1/* 2 * libjingle 3 * Copyright 2013, Google Inc. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28#include "talk/app/webrtc/mediaconstraintsinterface.h" 29 30#include "webrtc/base/stringencode.h" 31 32namespace webrtc { 33 34const char MediaConstraintsInterface::kValueTrue[] = "true"; 35const char MediaConstraintsInterface::kValueFalse[] = "false"; 36 37// Constraints declared as static members in mediastreaminterface.h 38// Specified by draft-alvestrand-constraints-resolution-00b 39const char MediaConstraintsInterface::kMinAspectRatio[] = "minAspectRatio"; 40const char MediaConstraintsInterface::kMaxAspectRatio[] = "maxAspectRatio"; 41const char MediaConstraintsInterface::kMaxWidth[] = "maxWidth"; 42const char MediaConstraintsInterface::kMinWidth[] = "minWidth"; 43const char MediaConstraintsInterface::kMaxHeight[] = "maxHeight"; 44const char MediaConstraintsInterface::kMinHeight[] = "minHeight"; 45const char MediaConstraintsInterface::kMaxFrameRate[] = "maxFrameRate"; 46const char MediaConstraintsInterface::kMinFrameRate[] = "minFrameRate"; 47 48// Audio constraints. 49const char MediaConstraintsInterface::kEchoCancellation[] = 50 "googEchoCancellation"; 51const char MediaConstraintsInterface::kExperimentalEchoCancellation[] = 52 "googEchoCancellation2"; 53const char MediaConstraintsInterface::kAutoGainControl[] = 54 "googAutoGainControl"; 55const char MediaConstraintsInterface::kExperimentalAutoGainControl[] = 56 "googAutoGainControl2"; 57const char MediaConstraintsInterface::kNoiseSuppression[] = 58 "googNoiseSuppression"; 59const char MediaConstraintsInterface::kExperimentalNoiseSuppression[] = 60 "googNoiseSuppression2"; 61const char MediaConstraintsInterface::kHighpassFilter[] = 62 "googHighpassFilter"; 63const char MediaConstraintsInterface::kTypingNoiseDetection[] = 64 "googTypingNoiseDetection"; 65const char MediaConstraintsInterface::kAudioMirroring[] = "googAudioMirroring"; 66 67// Google-specific constraint keys for a local video source (getUserMedia). 68const char MediaConstraintsInterface::kNoiseReduction[] = "googNoiseReduction"; 69const char MediaConstraintsInterface::kLeakyBucket[] = "googLeakyBucket"; 70const char MediaConstraintsInterface::kTemporalLayeredScreencast[] = 71 "googTemporalLayeredScreencast"; 72 73// Constraint keys for CreateOffer / CreateAnswer defined in W3C specification. 74const char MediaConstraintsInterface::kOfferToReceiveAudio[] = 75 "OfferToReceiveAudio"; 76const char MediaConstraintsInterface::kOfferToReceiveVideo[] = 77 "OfferToReceiveVideo"; 78const char MediaConstraintsInterface::kVoiceActivityDetection[] = 79 "VoiceActivityDetection"; 80const char MediaConstraintsInterface::kIceRestart[] = 81 "IceRestart"; 82// Google specific constraint for BUNDLE enable/disable. 83const char MediaConstraintsInterface::kUseRtpMux[] = 84 "googUseRtpMUX"; 85 86// Below constraints should be used during PeerConnection construction. 87const char MediaConstraintsInterface::kEnableDtlsSrtp[] = 88 "DtlsSrtpKeyAgreement"; 89const char MediaConstraintsInterface::kEnableRtpDataChannels[] = 90 "RtpDataChannels"; 91// Google-specific constraint keys. 92const char MediaConstraintsInterface::kEnableDscp[] = "googDscp"; 93const char MediaConstraintsInterface::kEnableIPv6[] = "googIPv6"; 94const char MediaConstraintsInterface::kEnableVideoSuspendBelowMinBitrate[] = 95 "googSuspendBelowMinBitrate"; 96const char MediaConstraintsInterface::kNumUnsignalledRecvStreams[] = 97 "googNumUnsignalledRecvStreams"; 98const char MediaConstraintsInterface::kCombinedAudioVideoBwe[] = 99 "googCombinedAudioVideoBwe"; 100const char MediaConstraintsInterface::kScreencastMinBitrate[] = 101 "googScreencastMinBitrate"; 102// TODO(ronghuawu): Remove once cpu overuse detection is stable. 103const char MediaConstraintsInterface::kCpuOveruseDetection[] = 104 "googCpuOveruseDetection"; 105const char MediaConstraintsInterface::kCpuUnderuseThreshold[] = 106 "googCpuUnderuseThreshold"; 107const char MediaConstraintsInterface::kCpuOveruseThreshold[] = 108 "googCpuOveruseThreshold"; 109const char MediaConstraintsInterface::kCpuUnderuseEncodeRsdThreshold[] = 110 "googCpuUnderuseEncodeRsdThreshold"; 111const char MediaConstraintsInterface::kCpuOveruseEncodeRsdThreshold[] = 112 "googCpuOveruseEncodeRsdThreshold"; 113const char MediaConstraintsInterface::kCpuOveruseEncodeUsage[] = 114 "googCpuOveruseEncodeUsage"; 115const char MediaConstraintsInterface::kHighStartBitrate[] = 116 "googHighStartBitrate"; 117const char MediaConstraintsInterface::kHighBitrate[] = 118 "googHighBitrate"; 119const char MediaConstraintsInterface::kVeryHighBitrate[] = 120 "googVeryHighBitrate"; 121const char MediaConstraintsInterface::kPayloadPadding[] = "googPayloadPadding"; 122 123 124// Set |value| to the value associated with the first appearance of |key|, or 125// return false if |key| is not found. 126bool MediaConstraintsInterface::Constraints::FindFirst( 127 const std::string& key, std::string* value) const { 128 for (Constraints::const_iterator iter = begin(); iter != end(); ++iter) { 129 if (iter->key == key) { 130 *value = iter->value; 131 return true; 132 } 133 } 134 return false; 135} 136 137// Find the highest-priority instance of the boolean-valued constraint) named by 138// |key| and return its value as |value|. |constraints| can be null. 139// If |mandatory_constraints| is non-null, it is incremented if the key appears 140// among the mandatory constraints. 141// Returns true if the key was found and has a valid boolean value. 142// If the key appears multiple times as an optional constraint, appearances 143// after the first are ignored. 144// Note: Because this uses FindFirst, repeated optional constraints whose 145// first instance has an unrecognized value are not handled precisely in 146// accordance with the specification. 147bool FindConstraint(const MediaConstraintsInterface* constraints, 148 const std::string& key, bool* value, 149 size_t* mandatory_constraints) { 150 std::string string_value; 151 if (!constraints) { 152 return false; 153 } 154 if (constraints->GetMandatory().FindFirst(key, &string_value)) { 155 if (mandatory_constraints) 156 ++*mandatory_constraints; 157 return rtc::FromString(string_value, value); 158 } 159 if (constraints->GetOptional().FindFirst(key, &string_value)) { 160 return rtc::FromString(string_value, value); 161 } 162 return false; 163} 164 165} // namespace webrtc 166