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
32 namespace webrtc {
33
34 const char MediaConstraintsInterface::kValueTrue[] = "true";
35 const char MediaConstraintsInterface::kValueFalse[] = "false";
36
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";
47
48 // Audio constraints.
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[] =
62 "googHighpassFilter";
63 const char MediaConstraintsInterface::kTypingNoiseDetection[] =
64 "googTypingNoiseDetection";
65 const char MediaConstraintsInterface::kAudioMirroring[] = "googAudioMirroring";
66
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
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[] =
81 "IceRestart";
82 // Google specific constraint for BUNDLE enable/disable.
83 const char MediaConstraintsInterface::kUseRtpMux[] =
84 "googUseRtpMUX";
85
86 // Below constraints should be used during PeerConnection construction.
87 const char MediaConstraintsInterface::kEnableDtlsSrtp[] =
88 "DtlsSrtpKeyAgreement";
89 const char MediaConstraintsInterface::kEnableRtpDataChannels[] =
90 "RtpDataChannels";
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::kNumUnsignalledRecvStreams[] =
97 "googNumUnsignalledRecvStreams";
98 const char MediaConstraintsInterface::kCombinedAudioVideoBwe[] =
99 "googCombinedAudioVideoBwe";
100 const char MediaConstraintsInterface::kScreencastMinBitrate[] =
101 "googScreencastMinBitrate";
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::kCpuUnderuseEncodeRsdThreshold[] =
110 "googCpuUnderuseEncodeRsdThreshold";
111 const char MediaConstraintsInterface::kCpuOveruseEncodeRsdThreshold[] =
112 "googCpuOveruseEncodeRsdThreshold";
113 const char MediaConstraintsInterface::kCpuOveruseEncodeUsage[] =
114 "googCpuOveruseEncodeUsage";
115 const char MediaConstraintsInterface::kHighStartBitrate[] =
116 "googHighStartBitrate";
117 const char MediaConstraintsInterface::kHighBitrate[] =
118 "googHighBitrate";
119 const char MediaConstraintsInterface::kVeryHighBitrate[] =
120 "googVeryHighBitrate";
121 const 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.
FindFirst(const std::string & key,std::string * value) const126 bool 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.
FindConstraint(const MediaConstraintsInterface * constraints,const std::string & key,bool * value,size_t * mandatory_constraints)147 bool 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