1 files changed, 116 insertions, 0 deletions
diff --git a/third_party/libwebrtc/rtc_base/experiments/field_trial_units.cc b/third_party/libwebrtc/rtc_base/experiments/field_trial_units.cc
new file mode 100644
index 0000000000..92af46a9e3
--- /dev/null
+++ b/third_party/libwebrtc/rtc_base/experiments/field_trial_units.cc
@@ -0,0 +1,116 @@
+/*
+ *  Copyright 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 "rtc_base/experiments/field_trial_units.h"
+
+#include <stdio.h>
+
+#include <limits>
+#include <string>
+
+#include "absl/strings/string_view.h"
+#include "absl/types/optional.h"
+
+// Large enough to fit "seconds", the longest supported unit name.
+#define RTC_TRIAL_UNIT_LENGTH_STR "7"
+#define RTC_TRIAL_UNIT_SIZE 8
+
+namespace webrtc {
+namespace {
+
+struct ValueWithUnit {
+  double value;
+  std::string unit;
+};
+
+absl::optional<ValueWithUnit> ParseValueWithUnit(absl::string_view str) {
+  if (str == "inf") {
+    return ValueWithUnit{std::numeric_limits<double>::infinity(), ""};
+  } else if (str == "-inf") {
+    return ValueWithUnit{-std::numeric_limits<double>::infinity(), ""};
+  } else {
+    double double_val;
+    char unit_char[RTC_TRIAL_UNIT_SIZE];
+    unit_char[0] = 0;
+    if (sscanf(std::string(str).c_str(), "%lf%" RTC_TRIAL_UNIT_LENGTH_STR "s",
+               &double_val, unit_char) >= 1) {
+      return ValueWithUnit{double_val, unit_char};
+    }
+  }
+  return absl::nullopt;
+}
+}  // namespace
+
+template <>
+absl::optional<DataRate> ParseTypedParameter<DataRate>(absl::string_view str) {
+  absl::optional<ValueWithUnit> result = ParseValueWithUnit(str);
+  if (result) {
+    if (result->unit.empty() || result->unit == "kbps") {
+      return DataRate::KilobitsPerSec(result->value);
+    } else if (result->unit == "bps") {
+      return DataRate::BitsPerSec(result->value);
+    }
+  }
+  return absl::nullopt;
+}
+
+template <>
+absl::optional<DataSize> ParseTypedParameter<DataSize>(absl::string_view str) {
+  absl::optional<ValueWithUnit> result = ParseValueWithUnit(str);
+  if (result) {
+    if (result->unit.empty() || result->unit == "bytes")
+      return DataSize::Bytes(result->value);
+  }
+  return absl::nullopt;
+}
+
+template <>
+absl::optional<TimeDelta> ParseTypedParameter<TimeDelta>(
+    absl::string_view str) {
+  absl::optional<ValueWithUnit> result = ParseValueWithUnit(str);
+  if (result) {
+    if (result->unit == "s" || result->unit == "seconds") {
+      return TimeDelta::Seconds(result->value);
+    } else if (result->unit == "us") {
+      return TimeDelta::Micros(result->value);
+    } else if (result->unit.empty() || result->unit == "ms") {
+      return TimeDelta::Millis(result->value);
+    }
+  }
+  return absl::nullopt;
+}
+
+template <>
+absl::optional<absl::optional<DataRate>>
+ParseTypedParameter<absl::optional<DataRate>>(absl::string_view str) {
+  return ParseOptionalParameter<DataRate>(str);
+}
+template <>
+absl::optional<absl::optional<DataSize>>
+ParseTypedParameter<absl::optional<DataSize>>(absl::string_view str) {
+  return ParseOptionalParameter<DataSize>(str);
+}
+template <>
+absl::optional<absl::optional<TimeDelta>>
+ParseTypedParameter<absl::optional<TimeDelta>>(absl::string_view str) {
+  return ParseOptionalParameter<TimeDelta>(str);
+}
+
+template class FieldTrialParameter<DataRate>;
+template class FieldTrialParameter<DataSize>;
+template class FieldTrialParameter<TimeDelta>;
+
+template class FieldTrialConstrained<DataRate>;
+template class FieldTrialConstrained<DataSize>;
+template class FieldTrialConstrained<TimeDelta>;
+
+template class FieldTrialOptional<DataRate>;
+template class FieldTrialOptional<DataSize>;
+template class FieldTrialOptional<TimeDelta>;
+}  // namespace webrtc