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/logging.h"
35 #include "talk/base/stringencode.h"
36 #include "talk/base/stringutils.h"
37
38 namespace cricket {
39
40 static const int kMaxStaticPayloadId = 95;
41
operator ==(const FeedbackParam & other) const42 bool FeedbackParam::operator==(const FeedbackParam& other) const {
43 return _stricmp(other.id().c_str(), id().c_str()) == 0 &&
44 _stricmp(other.param().c_str(), param().c_str()) == 0;
45 }
46
operator ==(const FeedbackParams & other) const47 bool FeedbackParams::operator==(const FeedbackParams& other) const {
48 return params_ == other.params_;
49 }
50
Has(const FeedbackParam & param) const51 bool FeedbackParams::Has(const FeedbackParam& param) const {
52 return std::find(params_.begin(), params_.end(), param) != params_.end();
53 }
54
Add(const FeedbackParam & param)55 void FeedbackParams::Add(const FeedbackParam& param) {
56 if (param.id().empty()) {
57 return;
58 }
59 if (Has(param)) {
60 // Param already in |this|.
61 return;
62 }
63 params_.push_back(param);
64 ASSERT(!HasDuplicateEntries());
65 }
66
Intersect(const FeedbackParams & from)67 void FeedbackParams::Intersect(const FeedbackParams& from) {
68 std::vector<FeedbackParam>::iterator iter_to = params_.begin();
69 while (iter_to != params_.end()) {
70 if (!from.Has(*iter_to)) {
71 iter_to = params_.erase(iter_to);
72 } else {
73 ++iter_to;
74 }
75 }
76 }
77
HasDuplicateEntries() const78 bool FeedbackParams::HasDuplicateEntries() const {
79 for (std::vector<FeedbackParam>::const_iterator iter = params_.begin();
80 iter != params_.end(); ++iter) {
81 for (std::vector<FeedbackParam>::const_iterator found = iter + 1;
82 found != params_.end(); ++found) {
83 if (*found == *iter) {
84 return true;
85 }
86 }
87 }
88 return false;
89 }
90
Matches(const Codec & codec) const91 bool Codec::Matches(const Codec& codec) const {
92 // Match the codec id/name based on the typical static/dynamic name rules.
93 // Matching is case-insensitive.
94 return (codec.id <= kMaxStaticPayloadId) ?
95 (id == codec.id) : (_stricmp(name.c_str(), codec.name.c_str()) == 0);
96 }
97
GetParam(const std::string & name,std::string * out) const98 bool Codec::GetParam(const std::string& name, std::string* out) const {
99 CodecParameterMap::const_iterator iter = params.find(name);
100 if (iter == params.end())
101 return false;
102 *out = iter->second;
103 return true;
104 }
105
GetParam(const std::string & name,int * out) const106 bool Codec::GetParam(const std::string& name, int* out) const {
107 CodecParameterMap::const_iterator iter = params.find(name);
108 if (iter == params.end())
109 return false;
110 return talk_base::FromString(iter->second, out);
111 }
112
SetParam(const std::string & name,const std::string & value)113 void Codec::SetParam(const std::string& name, const std::string& value) {
114 params[name] = value;
115 }
116
SetParam(const std::string & name,int value)117 void Codec::SetParam(const std::string& name, int value) {
118 params[name] = talk_base::ToString(value);
119 }
120
AddFeedbackParam(const FeedbackParam & param)121 void Codec::AddFeedbackParam(const FeedbackParam& param) {
122 feedback_params.Add(param);
123 }
124
HasFeedbackParam(const FeedbackParam & param) const125 bool Codec::HasFeedbackParam(const FeedbackParam& param) const {
126 return feedback_params.Has(param);
127 }
128
IntersectFeedbackParams(const Codec & other)129 void Codec::IntersectFeedbackParams(const Codec& other) {
130 feedback_params.Intersect(other.feedback_params);
131 }
132
Matches(const AudioCodec & codec) const133 bool AudioCodec::Matches(const AudioCodec& codec) const {
134 // If a nonzero clockrate is specified, it must match the actual clockrate.
135 // If a nonzero bitrate is specified, it must match the actual bitrate,
136 // unless the codec is VBR (0), where we just force the supplied value.
137 // The number of channels must match exactly, with the exception
138 // that channels=0 is treated synonymously as channels=1, per RFC
139 // 4566 section 6: " [The channels] parameter is OPTIONAL and may be
140 // omitted if the number of channels is one."
141 // Preference is ignored.
142 // TODO(juberti): Treat a zero clockrate as 8000Hz, the RTP default clockrate.
143 return Codec::Matches(codec) &&
144 ((codec.clockrate == 0 /*&& clockrate == 8000*/) ||
145 clockrate == codec.clockrate) &&
146 (codec.bitrate == 0 || bitrate <= 0 || bitrate == codec.bitrate) &&
147 ((codec.channels < 2 && channels < 2) || channels == codec.channels);
148 }
149
ToString() const150 std::string AudioCodec::ToString() const {
151 std::ostringstream os;
152 os << "AudioCodec[" << id << ":" << name << ":" << clockrate << ":" << bitrate
153 << ":" << channels << ":" << preference << "]";
154 return os.str();
155 }
156
ToString() const157 std::string VideoCodec::ToString() const {
158 std::ostringstream os;
159 os << "VideoCodec[" << id << ":" << name << ":" << width << ":" << height
160 << ":" << framerate << ":" << preference << "]";
161 return os.str();
162 }
163
CreateRtxCodec(int rtx_payload_type,int associated_payload_type)164 VideoCodec VideoCodec::CreateRtxCodec(int rtx_payload_type,
165 int associated_payload_type) {
166 VideoCodec rtx_codec(rtx_payload_type, kRtxCodecName, 0, 0, 0, 0);
167 rtx_codec.SetParam(kCodecParamAssociatedPayloadType, associated_payload_type);
168 return rtx_codec;
169 }
170
GetCodecType() const171 VideoCodec::CodecType VideoCodec::GetCodecType() const {
172 const char* payload_name = name.c_str();
173 if (_stricmp(payload_name, kRedCodecName) == 0) {
174 return CODEC_RED;
175 }
176 if (_stricmp(payload_name, kUlpfecCodecName) == 0) {
177 return CODEC_ULPFEC;
178 }
179 if (_stricmp(payload_name, kRtxCodecName) == 0) {
180 return CODEC_RTX;
181 }
182
183 return CODEC_VIDEO;
184 }
185
ValidateCodecFormat() const186 bool VideoCodec::ValidateCodecFormat() const {
187 if (id < 0 || id > 127) {
188 LOG(LS_ERROR) << "Codec with invalid payload type: " << ToString();
189 return false;
190 }
191 if (GetCodecType() != CODEC_VIDEO) {
192 return true;
193 }
194
195 // Video validation from here on.
196
197 if (width <= 0 || height <= 0) {
198 LOG(LS_ERROR) << "Codec with invalid dimensions: " << ToString();
199 return false;
200 }
201 int min_bitrate = -1;
202 int max_bitrate = -1;
203 if (GetParam(kCodecParamMinBitrate, &min_bitrate) &&
204 GetParam(kCodecParamMaxBitrate, &max_bitrate)) {
205 if (max_bitrate < min_bitrate) {
206 LOG(LS_ERROR) << "Codec with max < min bitrate: " << ToString();
207 return false;
208 }
209 }
210 return true;
211 }
212
ToString() const213 std::string DataCodec::ToString() const {
214 std::ostringstream os;
215 os << "DataCodec[" << id << ":" << name << "]";
216 return os.str();
217 }
218
219 } // namespace cricket
220