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Update default min duration for playbacks with video to match max duration.

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Experiments show this is beneficial for rebuffers with only minor impact
on battery usage.

Configurations which explicitly set a minimum buffer duration are unaffected.

Issue:#2083
PiperOrigin-RevId: 244823642
This commit is contained in:
tonihei 2019-04-23 11:00:55 +01:00 committed by Oliver Woodman
parent d89f3eeb29
commit 9725132e3c
2 changed files with 62 additions and 17 deletions
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2
RELEASENOTES.md
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@ -120,6 +120,8 @@
order when in shuffle mode.
* Allow handling of custom commands via `registerCustomCommandReceiver`.
* Add ability to include an extras `Bundle` when reporting a custom error.
* LoadControl: Set minimum buffer for playbacks with video equal to maximum
buffer ([#2083](https://github.com/google/ExoPlayer/issues/2083)).
### 2.9.6 ###

77
library/core/src/main/java/com/google/android/exoplayer2/DefaultLoadControl.java
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@ -29,12 +29,14 @@ public class DefaultLoadControl implements LoadControl {
/**
* The default minimum duration of media that the player will attempt to ensure is buffered at all
* times, in milliseconds.
* times, in milliseconds. This value is only applied to playbacks without video.
*/
public static final int DEFAULT_MIN_BUFFER_MS = 15000;
/**
* The default maximum duration of media that the player will attempt to buffer, in milliseconds.
* For playbacks with video, this is also the default minimum duration of media that the player
* will attempt to ensure is buffered.
*/
public static final int DEFAULT_MAX_BUFFER_MS = 50000;
@ -69,7 +71,8 @@ public class DefaultLoadControl implements LoadControl {
public static final class Builder {
private DefaultAllocator allocator;
private int minBufferMs;
private int minBufferAudioMs;
private int minBufferVideoMs;
private int maxBufferMs;
private int bufferForPlaybackMs;
private int bufferForPlaybackAfterRebufferMs;
@ -81,7 +84,8 @@ public class DefaultLoadControl implements LoadControl {
/** Constructs a new instance. */
public Builder() {
minBufferMs = DEFAULT_MIN_BUFFER_MS;
minBufferAudioMs = DEFAULT_MIN_BUFFER_MS;
minBufferVideoMs = DEFAULT_MAX_BUFFER_MS;
maxBufferMs = DEFAULT_MAX_BUFFER_MS;
bufferForPlaybackMs = DEFAULT_BUFFER_FOR_PLAYBACK_MS;
bufferForPlaybackAfterRebufferMs = DEFAULT_BUFFER_FOR_PLAYBACK_AFTER_REBUFFER_MS;
@ -125,7 +129,18 @@ public class DefaultLoadControl implements LoadControl {
int bufferForPlaybackMs,
int bufferForPlaybackAfterRebufferMs) {
Assertions.checkState(!createDefaultLoadControlCalled);
this.minBufferMs = minBufferMs;
assertGreaterOrEqual(bufferForPlaybackMs, 0, "bufferForPlaybackMs", "0");
assertGreaterOrEqual(
bufferForPlaybackAfterRebufferMs, 0, "bufferForPlaybackAfterRebufferMs", "0");
assertGreaterOrEqual(minBufferMs, bufferForPlaybackMs, "minBufferMs", "bufferForPlaybackMs");
assertGreaterOrEqual(
minBufferMs,
bufferForPlaybackAfterRebufferMs,
"minBufferMs",
"bufferForPlaybackAfterRebufferMs");
assertGreaterOrEqual(maxBufferMs, minBufferMs, "maxBufferMs", "minBufferMs");
this.minBufferAudioMs = minBufferMs;
this.minBufferVideoMs = minBufferMs;
this.maxBufferMs = maxBufferMs;
this.bufferForPlaybackMs = bufferForPlaybackMs;
this.bufferForPlaybackAfterRebufferMs = bufferForPlaybackAfterRebufferMs;
@ -173,6 +188,7 @@ public class DefaultLoadControl implements LoadControl {
*/
public Builder setBackBuffer(int backBufferDurationMs, boolean retainBackBufferFromKeyframe) {
Assertions.checkState(!createDefaultLoadControlCalled);
assertGreaterOrEqual(backBufferDurationMs, 0, "backBufferDurationMs", "0");
this.backBufferDurationMs = backBufferDurationMs;
this.retainBackBufferFromKeyframe = retainBackBufferFromKeyframe;
return this;
@ -187,7 +203,8 @@ public class DefaultLoadControl implements LoadControl {
}
return new DefaultLoadControl(
allocator,
minBufferMs,
minBufferAudioMs,
minBufferVideoMs,
maxBufferMs,
bufferForPlaybackMs,
bufferForPlaybackAfterRebufferMs,
@ -200,7 +217,8 @@ public class DefaultLoadControl implements LoadControl {
private final DefaultAllocator allocator;
private final long minBufferUs;
private final long minBufferAudioUs;
private final long minBufferVideoUs;
private final long maxBufferUs;
private final long bufferForPlaybackUs;
private final long bufferForPlaybackAfterRebufferUs;
@ -211,6 +229,7 @@ public class DefaultLoadControl implements LoadControl {
private int targetBufferSize;
private boolean isBuffering;
private boolean hasVideo;
/** Constructs a new instance, using the {@code DEFAULT_*} constants defined in this class. */
@SuppressWarnings("deprecation")
@ -220,16 +239,18 @@ public class DefaultLoadControl implements LoadControl {
/** @deprecated Use {@link Builder} instead. */
@Deprecated
@SuppressWarnings("deprecation")
public DefaultLoadControl(DefaultAllocator allocator) {
this(
allocator,
DEFAULT_MIN_BUFFER_MS,
/* minBufferAudioMs= */ DEFAULT_MIN_BUFFER_MS,
/* minBufferVideoMs= */ DEFAULT_MAX_BUFFER_MS,
DEFAULT_MAX_BUFFER_MS,
DEFAULT_BUFFER_FOR_PLAYBACK_MS,
DEFAULT_BUFFER_FOR_PLAYBACK_AFTER_REBUFFER_MS,
DEFAULT_TARGET_BUFFER_BYTES,
DEFAULT_PRIORITIZE_TIME_OVER_SIZE_THRESHOLDS);
DEFAULT_PRIORITIZE_TIME_OVER_SIZE_THRESHOLDS,
DEFAULT_BACK_BUFFER_DURATION_MS,
DEFAULT_RETAIN_BACK_BUFFER_FROM_KEYFRAME);
}
/** @deprecated Use {@link Builder} instead. */
@ -244,7 +265,8 @@ public class DefaultLoadControl implements LoadControl {
boolean prioritizeTimeOverSizeThresholds) {
this(
allocator,
minBufferMs,
/* minBufferAudioMs= */ minBufferMs,
/* minBufferVideoMs= */ minBufferMs,
maxBufferMs,
bufferForPlaybackMs,
bufferForPlaybackAfterRebufferMs,
@ -256,7 +278,8 @@ public class DefaultLoadControl implements LoadControl {
protected DefaultLoadControl(
DefaultAllocator allocator,
int minBufferMs,
int minBufferAudioMs,
int minBufferVideoMs,
int maxBufferMs,
int bufferForPlaybackMs,
int bufferForPlaybackAfterRebufferMs,
@ -267,17 +290,27 @@ public class DefaultLoadControl implements LoadControl {
assertGreaterOrEqual(bufferForPlaybackMs, 0, "bufferForPlaybackMs", "0");
assertGreaterOrEqual(
bufferForPlaybackAfterRebufferMs, 0, "bufferForPlaybackAfterRebufferMs", "0");
assertGreaterOrEqual(minBufferMs, bufferForPlaybackMs, "minBufferMs", "bufferForPlaybackMs");
assertGreaterOrEqual(
minBufferMs,
minBufferAudioMs, bufferForPlaybackMs, "minBufferAudioMs", "bufferForPlaybackMs");
assertGreaterOrEqual(
minBufferVideoMs, bufferForPlaybackMs, "minBufferVideoMs", "bufferForPlaybackMs");
assertGreaterOrEqual(
minBufferAudioMs,
bufferForPlaybackAfterRebufferMs,
"minBufferMs",
"minBufferAudioMs",
"bufferForPlaybackAfterRebufferMs");
assertGreaterOrEqual(maxBufferMs, minBufferMs, "maxBufferMs", "minBufferMs");
assertGreaterOrEqual(
minBufferVideoMs,
bufferForPlaybackAfterRebufferMs,
"minBufferVideoMs",
"bufferForPlaybackAfterRebufferMs");
assertGreaterOrEqual(maxBufferMs, minBufferAudioMs, "maxBufferMs", "minBufferAudioMs");
assertGreaterOrEqual(maxBufferMs, minBufferVideoMs, "maxBufferMs", "minBufferVideoMs");
assertGreaterOrEqual(backBufferDurationMs, 0, "backBufferDurationMs", "0");
this.allocator = allocator;
this.minBufferUs = C.msToUs(minBufferMs);
this.minBufferAudioUs = C.msToUs(minBufferAudioMs);
this.minBufferVideoUs = C.msToUs(minBufferVideoMs);
this.maxBufferUs = C.msToUs(maxBufferMs);
this.bufferForPlaybackUs = C.msToUs(bufferForPlaybackMs);
this.bufferForPlaybackAfterRebufferUs = C.msToUs(bufferForPlaybackAfterRebufferMs);
@ -295,6 +328,7 @@ public class DefaultLoadControl implements LoadControl {
@Override
public void onTracksSelected(Renderer[] renderers, TrackGroupArray trackGroups,
TrackSelectionArray trackSelections) {
hasVideo = hasVideo(renderers, trackSelections);
targetBufferSize =
targetBufferBytesOverwrite == C.LENGTH_UNSET
? calculateTargetBufferSize(renderers, trackSelections)
@ -330,7 +364,7 @@ public class DefaultLoadControl implements LoadControl {
@Override
public boolean shouldContinueLoading(long bufferedDurationUs, float playbackSpeed) {
boolean targetBufferSizeReached = allocator.getTotalBytesAllocated() >= targetBufferSize;
long minBufferUs = this.minBufferUs;
long minBufferUs = hasVideo ? minBufferVideoUs : minBufferAudioUs;
if (playbackSpeed > 1) {
// The playback speed is faster than real time, so scale up the minimum required media
// duration to keep enough media buffered for a playout duration of minBufferUs.
@ -384,6 +418,15 @@ public class DefaultLoadControl implements LoadControl {
}
}
private static boolean hasVideo(Renderer[] renderers, TrackSelectionArray trackSelectionArray) {
for (int i = 0; i < renderers.length; i++) {
if (renderers[i].getTrackType() == C.TRACK_TYPE_VIDEO && trackSelectionArray.get(i) != null) {
return true;
}
}
return false;
}
private static void assertGreaterOrEqual(int value1, int value2, String name1, String name2) {
Assertions.checkArgument(value1 >= value2, name1 + " cannot be less than " + name2);
}