Bjorn A Mellem | 44bd71c | 2019-05-28 15:25:38 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2019 The WebRTC project authors. All Rights Reserved. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license |
| 5 | * that can be found in the LICENSE file in the root of the source |
| 6 | * tree. An additional intellectual property rights grant can be found |
| 7 | * in the file PATENTS. All contributing project authors may |
| 8 | * be found in the AUTHORS file in the root of the source tree. |
| 9 | */ |
| 10 | |
| 11 | #ifndef PC_COMPOSITE_RTP_TRANSPORT_H_ |
| 12 | #define PC_COMPOSITE_RTP_TRANSPORT_H_ |
| 13 | |
| 14 | #include <memory> |
Bjorn A Mellem | c85ebbe | 2019-06-07 10:28:06 -0700 | [diff] [blame^] | 15 | #include <set> |
Bjorn A Mellem | 44bd71c | 2019-05-28 15:25:38 -0700 | [diff] [blame] | 16 | #include <string> |
| 17 | #include <vector> |
| 18 | |
| 19 | #include "call/rtp_demuxer.h" |
| 20 | #include "call/rtp_packet_sink_interface.h" |
| 21 | #include "pc/rtp_transport_internal.h" |
| 22 | #include "pc/session_description.h" |
| 23 | #include "rtc_base/async_packet_socket.h" |
| 24 | #include "rtc_base/copy_on_write_buffer.h" |
| 25 | |
| 26 | namespace webrtc { |
| 27 | |
| 28 | // Composite RTP transport capable of receiving from multiple sub-transports. |
| 29 | // |
| 30 | // CompositeRtpTransport is receive-only until the caller explicitly chooses |
| 31 | // which transport will be used to send and calls |SetSendTransport|. This |
| 32 | // choice must be made as part of the SDP negotiation process, based on receipt |
| 33 | // of a provisional answer. |CompositeRtpTransport| does not become writable or |
| 34 | // ready to send until |SetSendTransport| is called. |
| 35 | // |
| 36 | // When a full answer is received, the user should replace the composite |
| 37 | // transport with the single, chosen RTP transport, then delete the composite |
| 38 | // and all non-chosen transports. |
| 39 | class CompositeRtpTransport : public RtpTransportInternal { |
| 40 | public: |
| 41 | // Constructs a composite out of the given |transports|. |transports| must |
| 42 | // not be empty. All |transports| must outlive the composite. |
| 43 | explicit CompositeRtpTransport(std::vector<RtpTransportInternal*> transports); |
| 44 | |
| 45 | // Sets which transport will be used for sending packets. Once called, |
| 46 | // |IsReadyToSend|, |IsWritable|, and the associated signals will reflect the |
| 47 | // state of |send_tranpsort|. |
| 48 | void SetSendTransport(RtpTransportInternal* send_transport); |
| 49 | |
Bjorn A Mellem | c85ebbe | 2019-06-07 10:28:06 -0700 | [diff] [blame^] | 50 | // Removes |transport| from the composite. No-op if |transport| is null or |
| 51 | // not found in the composite. Removing a transport disconnects all signals |
| 52 | // and RTP demux sinks from that transport. The send transport may not be |
| 53 | // removed. |
| 54 | void RemoveTransport(RtpTransportInternal* transport); |
| 55 | |
Bjorn A Mellem | 44bd71c | 2019-05-28 15:25:38 -0700 | [diff] [blame] | 56 | // All transports within a composite must have the same name. |
| 57 | const std::string& transport_name() const override; |
| 58 | |
| 59 | int SetRtpOption(rtc::Socket::Option opt, int value) override; |
| 60 | int SetRtcpOption(rtc::Socket::Option opt, int value) override; |
| 61 | |
| 62 | // All transports within a composite must either enable or disable RTCP mux. |
| 63 | bool rtcp_mux_enabled() const override; |
| 64 | |
| 65 | // Enables or disables RTCP mux for all component transports. |
| 66 | void SetRtcpMuxEnabled(bool enabled) override; |
| 67 | |
| 68 | // The composite is ready to send if |send_transport_| is set and ready to |
| 69 | // send. |
| 70 | bool IsReadyToSend() const override; |
| 71 | |
| 72 | // The composite is writable if |send_transport_| is set and writable. |
| 73 | bool IsWritable(bool rtcp) const override; |
| 74 | |
| 75 | // Sends an RTP packet. May only be called after |send_transport_| is set. |
| 76 | bool SendRtpPacket(rtc::CopyOnWriteBuffer* packet, |
| 77 | const rtc::PacketOptions& options, |
| 78 | int flags) override; |
| 79 | |
| 80 | // Sends an RTCP packet. May only be called after |send_transport_| is set. |
| 81 | bool SendRtcpPacket(rtc::CopyOnWriteBuffer* packet, |
| 82 | const rtc::PacketOptions& options, |
| 83 | int flags) override; |
| 84 | |
| 85 | // Updates the mapping of RTP header extensions for all component transports. |
| 86 | void UpdateRtpHeaderExtensionMap( |
| 87 | const cricket::RtpHeaderExtensions& header_extensions) override; |
| 88 | |
| 89 | // SRTP is only active for a composite if it is active for all component |
| 90 | // transports. |
| 91 | bool IsSrtpActive() const override; |
| 92 | |
| 93 | // Registers an RTP demux sink with all component transports. |
| 94 | bool RegisterRtpDemuxerSink(const RtpDemuxerCriteria& criteria, |
| 95 | RtpPacketSinkInterface* sink) override; |
| 96 | bool UnregisterRtpDemuxerSink(RtpPacketSinkInterface* sink) override; |
| 97 | |
| 98 | private: |
| 99 | // Receive-side signals. |
| 100 | void OnNetworkRouteChanged(absl::optional<rtc::NetworkRoute> route); |
| 101 | void OnRtcpPacketReceived(rtc::CopyOnWriteBuffer* packet, |
| 102 | int64_t packet_time_us); |
| 103 | |
| 104 | // Send-side signals. |
| 105 | void OnWritableState(bool writable); |
| 106 | void OnReadyToSend(bool ready_to_send); |
| 107 | void OnSentPacket(const rtc::SentPacket& packet); |
| 108 | |
| 109 | std::vector<RtpTransportInternal*> transports_; |
| 110 | RtpTransportInternal* send_transport_ = nullptr; |
Bjorn A Mellem | c85ebbe | 2019-06-07 10:28:06 -0700 | [diff] [blame^] | 111 | |
| 112 | // Record of registered RTP demuxer sinks. Used to unregister sinks when a |
| 113 | // transport is removed. |
| 114 | std::set<RtpPacketSinkInterface*> rtp_demuxer_sinks_; |
Bjorn A Mellem | 44bd71c | 2019-05-28 15:25:38 -0700 | [diff] [blame] | 115 | }; |
| 116 | |
| 117 | } // namespace webrtc |
| 118 | |
| 119 | #endif // PC_COMPOSITE_RTP_TRANSPORT_H_ |