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Reintroducing existing logic as requested here https://github.com/google/ExoPlayer/pull/6178#pullrequestreview-261298162

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This commit is contained in:
Yannick RUI 2019-07-15 11:35:32 +02:00
parent 29a099cf03
commit af98883a7b
1 changed files with 75 additions and 56 deletions
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131
library/core/src/main/java/com/google/android/exoplayer2/trackselection/DefaultTrackSelector.java
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@ -1555,29 +1555,39 @@ public class DefaultTrackSelector extends MappingTrackSelector {
TextTrackScore selectedTextTrackScore = null;
int selectedTextRendererIndex = C.INDEX_UNSET;
for (int i = 0; i < rendererCount; i++) {
// The below behaviour is different from video and audio track selection
// i.e. do not perform a text track pre selection if there are no preferredTextLanguage requested.
if (C.TRACK_TYPE_TEXT == mappedTrackInfo.getRendererType(i) && params.preferredTextLanguage != null) {
Pair<TrackSelection.Definition, TextTrackScore> textSelection =
selectTextTrack(
mappedTrackInfo.getTrackGroups(i),
rendererFormatSupports[i],
params);
if (textSelection != null
&& (selectedTextTrackScore == null
|| textSelection.second.compareTo(selectedTextTrackScore) > 0)) {
if (selectedTextRendererIndex != C.INDEX_UNSET) {
// We've already made a selection for another text renderer, but it had a lower
// score. Clear the selection for that renderer.
definitions[selectedTextRendererIndex] = null;
int trackType = mappedTrackInfo.getRendererType(i);
switch (trackType) {
case C.TRACK_TYPE_VIDEO:
case C.TRACK_TYPE_AUDIO:
// Already done. Do nothing.
break;
case C.TRACK_TYPE_TEXT:
Pair<TrackSelection.Definition, TextTrackScore> textSelection =
selectTextTrack(
mappedTrackInfo.getTrackGroups(i),
rendererFormatSupports[i],
params,
selectedAudioLanguage);
if (textSelection != null
&& (selectedTextTrackScore == null
|| textSelection.second.compareTo(selectedTextTrackScore) > 0)) {
if (selectedTextRendererIndex != C.INDEX_UNSET) {
// We've already made a selection for another text renderer, but it had a lower
// score. Clear the selection for that renderer.
definitions[selectedTextRendererIndex] = null;
}
definitions[i] = textSelection.first;
selectedTextTrackScore = textSelection.second;
selectedTextRendererIndex = i;
}
TrackSelection.Definition definition = textSelection.first;
definitions[i] = definition;
selectedTextTrackScore = textSelection.second;
selectedTextRendererIndex = i;
break;
default:
definitions[i] =
selectOtherTrack(
trackType, mappedTrackInfo.getTrackGroups(i), rendererFormatSupports[i], params);
break;
}
}
}
return definitions;
}
@ -2052,7 +2062,8 @@ public class DefaultTrackSelector extends MappingTrackSelector {
protected Pair<TrackSelection.Definition, TextTrackScore> selectTextTrack(
TrackGroupArray groups,
int[][] formatSupport,
Parameters params)
Parameters params,
@Nullable String selectedAudioLanguage)
throws ExoPlaybackException {
TrackGroup selectedGroup = null;
int selectedTrackIndex = C.INDEX_UNSET;
@ -2064,7 +2075,7 @@ public class DefaultTrackSelector extends MappingTrackSelector {
if (isSupported(trackFormatSupport[trackIndex],
params.exceedRendererCapabilitiesIfNecessary)) {
Format format = trackGroup.getFormat(trackIndex);
TextTrackScore trackScore = new TextTrackScore(format, params, trackFormatSupport[trackIndex]);
TextTrackScore trackScore = new TextTrackScore(format, params, trackFormatSupport[trackIndex], selectedAudioLanguage);
if ((selectedTrackScore == null) || trackScore.compareTo(selectedTrackScore) > 0) {
selectedGroup = trackGroup;
selectedTrackIndex = trackIndex;
@ -2497,29 +2508,49 @@ public class DefaultTrackSelector extends MappingTrackSelector {
/** Represents how well an text track matches the selection {@link Parameters}. */
protected static final class TextTrackScore implements Comparable<TextTrackScore> {
private final boolean isWithinRendererCapabilities;
private final int preferredLanguageScore;
private final int localeLanguageMatchIndex;
private final int localeLanguageScore;
private final boolean isDefaultSelectionFlag;
private final boolean isDefault;
private final boolean isForced;
private final int languageScore;
private final boolean trackHasNoLanguage;
private int bestMatchScore = 0;
public TextTrackScore(Format format, Parameters parameters, int formatSupport) {
isWithinRendererCapabilities = isSupported(formatSupport, false);
preferredLanguageScore = getFormatLanguageScore(format, parameters.preferredTextLanguage);
isDefaultSelectionFlag = (format.selectionFlags & C.SELECTION_FLAG_DEFAULT) != 0;
String[] localeLanguages = Util.getSystemLanguageCodes();
int bestMatchIndex = Integer.MAX_VALUE;
int bestMatchScore = 0;
for (int i = 0; i < localeLanguages.length; i++) {
int score = getFormatLanguageScore(format, localeLanguages[i]);
if (score > 0) {
bestMatchIndex = i;
bestMatchScore = score;
break;
public TextTrackScore(
Format format,
Parameters parameters,
int trackFormatSupport,
@Nullable String selectedAudioLanguage) {
languageScore = getFormatLanguageScore(format, parameters.preferredTextLanguage);
int maskedSelectionFlags =
format.selectionFlags & ~parameters.disabledTextTrackSelectionFlags;
isDefault = (format.selectionFlags & C.SELECTION_FLAG_DEFAULT) != 0;
isForced = (maskedSelectionFlags & C.SELECTION_FLAG_FORCED) != 0;
trackHasNoLanguage = formatHasNoLanguage(format);
if (languageScore > 0 || (parameters.selectUndeterminedTextLanguage && trackHasNoLanguage)) {
if (isDefault) {
bestMatchScore = 11;
} else if (!isForced) {
// Prefer non-forced to forced if a preferred text language has been specified. Where
// both are provided the non-forced track will usually contain the forced subtitles as
// a subset.
bestMatchScore = 7;
} else {
bestMatchScore = 3;
}
bestMatchScore += languageScore;
} else if (isDefault) {
bestMatchScore = 2;
} else if (isForced
&& (languageScore > 0
|| (trackHasNoLanguage && stringDefinesNoLanguage(selectedAudioLanguage)))) {
bestMatchScore = 1;
} else {
// Track should not be selected.
bestMatchScore = -1;
}
if (isSupported(trackFormatSupport, false)) {
bestMatchScore += WITHIN_RENDERER_CAPABILITIES_BONUS;
}
localeLanguageMatchIndex = bestMatchIndex;
localeLanguageScore = bestMatchScore;
}
/**
@ -2531,20 +2562,8 @@ public class DefaultTrackSelector extends MappingTrackSelector {
*/
@Override
public int compareTo(@NonNull TextTrackScore other) {
if (this.isWithinRendererCapabilities != other.isWithinRendererCapabilities) {
return this.isWithinRendererCapabilities ? 1 : -1;
}
if (this.preferredLanguageScore != other.preferredLanguageScore) {
return compareInts(this.preferredLanguageScore, other.preferredLanguageScore);
}
if (this.isDefaultSelectionFlag != other.isDefaultSelectionFlag) {
return this.isDefaultSelectionFlag ? 1 : -1;
}
if (this.localeLanguageMatchIndex != other.localeLanguageMatchIndex) {
return -compareInts(this.localeLanguageMatchIndex, other.localeLanguageMatchIndex);
}
if (this.localeLanguageScore != other.localeLanguageScore) {
return compareInts(this.localeLanguageScore, other.localeLanguageScore);
if (this.bestMatchScore != other.bestMatchScore) {
return compareInts(this.bestMatchScore, other.bestMatchScore);
}
return 0;
}