blob: 5e6a1cb2038a08779f814daa16714970f97ec253 [file] [log] [blame]
/*
* 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 "api/jsepsessiondescription.h"
#include <memory>
#include "p2p/base/port.h"
#include "pc/mediasession.h"
#include "pc/webrtcsdp.h"
#include "rtc_base/arraysize.h"
#include "rtc_base/ptr_util.h"
#include "rtc_base/stringencode.h"
using cricket::SessionDescription;
namespace webrtc {
namespace {
// RFC 5245
// It is RECOMMENDED that default candidates be chosen based on the
// likelihood of those candidates to work with the peer that is being
// contacted. It is RECOMMENDED that relayed > reflexive > host.
constexpr int kPreferenceUnknown = 0;
constexpr int kPreferenceHost = 1;
constexpr int kPreferenceReflexive = 2;
constexpr int kPreferenceRelayed = 3;
constexpr char kDummyAddress[] = "0.0.0.0";
constexpr int kDummyPort = 9;
int GetCandidatePreferenceFromType(const std::string& type) {
int preference = kPreferenceUnknown;
if (type == cricket::LOCAL_PORT_TYPE) {
preference = kPreferenceHost;
} else if (type == cricket::STUN_PORT_TYPE) {
preference = kPreferenceReflexive;
} else if (type == cricket::RELAY_PORT_TYPE) {
preference = kPreferenceRelayed;
} else {
preference = kPreferenceUnknown;
}
return preference;
}
// Update the connection address for the MediaContentDescription based on the
// candidates.
void UpdateConnectionAddress(
const JsepCandidateCollection& candidate_collection,
cricket::ContentDescription* content_description) {
int port = kDummyPort;
std::string ip = kDummyAddress;
int current_preference = kPreferenceUnknown;
int current_family = AF_UNSPEC;
for (size_t i = 0; i < candidate_collection.count(); ++i) {
const IceCandidateInterface* jsep_candidate = candidate_collection.at(i);
if (jsep_candidate->candidate().component() !=
cricket::ICE_CANDIDATE_COMPONENT_RTP) {
continue;
}
// Default destination should be UDP only.
if (jsep_candidate->candidate().protocol() != cricket::UDP_PROTOCOL_NAME) {
continue;
}
const int preference =
GetCandidatePreferenceFromType(jsep_candidate->candidate().type());
const int family = jsep_candidate->candidate().address().ipaddr().family();
// See if this candidate is more preferable then the current one if it's the
// same family. Or if the current family is IPv4 already so we could safely
// ignore all IPv6 ones. WebRTC bug 4269.
// http://code.google.com/p/webrtc/issues/detail?id=4269
if ((preference <= current_preference && current_family == family) ||
(current_family == AF_INET && family == AF_INET6)) {
continue;
}
current_preference = preference;
current_family = family;
port = jsep_candidate->candidate().address().port();
ip = jsep_candidate->candidate().address().ipaddr().ToString();
}
rtc::SocketAddress connection_addr;
connection_addr.SetIP(ip);
connection_addr.SetPort(port);
static_cast<cricket::MediaContentDescription*>(content_description)
->set_connection_address(connection_addr);
}
} // namespace
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";
const char* SdpTypeToString(SdpType type) {
switch (type) {
case SdpType::kOffer:
return SessionDescriptionInterface::kOffer;
case SdpType::kPrAnswer:
return SessionDescriptionInterface::kPrAnswer;
case SdpType::kAnswer:
return SessionDescriptionInterface::kAnswer;
}
return "";
}
rtc::Optional<SdpType> SdpTypeFromString(const std::string& type_str) {
if (type_str == SessionDescriptionInterface::kOffer) {
return SdpType::kOffer;
} else if (type_str == SessionDescriptionInterface::kPrAnswer) {
return SdpType::kPrAnswer;
} else if (type_str == SessionDescriptionInterface::kAnswer) {
return SdpType::kAnswer;
} else {
return rtc::nullopt;
}
}
// TODO(steveanton): Remove this default implementation once Chromium has been
// updated.
SdpType SessionDescriptionInterface::GetType() const {
rtc::Optional<SdpType> maybe_type = SdpTypeFromString(type());
if (maybe_type) {
return *maybe_type;
} else {
RTC_LOG(LS_WARNING) << "Default implementation of "
"SessionDescriptionInterface::GetType does not "
"recognize the result from type(), returning "
"kOffer.";
return SdpType::kOffer;
}
}
SessionDescriptionInterface* CreateSessionDescription(const std::string& type,
const std::string& sdp,
SdpParseError* error) {
rtc::Optional<SdpType> maybe_type = SdpTypeFromString(type);
if (!maybe_type) {
return nullptr;
}
return CreateSessionDescription(*maybe_type, sdp, error).release();
}
std::unique_ptr<SessionDescriptionInterface> CreateSessionDescription(
SdpType type,
const std::string& sdp) {
return CreateSessionDescription(type, sdp, nullptr);
}
std::unique_ptr<SessionDescriptionInterface> CreateSessionDescription(
SdpType type,
const std::string& sdp,
SdpParseError* error_out) {
auto jsep_desc = rtc::MakeUnique<JsepSessionDescription>(type);
if (!SdpDeserialize(sdp, jsep_desc.get(), error_out)) {
return nullptr;
}
return std::move(jsep_desc);
}
JsepSessionDescription::JsepSessionDescription(SdpType type) : type_(type) {}
JsepSessionDescription::JsepSessionDescription(const std::string& type) {
rtc::Optional<SdpType> maybe_type = SdpTypeFromString(type);
if (maybe_type) {
type_ = *maybe_type;
} else {
RTC_LOG(LS_WARNING)
<< "JsepSessionDescription constructed with invalid type string: "
<< type << ". Assuming it is an offer.";
type_ = SdpType::kOffer;
}
}
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::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());
UpdateConnectionAddress(
candidate_collection_[mediasection_index],
description_->contents()[mediasection_index].description);
}
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);
UpdateConnectionAddress(
candidate_collection_[mediasection_index],
description_->contents()[mediasection_index].description);
}
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