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/*
* Copyright (c) 2017 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.
*/
#ifndef MODULES_RTP_RTCP_SOURCE_RTCP_TRANSCEIVER_H_
#define MODULES_RTP_RTCP_SOURCE_RTCP_TRANSCEIVER_H_
#include <memory>
#include <string>
#include <vector>
#include "modules/rtp_rtcp/source/rtcp_transceiver_config.h"
#include "modules/rtp_rtcp/source/rtcp_transceiver_impl.h"
#include "rtc_base/constructormagic.h"
#include "rtc_base/copyonwritebuffer.h"
#include "rtc_base/task_queue.h"
#include "rtc_base/weak_ptr.h"
namespace webrtc {
//
// Manage incoming and outgoing rtcp messages for multiple BUNDLED streams.
//
// This class is thread-safe wrapper of RtcpTransceiverImpl
class RtcpTransceiver : public RtcpFeedbackSenderInterface {
public:
explicit RtcpTransceiver(const RtcpTransceiverConfig& config);
~RtcpTransceiver() override;
// Registers observer to be notified about incoming rtcp packets.
// Calls to observer will be done on the |config.task_queue|.
void AddMediaReceiverRtcpObserver(uint32_t remote_ssrc,
MediaReceiverRtcpObserver* observer);
// Deregisters the observer. Might return before observer is deregistered.
// Posts |on_removed| task when observer is deregistered.
void RemoveMediaReceiverRtcpObserver(
uint32_t remote_ssrc,
MediaReceiverRtcpObserver* observer,
std::unique_ptr<rtc::QueuedTask> on_removed);
// Handles incoming rtcp packets.
void ReceivePacket(rtc::CopyOnWriteBuffer packet);
// Sends RTCP packets starting with a sender or receiver report.
void SendCompoundPacket();
// (REMB) Receiver Estimated Max Bitrate.
// Includes REMB in following compound packets.
void SetRemb(int64_t bitrate_bps, std::vector<uint32_t> ssrcs) override;
// Stops sending REMB in following compound packets.
void UnsetRemb() override;
// TODO(bugs.webrtc.org/8239): Remove SendFeedbackPacket and SSRC functions
// and move generating of the TransportFeedback message inside
// RtcpTransceiverImpl when there is one RtcpTransceiver per rtp transport.
// Returns ssrc to put as sender ssrc into rtcp::TransportFeedback.
uint32_t SSRC() const override;
bool SendFeedbackPacket(const rtcp::TransportFeedback& packet) override;
// Reports missing packets, https://tools.ietf.org/html/rfc4585#section-6.2.1
void SendNack(uint32_t ssrc, std::vector<uint16_t> sequence_numbers);
// Requests new key frame.
// using PLI, https://tools.ietf.org/html/rfc4585#section-6.3.1.1
void SendPictureLossIndication(uint32_t ssrc);
// using FIR, https://tools.ietf.org/html/rfc5104#section-4.3.1.2
void SendFullIntraRequest(std::vector<uint32_t> ssrcs);
private:
rtc::TaskQueue* const task_queue_;
std::unique_ptr<RtcpTransceiverImpl> rtcp_transceiver_;
rtc::WeakPtrFactory<RtcpTransceiverImpl> ptr_factory_;
// TaskQueue, and thus tasks posted to it, may outlive this.
// Thus when Posting task class always pass copy of the weak_ptr to access
// the RtcpTransceiver and never guarantee it still will be alive when task
// runs.
rtc::WeakPtr<RtcpTransceiverImpl> ptr_;
RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(RtcpTransceiver);
};
} // namespace webrtc
#endif // MODULES_RTP_RTCP_SOURCE_RTCP_TRANSCEIVER_H_