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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" | |
12 #include "content/common/content_export.h" | 16 #include "content/common/content_export.h" |
13 #include "content/renderer/media/media_stream_source.h" | 17 #include "content/renderer/media/media_stream_source.h" |
14 #include "content/renderer/media/webaudio_capturer_source.h" | 18 #include "media/audio/audio_parameters.h" |
15 #include "content/renderer/media/webrtc/peer_connection_dependency_factory.h" | 19 #include "third_party/WebKit/public/platform/WebMediaStreamSource.h" |
16 #include "content/renderer/media/webrtc_audio_capturer.h" | 20 #include "third_party/WebKit/public/platform/WebMediaStreamTrack.h" |
17 #include "third_party/webrtc/api/mediastreaminterface.h" | |
18 | 21 |
19 namespace content { | 22 namespace content { |
20 | 23 |
21 class MediaStreamAudioTrack; | 24 class MediaStreamAudioTrack; |
22 | 25 |
23 // TODO(miu): In a soon-upcoming set of refactoring changes, this class will | 26 // 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 | 27 // the source implementation and one or more MediaStreamAudioTracks. This is |
25 // does today). Then, the rest of WebRtcAudioCapturer will be rolled into a | 28 // a base class providing all the necessary functionality to connect tracks and |
26 // subclass. http://crbug.com/577874 | 29 // have audio data delivered to them. Subclasses provide the actual audio |
30 // source implementation (e.g., media::AudioCapturerSource), and should | |
31 // implement the DoStopSource() and EnsureSourceIsStarted() methods, and call | |
perkj_chrome
2016/04/08 14:05:41
How does DoStopSource and EnsureSourceStoped relat
miu
2016/04/19 00:40:22
Whoops. I needed to update this comment. The int
| |
32 // DeliverDataToTracks(). | |
33 // | |
34 // This base class can be instantiated, to be used as a place-holder or a "null" | |
35 // source of audio. This can be useful for unit testing, wherever a mock is | |
36 // needed, and/or calls to DeliverDataToTracks() must be made at very specific | |
37 // times. | |
38 // | |
39 // An instance of this class is owned by blink::WebMediaStreamSource. | |
40 // | |
41 // Usage example: | |
42 // | |
43 // class MyAudioSource : public MediaStreamSource { ... }; | |
44 // | |
45 // blink::WebMediaStreamSource blink_source = ...; | |
46 // blink::WebMediaStreamTrack blink_track = ...; | |
47 // blink_source.setExtraData(new MyAudioSource()); // Takes ownership. | |
48 // if (MediaStreamAudioSource::From(blink_source) | |
49 // ->ConnectToTrack(blink_track)) { | |
perkj_chrome
2016/04/08 14:05:41
For video- the tracks register and deregister with
miu
2016/04/19 00:40:22
I looked into this a bit. IMO, it would be better
perkj_chrome
2016/04/20 13:34:53
Ok- we should try to get video to behave the same
miu
2016/04/20 22:04:52
Done. https://bugs.chromium.org/p/chromium/issues
| |
50 // LOG(INFO) << "Success!"; | |
51 // } else { | |
52 // LOG(ERROR) << "Failed!"; | |
53 // } | |
27 class CONTENT_EXPORT MediaStreamAudioSource | 54 class CONTENT_EXPORT MediaStreamAudioSource |
28 : NON_EXPORTED_BASE(public MediaStreamSource) { | 55 : NON_EXPORTED_BASE(public MediaStreamSource) { |
29 public: | 56 public: |
30 MediaStreamAudioSource(int render_frame_id, | 57 explicit MediaStreamAudioSource(bool is_local_source); |
31 const StreamDeviceInfo& device_info, | |
32 const SourceStoppedCallback& stop_callback, | |
33 PeerConnectionDependencyFactory* factory); | |
34 MediaStreamAudioSource(); | |
35 ~MediaStreamAudioSource() override; | 58 ~MediaStreamAudioSource() override; |
36 | 59 |
37 // Returns the MediaStreamAudioSource instance owned by the given blink | 60 // Returns the MediaStreamAudioSource instance owned by the given blink |
38 // |source| or null. | 61 // |source| or null. |
39 static MediaStreamAudioSource* From(const blink::WebMediaStreamSource& track); | 62 static MediaStreamAudioSource* From( |
63 const blink::WebMediaStreamSource& source); | |
40 | 64 |
41 void AddTrack(const blink::WebMediaStreamTrack& track, | 65 // Provides a weak reference to this MediaStreamAudioSource. The weak |
42 const blink::WebMediaConstraints& constraints, | 66 // pointer may only be dereferenced on the main thread. |
43 const ConstraintsCallback& callback); | |
44 | |
45 base::WeakPtr<MediaStreamAudioSource> GetWeakPtr() { | 67 base::WeakPtr<MediaStreamAudioSource> GetWeakPtr() { |
46 return weak_factory_.GetWeakPtr(); | 68 return weak_factory_.GetWeakPtr(); |
47 } | 69 } |
48 | 70 |
71 // Returns true if the source of audio is local to the application (e.g., | |
72 // microphone input or loopback audio capture) as opposed to audio being | |
73 // streamed-in from outside the application. | |
74 bool is_local_source() const { return is_local_source_; } | |
75 | |
76 // Connects this source to the given |track|, creating the appropriate | |
77 // implementation of the content::MediaStreamAudioTrack interface, which | |
78 // becomes associated with and owned by |track|. | |
79 // | |
80 // Returns true if the source was successfully started and the | |
81 // MediaStreamAudioTrack assigned to |track.extraData()|. | |
82 bool ConnectToTrack(const blink::WebMediaStreamTrack& track); | |
83 | |
84 // Returns the current format of the audio passing through this source to the | |
85 // sinks. This can return invalid parameters if the source has not yet been | |
86 // started. This method is thread-safe. | |
87 media::AudioParameters GetAudioParameters() const; | |
88 | |
89 // Returns a unique class identifier. Some subclasses override and use this | |
90 // method to provide safe down-casting to their type. | |
91 virtual void* GetClassIdentifier() const; | |
92 | |
93 protected: | |
94 // Returns a new MediaStreamAudioTrack. |id| is the blink track's ID in | |
95 // UTF-8. Subclasses may override this to provide an extended implementation. | |
96 virtual scoped_ptr<MediaStreamAudioTrack> CreateMediaStreamAudioTrack( | |
97 const std::string& id); | |
98 | |
99 // Returns true if the source has already been started and has not yet been | |
100 // stopped. Otherwise, attempts to start the source and returns true if | |
101 // successful. While a the source is running, it may provide audio on any | |
perkj_chrome
2016/04/08 14:05:41
nit: While a the /s While the...
miu
2016/04/19 00:40:22
Good catch. Done.
| |
102 // thread by calling DeliverDataToTracks(). | |
103 // | |
104 // A default no-op implementation is provided in this base class. Subclasses | |
105 // should override this method. | |
106 virtual bool EnsureSourceIsStarted(); | |
107 | |
108 // Stops the source and guarantees the the flow of audio data has stopped | |
109 // (i.e., by the time this method returns, there will be no further calls to | |
110 // DeliverDataToTracks() on any thread). | |
111 // | |
112 // A default no-op implementation is provided in this base class. Subclasses | |
113 // should override this method. | |
114 virtual void EnsureSourceIsStopped(); | |
115 | |
116 // Called by subclasses to update the format of the audio passing through this | |
117 // source to the sinks. This may be called at any time, before or after | |
118 // tracks have been connected; but must be called at least once before | |
119 // DeliverDataToTracks(). This method is thread-safe. | |
120 void SetFormat(const media::AudioParameters& params); | |
121 | |
122 // Called by subclasses to deliver audio data to the currently-connected | |
123 // tracks. This method is thread-safe. | |
124 void DeliverDataToTracks(const media::AudioBus& audio_bus, | |
125 base::TimeTicks reference_time); | |
126 | |
127 private: | |
128 // MediaStreamSource override. | |
129 void DoStopSource() override; | |
130 | |
131 // Instantiates the appropriate MediaStreamAudioTrack implementation and sets | |
132 // it as |track|'s extraData. This is called by ConnectToTrack() after all | |
133 // preconditions have been met: 1) A prior call to EnsureSourceIsStarted() | |
134 // returned true; 2) |track| does not already hold a MediaStreamAudioTrack | |
135 // instance. | |
136 void ConnectStartedSourceToTrack(const blink::WebMediaStreamTrack& track); | |
137 | |
49 // Removes |track| from the list of instances that get a copy of the source | 138 // Removes |track| from the list of instances that get a copy of the source |
50 // audio data. | 139 // audio data. The "stop callback" that was provided to the track calls |
140 // this. | |
51 void StopAudioDeliveryTo(MediaStreamAudioTrack* track); | 141 void StopAudioDeliveryTo(MediaStreamAudioTrack* track); |
52 | 142 |
53 WebRtcAudioCapturer* audio_capturer() const { return audio_capturer_.get(); } | 143 // True if the source of audio is a local device. False if the source is |
144 // remote (e.g., streamed-in from a server). | |
145 const bool is_local_source_; | |
54 | 146 |
55 void SetAudioCapturer(scoped_ptr<WebRtcAudioCapturer> capturer) { | 147 // In debug builds, check that all methods that could cause object graph |
56 DCHECK(!audio_capturer_.get()); | 148 // or data flow changes are being called on the main thread. |
57 audio_capturer_ = std::move(capturer); | 149 base::ThreadChecker thread_checker_; |
58 } | |
59 | 150 |
60 webrtc::AudioSourceInterface* local_audio_source() { | 151 // Set to true once this source has been permanently stopped. |
61 return local_audio_source_.get(); | 152 bool is_stopped_; |
62 } | |
63 | 153 |
64 void SetLocalAudioSource(scoped_refptr<webrtc::AudioSourceInterface> source) { | 154 // Protects concurrent access to |params_| and |tracks_|. |
65 local_audio_source_ = std::move(source); | 155 mutable base::Lock lock_; |
66 } | |
67 | 156 |
68 WebAudioCapturerSource* webaudio_capturer() const { | 157 // Specifies the current format of the audio passing through the pipeline. |
69 return webaudio_capturer_.get(); | 158 media::AudioParameters params_; |
70 } | |
71 | 159 |
72 void SetWebAudioCapturer(scoped_ptr<WebAudioCapturerSource> capturer) { | 160 // List of currently-connected MediaStreamAudioTracks. While |
73 DCHECK(!webaudio_capturer_.get()); | 161 // MediaStreamAudioSource creates these instances, blink::WebMediaStreamTrack |
74 webaudio_capturer_ = std::move(capturer); | 162 // instances own the objects. |
75 } | 163 std::vector<MediaStreamAudioTrack*> tracks_; |
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 | 164 |
97 // Provides weak pointers so that MediaStreamAudioTracks won't call | 165 // Provides weak pointers so that MediaStreamAudioTracks won't call |
perkj_chrome
2016/04/08 14:05:41
Good but I think its safe regardless- a blink trac
miu
2016/04/19 00:40:22
Ack. Discussed in reply to your comment above.
perkj_chrome
2016/04/20 13:34:53
Acknowledged.
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98 // StopAudioDeliveryTo() if this instance dies first. | 166 // StopAudioDeliveryTo() if this instance dies first. |
99 base::WeakPtrFactory<MediaStreamAudioSource> weak_factory_; | 167 base::WeakPtrFactory<MediaStreamAudioSource> weak_factory_; |
100 | 168 |
101 DISALLOW_COPY_AND_ASSIGN(MediaStreamAudioSource); | 169 DISALLOW_COPY_AND_ASSIGN(MediaStreamAudioSource); |
102 }; | 170 }; |
103 | 171 |
104 } // namespace content | 172 } // namespace content |
105 | 173 |
106 #endif // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_SOURCE_H_ | 174 #endif // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_SOURCE_H_ |
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