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/*
* Copyright 2012 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "webrtc/api/jsepsessiondescription.h"
#include <memory>
#include "webrtc/api/webrtcsdp.h"
#include "webrtc/base/arraysize.h"
#include "webrtc/base/stringencode.h"
#include "webrtc/pc/mediasession.h"
using cricket::SessionDescription;
namespace webrtc {
static const char* kSupportedTypes[] = {
JsepSessionDescription::kOffer,
JsepSessionDescription::kPrAnswer,
JsepSessionDescription::kAnswer
};
static bool IsTypeSupported(const std::string& type) {
bool type_supported = false;
for (size_t i = 0; i < arraysize(kSupportedTypes); ++i) {
if (kSupportedTypes[i] == type) {
type_supported = true;
break;
}
}
return type_supported;
}
const char SessionDescriptionInterface::kOffer[] = "offer";
const char SessionDescriptionInterface::kPrAnswer[] = "pranswer";
const char SessionDescriptionInterface::kAnswer[] = "answer";
const int JsepSessionDescription::kDefaultVideoCodecId = 100;
const char JsepSessionDescription::kDefaultVideoCodecName[] = "VP8";
SessionDescriptionInterface* CreateSessionDescription(const std::string& type,
const std::string& sdp,
SdpParseError* error) {
if (!IsTypeSupported(type)) {
return NULL;
}
JsepSessionDescription* jsep_desc = new JsepSessionDescription(type);
if (!jsep_desc->Initialize(sdp, error)) {
delete jsep_desc;
return NULL;
}
return jsep_desc;
}
JsepSessionDescription::JsepSessionDescription(const std::string& type)
: type_(type) {
}
JsepSessionDescription::~JsepSessionDescription() {}
bool JsepSessionDescription::Initialize(
cricket::SessionDescription* description,
const std::string& session_id,
const std::string& session_version) {
if (!description)
return false;
session_id_ = session_id;
session_version_ = session_version;
description_.reset(description);
candidate_collection_.resize(number_of_mediasections());
return true;
}
bool JsepSessionDescription::Initialize(const std::string& sdp,
SdpParseError* error) {
return SdpDeserialize(sdp, this, error);
}
bool JsepSessionDescription::AddCandidate(
const IceCandidateInterface* candidate) {
if (!candidate || candidate->sdp_mline_index() < 0)
return false;
size_t mediasection_index = 0;
if (!GetMediasectionIndex(candidate, &mediasection_index)) {
return false;
}
if (mediasection_index >= number_of_mediasections())
return false;
const std::string& content_name =
description_->contents()[mediasection_index].name;
const cricket::TransportInfo* transport_info =
description_->GetTransportInfoByName(content_name);
if (!transport_info) {
return false;
}
cricket::Candidate updated_candidate = candidate->candidate();
if (updated_candidate.username().empty()) {
updated_candidate.set_username(transport_info->description.ice_ufrag);
}
if (updated_candidate.password().empty()) {
updated_candidate.set_password(transport_info->description.ice_pwd);
}
std::unique_ptr<JsepIceCandidate> updated_candidate_wrapper(
new JsepIceCandidate(candidate->sdp_mid(),
static_cast<int>(mediasection_index),
updated_candidate));
if (!candidate_collection_[mediasection_index].HasCandidate(
updated_candidate_wrapper.get()))
candidate_collection_[mediasection_index].add(
updated_candidate_wrapper.release());
return true;
}
size_t JsepSessionDescription::RemoveCandidates(
const std::vector<cricket::Candidate>& candidates) {
size_t num_removed = 0;
for (auto& candidate : candidates) {
int mediasection_index = GetMediasectionIndex(candidate);
if (mediasection_index < 0) {
// Not found.
continue;
}
num_removed += candidate_collection_[mediasection_index].remove(candidate);
}
return num_removed;
}
size_t JsepSessionDescription::number_of_mediasections() const {
if (!description_)
return 0;
return description_->contents().size();
}
const IceCandidateCollection* JsepSessionDescription::candidates(
size_t mediasection_index) const {
if (mediasection_index >= candidate_collection_.size())
return NULL;
return &candidate_collection_[mediasection_index];
}
bool JsepSessionDescription::ToString(std::string* out) const {
if (!description_ || !out) {
return false;
}
*out = SdpSerialize(*this, false);
return !out->empty();
}
bool JsepSessionDescription::GetMediasectionIndex(
const IceCandidateInterface* candidate,
size_t* index) {
if (!candidate || !index) {
return false;
}
*index = static_cast<size_t>(candidate->sdp_mline_index());
if (description_ && !candidate->sdp_mid().empty()) {
bool found = false;
// Try to match the sdp_mid with content name.
for (size_t i = 0; i < description_->contents().size(); ++i) {
if (candidate->sdp_mid() == description_->contents().at(i).name) {
*index = i;
found = true;
break;
}
}
if (!found) {
// If the sdp_mid is presented but we can't find a match, we consider
// this as an error.
return false;
}
}
return true;
}
int JsepSessionDescription::GetMediasectionIndex(
const cricket::Candidate& candidate) {
// Find the description with a matching transport name of the candidate.
const std::string& transport_name = candidate.transport_name();
for (size_t i = 0; i < description_->contents().size(); ++i) {
if (transport_name == description_->contents().at(i).name) {
return static_cast<int>(i);
}
}
return -1;
}
} // namespace webrtc
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