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      1 /*
      2  * Copyright (C) 2012 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef WebMediaStreamCenter_h
     32 #define WebMediaStreamCenter_h
     33 
     34 #include "WebVector.h"
     35 
     36 namespace blink {
     37 
     38 class WebAudioSourceProvider;
     39 class WebMediaStream;
     40 class WebMediaStreamTrack;
     41 class WebMediaStreamTrackSourcesRequest;
     42 class WebSourceInfo;
     43 class WebString;
     44 
     45 class WebMediaStreamCenter {
     46 public:
     47     virtual ~WebMediaStreamCenter() { }
     48 
     49     virtual bool getMediaStreamTrackSources(const WebMediaStreamTrackSourcesRequest&)= 0;
     50 
     51     // Stream functionality.
     52     virtual void didCreateMediaStream(WebMediaStream&) = 0;
     53     virtual bool didAddMediaStreamTrack(const WebMediaStream&, const WebMediaStreamTrack&) = 0;
     54     virtual bool didRemoveMediaStreamTrack(const WebMediaStream&, const WebMediaStreamTrack&) = 0;
     55     virtual void didStopLocalMediaStream(const WebMediaStream&) = 0;
     56 
     57     // Track functionality.
     58     virtual void didCreateMediaStreamTrack(const WebMediaStreamTrack&) { }
     59     virtual void didEnableMediaStreamTrack(const WebMediaStreamTrack&) { }
     60     virtual void didDisableMediaStreamTrack(const WebMediaStreamTrack&) { }
     61     virtual bool didStopMediaStreamTrack(const WebMediaStreamTrack&) { return false; }
     62 
     63     // Caller must take the ownership of the returned |WebAudioSourceProvider| object.
     64     virtual WebAudioSourceProvider* createWebAudioSourceFromMediaStreamTrack(const WebMediaStreamTrack&) { return 0; }
     65 };
     66 
     67 } // namespace blink
     68 
     69 #endif // WebMediaStreamCenter_h
     70 
     71