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28 // This file contains interfaces for MediaStream, MediaTrack and MediaSource.
29 // These interfaces are used for implementing MediaStream and MediaTrack as
30 // defined in http://dev.w3.org/2011/webrtc/editor/webrtc.html#stream-api. These
31 // interfaces must be used only with PeerConnection. PeerConnectionManager
32 // interface provides the factory methods to create MediaStream and MediaTracks.
34 #ifndef TALK_APP_WEBRTC_MEDIASTREAMINTERFACE_H_
35 #define TALK_APP_WEBRTC_MEDIASTREAMINTERFACE_H_
40 #include "talk/base/basictypes.h"
41 #include "talk/base/refcount.h"
42 #include "talk/base/scoped_ref_ptr.h"
51 } // namespace cricket
55 // Generic observer interface.
56 class ObserverInterface {
58 virtual void OnChanged() = 0;
61 virtual ~ObserverInterface() {}
64 class NotifierInterface {
66 virtual void RegisterObserver(ObserverInterface* observer) = 0;
67 virtual void UnregisterObserver(ObserverInterface* observer) = 0;
69 virtual ~NotifierInterface() {}
72 // Base class for sources. A MediaStreamTrack have an underlying source that
73 // provide media. A source can be shared with multiple tracks.
74 // TODO(perkj): Implement sources for local and remote audio tracks and
75 // remote video tracks.
76 class MediaSourceInterface : public talk_base::RefCountInterface,
77 public NotifierInterface {
86 virtual SourceState state() const = 0;
89 virtual ~MediaSourceInterface() {}
92 // Information about a track.
93 class MediaStreamTrackInterface : public talk_base::RefCountInterface,
94 public NotifierInterface {
97 kInitializing, // Track is beeing negotiated.
98 kLive = 1, // Track alive
99 kEnded = 2, // Track have ended
100 kFailed = 3, // Track negotiation failed.
103 virtual std::string kind() const = 0;
104 virtual std::string id() const = 0;
105 virtual bool enabled() const = 0;
106 virtual TrackState state() const = 0;
107 virtual bool set_enabled(bool enable) = 0;
108 // These methods should be called by implementation only.
109 virtual bool set_state(TrackState new_state) = 0;
112 virtual ~MediaStreamTrackInterface() {}
115 // Interface for rendering VideoFrames from a VideoTrack
116 class VideoRendererInterface {
118 virtual void SetSize(int width, int height) = 0;
119 virtual void RenderFrame(const cricket::VideoFrame* frame) = 0;
122 // The destructor is protected to prevent deletion via the interface.
123 // This is so that we allow reference counted classes, where the destructor
124 // should never be public, to implement the interface.
125 virtual ~VideoRendererInterface() {}
128 class VideoSourceInterface;
130 class VideoTrackInterface : public MediaStreamTrackInterface {
132 // Register a renderer that will render all frames received on this track.
133 virtual void AddRenderer(VideoRendererInterface* renderer) = 0;
134 // Deregister a renderer.
135 virtual void RemoveRenderer(VideoRendererInterface* renderer) = 0;
137 virtual VideoSourceInterface* GetSource() const = 0;
140 virtual ~VideoTrackInterface() {}
143 // AudioSourceInterface is a reference counted source used for AudioTracks.
144 // The same source can be used in multiple AudioTracks.
145 class AudioSourceInterface : public MediaSourceInterface {
147 class AudioObserver {
149 virtual void OnSetVolume(double volume) = 0;
152 virtual ~AudioObserver() {}
155 // TODO(xians): Makes all the interface pure virtual after Chrome has their
157 // Sets the volume to the source. |volume| is in the range of [0, 10].
158 virtual void SetVolume(double volume) {}
160 // Registers/unregisters observer to the audio source.
161 virtual void RegisterAudioObserver(AudioObserver* observer) {}
162 virtual void UnregisterAudioObserver(AudioObserver* observer) {}
165 // Interface for receiving audio data from a AudioTrack.
166 class AudioTrackSinkInterface {
168 virtual void OnData(const void* audio_data,
171 int number_of_channels,
172 int number_of_frames) = 0;
174 virtual ~AudioTrackSinkInterface() {}
177 class AudioTrackInterface : public MediaStreamTrackInterface {
179 // TODO(xians): Figure out if the following interface should be const or not.
180 virtual AudioSourceInterface* GetSource() const = 0;
182 // Adds/Removes a sink that will receive the audio data from the track.
183 // TODO(xians): Make them pure virtual after Chrome implements these
185 virtual void AddSink(AudioTrackSinkInterface* sink) {}
186 virtual void RemoveSink(AudioTrackSinkInterface* sink) {}
188 // Gets a pointer to the audio renderer of this AudioTrack.
189 // The pointer is valid for the lifetime of this AudioTrack.
190 // TODO(xians): Remove the following interface after Chrome switches to
191 // AddSink() and RemoveSink() interfaces.
192 virtual cricket::AudioRenderer* GetRenderer() { return NULL; }
195 virtual ~AudioTrackInterface() {}
198 typedef std::vector<talk_base::scoped_refptr<AudioTrackInterface> >
200 typedef std::vector<talk_base::scoped_refptr<VideoTrackInterface> >
203 class MediaStreamInterface : public talk_base::RefCountInterface,
204 public NotifierInterface {
206 virtual std::string label() const = 0;
208 virtual AudioTrackVector GetAudioTracks() = 0;
209 virtual VideoTrackVector GetVideoTracks() = 0;
210 virtual talk_base::scoped_refptr<AudioTrackInterface>
211 FindAudioTrack(const std::string& track_id) = 0;
212 virtual talk_base::scoped_refptr<VideoTrackInterface>
213 FindVideoTrack(const std::string& track_id) = 0;
215 virtual bool AddTrack(AudioTrackInterface* track) = 0;
216 virtual bool AddTrack(VideoTrackInterface* track) = 0;
217 virtual bool RemoveTrack(AudioTrackInterface* track) = 0;
218 virtual bool RemoveTrack(VideoTrackInterface* track) = 0;
221 virtual ~MediaStreamInterface() {}
224 } // namespace webrtc
226 #endif // TALK_APP_WEBRTC_MEDIASTREAMINTERFACE_H_