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      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
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_RENDERER_MEDIA_MEDIA_STREAM_SOURCE_H_
      6 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_SOURCE_H_
      7 
      8 #include "base/callback.h"
      9 #include "base/compiler_specific.h"
     10 #include "base/logging.h"
     11 #include "content/common/content_export.h"
     12 #include "content/common/media/media_stream_options.h"
     13 #include "third_party/WebKit/public/platform/WebMediaStreamSource.h"
     14 
     15 namespace blink {
     16 class WebMediaStreamTrack;
     17 }  // namespace blink
     18 
     19 namespace content {
     20 
     21 class CONTENT_EXPORT MediaStreamSource
     22     : NON_EXPORTED_BASE(public blink::WebMediaStreamSource::ExtraData) {
     23  public:
     24   typedef base::Callback<void(const blink::WebMediaStreamSource& source)>
     25       SourceStoppedCallback;
     26 
     27   typedef base::Callback<void(MediaStreamSource* source,
     28                               MediaStreamRequestResult result,
     29                               const blink::WebString& result_name)>
     30       ConstraintsCallback;
     31 
     32   // Source constraints key for
     33   // http://dev.w3.org/2011/webrtc/editor/getusermedia.html.
     34   static const char kSourceId[];
     35 
     36   MediaStreamSource();
     37   virtual ~MediaStreamSource();
     38 
     39   // Returns device information about a source that has been created by a
     40   // JavaScript call to GetUserMedia, e.g., a camera or microphone.
     41   const StreamDeviceInfo& device_info() const {
     42     return device_info_;
     43   }
     44 
     45   // Stops the source (by calling DoStopSource()). This sets the
     46   // WebMediaStreamSource::readyState to ended, triggers the |stop_callback_|
     47   // if set. All pointers to this object are invalid after calling this.
     48   void StopSource();
     49 
     50   void ResetSourceStoppedCallback() {
     51     DCHECK(!stop_callback_.is_null());
     52     stop_callback_.Reset();
     53   }
     54 
     55  protected:
     56   // Called when StopSource is called. It allows derived classes to implement
     57   // its  own Stop method.
     58   virtual void DoStopSource() = 0;
     59 
     60   // Sets device information about a source that has been created by a
     61   // JavaScript call to GetUserMedia. F.E a camera or microphone.
     62   void SetDeviceInfo(const StreamDeviceInfo& device_info) {
     63     device_info_ = device_info;
     64   }
     65 
     66   // Sets a callback that will be triggered when StopSource is called.
     67   void SetStopCallback(const SourceStoppedCallback& stop_callback) {
     68     DCHECK(stop_callback_.is_null());
     69     stop_callback_ = stop_callback;
     70   }
     71 
     72  private:
     73   StreamDeviceInfo device_info_;
     74   SourceStoppedCallback stop_callback_;
     75 
     76   DISALLOW_COPY_AND_ASSIGN(MediaStreamSource);
     77 };
     78 
     79 }  // namespace content
     80 
     81 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_SOURCE_H_
     82