Move kMinPixelsPerFrame constant in VideoStreamEncoder to VideoEncoder::ScalingSettings.

webrtc/api/video_codecs/video_encoder.h

 /*
  *  Copyright (c) 2014 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 57 matching lines @@
 class VideoEncoder {
  public:
   struct QpThresholds {
     QpThresholds(int l, int h) : low(l), high(h) {}
     QpThresholds() : low(-1), high(-1) {}
     int low;
     int high;
   };
   struct ScalingSettings {
     ScalingSettings(bool on, int low, int high);
+    ScalingSettings(bool on, int low, int high, int min_pixels);
+    ScalingSettings(bool on, int min_pixels);
     explicit ScalingSettings(bool on);
     ScalingSettings(const ScalingSettings&);
     ~ScalingSettings();
 
     const bool enabled;
     const rtc::Optional<QpThresholds> thresholds;
+
+    // We will never ask for a resolution lower than this.
+    // TODO(kthelgason): Lower this limit when better testing
+    // on MediaCodec and fallback implementations are in place.
+    // See https://bugs.chromium.org/p/webrtc/issues/detail?id=7206
+    const int min_pixels_per_frame = 320 * 180;
   };
 
   static VideoCodecVP8 GetDefaultVp8Settings();
   static VideoCodecVP9 GetDefaultVp9Settings();
   static VideoCodecH264 GetDefaultH264Settings();
 
   virtual ~VideoEncoder() {}
 
   // Initialize the encoder with the information from the codecSettings
   //
@@ skipping 72 matching lines @@
   // Any encoder implementation wishing to use the WebRTC provided
   // quality scaler must implement this method.
   virtual ScalingSettings GetScalingSettings() const;
 
   virtual int32_t SetPeriodicKeyFrames(bool enable);
   virtual bool SupportsNativeHandle() const;
   virtual const char* ImplementationName() const;
 };
 }  // namespace webrtc
 #endif  // WEBRTC_API_VIDEO_CODECS_VIDEO_ENCODER_H_