Move usage of QualityScaler to ViEEncoder.

webrtc/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.
  */
 
 #ifndef WEBRTC_VIDEO_ENCODER_H_
 #define WEBRTC_VIDEO_ENCODER_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "webrtc/base/checks.h"
 #include "webrtc/common_types.h"
 #include "webrtc/typedefs.h"
 #include "webrtc/video_frame.h"
+#include "webrtc/base/optional.h"
 
 namespace webrtc {
 
 class RTPFragmentationHeader;
 // TODO(pbos): Expose these through a public (root) header or change these APIs.
 struct CodecSpecificInfo;
 class VideoCodec;
 
 class EncodedImageCallback {
  public:
@@ skipping 20 matching lines @@
 
     // Tells the encoder that the next frame is should be dropped.
     bool drop_next_frame = false;
   };
 
   // Callback function which is called when an image has been encoded.
   virtual Result OnEncodedImage(
       const EncodedImage& encoded_image,
       const CodecSpecificInfo* codec_specific_info,
       const RTPFragmentationHeader* fragmentation) = 0;
+
+  virtual void OnDroppedFrame() {}
 };
 
 class VideoEncoder {
  public:
+  enum EncoderType {
+    kH264,
+    kVp8,
+    kVp9,
+    kUnsupportedCodec,
+  };
+  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)
+        : enabled(on),
+          thresholds(rtc::Optional<QpThresholds>(QpThresholds(low, high))) {}
+    explicit ScalingSettings(bool on) : enabled(on) {}
+    const bool enabled;
+    const rtc::Optional<QpThresholds> thresholds;
+  };
+  static VideoEncoder* Create(EncoderType codec_type);
+  // Returns true if this type of encoder can be created using
+  // VideoEncoder::Create.
+  static bool IsSupportedSoftware(EncoderType codec_type);
+  static EncoderType CodecToEncoderType(VideoCodecType codec_type);
+
   static VideoCodecVP8 GetDefaultVp8Settings();
   static VideoCodecVP9 GetDefaultVp9Settings();
   static VideoCodecH264 GetDefaultH264Settings();
 
   virtual ~VideoEncoder() {}
 
   // Initialize the encoder with the information from the codecSettings
   //
   // Input:
   //          - codec_settings    : Codec settings
@@ skipping 65 matching lines @@
     return -1;
   }
 
   // Default fallback: Just use the sum of bitrates as the single target rate.
   // TODO(sprang): Remove this default implementation when we remove SetRates().
   virtual int32_t SetRateAllocation(const BitrateAllocation& allocation,
                                     uint32_t framerate) {
     return SetRates(allocation.get_sum_kbps(), framerate);
   }
 
+  // Any encoder implementation wishing to use the WebRTC provided
+  // quality scaler must implement this method.
+  virtual ScalingSettings GetScalingSettings() const {
+    return ScalingSettings(false);
+  }
+
   virtual int32_t SetPeriodicKeyFrames(bool enable) { return -1; }
-  virtual void OnDroppedFrame() {}
   virtual bool SupportsNativeHandle() const { return false; }
   virtual const char* ImplementationName() const { return "unknown"; }
 };
 
 }  // namespace webrtc
 #endif  // WEBRTC_VIDEO_ENCODER_H_