1 files changed, 119 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/source/chunk/DataChunk.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/source/chunk/DataChunk.java
new file mode 100644
index 0000000000..583f8ceeee
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/source/chunk/DataChunk.java
@@ -0,0 +1,119 @@
+/*
+ * 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.source.chunk;
+
+import androidx.annotation.Nullable;
+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.upstream.DataSource;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.DataSpec;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Util;
+import java.io.IOException;
+import java.util.Arrays;
+
+/**
+ * A base class for {@link Chunk} implementations where the data should be loaded into a
+ * {@code byte[]} before being consumed.
+ */
+public abstract class DataChunk extends Chunk {
+
+  private static final int READ_GRANULARITY = 16 * 1024;
+
+  private byte[] data;
+
+  private volatile boolean loadCanceled;
+
+  /**
+   * @param dataSource The source from which the data should be loaded.
+   * @param dataSpec Defines the data to be loaded.
+   * @param type See {@link #type}.
+   * @param trackFormat See {@link #trackFormat}.
+   * @param trackSelectionReason See {@link #trackSelectionReason}.
+   * @param trackSelectionData See {@link #trackSelectionData}.
+   * @param data An optional recycled array that can be used as a holder for the data.
+   */
+  public DataChunk(
+      DataSource dataSource,
+      DataSpec dataSpec,
+      int type,
+      Format trackFormat,
+      int trackSelectionReason,
+      @Nullable Object trackSelectionData,
+      byte[] data) {
+    super(dataSource, dataSpec, type, trackFormat, trackSelectionReason, trackSelectionData,
+        C.TIME_UNSET, C.TIME_UNSET);
+    this.data = data;
+  }
+
+  /**
+   * Returns the array in which the data is held.
+   * <p>
+   * This method should be used for recycling the holder only, and not for reading the data.
+   *
+   * @return The array in which the data is held.
+   */
+  public byte[] getDataHolder() {
+    return data;
+  }
+
+  // Loadable implementation
+
+  @Override
+  public final void cancelLoad() {
+    loadCanceled = true;
+  }
+
+  @Override
+  public final void load() throws IOException, InterruptedException {
+    try {
+      dataSource.open(dataSpec);
+      int limit = 0;
+      int bytesRead = 0;
+      while (bytesRead != C.RESULT_END_OF_INPUT && !loadCanceled) {
+        maybeExpandData(limit);
+        bytesRead = dataSource.read(data, limit, READ_GRANULARITY);
+        if (bytesRead != -1) {
+          limit += bytesRead;
+        }
+      }
+      if (!loadCanceled) {
+        consume(data, limit);
+      }
+    } finally {
+      Util.closeQuietly(dataSource);
+    }
+  }
+
+  /**
+   * Called by {@link #load()}. Implementations should override this method to consume the loaded
+   * data.
+   *
+   * @param data An array containing the data.
+   * @param limit The limit of the data.
+   * @throws IOException If an error occurs consuming the loaded data.
+   */
+  protected abstract void consume(byte[] data, int limit) throws IOException;
+
+  private void maybeExpandData(int limit) {
+    if (data == null) {
+      data = new byte[READ_GRANULARITY];
+    } else if (data.length < limit + READ_GRANULARITY) {
+      // The new length is calculated as (data.length + READ_GRANULARITY) rather than
+      // (limit + READ_GRANULARITY) in order to avoid small increments in the length.
+      data = Arrays.copyOf(data, data.length + READ_GRANULARITY);
+    }
+  }
+}