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/ref_counted_object.h" 38 #include "rtc_base/thread.h" 39 40 namespace webrtc { 41 42 // Internal class used by PeerConnection. 43 class RtpReceiverInternal : public RtpReceiverInterface { 44 public: 45 // Stops receiving. The track may be reactivated. 46 virtual void Stop() = 0; 47 // Stops the receiver permanently. 48 // Causes the associated track to enter kEnded state. Cannot be reversed. 49 virtual void StopAndEndTrack() = 0; 50 51 // Sets the underlying MediaEngine channel associated with this RtpSender. 52 // A VoiceMediaChannel should be used for audio RtpSenders and 53 // a VideoMediaChannel should be used for video RtpSenders. 54 // Must call SetMediaChannel(nullptr) before the media channel is destroyed. 55 virtual void SetMediaChannel(cricket::MediaChannel* media_channel) = 0; 56 57 // Configures the RtpReceiver with the underlying media channel, with the 58 // given SSRC as the stream identifier. 59 virtual void SetupMediaChannel(uint32_t ssrc) = 0; 60 61 // Configures the RtpReceiver with the underlying media channel to receive an 62 // unsignaled receive stream. 63 virtual void SetupUnsignaledMediaChannel() = 0; 64 65 virtual void set_transport( 66 rtc::scoped_refptr<DtlsTransportInterface> dtls_transport) = 0; 67 // This SSRC is used as an identifier for the receiver between the API layer 68 // and the WebRtcVideoEngine, WebRtcVoiceEngine layer. 69 virtual uint32_t ssrc() const = 0; 70 71 // Call this to notify the RtpReceiver when the first packet has been received 72 // on the corresponding channel. 73 virtual void NotifyFirstPacketReceived() = 0; 74 75 // Set the associated remote media streams for this receiver. The remote track 76 // will be removed from any streams that are no longer present and added to 77 // any new streams. 78 virtual void set_stream_ids(std::vector<std::string> stream_ids) = 0; 79 // TODO(https://crbug.com/webrtc/9480): Remove SetStreams() in favor of 80 // set_stream_ids() as soon as downstream projects are no longer dependent on 81 // stream objects. 82 virtual void SetStreams( 83 const std::vector<rtc::scoped_refptr<MediaStreamInterface>>& streams) = 0; 84 85 // Returns an ID that changes if the attached track changes, but 86 // otherwise remains constant. Used to generate IDs for stats. 87 // The special value zero means that no track is attached. 88 virtual int AttachmentId() const = 0; 89 90 protected: 91 static int GenerateUniqueId(); 92 93 static std::vector<rtc::scoped_refptr<MediaStreamInterface>> 94 CreateStreamsFromIds(std::vector<std::string> stream_ids); 95 96 static void MaybeAttachFrameDecryptorToMediaChannel( 97 const absl::optional<uint32_t>& ssrc, 98 rtc::Thread* worker_thread, 99 rtc::scoped_refptr<webrtc::FrameDecryptorInterface> frame_decryptor, 100 cricket::MediaChannel* media_channel, 101 bool stopped); 102 }; 103 104 } // namespace webrtc 105 106 #endif // PC_RTP_RECEIVER_H_ 107