3 * Copyright 2013, Google Inc.
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28 #include "talk/app/webrtc/mediaconstraintsinterface.h"
30 #include "talk/base/stringencode.h"
34 const char MediaConstraintsInterface::kValueTrue[] = "true";
35 const char MediaConstraintsInterface::kValueFalse[] = "false";
37 // Constraints declared as static members in mediastreaminterface.h
38 // Specified by draft-alvestrand-constraints-resolution-00b
39 const char MediaConstraintsInterface::kMinAspectRatio[] = "minAspectRatio";
40 const char MediaConstraintsInterface::kMaxAspectRatio[] = "maxAspectRatio";
41 const char MediaConstraintsInterface::kMaxWidth[] = "maxWidth";
42 const char MediaConstraintsInterface::kMinWidth[] = "minWidth";
43 const char MediaConstraintsInterface::kMaxHeight[] = "maxHeight";
44 const char MediaConstraintsInterface::kMinHeight[] = "minHeight";
45 const char MediaConstraintsInterface::kMaxFrameRate[] = "maxFrameRate";
46 const char MediaConstraintsInterface::kMinFrameRate[] = "minFrameRate";
49 const char MediaConstraintsInterface::kEchoCancellation[] =
50 "googEchoCancellation";
51 const char MediaConstraintsInterface::kExperimentalEchoCancellation[] =
52 "googEchoCancellation2";
53 const char MediaConstraintsInterface::kAutoGainControl[] =
54 "googAutoGainControl";
55 const char MediaConstraintsInterface::kExperimentalAutoGainControl[] =
56 "googAutoGainControl2";
57 const char MediaConstraintsInterface::kNoiseSuppression[] =
58 "googNoiseSuppression";
59 const char MediaConstraintsInterface::kExperimentalNoiseSuppression[] =
60 "googNoiseSuppression2";
61 const char MediaConstraintsInterface::kHighpassFilter[] =
63 const char MediaConstraintsInterface::kTypingNoiseDetection[] =
64 "googTypingNoiseDetection";
65 const char MediaConstraintsInterface::kAudioMirroring[] = "googAudioMirroring";
67 // Google-specific constraint keys for a local video source (getUserMedia).
68 const char MediaConstraintsInterface::kNoiseReduction[] = "googNoiseReduction";
69 const char MediaConstraintsInterface::kLeakyBucket[] = "googLeakyBucket";
70 const char MediaConstraintsInterface::kTemporalLayeredScreencast[] =
71 "googTemporalLayeredScreencast";
72 // TODO(ronghuawu): Remove once cpu overuse detection is stable.
73 const char MediaConstraintsInterface::kCpuOveruseDetection[] =
74 "googCpuOveruseDetection";
76 // Constraint keys for CreateOffer / CreateAnswer defined in W3C specification.
77 const char MediaConstraintsInterface::kOfferToReceiveAudio[] =
78 "OfferToReceiveAudio";
79 const char MediaConstraintsInterface::kOfferToReceiveVideo[] =
80 "OfferToReceiveVideo";
81 const char MediaConstraintsInterface::kVoiceActivityDetection[] =
82 "VoiceActivityDetection";
83 const char MediaConstraintsInterface::kIceRestart[] =
85 // Google specific constraint for BUNDLE enable/disable.
86 const char MediaConstraintsInterface::kUseRtpMux[] =
89 // Below constraints should be used during PeerConnection construction.
90 const char MediaConstraintsInterface::kEnableDtlsSrtp[] =
91 "DtlsSrtpKeyAgreement";
92 const char MediaConstraintsInterface::kEnableRtpDataChannels[] =
94 const char MediaConstraintsInterface::kEnableDscp[] = "googDscp";
95 const char MediaConstraintsInterface::kEnableIPv6[] = "googIPv6";
97 // Set |value| to the value associated with the first appearance of |key|, or
98 // return false if |key| is not found.
99 bool MediaConstraintsInterface::Constraints::FindFirst(
100 const std::string& key, std::string* value) const {
101 for (Constraints::const_iterator iter = begin(); iter != end(); ++iter) {
102 if (iter->key == key) {
103 *value = iter->value;
110 // Find the highest-priority instance of the boolean-valued constraint) named by
111 // |key| and return its value as |value|. |constraints| can be null.
112 // If |mandatory_constraints| is non-null, it is incremented if the key appears
113 // among the mandatory constraints.
114 // Returns true if the key was found and has a valid boolean value.
115 // If the key appears multiple times as an optional constraint, appearances
116 // after the first are ignored.
117 // Note: Because this uses FindFirst, repeated optional constraints whose
118 // first instance has an unrecognized value are not handled precisely in
119 // accordance with the specification.
120 bool FindConstraint(const MediaConstraintsInterface* constraints,
121 const std::string& key, bool* value,
122 size_t* mandatory_constraints) {
123 std::string string_value;
127 if (constraints->GetMandatory().FindFirst(key, &string_value)) {
128 if (mandatory_constraints)
129 ++*mandatory_constraints;
130 return talk_base::FromString(string_value, value);
132 if (constraints->GetOptional().FindFirst(key, &string_value)) {
133 return talk_base::FromString(string_value, value);
138 } // namespace webrtc