DecoderVideoRenderer (ExoPlayer library)

java.lang.Object
- com.google.android.exoplayer2.BaseRenderer
- - com.google.android.exoplayer2.video.DecoderVideoRenderer

All Implemented Interfaces:

PlayerMessage.Target, Renderer, RendererCapabilities

Direct Known Subclasses:

Libgav1VideoRenderer, LibvpxVideoRenderer
```
public abstract class DecoderVideoRenderer
extends BaseRenderer
```
Decodes and renders video using a Decoder.
This renderer accepts the following messages sent via ExoPlayer.createMessage(Target) on the playback thread:
- Message with type Renderer.MSG_SET_SURFACE to set the output surface. The message payload should be the target Surface, or null.
- Message with type Renderer.MSG_SET_VIDEO_DECODER_OUTPUT_BUFFER_RENDERER to set the output buffer renderer. The message payload should be the target VideoDecoderOutputBufferRenderer, or null.
- Message with type Renderer.MSG_SET_VIDEO_FRAME_METADATA_LISTENER to set a listener for metadata associated with frames being rendered. The message payload should be the VideoFrameMetadataListener, or null.

Nested Class Summary
- Nested classes/interfaces inherited from interface com.google.android.exoplayer2.Renderer
  Renderer.State, Renderer.VideoScalingMode, Renderer.WakeupListener
- Nested classes/interfaces inherited from interface com.google.android.exoplayer2.RendererCapabilities
  RendererCapabilities.AdaptiveSupport, RendererCapabilities.Capabilities, RendererCapabilities.FormatSupport, RendererCapabilities.TunnelingSupport

Field Summary

Fields
Modifier and Type Field Description

protected DecoderCounters decoderCounters
Decoder event counters used for debugging purposes.
- Fields inherited from interface com.google.android.exoplayer2.Renderer
  MSG_CUSTOM_BASE, MSG_SET_AUDIO_ATTRIBUTES, MSG_SET_AUDIO_SESSION_ID, MSG_SET_AUX_EFFECT_INFO, MSG_SET_CAMERA_MOTION_LISTENER, MSG_SET_SCALING_MODE, MSG_SET_SKIP_SILENCE_ENABLED, MSG_SET_SURFACE, MSG_SET_VIDEO_DECODER_OUTPUT_BUFFER_RENDERER, MSG_SET_VIDEO_FRAME_METADATA_LISTENER, MSG_SET_VOLUME, MSG_SET_WAKEUP_LISTENER, STATE_DISABLED, STATE_ENABLED, STATE_STARTED, VIDEO_SCALING_MODE_DEFAULT, VIDEO_SCALING_MODE_SCALE_TO_FIT, VIDEO_SCALING_MODE_SCALE_TO_FIT_WITH_CROPPING
- Fields inherited from interface com.google.android.exoplayer2.RendererCapabilities
  ADAPTIVE_NOT_SEAMLESS, ADAPTIVE_NOT_SUPPORTED, ADAPTIVE_SEAMLESS, ADAPTIVE_SUPPORT_MASK, FORMAT_EXCEEDS_CAPABILITIES, FORMAT_HANDLED, FORMAT_SUPPORT_MASK, FORMAT_UNSUPPORTED_DRM, FORMAT_UNSUPPORTED_SUBTYPE, FORMAT_UNSUPPORTED_TYPE, TUNNELING_NOT_SUPPORTED, TUNNELING_SUPPORT_MASK, TUNNELING_SUPPORTED

Fields
Modifier and Type	Field	Description
`protected DecoderCounters`	`decoderCounters`	Decoder event counters used for debugging purposes.

Constructor Summary

Constructors
Modifier	Constructor	Description
`protected`	`DecoderVideoRenderer(long allowedJoiningTimeMs, Handler eventHandler, VideoRendererEventListener eventListener, int maxDroppedFramesToNotify)`

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`protected DecoderReuseEvaluation`	`canReuseDecoder(String decoderName, Format oldFormat, Format newFormat)`	Evaluates whether the existing decoder can be reused for a new `Format`.
`protected abstract Decoder<VideoDecoderInputBuffer,? extends VideoDecoderOutputBuffer,? extends DecoderException>`	`createDecoder(Format format, ExoMediaCrypto mediaCrypto)`	Creates a decoder for the given format.
`protected void`	`dropOutputBuffer(VideoDecoderOutputBuffer outputBuffer)`	Drops the specified output buffer and releases it.
`protected void`	`flushDecoder()`	Flushes the decoder.
`void`	`handleMessage(int messageType, Object message)`	Handles a message delivered to the target.
`boolean`	`isEnded()`	Whether the renderer is ready for the `ExoPlayer` instance to transition to `Player.STATE_ENDED`.
`boolean`	`isReady()`	Whether the renderer is able to immediately render media from the current position.
`protected boolean`	`maybeDropBuffersToKeyframe(long positionUs)`	Drops frames from the current output buffer to the next keyframe at or before the playback position.
`protected void`	`onDisabled()`	Called when the renderer is disabled.
`protected void`	`onEnabled(boolean joining, boolean mayRenderStartOfStream)`	Called when the renderer is enabled.
`protected void`	`onInputFormatChanged(FormatHolder formatHolder)`	Called when a new format is read from the upstream source.
`protected void`	`onPositionReset(long positionUs, boolean joining)`	Called when the position is reset.
`protected void`	`onProcessedOutputBuffer(long presentationTimeUs)`	Called when an output buffer is successfully processed.
`protected void`	`onQueueInputBuffer(VideoDecoderInputBuffer buffer)`	Called immediately before an input buffer is queued into the decoder.
`protected void`	`onStarted()`	Called when the renderer is started.
`protected void`	`onStopped()`	Called when the renderer is stopped.
`protected void`	`onStreamChanged(Format[] formats, long startPositionUs, long offsetUs)`	Called when the renderer's stream has changed.
`protected void`	`releaseDecoder()`	Releases the decoder.
`void`	`render(long positionUs, long elapsedRealtimeUs)`	Incrementally renders the `SampleStream`.
`protected void`	`renderOutputBuffer(VideoDecoderOutputBuffer outputBuffer, long presentationTimeUs, Format outputFormat)`	Renders the specified output buffer.
`protected abstract void`	`renderOutputBufferToSurface(VideoDecoderOutputBuffer outputBuffer, Surface surface)`	Renders the specified output buffer to the passed surface.
`protected abstract void`	`setDecoderOutputMode(int outputMode)`	Sets output mode of the decoder.
`protected void`	`setOutputBufferRenderer(VideoDecoderOutputBufferRenderer outputBufferRenderer)`	Sets output buffer renderer.
`protected void`	`setOutputSurface(Surface surface)`	Sets output surface.
`protected boolean`	`shouldDropBuffersToKeyframe(long earlyUs, long elapsedRealtimeUs)`	Returns whether to drop all buffers from the buffer being processed to the keyframe at or after the current playback position, if possible.
`protected boolean`	`shouldDropOutputBuffer(long earlyUs, long elapsedRealtimeUs)`	Returns whether the buffer being processed should be dropped.
`protected boolean`	`shouldForceRenderOutputBuffer(long earlyUs, long elapsedSinceLastRenderUs)`	Returns whether to force rendering an output buffer.
`protected void`	`skipOutputBuffer(VideoDecoderOutputBuffer outputBuffer)`	Skips the specified output buffer and releases it.
`protected void`	`updateDroppedBufferCounters(int droppedBufferCount)`	Updates decoder counters to reflect that `droppedBufferCount` additional buffers were dropped.

Methods inherited from class com.google.android.exoplayer2.BaseRenderer
createRendererException, createRendererException, disable, enable, getCapabilities, getConfiguration, getFormatHolder, getIndex, getLastResetPositionUs, getMediaClock, getReadingPositionUs, getState, getStream, getStreamFormats, getTrackType, hasReadStreamToEnd, isCurrentStreamFinal, isSourceReady, maybeThrowStreamError, onReset, readSource, replaceStream, reset, resetPosition, setCurrentStreamFinal, setIndex, skipSource, start, stop, supportsMixedMimeTypeAdaptation

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.google.android.exoplayer2.Renderer
getName, setPlaybackSpeed

Methods inherited from interface com.google.android.exoplayer2.RendererCapabilities
getName, supportsFormat

- Field Detail
  - decoderCounters
```
protected DecoderCounters decoderCounters
```
    Decoder event counters used for debugging purposes.
- Constructor Detail
  - DecoderVideoRenderer
```
protected DecoderVideoRenderer(long allowedJoiningTimeMs,
                               @Nullable
                               Handler eventHandler,
                               @Nullable
                               VideoRendererEventListener eventListener,
                               int maxDroppedFramesToNotify)
```
    Parameters:
    
    allowedJoiningTimeMs - The maximum duration in milliseconds for which this video renderer can attempt to seamlessly join an ongoing playback.
    
    eventHandler - A handler to use when delivering events to eventListener. May be null if delivery of events is not required.
    
    eventListener - A listener of events. May be null if delivery of events is not required.
    
    maxDroppedFramesToNotify - The maximum number of frames that can be dropped between invocations of VideoRendererEventListener.onDroppedFrames(int, long).
- Method Detail
  - render
```
public void render(long positionUs,
                   long elapsedRealtimeUs)
            throws ExoPlaybackException
```
    Description copied from interface: Renderer
    
    Incrementally renders the SampleStream.
    If the renderer is in the Renderer.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 Renderer.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 Renderer.STATE_ENABLED state, unless it's the initial start of the media after calling Renderer.enable(RendererConfiguration, Format[], SampleStream, long, boolean, boolean, long, long) 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: Renderer.STATE_ENABLED, Renderer.STATE_STARTED.
    
    Parameters:
    
    positionUs - The current media time in microseconds, measured at the start of the current iteration of the rendering loop.
    
    elapsedRealtimeUs - SystemClock.elapsedRealtime() in microseconds, measured at the start of the current iteration of the rendering loop.
    
    Throws:
    
    ExoPlaybackException - If an error occurs.
  - isEnded
```
public boolean isEnded()
```
    Description copied from interface: Renderer
    
    Whether the renderer is ready for the ExoPlayer instance to transition to Player.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: Renderer.STATE_ENABLED, Renderer.STATE_STARTED.
    
    Returns:
    
    Whether the renderer is ready for the player to transition to the ended state.
  - isReady
```
public boolean isReady()
```
    Description copied from interface: Renderer
    
    Whether the renderer is able to immediately render media from the current position.
    If the renderer is in the Renderer.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 Renderer.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: Renderer.STATE_ENABLED, Renderer.STATE_STARTED.
    
    Returns:
    
    Whether the renderer is ready to render media.
  - handleMessage
```
public void handleMessage(int messageType,
                          @Nullable
                          Object message)
                   throws ExoPlaybackException
```
    Description copied from interface: PlayerMessage.Target
    
    Handles a message delivered to the target.
    
    Specified by:
    
    handleMessage in interface PlayerMessage.Target
    
    Overrides:
    
    handleMessage in class BaseRenderer
    
    Parameters:
    
    messageType - The message type.
    
    message - The message payload.
    
    Throws:
    
    ExoPlaybackException - If an error occurred whilst handling the message. Should only be thrown by targets that handle messages on the playback thread.
  - onEnabled
```
protected void onEnabled(boolean joining,
                         boolean mayRenderStartOfStream)
                  throws ExoPlaybackException
```
    Description copied from class: BaseRenderer
    
    Called when the renderer is enabled.
    The default implementation is a no-op.
    
    Overrides:
    
    onEnabled in class BaseRenderer
    
    Parameters:
    
    joining - Whether this renderer is being enabled to join an ongoing playback.
    
    mayRenderStartOfStream - Whether this renderer is allowed to render the start of the stream even if the state is not Renderer.STATE_STARTED yet.
    
    Throws:
    
    ExoPlaybackException - If an error occurs.
  - onPositionReset
```
protected void onPositionReset(long positionUs,
                               boolean joining)
                        throws ExoPlaybackException
```
    Description copied from class: BaseRenderer
    
    Called when the position is reset. This occurs when the renderer is enabled after BaseRenderer.onStreamChanged(Format[], long, long) 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.
    
    Overrides:
    
    onPositionReset in class BaseRenderer
    
    Parameters:
    
    positionUs - The new playback position in microseconds.
    
    joining - Whether this renderer is being enabled to join an ongoing playback.
    
    Throws:
    
    ExoPlaybackException - If an error occurs.
  - onStarted
```
protected void onStarted()
```
    Description copied from class: BaseRenderer
    
    Called when the renderer is started.
    The default implementation is a no-op.
    
    Overrides:
    
    onStarted in class BaseRenderer
  - onStopped
```
protected void onStopped()
```
    Description copied from class: BaseRenderer
    
    Called when the renderer is stopped.
    The default implementation is a no-op.
    
    Overrides:
    
    onStopped in class BaseRenderer
  - onDisabled
```
protected void onDisabled()
```
    Description copied from class: BaseRenderer
    
    Called when the renderer is disabled.
    The default implementation is a no-op.
    
    Overrides:
    
    onDisabled in class BaseRenderer
  - onStreamChanged
```
protected void onStreamChanged(Format[] formats,
                               long startPositionUs,
                               long offsetUs)
                        throws ExoPlaybackException
```
    Description copied from class: BaseRenderer
    
    Called when the renderer's stream has changed. This occurs when the renderer is enabled after BaseRenderer.onEnabled(boolean, boolean) 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.
    
    Overrides:
    
    onStreamChanged in class BaseRenderer
    
    Parameters:
    
    formats - The enabled formats.
    
    startPositionUs - The start position of the new stream in renderer time (microseconds).
    
    offsetUs - The offset that will be added to the timestamps of buffers read via BaseRenderer.readSource(FormatHolder, DecoderInputBuffer, boolean) so that decoder input buffers have monotonically increasing timestamps.
    
    Throws:
    
    ExoPlaybackException - If an error occurs.
  - flushDecoder
```
@CallSuper
protected void flushDecoder()
                     throws ExoPlaybackException
```
    Flushes the decoder.
    
    Throws:
    
    ExoPlaybackException - If an error occurs reinitializing a decoder.
  - releaseDecoder
```
@CallSuper
protected void releaseDecoder()
```
    Releases the decoder.
  - onInputFormatChanged
```
@CallSuper
protected void onInputFormatChanged(FormatHolder formatHolder)
                             throws ExoPlaybackException
```
    Called when a new format is read from the upstream source.
    
    Parameters:
    
    formatHolder - A FormatHolder that holds the new Format.
    
    Throws:
    
    ExoPlaybackException - If an error occurs (re-)initializing the decoder.
  - onQueueInputBuffer
```
protected void onQueueInputBuffer(VideoDecoderInputBuffer buffer)
```
    Called immediately before an input buffer is queued into the decoder.
    The default implementation is a no-op.
    
    Parameters:
    
    buffer - The buffer that will be queued.
  - onProcessedOutputBuffer
```
@CallSuper
protected void onProcessedOutputBuffer(long presentationTimeUs)
```
    Called when an output buffer is successfully processed.
    
    Parameters:
    
    presentationTimeUs - The timestamp associated with the output buffer.
  - shouldDropOutputBuffer
```
protected boolean shouldDropOutputBuffer(long earlyUs,
                                         long elapsedRealtimeUs)
```
    Returns whether the buffer being processed should be dropped.
    
    Parameters:
    
    earlyUs - The time until the buffer should be presented in microseconds. A negative value indicates that the buffer is late.
    
    elapsedRealtimeUs - SystemClock.elapsedRealtime() in microseconds, measured at the start of the current iteration of the rendering loop.
  - shouldDropBuffersToKeyframe
```
protected boolean shouldDropBuffersToKeyframe(long earlyUs,
                                              long elapsedRealtimeUs)
```
    Returns whether to drop all buffers from the buffer being processed to the keyframe at or after the current playback position, if possible.
    
    Parameters:
    
    earlyUs - The time until the current buffer should be presented in microseconds. A negative value indicates that the buffer is late.
    
    elapsedRealtimeUs - SystemClock.elapsedRealtime() in microseconds, measured at the start of the current iteration of the rendering loop.
  - shouldForceRenderOutputBuffer
```
protected boolean shouldForceRenderOutputBuffer(long earlyUs,
                                                long elapsedSinceLastRenderUs)
```
    Returns whether to force rendering an output buffer.
    
    Parameters:
    
    earlyUs - The time until the current buffer should be presented in microseconds. A negative value indicates that the buffer is late.
    
    elapsedSinceLastRenderUs - The elapsed time since the last output buffer was rendered, in microseconds.
    
    Returns:
    
    Returns whether to force rendering an output buffer.
  - skipOutputBuffer
```
protected void skipOutputBuffer(VideoDecoderOutputBuffer outputBuffer)
```
    Skips the specified output buffer and releases it.
    
    Parameters:
    
    outputBuffer - The output buffer to skip.
  - dropOutputBuffer
```
protected void dropOutputBuffer(VideoDecoderOutputBuffer outputBuffer)
```
    Drops the specified output buffer and releases it.
    
    Parameters:
    
    outputBuffer - The output buffer to drop.
  - maybeDropBuffersToKeyframe
```
protected boolean maybeDropBuffersToKeyframe(long positionUs)
                                      throws ExoPlaybackException
```
    Drops frames from the current output buffer to the next keyframe at or before the playback position. If no such keyframe exists, as the playback position is inside the same group of pictures as the buffer being processed, returns false. Returns true otherwise.
    
    Parameters:
    
    positionUs - The current playback position, in microseconds.
    
    Returns:
    
    Whether any buffers were dropped.
    
    Throws:
    
    ExoPlaybackException - If an error occurs flushing the decoder.
  - updateDroppedBufferCounters
```
protected void updateDroppedBufferCounters(int droppedBufferCount)
```
    Updates decoder counters to reflect that droppedBufferCount additional buffers were dropped.
    
    Parameters:
    
    droppedBufferCount - The number of additional dropped buffers.
  - createDecoder
```
protected abstract Decoder<VideoDecoderInputBuffer,? extends VideoDecoderOutputBuffer,? extends DecoderException> createDecoder(Format format,
                                                                                                                                @Nullable
                                                                                                                                ExoMediaCrypto mediaCrypto)
                                                                                                                         throws DecoderException
```
    Creates a decoder for the given format.
    
    Parameters:
    
    format - The format for which a decoder is required.
    
    mediaCrypto - The ExoMediaCrypto object required for decoding encrypted content. May be null and can be ignored if decoder does not handle encrypted content.
    
    Returns:
    
    The decoder.
    
    Throws:
    
    DecoderException - If an error occurred creating a suitable decoder.
  - renderOutputBuffer
```
protected void renderOutputBuffer(VideoDecoderOutputBuffer outputBuffer,
                                  long presentationTimeUs,
                                  Format outputFormat)
                           throws DecoderException
```
    Renders the specified output buffer.
    The implementation of this method takes ownership of the output buffer and is responsible for calling VideoDecoderOutputBuffer.release() either immediately or in the future.
    
    Parameters:
    
    outputBuffer - VideoDecoderOutputBuffer to render.
    
    presentationTimeUs - Presentation time in microseconds.
    
    outputFormat - Output Format.
    
    Throws:
    
    DecoderException - If an error occurs when rendering the output buffer.
  - renderOutputBufferToSurface
```
protected abstract void renderOutputBufferToSurface(VideoDecoderOutputBuffer outputBuffer,
                                                    Surface surface)
                                             throws DecoderException
```
    Renders the specified output buffer to the passed surface.
    The implementation of this method takes ownership of the output buffer and is responsible for calling VideoDecoderOutputBuffer.release() either immediately or in the future.
    
    Parameters:
    
    outputBuffer - VideoDecoderOutputBuffer to render.
    
    surface - Output Surface.
    
    Throws:
    
    DecoderException - If an error occurs when rendering the output buffer.
  - setOutputSurface
```
protected final void setOutputSurface(@Nullable
                                      Surface surface)
```
    Sets output surface.
    
    Parameters:
    
    surface - Surface.
  - setOutputBufferRenderer
```
protected final void setOutputBufferRenderer(@Nullable
                                             VideoDecoderOutputBufferRenderer outputBufferRenderer)
```
    Sets output buffer renderer.
    
    Parameters:
    
    outputBufferRenderer - Output buffer renderer.
  - setDecoderOutputMode
```
protected abstract void setDecoderOutputMode(@VideoOutputMode
                                             int outputMode)
```
    Sets output mode of the decoder.
    
    Parameters:
    
    outputMode - Output mode.
  - canReuseDecoder
```
protected DecoderReuseEvaluation canReuseDecoder(String decoderName,
                                                 Format oldFormat,
                                                 Format newFormat)
```
    Evaluates whether the existing decoder can be reused for a new Format.
    The default implementation does not allow decoder reuse.
    
    Parameters:
    
    oldFormat - The previous format.
    
    newFormat - The new format.
    
    Returns:
    
    The result of the evaluation.

Class DecoderVideoRenderer

Nested Class Summary

Nested classes/interfaces inherited from interface com.google.android.exoplayer2.Renderer

Nested classes/interfaces inherited from interface com.google.android.exoplayer2.RendererCapabilities

Field Summary

Fields inherited from interface com.google.android.exoplayer2.Renderer

Fields inherited from interface com.google.android.exoplayer2.RendererCapabilities

Constructor Summary

Method Summary

Methods inherited from class com.google.android.exoplayer2.BaseRenderer

Methods inherited from class java.lang.Object

Methods inherited from interface com.google.android.exoplayer2.Renderer

Methods inherited from interface com.google.android.exoplayer2.RendererCapabilities

Field Detail

decoderCounters

Constructor Detail

DecoderVideoRenderer

Method Detail

render

isEnded

isReady

handleMessage

onEnabled

onPositionReset

onStarted

onStopped

onDisabled

onStreamChanged

flushDecoder

releaseDecoder

onInputFormatChanged

onQueueInputBuffer

onProcessedOutputBuffer

shouldDropOutputBuffer

shouldDropBuffersToKeyframe

shouldForceRenderOutputBuffer

skipOutputBuffer

dropOutputBuffer

maybeDropBuffersToKeyframe

updateDroppedBufferCounters

createDecoder

renderOutputBuffer

renderOutputBufferToSurface

setOutputSurface

setOutputBufferRenderer

setDecoderOutputMode

canReuseDecoder