1 files changed, 81 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/ts/UserDataReader.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/ts/UserDataReader.java
new file mode 100644
index 0000000000..fb56fe379c
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/ts/UserDataReader.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2018 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.extractor.ts;
+
+import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.Format;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.extractor.ExtractorOutput;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.extractor.TrackOutput;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.text.cea.CeaUtil;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Assertions;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.util.MimeTypes;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.util.ParsableByteArray;
+import java.util.List;
+
+/** Consumes user data, outputting contained CEA-608/708 messages to a {@link TrackOutput}. */
+/* package */ final class UserDataReader {
+
+  private static final int USER_DATA_START_CODE = 0x0001B2;
+
+  private final List<Format> closedCaptionFormats;
+  private final TrackOutput[] outputs;
+
+  public UserDataReader(List<Format> closedCaptionFormats) {
+    this.closedCaptionFormats = closedCaptionFormats;
+    outputs = new TrackOutput[closedCaptionFormats.size()];
+  }
+
+  public void createTracks(
+      ExtractorOutput extractorOutput, TsPayloadReader.TrackIdGenerator idGenerator) {
+    for (int i = 0; i < outputs.length; i++) {
+      idGenerator.generateNewId();
+      TrackOutput output = extractorOutput.track(idGenerator.getTrackId(), C.TRACK_TYPE_TEXT);
+      Format channelFormat = closedCaptionFormats.get(i);
+      String channelMimeType = channelFormat.sampleMimeType;
+      Assertions.checkArgument(
+          MimeTypes.APPLICATION_CEA608.equals(channelMimeType)
+              || MimeTypes.APPLICATION_CEA708.equals(channelMimeType),
+          "Invalid closed caption mime type provided: " + channelMimeType);
+      output.format(
+          Format.createTextSampleFormat(
+              idGenerator.getFormatId(),
+              channelMimeType,
+              /* codecs= */ null,
+              /* bitrate= */ Format.NO_VALUE,
+              channelFormat.selectionFlags,
+              channelFormat.language,
+              channelFormat.accessibilityChannel,
+              /* drmInitData= */ null,
+              Format.OFFSET_SAMPLE_RELATIVE,
+              channelFormat.initializationData));
+      outputs[i] = output;
+    }
+  }
+
+  public void consume(long pesTimeUs, ParsableByteArray userDataPayload) {
+    if (userDataPayload.bytesLeft() < 9) {
+      return;
+    }
+    int userDataStartCode = userDataPayload.readInt();
+    int userDataIdentifier = userDataPayload.readInt();
+    int userDataTypeCode = userDataPayload.readUnsignedByte();
+    if (userDataStartCode == USER_DATA_START_CODE
+        && userDataIdentifier == CeaUtil.USER_DATA_IDENTIFIER_GA94
+        && userDataTypeCode == CeaUtil.USER_DATA_TYPE_CODE_MPEG_CC) {
+      CeaUtil.consumeCcData(pesTimeUs, userDataPayload, outputs);
+    }
+  }
+}