Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 101 insertions, 0 deletions

diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/text/webvtt/Mp4WebvttDecoder.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/text/webvtt/Mp4WebvttDecoder.java
new file mode 100644
index 0000000000..3df35c789b
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/text/webvtt/Mp4WebvttDecoder.java
@@ -0,0 +1,101 @@
+/*
+ * 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 org.mozilla.thirdparty.com.google.android.exoplayer2.text.Cue;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.text.SimpleSubtitleDecoder;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.text.Subtitle;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.text.SubtitleDecoderException;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.util.ParsableByteArray;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Util;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+/** A {@link SimpleSubtitleDecoder} for Webvtt embedded in a Mp4 container file. */
+@SuppressWarnings("ConstantField")
+public final class Mp4WebvttDecoder extends SimpleSubtitleDecoder {
+
+  private static final int BOX_HEADER_SIZE = 8;
+
+  @SuppressWarnings("ConstantCaseForConstants")
+  private static final int TYPE_payl = 0x7061796c;
+
+  @SuppressWarnings("ConstantCaseForConstants")
+  private static final int TYPE_sttg = 0x73747467;
+
+  @SuppressWarnings("ConstantCaseForConstants")
+  private static final int TYPE_vttc = 0x76747463;
+
+  private final ParsableByteArray sampleData;
+  private final WebvttCue.Builder builder;
+
+  public Mp4WebvttDecoder() {
+    super("Mp4WebvttDecoder");
+    sampleData = new ParsableByteArray();
+    builder = new WebvttCue.Builder();
+  }
+
+  @Override
+  protected Subtitle decode(byte[] bytes, int length, boolean reset)
+      throws SubtitleDecoderException {
+    // Webvtt in Mp4 samples have boxes inside of them, so we have to do a traditional box parsing:
+    // first 4 bytes size and then 4 bytes type.
+    sampleData.reset(bytes, length);
+    List<Cue> resultingCueList = new ArrayList<>();
+    while (sampleData.bytesLeft() > 0) {
+      if (sampleData.bytesLeft() < BOX_HEADER_SIZE) {
+        throw new SubtitleDecoderException("Incomplete Mp4Webvtt Top Level box header found.");
+      }
+      int boxSize = sampleData.readInt();
+      int boxType = sampleData.readInt();
+      if (boxType == TYPE_vttc) {
+        resultingCueList.add(parseVttCueBox(sampleData, builder, boxSize - BOX_HEADER_SIZE));
+      } else {
+        // Peers of the VTTCueBox are still not supported and are skipped.
+        sampleData.skipBytes(boxSize - BOX_HEADER_SIZE);
+      }
+    }
+    return new Mp4WebvttSubtitle(resultingCueList);
+  }
+
+  private static Cue parseVttCueBox(ParsableByteArray sampleData, WebvttCue.Builder builder,
+        int remainingCueBoxBytes) throws SubtitleDecoderException {
+    builder.reset();
+    while (remainingCueBoxBytes > 0) {
+      if (remainingCueBoxBytes < BOX_HEADER_SIZE) {
+        throw new SubtitleDecoderException("Incomplete vtt cue box header found.");
+      }
+      int boxSize = sampleData.readInt();
+      int boxType = sampleData.readInt();
+      remainingCueBoxBytes -= BOX_HEADER_SIZE;
+      int payloadLength = boxSize - BOX_HEADER_SIZE;
+      String boxPayload =
+          Util.fromUtf8Bytes(sampleData.data, sampleData.getPosition(), payloadLength);
+      sampleData.skipBytes(payloadLength);
+      remainingCueBoxBytes -= payloadLength;
+      if (boxType == TYPE_sttg) {
+        WebvttCueParser.parseCueSettingsList(boxPayload, builder);
+      } else if (boxType == TYPE_payl) {
+        WebvttCueParser.parseCueText(null, boxPayload.trim(), builder, Collections.emptyList());
+      } else {
+        // Other VTTCueBox children are still not supported and are ignored.
+      }
+    }
+    return builder.build();
+  }
+
+}