153 lines
4.6 KiB
C++
153 lines
4.6 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 "HlsMaker.h"
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namespace mediakit {
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HlsMaker::HlsMaker(float seg_duration, uint32_t seg_number) {
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//最小允许设置为0，0个切片代表点播
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_seg_number = seg_number;
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_seg_duration = seg_duration;
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}
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HlsMaker::~HlsMaker() {
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}
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void HlsMaker::makeIndexFile(bool eof) {
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char file_content[1024];
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int maxSegmentDuration = 0;
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for (auto &tp : _seg_dur_list) {
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int dur = std::get<0>(tp);
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if (dur > maxSegmentDuration) {
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maxSegmentDuration = dur;
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}
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}
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auto sequence = _seg_number ? (_file_index > _seg_number ? _file_index - _seg_number : 0LL) : 0LL;
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string m3u8;
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if (_seg_number == 0) {
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// 录像点播支持时移
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snprintf(file_content, sizeof(file_content),
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"#EXTM3U\n"
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"#EXT-X-PLAYLIST-TYPE:EVENT\n"
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"#EXT-X-VERSION:4\n"
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"#EXT-X-TARGETDURATION:%u\n"
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"#EXT-X-MEDIA-SEQUENCE:%llu\n",
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(maxSegmentDuration + 999) / 1000,
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sequence);
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} else {
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snprintf(file_content, sizeof(file_content),
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"#EXTM3U\n"
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"#EXT-X-VERSION:3\n"
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"#EXT-X-ALLOW-CACHE:NO\n"
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"#EXT-X-TARGETDURATION:%u\n"
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"#EXT-X-MEDIA-SEQUENCE:%llu\n",
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(maxSegmentDuration + 999) / 1000,
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sequence);
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}
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m3u8.assign(file_content);
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for (auto &tp : _seg_dur_list) {
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snprintf(file_content, sizeof(file_content), "#EXTINF:%.3f,\n%s\n", std::get<0>(tp) / 1000.0, std::get<1>(tp).data());
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m3u8.append(file_content);
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}
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if (eof) {
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snprintf(file_content, sizeof(file_content), "#EXT-X-ENDLIST\n");
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m3u8.append(file_content);
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}
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onWriteHls(m3u8.data(), m3u8.size());
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}
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void HlsMaker::inputData(void *data, size_t len, uint32_t timestamp, bool is_idr_fast_packet) {
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if (data && len) {
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if (is_idr_fast_packet) {
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//尝试切片ts
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addNewSegment(timestamp);
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}
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if (!_last_file_name.empty()) {
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//存在切片才写入ts数据
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onWriteSegment((char *) data, len);
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_last_timestamp = timestamp;
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}
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} else {
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//resetTracks时触发此逻辑
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flushLastSegment(true);
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}
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}
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void HlsMaker::delOldSegment() {
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if (_seg_number == 0) {
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//如果设置为保留0个切片，则认为是保存为点播
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return;
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}
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//在hls m3u8索引文件中,我们保存的切片个数跟_seg_number相关设置一致
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if (_file_index > _seg_number) {
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_seg_dur_list.pop_front();
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}
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GET_CONFIG(uint32_t, segRetain, Hls::kSegmentRetain);
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//但是实际保存的切片个数比m3u8所述多若干个,这样做的目的是防止播放器在切片删除前能下载完毕
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if (_file_index > _seg_number + segRetain) {
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onDelSegment(_file_index - _seg_number - segRetain - 1);
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}
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}
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void HlsMaker::addNewSegment(uint32_t stamp) {
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if (!_last_file_name.empty() && stamp - _last_seg_timestamp < _seg_duration * 1000) {
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//存在上个切片，并且未到分片时间
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return;
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}
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//关闭并保存上一个切片，如果_seg_number==0,那么是点播。
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flushLastSegment(false);
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//新增切片
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_last_file_name = onOpenSegment(_file_index++);
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//记录本次切片的起始时间戳
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_last_seg_timestamp = _last_timestamp ? _last_timestamp : stamp;
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}
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void HlsMaker::flushLastSegment(bool eof){
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if (_last_file_name.empty()) {
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//不存在上个切片
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return;
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}
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//文件创建到最后一次数据写入的时间即为切片长度
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auto seg_dur = _last_timestamp - _last_seg_timestamp;
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if (seg_dur <= 0) {
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seg_dur = 100;
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}
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_seg_dur_list.push_back(std::make_tuple(seg_dur, std::move(_last_file_name)));
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_last_file_name.clear();
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delOldSegment();
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//先flush ts切片，否则可能存在ts文件未写入完毕就被访问的情况
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onFlushLastSegment(seg_dur);
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//然后写m3u8文件
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makeIndexFile(eof);
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}
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bool HlsMaker::isLive() {
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return _seg_number != 0;
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}
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void HlsMaker::clear() {
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_file_index = 0;
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_last_seg_timestamp = 0;
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_seg_dur_list.clear();
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_last_file_name.clear();
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}
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}//namespace mediakit
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