1/*
2 * libjingle
3 * Copyright 2012 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/app/webrtc/jsepsessiondescription.h"
29
30#include "talk/app/webrtc/webrtcsdp.h"
31#include "talk/session/media/mediasession.h"
32#include "webrtc/base/arraysize.h"
33#include "webrtc/base/stringencode.h"
34
35using rtc::scoped_ptr;
36using cricket::SessionDescription;
37
38namespace webrtc {
39
40static const char* kSupportedTypes[] = {
41    JsepSessionDescription::kOffer,
42    JsepSessionDescription::kPrAnswer,
43    JsepSessionDescription::kAnswer
44};
45
46static bool IsTypeSupported(const std::string& type) {
47  bool type_supported = false;
48  for (size_t i = 0; i < arraysize(kSupportedTypes); ++i) {
49    if (kSupportedTypes[i] == type) {
50      type_supported = true;
51      break;
52    }
53  }
54  return type_supported;
55}
56
57const char SessionDescriptionInterface::kOffer[] = "offer";
58const char SessionDescriptionInterface::kPrAnswer[] = "pranswer";
59const char SessionDescriptionInterface::kAnswer[] = "answer";
60
61const int JsepSessionDescription::kDefaultVideoCodecId = 100;
62// This is effectively a max value of the frame rate. 30 is default from camera.
63const int JsepSessionDescription::kDefaultVideoCodecFramerate = 60;
64const char JsepSessionDescription::kDefaultVideoCodecName[] = "VP8";
65// Used as default max video codec size before we have it in signaling.
66#if defined(ANDROID) || defined(WEBRTC_IOS)
67// Limit default max video codec size for Android to avoid
68// HW VP8 codec initialization failure for resolutions higher
69// than 1280x720 or 720x1280.
70// Same patch for iOS to support 720P in portrait mode.
71const int JsepSessionDescription::kMaxVideoCodecWidth = 1280;
72const int JsepSessionDescription::kMaxVideoCodecHeight = 1280;
73#else
74const int JsepSessionDescription::kMaxVideoCodecWidth = 1920;
75const int JsepSessionDescription::kMaxVideoCodecHeight = 1080;
76#endif
77const int JsepSessionDescription::kDefaultVideoCodecPreference = 1;
78
79SessionDescriptionInterface* CreateSessionDescription(const std::string& type,
80                                                      const std::string& sdp,
81                                                      SdpParseError* error) {
82  if (!IsTypeSupported(type)) {
83    return NULL;
84  }
85
86  JsepSessionDescription* jsep_desc = new JsepSessionDescription(type);
87  if (!jsep_desc->Initialize(sdp, error)) {
88    delete jsep_desc;
89    return NULL;
90  }
91  return jsep_desc;
92}
93
94JsepSessionDescription::JsepSessionDescription(const std::string& type)
95    : type_(type) {
96}
97
98JsepSessionDescription::~JsepSessionDescription() {}
99
100bool JsepSessionDescription::Initialize(
101    cricket::SessionDescription* description,
102    const std::string& session_id,
103    const std::string& session_version) {
104  if (!description)
105    return false;
106
107  session_id_ = session_id;
108  session_version_ = session_version;
109  description_.reset(description);
110  candidate_collection_.resize(number_of_mediasections());
111  return true;
112}
113
114bool JsepSessionDescription::Initialize(const std::string& sdp,
115                                        SdpParseError* error) {
116  return SdpDeserialize(sdp, this, error);
117}
118
119bool JsepSessionDescription::AddCandidate(
120    const IceCandidateInterface* candidate) {
121  if (!candidate || candidate->sdp_mline_index() < 0)
122    return false;
123  size_t mediasection_index = 0;
124  if (!GetMediasectionIndex(candidate, &mediasection_index)) {
125    return false;
126  }
127  if (mediasection_index >= number_of_mediasections())
128    return false;
129  const std::string& content_name =
130      description_->contents()[mediasection_index].name;
131  const cricket::TransportInfo* transport_info =
132      description_->GetTransportInfoByName(content_name);
133  if (!transport_info) {
134    return false;
135  }
136
137  cricket::Candidate updated_candidate = candidate->candidate();
138  if (updated_candidate.username().empty()) {
139    updated_candidate.set_username(transport_info->description.ice_ufrag);
140  }
141  if (updated_candidate.password().empty()) {
142    updated_candidate.set_password(transport_info->description.ice_pwd);
143  }
144
145  scoped_ptr<JsepIceCandidate> updated_candidate_wrapper(
146      new JsepIceCandidate(candidate->sdp_mid(),
147                           static_cast<int>(mediasection_index),
148                           updated_candidate));
149  if (!candidate_collection_[mediasection_index].HasCandidate(
150          updated_candidate_wrapper.get()))
151    candidate_collection_[mediasection_index].add(
152        updated_candidate_wrapper.release());
153
154  return true;
155}
156
157size_t JsepSessionDescription::number_of_mediasections() const {
158  if (!description_)
159    return 0;
160  return description_->contents().size();
161}
162
163const IceCandidateCollection* JsepSessionDescription::candidates(
164    size_t mediasection_index) const {
165  if (mediasection_index >= candidate_collection_.size())
166    return NULL;
167  return &candidate_collection_[mediasection_index];
168}
169
170bool JsepSessionDescription::ToString(std::string* out) const {
171  if (!description_ || !out)
172    return false;
173  *out = SdpSerialize(*this);
174  return !out->empty();
175}
176
177bool JsepSessionDescription::GetMediasectionIndex(
178    const IceCandidateInterface* candidate,
179    size_t* index) {
180  if (!candidate || !index) {
181    return false;
182  }
183  *index = static_cast<size_t>(candidate->sdp_mline_index());
184  if (description_ && !candidate->sdp_mid().empty()) {
185    bool found = false;
186    // Try to match the sdp_mid with content name.
187    for (size_t i = 0; i < description_->contents().size(); ++i) {
188      if (candidate->sdp_mid() == description_->contents().at(i).name) {
189        *index = i;
190        found = true;
191        break;
192      }
193    }
194    if (!found) {
195      // If the sdp_mid is presented but we can't find a match, we consider
196      // this as an error.
197      return false;
198    }
199  }
200  return true;
201}
202
203}  // namespace webrtc
204