1 /* 2 * Copyright 2015 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 // This file contains classes that implement RtpReceiverInterface. 12 // An RtpReceiver associates a MediaStreamTrackInterface with an underlying 13 // transport (provided by cricket::VoiceChannel/cricket::VideoChannel) 14 15 #ifndef PC_RTP_RECEIVER_H_ 16 #define PC_RTP_RECEIVER_H_ 17 18 #include <stdint.h> 19 20 #include <string> 21 #include <vector> 22 23 #include "absl/types/optional.h" 24 #include "api/crypto/frame_decryptor_interface.h" 25 #include "api/dtls_transport_interface.h" 26 #include "api/media_stream_interface.h" 27 #include "api/media_types.h" 28 #include "api/rtp_parameters.h" 29 #include "api/rtp_receiver_interface.h" 30 #include "api/scoped_refptr.h" 31 #include "api/video/video_frame.h" 32 #include "api/video/video_sink_interface.h" 33 #include "api/video/video_source_interface.h" 34 #include "media/base/media_channel.h" 35 #include "media/base/video_broadcaster.h" 36 #include "pc/video_track_source.h" 37 #include "rtc_base/thread.h" 38 39 namespace webrtc { 40 41 // Internal class used by PeerConnection. 42 class RtpReceiverInternal : public RtpReceiverInterface { 43 public: 44 // Call on the signaling thread, to let the receiver know that the the 45 // embedded source object should enter a stopped/ended state and the track's 46 // state set to `kEnded`, a final state that cannot be reversed. 47 virtual void Stop() = 0; 48 49 // Sets the underlying MediaEngine channel associated with this RtpSender. 50 // A VoiceMediaChannel should be used for audio RtpSenders and 51 // a VideoMediaChannel should be used for video RtpSenders. 52 // NOTE: 53 // * SetMediaChannel(nullptr) must be called before the media channel is 54 // destroyed. 55 // * This method must be invoked on the worker thread. 56 virtual void SetMediaChannel(cricket::MediaChannel* media_channel) = 0; 57 58 // Configures the RtpReceiver with the underlying media channel, with the 59 // given SSRC as the stream identifier. 60 virtual void SetupMediaChannel(uint32_t ssrc) = 0; 61 62 // Configures the RtpReceiver with the underlying media channel to receive an 63 // unsignaled receive stream. 64 virtual void SetupUnsignaledMediaChannel() = 0; 65 66 virtual void set_transport( 67 rtc::scoped_refptr<DtlsTransportInterface> dtls_transport) = 0; 68 // This SSRC is used as an identifier for the receiver between the API layer 69 // and the WebRtcVideoEngine, WebRtcVoiceEngine layer. 70 virtual uint32_t ssrc() const = 0; 71 72 // Call this to notify the RtpReceiver when the first packet has been received 73 // on the corresponding channel. 74 virtual void NotifyFirstPacketReceived() = 0; 75 76 // Set the associated remote media streams for this receiver. The remote track 77 // will be removed from any streams that are no longer present and added to 78 // any new streams. 79 virtual void set_stream_ids(std::vector<std::string> stream_ids) = 0; 80 // TODO(https://crbug.com/webrtc/9480): Remove SetStreams() in favor of 81 // set_stream_ids() as soon as downstream projects are no longer dependent on 82 // stream objects. 83 virtual void SetStreams( 84 const std::vector<rtc::scoped_refptr<MediaStreamInterface>>& streams) = 0; 85 86 // Returns an ID that changes if the attached track changes, but 87 // otherwise remains constant. Used to generate IDs for stats. 88 // The special value zero means that no track is attached. 89 virtual int AttachmentId() const = 0; 90 91 protected: 92 static int GenerateUniqueId(); 93 94 static std::vector<rtc::scoped_refptr<MediaStreamInterface>> 95 CreateStreamsFromIds(std::vector<std::string> stream_ids); 96 }; 97 98 } // namespace webrtc 99 100 #endif // PC_RTP_RECEIVER_H_ 101