mirror of
https://github.com/danog/libtgvoip.git
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5caaaafa42
I'm now using the entire audio processing module from WebRTC as opposed to individual DSP algorithms pulled from there before. Seems to work better this way.
91 lines
3.4 KiB
C++
91 lines
3.4 KiB
C++
//
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// Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the LICENSE file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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//
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#ifndef SYSTEM_WRAPPERS_INCLUDE_FIELD_TRIAL_H_
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#define SYSTEM_WRAPPERS_INCLUDE_FIELD_TRIAL_H_
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#include <string>
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// Field trials allow webrtc clients (such as Chrome) to turn on feature code
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// in binaries out in the field and gather information with that.
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//
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// By default WebRTC provides an implementaion of field trials that can be
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// found in system_wrappers/source/field_trial.cc. If clients want to provide
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// a custom version, they will have to:
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//
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// 1. Compile WebRTC defining the preprocessor macro
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// WEBRTC_EXCLUDE_FIELD_TRIAL_DEFAULT (if GN is used this can be achieved
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// by setting the GN arg rtc_exclude_field_trial_default to true).
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// 2. Provide an implementation of:
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// std::string webrtc::field_trial::FindFullName(const std::string& trial).
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//
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// They are designed to wire up directly to chrome field trials and to speed up
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// developers by reducing the need to wire APIs to control whether a feature is
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// on/off. E.g. to experiment with a new method that could lead to a different
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// trade-off between CPU/bandwidth:
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//
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// 1 - Develop the feature with default behaviour off:
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//
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// if (FieldTrial::FindFullName("WebRTCExperimenMethod2") == "Enabled")
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// method2();
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// else
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// method1();
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//
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// 2 - Once the changes are rolled to chrome, the new code path can be
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// controlled as normal chrome field trials.
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//
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// 3 - Evaluate the new feature and clean the code paths.
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//
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// Notes:
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// - NOT every feature is a candidate to be controlled by this mechanism as
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// it may require negotation between involved parties (e.g. SDP).
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//
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// TODO(andresp): since chrome --force-fieldtrials does not marks the trial
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// as active it does not gets propaged to renderer process. For now one
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// needs to push a config with start_active:true or run a local finch
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// server.
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//
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// TODO(andresp): find out how to get bots to run tests with trials enabled.
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namespace webrtc {
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namespace field_trial {
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// Returns the group name chosen for the named trial, or the empty string
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// if the trial does not exists.
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//
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// Note: To keep things tidy append all the trial names with WebRTC.
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std::string FindFullName(const std::string& name);
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// Convenience method, returns true iff FindFullName(name) return a string that
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// starts with "Enabled".
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// TODO(tommi): Make sure all implementations support this.
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inline bool IsEnabled(const char* name) {
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return FindFullName(name).find("Enabled") == 0;
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}
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// Convenience method, returns true iff FindFullName(name) return a string that
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// starts with "Disabled".
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inline bool IsDisabled(const char* name) {
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return FindFullName(name).find("Disabled") == 0;
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}
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// Optionally initialize field trial from a string.
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// This method can be called at most once before any other call into webrtc.
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// E.g. before the peer connection factory is constructed.
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// Note: trials_string must never be destroyed.
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void InitFieldTrialsFromString(const char* trials_string);
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const char* GetFieldTrialString();
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} // namespace field_trial
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} // namespace webrtc
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#endif // SYSTEM_WRAPPERS_INCLUDE_FIELD_TRIAL_H_
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