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Post AudioFocusManager.onAudioFocusChange events to eventHandler.

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PiperOrigin-RevId: 276452333
This commit is contained in:
samrobinson 2019-10-24 11:17:02 +01:00 committed by Oliver Woodman
parent 3a84b787b1
commit b99203dada
4 changed files with 77 additions and 58 deletions
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2
RELEASENOTES.md
View File

@ -85,6 +85,8 @@
`VideoDecoderOutputBufferRenderer`, instead of `VideoDecoderSurfaceView`.
* Add automatic audio becoming noisy handling to `SimpleExoPlayer`,
available through `SimpleExoPlayer.setHandleAudioBecomingNoisy`.
* Post `AudioFocusManager.onAudioFocusChange` events to eventHandler, avoiding
multithreaded access to the player or audio focus manager.
* Add `Timeline.Window.isLive` to indicate that a window is a live stream
([#2668](https://github.com/google/ExoPlayer/issues/2668) and
[#5973](https://github.com/google/ExoPlayer/issues/5973)).

124
library/core/src/main/java/com/google/android/exoplayer2/AudioFocusManager.java
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@ -18,6 +18,7 @@ package com.google.android.exoplayer2;
import android.content.Context;
import android.media.AudioFocusRequest;
import android.media.AudioManager;
import android.os.Handler;
import androidx.annotation.IntDef;
import androidx.annotation.Nullable;
import androidx.annotation.RequiresApi;
@ -114,13 +115,14 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
* Constructs an AudioFocusManager to automatically handle audio focus for a player.
*
* @param context The current context.
* @param eventHandler A {@link Handler} to for the thread on which the player is used.
* @param playerControl A {@link PlayerControl} to handle commands from this instance.
*/
public AudioFocusManager(Context context, PlayerControl playerControl) {
public AudioFocusManager(Context context, Handler eventHandler, PlayerControl playerControl) {
this.audioManager =
(AudioManager) context.getApplicationContext().getSystemService(Context.AUDIO_SERVICE);
this.playerControl = playerControl;
this.focusListener = new AudioFocusListener();
this.focusListener = new AudioFocusListener(eventHandler);
this.audioFocusState = AUDIO_FOCUS_STATE_NO_FOCUS;
}
@ -380,65 +382,75 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
}
}
private void handleAudioFocusChange(int focusChange) {
// Convert the platform focus change to internal state.
switch (focusChange) {
case AudioManager.AUDIOFOCUS_LOSS:
audioFocusState = AUDIO_FOCUS_STATE_LOST_FOCUS;
break;
case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
audioFocusState = AUDIO_FOCUS_STATE_LOSS_TRANSIENT;
break;
case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
if (willPauseWhenDucked()) {
audioFocusState = AUDIO_FOCUS_STATE_LOSS_TRANSIENT;
} else {
audioFocusState = AUDIO_FOCUS_STATE_LOSS_TRANSIENT_DUCK;
}
break;
case AudioManager.AUDIOFOCUS_GAIN:
audioFocusState = AUDIO_FOCUS_STATE_HAVE_FOCUS;
break;
default:
Log.w(TAG, "Unknown focus change type: " + focusChange);
// Early return.
return;
}
// Handle the internal state (change).
switch (audioFocusState) {
case AUDIO_FOCUS_STATE_NO_FOCUS:
// Focus was not requested; nothing to do.
break;
case AUDIO_FOCUS_STATE_LOST_FOCUS:
playerControl.executePlayerCommand(PLAYER_COMMAND_DO_NOT_PLAY);
abandonAudioFocus(/* forceAbandon= */ true);
break;
case AUDIO_FOCUS_STATE_LOSS_TRANSIENT:
playerControl.executePlayerCommand(PLAYER_COMMAND_WAIT_FOR_CALLBACK);
break;
case AUDIO_FOCUS_STATE_LOSS_TRANSIENT_DUCK:
// Volume will be adjusted by the code below.
break;
case AUDIO_FOCUS_STATE_HAVE_FOCUS:
playerControl.executePlayerCommand(PLAYER_COMMAND_PLAY_WHEN_READY);
break;
default:
throw new IllegalStateException("Unknown audio focus state: " + audioFocusState);
}
float volumeMultiplier =
(audioFocusState == AUDIO_FOCUS_STATE_LOSS_TRANSIENT_DUCK)
? AudioFocusManager.VOLUME_MULTIPLIER_DUCK
: AudioFocusManager.VOLUME_MULTIPLIER_DEFAULT;
if (AudioFocusManager.this.volumeMultiplier != volumeMultiplier) {
AudioFocusManager.this.volumeMultiplier = volumeMultiplier;
playerControl.setVolumeMultiplier(volumeMultiplier);
}
}
// Internal audio focus listener.
private class AudioFocusListener implements AudioManager.OnAudioFocusChangeListener {
private final Handler eventHandler;
public AudioFocusListener(Handler eventHandler) {
this.eventHandler = eventHandler;
}
@Override
public void onAudioFocusChange(int focusChange) {
// Convert the platform focus change to internal state.
switch (focusChange) {
case AudioManager.AUDIOFOCUS_LOSS:
audioFocusState = AUDIO_FOCUS_STATE_LOST_FOCUS;
break;
case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
audioFocusState = AUDIO_FOCUS_STATE_LOSS_TRANSIENT;
break;
case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
if (willPauseWhenDucked()) {
audioFocusState = AUDIO_FOCUS_STATE_LOSS_TRANSIENT;
} else {
audioFocusState = AUDIO_FOCUS_STATE_LOSS_TRANSIENT_DUCK;
}
break;
case AudioManager.AUDIOFOCUS_GAIN:
audioFocusState = AUDIO_FOCUS_STATE_HAVE_FOCUS;
break;
default:
Log.w(TAG, "Unknown focus change type: " + focusChange);
// Early return.
return;
}
// Handle the internal state (change).
switch (audioFocusState) {
case AUDIO_FOCUS_STATE_NO_FOCUS:
// Focus was not requested; nothing to do.
break;
case AUDIO_FOCUS_STATE_LOST_FOCUS:
playerControl.executePlayerCommand(PLAYER_COMMAND_DO_NOT_PLAY);
abandonAudioFocus(/* forceAbandon= */ true);
break;
case AUDIO_FOCUS_STATE_LOSS_TRANSIENT:
playerControl.executePlayerCommand(PLAYER_COMMAND_WAIT_FOR_CALLBACK);
break;
case AUDIO_FOCUS_STATE_LOSS_TRANSIENT_DUCK:
// Volume will be adjusted by the code below.
break;
case AUDIO_FOCUS_STATE_HAVE_FOCUS:
playerControl.executePlayerCommand(PLAYER_COMMAND_PLAY_WHEN_READY);
break;
default:
throw new IllegalStateException("Unknown audio focus state: " + audioFocusState);
}
float volumeMultiplier =
(audioFocusState == AUDIO_FOCUS_STATE_LOSS_TRANSIENT_DUCK)
? AudioFocusManager.VOLUME_MULTIPLIER_DUCK
: AudioFocusManager.VOLUME_MULTIPLIER_DEFAULT;
if (AudioFocusManager.this.volumeMultiplier != volumeMultiplier) {
AudioFocusManager.this.volumeMultiplier = volumeMultiplier;
playerControl.setVolumeMultiplier(volumeMultiplier);
}
eventHandler.post(() -> handleAudioFocusChange(focusChange));
}
}
}

2
library/core/src/main/java/com/google/android/exoplayer2/SimpleExoPlayer.java
View File

@ -456,7 +456,7 @@ public class SimpleExoPlayer extends BasePlayer
}
audioBecomingNoisyManager =
new AudioBecomingNoisyManager(context, eventHandler, componentListener);
audioFocusManager = new AudioFocusManager(context, componentListener);
audioFocusManager = new AudioFocusManager(context, eventHandler, componentListener);
wakeLockManager = new WakeLockManager(context);
}

7
library/core/src/test/java/com/google/android/exoplayer2/AudioFocusManagerTest.java
View File

@ -25,6 +25,8 @@ import static org.robolectric.annotation.Config.TARGET_SDK;
import android.content.Context;
import android.media.AudioFocusRequest;
import android.media.AudioManager;
import android.os.Handler;
import android.os.Looper;
import androidx.test.core.app.ApplicationProvider;
import androidx.test.ext.junit.runners.AndroidJUnit4;
import com.google.android.exoplayer2.audio.AudioAttributes;
@ -54,7 +56,10 @@ public class AudioFocusManagerTest {
testPlayerControl = new TestPlayerControl();
audioFocusManager =
new AudioFocusManager(ApplicationProvider.getApplicationContext(), testPlayerControl);
new AudioFocusManager(
ApplicationProvider.getApplicationContext(),
new Handler(Looper.myLooper()),
testPlayerControl);
}
@Test