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Encode WebVTT size computation in WebvttCue.java

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Relevant part of the spec:
https://www.w3.org/TR/webvtt1/#processing-cue-settings

PiperOrigin-RevId: 277523694
This commit is contained in:
ibaker 2019-10-30 16:43:14 +00:00 committed by Oliver Woodman
parent d29d452617
commit f5377d9b11
1 changed files with 21 additions and 0 deletions
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21
library/core/src/main/java/com/google/android/exoplayer2/text/webvtt/WebvttCue.java
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@ -163,6 +163,8 @@ public final class WebvttCue extends Cue {
positionAnchor = derivePositionAnchor(textAlignment);
}
width = Math.min(width, deriveMaxSize(positionAnchor, position));
return new WebvttCue(
startTime,
endTime,
@ -290,5 +292,24 @@ public final class WebvttCue extends Cue {
return null;
}
}
// Step 2 here: https://www.w3.org/TR/webvtt1/#processing-cue-settings
private static float deriveMaxSize(@AnchorType int positionAnchor, float position) {
switch (positionAnchor) {
case Cue.ANCHOR_TYPE_START:
return 1.0f - position;
case Cue.ANCHOR_TYPE_END:
return position;
case Cue.ANCHOR_TYPE_MIDDLE:
if (position <= 0.5f) {
return position * 2;
} else {
return (1.0f - position) * 2;
}
case Cue.TYPE_UNSET:
default:
throw new IllegalStateException(String.valueOf(positionAnchor));
}
}
}
}