media: Add MemoryDataSource.

media/filters/memory_data_source.h

Index: media/filters/memory_data_source.h
diff --git a/media/filters/memory_data_source.h b/media/filters/memory_data_source.h
new file mode 100644
index 0000000000000000000000000000000000000000..012b4bbf2a2b1e5881a06a6eacfabc86964afd8b
--- /dev/null
+++ b/media/filters/memory_data_source.h
@@ -0,0 +1,45 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MEDIA_FILTERS_MEMORY_DATA_SOURCE_H_
+#define MEDIA_FILTERS_MEMORY_DATA_SOURCE_H_
+
+#include <stdint.h>
+
+#include "base/macros.h"
+#include "media/base/data_source.h"
+
+namespace media {
+
+// Basic data source that treats the URL as a file path, and uses the file
+// system to read data for a media pipeline.
+class MEDIA_EXPORT MemoryDataSource : public DataSource {
+ public:
+  // Construct MemoryDataSource with |data| and |size|. The data is guaranteed
+  // to be valid during the lifetime of MemoryDataSource.
+  MemoryDataSource(const uint8_t* data, size_t size);
+  ~MemoryDataSource() final;
+
+  // Implementation of DataSource.
+  void Read(int64_t position,
+            int size,
+            uint8_t* data,
+            const DataSource::ReadCB& read_cb) final;
+  void Stop() final;
+  bool GetSize(int64_t* size_out) final;
+  bool IsStreaming() final;
+  void SetBitrate(int bitrate) final;
+
+ private:
+  const uint8_t* data_ = nullptr;
+  size_t size_ = 0;
+
+  bool is_stopped_ = false;
+
+  DISALLOW_COPY_AND_ASSIGN(MemoryDataSource);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_FILTERS_MEMORY_DATA_SOURCE_H_