`

Public constructors

MetadataRenderer

MetadataRenderer(output: MetadataOutput!, outputLooper: Looper?)

Creates an instance that uses DEFAULT to create instances.

Parameters
`output: MetadataOutput!`	The output.
`outputLooper: Looper?`	The looper associated with the thread on which the output should be called. If the output makes use of standard Android UI components, then this should normally be the looper associated with the application's main thread, which can be obtained using `getMainLooper`. Null may be passed if the output should be called directly on the player's internal rendering thread.

MetadataRenderer

MetadataRenderer(
    output: MetadataOutput!,
    outputLooper: Looper?,
    decoderFactory: MetadataDecoderFactory!
)

Creates an instance.

Parameters
`output: MetadataOutput!`	The output.
`outputLooper: Looper?`	The looper associated with the thread on which the output should be called. If the output makes use of standard Android UI components, then this should normally be the looper associated with the application's main thread, which can be obtained using `getMainLooper`. Null may be passed if the output should be called directly on the player's internal rendering thread.
`decoderFactory: MetadataDecoderFactory!`	A factory from which to obtain `MetadataDecoder` instances.

MetadataRenderer

MetadataRenderer(
    output: MetadataOutput!,
    outputLooper: Looper?,
    decoderFactory: MetadataDecoderFactory!,
    outputMetadataEarly: Boolean
)

Creates an instance.

Parameters
`output: MetadataOutput!`	The output.
`outputLooper: Looper?`	The looper associated with the thread on which the output should be called. If the output makes use of standard Android UI components, then this should normally be the looper associated with the application's main thread, which can be obtained using `getMainLooper`. Null may be passed if the output should be called directly on the player's internal rendering thread.
`decoderFactory: MetadataDecoderFactory!`	A factory from which to obtain `MetadataDecoder` instances.
`outputMetadataEarly: Boolean`	Whether the renderer outputs metadata early. When `true`, `render` will output metadata as soon as they are available to the renderer, otherwise `render` will output metadata in sync with the rendering position.

Public functions

getName

fun getName(): String!

Returns the name of this renderer, for logging and debugging purposes. Should typically be the renderer's (un-obfuscated) class name.

Returns
`String!`	The name of this renderer.

handleMessage

fun handleMessage(msg: Message!): Boolean

isEnded

fun isEnded(): Boolean

Whether the renderer is ready for the ExoPlayer instance to transition to STATE_ENDED. The player will make this transition as soon as true is returned by all of its renderers.

This method may be called when the renderer is in the following states: STATE_ENABLED, STATE_STARTED.

Returns
`Boolean`	Whether the renderer is ready for the player to transition to the ended state.

isReady

fun isReady(): Boolean

Whether the renderer is able to immediately render media from the current position.

If the renderer is in the STATE_STARTED state then returning true indicates that the renderer has everything that it needs to continue playback. Returning false indicates that the player should pause until the renderer is ready.

If the renderer is in the STATE_ENABLED state then returning true indicates that the renderer is ready for playback to be started. Returning false indicates that it is not.

This method may be called when the renderer is in the following states: STATE_ENABLED, STATE_STARTED.

Returns
`Boolean`	Whether the renderer is ready to render media.

render

fun render(positionUs: Long, elapsedRealtimeUs: Long): Unit

Incrementally renders the SampleStream.

If the renderer is in the STATE_ENABLED state then each call to this method will do work toward being ready to render the SampleStream when the renderer is started. If the renderer is in the STATE_STARTED state then calls to this method will render the SampleStream in sync with the specified media positions.

The renderer may also render the very start of the media at the current position (e.g. the first frame of a video stream) while still in the STATE_ENABLED state, unless it's the initial start of the media after calling enable with mayRenderStartOfStream set to false.

This method should return quickly, and should not block if the renderer is unable to make useful progress.

This method may be called when the renderer is in the following states: STATE_ENABLED, STATE_STARTED.

Parameters
`positionUs: Long`	The current media time in microseconds, measured at the start of the current iteration of the rendering loop.
`elapsedRealtimeUs: Long`	`elapsedRealtime` in microseconds, measured at the start of the current iteration of the rendering loop.

Throws
`androidx.media3.exoplayer.ExoPlaybackException`	If an error occurs.

supportsFormat

@RendererCapabilities.Capabilities
fun supportsFormat(format: Format!): Int

Returns the extent to which the Renderer supports a given format.

Parameters
`format: Format!`	The format.

Returns
`Int`	The `Capabilities` for this format.

Throws
`androidx.media3.exoplayer.ExoPlaybackException`	If an error occurs.

Protected functions

onDisabled

protected fun onDisabled(): Unit

Called when the renderer is disabled.

The default implementation is a no-op.

onPositionReset

protected fun onPositionReset(positionUs: Long, joining: Boolean): Unit

Called when the position is reset. This occurs when the renderer is enabled after onStreamChanged has been called, and also when a position discontinuity is encountered.

After a position reset, the renderer's SampleStream is guaranteed to provide samples starting from a key frame.

The default implementation is a no-op.

Parameters
`positionUs: Long`	The new playback position in microseconds.
`joining: Boolean`	Whether this renderer is being enabled to join an ongoing playback.

Throws
`androidx.media3.exoplayer.ExoPlaybackException`	If an error occurs.

onStreamChanged

protected fun onStreamChanged(
    formats: Array<Format!>!,
    startPositionUs: Long,
    offsetUs: Long,
    mediaPeriodId: MediaSource.MediaPeriodId!
): Unit

Called when the renderer's stream has changed. This occurs when the renderer is enabled after onEnabled has been called, and also when the stream has been replaced whilst the renderer is enabled or started.

The default implementation is a no-op.

Parameters
`formats: Array<Format!>!`	The enabled formats.
`startPositionUs: Long`	The start position of the new stream in renderer time (microseconds).
`offsetUs: Long`	The offset that will be added to the timestamps of buffers read via `readSource` so that decoder input buffers have monotonically increasing timestamps.
`mediaPeriodId: MediaSource.MediaPeriodId!`	The `MediaSource.MediaPeriodId` of the `MediaPeriod` that produces the stream.

Throws
`androidx.media3.exoplayer.ExoPlaybackException`	If an error occurs.