Media Galleries API Metadata: SafeMediaMetadataParser and IPCTunnelDataReader.

chrome/utility/media_galleries/ipc_tunnel_data_source.h

+// Copyright 2013 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 CHROME_UTILITY_MEDIA_GALLERIES_IPC_TUNNEL_DATA_SOURCE_H_
+#define CHROME_UTILITY_MEDIA_GALLERIES_IPC_TUNNEL_DATA_SOURCE_H_
+
+#include <map>
+
+#include "media/base/data_source.h"
+
+namespace metadata {
+
+// Provides the metadata parser with bytes from the browser process via IPC.
+class IPCTunnelDataSource : public media::DataSource {

[vandebo (ex-Chrome), 2014/01/07 18:34:59]

IPCDataSource is probably a sufficient name.

[tommycli, 2014/01/07 20:23:31]

Done.

+ public:
+  explicit IPCTunnelDataSource(int64 total_size);
+  virtual ~IPCTunnelDataSource();
+
+  // Implementation of DataSource.
+  virtual void set_host(media::DataSourceHost* host) OVERRIDE;
+  virtual void Stop(const base::Closure& callback) OVERRIDE;
+  virtual void Read(int64 position, int size, uint8* data,
+                    const ReadCB& read_cb) OVERRIDE;
+  virtual bool GetSize(int64* size_out) OVERRIDE;
+  virtual bool IsStreaming() OVERRIDE;
+  virtual void SetBitrate(int bitrate) OVERRIDE;
+
+  // Called by ChromeContentUtilityClient when it recieves the requested bytes.
+  void ReceiveBytes(int64 request_id, const std::string& bytes);
+
+ private:
+  struct Request {
+    Request();
+    ~Request();
+    uint8* destination;
+    ReadCB callback;
+  };
+
+  int64 total_size_;
+  std::map<int64, Request> pending_requests_;
+  int64 next_request_id_;
+};
+
+}  // namespace metadata
+
+#endif  // CHROME_UTILITY_MEDIA_GALLERIES_IPC_TUNNEL_DATA_SOURCE_H_