blob: 6fb3b76a58645e56687e15b4b74ee0a786e9da9b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
// Copyright 2014 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_DATA_SOURCE_H_
#define CHROME_UTILITY_MEDIA_GALLERIES_IPC_DATA_SOURCE_H_
#include <map>
#include <string>
#include "base/memory/ref_counted.h"
#include "base/threading/thread_checker.h"
#include "chrome/utility/utility_message_handler.h"
#include "media/base/data_source.h"
namespace base {
class TaskRunner;
}
namespace metadata {
// Provides the metadata parser with bytes from the browser process via IPC.
// Class must be created and destroyed on the utility thread. Class may be used
// as a DataSource on a different thread. The utility thread must not be blocked
// for read operations to succeed.
class IPCDataSource: public media::DataSource,
public UtilityMessageHandler {
public:
// May only be called on the utility thread.
explicit IPCDataSource(int64 total_size);
virtual ~IPCDataSource();
// Implementation of DataSource. These methods may be called on any single
// thread. First usage of these methods attaches a thread checker.
virtual void Stop() 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;
// Implementation of UtilityMessageHandler. May only be called on the utility
// thread.
virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
private:
struct Request {
Request();
~Request();
uint8* destination;
ReadCB callback;
};
void ReadOnUtilityThread(int64 position, int size, uint8* data,
const ReadCB& read_cb);
void OnRequestBlobBytesFinished(int64 request_id,
const std::string& bytes);
const int64 total_size_;
scoped_refptr<base::TaskRunner> utility_task_runner_;
std::map<int64, Request> pending_requests_;
int64 next_request_id_;
base::ThreadChecker utility_thread_checker_;
// Enforces that the DataSource methods are called on one other thread only.
base::ThreadChecker data_source_thread_checker_;
};
} // namespace metadata
#endif // CHROME_UTILITY_MEDIA_GALLERIES_IPC_DATA_SOURCE_H_
|
