Add frame rate throttling to 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 <vector>
 
+#include "webrtc/base/rate_statistics.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;
 
@@ skipping 43 matching lines @@
   bool last_base_layer_sync_;
   uint8_t tl0_pic_idx_;
   int active_layer_;
   int64_t last_timestamp_;
   int64_t last_sync_timestamp_;
   int64_t last_emitted_tl0_timestamp_;
   rtc::TimestampWrapAroundHandler time_wrap_handler_;
   int min_qp_;
   int max_qp_;
   uint32_t max_debt_bytes_;
-  int framerate_;
+
+  // Configured max framerate.
+  rtc::Optional<uint32_t> target_framerate_;
+  // Incoming framerate from capturer.
+  rtc::Optional<uint32_t> incoming_framerate_;
+  // Tracks what framerate we actually encode, and drops frames on overshoot.
+  RateStatistics encode_framerate_;
   bool bitrate_updated_;
 
   static const int kMaxNumTemporalLayers = 2;
   struct TemporalLayer {
     TemporalLayer()
         : state(State::kNormal),
           enhanced_max_qp(-1),
           last_qp(-1),
           debt_bytes_(0),
           target_rate_kbps_(0) {}
@@ skipping 23 matching lines @@
     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_