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      1 /*
      2  * libjingle
      3  * Copyright 2013, Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #ifndef TALK_MEDIA_WEBRTC_WEBRTCVIDEOENCODERFACTORY_H_
     29 #define TALK_MEDIA_WEBRTC_WEBRTCVIDEOENCODERFACTORY_H_
     30 
     31 #include "talk/base/refcount.h"
     32 #include "talk/media/base/codec.h"
     33 #include "webrtc/common_types.h"
     34 
     35 namespace webrtc {
     36 class VideoEncoder;
     37 }
     38 
     39 namespace cricket {
     40 
     41 class WebRtcVideoEncoderFactory {
     42  public:
     43   struct VideoCodec {
     44     webrtc::VideoCodecType type;
     45     std::string name;
     46     int max_width;
     47     int max_height;
     48     int max_fps;
     49 
     50     VideoCodec(webrtc::VideoCodecType t, const std::string& nm, int w, int h,
     51                int fr)
     52         : type(t), name(nm), max_width(w), max_height(h), max_fps(fr) {
     53     }
     54   };
     55 
     56   class Observer {
     57    public:
     58     // Invoked when the list of supported codecs becomes available.
     59     // This will not be invoked if the list of codecs is already available when
     60     // the factory is installed. Otherwise this will be invoked only once if the
     61     // list of codecs is not yet available when the factory is installed.
     62     virtual void OnCodecsAvailable() = 0;
     63 
     64    protected:
     65     virtual ~Observer() {}
     66   };
     67 
     68   // Caller takes the ownership of the returned object and it should be released
     69   // by calling DestroyVideoEncoder().
     70   virtual webrtc::VideoEncoder* CreateVideoEncoder(
     71       webrtc::VideoCodecType type) = 0;
     72   virtual ~WebRtcVideoEncoderFactory() {}
     73 
     74   // Adds/removes observer to receive OnCodecsChanged notifications.
     75   // Factory must outlive Observer. Observer is responsible for removing itself
     76   // from the Factory by the time its dtor is done.
     77   virtual void AddObserver(Observer* observer) = 0;
     78   virtual void RemoveObserver(Observer* observer) = 0;
     79 
     80   // Returns a list of supported codecs in order of preference.
     81   // The list is empty if the list of codecs is not yet available.
     82   virtual const std::vector<VideoCodec>& codecs() const = 0;
     83 
     84   virtual void DestroyVideoEncoder(webrtc::VideoEncoder* encoder) = 0;
     85 };
     86 
     87 }  // namespace cricket
     88 
     89 #endif  // TALK_MEDIA_WEBRTC_WEBRTCVIDEOENCODERFACTORY_H_
     90