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 41 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 46 bool FeedbackParams::operator==(const FeedbackParams& other) const { 47 return params_ == other.params_; 48 } 49 50 bool FeedbackParams::Has(const FeedbackParam& param) const { 51 return std::find(params_.begin(), params_.end(), param) != params_.end(); 52 } 53 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 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 77 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 90 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 97 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 } 104 105 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 } 111 112 void Codec::SetParam(const std::string& name, const std::string& value) { 113 params[name] = value; 114 } 115 116 void Codec::SetParam(const std::string& name, int value) { 117 params[name] = talk_base::ToString(value); 118 } 119 120 void Codec::AddFeedbackParam(const FeedbackParam& param) { 121 feedback_params.Add(param); 122 } 123 124 bool Codec::HasFeedbackParam(const FeedbackParam& param) const { 125 return feedback_params.Has(param); 126 } 127 128 void Codec::IntersectFeedbackParams(const Codec& other) { 129 feedback_params.Intersect(other.feedback_params); 130 } 131 132 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 } 148 149 std::string AudioCodec::ToString() const { 150 std::ostringstream os; 151 os << "AudioCodec[" << id << ":" << name << ":" << clockrate << ":" << bitrate 152 << ":" << channels << ":" << preference << "]"; 153 return os.str(); 154 } 155 156 std::string VideoCodec::ToString() const { 157 std::ostringstream os; 158 os << "VideoCodec[" << id << ":" << name << ":" << width << ":" << height 159 << ":" << framerate << ":" << preference << "]"; 160 return os.str(); 161 } 162 163 std::string DataCodec::ToString() const { 164 std::ostringstream os; 165 os << "DataCodec[" << id << ":" << name << "]"; 166 return os.str(); 167 } 168 169 } // namespace cricket 170
