1 /* 2 * Copyright 2018 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 RTC_BASE_EXPERIMENTS_CPU_SPEED_EXPERIMENT_H_ 12 #define RTC_BASE_EXPERIMENTS_CPU_SPEED_EXPERIMENT_H_ 13 14 #include <vector> 15 16 #include "absl/types/optional.h" 17 18 #include "rtc_base/experiments/field_trial_parser.h" 19 20 namespace webrtc { 21 22 class CpuSpeedExperiment { 23 public: 24 CpuSpeedExperiment(); 25 ~CpuSpeedExperiment(); 26 27 // Example: 28 // WebRTC-VP8-CpuSpeed-Arm/pixels:100|200|300,cpu_speed:-1|-2|-3/ 29 // pixels <= 100 -> cpu speed: -1 30 // pixels <= 200 -> cpu speed: -2 31 // pixels <= 300 -> cpu speed: -3 32 33 // WebRTC-VP8-CpuSpeed-Arm/pixels:100|200|300,cpu_speed:-1|-2|-3/, 34 // cpu_speed_le_cores:-4|-5|-6,cores:3/ 35 // If `num_cores` > 3 36 // pixels <= 100 -> cpu speed: -1 37 // pixels <= 200 -> cpu speed: -2 38 // pixels <= 300 -> cpu speed: -3 39 // else 40 // pixels <= 100 -> cpu speed: -4 41 // pixels <= 200 -> cpu speed: -5 42 // pixels <= 300 -> cpu speed: -6 43 44 struct Config { 45 int pixels = 0; // The video frame size. 46 int cpu_speed = 0; // The `cpu_speed` to be used if the frame size is less 47 // than or equal to `pixels`. 48 // Optional. 49 int cpu_speed_le_cores = 0; // Same as `cpu_speed` above but only used if 50 // `num_cores` <= `cores_`. 51 }; 52 53 // Gets the cpu speed based on `pixels` and `num_cores`. 54 absl::optional<int> GetValue(int pixels, int num_cores) const; 55 56 private: 57 std::vector<Config> configs_; 58 59 // Threshold for when to use `cpu_speed_le_cores`. 60 FieldTrialOptional<int> cores_; 61 }; 62 63 } // namespace webrtc 64 65 #endif // RTC_BASE_EXPERIMENTS_CPU_SPEED_EXPERIMENT_H_ 66