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
37namespace cricket {
38
39static const int kMaxStaticPayloadId = 95;
40
41bool 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
46bool FeedbackParams::operator==(const FeedbackParams& other) const {
47  return params_ == other.params_;
48}
49
50bool FeedbackParams::Has(const FeedbackParam& param) const {
51  return std::find(params_.begin(), params_.end(), param) != params_.end();
52}
53
54void 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
66void 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
77bool 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
90bool 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
97bool 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
105bool 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
112void Codec::SetParam(const std::string& name, const std::string& value) {
113  params[name] = value;
114}
115
116void Codec::SetParam(const std::string& name, int value)  {
117  params[name] = talk_base::ToString(value);
118}
119
120void Codec::AddFeedbackParam(const FeedbackParam& param) {
121  feedback_params.Add(param);
122}
123
124bool Codec::HasFeedbackParam(const FeedbackParam& param) const {
125  return feedback_params.Has(param);
126}
127
128void Codec::IntersectFeedbackParams(const Codec& other) {
129  feedback_params.Intersect(other.feedback_params);
130}
131
132bool 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
149std::string AudioCodec::ToString() const {
150  std::ostringstream os;
151  os << "AudioCodec[" << id << ":" << name << ":" << clockrate << ":" << bitrate
152     << ":" << channels << ":" << preference << "]";
153  return os.str();
154}
155
156std::string VideoCodec::ToString() const {
157  std::ostringstream os;
158  os << "VideoCodec[" << id << ":" << name << ":" << width << ":" << height
159     << ":" << framerate << ":" << preference << "]";
160  return os.str();
161}
162
163std::string DataCodec::ToString() const {
164  std::ostringstream os;
165  os << "DataCodec[" << id << ":" << name << "]";
166  return os.str();
167}
168
169}  // namespace cricket
170