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 42 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 47 bool FeedbackParams::operator==(const FeedbackParams& other) const { 48 return params_ == other.params_; 49 } 50 51 bool FeedbackParams::Has(const FeedbackParam& param) const { 52 return std::find(params_.begin(), params_.end(), param) != params_.end(); 53 } 54 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 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 78 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 91 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 98 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 } 105 106 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 } 112 113 void Codec::SetParam(const std::string& name, const std::string& value) { 114 params[name] = value; 115 } 116 117 void Codec::SetParam(const std::string& name, int value) { 118 params[name] = talk_base::ToString(value); 119 } 120 121 void Codec::AddFeedbackParam(const FeedbackParam& param) { 122 feedback_params.Add(param); 123 } 124 125 bool Codec::HasFeedbackParam(const FeedbackParam& param) const { 126 return feedback_params.Has(param); 127 } 128 129 void Codec::IntersectFeedbackParams(const Codec& other) { 130 feedback_params.Intersect(other.feedback_params); 131 } 132 133 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 } 149 150 std::string AudioCodec::ToString() const { 151 std::ostringstream os; 152 os << "AudioCodec[" << id << ":" << name << ":" << clockrate << ":" << bitrate 153 << ":" << channels << ":" << preference << "]"; 154 return os.str(); 155 } 156 157 std::string VideoCodec::ToString() const { 158 std::ostringstream os; 159 os << "VideoCodec[" << id << ":" << name << ":" << width << ":" << height 160 << ":" << framerate << ":" << preference << "]"; 161 return os.str(); 162 } 163 164 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 } 170 171 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 } 185 186 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 } 212 213 std::string DataCodec::ToString() const { 214 std::ostringstream os; 215 os << "DataCodec[" << id << ":" << name << "]"; 216 return os.str(); 217 } 218 219 } // namespace cricket 220
