chrome/utility/media_galleries/ipc_data_source.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_UTILITY_MEDIA_GALLERIES_IPC_DATA_SOURCE_H_
   6 #define CHROME_UTILITY_MEDIA_GALLERIES_IPC_DATA_SOURCE_H_
   7
   8 #include <map>
   9 #include <string>
  10
  11 #include "chrome/utility/utility_message_handler.h"
  12 #include "media/base/data_source.h"
  13
  14 namespace metadata {
  15
  16 // Provides the metadata parser with bytes from the browser process via IPC.
  17 class IPCDataSource: public media::DataSource,
  18                      public chrome::UtilityMessageHandler {
  19  public:
  20   explicit IPCDataSource(int64 total_size);
  21   virtual ~IPCDataSource();
  22
  23   // Implementation of DataSource.
  24   virtual void set_host(media::DataSourceHost* host) OVERRIDE;
  25   virtual void Stop(const base::Closure& callback) OVERRIDE;
  26   virtual void Read(int64 position, int size, uint8* data,
  27                     const ReadCB& read_cb) OVERRIDE;
  28   virtual bool GetSize(int64* size_out) OVERRIDE;
  29   virtual bool IsStreaming() OVERRIDE;
  30   virtual void SetBitrate(int bitrate) OVERRIDE;
  31
  32   // Implementation of UtilityMessageHandler.
  33   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
  34
  35  private:
  36   struct Request {
  37     Request();
  38     ~Request();
  39     uint8* destination;
  40     ReadCB callback;
  41   };
  42
  43   void OnRequestBlobBytesFinished(int64 request_id,
  44                                   const std::string& bytes);
  45
  46   const int64 total_size_;
  47   std::map<int64, Request> pending_requests_;
  48   int64 next_request_id_;
  49 };
  50
  51 }  // namespace metadata
  52
  53 #endif  // CHROME_UTILITY_MEDIA_GALLERIES_IPC_DATA_SOURCE_H_