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 const int kMaxPayloadId = 127;
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
Codec(int id,const std::string & name,int clockrate,int preference)91 Codec::Codec(int id, const std::string& name, int clockrate, int preference)
92 : id(id), name(name), clockrate(clockrate), preference(preference) {
93 }
94
Codec()95 Codec::Codec() : id(0), clockrate(0), preference(0) {
96 }
97
98 Codec::Codec(const Codec& c) = default;
99
100 Codec::~Codec() = default;
101
operator =(const Codec & c)102 Codec& Codec::operator=(const Codec& c) {
103 this->id = c.id; // id is reserved in objective-c
104 name = c.name;
105 clockrate = c.clockrate;
106 preference = c.preference;
107 params = c.params;
108 feedback_params = c.feedback_params;
109 return *this;
110 }
111
operator ==(const Codec & c) const112 bool Codec::operator==(const Codec& c) const {
113 return this->id == c.id && // id is reserved in objective-c
114 name == c.name && clockrate == c.clockrate &&
115 preference == c.preference && params == c.params &&
116 feedback_params == c.feedback_params;
117 }
118
Matches(const Codec & codec) const119 bool Codec::Matches(const Codec& codec) const {
120 // Match the codec id/name based on the typical static/dynamic name rules.
121 // Matching is case-insensitive.
122 const int kMaxStaticPayloadId = 95;
123 return (codec.id <= kMaxStaticPayloadId) ?
124 (id == codec.id) : (_stricmp(name.c_str(), codec.name.c_str()) == 0);
125 }
126
GetParam(const std::string & name,std::string * out) const127 bool Codec::GetParam(const std::string& name, std::string* out) const {
128 CodecParameterMap::const_iterator iter = params.find(name);
129 if (iter == params.end())
130 return false;
131 *out = iter->second;
132 return true;
133 }
134
GetParam(const std::string & name,int * out) const135 bool Codec::GetParam(const std::string& name, int* out) const {
136 CodecParameterMap::const_iterator iter = params.find(name);
137 if (iter == params.end())
138 return false;
139 return rtc::FromString(iter->second, out);
140 }
141
SetParam(const std::string & name,const std::string & value)142 void Codec::SetParam(const std::string& name, const std::string& value) {
143 params[name] = value;
144 }
145
SetParam(const std::string & name,int value)146 void Codec::SetParam(const std::string& name, int value) {
147 params[name] = rtc::ToString(value);
148 }
149
RemoveParam(const std::string & name)150 bool Codec::RemoveParam(const std::string& name) {
151 return params.erase(name) == 1;
152 }
153
AddFeedbackParam(const FeedbackParam & param)154 void Codec::AddFeedbackParam(const FeedbackParam& param) {
155 feedback_params.Add(param);
156 }
157
HasFeedbackParam(const FeedbackParam & param) const158 bool Codec::HasFeedbackParam(const FeedbackParam& param) const {
159 return feedback_params.Has(param);
160 }
161
IntersectFeedbackParams(const Codec & other)162 void Codec::IntersectFeedbackParams(const Codec& other) {
163 feedback_params.Intersect(other.feedback_params);
164 }
165
AudioCodec(int id,const std::string & name,int clockrate,int bitrate,size_t channels,int preference)166 AudioCodec::AudioCodec(int id,
167 const std::string& name,
168 int clockrate,
169 int bitrate,
170 size_t channels,
171 int preference)
172 : Codec(id, name, clockrate, preference),
173 bitrate(bitrate),
174 channels(channels) {
175 }
176
AudioCodec()177 AudioCodec::AudioCodec() : Codec(), bitrate(0), channels(0) {
178 }
179
180 AudioCodec::AudioCodec(const AudioCodec& c) = default;
181
operator =(const AudioCodec & c)182 AudioCodec& AudioCodec::operator=(const AudioCodec& c) {
183 Codec::operator=(c);
184 bitrate = c.bitrate;
185 channels = c.channels;
186 return *this;
187 }
188
operator ==(const AudioCodec & c) const189 bool AudioCodec::operator==(const AudioCodec& c) const {
190 return bitrate == c.bitrate && channels == c.channels && Codec::operator==(c);
191 }
192
Matches(const AudioCodec & codec) const193 bool AudioCodec::Matches(const AudioCodec& codec) const {
194 // If a nonzero clockrate is specified, it must match the actual clockrate.
195 // If a nonzero bitrate is specified, it must match the actual bitrate,
196 // unless the codec is VBR (0), where we just force the supplied value.
197 // The number of channels must match exactly, with the exception
198 // that channels=0 is treated synonymously as channels=1, per RFC
199 // 4566 section 6: " [The channels] parameter is OPTIONAL and may be
200 // omitted if the number of channels is one."
201 // Preference is ignored.
202 // TODO(juberti): Treat a zero clockrate as 8000Hz, the RTP default clockrate.
203 return Codec::Matches(codec) &&
204 ((codec.clockrate == 0 /*&& clockrate == 8000*/) ||
205 clockrate == codec.clockrate) &&
206 (codec.bitrate == 0 || bitrate <= 0 || bitrate == codec.bitrate) &&
207 ((codec.channels < 2 && channels < 2) || channels == codec.channels);
208 }
209
ToString() const210 std::string AudioCodec::ToString() const {
211 std::ostringstream os;
212 os << "AudioCodec[" << id << ":" << name << ":" << clockrate << ":" << bitrate
213 << ":" << channels << ":" << preference << "]";
214 return os.str();
215 }
216
ToString() const217 std::string VideoCodec::ToString() const {
218 std::ostringstream os;
219 os << "VideoCodec[" << id << ":" << name << ":" << width << ":" << height
220 << ":" << framerate << ":" << preference << "]";
221 return os.str();
222 }
223
VideoCodec(int id,const std::string & name,int width,int height,int framerate,int preference)224 VideoCodec::VideoCodec(int id,
225 const std::string& name,
226 int width,
227 int height,
228 int framerate,
229 int preference)
230 : Codec(id, name, kVideoCodecClockrate, preference),
231 width(width),
232 height(height),
233 framerate(framerate) {
234 }
235
VideoCodec(int id,const std::string & name)236 VideoCodec::VideoCodec(int id, const std::string& name)
237 : Codec(id, name, kVideoCodecClockrate, 0),
238 width(0),
239 height(0),
240 framerate(0) {
241 }
242
VideoCodec()243 VideoCodec::VideoCodec() : Codec(), width(0), height(0), framerate(0) {
244 clockrate = kVideoCodecClockrate;
245 }
246
247 VideoCodec::VideoCodec(const VideoCodec& c) = default;
248
operator =(const VideoCodec & c)249 VideoCodec& VideoCodec::operator=(const VideoCodec& c) {
250 Codec::operator=(c);
251 width = c.width;
252 height = c.height;
253 framerate = c.framerate;
254 return *this;
255 }
256
operator ==(const VideoCodec & c) const257 bool VideoCodec::operator==(const VideoCodec& c) const {
258 return width == c.width && height == c.height && framerate == c.framerate &&
259 Codec::operator==(c);
260 }
261
CreateRtxCodec(int rtx_payload_type,int associated_payload_type)262 VideoCodec VideoCodec::CreateRtxCodec(int rtx_payload_type,
263 int associated_payload_type) {
264 VideoCodec rtx_codec(rtx_payload_type, kRtxCodecName, 0, 0, 0, 0);
265 rtx_codec.SetParam(kCodecParamAssociatedPayloadType, associated_payload_type);
266 return rtx_codec;
267 }
268
GetCodecType() const269 VideoCodec::CodecType VideoCodec::GetCodecType() const {
270 const char* payload_name = name.c_str();
271 if (_stricmp(payload_name, kRedCodecName) == 0) {
272 return CODEC_RED;
273 }
274 if (_stricmp(payload_name, kUlpfecCodecName) == 0) {
275 return CODEC_ULPFEC;
276 }
277 if (_stricmp(payload_name, kRtxCodecName) == 0) {
278 return CODEC_RTX;
279 }
280
281 return CODEC_VIDEO;
282 }
283
ValidateCodecFormat() const284 bool VideoCodec::ValidateCodecFormat() const {
285 if (id < 0 || id > 127) {
286 LOG(LS_ERROR) << "Codec with invalid payload type: " << ToString();
287 return false;
288 }
289 if (GetCodecType() != CODEC_VIDEO) {
290 return true;
291 }
292
293 // Video validation from here on.
294
295 if (width <= 0 || height <= 0) {
296 LOG(LS_ERROR) << "Codec with invalid dimensions: " << ToString();
297 return false;
298 }
299 int min_bitrate = -1;
300 int max_bitrate = -1;
301 if (GetParam(kCodecParamMinBitrate, &min_bitrate) &&
302 GetParam(kCodecParamMaxBitrate, &max_bitrate)) {
303 if (max_bitrate < min_bitrate) {
304 LOG(LS_ERROR) << "Codec with max < min bitrate: " << ToString();
305 return false;
306 }
307 }
308 return true;
309 }
310
DataCodec(int id,const std::string & name,int preference)311 DataCodec::DataCodec(int id, const std::string& name, int preference)
312 : Codec(id, name, kDataCodecClockrate, preference) {
313 }
314
DataCodec()315 DataCodec::DataCodec() : Codec() {
316 clockrate = kDataCodecClockrate;
317 }
318
319 DataCodec::DataCodec(const DataCodec& c) = default;
320
321 DataCodec& DataCodec::operator=(const DataCodec& c) = default;
322
ToString() const323 std::string DataCodec::ToString() const {
324 std::ostringstream os;
325 os << "DataCodec[" << id << ":" << name << "]";
326 return os.str();
327 }
328
HasNack(const VideoCodec & codec)329 bool HasNack(const VideoCodec& codec) {
330 return codec.HasFeedbackParam(
331 FeedbackParam(kRtcpFbParamNack, kParamValueEmpty));
332 }
333
HasRemb(const VideoCodec & codec)334 bool HasRemb(const VideoCodec& codec) {
335 return codec.HasFeedbackParam(
336 FeedbackParam(kRtcpFbParamRemb, kParamValueEmpty));
337 }
338
HasTransportCc(const VideoCodec & codec)339 bool HasTransportCc(const VideoCodec& codec) {
340 return codec.HasFeedbackParam(
341 FeedbackParam(kRtcpFbParamTransportCc, kParamValueEmpty));
342 }
343
CodecNamesEq(const std::string & name1,const std::string & name2)344 bool CodecNamesEq(const std::string& name1, const std::string& name2) {
345 return _stricmp(name1.c_str(), name2.c_str()) == 0;
346 }
347
348 } // namespace cricket
349