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/*
* Copyright (c) 2018 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.
*/
#include "logging/rtc_event_log/encoder/rtc_event_log_encoder_common.h"
#include "rtc_base/checks.h"
namespace webrtc {
namespace {
// We use 0x3fff because that gives decent precision (compared to the underlying
// measurement producing the packet loss fraction) on the one hand, while
// allowing us to use no more than 2 bytes in varint form on the other hand.
// (We might also fixed-size encode using at most 14 bits.)
constexpr uint32_t kPacketLossFractionRange = (1 << 14) - 1; // 0x3fff
constexpr float kPacketLossFractionRangeFloat =
static_cast<float>(kPacketLossFractionRange);
} // namespace
uint32_t ConvertPacketLossFractionToProtoFormat(float packet_loss_fraction) {
RTC_DCHECK_GE(packet_loss_fraction, 0);
RTC_DCHECK_LE(packet_loss_fraction, 1);
return static_cast<uint32_t>(packet_loss_fraction * kPacketLossFractionRange);
}
bool ParsePacketLossFractionFromProtoFormat(uint32_t proto_packet_loss_fraction,
float* output) {
if (proto_packet_loss_fraction >= kPacketLossFractionRange) {
return false;
}
*output = proto_packet_loss_fraction / kPacketLossFractionRangeFloat;
return true;
}
} // namespace webrtc
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