1 /* 2 * Copyright (c) 2016 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 MODULES_AUDIO_CODING_AUDIO_NETWORK_ADAPTOR_FRAME_LENGTH_CONTROLLER_H_ 12 #define MODULES_AUDIO_CODING_AUDIO_NETWORK_ADAPTOR_FRAME_LENGTH_CONTROLLER_H_ 13 14 #include <stddef.h> 15 16 #include <map> 17 #include <set> 18 19 #include "absl/types/optional.h" 20 #include "modules/audio_coding/audio_network_adaptor/controller.h" 21 #include "modules/audio_coding/audio_network_adaptor/include/audio_network_adaptor_config.h" 22 #include "rtc_base/constructor_magic.h" 23 24 namespace webrtc { 25 26 // Determines target frame length based on the network metrics and the decision 27 // of FEC controller. 28 class FrameLengthController final : public Controller { 29 public: 30 struct Config { 31 struct FrameLengthChange { 32 FrameLengthChange(int from_frame_length_ms, int to_frame_length_ms); 33 bool operator<(const FrameLengthChange& rhs) const; 34 int from_frame_length_ms; 35 int to_frame_length_ms; 36 }; 37 Config(const std::set<int>& encoder_frame_lengths_ms, 38 int initial_frame_length_ms, 39 int min_encoder_bitrate_bps, 40 float fl_increasing_packet_loss_fraction, 41 float fl_decreasing_packet_loss_fraction, 42 int fl_increase_overhead_offset, 43 int fl_decrease_overhead_offset, 44 std::map<FrameLengthChange, int> fl_changing_bandwidths_bps); 45 Config(const Config& other); 46 ~Config(); 47 std::set<int> encoder_frame_lengths_ms; 48 int initial_frame_length_ms; 49 int min_encoder_bitrate_bps; 50 // Uplink packet loss fraction below which frame length can increase. 51 float fl_increasing_packet_loss_fraction; 52 // Uplink packet loss fraction below which frame length should decrease. 53 float fl_decreasing_packet_loss_fraction; 54 // Offset to apply to overhead calculation when increasing frame length. 55 int fl_increase_overhead_offset; 56 // Offset to apply to overhead calculation when decreasing frame length. 57 int fl_decrease_overhead_offset; 58 std::map<FrameLengthChange, int> fl_changing_bandwidths_bps; 59 }; 60 61 explicit FrameLengthController(const Config& config); 62 63 ~FrameLengthController() override; 64 65 void UpdateNetworkMetrics(const NetworkMetrics& network_metrics) override; 66 67 void MakeDecision(AudioEncoderRuntimeConfig* config) override; 68 69 private: 70 bool FrameLengthIncreasingDecision(const AudioEncoderRuntimeConfig& config); 71 72 bool FrameLengthDecreasingDecision(const AudioEncoderRuntimeConfig& config); 73 74 const Config config_; 75 76 std::set<int>::const_iterator frame_length_ms_; 77 78 absl::optional<int> uplink_bandwidth_bps_; 79 80 absl::optional<float> uplink_packet_loss_fraction_; 81 82 absl::optional<size_t> overhead_bytes_per_packet_; 83 84 // True if the previous frame length decision was an increase, otherwise 85 // false. 86 bool prev_decision_increase_ = false; 87 88 RTC_DISALLOW_COPY_AND_ASSIGN(FrameLengthController); 89 }; 90 91 } // namespace webrtc 92 93 #endif // MODULES_AUDIO_CODING_AUDIO_NETWORK_ADAPTOR_FRAME_LENGTH_CONTROLLER_H_ 94