ipc_data_source.h revision 5d1f7b1de12d16ceb2c938c56701a3e8bfa558f7 
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
14namespace metadata {
15
16// Provides the metadata parser with bytes from the browser process via IPC.
17class 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_
54