Add stats (histograms) for vp8 screenshare layers

webrtc/modules/video_coding/codecs/vp8/screenshare_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.
 */
 #ifndef WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_SCREENSHARE_LAYERS_H_
 #define WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_SCREENSHARE_LAYERS_H_
 
 #include <list>
 
 #include "vpx/vpx_encoder.h"
 
 #include "webrtc/base/timeutils.h"
 #include "webrtc/modules/video_coding/codecs/vp8/temporal_layers.h"
 #include "webrtc/modules/video_coding/utility/frame_dropper.h"
 #include "webrtc/typedefs.h"
 
 namespace webrtc {
 
 struct CodecSpecificInfoVP8;
+class Clock;
 
 class ScreenshareLayers : public TemporalLayers {
  public:
   static const double kMaxTL0FpsReduction;
   static const double kAcceptableTargetOvershoot;
   static const int kTl0Flags;
   static const int kTl1Flags;
   static const int kTl1SyncFlags;
 
-  ScreenshareLayers(int num_temporal_layers, uint8_t initial_tl0_pic_idx);
-  virtual ~ScreenshareLayers() {}
+  ScreenshareLayers(int num_temporal_layers,
+                    uint8_t initial_tl0_pic_idx,
+                    Clock* clock);
+  virtual ~ScreenshareLayers();
 
   // Returns the recommended VP8 encode flags needed. May refresh the decoder
   // and/or update the reference buffers.
   int EncodeFlags(uint32_t timestamp) override;
 
   bool ConfigureBitrates(int bitrate_kbps,
                          int max_bitrate_kbps,
                          int framerate,
                          vpx_codec_enc_cfg_t* cfg) override;
 
   void PopulateCodecSpecific(bool base_layer_sync,
                              CodecSpecificInfoVP8* vp8_info,
                              uint32_t timestamp) override;
 
   void FrameEncoded(unsigned int size, uint32_t timestamp, int qp) override;
 
   int CurrentLayerId() const override;
 
   // Allows the layers adapter to update the encoder configuration prior to a
   // frame being encoded. Return true if the configuration should be updated
   // and false if now change is needed.
   bool UpdateConfiguration(vpx_codec_enc_cfg_t* cfg) override;
 
  private:
   bool TimeToSync(int64_t timestamp) const;
 
+  Clock* const clock_;
+
   int number_of_temporal_layers_;
   bool last_base_layer_sync_;
   uint8_t tl0_pic_idx_;
   int active_layer_;
   int64_t last_timestamp_;
   int64_t last_sync_timestamp_;
   rtc::TimestampWrapAroundHandler time_wrap_handler_;
   int min_qp_;
   int max_qp_;
   uint32_t max_debt_bytes_;
@@ skipping 15 matching lines @@
       kQualityBoost,
     } state;
 
     int enhanced_max_qp;
     int last_qp;
     uint32_t debt_bytes_;
     uint32_t target_rate_kbps_;
 
     void UpdateDebt(int64_t delta_ms);
   } layers_[kMaxNumTemporalLayers];
+
+  void UpdateHistograms();
+  // Data for histogram statistics.
+  struct Stats {
+    int64_t first_framt_time_ms_ = -1;
+    int64_t num_tl0_frames_ = 0;
+    int64_t num_tl1_frames_ = 0;
+    int64_t num_dropped_frames_ = 0;
+    int64_t num_overshoots_ = 0;
+    int64_t tl0_qp_sum_ = 0;
+    int64_t tl1_qp_sum_ = 0;
+    int64_t tl0_target_bitrate_sum_ = 0;
+    int64_t tl1_target_bitrate_sum_ = 0;
+  } stats_;
 };
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_SCREENSHARE_LAYERS_H_