1 /*
2 * libjingle
3 * Copyright 2004 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/base/codec.h"
29
30 #include <algorithm>
31 #include <sstream>
32
33 #include "talk/base/common.h"
34 #include "talk/base/stringencode.h"
35 #include "talk/base/stringutils.h"
36
37 namespace cricket {
38
39 static const int kMaxStaticPayloadId = 95;
40
operator ==(const FeedbackParam & other) const41 bool FeedbackParam::operator==(const FeedbackParam& other) const {
42 return _stricmp(other.id().c_str(), id().c_str()) == 0 &&
43 _stricmp(other.param().c_str(), param().c_str()) == 0;
44 }
45
operator ==(const FeedbackParams & other) const46 bool FeedbackParams::operator==(const FeedbackParams& other) const {
47 return params_ == other.params_;
48 }
49
Has(const FeedbackParam & param) const50 bool FeedbackParams::Has(const FeedbackParam& param) const {
51 return std::find(params_.begin(), params_.end(), param) != params_.end();
52 }
53
Add(const FeedbackParam & param)54 void FeedbackParams::Add(const FeedbackParam& param) {
55 if (param.id().empty()) {
56 return;
57 }
58 if (Has(param)) {
59 // Param already in |this|.
60 return;
61 }
62 params_.push_back(param);
63 ASSERT(!HasDuplicateEntries());
64 }
65
Intersect(const FeedbackParams & from)66 void FeedbackParams::Intersect(const FeedbackParams& from) {
67 std::vector<FeedbackParam>::iterator iter_to = params_.begin();
68 while (iter_to != params_.end()) {
69 if (!from.Has(*iter_to)) {
70 iter_to = params_.erase(iter_to);
71 } else {
72 ++iter_to;
73 }
74 }
75 }
76
HasDuplicateEntries() const77 bool FeedbackParams::HasDuplicateEntries() const {
78 for (std::vector<FeedbackParam>::const_iterator iter = params_.begin();
79 iter != params_.end(); ++iter) {
80 for (std::vector<FeedbackParam>::const_iterator found = iter + 1;
81 found != params_.end(); ++found) {
82 if (*found == *iter) {
83 return true;
84 }
85 }
86 }
87 return false;
88 }
89
Matches(const Codec & codec) const90 bool Codec::Matches(const Codec& codec) const {
91 // Match the codec id/name based on the typical static/dynamic name rules.
92 // Matching is case-insensitive.
93 return (codec.id <= kMaxStaticPayloadId) ?
94 (id == codec.id) : (_stricmp(name.c_str(), codec.name.c_str()) == 0);
95 }
96
GetParam(const std::string & name,std::string * out) const97 bool Codec::GetParam(const std::string& name, std::string* out) const {
98 CodecParameterMap::const_iterator iter = params.find(name);
99 if (iter == params.end())
100 return false;
101 *out = iter->second;
102 return true;
103 }
104
GetParam(const std::string & name,int * out) const105 bool Codec::GetParam(const std::string& name, int* out) const {
106 CodecParameterMap::const_iterator iter = params.find(name);
107 if (iter == params.end())
108 return false;
109 return talk_base::FromString(iter->second, out);
110 }
111
SetParam(const std::string & name,const std::string & value)112 void Codec::SetParam(const std::string& name, const std::string& value) {
113 params[name] = value;
114 }
115
SetParam(const std::string & name,int value)116 void Codec::SetParam(const std::string& name, int value) {
117 params[name] = talk_base::ToString(value);
118 }
119
AddFeedbackParam(const FeedbackParam & param)120 void Codec::AddFeedbackParam(const FeedbackParam& param) {
121 feedback_params.Add(param);
122 }
123
HasFeedbackParam(const FeedbackParam & param) const124 bool Codec::HasFeedbackParam(const FeedbackParam& param) const {
125 return feedback_params.Has(param);
126 }
127
IntersectFeedbackParams(const Codec & other)128 void Codec::IntersectFeedbackParams(const Codec& other) {
129 feedback_params.Intersect(other.feedback_params);
130 }
131
Matches(const AudioCodec & codec) const132 bool AudioCodec::Matches(const AudioCodec& codec) const {
133 // If a nonzero clockrate is specified, it must match the actual clockrate.
134 // If a nonzero bitrate is specified, it must match the actual bitrate,
135 // unless the codec is VBR (0), where we just force the supplied value.
136 // The number of channels must match exactly, with the exception
137 // that channels=0 is treated synonymously as channels=1, per RFC
138 // 4566 section 6: " [The channels] parameter is OPTIONAL and may be
139 // omitted if the number of channels is one."
140 // Preference is ignored.
141 // TODO(juberti): Treat a zero clockrate as 8000Hz, the RTP default clockrate.
142 return Codec::Matches(codec) &&
143 ((codec.clockrate == 0 /*&& clockrate == 8000*/) ||
144 clockrate == codec.clockrate) &&
145 (codec.bitrate == 0 || bitrate <= 0 || bitrate == codec.bitrate) &&
146 ((codec.channels < 2 && channels < 2) || channels == codec.channels);
147 }
148
ToString() const149 std::string AudioCodec::ToString() const {
150 std::ostringstream os;
151 os << "AudioCodec[" << id << ":" << name << ":" << clockrate << ":" << bitrate
152 << ":" << channels << ":" << preference << "]";
153 return os.str();
154 }
155
ToString() const156 std::string VideoCodec::ToString() const {
157 std::ostringstream os;
158 os << "VideoCodec[" << id << ":" << name << ":" << width << ":" << height
159 << ":" << framerate << ":" << preference << "]";
160 return os.str();
161 }
162
ToString() const163 std::string DataCodec::ToString() const {
164 std::ostringstream os;
165 os << "DataCodec[" << id << ":" << name << "]";
166 return os.str();
167 }
168
169 } // namespace cricket
170