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Further cleanup of updateSelectedTrack

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- Return early if the selection is unchanged.
- Remove unnecessary variables.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=158138187
This commit is contained in:
olly 2017-06-06 07:31:01 -07:00 committed by Oliver Woodman
parent 8241bb8a6e
commit 79048ffae6
1 changed files with 11 additions and 10 deletions
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21
library/core/src/main/java/com/google/android/exoplayer2/trackselection/AdaptiveTrackSelection.java
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@ -154,23 +154,24 @@ public class AdaptiveTrackSelection extends BaseTrackSelection {
@Override
public void updateSelectedTrack(long bufferedDurationUs) {
long nowMs = SystemClock.elapsedRealtime();
// Get the current and ideal selections.
// Stash the current selection, then make a new one.
int currentSelectedIndex = selectedIndex;
int idealSelectedIndex = determineIdealSelectedIndex(nowMs);
// Assume we can switch to the ideal selection.
selectedIndex = idealSelectedIndex;
// Revert back to the current selection if conditions are not suitable for switching.
selectedIndex = determineIdealSelectedIndex(nowMs);
if (selectedIndex == currentSelectedIndex) {
return;
}
if (!isBlacklisted(currentSelectedIndex, nowMs)) {
// Revert back to the current selection if conditions are not suitable for switching.
Format currentFormat = getFormat(currentSelectedIndex);
Format idealFormat = getFormat(idealSelectedIndex);
if (idealFormat.bitrate > currentFormat.bitrate
Format selectedFormat = getFormat(selectedIndex);
if (selectedFormat.bitrate > currentFormat.bitrate
&& bufferedDurationUs < minDurationForQualityIncreaseUs) {
// The ideal track is a higher quality, but we have insufficient buffer to safely switch
// The selected track is a higher quality, but we have insufficient buffer to safely switch
// up. Defer switching up for now.
selectedIndex = currentSelectedIndex;
} else if (idealFormat.bitrate < currentFormat.bitrate
} else if (selectedFormat.bitrate < currentFormat.bitrate
&& bufferedDurationUs >= maxDurationForQualityDecreaseUs) {
// The ideal track is a lower quality, but we have sufficient buffer to defer switching
// The selected track is a lower quality, but we have sufficient buffer to defer switching
// down for now.
selectedIndex = currentSelectedIndex;
}