1 files changed, 113 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/StatsDataSource.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/StatsDataSource.java
new file mode 100644
index 0000000000..e2a179cc9d
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/StatsDataSource.java
@@ -0,0 +1,113 @@
+/*
+ * 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.upstream;
+
+import android.net.Uri;
+import androidx.annotation.Nullable;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Assertions;
+import java.io.IOException;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * {@link DataSource} wrapper which keeps track of bytes transferred, redirected uris, and response
+ * headers.
+ */
+public final class StatsDataSource implements DataSource {
+
+  private final DataSource dataSource;
+
+  private long bytesRead;
+  private Uri lastOpenedUri;
+  private Map<String, List<String>> lastResponseHeaders;
+
+  /**
+   * Creates the stats data source.
+   *
+   * @param dataSource The wrapped {@link DataSource}.
+   */
+  public StatsDataSource(DataSource dataSource) {
+    this.dataSource = Assertions.checkNotNull(dataSource);
+    lastOpenedUri = Uri.EMPTY;
+    lastResponseHeaders = Collections.emptyMap();
+  }
+
+  /** Resets the number of bytes read as returned from {@link #getBytesRead()} to zero. */
+  public void resetBytesRead() {
+    bytesRead = 0;
+  }
+
+  /** Returns the total number of bytes that have been read from the data source. */
+  public long getBytesRead() {
+    return bytesRead;
+  }
+
+  /**
+   * Returns the {@link Uri} associated with the last {@link #open(DataSpec)} call. If redirection
+   * occurred, this is the redirected uri.
+   */
+  public Uri getLastOpenedUri() {
+    return lastOpenedUri;
+  }
+
+  /** Returns the response headers associated with the last {@link #open(DataSpec)} call. */
+  public Map<String, List<String>> getLastResponseHeaders() {
+    return lastResponseHeaders;
+  }
+
+  @Override
+  public void addTransferListener(TransferListener transferListener) {
+    dataSource.addTransferListener(transferListener);
+  }
+
+  @Override
+  public long open(DataSpec dataSpec) throws IOException {
+    // Reassign defaults in case dataSource.open throws an exception.
+    lastOpenedUri = dataSpec.uri;
+    lastResponseHeaders = Collections.emptyMap();
+    long availableBytes = dataSource.open(dataSpec);
+    lastOpenedUri = Assertions.checkNotNull(getUri());
+    lastResponseHeaders = getResponseHeaders();
+    return availableBytes;
+  }
+
+  @Override
+  public int read(byte[] buffer, int offset, int readLength) throws IOException {
+    int bytesRead = dataSource.read(buffer, offset, readLength);
+    if (bytesRead != C.RESULT_END_OF_INPUT) {
+      this.bytesRead += bytesRead;
+    }
+    return bytesRead;
+  }
+
+  @Override
+  @Nullable
+  public Uri getUri() {
+    return dataSource.getUri();
+  }
+
+  @Override
+  public Map<String, List<String>> getResponseHeaders() {
+    return dataSource.getResponseHeaders();
+  }
+
+  @Override
+  public void close() throws IOException {
+    dataSource.close();
+  }
+}