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* Copyright 2018 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 <map>
#include <memory>
#include <set>
#include <string>
#include <vector>
#include "absl/types/optional.h"
#include "api/peer_connection_interface.h"
#include "call/call.h"
#include "modules/audio_device/include/audio_device.h"
#include "pc/jsep_transport_controller.h"
#include "pc/peer_connection_message_handler.h"
#include "pc/rtp_transceiver.h"
#include "pc/rtp_transmission_manager.h"
#include "pc/sctp_data_channel.h"
namespace webrtc {
class DataChannelController;
class LegacyStatsCollector;
// This interface defines the functions that are needed for
// SdpOfferAnswerHandler to access PeerConnection internal state.
class PeerConnectionSdpMethods {
virtual ~PeerConnectionSdpMethods() = default;
// The SDP session ID as defined by RFC 3264.
virtual std::string session_id() const = 0;
// Returns true if the ICE restart flag above was set, and no ICE restart has
// occurred yet for this transport (by applying a local description with
// changed ufrag/password). If the transport has been deleted as a result of
// bundling, returns false.
virtual bool NeedsIceRestart(const std::string& content_name) const = 0;
virtual absl::optional<std::string> sctp_mid() const = 0;
// Functions below this comment are known to only be accessed
// from SdpOfferAnswerHandler.
// Return a pointer to the active configuration.
virtual const PeerConnectionInterface::RTCConfiguration* configuration()
const = 0;
// Report the UMA metric BundleUsage for the given remote description.
virtual void ReportSdpBundleUsage(
const SessionDescriptionInterface& remote_description) = 0;
virtual PeerConnectionMessageHandler* message_handler() = 0;
virtual RtpTransmissionManager* rtp_manager() = 0;
virtual const RtpTransmissionManager* rtp_manager() const = 0;
virtual bool dtls_enabled() const = 0;
virtual const PeerConnectionFactoryInterface::Options* options() const = 0;
// Returns the CryptoOptions for this PeerConnection. This will always
// return the RTCConfiguration.crypto_options if set and will only default
// back to the PeerConnectionFactory settings if nothing was set.
virtual CryptoOptions GetCryptoOptions() = 0;
virtual JsepTransportController* transport_controller_s() = 0;
virtual JsepTransportController* transport_controller_n() = 0;
virtual DataChannelController* data_channel_controller() = 0;
virtual cricket::PortAllocator* port_allocator() = 0;
virtual LegacyStatsCollector* legacy_stats() = 0;
// Returns the observer. Will crash on CHECK if the observer is removed.
virtual PeerConnectionObserver* Observer() const = 0;
virtual absl::optional<rtc::SSLRole> GetSctpSslRole_n() = 0;
virtual PeerConnectionInterface::IceConnectionState
ice_connection_state_internal() = 0;
virtual void SetIceConnectionState(
PeerConnectionInterface::IceConnectionState new_state) = 0;
virtual void NoteUsageEvent(UsageEvent event) = 0;
virtual bool IsClosed() const = 0;
// Returns true if the PeerConnection is configured to use Unified Plan
// semantics for creating offers/answers and setting local/remote
// descriptions. If this is true the RtpTransceiver API will also be available
// to the user. If this is false, Plan B semantics are assumed.
// TODO( Flip the default to be Unified Plan once
// sufficient time has passed.
virtual bool IsUnifiedPlan() const = 0;
virtual bool ValidateBundleSettings(
const cricket::SessionDescription* desc,
const std::map<std::string, const cricket::ContentGroup*>&
bundle_groups_by_mid) = 0;
// Internal implementation for AddTransceiver family of methods. If
// `fire_callback` is set, fires OnRenegotiationNeeded callback if successful.
virtual RTCErrorOr<rtc::scoped_refptr<RtpTransceiverInterface>>
AddTransceiver(cricket::MediaType media_type,
rtc::scoped_refptr<MediaStreamTrackInterface> track,
const RtpTransceiverInit& init,
bool fire_callback = true) = 0;
// Asynchronously calls SctpTransport::Start() on the network thread for
// `sctp_mid()` if set. Called as part of setting the local description.
virtual void StartSctpTransport(int local_port,
int remote_port,
int max_message_size) = 0;
// Asynchronously adds a remote candidate on the network thread.
virtual void AddRemoteCandidate(const std::string& mid,
const cricket::Candidate& candidate) = 0;
virtual Call* call_ptr() = 0;
// Returns true if SRTP (either using DTLS-SRTP or SDES) is required by
// this session.
virtual bool SrtpRequired() const = 0;
// Initializes the data channel transport for the peerconnection instance.
// This will have the effect that `sctp_mid()` and `sctp_transport_name()`
// will return a set value (even though it might be an empty string) and the
// dc transport will be initialized on the network thread.
virtual bool CreateDataChannelTransport(absl::string_view mid) = 0;
// Tears down the data channel transport state and clears the `sctp_mid()` and
// `sctp_transport_name()` properties.
virtual void DestroyDataChannelTransport(RTCError error) = 0;
virtual const FieldTrialsView& trials() const = 0;
virtual void ClearStatsCache() = 0;
// Functions defined in this class are called by other objects,
// but not by SdpOfferAnswerHandler.
class PeerConnectionInternal : public PeerConnectionInterface,
public PeerConnectionSdpMethods {
virtual rtc::Thread* network_thread() const = 0;
virtual rtc::Thread* worker_thread() const = 0;
// Returns true if we were the initial offerer.
virtual bool initial_offerer() const = 0;
virtual std::vector<
GetTransceiversInternal() const = 0;
// Call on the network thread to fetch stats for all the data channels.
// TODO(tommi): Make pure virtual after downstream updates.
virtual std::vector<DataChannelStats> GetDataChannelStats() const {
return {};
virtual absl::optional<std::string> sctp_transport_name() const = 0;
virtual cricket::CandidateStatsList GetPooledCandidateStats() const = 0;
// Returns a map from transport name to transport stats for all given
// transport names.
// Must be called on the network thread.
virtual std::map<std::string, cricket::TransportStats>
GetTransportStatsByNames(const std::set<std::string>& transport_names) = 0;
virtual Call::Stats GetCallStats() = 0;
virtual absl::optional<AudioDeviceModule::Stats> GetAudioDeviceStats() = 0;
virtual bool GetLocalCertificate(
const std::string& transport_name,
rtc::scoped_refptr<rtc::RTCCertificate>* certificate) = 0;
virtual std::unique_ptr<rtc::SSLCertChain> GetRemoteSSLCertChain(
const std::string& transport_name) = 0;
// Returns true if there was an ICE restart initiated by the remote offer.
virtual bool IceRestartPending(const std::string& content_name) const = 0;
// Get SSL role for an arbitrary m= section (handles bundling correctly).
virtual bool GetSslRole(const std::string& content_name,
rtc::SSLRole* role) = 0;
// Functions needed by DataChannelController
virtual void NoteDataAddedEvent() {}
// Handler for sctp data channel state changes.
// The `channel_id` is the same unique identifier as used in
// `DataChannelStats::internal_id and
// `RTCDataChannelStats::data_channel_identifier`.
virtual void OnSctpDataChannelStateChanged(
int channel_id,
DataChannelInterface::DataState state) {}
} // namespace webrtc