1 /* 2 * Copyright (c) 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 #include "logging/rtc_event_log/encoder/rtc_event_log_encoder_common.h" 12 13 #include "rtc_base/checks.h" 14 15 namespace webrtc { 16 namespace { 17 // We use 0x3fff because that gives decent precision (compared to the underlying 18 // measurement producing the packet loss fraction) on the one hand, while 19 // allowing us to use no more than 2 bytes in varint form on the other hand. 20 // (We might also fixed-size encode using at most 14 bits.) 21 constexpr uint32_t kPacketLossFractionRange = (1 << 14) - 1; // 0x3fff 22 constexpr float kPacketLossFractionRangeFloat = 23 static_cast<float>(kPacketLossFractionRange); 24 } // namespace 25 ConvertPacketLossFractionToProtoFormat(float packet_loss_fraction)26uint32_t ConvertPacketLossFractionToProtoFormat(float packet_loss_fraction) { 27 RTC_DCHECK_GE(packet_loss_fraction, 0); 28 RTC_DCHECK_LE(packet_loss_fraction, 1); 29 return static_cast<uint32_t>(packet_loss_fraction * kPacketLossFractionRange); 30 } 31 ParsePacketLossFractionFromProtoFormat(uint32_t proto_packet_loss_fraction,float * output)32bool ParsePacketLossFractionFromProtoFormat(uint32_t proto_packet_loss_fraction, 33 float* output) { 34 if (proto_packet_loss_fraction >= kPacketLossFractionRange) { 35 return false; 36 } 37 *output = proto_packet_loss_fraction / kPacketLossFractionRangeFloat; 38 return true; 39 } 40 } // namespace webrtc 41