/
Renderer.java
506 lines (475 loc) · 20.5 KB
/
Renderer.java
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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.media3.exoplayer;
import static java.lang.annotation.ElementType.TYPE_USE;
import android.media.MediaCodec;
import android.view.Surface;
import androidx.annotation.IntDef;
import androidx.annotation.Nullable;
import androidx.media3.common.AudioAttributes;
import androidx.media3.common.AuxEffectInfo;
import androidx.media3.common.C;
import androidx.media3.common.Format;
import androidx.media3.common.Player;
import androidx.media3.common.util.UnstableApi;
import androidx.media3.common.util.Util;
import androidx.media3.exoplayer.analytics.PlayerId;
import androidx.media3.exoplayer.source.SampleStream;
import androidx.media3.exoplayer.video.VideoDecoderOutputBufferRenderer;
import androidx.media3.exoplayer.video.VideoFrameMetadataListener;
import androidx.media3.exoplayer.video.spherical.CameraMotionListener;
import java.io.IOException;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* Renders media read from a {@link SampleStream}.
*
* <p>Internally, a renderer's lifecycle is managed by the owning {@link ExoPlayer}. The renderer is
* transitioned through various states as the overall playback state and enabled tracks change. The
* valid state transitions are shown below, annotated with the methods that are called during each
* transition.
*
* <p style="align:center"><img src="doc-files/renderer-states.svg" alt="Renderer state
* transitions">
*/
@UnstableApi
public interface Renderer extends PlayerMessage.Target {
/**
* Some renderers can signal when {@link #render(long, long)} should be called.
*
* <p>That allows the player to sleep until the next wakeup, instead of calling {@link
* #render(long, long)} in a tight loop. The aim of this interrupt based scheduling is to save
* power.
*/
interface WakeupListener {
/**
* The renderer no longer needs to render until the next wakeup.
*
* <p>Must be called from the thread ExoPlayer invokes the renderer from.
*/
void onSleep();
/**
* The renderer needs to render some frames. The client should call {@link #render(long, long)}
* at its earliest convenience.
*
* <p>Can be called from any thread.
*/
void onWakeup();
}
/**
* Represents a type of message that can be passed to a renderer. May be one of {@link
* #MSG_SET_VIDEO_OUTPUT}, {@link #MSG_SET_VOLUME}, {@link #MSG_SET_AUDIO_ATTRIBUTES}, {@link
* #MSG_SET_SCALING_MODE}, {@link #MSG_SET_CHANGE_FRAME_RATE_STRATEGY}, {@link
* #MSG_SET_AUX_EFFECT_INFO}, {@link #MSG_SET_VIDEO_FRAME_METADATA_LISTENER}, {@link
* #MSG_SET_CAMERA_MOTION_LISTENER}, {@link #MSG_SET_SKIP_SILENCE_ENABLED}, {@link
* #MSG_SET_AUDIO_SESSION_ID} or {@link #MSG_SET_WAKEUP_LISTENER}. May also be an app-defined
* value (see {@link #MSG_CUSTOM_BASE}).
*/
@Documented
@Retention(RetentionPolicy.SOURCE)
@Target(TYPE_USE)
@IntDef(
open = true,
value = {
MSG_SET_VIDEO_OUTPUT,
MSG_SET_VOLUME,
MSG_SET_AUDIO_ATTRIBUTES,
MSG_SET_SCALING_MODE,
MSG_SET_CHANGE_FRAME_RATE_STRATEGY,
MSG_SET_AUX_EFFECT_INFO,
MSG_SET_VIDEO_FRAME_METADATA_LISTENER,
MSG_SET_CAMERA_MOTION_LISTENER,
MSG_SET_SKIP_SILENCE_ENABLED,
MSG_SET_AUDIO_SESSION_ID,
MSG_SET_WAKEUP_LISTENER
})
public @interface MessageType {}
/**
* The type of a message that can be passed to a video renderer via {@link
* ExoPlayer#createMessage(PlayerMessage.Target)}. The message payload is normally a {@link
* Surface}, however some video renderers may accept other outputs (e.g., {@link
* VideoDecoderOutputBufferRenderer}).
*
* <p>If the receiving renderer does not support the payload type as an output, then it will clear
* any existing output that it has.
*/
int MSG_SET_VIDEO_OUTPUT = 1;
/**
* A type of a message that can be passed to an audio renderer via {@link
* ExoPlayer#createMessage(PlayerMessage.Target)}. The message payload should be a {@link Float}
* with 0 being silence and 1 being unity gain.
*/
int MSG_SET_VOLUME = 2;
/**
* A type of a message that can be passed to an audio renderer via {@link
* ExoPlayer#createMessage(PlayerMessage.Target)}. The message payload should be an {@link
* AudioAttributes} instance that will configure the underlying audio track. If not set, the
* default audio attributes will be used. They are suitable for general media playback.
*
* <p>Setting the audio attributes during playback may introduce a short gap in audio output as
* the audio track is recreated. A new audio session id will also be generated.
*
* <p>If tunneling is enabled by the track selector, the specified audio attributes will be
* ignored, but they will take effect if audio is later played without tunneling.
*
* <p>If the device is running a build before platform API version 21, audio attributes cannot be
* set directly on the underlying audio track. In this case, the usage will be mapped onto an
* equivalent stream type using {@link Util#getStreamTypeForAudioUsage(int)}.
*
* <p>To get audio attributes that are equivalent to a legacy stream type, pass the stream type to
* {@link Util#getAudioUsageForStreamType(int)} and use the returned {@link C.AudioUsage} to build
* an audio attributes instance.
*/
int MSG_SET_AUDIO_ATTRIBUTES = 3;
/**
* The type of a message that can be passed to a {@link MediaCodec}-based video renderer via
* {@link ExoPlayer#createMessage(PlayerMessage.Target)}. The message payload should be one of the
* integer scaling modes in {@link C.VideoScalingMode}.
*
* <p>Note that the scaling mode only applies if the {@link Surface} targeted by the renderer is
* owned by a {@link android.view.SurfaceView}.
*/
int MSG_SET_SCALING_MODE = 4;
/**
* The type of a message that can be passed to a video renderer via {@link
* ExoPlayer#createMessage(PlayerMessage.Target)}. The message payload should be one of the
* integer strategy constants in {@link C.VideoChangeFrameRateStrategy}.
*/
int MSG_SET_CHANGE_FRAME_RATE_STRATEGY = 5;
/**
* A type of a message that can be passed to an audio renderer via {@link
* ExoPlayer#createMessage(PlayerMessage.Target)}. The message payload should be an {@link
* AuxEffectInfo} instance representing an auxiliary audio effect for the underlying audio track.
*/
int MSG_SET_AUX_EFFECT_INFO = 6;
/**
* The type of a message that can be passed to a video renderer via {@link
* ExoPlayer#createMessage(PlayerMessage.Target)}. The message payload should be a {@link
* VideoFrameMetadataListener} instance, or null.
*/
int MSG_SET_VIDEO_FRAME_METADATA_LISTENER = 7;
/**
* The type of a message that can be passed to a camera motion renderer via {@link
* ExoPlayer#createMessage(PlayerMessage.Target)}. The message payload should be a {@link
* CameraMotionListener} instance, or null.
*/
int MSG_SET_CAMERA_MOTION_LISTENER = 8;
/**
* The type of a message that can be passed to an audio renderer via {@link
* ExoPlayer#createMessage(PlayerMessage.Target)}. The message payload should be a {@link Boolean}
* instance telling whether to enable or disable skipping silences in the audio stream.
*/
int MSG_SET_SKIP_SILENCE_ENABLED = 9;
/**
* The type of a message that can be passed to audio and video renderers via {@link
* ExoPlayer#createMessage(PlayerMessage.Target)}. The message payload should be an {@link
* Integer} instance representing the audio session ID that will be attached to the underlying
* audio track. Video renderers that support tunneling will use the audio session ID when
* tunneling is enabled.
*/
int MSG_SET_AUDIO_SESSION_ID = 10;
/**
* The type of a message that can be passed to a {@link Renderer} via {@link
* ExoPlayer#createMessage(PlayerMessage.Target)}, to inform the renderer that it can schedule
* waking up another component.
*
* <p>The message payload must be a {@link WakeupListener} instance.
*/
int MSG_SET_WAKEUP_LISTENER = 11;
/**
* The type of a message that can be passed to audio renderers via {@link
* ExoPlayer#createMessage(PlayerMessage.Target)}. The message payload should be an {@link
* android.media.AudioDeviceInfo} instance representing the preferred audio device, or null to
* restore the default.
*/
int MSG_SET_PREFERRED_AUDIO_DEVICE = 12;
/**
* Applications or extensions may define custom {@code MSG_*} constants that can be passed to
* renderers. These custom constants must be greater than or equal to this value.
*/
int MSG_CUSTOM_BASE = 10000;
/**
* The renderer states. One of {@link #STATE_DISABLED}, {@link #STATE_ENABLED} or {@link
* #STATE_STARTED}.
*/
@Documented
@Retention(RetentionPolicy.SOURCE)
@Target(TYPE_USE)
@IntDef({STATE_DISABLED, STATE_ENABLED, STATE_STARTED})
@interface State {}
/**
* The renderer is disabled. A renderer in this state will not proactively acquire resources that
* it requires for rendering (e.g., media decoders), but may continue to hold any that it already
* has. {@link #reset()} can be called to force the renderer to release such resources.
*/
int STATE_DISABLED = 0;
/**
* The renderer is enabled but not started. A renderer in this state may render media at the
* current position (e.g. an initial video frame), but the position will not advance. A renderer
* in this state will typically hold resources that it requires for rendering (e.g. media
* decoders).
*/
int STATE_ENABLED = 1;
/**
* The renderer is started. Calls to {@link #render(long, long)} will cause media to be rendered.
*/
int STATE_STARTED = 2;
/**
* Returns the name of this renderer, for logging and debugging purposes. Should typically be the
* renderer's (un-obfuscated) class name.
*
* @return The name of this renderer.
*/
String getName();
/**
* Returns the track type that the renderer handles.
*
* @see ExoPlayer#getRendererType(int)
* @return The {@link C.TrackType track type}.
*/
@C.TrackType
int getTrackType();
/**
* Returns the capabilities of the renderer.
*
* @return The capabilities of the renderer.
*/
RendererCapabilities getCapabilities();
/**
* Initializes the renderer for playback with a player.
*
* @param index The renderer index within the player.
* @param playerId The {@link PlayerId} of the player.
*/
void init(int index, PlayerId playerId);
/**
* If the renderer advances its own playback position then this method returns a corresponding
* {@link MediaClock}. If provided, the player will use the returned {@link MediaClock} as its
* source of time during playback. A player may have at most one renderer that returns a {@link
* MediaClock} from this method.
*
* @return The {@link MediaClock} tracking the playback position of the renderer, or null.
*/
@Nullable
MediaClock getMediaClock();
/**
* Returns the current state of the renderer.
*
* @return The current state. One of {@link #STATE_DISABLED}, {@link #STATE_ENABLED} and {@link
* #STATE_STARTED}.
*/
@State
int getState();
/**
* Enables the renderer to consume from the specified {@link SampleStream}.
*
* <p>This method may be called when the renderer is in the following states: {@link
* #STATE_DISABLED}.
*
* @param configuration The renderer configuration.
* @param formats The enabled formats.
* @param stream The {@link SampleStream} from which the renderer should consume.
* @param positionUs The player's current position.
* @param joining Whether this renderer is being enabled to join an ongoing playback.
* @param mayRenderStartOfStream Whether this renderer is allowed to render the start of the
* stream even if the state is not {@link #STATE_STARTED} yet.
* @param startPositionUs The start position of the stream in renderer time (microseconds).
* @param offsetUs The offset to be added to timestamps of buffers read from {@code stream} before
* they are rendered.
* @throws ExoPlaybackException If an error occurs.
*/
void enable(
RendererConfiguration configuration,
Format[] formats,
SampleStream stream,
long positionUs,
boolean joining,
boolean mayRenderStartOfStream,
long startPositionUs,
long offsetUs)
throws ExoPlaybackException;
/**
* Starts the renderer, meaning that calls to {@link #render(long, long)} will cause media to be
* rendered.
*
* <p>This method may be called when the renderer is in the following states: {@link
* #STATE_ENABLED}.
*
* @throws ExoPlaybackException If an error occurs.
*/
void start() throws ExoPlaybackException;
/**
* Replaces the {@link SampleStream} from which samples will be consumed.
*
* <p>This method may be called when the renderer is in the following states: {@link
* #STATE_ENABLED}, {@link #STATE_STARTED}.
*
* @param formats The enabled formats.
* @param stream The {@link SampleStream} from which the renderer should consume.
* @param startPositionUs The start position of the new stream in renderer time (microseconds).
* @param offsetUs The offset to be added to timestamps of buffers read from {@code stream} before
* they are rendered.
* @throws ExoPlaybackException If an error occurs.
*/
void replaceStream(Format[] formats, SampleStream stream, long startPositionUs, long offsetUs)
throws ExoPlaybackException;
/** Returns the {@link SampleStream} being consumed, or null if the renderer is disabled. */
@Nullable
SampleStream getStream();
/**
* Returns whether the renderer has read the current {@link SampleStream} to the end.
*
* <p>This method may be called when the renderer is in the following states: {@link
* #STATE_ENABLED}, {@link #STATE_STARTED}.
*/
boolean hasReadStreamToEnd();
/**
* Returns the renderer time up to which the renderer has read samples, in microseconds, or {@link
* C#TIME_END_OF_SOURCE} if the renderer has read the current {@link SampleStream} to the end.
*
* <p>This method may be called when the renderer is in the following states: {@link
* #STATE_ENABLED}, {@link #STATE_STARTED}.
*/
long getReadingPositionUs();
/**
* Signals to the renderer that the current {@link SampleStream} will be the final one supplied
* before it is next disabled or reset.
*
* <p>This method may be called when the renderer is in the following states: {@link
* #STATE_ENABLED}, {@link #STATE_STARTED}.
*/
void setCurrentStreamFinal();
/**
* Returns whether the current {@link SampleStream} will be the final one supplied before the
* renderer is next disabled or reset.
*/
boolean isCurrentStreamFinal();
/**
* Throws an error that's preventing the renderer from reading from its {@link SampleStream}. Does
* nothing if no such error exists.
*
* <p>This method may be called when the renderer is in the following states: {@link
* #STATE_ENABLED}, {@link #STATE_STARTED}.
*
* @throws IOException An error that's preventing the renderer from making progress or buffering
* more data.
*/
void maybeThrowStreamError() throws IOException;
/**
* Signals to the renderer that a position discontinuity has occurred.
*
* <p>After a position discontinuity, the renderer's {@link SampleStream} is guaranteed to provide
* samples starting from a key frame.
*
* <p>This method may be called when the renderer is in the following states: {@link
* #STATE_ENABLED}, {@link #STATE_STARTED}.
*
* @param positionUs The new playback position in microseconds.
* @throws ExoPlaybackException If an error occurs handling the reset.
*/
void resetPosition(long positionUs) throws ExoPlaybackException;
/**
* Indicates the playback speed to this renderer.
*
* <p>The default implementation is a no-op.
*
* @param currentPlaybackSpeed The factor by which playback is currently sped up.
* @param targetPlaybackSpeed The target factor by which playback should be sped up. This may be
* different from {@code currentPlaybackSpeed}, for example, if the speed is temporarily
* adjusted for live playback.
* @throws ExoPlaybackException If an error occurs handling the playback speed.
*/
default void setPlaybackSpeed(float currentPlaybackSpeed, float targetPlaybackSpeed)
throws ExoPlaybackException {}
/**
* Incrementally renders the {@link SampleStream}.
*
* <p>If the renderer is in the {@link #STATE_ENABLED} state then each call to this method will do
* work toward being ready to render the {@link SampleStream} when the renderer is started. If the
* renderer is in the {@link #STATE_STARTED} state then calls to this method will render the
* {@link SampleStream} in sync with the specified media positions.
*
* <p>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 {@link #STATE_ENABLED} state, unless it's the
* initial start of the media after calling {@link #enable(RendererConfiguration, Format[],
* SampleStream, long, boolean, boolean, long, long)} with {@code mayRenderStartOfStream} set to
* {@code false}.
*
* <p>This method should return quickly, and should not block if the renderer is unable to make
* useful progress.
*
* <p>This method may be called when the renderer is in the following states: {@link
* #STATE_ENABLED}, {@link #STATE_STARTED}.
*
* @param positionUs The current media time in microseconds, measured at the start of the current
* iteration of the rendering loop.
* @param elapsedRealtimeUs {@link android.os.SystemClock#elapsedRealtime()} in microseconds,
* measured at the start of the current iteration of the rendering loop.
* @throws ExoPlaybackException If an error occurs.
*/
void render(long positionUs, long elapsedRealtimeUs) throws ExoPlaybackException;
/**
* Whether the renderer is able to immediately render media from the current position.
*
* <p>If the renderer is in the {@link #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.
*
* <p>If the renderer is in the {@link #STATE_ENABLED} state then returning true indicates that
* the renderer is ready for playback to be started. Returning false indicates that it is not.
*
* <p>This method may be called when the renderer is in the following states: {@link
* #STATE_ENABLED}, {@link #STATE_STARTED}.
*
* @return Whether the renderer is ready to render media.
*/
boolean isReady();
/**
* Whether the renderer is ready for the {@link ExoPlayer} instance to transition to {@link
* Player#STATE_ENDED}. The player will make this transition as soon as {@code true} is returned
* by all of its renderers.
*
* <p>This method may be called when the renderer is in the following states: {@link
* #STATE_ENABLED}, {@link #STATE_STARTED}.
*
* @return Whether the renderer is ready for the player to transition to the ended state.
*/
boolean isEnded();
/**
* Stops the renderer, transitioning it to the {@link #STATE_ENABLED} state.
*
* <p>This method may be called when the renderer is in the following states: {@link
* #STATE_STARTED}.
*/
void stop();
/**
* Disable the renderer, transitioning it to the {@link #STATE_DISABLED} state.
*
* <p>This method may be called when the renderer is in the following states: {@link
* #STATE_ENABLED}.
*/
void disable();
/**
* Forces the renderer to give up any resources (e.g. media decoders) that it may be holding. If
* the renderer is not holding any resources, the call is a no-op.
*
* <p>This method may be called when the renderer is in the following states: {@link
* #STATE_DISABLED}.
*/
void reset();
}