jellyfin/MediaBrowser.Api/Playback/Hls/BaseHlsService.cs
2020-04-15 11:05:32 +02:00

343 lines
14 KiB
C#

using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Devices;
using MediaBrowser.Controller.Dlna;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.MediaEncoding;
using MediaBrowser.Controller.Net;
using MediaBrowser.Model.Configuration;
using MediaBrowser.Model.IO;
using MediaBrowser.Model.Net;
using MediaBrowser.Model.Serialization;
using Microsoft.Extensions.Logging;
namespace MediaBrowser.Api.Playback.Hls
{
/// <summary>
/// Class BaseHlsService
/// </summary>
public abstract class BaseHlsService : BaseStreamingService
{
public BaseHlsService(
ILogger logger,
IServerConfigurationManager serverConfigurationManager,
IHttpResultFactory httpResultFactory,
IUserManager userManager,
ILibraryManager libraryManager,
IIsoManager isoManager,
IMediaEncoder mediaEncoder,
IFileSystem fileSystem,
IDlnaManager dlnaManager,
IDeviceManager deviceManager,
IMediaSourceManager mediaSourceManager,
IJsonSerializer jsonSerializer,
IAuthorizationContext authorizationContext,
EncodingHelper encodingHelper)
: base(
logger,
serverConfigurationManager,
httpResultFactory,
userManager,
libraryManager,
isoManager,
mediaEncoder,
fileSystem,
dlnaManager,
deviceManager,
mediaSourceManager,
jsonSerializer,
authorizationContext,
encodingHelper)
{
}
/// <summary>
/// Gets the audio arguments.
/// </summary>
protected abstract string GetAudioArguments(StreamState state, EncodingOptions encodingOptions);
/// <summary>
/// Gets the video arguments.
/// </summary>
protected abstract string GetVideoArguments(StreamState state, EncodingOptions encodingOptions);
/// <summary>
/// Gets the segment file extension.
/// </summary>
protected string GetSegmentFileExtension(StreamRequest request)
{
var segmentContainer = request.SegmentContainer;
if (!string.IsNullOrWhiteSpace(segmentContainer))
{
return "." + segmentContainer;
}
return ".ts";
}
/// <summary>
/// Gets the type of the transcoding job.
/// </summary>
/// <value>The type of the transcoding job.</value>
protected override TranscodingJobType TranscodingJobType => TranscodingJobType.Hls;
/// <summary>
/// Processes the request async.
/// </summary>
/// <param name="request">The request.</param>
/// <param name="isLive">if set to <c>true</c> [is live].</param>
/// <returns>Task{System.Object}.</returns>
/// <exception cref="ArgumentException">A video bitrate is required
/// or
/// An audio bitrate is required</exception>
protected async Task<object> ProcessRequestAsync(StreamRequest request, bool isLive)
{
var cancellationTokenSource = new CancellationTokenSource();
var state = await GetState(request, cancellationTokenSource.Token).ConfigureAwait(false);
TranscodingJob job = null;
var playlist = state.OutputFilePath;
if (!File.Exists(playlist))
{
var transcodingLock = ApiEntryPoint.Instance.GetTranscodingLock(playlist);
await transcodingLock.WaitAsync(cancellationTokenSource.Token).ConfigureAwait(false);
try
{
if (!File.Exists(playlist))
{
// If the playlist doesn't already exist, startup ffmpeg
try
{
job = await StartFfMpeg(state, playlist, cancellationTokenSource).ConfigureAwait(false);
job.IsLiveOutput = isLive;
}
catch
{
state.Dispose();
throw;
}
var minSegments = state.MinSegments;
if (minSegments > 0)
{
await WaitForMinimumSegmentCount(playlist, minSegments, cancellationTokenSource.Token).ConfigureAwait(false);
}
}
}
finally
{
transcodingLock.Release();
}
}
if (isLive)
{
job ??= ApiEntryPoint.Instance.OnTranscodeBeginRequest(playlist, TranscodingJobType);
if (job != null)
{
ApiEntryPoint.Instance.OnTranscodeEndRequest(job);
}
return ResultFactory.GetResult(GetLivePlaylistText(playlist, state.SegmentLength), MimeTypes.GetMimeType("playlist.m3u8"), new Dictionary<string, string>());
}
var audioBitrate = state.OutputAudioBitrate ?? 0;
var videoBitrate = state.OutputVideoBitrate ?? 0;
var baselineStreamBitrate = 64000;
var playlistText = GetMasterPlaylistFileText(playlist, videoBitrate + audioBitrate, baselineStreamBitrate);
job ??= ApiEntryPoint.Instance.OnTranscodeBeginRequest(playlist, TranscodingJobType);
if (job != null)
{
ApiEntryPoint.Instance.OnTranscodeEndRequest(job);
}
return ResultFactory.GetResult(playlistText, MimeTypes.GetMimeType("playlist.m3u8"), new Dictionary<string, string>());
}
private string GetLivePlaylistText(string path, int segmentLength)
{
using var stream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
using var reader = new StreamReader(stream);
var text = reader.ReadToEnd();
text = text.Replace("#EXTM3U", "#EXTM3U\n#EXT-X-PLAYLIST-TYPE:EVENT");
var newDuration = "#EXT-X-TARGETDURATION:" + segmentLength.ToString(CultureInfo.InvariantCulture);
text = text.Replace("#EXT-X-TARGETDURATION:" + (segmentLength - 1).ToString(CultureInfo.InvariantCulture), newDuration, StringComparison.OrdinalIgnoreCase);
//text = text.Replace("#EXT-X-TARGETDURATION:" + (segmentLength + 1).ToString(CultureInfo.InvariantCulture), newDuration, StringComparison.OrdinalIgnoreCase);
return text;
}
private string GetMasterPlaylistFileText(string firstPlaylist, int bitrate, int baselineStreamBitrate)
{
var builder = new StringBuilder();
builder.AppendLine("#EXTM3U");
// Pad a little to satisfy the apple hls validator
var paddedBitrate = Convert.ToInt32(bitrate * 1.15);
// Main stream
builder.AppendLine("#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=" + paddedBitrate.ToString(CultureInfo.InvariantCulture));
var playlistUrl = "hls/" + Path.GetFileName(firstPlaylist).Replace(".m3u8", "/stream.m3u8");
builder.AppendLine(playlistUrl);
return builder.ToString();
}
protected virtual async Task WaitForMinimumSegmentCount(string playlist, int segmentCount, CancellationToken cancellationToken)
{
Logger.LogDebug("Waiting for {0} segments in {1}", segmentCount, playlist);
while (!cancellationToken.IsCancellationRequested)
{
try
{
// Need to use FileShare.ReadWrite because we're reading the file at the same time it's being written
var fileStream = GetPlaylistFileStream(playlist);
await using (fileStream.ConfigureAwait(false))
{
using var reader = new StreamReader(fileStream);
var count = 0;
while (!reader.EndOfStream)
{
var line = await reader.ReadLineAsync().ConfigureAwait(false);
if (line.IndexOf("#EXTINF:", StringComparison.OrdinalIgnoreCase) != -1)
{
count++;
if (count >= segmentCount)
{
Logger.LogDebug("Finished waiting for {0} segments in {1}", segmentCount, playlist);
return;
}
}
}
}
await Task.Delay(100, cancellationToken).ConfigureAwait(false);
}
catch (IOException)
{
// May get an error if the file is locked
}
await Task.Delay(50, cancellationToken).ConfigureAwait(false);
}
}
protected Stream GetPlaylistFileStream(string path)
{
return new FileStream(
path,
FileMode.Open,
FileAccess.Read,
FileShare.ReadWrite,
IODefaults.FileStreamBufferSize,
FileOptions.SequentialScan);
}
protected override string GetCommandLineArguments(string outputPath, EncodingOptions encodingOptions, StreamState state, bool isEncoding)
{
var itsOffsetMs = 0;
var itsOffset = itsOffsetMs == 0 ? string.Empty : string.Format("-itsoffset {0} ", TimeSpan.FromMilliseconds(itsOffsetMs).TotalSeconds.ToString(CultureInfo.InvariantCulture));
var videoCodec = EncodingHelper.GetVideoEncoder(state, encodingOptions);
var threads = EncodingHelper.GetNumberOfThreads(state, encodingOptions, videoCodec);
var inputModifier = EncodingHelper.GetInputModifier(state, encodingOptions);
// If isEncoding is true we're actually starting ffmpeg
var startNumberParam = isEncoding ? GetStartNumber(state).ToString(CultureInfo.InvariantCulture) : "0";
var baseUrlParam = string.Empty;
if (state.Request is GetLiveHlsStream)
{
baseUrlParam = string.Format(" -hls_base_url \"{0}/\"",
"hls/" + Path.GetFileNameWithoutExtension(outputPath));
}
var useGenericSegmenter = true;
if (useGenericSegmenter)
{
var outputTsArg = Path.Combine(Path.GetDirectoryName(outputPath), Path.GetFileNameWithoutExtension(outputPath)) + "%d" + GetSegmentFileExtension(state.Request);
var timeDeltaParam = string.Empty;
var segmentFormat = GetSegmentFileExtension(state.Request).TrimStart('.');
if (string.Equals(segmentFormat, "ts", StringComparison.OrdinalIgnoreCase))
{
segmentFormat = "mpegts";
}
baseUrlParam = string.Format("\"{0}/\"", "hls/" + Path.GetFileNameWithoutExtension(outputPath));
return string.Format("{0} {1} -map_metadata -1 -map_chapters -1 -threads {2} {3} {4} {5} -f segment -max_delay 5000000 -avoid_negative_ts disabled -start_at_zero -segment_time {6} {10} -individual_header_trailer 0 -segment_format {11} -segment_list_entry_prefix {12} -segment_list_type m3u8 -segment_start_number {7} -segment_list \"{8}\" -y \"{9}\"",
inputModifier,
EncodingHelper.GetInputArgument(state, encodingOptions),
threads,
EncodingHelper.GetMapArgs(state),
GetVideoArguments(state, encodingOptions),
GetAudioArguments(state, encodingOptions),
state.SegmentLength.ToString(CultureInfo.InvariantCulture),
startNumberParam,
outputPath,
outputTsArg,
timeDeltaParam,
segmentFormat,
baseUrlParam
).Trim();
}
// add when stream copying?
// -avoid_negative_ts make_zero -fflags +genpts
var args = string.Format("{0} {1} {2} -map_metadata -1 -map_chapters -1 -threads {3} {4} {5} -max_delay 5000000 -avoid_negative_ts disabled -start_at_zero {6} -hls_time {7} -individual_header_trailer 0 -start_number {8} -hls_list_size {9}{10} -y \"{11}\"",
itsOffset,
inputModifier,
EncodingHelper.GetInputArgument(state, encodingOptions),
threads,
EncodingHelper.GetMapArgs(state),
GetVideoArguments(state, encodingOptions),
GetAudioArguments(state, encodingOptions),
state.SegmentLength.ToString(CultureInfo.InvariantCulture),
startNumberParam,
state.HlsListSize.ToString(CultureInfo.InvariantCulture),
baseUrlParam,
outputPath
).Trim();
return args;
}
protected override string GetDefaultEncoderPreset()
{
return "veryfast";
}
protected virtual int GetStartNumber(StreamState state)
{
return 0;
}
}
}