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 "webrtc/base/common.h" 34 #include "webrtc/base/logging.h" 35 #include "webrtc/base/stringencode.h" 36 #include "webrtc/base/stringutils.h" 37 38 namespace cricket { 39 40 static const int kMaxStaticPayloadId = 95; 41 const int kMaxPayloadId = 127; 42 43 bool FeedbackParam::operator==(const FeedbackParam& other) const { 44 return _stricmp(other.id().c_str(), id().c_str()) == 0 && 45 _stricmp(other.param().c_str(), param().c_str()) == 0; 46 } 47 48 bool FeedbackParams::operator==(const FeedbackParams& other) const { 49 return params_ == other.params_; 50 } 51 52 bool FeedbackParams::Has(const FeedbackParam& param) const { 53 return std::find(params_.begin(), params_.end(), param) != params_.end(); 54 } 55 56 void FeedbackParams::Add(const FeedbackParam& param) { 57 if (param.id().empty()) { 58 return; 59 } 60 if (Has(param)) { 61 // Param already in |this|. 62 return; 63 } 64 params_.push_back(param); 65 ASSERT(!HasDuplicateEntries()); 66 } 67 68 void FeedbackParams::Intersect(const FeedbackParams& from) { 69 std::vector<FeedbackParam>::iterator iter_to = params_.begin(); 70 while (iter_to != params_.end()) { 71 if (!from.Has(*iter_to)) { 72 iter_to = params_.erase(iter_to); 73 } else { 74 ++iter_to; 75 } 76 } 77 } 78 79 bool FeedbackParams::HasDuplicateEntries() const { 80 for (std::vector<FeedbackParam>::const_iterator iter = params_.begin(); 81 iter != params_.end(); ++iter) { 82 for (std::vector<FeedbackParam>::const_iterator found = iter + 1; 83 found != params_.end(); ++found) { 84 if (*found == *iter) { 85 return true; 86 } 87 } 88 } 89 return false; 90 } 91 92 bool Codec::Matches(const Codec& codec) const { 93 // Match the codec id/name based on the typical static/dynamic name rules. 94 // Matching is case-insensitive. 95 return (codec.id <= kMaxStaticPayloadId) ? 96 (id == codec.id) : (_stricmp(name.c_str(), codec.name.c_str()) == 0); 97 } 98 99 bool Codec::GetParam(const std::string& name, std::string* out) const { 100 CodecParameterMap::const_iterator iter = params.find(name); 101 if (iter == params.end()) 102 return false; 103 *out = iter->second; 104 return true; 105 } 106 107 bool Codec::GetParam(const std::string& name, int* out) const { 108 CodecParameterMap::const_iterator iter = params.find(name); 109 if (iter == params.end()) 110 return false; 111 return rtc::FromString(iter->second, out); 112 } 113 114 void Codec::SetParam(const std::string& name, const std::string& value) { 115 params[name] = value; 116 } 117 118 void Codec::SetParam(const std::string& name, int value) { 119 params[name] = rtc::ToString(value); 120 } 121 122 bool Codec::RemoveParam(const std::string& name) { 123 return params.erase(name) == 1; 124 } 125 126 void Codec::AddFeedbackParam(const FeedbackParam& param) { 127 feedback_params.Add(param); 128 } 129 130 bool Codec::HasFeedbackParam(const FeedbackParam& param) const { 131 return feedback_params.Has(param); 132 } 133 134 void Codec::IntersectFeedbackParams(const Codec& other) { 135 feedback_params.Intersect(other.feedback_params); 136 } 137 138 bool AudioCodec::Matches(const AudioCodec& codec) const { 139 // If a nonzero clockrate is specified, it must match the actual clockrate. 140 // If a nonzero bitrate is specified, it must match the actual bitrate, 141 // unless the codec is VBR (0), where we just force the supplied value. 142 // The number of channels must match exactly, with the exception 143 // that channels=0 is treated synonymously as channels=1, per RFC 144 // 4566 section 6: " [The channels] parameter is OPTIONAL and may be 145 // omitted if the number of channels is one." 146 // Preference is ignored. 147 // TODO(juberti): Treat a zero clockrate as 8000Hz, the RTP default clockrate. 148 return Codec::Matches(codec) && 149 ((codec.clockrate == 0 /*&& clockrate == 8000*/) || 150 clockrate == codec.clockrate) && 151 (codec.bitrate == 0 || bitrate <= 0 || bitrate == codec.bitrate) && 152 ((codec.channels < 2 && channels < 2) || channels == codec.channels); 153 } 154 155 std::string AudioCodec::ToString() const { 156 std::ostringstream os; 157 os << "AudioCodec[" << id << ":" << name << ":" << clockrate << ":" << bitrate 158 << ":" << channels << ":" << preference << "]"; 159 return os.str(); 160 } 161 162 std::string VideoCodec::ToString() const { 163 std::ostringstream os; 164 os << "VideoCodec[" << id << ":" << name << ":" << width << ":" << height 165 << ":" << framerate << ":" << preference << "]"; 166 return os.str(); 167 } 168 169 VideoCodec VideoCodec::CreateRtxCodec(int rtx_payload_type, 170 int associated_payload_type) { 171 VideoCodec rtx_codec(rtx_payload_type, kRtxCodecName, 0, 0, 0, 0); 172 rtx_codec.SetParam(kCodecParamAssociatedPayloadType, associated_payload_type); 173 return rtx_codec; 174 } 175 176 VideoCodec::CodecType VideoCodec::GetCodecType() const { 177 const char* payload_name = name.c_str(); 178 if (_stricmp(payload_name, kRedCodecName) == 0) { 179 return CODEC_RED; 180 } 181 if (_stricmp(payload_name, kUlpfecCodecName) == 0) { 182 return CODEC_ULPFEC; 183 } 184 if (_stricmp(payload_name, kRtxCodecName) == 0) { 185 return CODEC_RTX; 186 } 187 188 return CODEC_VIDEO; 189 } 190 191 bool VideoCodec::ValidateCodecFormat() const { 192 if (id < 0 || id > 127) { 193 LOG(LS_ERROR) << "Codec with invalid payload type: " << ToString(); 194 return false; 195 } 196 if (GetCodecType() != CODEC_VIDEO) { 197 return true; 198 } 199 200 // Video validation from here on. 201 202 if (width <= 0 || height <= 0) { 203 LOG(LS_ERROR) << "Codec with invalid dimensions: " << ToString(); 204 return false; 205 } 206 int min_bitrate = -1; 207 int max_bitrate = -1; 208 if (GetParam(kCodecParamMinBitrate, &min_bitrate) && 209 GetParam(kCodecParamMaxBitrate, &max_bitrate)) { 210 if (max_bitrate < min_bitrate) { 211 LOG(LS_ERROR) << "Codec with max < min bitrate: " << ToString(); 212 return false; 213 } 214 } 215 return true; 216 } 217 218 std::string DataCodec::ToString() const { 219 std::ostringstream os; 220 os << "DataCodec[" << id << ":" << name << "]"; 221 return os.str(); 222 } 223 224 } // namespace cricket 225
