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
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
// 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 MEDIA_CAST_CAST_ENVIRONMENT_H_
#define MEDIA_CAST_CAST_ENVIRONMENT_H_
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/single_thread_task_runner.h"
#include "base/time/tick_clock.h"
#include "base/time/time.h"
#include "media/cast/logging/logging_defines.h"
#include "media/cast/logging/logging_impl.h"
namespace media {
namespace cast {
class CastEnvironment : public base::RefCountedThreadSafe<CastEnvironment> {
public:
// An enumeration of the cast threads.
enum ThreadId {
// The main thread is where the cast system is configured and where timers
// and network IO is performed.
MAIN,
// The audio encoder thread is where all send side audio processing is done,
// primarily encoding but also re-sampling.
AUDIO_ENCODER,
// The audio decoder thread is where all receive side audio processing is
// done, primarily decoding but also error concealment and re-sampling.
AUDIO_DECODER,
// The video encoder thread is where the video encode processing is done.
VIDEO_ENCODER,
// The video decoder thread is where the video decode processing is done.
VIDEO_DECODER,
// The transport thread is where the transport processing is done.
TRANSPORT,
};
CastEnvironment(
scoped_ptr<base::TickClock> clock,
scoped_refptr<base::SingleThreadTaskRunner> main_thread_proxy,
scoped_refptr<base::SingleThreadTaskRunner> audio_encode_thread_proxy,
scoped_refptr<base::SingleThreadTaskRunner> audio_decode_thread_proxy,
scoped_refptr<base::SingleThreadTaskRunner> video_encode_thread_proxy,
scoped_refptr<base::SingleThreadTaskRunner> video_decode_thread_proxy,
scoped_refptr<base::SingleThreadTaskRunner> transport_thread_proxy,
const CastLoggingConfig& logging_config);
// These are the same methods in message_loop.h, but are guaranteed to either
// get posted to the MessageLoop if it's still alive, or be deleted otherwise.
// They return true iff the thread existed and the task was posted. Note that
// even if the task is posted, there's no guarantee that it will run, since
// the target thread may already have a Quit message in its queue.
bool PostTask(ThreadId identifier,
const tracked_objects::Location& from_here,
const base::Closure& task);
bool PostDelayedTask(ThreadId identifier,
const tracked_objects::Location& from_here,
const base::Closure& task,
base::TimeDelta delay);
bool CurrentlyOn(ThreadId identifier);
// All of the media::cast implementation must use this TickClock.
base::TickClock* Clock() const { return clock_.get(); }
// Logging is not thread safe. Its methods should always be called from the
// main thread.
LoggingImpl* Logging() const { return logging_.get(); }
scoped_refptr<base::SingleThreadTaskRunner> GetTaskRunner(
ThreadId identifier) const;
bool HasAudioEncoderThread() {
return audio_encode_thread_proxy_ ? true : false;
}
bool HasVideoEncoderThread() {
return video_encode_thread_proxy_ ? true : false;
}
protected:
virtual ~CastEnvironment();
// Subclasses may override these.
scoped_refptr<base::SingleThreadTaskRunner> main_thread_proxy_;
scoped_refptr<base::SingleThreadTaskRunner> audio_encode_thread_proxy_;
scoped_refptr<base::SingleThreadTaskRunner> audio_decode_thread_proxy_;
scoped_refptr<base::SingleThreadTaskRunner> video_encode_thread_proxy_;
scoped_refptr<base::SingleThreadTaskRunner> video_decode_thread_proxy_;
scoped_refptr<base::SingleThreadTaskRunner> transport_thread_proxy_;
private:
friend class base::RefCountedThreadSafe<CastEnvironment>;
scoped_ptr<base::TickClock> clock_;
scoped_ptr<LoggingImpl> logging_;
DISALLOW_COPY_AND_ASSIGN(CastEnvironment);
};
} // namespace cast
} // namespace media
#endif // MEDIA_CAST_CAST_ENVIRONMENT_H_
|
