Let ViEEncoder handle resolution changes.

webrtc/config.h

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 161 matching lines @@
 
    private:
     VideoCodecVP9 specifics_;
   };
 
   enum class ContentType {
     kRealtimeVideo,
     kScreen,
   };
 
+  class VideoStreamFactoryInterface : public rtc::RefCountInterface {
+   public:
+    // An implementation should return a std::vector<VideoStream> with the
+    // wanted VideoStream settings for the given video resolution.
+    // The size of the vector may not be larger than
+    // |encoder_config.number_of_streams|.
+    virtual std::vector<VideoStream> CreateEncoderStreams(
+        int width,
+        int height,
+        const VideoEncoderConfig& encoder_config) = 0;
+
+   protected:
+    virtual ~VideoStreamFactoryInterface() {}
+  };
+
   VideoEncoderConfig& operator=(VideoEncoderConfig&&) = default;
   VideoEncoderConfig& operator=(const VideoEncoderConfig&) = delete;
 
   // Mostly used by tests.  Avoid creating copies if you can.
   VideoEncoderConfig Copy() const { return VideoEncoderConfig(*this); }
 
   VideoEncoderConfig();
   VideoEncoderConfig(VideoEncoderConfig&&) = default;
   ~VideoEncoderConfig();
   std::string ToString() const;
 
-  std::vector<VideoStream> streams;
+  rtc::scoped_refptr<VideoStreamFactoryInterface> encoder_stream_factory;
   std::vector<SpatialLayer> spatial_layers;
   ContentType content_type;
   rtc::scoped_refptr<const EncoderSpecificSettings> encoder_specific_settings;
 
   // Padding will be used up to this bitrate regardless of the bitrate produced
   // by the encoder. Padding above what's actually produced by the encoder helps
   // maintaining a higher bitrate estimate. Padding will however not be sent
   // unless the estimated bandwidth indicates that the link can handle it.
   int min_transmit_bitrate_bps;
-  bool expect_encode_from_texture;
+  int max_bitrate_bps;
+
+  // Max number of encoded VideoStreams to produce.
+  size_t number_of_streams;
 
  private:
   // Access to the copy constructor is private to force use of the Copy()
   // method for those exceptional cases where we do use it.
   VideoEncoderConfig(const VideoEncoderConfig&) = default;
 };
 
 struct VideoDecoderH264Settings {
   std::string sprop_parameter_sets;
 };
 
 class DecoderSpecificSettings {
  public:
   virtual ~DecoderSpecificSettings() {}
   rtc::Optional<VideoDecoderH264Settings> h264_extra_settings;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_CONFIG_H_