In screenshare mode, suppress VP8 bitrate overshoot and increase quality

webrtc/modules/video_coding/codecs/vp8/default_temporal_layers.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.
 */
 /*
 * This file defines classes for doing temporal layers with VP8.
 */
 #ifndef WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_DEFAULT_TEMPORAL_LAYERS_H_
 #define WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_DEFAULT_TEMPORAL_LAYERS_H_
 
 #include "webrtc/modules/video_coding/codecs/vp8/temporal_layers.h"
 
 namespace webrtc {
 
 class DefaultTemporalLayers : public TemporalLayers {
  public:
   DefaultTemporalLayers(int number_of_temporal_layers,
                         uint8_t initial_tl0_pic_idx);
   virtual ~DefaultTemporalLayers() {}
 
   // Returns the recommended VP8 encode flags needed. May refresh the decoder
   // and/or update the reference buffers.
-  virtual int EncodeFlags(uint32_t timestamp);
+  int EncodeFlags(uint32_t timestamp) override;
 
-  virtual bool ConfigureBitrates(int bitrate_kbit,
-                                 int max_bitrate_kbit,
-                                 int framerate,
-                                 vpx_codec_enc_cfg_t* cfg);
+  bool ConfigureBitrates(int bitrate_kbit,
+                         int max_bitrate_kbit,
+                         int framerate,
+                         vpx_codec_enc_cfg_t* cfg) override;
 
-  virtual void PopulateCodecSpecific(bool base_layer_sync,
-                                     CodecSpecificInfoVP8* vp8_info,
-                                     uint32_t timestamp);
+  void PopulateCodecSpecific(bool base_layer_sync,
+                             CodecSpecificInfoVP8* vp8_info,
+                             uint32_t timestamp) override;
 
-  virtual void FrameEncoded(unsigned int size, uint32_t timestamp) {}
+  void FrameEncoded(unsigned int size, uint32_t timestamp, int qp) override {}
 
-  virtual int CurrentLayerId() const;
+  bool UpdateConfiguration(vpx_codec_enc_cfg_t* cfg) override { return false; }
+
+  int CurrentLayerId() const override;
 
  private:
   enum TemporalReferences {
     // For 1 layer case: reference all (last, golden, and alt ref), but only
     // update last.
     kTemporalUpdateLastRefAll = 12,
     // First base layer frame for 3 temporal layers, which updates last and
     // golden with alt ref dependency.
     kTemporalUpdateLastAndGoldenRefAltRef = 11,
     // First enhancement layer with alt ref dependency.
@@ skipping 30 matching lines @@
   int temporal_pattern_length_;
   TemporalReferences temporal_pattern_[kMaxTemporalPattern];
   uint8_t tl0_pic_idx_;
   uint8_t pattern_idx_;
   uint32_t timestamp_;
   bool last_base_layer_sync_;
 };
 
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_DEFAULT_TEMPORAL_LAYERS_H_