OLD | NEW |
---|---|
1 // Copyright 2014 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_SOURCE_H_ | 5 #ifndef CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_SOURCE_H_ |
6 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_SOURCE_H_ | 6 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_SOURCE_H_ |
7 | 7 |
8 #include <string> | |
9 #include <vector> | |
10 | |
8 #include "base/compiler_specific.h" | 11 #include "base/compiler_specific.h" |
9 #include "base/macros.h" | 12 #include "base/macros.h" |
10 #include "base/memory/scoped_ptr.h" | 13 #include "base/memory/scoped_ptr.h" |
11 #include "base/memory/weak_ptr.h" | 14 #include "base/memory/weak_ptr.h" |
15 #include "base/synchronization/lock.h" | |
16 #include "base/threading/thread_checker.h" | |
12 #include "content/common/content_export.h" | 17 #include "content/common/content_export.h" |
13 #include "content/renderer/media/media_stream_source.h" | 18 #include "content/renderer/media/media_stream_source.h" |
14 #include "content/renderer/media/webaudio_capturer_source.h" | 19 #include "media/audio/audio_parameters.h" |
15 #include "content/renderer/media/webrtc/peer_connection_dependency_factory.h" | 20 #include "third_party/WebKit/public/platform/WebMediaStreamSource.h" |
16 #include "content/renderer/media/webrtc_audio_capturer.h" | 21 #include "third_party/WebKit/public/platform/WebMediaStreamTrack.h" |
17 #include "third_party/webrtc/api/mediastreaminterface.h" | |
18 | 22 |
19 namespace content { | 23 namespace content { |
20 | 24 |
21 class MediaStreamAudioTrack; | 25 class MediaStreamAudioTrack; |
22 | 26 |
23 // TODO(miu): In a soon-upcoming set of refactoring changes, this class will | 27 // Represents a source of audio, and manages the delivery of audio data between |
24 // become a base class for managing tracks (part of what WebRtcAudioCapturer | 28 // the source implementation and one or more MediaStreamAudioTracks. This is |
25 // does today). Then, the rest of WebRtcAudioCapturer will be rolled into a | 29 // a base class providing all the necessary functionality to connect tracks and |
26 // subclass. http://crbug.com/577874 | 30 // have audio data delivered to them. Subclasses provide the actual audio |
31 // source implementation (e.g., media::AudioCapturerSource), and should | |
32 // implement the DoStopSource() and EnsureSourceIsStarted() methods, and call | |
33 // DeliverDataToTracks(). | |
34 // | |
35 // This base class can be instantiated, to be used as a place-holder or a "null" | |
36 // source of audio. This can be useful for unit testing, wherever a mock is | |
37 // needed, and/or calls to DeliverDataToTracks() must be made at very specific | |
38 // times. | |
39 // | |
40 // An instance of this class is owned by blink::WebMediaStreamSource. | |
41 // | |
42 // Usage example: | |
43 // | |
44 // class MyAudioSource : public MediaStreamSource { ... }; | |
45 // | |
46 // blink::WebMediaStreamSource blink_source = ...; | |
47 // blink::WebMediaStreamTrack blink_track = ...; | |
48 // blink_source.setExtraData(new MyAudioSource()); // Takes ownership. | |
49 // if (MediaStreamAudioSource::From(blink_source) | |
50 // ->ConnectToTrack(blink_track)) { | |
51 // LOG(INFO) << "Success!"; | |
52 // } else { | |
53 // LOG(ERROR) << "Failed!"; | |
54 // } | |
27 class CONTENT_EXPORT MediaStreamAudioSource | 55 class CONTENT_EXPORT MediaStreamAudioSource |
28 : NON_EXPORTED_BASE(public MediaStreamSource) { | 56 : NON_EXPORTED_BASE(public MediaStreamSource) { |
29 public: | 57 public: |
30 MediaStreamAudioSource(int render_frame_id, | 58 explicit MediaStreamAudioSource(bool is_local_source); |
31 const StreamDeviceInfo& device_info, | |
32 const SourceStoppedCallback& stop_callback, | |
33 PeerConnectionDependencyFactory* factory); | |
34 MediaStreamAudioSource(); | |
35 ~MediaStreamAudioSource() override; | 59 ~MediaStreamAudioSource() override; |
36 | 60 |
37 // Returns the MediaStreamAudioSource instance owned by the given blink | 61 // Returns the MediaStreamAudioSource instance owned by the given blink |
38 // |source| or null. | 62 // |source| or null. |
39 static MediaStreamAudioSource* From(const blink::WebMediaStreamSource& track); | 63 static MediaStreamAudioSource* From( |
64 const blink::WebMediaStreamSource& source); | |
40 | 65 |
41 void AddTrack(const blink::WebMediaStreamTrack& track, | 66 // Provides a weak reference to this MediaStreamAudioSource. The weak |
42 const blink::WebMediaConstraints& constraints, | 67 // pointer may only be dereferenced on the main thread. |
43 const ConstraintsCallback& callback); | |
44 | |
45 base::WeakPtr<MediaStreamAudioSource> GetWeakPtr() { | 68 base::WeakPtr<MediaStreamAudioSource> GetWeakPtr() { |
46 return weak_factory_.GetWeakPtr(); | 69 return weak_factory_.GetWeakPtr(); |
47 } | 70 } |
48 | 71 |
72 // Returns true if the source of audio is local to the application (e.g., | |
73 // microphone input or loopback audio capture) as opposed to audio being | |
74 // streamed-in from outside the application. | |
75 bool is_local_source() const { return is_local_source_; } | |
76 | |
77 // Connects this source to the given |track|, creating the appropriate | |
78 // implementation of the content::MediaStreamAudioTrack interface, which | |
79 // becomes associated with and owned by |track|. | |
80 // | |
81 // Returns true if the source was successfully started and the | |
82 // MediaStreamAudioTrack assigned to |track.extraData()|. | |
83 bool ConnectToTrack(const blink::WebMediaStreamTrack& track); | |
84 | |
85 // Returns the current format of the audio passing through this source to the | |
86 // sinks. This can return invalid parameters if the source has not yet been | |
87 // started. This method is thread-safe. | |
88 media::AudioParameters GetAudioParameters() const; | |
89 | |
90 // Returns a unique class identifier. Some subclasses override and use this | |
91 // method to provide safe down-casting to their type. | |
92 virtual void* GetClassIdentifier() const; | |
93 | |
94 protected: | |
o1ka
2016/03/30 15:00:57
Readability side note: We've got here overrides, v
miu
2016/03/31 04:57:59
I've tried, but I simply don't understand any part
o1ka
2016/03/31 16:35:35
Sorry, I meant it would be nice to have the protec
| |
95 // Returns a new MediaStreamAudioTrack. |id| is the blink track's ID in | |
96 // UTF-8. Subclasses may override this to provide an extended implementation. | |
97 virtual scoped_ptr<MediaStreamAudioTrack> CreateMediaStreamAudioTrack( | |
98 const std::string& id); | |
99 | |
100 // Default "no-op" MediaStreamAudioSource implementation that just sets | |
101 // |is_stopped_| to true. Subclasses should override this method. | |
102 void DoStopSource() override; | |
103 | |
104 // Returns true if the source has already been started and has not yet been | |
105 // stopped. Otherwise, attempts to start the source and returns true if | |
106 // successful. Subclasses should override this method. | |
107 virtual bool EnsureSourceIsStarted(); | |
108 | |
109 // Called by subclasses to update the format of the audio passing through this | |
110 // source to the sinks. This may be called at any time, before or after | |
111 // tracks have been connected; but must be called at least once before | |
112 // DeliverDataToTracks(). This method is thread-safe. | |
113 void SetFormat(const media::AudioParameters& params); | |
114 | |
115 // Called by subclasses to deliver audio data to the currently-connected | |
116 // tracks. This method is thread-safe. | |
117 void DeliverDataToTracks(const media::AudioBus& audio_bus, | |
118 base::TimeTicks reference_time); | |
119 | |
120 // Set to true by DoStopSource() once the source has been permanently | |
121 // stopped and no further calls to DeliverDataToTracks() will be made. | |
122 // Subclasses that override DoStopSource() must set this. | |
123 bool is_stopped_; | |
o1ka
2016/03/30 15:00:57
I think this needs to be private. The reason: now
miu
2016/03/31 04:57:59
Done.
| |
124 | |
125 // In debug builds, check that all methods that could cause object graph | |
126 // or data flow changes are being called on the main thread. | |
127 base::ThreadChecker thread_checker_; | |
o1ka
2016/03/30 15:00:57
I think each class in the hierarchy should have it
miu
2016/03/31 04:57:59
Done.
| |
128 | |
129 private: | |
130 // Instantiates the appropriate MediaStreamAudioTrack implementation and sets | |
131 // it as |track|'s extraData. This is called by ConnectToTrack() after all | |
132 // preconditions have been met: 1) A prior call to EnsureSourceIsStarted() | |
133 // returned true; 2) |track| does not already hold a MediaStreamAudioTrack | |
134 // instance. | |
135 void ConnectStartedSourceToTrack(const blink::WebMediaStreamTrack& track); | |
136 | |
49 // Removes |track| from the list of instances that get a copy of the source | 137 // Removes |track| from the list of instances that get a copy of the source |
50 // audio data. | 138 // audio data. The "stop callback" that was provided to the track calls |
139 // this. | |
51 void StopAudioDeliveryTo(MediaStreamAudioTrack* track); | 140 void StopAudioDeliveryTo(MediaStreamAudioTrack* track); |
52 | 141 |
53 WebRtcAudioCapturer* audio_capturer() const { return audio_capturer_.get(); } | 142 // True if the source of audio is a local device. False if the source is |
143 // remote (e.g., streamed-in from a server). | |
144 const bool is_local_source_; | |
54 | 145 |
55 void SetAudioCapturer(scoped_ptr<WebRtcAudioCapturer> capturer) { | 146 // Protects concurrent access to |params_| and |tracks_|. |
56 DCHECK(!audio_capturer_.get()); | 147 mutable base::Lock lock_; |
57 audio_capturer_ = std::move(capturer); | |
58 } | |
59 | 148 |
60 webrtc::AudioSourceInterface* local_audio_source() { | 149 // Specifies the current format of the audio passing through the pipeline. |
61 return local_audio_source_.get(); | 150 media::AudioParameters params_; |
62 } | |
63 | 151 |
64 void SetLocalAudioSource(scoped_refptr<webrtc::AudioSourceInterface> source) { | 152 // List of currently-connected MediaStreamAudioTracks. While |
65 local_audio_source_ = std::move(source); | 153 // MediaStreamAudioSource creates these instances, blink::WebMediaStreamTrack |
66 } | 154 // instances own the objects. |
67 | 155 std::vector<MediaStreamAudioTrack*> tracks_; |
68 WebAudioCapturerSource* webaudio_capturer() const { | |
69 return webaudio_capturer_.get(); | |
70 } | |
71 | |
72 void SetWebAudioCapturer(scoped_ptr<WebAudioCapturerSource> capturer) { | |
73 DCHECK(!webaudio_capturer_.get()); | |
74 webaudio_capturer_ = std::move(capturer); | |
75 } | |
76 | |
77 protected: | |
78 void DoStopSource() override; | |
79 | |
80 private: | |
81 const int render_frame_id_; | |
82 PeerConnectionDependencyFactory* const factory_; | |
83 | |
84 // MediaStreamAudioSource is the owner of either a WebRtcAudioCapturer or a | |
85 // WebAudioCapturerSource. | |
86 // | |
87 // TODO(miu): In a series of soon-upcoming changes, WebRtcAudioCapturer and | |
88 // WebAudioCapturerSource will become subclasses of MediaStreamAudioSource | |
89 // instead. | |
90 scoped_ptr<WebRtcAudioCapturer> audio_capturer_; | |
91 scoped_ptr<WebAudioCapturerSource> webaudio_capturer_; | |
92 | |
93 // This member holds an instance of webrtc::LocalAudioSource. This is used | |
94 // as a container for audio options. | |
95 scoped_refptr<webrtc::AudioSourceInterface> local_audio_source_; | |
96 | 156 |
97 // Provides weak pointers so that MediaStreamAudioTracks won't call | 157 // Provides weak pointers so that MediaStreamAudioTracks won't call |
98 // StopAudioDeliveryTo() if this instance dies first. | 158 // StopAudioDeliveryTo() if this instance dies first. |
99 base::WeakPtrFactory<MediaStreamAudioSource> weak_factory_; | 159 base::WeakPtrFactory<MediaStreamAudioSource> weak_factory_; |
100 | 160 |
101 DISALLOW_COPY_AND_ASSIGN(MediaStreamAudioSource); | 161 DISALLOW_COPY_AND_ASSIGN(MediaStreamAudioSource); |
102 }; | 162 }; |
103 | 163 |
104 } // namespace content | 164 } // namespace content |
105 | 165 |
106 #endif // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_SOURCE_H_ | 166 #endif // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_SOURCE_H_ |
OLD | NEW |