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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_IMPL_H_
#define MODULES_RTP_RTCP_SOURCE_RTCP_TRANSCEIVER_IMPL_H_
#include <map>
#include <memory>
#include <string>
#include <vector>
#include "absl/types/optional.h"
#include "api/array_view.h"
#include "api/units/timestamp.h"
#include "modules/rtp_rtcp/source/rtcp_packet/common_header.h"
#include "modules/rtp_rtcp/source/rtcp_packet/dlrr.h"
#include "modules/rtp_rtcp/source/rtcp_packet/remb.h"
#include "modules/rtp_rtcp/source/rtcp_packet/report_block.h"
#include "modules/rtp_rtcp/source/rtcp_packet/target_bitrate.h"
#include "modules/rtp_rtcp/source/rtcp_transceiver_config.h"
#include "rtc_base/task_utils/repeating_task.h"
#include "system_wrappers/include/ntp_time.h"
namespace webrtc {
//
// Manage incoming and outgoing rtcp messages for multiple BUNDLED streams.
//
// This class is not thread-safe.
class RtcpTransceiverImpl {
public:
explicit RtcpTransceiverImpl(const RtcpTransceiverConfig& config);
RtcpTransceiverImpl(const RtcpTransceiverImpl&) = delete;
RtcpTransceiverImpl& operator=(const RtcpTransceiverImpl&) = delete;
~RtcpTransceiverImpl();
void StopPeriodicTask() { periodic_task_handle_.Stop(); }
void AddMediaReceiverRtcpObserver(uint32_t remote_ssrc,
MediaReceiverRtcpObserver* observer);
void RemoveMediaReceiverRtcpObserver(uint32_t remote_ssrc,
MediaReceiverRtcpObserver* observer);
void SetReadyToSend(bool ready);
void ReceivePacket(rtc::ArrayView<const uint8_t> packet, Timestamp now);
void SendCompoundPacket();
void SetRemb(int64_t bitrate_bps, std::vector<uint32_t> ssrcs);
void UnsetRemb();
// Temporary helpers to send pre-built TransportFeedback rtcp packet.
uint32_t sender_ssrc() const { return config_.feedback_ssrc; }
void SendRawPacket(rtc::ArrayView<const uint8_t> packet);
void SendNack(uint32_t ssrc, std::vector<uint16_t> sequence_numbers);
void SendPictureLossIndication(uint32_t ssrc);
// If new_request is true then requested sequence no. will increase for each
// requested ssrc.
void SendFullIntraRequest(rtc::ArrayView<const uint32_t> ssrcs,
bool new_request);
// SendCombinedRtcpPacket ignores rtcp mode and does not send a compound
// message. https://tools.ietf.org/html/rfc4585#section-3.1
void SendCombinedRtcpPacket(
std::vector<std::unique_ptr<rtcp::RtcpPacket>> rtcp_packets);
private:
class PacketSender;
struct RemoteSenderState;
void HandleReceivedPacket(const rtcp::CommonHeader& rtcp_packet_header,
Timestamp now);
// Individual rtcp packet handlers.
void HandleBye(const rtcp::CommonHeader& rtcp_packet_header);
void HandleSenderReport(const rtcp::CommonHeader& rtcp_packet_header,
Timestamp now);
void HandleExtendedReports(const rtcp::CommonHeader& rtcp_packet_header,
Timestamp now);
// Extended Reports blocks handlers.
void HandleDlrr(const rtcp::Dlrr& dlrr, Timestamp now);
void HandleTargetBitrate(const rtcp::TargetBitrate& target_bitrate,
uint32_t remote_ssrc);
void ReschedulePeriodicCompoundPackets();
void SchedulePeriodicCompoundPackets(int64_t delay_ms);
// Creates compound RTCP packet, as defined in
// https://tools.ietf.org/html/rfc5506#section-2
void CreateCompoundPacket(PacketSender* sender);
// Sends RTCP packets.
void SendPeriodicCompoundPacket();
void SendImmediateFeedback(const rtcp::RtcpPacket& rtcp_packet);
// Generate Report Blocks to be send in Sender or Receiver Report.
std::vector<rtcp::ReportBlock> CreateReportBlocks(Timestamp now);
const RtcpTransceiverConfig config_;
bool ready_to_send_;
absl::optional<rtcp::Remb> remb_;
// TODO(danilchap): Remove entries from remote_senders_ that are no longer
// needed.
std::map<uint32_t, RemoteSenderState> remote_senders_;
RepeatingTaskHandle periodic_task_handle_;
};
} // namespace webrtc
#endif // MODULES_RTP_RTCP_SOURCE_RTCP_TRANSCEIVER_IMPL_H_
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