[Cast] Size-Adaptable platform video encoders.

media/cast/sender/video_encoder_impl.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_CAST_SENDER_VIDEO_ENCODER_IMPL_H_
 #define MEDIA_CAST_SENDER_VIDEO_ENCODER_IMPL_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "media/cast/cast_config.h"
 #include "media/cast/cast_environment.h"
@@ skipping 11 matching lines @@
  public:
   struct CodecDynamicConfig {
     bool key_frame_requested;
     uint32 latest_frame_id_to_reference;
     int bit_rate;
   };
 
   typedef base::Callback<void(scoped_ptr<EncodedFrame>)>
       FrameEncodedCallback;
 
+  // Returns true if VideoEncoderImpl can be used with the given |video_config|.
+  static bool IsSupported(const VideoSenderConfig& video_config);
+
   VideoEncoderImpl(scoped_refptr<CastEnvironment> cast_environment,
                    const VideoSenderConfig& video_config,
                    const StatusChangeCallback& status_change_cb);
 
   ~VideoEncoderImpl() override;
 
   // VideoEncoder implementation.
-  bool CanEncodeVariedFrameSizes() const override;
   bool EncodeVideoFrame(
       const scoped_refptr<media::VideoFrame>& video_frame,
       const base::TimeTicks& reference_time,
       const FrameEncodedCallback& frame_encoded_callback) override;
   void SetBitRate(int new_bit_rate) override;
   void GenerateKeyFrame() override;
   void LatestFrameIdToReference(uint32 frame_id) override;
 
  private:
   scoped_refptr<CastEnvironment> cast_environment_;
   CodecDynamicConfig dynamic_config_;
 
   // This member belongs to the video encoder thread. It must not be
   // dereferenced on the main thread. We manage the lifetime of this member
   // manually because it needs to be initialize, used and destroyed on the
   // video encoder thread and video encoder thread can out-live the main thread.
   scoped_ptr<SoftwareVideoEncoder> encoder_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoEncoderImpl);
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_SENDER_VIDEO_ENCODER_IMPL_H_