1 files changed, 115 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/text/webvtt/WebvttSubtitle.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/text/webvtt/WebvttSubtitle.java
new file mode 100644
index 0000000000..558c699eba
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/text/webvtt/WebvttSubtitle.java
@@ -0,0 +1,115 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.mozilla.thirdparty.com.google.android.exoplayer2.text.webvtt;
+
+import android.text.SpannableStringBuilder;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.text.Cue;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.text.Subtitle;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Assertions;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Util;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * A representation of a WebVTT subtitle.
+ */
+/* package */ final class WebvttSubtitle implements Subtitle {
+
+  private final List<WebvttCue> cues;
+  private final int numCues;
+  private final long[] cueTimesUs;
+  private final long[] sortedCueTimesUs;
+
+  /**
+   * @param cues A list of the cues in this subtitle.
+   */
+  public WebvttSubtitle(List<WebvttCue> cues) {
+    this.cues = cues;
+    numCues = cues.size();
+    cueTimesUs = new long[2 * numCues];
+    for (int cueIndex = 0; cueIndex < numCues; cueIndex++) {
+      WebvttCue cue = cues.get(cueIndex);
+      int arrayIndex = cueIndex * 2;
+      cueTimesUs[arrayIndex] = cue.startTime;
+      cueTimesUs[arrayIndex + 1] = cue.endTime;
+    }
+    sortedCueTimesUs = Arrays.copyOf(cueTimesUs, cueTimesUs.length);
+    Arrays.sort(sortedCueTimesUs);
+  }
+
+  @Override
+  public int getNextEventTimeIndex(long timeUs) {
+    int index = Util.binarySearchCeil(sortedCueTimesUs, timeUs, false, false);
+    return index < sortedCueTimesUs.length ? index : C.INDEX_UNSET;
+  }
+
+  @Override
+  public int getEventTimeCount() {
+    return sortedCueTimesUs.length;
+  }
+
+  @Override
+  public long getEventTime(int index) {
+    Assertions.checkArgument(index >= 0);
+    Assertions.checkArgument(index < sortedCueTimesUs.length);
+    return sortedCueTimesUs[index];
+  }
+
+  @Override
+  public List<Cue> getCues(long timeUs) {
+    List<Cue> list = new ArrayList<>();
+    WebvttCue firstNormalCue = null;
+    SpannableStringBuilder normalCueTextBuilder = null;
+
+    for (int i = 0; i < numCues; i++) {
+      if ((cueTimesUs[i * 2] <= timeUs) && (timeUs < cueTimesUs[i * 2 + 1])) {
+        WebvttCue cue = cues.get(i);
+        // TODO(ibaker): Replace this with a closer implementation of the WebVTT spec (keeping
+        // individual cues, but tweaking their `line` value):
+        // https://www.w3.org/TR/webvtt1/#cue-computed-line
+        if (cue.isNormalCue()) {
+          // we want to merge all of the normal cues into a single cue to ensure they are drawn
+          // correctly (i.e. don't overlap) and to emulate roll-up, but only if there are multiple
+          // normal cues, otherwise we can just append the single normal cue
+          if (firstNormalCue == null) {
+            firstNormalCue = cue;
+          } else if (normalCueTextBuilder == null) {
+            normalCueTextBuilder = new SpannableStringBuilder();
+            normalCueTextBuilder
+                .append(Assertions.checkNotNull(firstNormalCue.text))
+                .append("\n")
+                .append(Assertions.checkNotNull(cue.text));
+          } else {
+            normalCueTextBuilder.append("\n").append(Assertions.checkNotNull(cue.text));
+          }
+        } else {
+          list.add(cue);
+        }
+      }
+    }
+    if (normalCueTextBuilder != null) {
+      // there were multiple normal cues, so create a new cue with all of the text
+      list.add(new WebvttCue.Builder().setText(normalCueTextBuilder).build());
+    } else if (firstNormalCue != null) {
+      // there was only a single normal cue, so just add it to the list
+      list.add(firstNormalCue);
+    }
+    return list;
+  }
+
+}