You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
jellyfin/MediaBrowser.Api/Playback/Hls/BaseHlsService.cs

207 lines
8.2 KiB

using MediaBrowser.Common.Extensions;
using MediaBrowser.Common.IO;
using MediaBrowser.Common.MediaInfo;
using MediaBrowser.Common.Net;
using MediaBrowser.Controller;
using MediaBrowser.Controller.Library;
using System;
using System.Collections.Generic;
using System.IO;
using System.Threading.Tasks;
using MediaBrowser.Model.IO;
namespace MediaBrowser.Api.Playback.Hls
{
/// <summary>
/// Class BaseHlsService
/// </summary>
public abstract class BaseHlsService : BaseStreamingService
{
/// <summary>
/// The segment file prefix
/// </summary>
public const string SegmentFilePrefix = "hls-";
protected override string GetOutputFilePath(StreamState state)
{
var folder = ApplicationPaths.EncodedMediaCachePath;
var outputFileExtension = GetOutputFileExtension(state);
return Path.Combine(folder, SegmentFilePrefix + GetCommandLineArguments("dummy\\dummy", state, false).GetMD5() + (outputFileExtension ?? string.Empty).ToLower());
}
/// <summary>
/// Initializes a new instance of the <see cref="BaseStreamingService" /> class.
/// </summary>
/// <param name="appPaths">The app paths.</param>
/// <param name="userManager">The user manager.</param>
/// <param name="libraryManager">The library manager.</param>
/// <param name="isoManager">The iso manager.</param>
/// <param name="mediaEncoder">The media encoder.</param>
protected BaseHlsService(IServerApplicationPaths appPaths, IUserManager userManager, ILibraryManager libraryManager, IIsoManager isoManager, IMediaEncoder mediaEncoder)
: base(appPaths, userManager, libraryManager, isoManager, mediaEncoder)
{
}
/// <summary>
/// Gets the audio arguments.
/// </summary>
/// <param name="state">The state.</param>
/// <returns>System.String.</returns>
protected abstract string GetAudioArguments(StreamState state);
/// <summary>
/// Gets the video arguments.
/// </summary>
/// <param name="state">The state.</param>
/// <param name="performSubtitleConversion">if set to <c>true</c> [perform subtitle conversion].</param>
/// <returns>System.String.</returns>
protected abstract string GetVideoArguments(StreamState state, bool performSubtitleConversion);
/// <summary>
/// Gets the segment file extension.
/// </summary>
/// <param name="state">The state.</param>
/// <returns>System.String.</returns>
protected abstract string GetSegmentFileExtension(StreamState state);
/// <summary>
/// Gets the type of the transcoding job.
/// </summary>
/// <value>The type of the transcoding job.</value>
protected override TranscodingJobType TranscodingJobType
{
get { return TranscodingJobType.Hls; }
}
/// <summary>
/// Processes the request.
/// </summary>
/// <param name="request">The request.</param>
/// <returns>System.Object.</returns>
protected object ProcessRequest(StreamRequest request)
{
var state = GetState(request);
return ProcessRequestAsync(state).Result;
}
/// <summary>
/// Processes the request async.
/// </summary>
/// <param name="state">The state.</param>
/// <returns>Task{System.Object}.</returns>
public async Task<object> ProcessRequestAsync(StreamState state)
{
var playlist = GetOutputFilePath(state);
var isPlaylistNewlyCreated = false;
// If the playlist doesn't already exist, startup ffmpeg
if (!File.Exists(playlist))
{
isPlaylistNewlyCreated = true;
await StartFfMpeg(state, playlist).ConfigureAwait(false);
}
else
{
ApiEntryPoint.Instance.OnTranscodeBeginRequest(playlist, TranscodingJobType.Hls);
}
// Get the current playlist text and convert to bytes
var playlistText = await GetPlaylistFileText(playlist, isPlaylistNewlyCreated).ConfigureAwait(false);
try
{
return ResultFactory.GetResult(playlistText, MimeTypes.GetMimeType("playlist.m3u8"), new Dictionary<string, string>());
}
finally
{
ApiEntryPoint.Instance.OnTranscodeEndRequest(playlist, TranscodingJobType.Hls);
}
}
/// <summary>
/// Gets the current playlist text
/// </summary>
/// <param name="playlist">The path to the playlist</param>
/// <param name="waitForMinimumSegments">Whether or not we should wait until it contains three segments</param>
/// <returns>Task{System.String}.</returns>
private async Task<string> GetPlaylistFileText(string playlist, bool waitForMinimumSegments)
{
string fileText;
while (true)
{
// Need to use FileShare.ReadWrite because we're reading the file at the same time it's being written
using (var fileStream = new FileStream(playlist, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, StreamDefaults.DefaultFileStreamBufferSize, FileOptions.Asynchronous))
{
using (var reader = new StreamReader(fileStream))
{
fileText = await reader.ReadToEndAsync().ConfigureAwait(false);
}
}
if (!waitForMinimumSegments || CountStringOccurrences(fileText, "#EXTINF:") >= 3)
{
break;
}
await Task.Delay(25).ConfigureAwait(false);
}
fileText = fileText.Replace(SegmentFilePrefix, "segments/").Replace(".ts", "/stream.ts").Replace(".aac", "/stream.aac").Replace(".mp3", "/stream.mp3");
// It's considered live while still encoding (EVENT). Once the encoding has finished, it's video on demand (VOD).
var playlistType = fileText.IndexOf("#EXT-X-ENDLIST", StringComparison.OrdinalIgnoreCase) == -1 ? "EVENT" : "VOD";
// Add event type at the top
//fileText = fileText.Replace(allowCacheAttributeName, "#EXT-X-PLAYLIST-TYPE:" + playlistType + Environment.NewLine + allowCacheAttributeName);
return fileText;
}
/// <summary>
/// Count occurrences of strings.
/// </summary>
/// <param name="text">The text.</param>
/// <param name="pattern">The pattern.</param>
/// <returns>System.Int32.</returns>
private static int CountStringOccurrences(string text, string pattern)
{
// Loop through all instances of the string 'text'.
var count = 0;
var i = 0;
while ((i = text.IndexOf(pattern, i, StringComparison.OrdinalIgnoreCase)) != -1)
{
i += pattern.Length;
count++;
}
return count;
}
/// <summary>
/// Gets the command line arguments.
/// </summary>
/// <param name="outputPath">The output path.</param>
/// <param name="state">The state.</param>
/// <param name="performSubtitleConversions">if set to <c>true</c> [perform subtitle conversions].</param>
/// <returns>System.String.</returns>
protected override string GetCommandLineArguments(string outputPath, StreamState state, bool performSubtitleConversions)
{
var probeSize = GetProbeSizeArgument(state.Item);
return string.Format("{0} {1} {2} -i {3}{4} -threads 0 {5} {6} {7} -hls_time 10 -start_number 0 -hls_list_size 1440 \"{8}\"",
probeSize,
GetUserAgentParam(state.Item),
GetFastSeekCommandLineParameter(state.Request),
GetInputArgument(state.Item, state.IsoMount),
GetSlowSeekCommandLineParameter(state.Request),
GetMapArgs(state),
GetVideoArguments(state, performSubtitleConversions),
GetAudioArguments(state),
outputPath
).Trim();
}
}
}