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/*
* Copyright 2016 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.
*/
#import "RTCFieldTrials.h"
#include <memory>
#import "base/RTCLogging.h"
#include "system_wrappers/include/field_trial.h"
NSString * const kRTCFieldTrialAudioForceNoTWCCKey = @"WebRTC-Audio-ForceNoTWCC";
NSString * const kRTCFieldTrialAudioForceABWENoTWCCKey = @"WebRTC-Audio-ABWENoTWCC";
NSString * const kRTCFieldTrialSendSideBweWithOverheadKey = @"WebRTC-SendSideBwe-WithOverhead";
NSString * const kRTCFieldTrialFlexFec03AdvertisedKey = @"WebRTC-FlexFEC-03-Advertised";
NSString * const kRTCFieldTrialFlexFec03Key = @"WebRTC-FlexFEC-03";
NSString * const kRTCFieldTrialH264HighProfileKey = @"WebRTC-H264HighProfile";
NSString * const kRTCFieldTrialMinimizeResamplingOnMobileKey =
@"WebRTC-Audio-MinimizeResamplingOnMobile";
NSString *const kRTCFieldTrialUseNWPathMonitor = @"WebRTC-Network-UseNWPathMonitor";
NSString * const kRTCFieldTrialEnabledValue = @"Enabled";
// InitFieldTrialsFromString stores the char*, so the char array must outlive
// the application.
static char *gFieldTrialInitString = nullptr;
void RTCInitFieldTrialDictionary(NSDictionary<NSString *, NSString *> *fieldTrials) {
if (!fieldTrials) {
RTCLogWarning(@"No fieldTrials provided.");
return;
}
// Assemble the keys and values into the field trial string.
// We don't perform any extra format checking. That should be done by the underlying WebRTC calls.
NSMutableString *fieldTrialInitString = [NSMutableString string];
for (NSString *key in fieldTrials) {
NSString *fieldTrialEntry = [NSString stringWithFormat:@"%@/%@/", key, fieldTrials[key]];
[fieldTrialInitString appendString:fieldTrialEntry];
}
size_t len = fieldTrialInitString.length + 1;
if (gFieldTrialInitString != nullptr) {
delete[] gFieldTrialInitString;
}
gFieldTrialInitString = new char[len];
if (![fieldTrialInitString getCString:gFieldTrialInitString
maxLength:len
encoding:NSUTF8StringEncoding]) {
RTCLogError(@"Failed to convert field trial string.");
return;
}
webrtc::field_trial::InitFieldTrialsFromString(gFieldTrialInitString);
}
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