/*
* Copyright 2004 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 <utility>
#include "webrtc/pc/channel.h"
#include "webrtc/audio_sink.h"
#include "webrtc/base/bind.h"
#include "webrtc/base/byteorder.h"
#include "webrtc/base/common.h"
#include "webrtc/base/copyonwritebuffer.h"
#include "webrtc/base/dscp.h"
#include "webrtc/base/logging.h"
#include "webrtc/base/networkroute.h"
#include "webrtc/base/trace_event.h"
#include "webrtc/media/base/mediaconstants.h"
#include "webrtc/media/base/rtputils.h"
#include "webrtc/p2p/base/transportchannel.h"
#include "webrtc/pc/channelmanager.h"
namespace cricket {
using rtc::Bind;
namespace {
// See comment below for why we need to use a pointer to a unique_ptr.
bool SetRawAudioSink_w(VoiceMediaChannel* channel,
uint32_t ssrc,
std::unique_ptr<webrtc::AudioSinkInterface>* sink) {
channel->SetRawAudioSink(ssrc, std::move(*sink));
return true;
}
struct SendPacketMessageData : public rtc::MessageData {
rtc::CopyOnWriteBuffer packet;
rtc::PacketOptions options;
};
#if defined(ENABLE_EXTERNAL_AUTH)
// Returns the named header extension if found among all extensions,
// nullptr otherwise.
const webrtc::RtpExtension* FindHeaderExtension(
const std::vector<webrtc::RtpExtension>& extensions,
const std::string& uri) {
for (const auto& extension : extensions) {
if (extension.uri == uri)
return &extension;
}
return nullptr;
}
#endif
} // namespace
enum {
MSG_EARLYMEDIATIMEOUT = 1,
MSG_SEND_RTP_PACKET,
MSG_SEND_RTCP_PACKET,
MSG_CHANNEL_ERROR,
MSG_READYTOSENDDATA,
MSG_DATARECEIVED,
MSG_FIRSTPACKETRECEIVED,
MSG_STREAMCLOSEDREMOTELY,
};
// Value specified in RFC 5764.
static const char kDtlsSrtpExporterLabel[] = "EXTRACTOR-dtls_srtp";
static const int kAgcMinus10db = -10;
static void SafeSetError(const std::string& message, std::string* error_desc) {
if (error_desc) {
*error_desc = message;
}
}
struct VoiceChannelErrorMessageData : public rtc::MessageData {
VoiceChannelErrorMessageData(uint32_t in_ssrc,
VoiceMediaChannel::Error in_error)
: ssrc(in_ssrc), error(in_error) {}
uint32_t ssrc;
VoiceMediaChannel::Error error;
};
struct VideoChannelErrorMessageData : public rtc::MessageData {
VideoChannelErrorMessageData(uint32_t in_ssrc,
VideoMediaChannel::Error in_error)
: ssrc(in_ssrc), error(in_error) {}
uint32_t ssrc;
VideoMediaChannel::Error error;
};
struct DataChannelErrorMessageData : public rtc::MessageData {
DataChannelErrorMessageData(uint32_t in_ssrc,
DataMediaChannel::Error in_error)
: ssrc(in_ssrc), error(in_error) {}
uint32_t ssrc;
DataMediaChannel::Error error;
};
static const char* PacketType(bool rtcp) {
return (!rtcp) ? "RTP" : "RTCP";
}
static bool ValidPacket(bool rtcp, const rtc::CopyOnWriteBuffer* packet) {
// Check the packet size. We could check the header too if needed.
return (packet &&
packet->size() >= (!rtcp ? kMinRtpPacketLen : kMinRtcpPacketLen) &&
packet->size() <= kMaxRtpPacketLen);
}
static bool IsReceiveContentDirection(MediaContentDirection direction) {
return direction == MD_SENDRECV || direction == MD_RECVONLY;
}
static bool IsSendContentDirection(MediaContentDirection direction) {
return direction == MD_SENDRECV || direction == MD_SENDONLY;
}
static const MediaContentDescription* GetContentDescription(
const ContentInfo* cinfo) {
if (cinfo == NULL)
return NULL;
return static_cast<const MediaContentDescription*>(cinfo->description);
}
template <class Codec>
void RtpParametersFromMediaDescription(
const MediaContentDescriptionImpl<Codec>* desc,
RtpParameters<Codec>* params) {
// TODO(pthatcher): Remove this once we're sure no one will give us
// a description without codecs (currently a CA_UPDATE with just
// streams can).
if (desc->has_codecs()) {
params->codecs = desc->codecs();
}
// TODO(pthatcher): See if we really need
// rtp_header_extensions_set() and remove it if we don't.
if (desc->rtp_header_extensions_set()) {
params->extensions = desc->rtp_header_extensions();
}
params->rtcp.reduced_size = desc->rtcp_reduced_size();
}
template <class Codec>
void RtpSendParametersFromMediaDescription(
const MediaContentDescriptionImpl<Codec>* desc,
RtpSendParameters<Codec>* send_params) {
RtpParametersFromMediaDescription(desc, send_params);
send_params->max_bandwidth_bps = desc->bandwidth();
}
BaseChannel::BaseChannel(rtc::Thread* worker_thread,
rtc::Thread* network_thread,
MediaChannel* media_channel,
TransportController* transport_controller,
const std::string& content_name,
bool rtcp)
: worker_thread_(worker_thread),
network_thread_(network_thread),
content_name_(content_name),
transport_controller_(transport_controller),
rtcp_transport_enabled_(rtcp),
transport_channel_(nullptr),
rtcp_transport_channel_(nullptr),
rtp_ready_to_send_(false),
rtcp_ready_to_send_(false),
writable_(false),
was_ever_writable_(false),
has_received_packet_(false),
dtls_keyed_(false),
secure_required_(false),
rtp_abs_sendtime_extn_id_(-1),
media_channel_(media_channel),
enabled_(false),
local_content_direction_(MD_INACTIVE),
remote_content_direction_(MD_INACTIVE) {
ASSERT(worker_thread_ == rtc::Thread::Current());
if (transport_controller) {
RTC_DCHECK_EQ(network_thread, transport_controller->network_thread());
}
LOG(LS_INFO) << "Created channel for " << content_name;
}
BaseChannel::~BaseChannel() {
TRACE_EVENT0("webrtc", "BaseChannel::~BaseChannel");
ASSERT(worker_thread_ == rtc::Thread::Current());
Deinit();
StopConnectionMonitor();
// Eats any outstanding messages or packets.
worker_thread_->Clear(&invoker_);
worker_thread_->Clear(this);
// We must destroy the media channel before the transport channel, otherwise
// the media channel may try to send on the dead transport channel. NULLing
// is not an effective strategy since the sends will come on another thread.
delete media_channel_;
// Note that we don't just call SetTransportChannel_n(nullptr) because that
// would call a pure virtual method which we can't do from a destructor.
network_thread_->Invoke<void>(
RTC_FROM_HERE, Bind(&BaseChannel::DestroyTransportChannels_n, this));
LOG(LS_INFO) << "Destroyed channel";
}
void BaseChannel::DisconnectTransportChannels_n() {
// Send any outstanding RTCP packets.
FlushRtcpMessages_n();
// Stop signals from transport channels, but keep them alive because
// media_channel may use them from a different thread.
if (transport_channel_) {
DisconnectFromTransportChannel(transport_channel_);
}
if (rtcp_transport_channel_) {
DisconnectFromTransportChannel(rtcp_transport_channel_);
}
// Clear pending read packets/messages.
network_thread_->Clear(&invoker_);
network_thread_->Clear(this);
}
void BaseChannel::DestroyTransportChannels_n() {
if (transport_channel_) {
transport_controller_->DestroyTransportChannel_n(
transport_name_, cricket::ICE_CANDIDATE_COMPONENT_RTP);
}
if (rtcp_transport_channel_) {
transport_controller_->DestroyTransportChannel_n(
transport_name_, cricket::ICE_CANDIDATE_COMPONENT_RTCP);
}
// Clear pending send packets/messages.
network_thread_->Clear(&invoker_);
network_thread_->Clear(this);
}
bool BaseChannel::Init_w(const std::string* bundle_transport_name) {
if (!network_thread_->Invoke<bool>(
RTC_FROM_HERE,
Bind(&BaseChannel::InitNetwork_n, this, bundle_transport_name))) {
return false;
}
// Both RTP and RTCP channels are set, we can call SetInterface on
// media channel and it can set network options.
RTC_DCHECK(worker_thread_->IsCurrent());
media_channel_->SetInterface(this);
return true;
}
bool BaseChannel::InitNetwork_n(const std::string* bundle_transport_name) {
RTC_DCHECK(network_thread_->IsCurrent());
const std::string& transport_name =
(bundle_transport_name ? *bundle_transport_name : content_name());
if (!SetTransport_n(transport_name)) {
return false;
}
if (!SetDtlsSrtpCryptoSuites_n(transport_channel_, false)) {
return false;
}
if (rtcp_transport_enabled() &&
!SetDtlsSrtpCryptoSuites_n(rtcp_transport_channel_, true)) {
return false;
}
return true;
}
void BaseChannel::Deinit() {
RTC_DCHECK(worker_thread_->IsCurrent());
media_channel_->SetInterface(NULL);
// Packets arrive on the network thread, processing packets calls virtual
// functions, so need to stop this process in Deinit that is called in
// derived classes destructor.
network_thread_->Invoke<void>(
RTC_FROM_HERE, Bind(&BaseChannel::DisconnectTransportChannels_n, this));
}
bool BaseChannel::SetTransport(const std::string& transport_name) {
return network_thread_->Invoke<bool>(
RTC_FROM_HERE, Bind(&BaseChannel::SetTransport_n, this, transport_name));
}
bool BaseChannel::SetTransport_n(const std::string& transport_name) {
RTC_DCHECK(network_thread_->IsCurrent());
if (transport_name == transport_name_) {
// Nothing to do if transport name isn't changing
return true;
}
// When using DTLS-SRTP, we must reset the SrtpFilter every time the transport
// changes and wait until the DTLS handshake is complete to set the newly
// negotiated parameters.
if (ShouldSetupDtlsSrtp_n()) {
// Set |writable_| to false such that UpdateWritableState_w can set up
// DTLS-SRTP when the writable_ becomes true again.
writable_ = false;
srtp_filter_.ResetParams();
}
// TODO(guoweis): Remove this grossness when we remove non-muxed RTCP.
if (rtcp_transport_enabled()) {
LOG(LS_INFO) << "Create RTCP TransportChannel for " << content_name()
<< " on " << transport_name << " transport ";
SetRtcpTransportChannel_n(
transport_controller_->CreateTransportChannel_n(
transport_name, cricket::ICE_CANDIDATE_COMPONENT_RTCP),
false /* update_writablity */);
if (!rtcp_transport_channel_) {
return false;
}
}
// We're not updating the writablity during the transition state.
SetTransportChannel_n(transport_controller_->CreateTransportChannel_n(
transport_name, cricket::ICE_CANDIDATE_COMPONENT_RTP));
if (!transport_channel_) {
return false;
}
// TODO(guoweis): Remove this grossness when we remove non-muxed RTCP.
if (rtcp_transport_enabled()) {
// We can only update the RTCP ready to send after set_transport_channel has
// handled channel writability.
SetReadyToSend(
true, rtcp_transport_channel_ && rtcp_transport_channel_->writable());
}
transport_name_ = transport_name;
return true;
}
void BaseChannel::SetTransportChannel_n(TransportChannel* new_tc) {
RTC_DCHECK(network_thread_->IsCurrent());
TransportChannel* old_tc = transport_channel_;
if (!old_tc && !new_tc) {
// Nothing to do
return;
}
ASSERT(old_tc != new_tc);
if (old_tc) {
DisconnectFromTransportChannel(old_tc);
transport_controller_->DestroyTransportChannel_n(
transport_name_, cricket::ICE_CANDIDATE_COMPONENT_RTP);
}
transport_channel_ = new_tc;
if (new_tc) {
ConnectToTransportChannel(new_tc);
for (const auto& pair : socket_options_) {
new_tc->SetOption(pair.first, pair.second);
}
}
// Update aggregate writable/ready-to-send state between RTP and RTCP upon
// setting new channel
UpdateWritableState_n();
SetReadyToSend(false, new_tc && new_tc->writable());
}
void BaseChannel::SetRtcpTransportChannel_n(TransportChannel* new_tc,
bool update_writablity) {
RTC_DCHECK(network_thread_->IsCurrent());
TransportChannel* old_tc = rtcp_transport_channel_;
if (!old_tc && !new_tc) {
// Nothing to do
return;
}
ASSERT(old_tc != new_tc);
if (old_tc) {
DisconnectFromTransportChannel(old_tc);
transport_controller_->DestroyTransportChannel_n(
transport_name_, cricket::ICE_CANDIDATE_COMPONENT_RTCP);
}
rtcp_transport_channel_ = new_tc;
if (new_tc) {
RTC_CHECK(!(ShouldSetupDtlsSrtp_n() && srtp_filter_.IsActive()))
<< "Setting RTCP for DTLS/SRTP after SrtpFilter is active "
<< "should never happen.";
ConnectToTransportChannel(new_tc);
for (const auto& pair : rtcp_socket_options_) {
new_tc->SetOption(pair.first, pair.second);
}
}
if (update_writablity) {
// Update aggregate writable/ready-to-send state between RTP and RTCP upon
// setting new channel
UpdateWritableState_n();
SetReadyToSend(true, new_tc && new_tc->writable());
}
}
void BaseChannel::ConnectToTransportChannel(TransportChannel* tc) {
RTC_DCHECK(network_thread_->IsCurrent());
tc->SignalWritableState.connect(this, &BaseChannel::OnWritableState);
tc->SignalReadPacket.connect(this, &BaseChannel::OnChannelRead);
tc->SignalReadyToSend.connect(this, &BaseChannel::OnReadyToSend);
tc->SignalDtlsState.connect(this, &BaseChannel::OnDtlsState);
tc->SignalSelectedCandidatePairChanged.connect(
this, &BaseChannel::OnSelectedCandidatePairChanged);
tc->SignalSentPacket.connect(this, &BaseChannel::SignalSentPacket_n);
}
void BaseChannel::DisconnectFromTransportChannel(TransportChannel* tc) {
RTC_DCHECK(network_thread_->IsCurrent());
tc->SignalWritableState.disconnect(this);
tc->SignalReadPacket.disconnect(this);
tc->SignalReadyToSend.disconnect(this);
tc->SignalDtlsState.disconnect(this);
tc->SignalSelectedCandidatePairChanged.disconnect(this);
tc->SignalSentPacket.disconnect(this);
}
bool BaseChannel::Enable(bool enable) {
worker_thread_->Invoke<void>(
RTC_FROM_HERE,
Bind(enable ? &BaseChannel::EnableMedia_w : &BaseChannel::DisableMedia_w,
this));
return true;
}
bool BaseChannel::AddRecvStream(const StreamParams& sp) {
return InvokeOnWorker(RTC_FROM_HERE,
Bind(&BaseChannel::AddRecvStream_w, this, sp));
}
bool BaseChannel::RemoveRecvStream(uint32_t ssrc) {
return InvokeOnWorker(RTC_FROM_HERE,
Bind(&BaseChannel::RemoveRecvStream_w, this, ssrc));
}
bool BaseChannel::AddSendStream(const StreamParams& sp) {
return InvokeOnWorker(
RTC_FROM_HERE, Bind(&MediaChannel::AddSendStream, media_channel(), sp));
}
bool BaseChannel::RemoveSendStream(uint32_t ssrc) {
return InvokeOnWorker(RTC_FROM_HERE, Bind(&MediaChannel::RemoveSendStream,
media_channel(), ssrc));
}
bool BaseChannel::SetLocalContent(const MediaContentDescription* content,
ContentAction action,
std::string* error_desc) {
TRACE_EVENT0("webrtc", "BaseChannel::SetLocalContent");
return InvokeOnWorker(RTC_FROM_HERE, Bind(&BaseChannel::SetLocalContent_w,
this, content, action, error_desc));
}
bool BaseChannel::SetRemoteContent(const MediaContentDescription* content,
ContentAction action,
std::string* error_desc) {
TRACE_EVENT0("webrtc", "BaseChannel::SetRemoteContent");
return InvokeOnWorker(RTC_FROM_HERE, Bind(&BaseChannel::SetRemoteContent_w,
this, content, action, error_desc));
}
void BaseChannel::StartConnectionMonitor(int cms) {
// We pass in the BaseChannel instead of the transport_channel_
// because if the transport_channel_ changes, the ConnectionMonitor
// would be pointing to the wrong TransportChannel.
// We pass in the network thread because on that thread connection monitor
// will call BaseChannel::GetConnectionStats which must be called on the
// network thread.
connection_monitor_.reset(
new ConnectionMonitor(this, network_thread(), rtc::Thread::Current()));
connection_monitor_->SignalUpdate.connect(
this, &BaseChannel::OnConnectionMonitorUpdate);
connection_monitor_->Start(cms);
}
void BaseChannel::StopConnectionMonitor() {
if (connection_monitor_) {
connection_monitor_->Stop();
connection_monitor_.reset();
}
}
bool BaseChannel::GetConnectionStats(ConnectionInfos* infos) {
RTC_DCHECK(network_thread_->IsCurrent());
return transport_channel_->GetStats(infos);
}
bool BaseChannel::IsReadyToReceive_w() const {
// Receive data if we are enabled and have local content,
return enabled() && IsReceiveContentDirection(local_content_direction_);
}
bool BaseChannel::IsReadyToSend_w() const {
// Send outgoing data if we are enabled, have local and remote content,
// and we have had some form of connectivity.
return enabled() && IsReceiveContentDirection(remote_content_direction_) &&
IsSendContentDirection(local_content_direction_) &&
network_thread_->Invoke<bool>(
RTC_FROM_HERE, Bind(&BaseChannel::IsTransportReadyToSend_n, this));
}
bool BaseChannel::IsTransportReadyToSend_n() const {
return was_ever_writable() &&
(srtp_filter_.IsActive() || !ShouldSetupDtlsSrtp_n());
}
bool BaseChannel::SendPacket(rtc::CopyOnWriteBuffer* packet,
const rtc::PacketOptions& options) {
return SendPacket(false, packet, options);
}
bool BaseChannel::SendRtcp(rtc::CopyOnWriteBuffer* packet,
const rtc::PacketOptions& options) {
return SendPacket(true, packet, options);
}
int BaseChannel::SetOption(SocketType type, rtc::Socket::Option opt,
int value) {
return network_thread_->Invoke<int>(
RTC_FROM_HERE, Bind(&BaseChannel::SetOption_n, this, type, opt, value));
}
int BaseChannel::SetOption_n(SocketType type,
rtc::Socket::Option opt,
int value) {
RTC_DCHECK(network_thread_->IsCurrent());
TransportChannel* channel = nullptr;
switch (type) {
case ST_RTP:
channel = transport_channel_;
socket_options_.push_back(
std::pair<rtc::Socket::Option, int>(opt, value));
break;
case ST_RTCP:
channel = rtcp_transport_channel_;
rtcp_socket_options_.push_back(
std::pair<rtc::Socket::Option, int>(opt, value));
break;
}
return channel ? channel->SetOption(opt, value) : -1;
}
void BaseChannel::OnWritableState(TransportChannel* channel) {
RTC_DCHECK(channel == transport_channel_ ||
channel == rtcp_transport_channel_);
RTC_DCHECK(network_thread_->IsCurrent());
UpdateWritableState_n();
}
void BaseChannel::OnChannelRead(TransportChannel* channel,
const char* data, size_t len,
const rtc::PacketTime& packet_time,
int flags) {
TRACE_EVENT0("webrtc", "BaseChannel::OnChannelRead");
// OnChannelRead gets called from P2PSocket; now pass data to MediaEngine
RTC_DCHECK(network_thread_->IsCurrent());
// When using RTCP multiplexing we might get RTCP packets on the RTP
// transport. We feed RTP traffic into the demuxer to determine if it is RTCP.
bool rtcp = PacketIsRtcp(channel, data, len);
rtc::CopyOnWriteBuffer packet(data, len);
HandlePacket(rtcp, &packet, packet_time);
}
void BaseChannel::OnReadyToSend(TransportChannel* channel) {
ASSERT(channel == transport_channel_ || channel == rtcp_transport_channel_);
SetReadyToSend(channel == rtcp_transport_channel_, true);
}
void BaseChannel::OnDtlsState(TransportChannel* channel,
DtlsTransportState state) {
if (!ShouldSetupDtlsSrtp_n()) {
return;
}
// Reset the srtp filter if it's not the CONNECTED state. For the CONNECTED
// state, setting up DTLS-SRTP context is deferred to ChannelWritable_w to
// cover other scenarios like the whole channel is writable (not just this
// TransportChannel) or when TransportChannel is attached after DTLS is
// negotiated.
if (state != DTLS_TRANSPORT_CONNECTED) {
srtp_filter_.ResetParams();
}
}
void BaseChannel::OnSelectedCandidatePairChanged(
TransportChannel* channel,
CandidatePairInterface* selected_candidate_pair,
int last_sent_packet_id) {
ASSERT(channel == transport_channel_ || channel == rtcp_transport_channel_);
RTC_DCHECK(network_thread_->IsCurrent());
std::string transport_name = channel->transport_name();
rtc::NetworkRoute network_route;
if (selected_candidate_pair) {
network_route = rtc::NetworkRoute(
selected_candidate_pair->local_candidate().network_id(),
selected_candidate_pair->remote_candidate().network_id(),
last_sent_packet_id);
}
invoker_.AsyncInvoke<void>(
RTC_FROM_HERE, worker_thread_,
Bind(&MediaChannel::OnNetworkRouteChanged, media_channel_, transport_name,
network_route));
}
void BaseChannel::SetReadyToSend(bool rtcp, bool ready) {
RTC_DCHECK(network_thread_->IsCurrent());
if (rtcp) {
rtcp_ready_to_send_ = ready;
} else {
rtp_ready_to_send_ = ready;
}
bool ready_to_send =
(rtp_ready_to_send_ &&
// In the case of rtcp mux |rtcp_transport_channel_| will be null.
(rtcp_ready_to_send_ || !rtcp_transport_channel_));
invoker_.AsyncInvoke<void>(
RTC_FROM_HERE, worker_thread_,
Bind(&MediaChannel::OnReadyToSend, media_channel_, ready_to_send));
}
bool BaseChannel::PacketIsRtcp(const TransportChannel* channel,
const char* data, size_t len) {
return (channel == rtcp_transport_channel_ ||
rtcp_mux_filter_.DemuxRtcp(data, static_cast<int>(len)));
}
bool BaseChannel::SendPacket(bool rtcp,
rtc::CopyOnWriteBuffer* packet,
const rtc::PacketOptions& options) {
// SendPacket gets called from MediaEngine, on a pacer or an encoder thread.
// If the thread is not our network thread, we will post to our network
// so that the real work happens on our network. This avoids us having to
// synchronize access to all the pieces of the send path, including
// SRTP and the inner workings of the transport channels.
// The only downside is that we can't return a proper failure code if
// needed. Since UDP is unreliable anyway, this should be a non-issue.
if (!network_thread_->IsCurrent()) {
// Avoid a copy by transferring the ownership of the packet data.
int message_id = rtcp ? MSG_SEND_RTCP_PACKET : MSG_SEND_RTP_PACKET;
SendPacketMessageData* data = new SendPacketMessageData;
data->packet = std::move(*packet);
data->options = options;
network_thread_->Post(RTC_FROM_HERE, this, message_id, data);
return true;
}
TRACE_EVENT0("webrtc", "BaseChannel::SendPacket");
// Now that we are on the correct thread, ensure we have a place to send this
// packet before doing anything. (We might get RTCP packets that we don't
// intend to send.) If we've negotiated RTCP mux, send RTCP over the RTP
// transport.
TransportChannel* channel = (!rtcp || rtcp_mux_filter_.IsActive()) ?
transport_channel_ : rtcp_transport_channel_;
if (!channel || !channel->writable()) {
return false;
}
// Protect ourselves against crazy data.
if (!ValidPacket(rtcp, packet)) {
LOG(LS_ERROR) << "Dropping outgoing " << content_name_ << " "
<< PacketType(rtcp)
<< " packet: wrong size=" << packet->size();
return false;
}
rtc::PacketOptions updated_options;
updated_options = options;
// Protect if needed.
if (srtp_filter_.IsActive()) {
TRACE_EVENT0("webrtc", "SRTP Encode");
bool res;
uint8_t* data = packet->data();
int len = static_cast<int>(packet->size());
if (!rtcp) {
// If ENABLE_EXTERNAL_AUTH flag is on then packet authentication is not done
// inside libsrtp for a RTP packet. A external HMAC module will be writing
// a fake HMAC value. This is ONLY done for a RTP packet.
// Socket layer will update rtp sendtime extension header if present in
// packet with current time before updating the HMAC.
#if !defined(ENABLE_EXTERNAL_AUTH)
res = srtp_filter_.ProtectRtp(
data, len, static_cast<int>(packet->capacity()), &len);
#else
updated_options.packet_time_params.rtp_sendtime_extension_id =
rtp_abs_sendtime_extn_id_;
res = srtp_filter_.ProtectRtp(
data, len, static_cast<int>(packet->capacity()), &len,
&updated_options.packet_time_params.srtp_packet_index);
// If protection succeeds, let's get auth params from srtp.
if (res) {
uint8_t* auth_key = NULL;
int key_len;
res = srtp_filter_.GetRtpAuthParams(
&auth_key, &key_len,
&updated_options.packet_time_params.srtp_auth_tag_len);
if (res) {
updated_options.packet_time_params.srtp_auth_key.resize(key_len);
updated_options.packet_time_params.srtp_auth_key.assign(
auth_key, auth_key + key_len);
}
}
#endif
if (!res) {
int seq_num = -1;
uint32_t ssrc = 0;
GetRtpSeqNum(data, len, &seq_num);
GetRtpSsrc(data, len, &ssrc);
LOG(LS_ERROR) << "Failed to protect " << content_name_
<< " RTP packet: size=" << len
<< ", seqnum=" << seq_num << ", SSRC=" << ssrc;
return false;
}
} else {
res = srtp_filter_.ProtectRtcp(data, len,
static_cast<int>(packet->capacity()),
&len);
if (!res) {
int type = -1;
GetRtcpType(data, len, &type);
LOG(LS_ERROR) << "Failed to protect " << content_name_
<< " RTCP packet: size=" << len << ", type=" << type;
return false;
}
}
// Update the length of the packet now that we've added the auth tag.
packet->SetSize(len);
} else if (secure_required_) {
// This is a double check for something that supposedly can't happen.
LOG(LS_ERROR) << "Can't send outgoing " << PacketType(rtcp)
<< " packet when SRTP is inactive and crypto is required";
ASSERT(false);
return false;
}
// Bon voyage.
int flags = (secure() && secure_dtls()) ? PF_SRTP_BYPASS : PF_NORMAL;
int ret = channel->SendPacket(packet->data<char>(), packet->size(),
updated_options, flags);
if (ret != static_cast<int>(packet->size())) {
if (channel->GetError() == EWOULDBLOCK) {
LOG(LS_WARNING) << "Got EWOULDBLOCK from socket.";
SetReadyToSend(rtcp, false);
}
return false;
}
return true;
}
bool BaseChannel::WantsPacket(bool rtcp, const rtc::CopyOnWriteBuffer* packet) {
// Protect ourselves against crazy data.
if (!ValidPacket(rtcp, packet)) {
LOG(LS_ERROR) << "Dropping incoming " << content_name_ << " "
<< PacketType(rtcp)
<< " packet: wrong size=" << packet->size();
return false;
}
if (rtcp) {
// Permit all (seemingly valid) RTCP packets.
return true;
}
// Check whether we handle this payload.
return bundle_filter_.DemuxPacket(packet->data(), packet->size());
}
void BaseChannel::HandlePacket(bool rtcp, rtc::CopyOnWriteBuffer* packet,
const rtc::PacketTime& packet_time) {
RTC_DCHECK(network_thread_->IsCurrent());
if (!WantsPacket(rtcp, packet)) {
return;
}
// We are only interested in the first rtp packet because that
// indicates the media has started flowing.
if (!has_received_packet_ && !rtcp) {
has_received_packet_ = true;
signaling_thread()->Post(RTC_FROM_HERE, this, MSG_FIRSTPACKETRECEIVED);
}
// Unprotect the packet, if needed.
if (srtp_filter_.IsActive()) {
TRACE_EVENT0("webrtc", "SRTP Decode");
char* data = packet->data<char>();
int len = static_cast<int>(packet->size());
bool res;
if (!rtcp) {
res = srtp_filter_.UnprotectRtp(data, len, &len);
if (!res) {
int seq_num = -1;
uint32_t ssrc = 0;
GetRtpSeqNum(data, len, &seq_num);
GetRtpSsrc(data, len, &ssrc);
LOG(LS_ERROR) << "Failed to unprotect " << content_name_
<< " RTP packet: size=" << len
<< ", seqnum=" << seq_num << ", SSRC=" << ssrc;
return;
}
} else {
res = srtp_filter_.UnprotectRtcp(data, len, &len);
if (!res) {
int type = -1;
GetRtcpType(data, len, &type);
LOG(LS_ERROR) << "Failed to unprotect " << content_name_
<< " RTCP packet: size=" << len << ", type=" << type;
return;
}
}
packet->SetSize(len);
} else if (secure_required_) {
// Our session description indicates that SRTP is required, but we got a
// packet before our SRTP filter is active. This means either that
// a) we got SRTP packets before we received the SDES keys, in which case
// we can't decrypt it anyway, or
// b) we got SRTP packets before DTLS completed on both the RTP and RTCP
// channels, so we haven't yet extracted keys, even if DTLS did complete
// on the channel that the packets are being sent on. It's really good
// practice to wait for both RTP and RTCP to be good to go before sending
// media, to prevent weird failure modes, so it's fine for us to just eat
// packets here. This is all sidestepped if RTCP mux is used anyway.
LOG(LS_WARNING) << "Can't process incoming " << PacketType(rtcp)
<< " packet when SRTP is inactive and crypto is required";
return;
}
invoker_.AsyncInvoke<void>(
RTC_FROM_HERE, worker_thread_,
Bind(&BaseChannel::OnPacketReceived, this, rtcp, *packet, packet_time));
}
void BaseChannel::OnPacketReceived(bool rtcp,
const rtc::CopyOnWriteBuffer& packet,
const rtc::PacketTime& packet_time) {
RTC_DCHECK(worker_thread_->IsCurrent());
// Need to copy variable because OnRtcpReceived/OnPacketReceived
// requires non-const pointer to buffer. This doesn't memcpy the actual data.
rtc::CopyOnWriteBuffer data(packet);
if (rtcp) {
media_channel_->OnRtcpReceived(&data, packet_time);
} else {
media_channel_->OnPacketReceived(&data, packet_time);
}
}
bool BaseChannel::PushdownLocalDescription(
const SessionDescription* local_desc, ContentAction action,
std::string* error_desc) {
const ContentInfo* content_info = GetFirstContent(local_desc);
const MediaContentDescription* content_desc =
GetContentDescription(content_info);
if (content_desc && content_info && !content_info->rejected &&
!SetLocalContent(content_desc, action, error_desc)) {
LOG(LS_ERROR) << "Failure in SetLocalContent with action " << action;
return false;
}
return true;
}
bool BaseChannel::PushdownRemoteDescription(
const SessionDescription* remote_desc, ContentAction action,
std::string* error_desc) {
const ContentInfo* content_info = GetFirstContent(remote_desc);
const MediaContentDescription* content_desc =
GetContentDescription(content_info);
if (content_desc && content_info && !content_info->rejected &&
!SetRemoteContent(content_desc, action, error_desc)) {
LOG(LS_ERROR) << "Failure in SetRemoteContent with action " << action;
return false;
}
return true;
}
void BaseChannel::EnableMedia_w() {
ASSERT(worker_thread_ == rtc::Thread::Current());
if (enabled_)
return;
LOG(LS_INFO) << "Channel enabled";
enabled_ = true;
ChangeState_w();
}
void BaseChannel::DisableMedia_w() {
ASSERT(worker_thread_ == rtc::Thread::Current());
if (!enabled_)
return;
LOG(LS_INFO) << "Channel disabled";
enabled_ = false;
ChangeState_w();
}
void BaseChannel::UpdateWritableState_n() {
if (transport_channel_ && transport_channel_->writable() &&
(!rtcp_transport_channel_ || rtcp_transport_channel_->writable())) {
ChannelWritable_n();
} else {
ChannelNotWritable_n();
}
}
void BaseChannel::ChannelWritable_n() {
RTC_DCHECK(network_thread_->IsCurrent());
if (writable_) {
return;
}
LOG(LS_INFO) << "Channel writable (" << content_name_ << ")"
<< (was_ever_writable_ ? "" : " for the first time");
std::vector<ConnectionInfo> infos;
transport_channel_->GetStats(&infos);
for (std::vector<ConnectionInfo>::const_iterator it = infos.begin();
it != infos.end(); ++it) {
if (it->best_connection) {
LOG(LS_INFO) << "Using " << it->local_candidate.ToSensitiveString()
<< "->" << it->remote_candidate.ToSensitiveString();
break;
}
}
was_ever_writable_ = true;
MaybeSetupDtlsSrtp_n();
writable_ = true;
ChangeState();
}
void BaseChannel::SignalDtlsSetupFailure_n(bool rtcp) {
RTC_DCHECK(network_thread_->IsCurrent());
invoker_.AsyncInvoke<void>(
RTC_FROM_HERE, signaling_thread(),
Bind(&BaseChannel::SignalDtlsSetupFailure_s, this, rtcp));
}
void BaseChannel::SignalDtlsSetupFailure_s(bool rtcp) {
ASSERT(signaling_thread() == rtc::Thread::Current());
SignalDtlsSetupFailure(this, rtcp);
}
bool BaseChannel::SetDtlsSrtpCryptoSuites_n(TransportChannel* tc, bool rtcp) {
std::vector<int> crypto_suites;
// We always use the default SRTP crypto suites for RTCP, but we may use
// different crypto suites for RTP depending on the media type.
if (!rtcp) {
GetSrtpCryptoSuites_n(&crypto_suites);
} else {
GetDefaultSrtpCryptoSuites(&crypto_suites);
}
return tc->SetSrtpCryptoSuites(crypto_suites);
}
bool BaseChannel::ShouldSetupDtlsSrtp_n() const {
// Since DTLS is applied to all channels, checking RTP should be enough.
return transport_channel_ && transport_channel_->IsDtlsActive();
}
// This function returns true if either DTLS-SRTP is not in use
// *or* DTLS-SRTP is successfully set up.
bool BaseChannel::SetupDtlsSrtp_n(bool rtcp_channel) {
RTC_DCHECK(network_thread_->IsCurrent());
bool ret = false;
TransportChannel* channel =
rtcp_channel ? rtcp_transport_channel_ : transport_channel_;
RTC_DCHECK(channel->IsDtlsActive());
int selected_crypto_suite;
if (!channel->GetSrtpCryptoSuite(&selected_crypto_suite)) {
LOG(LS_ERROR) << "No DTLS-SRTP selected crypto suite";
return false;
}
LOG(LS_INFO) << "Installing keys from DTLS-SRTP on "
<< content_name() << " "
<< PacketType(rtcp_channel);
// OK, we're now doing DTLS (RFC 5764)
std::vector<unsigned char> dtls_buffer(SRTP_MASTER_KEY_KEY_LEN * 2 +
SRTP_MASTER_KEY_SALT_LEN * 2);
// RFC 5705 exporter using the RFC 5764 parameters
if (!channel->ExportKeyingMaterial(
kDtlsSrtpExporterLabel,
NULL, 0, false,
&dtls_buffer[0], dtls_buffer.size())) {
LOG(LS_WARNING) << "DTLS-SRTP key export failed";
ASSERT(false); // This should never happen
return false;
}
// Sync up the keys with the DTLS-SRTP interface
std::vector<unsigned char> client_write_key(SRTP_MASTER_KEY_KEY_LEN +
SRTP_MASTER_KEY_SALT_LEN);
std::vector<unsigned char> server_write_key(SRTP_MASTER_KEY_KEY_LEN +
SRTP_MASTER_KEY_SALT_LEN);
size_t offset = 0;
memcpy(&client_write_key[0], &dtls_buffer[offset],
SRTP_MASTER_KEY_KEY_LEN);
offset += SRTP_MASTER_KEY_KEY_LEN;
memcpy(&server_write_key[0], &dtls_buffer[offset],
SRTP_MASTER_KEY_KEY_LEN);
offset += SRTP_MASTER_KEY_KEY_LEN;
memcpy(&client_write_key[SRTP_MASTER_KEY_KEY_LEN],
&dtls_buffer[offset], SRTP_MASTER_KEY_SALT_LEN);
offset += SRTP_MASTER_KEY_SALT_LEN;
memcpy(&server_write_key[SRTP_MASTER_KEY_KEY_LEN],
&dtls_buffer[offset], SRTP_MASTER_KEY_SALT_LEN);
std::vector<unsigned char> *send_key, *recv_key;
rtc::SSLRole role;
if (!channel->GetSslRole(&role)) {
LOG(LS_WARNING) << "GetSslRole failed";
return false;
}
if (role == rtc::SSL_SERVER) {
send_key = &server_write_key;
recv_key = &client_write_key;
} else {
send_key = &client_write_key;
recv_key = &server_write_key;
}
if (rtcp_channel) {
ret = srtp_filter_.SetRtcpParams(selected_crypto_suite, &(*send_key)[0],
static_cast<int>(send_key->size()),
selected_crypto_suite, &(*recv_key)[0],
static_cast<int>(recv_key->size()));
} else {
ret = srtp_filter_.SetRtpParams(selected_crypto_suite, &(*send_key)[0],
static_cast<int>(send_key->size()),
selected_crypto_suite, &(*recv_key)[0],
static_cast<int>(recv_key->size()));
}
if (!ret)
LOG(LS_WARNING) << "DTLS-SRTP key installation failed";
else
dtls_keyed_ = true;
return ret;
}
void BaseChannel::MaybeSetupDtlsSrtp_n() {
if (srtp_filter_.IsActive()) {
return;
}
if (!ShouldSetupDtlsSrtp_n()) {
return;
}
if (!SetupDtlsSrtp_n(false)) {
SignalDtlsSetupFailure_n(false);
return;
}
if (rtcp_transport_channel_) {
if (!SetupDtlsSrtp_n(true)) {
SignalDtlsSetupFailure_n(true);
return;
}
}
}
void BaseChannel::ChannelNotWritable_n() {
RTC_DCHECK(network_thread_->IsCurrent());
if (!writable_)
return;
LOG(LS_INFO) << "Channel not writable (" << content_name_ << ")";
writable_ = false;
ChangeState();
}
bool BaseChannel::SetRtpTransportParameters(
const MediaContentDescription* content,
ContentAction action,
ContentSource src,
std::string* error_desc) {
if (action == CA_UPDATE) {
// These parameters never get changed by a CA_UDPATE.
return true;
}
// Cache secure_required_ for belt and suspenders check on SendPacket
return network_thread_->Invoke<bool>(
RTC_FROM_HERE, Bind(&BaseChannel::SetRtpTransportParameters_n, this,
content, action, src, error_desc));
}
bool BaseChannel::SetRtpTransportParameters_n(
const MediaContentDescription* content,
ContentAction action,
ContentSource src,
std::string* error_desc) {
RTC_DCHECK(network_thread_->IsCurrent());
if (src == CS_LOCAL) {
set_secure_required(content->crypto_required() != CT_NONE);
}
if (!SetSrtp_n(content->cryptos(), action, src, error_desc)) {
return false;
}
if (!SetRtcpMux_n(content->rtcp_mux(), action, src, error_desc)) {
return false;
}
return true;
}
// |dtls| will be set to true if DTLS is active for transport channel and
// crypto is empty.
bool BaseChannel::CheckSrtpConfig_n(const std::vector<CryptoParams>& cryptos,
bool* dtls,
std::string* error_desc) {
*dtls = transport_channel_->IsDtlsActive();
if (*dtls && !cryptos.empty()) {
SafeSetError("Cryptos must be empty when DTLS is active.", error_desc);
return false;
}
return true;
}
bool BaseChannel::SetSrtp_n(const std::vector<CryptoParams>& cryptos,
ContentAction action,
ContentSource src,
std::string* error_desc) {
TRACE_EVENT0("webrtc", "BaseChannel::SetSrtp_w");
if (action == CA_UPDATE) {
// no crypto params.
return true;
}
bool ret = false;
bool dtls = false;
ret = CheckSrtpConfig_n(cryptos, &dtls, error_desc);
if (!ret) {
return false;
}
switch (action) {
case CA_OFFER:
// If DTLS is already active on the channel, we could be renegotiating
// here. We don't update the srtp filter.
if (!dtls) {
ret = srtp_filter_.SetOffer(cryptos, src);
}
break;
case CA_PRANSWER:
// If we're doing DTLS-SRTP, we don't want to update the filter
// with an answer, because we already have SRTP parameters.
if (!dtls) {
ret = srtp_filter_.SetProvisionalAnswer(cryptos, src);
}
break;
case CA_ANSWER:
// If we're doing DTLS-SRTP, we don't want to update the filter
// with an answer, because we already have SRTP parameters.
if (!dtls) {
ret = srtp_filter_.SetAnswer(cryptos, src);
}
break;
default:
break;
}
if (!ret) {
SafeSetError("Failed to setup SRTP filter.", error_desc);
return false;
}
return true;
}
void BaseChannel::ActivateRtcpMux() {
network_thread_->Invoke<void>(RTC_FROM_HERE,
Bind(&BaseChannel::ActivateRtcpMux_n, this));
}
void BaseChannel::ActivateRtcpMux_n() {
if (!rtcp_mux_filter_.IsActive()) {
rtcp_mux_filter_.SetActive();
SetRtcpTransportChannel_n(nullptr, true);
rtcp_transport_enabled_ = false;
}
}
bool BaseChannel::SetRtcpMux_n(bool enable,
ContentAction action,
ContentSource src,
std::string* error_desc) {
bool ret = false;
switch (action) {
case CA_OFFER:
ret = rtcp_mux_filter_.SetOffer(enable, src);
break;
case CA_PRANSWER:
ret = rtcp_mux_filter_.SetProvisionalAnswer(enable, src);
break;
case CA_ANSWER:
ret = rtcp_mux_filter_.SetAnswer(enable, src);
if (ret && rtcp_mux_filter_.IsActive()) {
// We activated RTCP mux, close down the RTCP transport.
LOG(LS_INFO) << "Enabling rtcp-mux for " << content_name()
<< " by destroying RTCP transport channel for "
<< transport_name();
SetRtcpTransportChannel_n(nullptr, true);
rtcp_transport_enabled_ = false;
}
break;
case CA_UPDATE:
// No RTCP mux info.
ret = true;
break;
default:
break;
}
if (!ret) {
SafeSetError("Failed to setup RTCP mux filter.", error_desc);
return false;
}
// |rtcp_mux_filter_| can be active if |action| is CA_PRANSWER or
// CA_ANSWER, but we only want to tear down the RTCP transport channel if we
// received a final answer.
if (rtcp_mux_filter_.IsActive()) {
// If the RTP transport is already writable, then so are we.
if (transport_channel_->writable()) {
ChannelWritable_n();
}
}
return true;
}
bool BaseChannel::AddRecvStream_w(const StreamParams& sp) {
ASSERT(worker_thread() == rtc::Thread::Current());
return media_channel()->AddRecvStream(sp);
}
bool BaseChannel::RemoveRecvStream_w(uint32_t ssrc) {
ASSERT(worker_thread() == rtc::Thread::Current());
return media_channel()->RemoveRecvStream(ssrc);
}
bool BaseChannel::UpdateLocalStreams_w(const std::vector<StreamParams>& streams,
ContentAction action,
std::string* error_desc) {
if (!VERIFY(action == CA_OFFER || action == CA_ANSWER ||
action == CA_PRANSWER || action == CA_UPDATE))
return false;
// If this is an update, streams only contain streams that have changed.
if (action == CA_UPDATE) {
for (StreamParamsVec::const_iterator it = streams.begin();
it != streams.end(); ++it) {
const StreamParams* existing_stream =
GetStreamByIds(local_streams_, it->groupid, it->id);
if (!existing_stream && it->has_ssrcs()) {
if (media_channel()->AddSendStream(*it)) {
local_streams_.push_back(*it);
LOG(LS_INFO) << "Add send stream ssrc: " << it->first_ssrc();
} else {
std::ostringstream desc;
desc << "Failed to add send stream ssrc: " << it->first_ssrc();
SafeSetError(desc.str(), error_desc);
return false;
}
} else if (existing_stream && !it->has_ssrcs()) {
if (!media_channel()->RemoveSendStream(existing_stream->first_ssrc())) {
std::ostringstream desc;
desc << "Failed to remove send stream with ssrc "
<< it->first_ssrc() << ".";
SafeSetError(desc.str(), error_desc);
return false;
}
RemoveStreamBySsrc(&local_streams_, existing_stream->first_ssrc());
} else {
LOG(LS_WARNING) << "Ignore unsupported stream update";
}
}
return true;
}
// Else streams are all the streams we want to send.
// Check for streams that have been removed.
bool ret = true;
for (StreamParamsVec::const_iterator it = local_streams_.begin();
it != local_streams_.end(); ++it) {
if (!GetStreamBySsrc(streams, it->first_ssrc())) {
if (!media_channel()->RemoveSendStream(it->first_ssrc())) {
std::ostringstream desc;
desc << "Failed to remove send stream with ssrc "
<< it->first_ssrc() << ".";
SafeSetError(desc.str(), error_desc);
ret = false;
}
}
}
// Check for new streams.
for (StreamParamsVec::const_iterator it = streams.begin();
it != streams.end(); ++it) {
if (!GetStreamBySsrc(local_streams_, it->first_ssrc())) {
if (media_channel()->AddSendStream(*it)) {
LOG(LS_INFO) << "Add send stream ssrc: " << it->ssrcs[0];
} else {
std::ostringstream desc;
desc << "Failed to add send stream ssrc: " << it->first_ssrc();
SafeSetError(desc.str(), error_desc);
ret = false;
}
}
}
local_streams_ = streams;
return ret;
}
bool BaseChannel::UpdateRemoteStreams_w(
const std::vector<StreamParams>& streams,
ContentAction action,
std::string* error_desc) {
if (!VERIFY(action == CA_OFFER || action == CA_ANSWER ||
action == CA_PRANSWER || action == CA_UPDATE))
return false;
// If this is an update, streams only contain streams that have changed.
if (action == CA_UPDATE) {
for (StreamParamsVec::const_iterator it = streams.begin();
it != streams.end(); ++it) {
const StreamParams* existing_stream =
GetStreamByIds(remote_streams_, it->groupid, it->id);
if (!existing_stream && it->has_ssrcs()) {
if (AddRecvStream_w(*it)) {
remote_streams_.push_back(*it);
LOG(LS_INFO) << "Add remote stream ssrc: " << it->first_ssrc();
} else {
std::ostringstream desc;
desc << "Failed to add remote stream ssrc: " << it->first_ssrc();
SafeSetError(desc.str(), error_desc);
return false;
}
} else if (existing_stream && !it->has_ssrcs()) {
if (!RemoveRecvStream_w(existing_stream->first_ssrc())) {
std::ostringstream desc;
desc << "Failed to remove remote stream with ssrc "
<< it->first_ssrc() << ".";
SafeSetError(desc.str(), error_desc);
return false;
}
RemoveStreamBySsrc(&remote_streams_, existing_stream->first_ssrc());
} else {
LOG(LS_WARNING) << "Ignore unsupported stream update."
<< " Stream exists? " << (existing_stream != nullptr)
<< " new stream = " << it->ToString();
}
}
return true;
}
// Else streams are all the streams we want to receive.
// Check for streams that have been removed.
bool ret = true;
for (StreamParamsVec::const_iterator it = remote_streams_.begin();
it != remote_streams_.end(); ++it) {
if (!GetStreamBySsrc(streams, it->first_ssrc())) {
if (!RemoveRecvStream_w(it->first_ssrc())) {
std::ostringstream desc;
desc << "Failed to remove remote stream with ssrc "
<< it->first_ssrc() << ".";
SafeSetError(desc.str(), error_desc);
ret = false;
}
}
}
// Check for new streams.
for (StreamParamsVec::const_iterator it = streams.begin();
it != streams.end(); ++it) {
if (!GetStreamBySsrc(remote_streams_, it->first_ssrc())) {
if (AddRecvStream_w(*it)) {
LOG(LS_INFO) << "Add remote ssrc: " << it->ssrcs[0];
} else {
std::ostringstream desc;
desc << "Failed to add remote stream ssrc: " << it->first_ssrc();
SafeSetError(desc.str(), error_desc);
ret = false;
}
}
}
remote_streams_ = streams;
return ret;
}
void BaseChannel::MaybeCacheRtpAbsSendTimeHeaderExtension_w(
const std::vector<webrtc::RtpExtension>& extensions) {
// Absolute Send Time extension id is used only with external auth,
// so do not bother searching for it and making asyncronious call to set
// something that is not used.
#if defined(ENABLE_EXTERNAL_AUTH)
const webrtc::RtpExtension* send_time_extension =
FindHeaderExtension(extensions, webrtc::RtpExtension::kAbsSendTimeUri);
int rtp_abs_sendtime_extn_id =
send_time_extension ? send_time_extension->id : -1;
invoker_.AsyncInvoke<void>(
RTC_FROM_HERE, network_thread_,
Bind(&BaseChannel::CacheRtpAbsSendTimeHeaderExtension_n, this,
rtp_abs_sendtime_extn_id));
#endif
}
void BaseChannel::CacheRtpAbsSendTimeHeaderExtension_n(
int rtp_abs_sendtime_extn_id) {
rtp_abs_sendtime_extn_id_ = rtp_abs_sendtime_extn_id;
}
void BaseChannel::OnMessage(rtc::Message *pmsg) {
TRACE_EVENT0("webrtc", "BaseChannel::OnMessage");
switch (pmsg->message_id) {
case MSG_SEND_RTP_PACKET:
case MSG_SEND_RTCP_PACKET: {
RTC_DCHECK(network_thread_->IsCurrent());
SendPacketMessageData* data =
static_cast<SendPacketMessageData*>(pmsg->pdata);
bool rtcp = pmsg->message_id == MSG_SEND_RTCP_PACKET;
SendPacket(rtcp, &data->packet, data->options);
delete data;
break;
}
case MSG_FIRSTPACKETRECEIVED: {
SignalFirstPacketReceived(this);
break;
}
}
}
void BaseChannel::FlushRtcpMessages_n() {
// Flush all remaining RTCP messages. This should only be called in
// destructor.
RTC_DCHECK(network_thread_->IsCurrent());
rtc::MessageList rtcp_messages;
network_thread_->Clear(this, MSG_SEND_RTCP_PACKET, &rtcp_messages);
for (const auto& message : rtcp_messages) {
network_thread_->Send(RTC_FROM_HERE, this, MSG_SEND_RTCP_PACKET,
message.pdata);
}
}
void BaseChannel::SignalSentPacket_n(TransportChannel* /* channel */,
const rtc::SentPacket& sent_packet) {
RTC_DCHECK(network_thread_->IsCurrent());
invoker_.AsyncInvoke<void>(
RTC_FROM_HERE, worker_thread_,
rtc::Bind(&BaseChannel::SignalSentPacket_w, this, sent_packet));
}
void BaseChannel::SignalSentPacket_w(const rtc::SentPacket& sent_packet) {
RTC_DCHECK(worker_thread_->IsCurrent());
SignalSentPacket(sent_packet);
}
VoiceChannel::VoiceChannel(rtc::Thread* worker_thread,
rtc::Thread* network_thread,
MediaEngineInterface* media_engine,
VoiceMediaChannel* media_channel,
TransportController* transport_controller,
const std::string& content_name,
bool rtcp)
: BaseChannel(worker_thread,
network_thread,
media_channel,
transport_controller,
content_name,
rtcp),
media_engine_(media_engine),
received_media_(false) {}
VoiceChannel::~VoiceChannel() {
TRACE_EVENT0("webrtc", "VoiceChannel::~VoiceChannel");
StopAudioMonitor();
StopMediaMonitor();
// this can't be done in the base class, since it calls a virtual
DisableMedia_w();
Deinit();
}
bool VoiceChannel::Init_w(const std::string* bundle_transport_name) {
if (!BaseChannel::Init_w(bundle_transport_name)) {
return false;
}
return true;
}
bool VoiceChannel::SetAudioSend(uint32_t ssrc,
bool enable,
const AudioOptions* options,
AudioSource* source) {
return InvokeOnWorker(RTC_FROM_HERE,
Bind(&VoiceMediaChannel::SetAudioSend, media_channel(),
ssrc, enable, options, source));
}
// TODO(juberti): Handle early media the right way. We should get an explicit
// ringing message telling us to start playing local ringback, which we cancel
// if any early media actually arrives. For now, we do the opposite, which is
// to wait 1 second for early media, and start playing local ringback if none
// arrives.
void VoiceChannel::SetEarlyMedia(bool enable) {
if (enable) {
// Start the early media timeout
worker_thread()->PostDelayed(RTC_FROM_HERE, kEarlyMediaTimeout, this,
MSG_EARLYMEDIATIMEOUT);
} else {
// Stop the timeout if currently going.
worker_thread()->Clear(this, MSG_EARLYMEDIATIMEOUT);
}
}
bool VoiceChannel::CanInsertDtmf() {
return InvokeOnWorker(
RTC_FROM_HERE, Bind(&VoiceMediaChannel::CanInsertDtmf, media_channel()));
}
bool VoiceChannel::InsertDtmf(uint32_t ssrc,
int event_code,
int duration) {
return InvokeOnWorker(RTC_FROM_HERE, Bind(&VoiceChannel::InsertDtmf_w, this,
ssrc, event_code, duration));
}
bool VoiceChannel::SetOutputVolume(uint32_t ssrc, double volume) {
return InvokeOnWorker(RTC_FROM_HERE, Bind(&VoiceMediaChannel::SetOutputVolume,
media_channel(), ssrc, volume));
}
void VoiceChannel::SetRawAudioSink(
uint32_t ssrc,
std::unique_ptr<webrtc::AudioSinkInterface> sink) {
// We need to work around Bind's lack of support for unique_ptr and ownership
// passing. So we invoke to our own little routine that gets a pointer to
// our local variable. This is OK since we're synchronously invoking.
InvokeOnWorker(RTC_FROM_HERE,
Bind(&SetRawAudioSink_w, media_channel(), ssrc, &sink));
}
webrtc::RtpParameters VoiceChannel::GetRtpSendParameters(uint32_t ssrc) const {
return worker_thread()->Invoke<webrtc::RtpParameters>(
RTC_FROM_HERE, Bind(&VoiceChannel::GetRtpSendParameters_w, this, ssrc));
}
webrtc::RtpParameters VoiceChannel::GetRtpSendParameters_w(
uint32_t ssrc) const {
return media_channel()->GetRtpSendParameters(ssrc);
}
bool VoiceChannel::SetRtpSendParameters(
uint32_t ssrc,
const webrtc::RtpParameters& parameters) {
return InvokeOnWorker(
RTC_FROM_HERE,
Bind(&VoiceChannel::SetRtpSendParameters_w, this, ssrc, parameters));
}
bool VoiceChannel::SetRtpSendParameters_w(uint32_t ssrc,
webrtc::RtpParameters parameters) {
return media_channel()->SetRtpSendParameters(ssrc, parameters);
}
webrtc::RtpParameters VoiceChannel::GetRtpReceiveParameters(
uint32_t ssrc) const {
return worker_thread()->Invoke<webrtc::RtpParameters>(
RTC_FROM_HERE,
Bind(&VoiceChannel::GetRtpReceiveParameters_w, this, ssrc));
}
webrtc::RtpParameters VoiceChannel::GetRtpReceiveParameters_w(
uint32_t ssrc) const {
return media_channel()->GetRtpReceiveParameters(ssrc);
}
bool VoiceChannel::SetRtpReceiveParameters(
uint32_t ssrc,
const webrtc::RtpParameters& parameters) {
return InvokeOnWorker(
RTC_FROM_HERE,
Bind(&VoiceChannel::SetRtpReceiveParameters_w, this, ssrc, parameters));
}
bool VoiceChannel::SetRtpReceiveParameters_w(uint32_t ssrc,
webrtc::RtpParameters parameters) {
return media_channel()->SetRtpReceiveParameters(ssrc, parameters);
}
bool VoiceChannel::GetStats(VoiceMediaInfo* stats) {
return InvokeOnWorker(RTC_FROM_HERE, Bind(&VoiceMediaChannel::GetStats,
media_channel(), stats));
}
void VoiceChannel::StartMediaMonitor(int cms) {
media_monitor_.reset(new VoiceMediaMonitor(media_channel(), worker_thread(),
rtc::Thread::Current()));
media_monitor_->SignalUpdate.connect(
this, &VoiceChannel::OnMediaMonitorUpdate);
media_monitor_->Start(cms);
}
void VoiceChannel::StopMediaMonitor() {
if (media_monitor_) {
media_monitor_->Stop();
media_monitor_->SignalUpdate.disconnect(this);
media_monitor_.reset();
}
}
void VoiceChannel::StartAudioMonitor(int cms) {
audio_monitor_.reset(new AudioMonitor(this, rtc::Thread::Current()));
audio_monitor_
->SignalUpdate.connect(this, &VoiceChannel::OnAudioMonitorUpdate);
audio_monitor_->Start(cms);
}
void VoiceChannel::StopAudioMonitor() {
if (audio_monitor_) {
audio_monitor_->Stop();
audio_monitor_.reset();
}
}
bool VoiceChannel::IsAudioMonitorRunning() const {
return (audio_monitor_.get() != NULL);
}
int VoiceChannel::GetInputLevel_w() {
return media_engine_->GetInputLevel();
}
int VoiceChannel::GetOutputLevel_w() {
return media_channel()->GetOutputLevel();
}
void VoiceChannel::GetActiveStreams_w(AudioInfo::StreamList* actives) {
media_channel()->GetActiveStreams(actives);
}
void VoiceChannel::OnChannelRead(TransportChannel* channel,
const char* data, size_t len,
const rtc::PacketTime& packet_time,
int flags) {
BaseChannel::OnChannelRead(channel, data, len, packet_time, flags);
// Set a flag when we've received an RTP packet. If we're waiting for early
// media, this will disable the timeout.
if (!received_media_ && !PacketIsRtcp(channel, data, len)) {
received_media_ = true;
}
}
void BaseChannel::ChangeState() {
RTC_DCHECK(network_thread_->IsCurrent());
invoker_.AsyncInvoke<void>(RTC_FROM_HERE, worker_thread_,
Bind(&BaseChannel::ChangeState_w, this));
}
void VoiceChannel::ChangeState_w() {
// Render incoming data if we're the active call, and we have the local
// content. We receive data on the default channel and multiplexed streams.
bool recv = IsReadyToReceive_w();
media_channel()->SetPlayout(recv);
// Send outgoing data if we're the active call, we have the remote content,
// and we have had some form of connectivity.
bool send = IsReadyToSend_w();
media_channel()->SetSend(send);
LOG(LS_INFO) << "Changing voice state, recv=" << recv << " send=" << send;
}
const ContentInfo* VoiceChannel::GetFirstContent(
const SessionDescription* sdesc) {
return GetFirstAudioContent(sdesc);
}
bool VoiceChannel::SetLocalContent_w(const MediaContentDescription* content,
ContentAction action,
std::string* error_desc) {
TRACE_EVENT0("webrtc", "VoiceChannel::SetLocalContent_w");
ASSERT(worker_thread() == rtc::Thread::Current());
LOG(LS_INFO) << "Setting local voice description";
const AudioContentDescription* audio =
static_cast<const AudioContentDescription*>(content);
ASSERT(audio != NULL);
if (!audio) {
SafeSetError("Can't find audio content in local description.", error_desc);
return false;
}
if (!SetRtpTransportParameters(content, action, CS_LOCAL, error_desc)) {
return false;
}
AudioRecvParameters recv_params = last_recv_params_;
RtpParametersFromMediaDescription(audio, &recv_params);
if (!media_channel()->SetRecvParameters(recv_params)) {
SafeSetError("Failed to set local audio description recv parameters.",
error_desc);
return false;
}
for (const AudioCodec& codec : audio->codecs()) {
bundle_filter()->AddPayloadType(codec.id);
}
last_recv_params_ = recv_params;
// TODO(pthatcher): Move local streams into AudioSendParameters, and
// only give it to the media channel once we have a remote
// description too (without a remote description, we won't be able
// to send them anyway).
if (!UpdateLocalStreams_w(audio->streams(), action, error_desc)) {
SafeSetError("Failed to set local audio description streams.", error_desc);
return false;
}
set_local_content_direction(content->direction());
ChangeState_w();
return true;
}
bool VoiceChannel::SetRemoteContent_w(const MediaContentDescription* content,
ContentAction action,
std::string* error_desc) {
TRACE_EVENT0("webrtc", "VoiceChannel::SetRemoteContent_w");
ASSERT(worker_thread() == rtc::Thread::Current());
LOG(LS_INFO) << "Setting remote voice description";
const AudioContentDescription* audio =
static_cast<const AudioContentDescription*>(content);
ASSERT(audio != NULL);
if (!audio) {
SafeSetError("Can't find audio content in remote description.", error_desc);
return false;
}
if (!SetRtpTransportParameters(content, action, CS_REMOTE, error_desc)) {
return false;
}
AudioSendParameters send_params = last_send_params_;
RtpSendParametersFromMediaDescription(audio, &send_params);
if (audio->agc_minus_10db()) {
send_params.options.adjust_agc_delta = rtc::Optional<int>(kAgcMinus10db);
}
bool parameters_applied = media_channel()->SetSendParameters(send_params);
if (!parameters_applied) {
SafeSetError("Failed to set remote audio description send parameters.",
error_desc);
return false;
}
last_send_params_ = send_params;
// TODO(pthatcher): Move remote streams into AudioRecvParameters,
// and only give it to the media channel once we have a local
// description too (without a local description, we won't be able to
// recv them anyway).
if (!UpdateRemoteStreams_w(audio->streams(), action, error_desc)) {
SafeSetError("Failed to set remote audio description streams.", error_desc);
return false;
}
if (audio->rtp_header_extensions_set()) {
MaybeCacheRtpAbsSendTimeHeaderExtension_w(audio->rtp_header_extensions());
}
set_remote_content_direction(content->direction());
ChangeState_w();
return true;
}
void VoiceChannel::HandleEarlyMediaTimeout() {
// This occurs on the main thread, not the worker thread.
if (!received_media_) {
LOG(LS_INFO) << "No early media received before timeout";
SignalEarlyMediaTimeout(this);
}
}
bool VoiceChannel::InsertDtmf_w(uint32_t ssrc,
int event,
int duration) {
if (!enabled()) {
return false;
}
return media_channel()->InsertDtmf(ssrc, event, duration);
}
void VoiceChannel::OnMessage(rtc::Message *pmsg) {
switch (pmsg->message_id) {
case MSG_EARLYMEDIATIMEOUT:
HandleEarlyMediaTimeout();
break;
case MSG_CHANNEL_ERROR: {
VoiceChannelErrorMessageData* data =
static_cast<VoiceChannelErrorMessageData*>(pmsg->pdata);
delete data;
break;
}
default:
BaseChannel::OnMessage(pmsg);
break;
}
}
void VoiceChannel::OnConnectionMonitorUpdate(
ConnectionMonitor* monitor, const std::vector<ConnectionInfo>& infos) {
SignalConnectionMonitor(this, infos);
}
void VoiceChannel::OnMediaMonitorUpdate(
VoiceMediaChannel* media_channel, const VoiceMediaInfo& info) {
ASSERT(media_channel == this->media_channel());
SignalMediaMonitor(this, info);
}
void VoiceChannel::OnAudioMonitorUpdate(AudioMonitor* monitor,
const AudioInfo& info) {
SignalAudioMonitor(this, info);
}
void VoiceChannel::GetSrtpCryptoSuites_n(
std::vector<int>* crypto_suites) const {
GetSupportedAudioCryptoSuites(crypto_suites);
}
VideoChannel::VideoChannel(rtc::Thread* worker_thread,
rtc::Thread* network_thread,
VideoMediaChannel* media_channel,
TransportController* transport_controller,
const std::string& content_name,
bool rtcp)
: BaseChannel(worker_thread,
network_thread,
media_channel,
transport_controller,
content_name,
rtcp) {}
bool VideoChannel::Init_w(const std::string* bundle_transport_name) {
if (!BaseChannel::Init_w(bundle_transport_name)) {
return false;
}
return true;
}
VideoChannel::~VideoChannel() {
TRACE_EVENT0("webrtc", "VideoChannel::~VideoChannel");
StopMediaMonitor();
// this can't be done in the base class, since it calls a virtual
DisableMedia_w();
Deinit();
}
bool VideoChannel::SetSink(uint32_t ssrc,
rtc::VideoSinkInterface<VideoFrame>* sink) {
worker_thread()->Invoke<void>(
RTC_FROM_HERE,
Bind(&VideoMediaChannel::SetSink, media_channel(), ssrc, sink));
return true;
}
bool VideoChannel::SetVideoSend(
uint32_t ssrc,
bool mute,
const VideoOptions* options,
rtc::VideoSourceInterface<cricket::VideoFrame>* source) {
return InvokeOnWorker(RTC_FROM_HERE,
Bind(&VideoMediaChannel::SetVideoSend, media_channel(),
ssrc, mute, options, source));
}
webrtc::RtpParameters VideoChannel::GetRtpSendParameters(uint32_t ssrc) const {
return worker_thread()->Invoke<webrtc::RtpParameters>(
RTC_FROM_HERE, Bind(&VideoChannel::GetRtpSendParameters_w, this, ssrc));
}
webrtc::RtpParameters VideoChannel::GetRtpSendParameters_w(
uint32_t ssrc) const {
return media_channel()->GetRtpSendParameters(ssrc);
}
bool VideoChannel::SetRtpSendParameters(
uint32_t ssrc,
const webrtc::RtpParameters& parameters) {
return InvokeOnWorker(
RTC_FROM_HERE,
Bind(&VideoChannel::SetRtpSendParameters_w, this, ssrc, parameters));
}
bool VideoChannel::SetRtpSendParameters_w(uint32_t ssrc,
webrtc::RtpParameters parameters) {
return media_channel()->SetRtpSendParameters(ssrc, parameters);
}
webrtc::RtpParameters VideoChannel::GetRtpReceiveParameters(
uint32_t ssrc) const {
return worker_thread()->Invoke<webrtc::RtpParameters>(
RTC_FROM_HERE,
Bind(&VideoChannel::GetRtpReceiveParameters_w, this, ssrc));
}
webrtc::RtpParameters VideoChannel::GetRtpReceiveParameters_w(
uint32_t ssrc) const {
return media_channel()->GetRtpReceiveParameters(ssrc);
}
bool VideoChannel::SetRtpReceiveParameters(
uint32_t ssrc,
const webrtc::RtpParameters& parameters) {
return InvokeOnWorker(
RTC_FROM_HERE,
Bind(&VideoChannel::SetRtpReceiveParameters_w, this, ssrc, parameters));
}
bool VideoChannel::SetRtpReceiveParameters_w(uint32_t ssrc,
webrtc::RtpParameters parameters) {
return media_channel()->SetRtpReceiveParameters(ssrc, parameters);
}
void VideoChannel::ChangeState_w() {
// Send outgoing data if we're the active call, we have the remote content,
// and we have had some form of connectivity.
bool send = IsReadyToSend_w();
if (!media_channel()->SetSend(send)) {
LOG(LS_ERROR) << "Failed to SetSend on video channel";
// TODO(gangji): Report error back to server.
}
LOG(LS_INFO) << "Changing video state, send=" << send;
}
bool VideoChannel::GetStats(VideoMediaInfo* stats) {
return InvokeOnWorker(RTC_FROM_HERE, Bind(&VideoMediaChannel::GetStats,
media_channel(), stats));
}
void VideoChannel::StartMediaMonitor(int cms) {
media_monitor_.reset(new VideoMediaMonitor(media_channel(), worker_thread(),
rtc::Thread::Current()));
media_monitor_->SignalUpdate.connect(
this, &VideoChannel::OnMediaMonitorUpdate);
media_monitor_->Start(cms);
}
void VideoChannel::StopMediaMonitor() {
if (media_monitor_) {
media_monitor_->Stop();
media_monitor_.reset();
}
}
const ContentInfo* VideoChannel::GetFirstContent(
const SessionDescription* sdesc) {
return GetFirstVideoContent(sdesc);
}
bool VideoChannel::SetLocalContent_w(const MediaContentDescription* content,
ContentAction action,
std::string* error_desc) {
TRACE_EVENT0("webrtc", "VideoChannel::SetLocalContent_w");
ASSERT(worker_thread() == rtc::Thread::Current());
LOG(LS_INFO) << "Setting local video description";
const VideoContentDescription* video =
static_cast<const VideoContentDescription*>(content);
ASSERT(video != NULL);
if (!video) {
SafeSetError("Can't find video content in local description.", error_desc);
return false;
}
if (!SetRtpTransportParameters(content, action, CS_LOCAL, error_desc)) {
return false;
}
VideoRecvParameters recv_params = last_recv_params_;
RtpParametersFromMediaDescription(video, &recv_params);
if (!media_channel()->SetRecvParameters(recv_params)) {
SafeSetError("Failed to set local video description recv parameters.",
error_desc);
return false;
}
for (const VideoCodec& codec : video->codecs()) {
bundle_filter()->AddPayloadType(codec.id);
}
last_recv_params_ = recv_params;
// TODO(pthatcher): Move local streams into VideoSendParameters, and
// only give it to the media channel once we have a remote
// description too (without a remote description, we won't be able
// to send them anyway).
if (!UpdateLocalStreams_w(video->streams(), action, error_desc)) {
SafeSetError("Failed to set local video description streams.", error_desc);
return false;
}
set_local_content_direction(content->direction());
ChangeState_w();
return true;
}
bool VideoChannel::SetRemoteContent_w(const MediaContentDescription* content,
ContentAction action,
std::string* error_desc) {
TRACE_EVENT0("webrtc", "VideoChannel::SetRemoteContent_w");
ASSERT(worker_thread() == rtc::Thread::Current());
LOG(LS_INFO) << "Setting remote video description";
const VideoContentDescription* video =
static_cast<const VideoContentDescription*>(content);
ASSERT(video != NULL);
if (!video) {
SafeSetError("Can't find video content in remote description.", error_desc);
return false;
}
if (!SetRtpTransportParameters(content, action, CS_REMOTE, error_desc)) {
return false;
}
VideoSendParameters send_params = last_send_params_;
RtpSendParametersFromMediaDescription(video, &send_params);
if (video->conference_mode()) {
send_params.conference_mode = true;
}
bool parameters_applied = media_channel()->SetSendParameters(send_params);
if (!parameters_applied) {
SafeSetError("Failed to set remote video description send parameters.",
error_desc);
return false;
}
last_send_params_ = send_params;
// TODO(pthatcher): Move remote streams into VideoRecvParameters,
// and only give it to the media channel once we have a local
// description too (without a local description, we won't be able to
// recv them anyway).
if (!UpdateRemoteStreams_w(video->streams(), action, error_desc)) {
SafeSetError("Failed to set remote video description streams.", error_desc);
return false;
}
if (video->rtp_header_extensions_set()) {
MaybeCacheRtpAbsSendTimeHeaderExtension_w(video->rtp_header_extensions());
}
set_remote_content_direction(content->direction());
ChangeState_w();
return true;
}
void VideoChannel::OnMessage(rtc::Message *pmsg) {
switch (pmsg->message_id) {
case MSG_CHANNEL_ERROR: {
const VideoChannelErrorMessageData* data =
static_cast<VideoChannelErrorMessageData*>(pmsg->pdata);
delete data;
break;
}
default:
BaseChannel::OnMessage(pmsg);
break;
}
}
void VideoChannel::OnConnectionMonitorUpdate(
ConnectionMonitor* monitor, const std::vector<ConnectionInfo> &infos) {
SignalConnectionMonitor(this, infos);
}
// TODO(pthatcher): Look into removing duplicate code between
// audio, video, and data, perhaps by using templates.
void VideoChannel::OnMediaMonitorUpdate(
VideoMediaChannel* media_channel, const VideoMediaInfo &info) {
ASSERT(media_channel == this->media_channel());
SignalMediaMonitor(this, info);
}
void VideoChannel::GetSrtpCryptoSuites_n(
std::vector<int>* crypto_suites) const {
GetSupportedVideoCryptoSuites(crypto_suites);
}
DataChannel::DataChannel(rtc::Thread* worker_thread,
rtc::Thread* network_thread,
DataMediaChannel* media_channel,
TransportController* transport_controller,
const std::string& content_name,
bool rtcp)
: BaseChannel(worker_thread,
network_thread,
media_channel,
transport_controller,
content_name,
rtcp),
data_channel_type_(cricket::DCT_NONE),
ready_to_send_data_(false) {}
DataChannel::~DataChannel() {
TRACE_EVENT0("webrtc", "DataChannel::~DataChannel");
StopMediaMonitor();
// this can't be done in the base class, since it calls a virtual
DisableMedia_w();
Deinit();
}
bool DataChannel::Init_w(const std::string* bundle_transport_name) {
if (!BaseChannel::Init_w(bundle_transport_name)) {
return false;
}
media_channel()->SignalDataReceived.connect(
this, &DataChannel::OnDataReceived);
media_channel()->SignalReadyToSend.connect(
this, &DataChannel::OnDataChannelReadyToSend);
media_channel()->SignalStreamClosedRemotely.connect(
this, &DataChannel::OnStreamClosedRemotely);
return true;
}
bool DataChannel::SendData(const SendDataParams& params,
const rtc::CopyOnWriteBuffer& payload,
SendDataResult* result) {
return InvokeOnWorker(
RTC_FROM_HERE, Bind(&DataMediaChannel::SendData, media_channel(), params,
payload, result));
}
const ContentInfo* DataChannel::GetFirstContent(
const SessionDescription* sdesc) {
return GetFirstDataContent(sdesc);
}
bool DataChannel::WantsPacket(bool rtcp, const rtc::CopyOnWriteBuffer* packet) {
if (data_channel_type_ == DCT_SCTP) {
// TODO(pthatcher): Do this in a more robust way by checking for
// SCTP or DTLS.
return !IsRtpPacket(packet->data(), packet->size());
} else if (data_channel_type_ == DCT_RTP) {
return BaseChannel::WantsPacket(rtcp, packet);
}
return false;
}
bool DataChannel::SetDataChannelType(DataChannelType new_data_channel_type,
std::string* error_desc) {
// It hasn't been set before, so set it now.
if (data_channel_type_ == DCT_NONE) {
data_channel_type_ = new_data_channel_type;
return true;
}
// It's been set before, but doesn't match. That's bad.
if (data_channel_type_ != new_data_channel_type) {
std::ostringstream desc;
desc << "Data channel type mismatch."
<< " Expected " << data_channel_type_
<< " Got " << new_data_channel_type;
SafeSetError(desc.str(), error_desc);
return false;
}
// It's hasn't changed. Nothing to do.
return true;
}
bool DataChannel::SetDataChannelTypeFromContent(
const DataContentDescription* content,
std::string* error_desc) {
bool is_sctp = ((content->protocol() == kMediaProtocolSctp) ||
(content->protocol() == kMediaProtocolDtlsSctp));
DataChannelType data_channel_type = is_sctp ? DCT_SCTP : DCT_RTP;
return SetDataChannelType(data_channel_type, error_desc);
}
bool DataChannel::SetLocalContent_w(const MediaContentDescription* content,
ContentAction action,
std::string* error_desc) {
TRACE_EVENT0("webrtc", "DataChannel::SetLocalContent_w");
ASSERT(worker_thread() == rtc::Thread::Current());
LOG(LS_INFO) << "Setting local data description";
const DataContentDescription* data =
static_cast<const DataContentDescription*>(content);
ASSERT(data != NULL);
if (!data) {
SafeSetError("Can't find data content in local description.", error_desc);
return false;
}
if (!SetDataChannelTypeFromContent(data, error_desc)) {
return false;
}
if (data_channel_type_ == DCT_RTP) {
if (!SetRtpTransportParameters(content, action, CS_LOCAL, error_desc)) {
return false;
}
}
// FYI: We send the SCTP port number (not to be confused with the
// underlying UDP port number) as a codec parameter. So even SCTP
// data channels need codecs.
DataRecvParameters recv_params = last_recv_params_;
RtpParametersFromMediaDescription(data, &recv_params);
if (!media_channel()->SetRecvParameters(recv_params)) {
SafeSetError("Failed to set remote data description recv parameters.",
error_desc);
return false;
}
if (data_channel_type_ == DCT_RTP) {
for (const DataCodec& codec : data->codecs()) {
bundle_filter()->AddPayloadType(codec.id);
}
}
last_recv_params_ = recv_params;
// TODO(pthatcher): Move local streams into DataSendParameters, and
// only give it to the media channel once we have a remote
// description too (without a remote description, we won't be able
// to send them anyway).
if (!UpdateLocalStreams_w(data->streams(), action, error_desc)) {
SafeSetError("Failed to set local data description streams.", error_desc);
return false;
}
set_local_content_direction(content->direction());
ChangeState_w();
return true;
}
bool DataChannel::SetRemoteContent_w(const MediaContentDescription* content,
ContentAction action,
std::string* error_desc) {
TRACE_EVENT0("webrtc", "DataChannel::SetRemoteContent_w");
ASSERT(worker_thread() == rtc::Thread::Current());
const DataContentDescription* data =
static_cast<const DataContentDescription*>(content);
ASSERT(data != NULL);
if (!data) {
SafeSetError("Can't find data content in remote description.", error_desc);
return false;
}
// If the remote data doesn't have codecs and isn't an update, it
// must be empty, so ignore it.
if (!data->has_codecs() && action != CA_UPDATE) {
return true;
}
if (!SetDataChannelTypeFromContent(data, error_desc)) {
return false;
}
LOG(LS_INFO) << "Setting remote data description";
if (data_channel_type_ == DCT_RTP &&
!SetRtpTransportParameters(content, action, CS_REMOTE, error_desc)) {
return false;
}
DataSendParameters send_params = last_send_params_;
RtpSendParametersFromMediaDescription<DataCodec>(data, &send_params);
if (!media_channel()->SetSendParameters(send_params)) {
SafeSetError("Failed to set remote data description send parameters.",
error_desc);
return false;
}
last_send_params_ = send_params;
// TODO(pthatcher): Move remote streams into DataRecvParameters,
// and only give it to the media channel once we have a local
// description too (without a local description, we won't be able to
// recv them anyway).
if (!UpdateRemoteStreams_w(data->streams(), action, error_desc)) {
SafeSetError("Failed to set remote data description streams.",
error_desc);
return false;
}
set_remote_content_direction(content->direction());
ChangeState_w();
return true;
}
void DataChannel::ChangeState_w() {
// Render incoming data if we're the active call, and we have the local
// content. We receive data on the default channel and multiplexed streams.
bool recv = IsReadyToReceive_w();
if (!media_channel()->SetReceive(recv)) {
LOG(LS_ERROR) << "Failed to SetReceive on data channel";
}
// Send outgoing data if we're the active call, we have the remote content,
// and we have had some form of connectivity.
bool send = IsReadyToSend_w();
if (!media_channel()->SetSend(send)) {
LOG(LS_ERROR) << "Failed to SetSend on data channel";
}
// Trigger SignalReadyToSendData asynchronously.
OnDataChannelReadyToSend(send);
LOG(LS_INFO) << "Changing data state, recv=" << recv << " send=" << send;
}
void DataChannel::OnMessage(rtc::Message *pmsg) {
switch (pmsg->message_id) {
case MSG_READYTOSENDDATA: {
DataChannelReadyToSendMessageData* data =
static_cast<DataChannelReadyToSendMessageData*>(pmsg->pdata);
ready_to_send_data_ = data->data();
SignalReadyToSendData(ready_to_send_data_);
delete data;
break;
}
case MSG_DATARECEIVED: {
DataReceivedMessageData* data =
static_cast<DataReceivedMessageData*>(pmsg->pdata);
SignalDataReceived(this, data->params, data->payload);
delete data;
break;
}
case MSG_CHANNEL_ERROR: {
const DataChannelErrorMessageData* data =
static_cast<DataChannelErrorMessageData*>(pmsg->pdata);
delete data;
break;
}
case MSG_STREAMCLOSEDREMOTELY: {
rtc::TypedMessageData<uint32_t>* data =
static_cast<rtc::TypedMessageData<uint32_t>*>(pmsg->pdata);
SignalStreamClosedRemotely(data->data());
delete data;
break;
}
default:
BaseChannel::OnMessage(pmsg);
break;
}
}
void DataChannel::OnConnectionMonitorUpdate(
ConnectionMonitor* monitor, const std::vector<ConnectionInfo>& infos) {
SignalConnectionMonitor(this, infos);
}
void DataChannel::StartMediaMonitor(int cms) {
media_monitor_.reset(new DataMediaMonitor(media_channel(), worker_thread(),
rtc::Thread::Current()));
media_monitor_->SignalUpdate.connect(
this, &DataChannel::OnMediaMonitorUpdate);
media_monitor_->Start(cms);
}
void DataChannel::StopMediaMonitor() {
if (media_monitor_) {
media_monitor_->Stop();
media_monitor_->SignalUpdate.disconnect(this);
media_monitor_.reset();
}
}
void DataChannel::OnMediaMonitorUpdate(
DataMediaChannel* media_channel, const DataMediaInfo& info) {
ASSERT(media_channel == this->media_channel());
SignalMediaMonitor(this, info);
}
void DataChannel::OnDataReceived(
const ReceiveDataParams& params, const char* data, size_t len) {
DataReceivedMessageData* msg = new DataReceivedMessageData(
params, data, len);
signaling_thread()->Post(RTC_FROM_HERE, this, MSG_DATARECEIVED, msg);
}
void DataChannel::OnDataChannelError(uint32_t ssrc,
DataMediaChannel::Error err) {
DataChannelErrorMessageData* data = new DataChannelErrorMessageData(
ssrc, err);
signaling_thread()->Post(RTC_FROM_HERE, this, MSG_CHANNEL_ERROR, data);
}
void DataChannel::OnDataChannelReadyToSend(bool writable) {
// This is usded for congestion control to indicate that the stream is ready
// to send by the MediaChannel, as opposed to OnReadyToSend, which indicates
// that the transport channel is ready.
signaling_thread()->Post(RTC_FROM_HERE, this, MSG_READYTOSENDDATA,
new DataChannelReadyToSendMessageData(writable));
}
void DataChannel::GetSrtpCryptoSuites_n(std::vector<int>* crypto_suites) const {
GetSupportedDataCryptoSuites(crypto_suites);
}
bool DataChannel::ShouldSetupDtlsSrtp_n() const {
return data_channel_type_ == DCT_RTP && BaseChannel::ShouldSetupDtlsSrtp_n();
}
void DataChannel::OnStreamClosedRemotely(uint32_t sid) {
rtc::TypedMessageData<uint32_t>* message =
new rtc::TypedMessageData<uint32_t>(sid);
signaling_thread()->Post(RTC_FROM_HERE, this, MSG_STREAMCLOSEDREMOTELY,
message);
}
} // namespace cricket