mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-26 20:47:08 +08:00
144 lines
4.1 KiB
C++
144 lines
4.1 KiB
C++
/*
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* Copyright (c) 2016-present The ZLMediaKit project authors. All Rights Reserved.
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*
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* This file is part of ZLMediaKit(https://github.com/ZLMediaKit/ZLMediaKit).
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*
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* Use of this source code is governed by MIT-like license that can be found in the
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* LICENSE file in the root of the source tree. All contributing project authors
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* may be found in the AUTHORS file in the root of the source tree.
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*/
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#include "Common/config.h"
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#include "RtpReceiver.h"
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namespace mediakit {
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RtpTrack::RtpTrack() {
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setOnSort([this](uint16_t seq, RtpPacket::Ptr packet) {
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onRtpSorted(std::move(packet));
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});
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}
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uint32_t RtpTrack::getSSRC() const {
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return _ssrc;
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}
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void RtpTrack::clear() {
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_ssrc = 0;
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_ssrc_alive.resetTime();
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PacketSortor<RtpPacket::Ptr>::clear();
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}
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RtpPacket::Ptr RtpTrack::inputRtp(TrackType type, int sample_rate, uint8_t *ptr, size_t len) {
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if (len < RtpPacket::kRtpHeaderSize) {
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throw BadRtpException("rtp size less than 12");
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}
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GET_CONFIG(uint32_t, rtpMaxSize, Rtp::kRtpMaxSize);
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if (len > 1024 * rtpMaxSize) {
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WarnL << "超大的rtp包:" << len << " > " << 1024 * rtpMaxSize;
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return nullptr;
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}
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if (!sample_rate) {
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//无法把时间戳转换成毫秒
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return nullptr;
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}
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RtpHeader *header = (RtpHeader *) ptr;
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if (header->version != RtpPacket::kRtpVersion) {
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throw BadRtpException("invalid rtp version");
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}
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if (header->getPayloadSize(len) < 0) {
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//rtp有效负载小于0，非法
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throw BadRtpException("invalid rtp payload size");
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}
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//比对缓存ssrc
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auto ssrc = ntohl(header->ssrc);
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if (_pt == 0xFF) {
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_pt = header->pt;
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} else if (header->pt != _pt) {
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//TraceL << "rtp pt mismatch:" << (int) header->pt << " !=" << (int) _pt;
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return nullptr;
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}
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if (!_ssrc) {
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//记录并锁定ssrc
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_ssrc = ssrc;
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_ssrc_alive.resetTime();
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} else if (_ssrc == ssrc) {
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//ssrc匹配正确,刷新计时器
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_ssrc_alive.resetTime();
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} else {
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//ssrc错误
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if (_ssrc_alive.elapsedTime() < 3 * 1000) {
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//接收正确ssrc的rtp在10秒内，那么我们认为存在多路rtp,忽略掉ssrc不匹配的rtp
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WarnL << "ssrc mismatch, rtp dropped:" << ssrc << " != " << _ssrc;
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return nullptr;
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}
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InfoL << "rtp ssrc changed:" << _ssrc << " -> " << ssrc;
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_ssrc = ssrc;
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_ssrc_alive.resetTime();
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}
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auto rtp = RtpPacket::create();
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//需要添加4个字节的rtp over tcp头
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rtp->setCapacity(RtpPacket::kRtpTcpHeaderSize + len);
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rtp->setSize(RtpPacket::kRtpTcpHeaderSize + len);
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rtp->sample_rate = sample_rate;
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rtp->type = type;
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//赋值4个字节的rtp over tcp头
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uint8_t *data = (uint8_t *) rtp->data();
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data[0] = '$';
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data[1] = 2 * type;
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data[2] = (len >> 8) & 0xFF;
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data[3] = len & 0xFF;
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//拷贝rtp
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memcpy(&data[4], ptr, len);
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if (_disable_ntp) {
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//不支持ntp时间戳，例如国标推流，那么直接使用rtp时间戳
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rtp->ntp_stamp = rtp->getStamp() * uint64_t(1000) / sample_rate;
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} else {
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//设置ntp时间戳
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rtp->ntp_stamp = _ntp_stamp.getNtpStamp(rtp->getStamp(), sample_rate);
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}
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onBeforeRtpSorted(rtp);
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sortPacket(rtp->getSeq(), rtp);
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return rtp;
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}
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void RtpTrack::setNtpStamp(uint32_t rtp_stamp, uint64_t ntp_stamp_ms) {
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_disable_ntp = rtp_stamp == 0 && ntp_stamp_ms == 0;
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if (!_disable_ntp) {
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_ntp_stamp.setNtpStamp(rtp_stamp, ntp_stamp_ms);
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}
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}
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void RtpTrack::setPayloadType(uint8_t pt) {
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_pt = pt;
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}
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////////////////////////////////////////////////////////////////////////////////////
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void RtpTrackImp::setOnSorted(OnSorted cb) {
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_on_sorted = std::move(cb);
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}
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void RtpTrackImp::setBeforeSorted(BeforeSorted cb) {
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_on_before_sorted = std::move(cb);
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}
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void RtpTrackImp::onRtpSorted(RtpPacket::Ptr rtp) {
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if (_on_sorted) {
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_on_sorted(std::move(rtp));
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}
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}
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void RtpTrackImp::onBeforeRtpSorted(const RtpPacket::Ptr &rtp) {
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if (_on_before_sorted) {
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_on_before_sorted(rtp);
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}
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}
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}//namespace mediakit
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