mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-26 04:31:37 +08:00
102 lines
3.0 KiB
C++
102 lines
3.0 KiB
C++
/*
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* Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
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*
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* This file is part of ZLMediaKit(https://github.com/xia-chu/ZLMediaKit).
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*
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* Use of this source code is governed by MIT 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 "RtspMuxer.h"
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#include "Extension/Factory.h"
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namespace mediakit {
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void RtspMuxer::onRtp(RtpPacket::Ptr in, bool is_key) {
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if (_live) {
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if (_rtp_stamp[in->type] != in->getHeader()->stamp) {
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//rtp时间戳变化才计算ntp，节省cpu资源
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int64_t stamp_ms = in->getStamp() * uint64_t(1000) / in->sample_rate;
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int64_t stamp_ms_inc;
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//求rtp时间戳增量
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_stamp[in->type].revise(stamp_ms, stamp_ms, stamp_ms_inc, stamp_ms_inc);
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_rtp_stamp[in->type] = in->getHeader()->stamp;
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_ntp_stamp[in->type] = stamp_ms_inc + _ntp_stamp_start;
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}
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//rtp拦截入口，此处统一赋值ntp
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in->ntp_stamp = _ntp_stamp[in->type];
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} else {
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//点播情况下设置ntp时间戳为rtp时间戳加基准ntp时间戳
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in->ntp_stamp = _ntp_stamp_start + (in->getStamp() * uint64_t(1000) / in->sample_rate);
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}
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_rtpRing->write(std::move(in), is_key);
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}
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RtspMuxer::RtspMuxer(const TitleSdp::Ptr &title) {
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if (!title) {
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_sdp = std::make_shared<TitleSdp>()->getSdp();
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} else {
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_live = title->getDuration() == 0;
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_sdp = title->getSdp();
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}
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_rtpRing = std::make_shared<RtpRing::RingType>();
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_rtpInterceptor = std::make_shared<RtpRing::RingType>();
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_rtpInterceptor->setDelegate(std::make_shared<RingDelegateHelper>([this](RtpPacket::Ptr in, bool is_key) {
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onRtp(std::move(in), is_key);
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}));
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_ntp_stamp_start = getCurrentMillisecond(true);
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}
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bool RtspMuxer::addTrack(const Track::Ptr &track) {
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//根据track生成sdp
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Sdp::Ptr sdp = track->getSdp();
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if (!sdp) {
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return false;
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}
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auto &encoder = _encoder[track->getTrackType()];
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encoder = Factory::getRtpEncoderBySdp(sdp);
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if (!encoder) {
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return false;
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}
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//设置rtp输出环形缓存
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encoder->setRtpRing(_rtpInterceptor);
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//添加其sdp
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_sdp.append(sdp->getSdp());
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trySyncTrack();
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return true;
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}
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void RtspMuxer::trySyncTrack() {
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if (_encoder[TrackAudio] && _encoder[TrackVideo]) {
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//音频时间戳同步于视频，因为音频时间戳被修改后不影响播放
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_stamp[TrackAudio].syncTo(_stamp[TrackVideo]);
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}
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}
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bool RtspMuxer::inputFrame(const Frame::Ptr &frame) {
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auto &encoder = _encoder[frame->getTrackType()];
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return encoder ? encoder->inputFrame(frame) : false;
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}
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string RtspMuxer::getSdp() {
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return _sdp;
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}
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RtpRing::RingType::Ptr RtspMuxer::getRtpRing() const {
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return _rtpRing;
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}
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void RtspMuxer::resetTracks() {
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_sdp.clear();
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for (auto &encoder : _encoder) {
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encoder = nullptr;
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}
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}
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} /* namespace mediakit */ |