Line data    Source code

       1             : /*
       2             :  *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
       3             :  *
       4             :  *  Use of this source code is governed by a BSD-style license
       5             :  *  that can be found in the LICENSE file in the root of the source
       6             :  *  tree. An additional intellectual property rights grant can be found
       7             :  *  in the file PATENTS.  All contributing project authors may
       8             :  *  be found in the AUTHORS file in the root of the source tree.
       9             :  */
      10             : 
      11             : #ifndef WEBRTC_MODULES_VIDEO_CODING_CODEC_TIMER_H_
      12             : #define WEBRTC_MODULES_VIDEO_CODING_CODEC_TIMER_H_
      13             : 
      14             : #include <queue>
      15             : 
      16             : #include "webrtc/base/numerics/percentile_filter.h"
      17             : #include "webrtc/modules/include/module_common_types.h"
      18             : #include "webrtc/typedefs.h"
      19             : 
      20             : namespace webrtc {
      21             : 
      22           0 : class VCMCodecTimer {
      23             :  public:
      24             :   VCMCodecTimer();
      25             : 
      26             :   // Add a new decode time to the filter.
      27             :   void AddTiming(int64_t new_decode_time_ms, int64_t now_ms);
      28             : 
      29             :   // Get the required decode time in ms. It is the 95th percentile observed
      30             :   // decode time within a time window.
      31             :   int64_t RequiredDecodeTimeMs() const;
      32             : 
      33             :  private:
      34             :   struct Sample {
      35             :     Sample(int64_t decode_time_ms, int64_t sample_time_ms);
      36             :     int64_t decode_time_ms;
      37             :     int64_t sample_time_ms;
      38             :   };
      39             : 
      40             :   // The number of samples ignored so far.
      41             :   int ignored_sample_count_;
      42             :   // Queue with history of latest decode time values.
      43             :   std::queue<Sample> history_;
      44             :   // |filter_| contains the same values as |history_|, but in a data structure
      45             :   // that allows efficient retrieval of the percentile value.
      46             :   PercentileFilter<int64_t> filter_;
      47             : };
      48             : 
      49             : }  // namespace webrtc
      50             : 
      51             : #endif  // WEBRTC_MODULES_VIDEO_CODING_CODEC_TIMER_H_