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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";
73 // Constraint keys for CreateOffer / CreateAnswer defined in W3C specification.
74 const char MediaConstraintsInterface::kOfferToReceiveAudio[] =
75 "OfferToReceiveAudio";
76 const char MediaConstraintsInterface::kOfferToReceiveVideo[] =
77 "OfferToReceiveVideo";
78 const char MediaConstraintsInterface::kVoiceActivityDetection[] =
79 "VoiceActivityDetection";
80 const char MediaConstraintsInterface::kIceRestart[] =
82 // Google specific constraint for BUNDLE enable/disable.
83 const char MediaConstraintsInterface::kUseRtpMux[] =
86 // Below constraints should be used during PeerConnection construction.
87 const char MediaConstraintsInterface::kEnableDtlsSrtp[] =
88 "DtlsSrtpKeyAgreement";
89 const char MediaConstraintsInterface::kEnableRtpDataChannels[] =
91 // Google-specific constraint keys.
92 const char MediaConstraintsInterface::kEnableDscp[] = "googDscp";
93 const char MediaConstraintsInterface::kEnableIPv6[] = "googIPv6";
94 const char MediaConstraintsInterface::kEnableVideoSuspendBelowMinBitrate[] =
95 "googSuspendBelowMinBitrate";
96 const char MediaConstraintsInterface::kImprovedWifiBwe[] =
97 "googImprovedWifiBwe";
98 const char MediaConstraintsInterface::kScreencastMinBitrate[] =
99 "googScreencastMinBitrate";
100 const char MediaConstraintsInterface::kSkipEncodingUnusedStreams[] =
101 "googSkipEncodingUnusedStreams";
102 // TODO(ronghuawu): Remove once cpu overuse detection is stable.
103 const char MediaConstraintsInterface::kCpuOveruseDetection[] =
104 "googCpuOveruseDetection";
105 const char MediaConstraintsInterface::kCpuUnderuseThreshold[] =
106 "googCpuUnderuseThreshold";
107 const char MediaConstraintsInterface::kCpuOveruseThreshold[] =
108 "googCpuOveruseThreshold";
109 const char MediaConstraintsInterface::kCpuOveruseEncodeUsage[] =
110 "googCpuOveruseEncodeUsage";
111 const char MediaConstraintsInterface::kHighStartBitrate[] =
112 "googHighStartBitrate";
113 const char MediaConstraintsInterface::kHighBitrate[] =
115 const char MediaConstraintsInterface::kVeryHighBitrate[] =
116 "googVeryHighBitrate";
118 // Set |value| to the value associated with the first appearance of |key|, or
119 // return false if |key| is not found.
120 bool MediaConstraintsInterface::Constraints::FindFirst(
121 const std::string& key, std::string* value) const {
122 for (Constraints::const_iterator iter = begin(); iter != end(); ++iter) {
123 if (iter->key == key) {
124 *value = iter->value;
131 // Find the highest-priority instance of the boolean-valued constraint) named by
132 // |key| and return its value as |value|. |constraints| can be null.
133 // If |mandatory_constraints| is non-null, it is incremented if the key appears
134 // among the mandatory constraints.
135 // Returns true if the key was found and has a valid boolean value.
136 // If the key appears multiple times as an optional constraint, appearances
137 // after the first are ignored.
138 // Note: Because this uses FindFirst, repeated optional constraints whose
139 // first instance has an unrecognized value are not handled precisely in
140 // accordance with the specification.
141 bool FindConstraint(const MediaConstraintsInterface* constraints,
142 const std::string& key, bool* value,
143 size_t* mandatory_constraints) {
144 std::string string_value;
148 if (constraints->GetMandatory().FindFirst(key, &string_value)) {
149 if (mandatory_constraints)
150 ++*mandatory_constraints;
151 return talk_base::FromString(string_value, value);
153 if (constraints->GetOptional().FindFirst(key, &string_value)) {
154 return talk_base::FromString(string_value, value);
159 } // namespace webrtc