101 lines
4.2 KiB
C#
101 lines
4.2 KiB
C#
using System;
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using System.Globalization;
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using System.IO;
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using System.Threading;
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using System.Threading.Tasks;
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using MediaBrowser.Model.IO;
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using Microsoft.Extensions.Logging;
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namespace Jellyfin.Api.Helpers
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{
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/// <summary>
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/// The hls helpers.
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/// </summary>
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public static class HlsHelpers
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{
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/// <summary>
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/// Waits for a minimum number of segments to be available.
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/// </summary>
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/// <param name="playlist">The playlist string.</param>
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/// <param name="segmentCount">The segment count.</param>
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/// <param name="logger">Instance of the <see cref="ILogger"/> interface.</param>
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/// <param name="cancellationToken">The <see cref="CancellationToken"/>.</param>
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/// <returns>A <see cref="Task"/> indicating the waiting process.</returns>
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public static async Task WaitForMinimumSegmentCount(string playlist, int? segmentCount, ILogger logger, CancellationToken cancellationToken)
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{
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logger.LogDebug("Waiting for {0} segments in {1}", segmentCount, playlist);
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while (!cancellationToken.IsCancellationRequested)
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{
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try
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{
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// Need to use FileShare.ReadWrite because we're reading the file at the same time it's being written
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var fileStream = new FileStream(
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playlist,
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FileMode.Open,
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FileAccess.Read,
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FileShare.ReadWrite,
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IODefaults.FileStreamBufferSize,
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FileOptions.SequentialScan);
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await using (fileStream.ConfigureAwait(false))
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{
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using var reader = new StreamReader(fileStream);
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var count = 0;
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while (!reader.EndOfStream)
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{
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var line = await reader.ReadLineAsync().ConfigureAwait(false);
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if (line == null)
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{
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// Nothing currently in buffer.
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break;
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}
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if (line.IndexOf("#EXTINF:", StringComparison.OrdinalIgnoreCase) != -1)
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{
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count++;
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if (count >= segmentCount)
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{
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logger.LogDebug("Finished waiting for {0} segments in {1}", segmentCount, playlist);
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return;
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}
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}
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}
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}
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await Task.Delay(100, cancellationToken).ConfigureAwait(false);
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}
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catch (IOException)
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{
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// May get an error if the file is locked
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}
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await Task.Delay(50, cancellationToken).ConfigureAwait(false);
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}
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}
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/// <summary>
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/// Gets the hls playlist text.
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/// </summary>
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/// <param name="path">The path to the playlist file.</param>
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/// <param name="segmentLength">The segment length.</param>
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/// <returns>The playlist text as a string.</returns>
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public static string GetLivePlaylistText(string path, int segmentLength)
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{
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using var stream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
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using var reader = new StreamReader(stream);
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var text = reader.ReadToEnd();
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text = text.Replace("#EXTM3U", "#EXTM3U\n#EXT-X-PLAYLIST-TYPE:EVENT", StringComparison.InvariantCulture);
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var newDuration = "#EXT-X-TARGETDURATION:" + segmentLength.ToString(CultureInfo.InvariantCulture);
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text = text.Replace("#EXT-X-TARGETDURATION:" + (segmentLength - 1).ToString(CultureInfo.InvariantCulture), newDuration, StringComparison.OrdinalIgnoreCase);
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// text = text.Replace("#EXT-X-TARGETDURATION:" + (segmentLength + 1).ToString(CultureInfo.InvariantCulture), newDuration, StringComparison.OrdinalIgnoreCase);
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return text;
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}
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}
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}
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