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 // This file contains the interface for MediaConstraints, corresponding to 29 // the definition at 30 // http://www.w3.org/TR/mediacapture-streams/#mediastreamconstraints and also 31 // used in WebRTC: http://dev.w3.org/2011/webrtc/editor/webrtc.html#constraints. 32 33 #ifndef TALK_APP_WEBRTC_MEDIACONSTRAINTSINTERFACE_H_ 34 #define TALK_APP_WEBRTC_MEDIACONSTRAINTSINTERFACE_H_ 35 36 #include <string> 37 #include <vector> 38 39 namespace webrtc { 40 41 // MediaConstraintsInterface 42 // Interface used for passing arguments about media constraints 43 // to the MediaStream and PeerConnection implementation. 44 class MediaConstraintsInterface { 45 public: 46 struct Constraint { 47 Constraint() {} 48 Constraint(const std::string& key, const std::string value) 49 : key(key), value(value) { 50 } 51 std::string key; 52 std::string value; 53 }; 54 55 class Constraints : public std::vector<Constraint> { 56 public: 57 bool FindFirst(const std::string& key, std::string* value) const; 58 }; 59 60 virtual const Constraints& GetMandatory() const = 0; 61 virtual const Constraints& GetOptional() const = 0; 62 63 64 // Constraint keys used by a local video source. 65 // Specified by draft-alvestrand-constraints-resolution-00b 66 static const char kMinAspectRatio[]; // minAspectRatio 67 static const char kMaxAspectRatio[]; // maxAspectRatio 68 static const char kMaxWidth[]; // maxWidth 69 static const char kMinWidth[]; // minWidth 70 static const char kMaxHeight[]; // maxHeight 71 static const char kMinHeight[]; // minHeight 72 static const char kMaxFrameRate[]; // maxFrameRate 73 static const char kMinFrameRate[]; // minFrameRate 74 75 // Constraint keys used by a local audio source. 76 // These keys are google specific. 77 static const char kEchoCancellation[]; // googEchoCancellation 78 static const char kExperimentalEchoCancellation[]; // googEchoCancellation2 79 static const char kAutoGainControl[]; // googAutoGainControl 80 static const char kExperimentalAutoGainControl[]; // googAutoGainControl2 81 static const char kNoiseSuppression[]; // googNoiseSuppression 82 static const char kHighpassFilter[]; // googHighpassFilter 83 84 // Google-specific constraint keys for a local video source 85 static const char kNoiseReduction[]; // googNoiseReduction 86 static const char kLeakyBucket[]; // googLeakyBucket 87 // googTemporalLayeredScreencast 88 static const char kTemporalLayeredScreencast[]; 89 90 // Constraint keys for CreateOffer / CreateAnswer 91 // Specified by the W3C PeerConnection spec 92 static const char kOfferToReceiveVideo[]; // OfferToReceiveVideo 93 static const char kOfferToReceiveAudio[]; // OfferToReceiveAudio 94 static const char kVoiceActivityDetection[]; // VoiceActivityDetection 95 static const char kIceRestart[]; // IceRestart 96 // These keys are google specific. 97 static const char kUseRtpMux[]; // googUseRtpMUX 98 99 // Constraints values. 100 static const char kValueTrue[]; // true 101 static const char kValueFalse[]; // false 102 103 // Temporary pseudo-constraints used to enable DTLS-SRTP 104 static const char kEnableDtlsSrtp[]; // Enable DTLS-SRTP 105 // Temporary pseudo-constraints used to enable DataChannels 106 static const char kEnableRtpDataChannels[]; // Enable RTP DataChannels 107 static const char kEnableSctpDataChannels[]; // Enable SCTP DataChannels 108 109 // The prefix of internal-only constraints whose JS set values should be 110 // stripped by Chrome before passed down to Libjingle. 111 static const char kInternalConstraintPrefix[]; 112 113 // This constraint is for internal use only, representing the Chrome command 114 // line flag. So it is prefixed with "internal" so JS values will be removed. 115 // Used by a local audio source. 116 static const char kInternalAecDump[]; // internalAecDump 117 118 protected: 119 // Dtor protected as objects shouldn't be deleted via this interface 120 virtual ~MediaConstraintsInterface() {} 121 }; 122 123 bool FindConstraint(const MediaConstraintsInterface* constraints, 124 const std::string& key, bool* value, 125 size_t* mandatory_constraints); 126 127 } // namespace webrtc 128 129 #endif // TALK_APP_WEBRTC_MEDIACONSTRAINTSINTERFACE_H_ 130
