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1 /* | |
2 * libjingle | |
3 * Copyright 2014 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/media/webrtc/webrtcmediaengine.h" | |
29 | |
30 #include <algorithm> | |
31 | |
32 #ifdef HAVE_WEBRTC_VIDEO | |
33 #include "talk/media/webrtc/webrtcvideoengine2.h" | |
34 #else | |
35 #include "talk/media/webrtc/nullwebrtcvideoengine.h" | |
36 #endif | |
37 #include "talk/media/webrtc/webrtcvoiceengine.h" | |
38 | |
39 namespace cricket { | |
40 | |
41 class WebRtcMediaEngine2 | |
42 #ifdef HAVE_WEBRTC_VIDEO | |
43 : public CompositeMediaEngine<WebRtcVoiceEngine, WebRtcVideoEngine2> { | |
44 #else | |
45 : public CompositeMediaEngine<WebRtcVoiceEngine, NullWebRtcVideoEngine> { | |
46 #endif | |
47 public: | |
48 WebRtcMediaEngine2(webrtc::AudioDeviceModule* adm, | |
49 WebRtcVideoEncoderFactory* encoder_factory, | |
50 WebRtcVideoDecoderFactory* decoder_factory) { | |
51 voice_.SetAudioDeviceModule(adm); | |
52 video_.SetExternalDecoderFactory(decoder_factory); | |
53 video_.SetExternalEncoderFactory(encoder_factory); | |
54 } | |
55 }; | |
56 | |
57 } // namespace cricket | |
58 | |
59 cricket::MediaEngineInterface* CreateWebRtcMediaEngine( | |
60 webrtc::AudioDeviceModule* adm, | |
61 cricket::WebRtcVideoEncoderFactory* encoder_factory, | |
62 cricket::WebRtcVideoDecoderFactory* decoder_factory) { | |
63 return new cricket::WebRtcMediaEngine2(adm, encoder_factory, | |
64 decoder_factory); | |
65 } | |
66 | |
67 void DestroyWebRtcMediaEngine(cricket::MediaEngineInterface* media_engine) { | |
68 delete media_engine; | |
69 } | |
70 | |
71 namespace cricket { | |
72 | |
73 // Used by PeerConnectionFactory to create a media engine passed into | |
74 // ChannelManager. | |
75 MediaEngineInterface* WebRtcMediaEngineFactory::Create( | |
76 webrtc::AudioDeviceModule* adm, | |
77 WebRtcVideoEncoderFactory* encoder_factory, | |
78 WebRtcVideoDecoderFactory* decoder_factory) { | |
79 return CreateWebRtcMediaEngine(adm, encoder_factory, decoder_factory); | |
80 } | |
81 | |
82 namespace { | |
83 // Remove mutually exclusive extensions with lower priority. | |
84 void DiscardRedundantExtensions( | |
85 std::vector<webrtc::RtpExtension>* extensions, | |
86 rtc::ArrayView<const char*> extensions_decreasing_prio) { | |
87 RTC_DCHECK(extensions); | |
88 bool found = false; | |
89 for (const char* name : extensions_decreasing_prio) { | |
90 auto it = std::find_if(extensions->begin(), extensions->end(), | |
91 [name](const webrtc::RtpExtension& rhs) { | |
92 return rhs.name == name; | |
93 }); | |
94 if (it != extensions->end()) { | |
95 if (found) { | |
96 extensions->erase(it); | |
97 } | |
98 found = true; | |
99 } | |
100 } | |
101 } | |
102 } // namespace | |
103 | |
104 bool ValidateRtpExtensions(const std::vector<RtpHeaderExtension>& extensions) { | |
105 bool id_used[14] = {false}; | |
106 for (const auto& extension : extensions) { | |
107 if (extension.id <= 0 || extension.id >= 15) { | |
108 LOG(LS_ERROR) << "Bad RTP extension ID: " << extension.ToString(); | |
109 return false; | |
110 } | |
111 if (id_used[extension.id - 1]) { | |
112 LOG(LS_ERROR) << "Duplicate RTP extension ID: " << extension.ToString(); | |
113 return false; | |
114 } | |
115 id_used[extension.id - 1] = true; | |
116 } | |
117 return true; | |
118 } | |
119 | |
120 std::vector<webrtc::RtpExtension> FilterRtpExtensions( | |
121 const std::vector<RtpHeaderExtension>& extensions, | |
122 bool (*supported)(const std::string&), | |
123 bool filter_redundant_extensions) { | |
124 RTC_DCHECK(ValidateRtpExtensions(extensions)); | |
125 RTC_DCHECK(supported); | |
126 std::vector<webrtc::RtpExtension> result; | |
127 | |
128 // Ignore any extensions that we don't recognize. | |
129 for (const auto& extension : extensions) { | |
130 if (supported(extension.uri)) { | |
131 result.push_back({extension.uri, extension.id}); | |
132 } else { | |
133 LOG(LS_WARNING) << "Unsupported RTP extension: " << extension.ToString(); | |
134 } | |
135 } | |
136 | |
137 // Sort by name, ascending, so that we don't reset extensions if they were | |
138 // specified in a different order (also allows us to use std::unique below). | |
139 std::sort(result.begin(), result.end(), | |
140 [](const webrtc::RtpExtension& rhs, const webrtc::RtpExtension& lhs) { | |
141 return rhs.name < lhs.name; | |
142 }); | |
143 | |
144 // Remove unnecessary extensions (used on send side). | |
145 if (filter_redundant_extensions) { | |
146 auto it = std::unique(result.begin(), result.end(), | |
147 [](const webrtc::RtpExtension& rhs, const webrtc::RtpExtension& lhs) { | |
148 return rhs.name == lhs.name; | |
149 }); | |
150 result.erase(it, result.end()); | |
151 | |
152 // Keep just the highest priority extension of any in the following list. | |
153 static const char* kBweExtensionPriorities[] = { | |
154 kRtpTransportSequenceNumberHeaderExtension, | |
155 kRtpAbsoluteSenderTimeHeaderExtension, | |
156 kRtpTimestampOffsetHeaderExtension | |
157 }; | |
158 DiscardRedundantExtensions(&result, kBweExtensionPriorities); | |
159 } | |
160 | |
161 return result; | |
162 } | |
163 } // namespace cricket | |
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