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 #ifndef TALK_MEDIA_BASE_CODEC_H_ 29 #define TALK_MEDIA_BASE_CODEC_H_ 30 31 #include <map> 32 #include <set> 33 #include <string> 34 #include <vector> 35 36 #include "talk/media/base/constants.h" 37 38 namespace cricket { 39 40 typedef std::map<std::string, std::string> CodecParameterMap; 41 42 extern const int kMaxPayloadId; 43 44 class FeedbackParam { 45 public: 46 FeedbackParam(const std::string& id, const std::string& param) 47 : id_(id), 48 param_(param) { 49 } 50 explicit FeedbackParam(const std::string& id) 51 : id_(id), 52 param_(kParamValueEmpty) { 53 } 54 bool operator==(const FeedbackParam& other) const; 55 56 const std::string& id() const { return id_; } 57 const std::string& param() const { return param_; } 58 59 private: 60 std::string id_; // e.g. "nack", "ccm" 61 std::string param_; // e.g. "", "rpsi", "fir" 62 }; 63 64 class FeedbackParams { 65 public: 66 bool operator==(const FeedbackParams& other) const; 67 68 bool Has(const FeedbackParam& param) const; 69 void Add(const FeedbackParam& param); 70 71 void Intersect(const FeedbackParams& from); 72 73 const std::vector<FeedbackParam>& params() const { return params_; } 74 private: 75 bool HasDuplicateEntries() const; 76 77 std::vector<FeedbackParam> params_; 78 }; 79 80 struct Codec { 81 int id; 82 std::string name; 83 int clockrate; 84 int preference; 85 CodecParameterMap params; 86 FeedbackParams feedback_params; 87 88 // Creates a codec with the given parameters. 89 Codec(int id, const std::string& name, int clockrate, int preference); 90 // Creates an empty codec. 91 Codec(); 92 Codec(const Codec& c); 93 ~Codec(); 94 95 // Indicates if this codec is compatible with the specified codec. 96 bool Matches(const Codec& codec) const; 97 98 // Find the parameter for |name| and write the value to |out|. 99 bool GetParam(const std::string& name, std::string* out) const; 100 bool GetParam(const std::string& name, int* out) const; 101 102 void SetParam(const std::string& name, const std::string& value); 103 void SetParam(const std::string& name, int value); 104 105 // It is safe to input a non-existent parameter. 106 // Returns true if the parameter existed, false if it did not exist. 107 bool RemoveParam(const std::string& name); 108 109 bool HasFeedbackParam(const FeedbackParam& param) const; 110 void AddFeedbackParam(const FeedbackParam& param); 111 112 static bool Preferable(const Codec& first, const Codec& other) { 113 return first.preference > other.preference; 114 } 115 116 // Filter |this| feedbacks params such that only those shared by both |this| 117 // and |other| are kept. 118 void IntersectFeedbackParams(const Codec& other); 119 120 Codec& operator=(const Codec& c); 121 122 bool operator==(const Codec& c) const; 123 124 bool operator!=(const Codec& c) const { 125 return !(*this == c); 126 } 127 }; 128 129 struct AudioCodec : public Codec { 130 int bitrate; 131 size_t channels; 132 133 // Creates a codec with the given parameters. 134 AudioCodec(int id, 135 const std::string& name, 136 int clockrate, 137 int bitrate, 138 size_t channels, 139 int preference); 140 // Creates an empty codec. 141 AudioCodec(); 142 AudioCodec(const AudioCodec& c); 143 ~AudioCodec() = default; 144 145 // Indicates if this codec is compatible with the specified codec. 146 bool Matches(const AudioCodec& codec) const; 147 148 static bool Preferable(const AudioCodec& first, const AudioCodec& other) { 149 return first.preference > other.preference; 150 } 151 152 std::string ToString() const; 153 154 AudioCodec& operator=(const AudioCodec& c); 155 156 bool operator==(const AudioCodec& c) const; 157 158 bool operator!=(const AudioCodec& c) const { 159 return !(*this == c); 160 } 161 }; 162 163 struct VideoCodec : public Codec { 164 int width; 165 int height; 166 int framerate; 167 168 // Creates a codec with the given parameters. 169 VideoCodec(int id, 170 const std::string& name, 171 int width, 172 int height, 173 int framerate, 174 int preference); 175 VideoCodec(int id, const std::string& name); 176 // Creates an empty codec. 177 VideoCodec(); 178 VideoCodec(const VideoCodec& c); 179 ~VideoCodec() = default; 180 181 static bool Preferable(const VideoCodec& first, const VideoCodec& other) { 182 return first.preference > other.preference; 183 } 184 185 std::string ToString() const; 186 187 VideoCodec& operator=(const VideoCodec& c); 188 189 bool operator==(const VideoCodec& c) const; 190 191 bool operator!=(const VideoCodec& c) const { 192 return !(*this == c); 193 } 194 195 static VideoCodec CreateRtxCodec(int rtx_payload_type, 196 int associated_payload_type); 197 198 enum CodecType { 199 CODEC_VIDEO, 200 CODEC_RED, 201 CODEC_ULPFEC, 202 CODEC_RTX, 203 }; 204 205 CodecType GetCodecType() const; 206 // Validates a VideoCodec's payload type, dimensions and bitrates etc. If they 207 // don't make sense (such as max < min bitrate), and error is logged and 208 // ValidateCodecFormat returns false. 209 bool ValidateCodecFormat() const; 210 }; 211 212 struct DataCodec : public Codec { 213 DataCodec(int id, const std::string& name, int preference); 214 DataCodec(); 215 DataCodec(const DataCodec& c); 216 217 DataCodec& operator=(const DataCodec& c); 218 219 std::string ToString() const; 220 }; 221 222 // Get the codec setting associated with |payload_type|. If there 223 // is no codec associated with that payload type it returns false. 224 template <class Codec> 225 bool FindCodecById(const std::vector<Codec>& codecs, 226 int payload_type, 227 Codec* codec_out) { 228 for (const auto& codec : codecs) { 229 if (codec.id == payload_type) { 230 *codec_out = codec; 231 return true; 232 } 233 } 234 return false; 235 } 236 237 bool CodecNamesEq(const std::string& name1, const std::string& name2); 238 bool HasNack(const VideoCodec& codec); 239 bool HasRemb(const VideoCodec& codec); 240 bool HasTransportCc(const VideoCodec& codec); 241 242 } // namespace cricket 243 244 #endif // TALK_MEDIA_BASE_CODEC_H_ 245
