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 107 matching lines @@
   // three, and so on.
   // The VideoEncoder may redistribute bitrates over the temporal layers so a
   // bitrate threshold of 100k and an estimate of 105k does not imply that we
   // get 100k in one temporal layer and 5k in the other, just that the bitrate
   // in the first temporal layer should not exceed 100k.
   // TODO(kthelgason): Apart from a special case for two-layer screencast these
   // thresholds are not propagated to the VideoEncoder. To be implemented.
   std::vector<int> temporal_layer_thresholds_bps;
 };
 
-struct VideoEncoderConfig {
+class VideoEncoderConfig {
  public:
   // These are reference counted to permit copying VideoEncoderConfig and be
   // kept alive until all encoder_specific_settings go out of scope.
   // TODO(kthelgason): Consider removing the need for copying VideoEncoderConfig
   // and use rtc::Optional for encoder_specific_settings instead.
   class EncoderSpecificSettings : public rtc::RefCountInterface {
    public:
     // TODO(pbos): Remove FillEncoderSpecificSettings as soon as VideoCodec is
     // not in use and encoder implementations ask for codec-specific structs
     // directly.
     void FillEncoderSpecificSettings(VideoCodec* codec_struct) const;
 
     virtual void FillVideoCodecVp8(VideoCodecVP8* vp8_settings) const;
     virtual void FillVideoCodecVp9(VideoCodecVP9* vp9_settings) const;
     virtual void FillVideoCodecH264(VideoCodecH264* h264_settings) const;
    private:
     virtual ~EncoderSpecificSettings() {}
-    friend struct VideoEncoderConfig;
+    friend class VideoEncoderConfig;
   };
 
   class H264EncoderSpecificSettings : public EncoderSpecificSettings {
    public:
     explicit H264EncoderSpecificSettings(const VideoCodecH264& specifics);
-    virtual void FillVideoCodecH264(
-        VideoCodecH264* h264_settings) const override;
+    void FillVideoCodecH264(VideoCodecH264* h264_settings) const override;
 
    private:
     VideoCodecH264 specifics_;
   };
 
   class Vp8EncoderSpecificSettings : public EncoderSpecificSettings {
    public:
     explicit Vp8EncoderSpecificSettings(const VideoCodecVP8& specifics);
-    virtual void FillVideoCodecVp8(VideoCodecVP8* vp8_settings) const override;
+    void FillVideoCodecVp8(VideoCodecVP8* vp8_settings) const override;
 
    private:
     VideoCodecVP8 specifics_;
   };
 
   class Vp9EncoderSpecificSettings : public EncoderSpecificSettings {
    public:
     explicit Vp9EncoderSpecificSettings(const VideoCodecVP9& specifics);
-    virtual void FillVideoCodecVp9(VideoCodecVP9* vp9_settings) const override;
+    void FillVideoCodecVp9(VideoCodecVP9* vp9_settings) const override;
 
    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> video_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_