1 files changed, 83 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/text/ssa/SsaDialogueFormat.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/text/ssa/SsaDialogueFormat.java
new file mode 100644
index 0000000000..312c779e23
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/text/ssa/SsaDialogueFormat.java
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2019 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.ssa;
+
+import static org.mozilla.thirdparty.com.google.android.exoplayer2.text.ssa.SsaDecoder.FORMAT_LINE_PREFIX;
+
+import android.text.TextUtils;
+import androidx.annotation.Nullable;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Assertions;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Util;
+
+/**
+ * Represents a {@code Format:} line from the {@code [Events]} section
+ *
+ * <p>The indices are used to determine the location of particular properties in each {@code
+ * Dialogue:} line.
+ */
+/* package */ final class SsaDialogueFormat {
+
+  public final int startTimeIndex;
+  public final int endTimeIndex;
+  public final int styleIndex;
+  public final int textIndex;
+  public final int length;
+
+  private SsaDialogueFormat(
+      int startTimeIndex, int endTimeIndex, int styleIndex, int textIndex, int length) {
+    this.startTimeIndex = startTimeIndex;
+    this.endTimeIndex = endTimeIndex;
+    this.styleIndex = styleIndex;
+    this.textIndex = textIndex;
+    this.length = length;
+  }
+
+  /**
+   * Parses the format info from a 'Format:' line in the [Events] section.
+   *
+   * @return the parsed info, or null if {@code formatLine} doesn't contain both 'start' and 'end'.
+   */
+  @Nullable
+  public static SsaDialogueFormat fromFormatLine(String formatLine) {
+    int startTimeIndex = C.INDEX_UNSET;
+    int endTimeIndex = C.INDEX_UNSET;
+    int styleIndex = C.INDEX_UNSET;
+    int textIndex = C.INDEX_UNSET;
+    Assertions.checkArgument(formatLine.startsWith(FORMAT_LINE_PREFIX));
+    String[] keys = TextUtils.split(formatLine.substring(FORMAT_LINE_PREFIX.length()), ",");
+    for (int i = 0; i < keys.length; i++) {
+      switch (Util.toLowerInvariant(keys[i].trim())) {
+        case "start":
+          startTimeIndex = i;
+          break;
+        case "end":
+          endTimeIndex = i;
+          break;
+        case "style":
+          styleIndex = i;
+          break;
+        case "text":
+          textIndex = i;
+          break;
+      }
+    }
+    return (startTimeIndex != C.INDEX_UNSET && endTimeIndex != C.INDEX_UNSET)
+        ? new SsaDialogueFormat(startTimeIndex, endTimeIndex, styleIndex, textIndex, keys.length)
+        : null;
+  }
+}