【HLS】Java实现统计HLS的m3u8清单中所有ts切片的视频持续时长

本章使用两种简单方式使用Java统计HLS的m3u8清单中所有ts切片的视频持续时长。

HLS 协议简单介绍

HLS 的全称是 HTTP Live Streaming，中文常译为“HTTP 实时流媒体协议”。

它是由 苹果公司 提出并主导的基于 HTTP 的流媒体网络传输协议。如今，它已经成为互联网上最主流的流媒体传输协议之一，不仅限于苹果设备，几乎所有平台（包括 Android、智能电视、PC 浏览器等）都支持 HLS。

至于M3U8则是HLS协议的一部分，结构可以参考博主下面引用中的文章，这里不再赘述。

想要了解HLS协议和M3U8清单结构内容可以参考博主另外一篇文章：《【HLS】HLS 协议介绍和
m3u8清单文件结构及TS切片详解》

计算时长

1、正则表达式方式计算时长

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;public class M3U8DurationCalculator {public static double calculateTotalDuration(String m3u8FilePath) throws IOException {double totalDuration = 0.0;Pattern durationPattern = Pattern.compile("#EXTINF:([\\d\\.]+),");try (BufferedReader reader = new BufferedReader(new FileReader(m3u8FilePath))) {String line;while ((line = reader.readLine()) != null) {Matcher matcher = durationPattern.matcher(line);if (matcher.find()) {totalDuration += Double.parseDouble(matcher.group(1));}}}return totalDuration;}public static void main(String[] args) {try {double duration = calculateTotalDuration("playlist.m3u8");System.out.printf("总时长: %.2f 秒\n", duration);System.out.printf("总时长: %.2f 分钟\n", duration / 60);} catch (IOException e) {e.printStackTrace();}}
}

2、逐行解析

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;public class M3U8Parser {public static class DurationResult {private double totalDuration;private int segmentCount;// 构造函数、getter、setterpublic DurationResult(double totalDuration, int segmentCount) {this.totalDuration = totalDuration;this.segmentCount = segmentCount;}public double getTotalDuration() { return totalDuration; }public int getSegmentCount() { return segmentCount; }}public static DurationResult calculateDuration(String m3u8FilePath) throws IOException {double totalDuration = 0.0;int segmentCount = 0;try (BufferedReader reader = new BufferedReader(new FileReader(m3u8FilePath))) {String line;while ((line = reader.readLine()) != null) {line = line.trim();if (line.startsWith("#EXTINF:")) {String durationStr = extractDuration(line);if (durationStr != null) {try {double duration = Double.parseDouble(durationStr);totalDuration += duration;segmentCount++;} catch (NumberFormatException e) {System.err.println("无效的时长格式: " + durationStr);}}}}}return new DurationResult(totalDuration, segmentCount);}private static String extractDuration(String extinfLine) {// 格式: #EXTINF:duration,[title]String content = extinfLine.substring(8); // 移除 "#EXTINF:"int commaIndex = content.indexOf(',');if (commaIndex != -1) {return content.substring(0, commaIndex);}return content;}public static void main(String[] args) {try {DurationResult result = calculateDuration("playlist.m3u8");System.out.println("解析结果:");System.out.println("TS片段数量: " + result.getSegmentCount());System.out.printf("总时长: %.2f 秒\n", result.getTotalDuration());System.out.printf("总时长: %.2f 分钟\n", result.getTotalDuration() / 60);// 格式化输出为 HH:mm:ssformatTime(result.getTotalDuration());} catch (IOException e) {e.printStackTrace();}}private static void formatTime(double totalSeconds) {int hours = (int) (totalSeconds / 3600);int minutes = (int) ((totalSeconds % 3600) / 60);int seconds = (int) (totalSeconds % 60);System.out.printf("总时长: %02d:%02d:%02d\n", hours, minutes, seconds);}
}