1231 lines
48 KiB
C#
1231 lines
48 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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using MediaBrowser.Common.Net;
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using MediaBrowser.Controller.Configuration;
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using MediaBrowser.Controller.Devices;
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using MediaBrowser.Controller.Dlna;
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using MediaBrowser.Controller.Library;
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using MediaBrowser.Controller.MediaEncoding;
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using MediaBrowser.Controller.Net;
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using MediaBrowser.Model.Configuration;
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using MediaBrowser.Model.Dlna;
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using MediaBrowser.Model.Entities;
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using MediaBrowser.Model.IO;
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using MediaBrowser.Model.Serialization;
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using MediaBrowser.Model.Services;
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using Microsoft.Extensions.Logging;
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using MimeTypes = MediaBrowser.Model.Net.MimeTypes;
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namespace MediaBrowser.Api.Playback.Hls
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{
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/// <summary>
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/// Options is needed for chromecast. Threw Head in there since it's related
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/// </summary>
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[Route("/Videos/{Id}/master.m3u8", "GET", Summary = "Gets a video stream using HTTP live streaming.")]
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[Route("/Videos/{Id}/master.m3u8", "HEAD", Summary = "Gets a video stream using HTTP live streaming.")]
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public class GetMasterHlsVideoPlaylist : VideoStreamRequest, IMasterHlsRequest
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{
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public bool EnableAdaptiveBitrateStreaming { get; set; }
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public GetMasterHlsVideoPlaylist()
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{
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EnableAdaptiveBitrateStreaming = true;
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}
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}
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[Route("/Audio/{Id}/master.m3u8", "GET", Summary = "Gets an audio stream using HTTP live streaming.")]
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[Route("/Audio/{Id}/master.m3u8", "HEAD", Summary = "Gets an audio stream using HTTP live streaming.")]
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public class GetMasterHlsAudioPlaylist : StreamRequest, IMasterHlsRequest
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{
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public bool EnableAdaptiveBitrateStreaming { get; set; }
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public GetMasterHlsAudioPlaylist()
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{
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EnableAdaptiveBitrateStreaming = true;
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}
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}
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public interface IMasterHlsRequest
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{
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bool EnableAdaptiveBitrateStreaming { get; set; }
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}
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[Route("/Videos/{Id}/main.m3u8", "GET", Summary = "Gets a video stream using HTTP live streaming.")]
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public class GetVariantHlsVideoPlaylist : VideoStreamRequest
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{
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}
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[Route("/Audio/{Id}/main.m3u8", "GET", Summary = "Gets an audio stream using HTTP live streaming.")]
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public class GetVariantHlsAudioPlaylist : StreamRequest
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{
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}
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[Route("/Videos/{Id}/hls1/{PlaylistId}/{SegmentId}.{SegmentContainer}", "GET")]
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public class GetHlsVideoSegment : VideoStreamRequest
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{
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public string PlaylistId { get; set; }
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/// <summary>
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/// Gets or sets the segment id.
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/// </summary>
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/// <value>The segment id.</value>
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public string SegmentId { get; set; }
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}
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[Route("/Audio/{Id}/hls1/{PlaylistId}/{SegmentId}.{SegmentContainer}", "GET")]
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public class GetHlsAudioSegment : StreamRequest
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{
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public string PlaylistId { get; set; }
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/// <summary>
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/// Gets or sets the segment id.
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/// </summary>
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/// <value>The segment id.</value>
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public string SegmentId { get; set; }
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}
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[Authenticated]
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public class DynamicHlsService : BaseHlsService
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{
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public DynamicHlsService(
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ILogger logger,
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IServerConfigurationManager serverConfigurationManager,
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IHttpResultFactory httpResultFactory,
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IUserManager userManager,
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ILibraryManager libraryManager,
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IIsoManager isoManager,
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IMediaEncoder mediaEncoder,
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IFileSystem fileSystem,
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IDlnaManager dlnaManager,
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IDeviceManager deviceManager,
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IMediaSourceManager mediaSourceManager,
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IJsonSerializer jsonSerializer,
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IAuthorizationContext authorizationContext,
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INetworkManager networkManager,
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EncodingHelper encodingHelper)
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: base(
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logger,
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serverConfigurationManager,
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httpResultFactory,
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userManager,
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libraryManager,
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isoManager,
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mediaEncoder,
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fileSystem,
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dlnaManager,
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deviceManager,
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mediaSourceManager,
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jsonSerializer,
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authorizationContext,
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encodingHelper)
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{
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NetworkManager = networkManager;
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}
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protected INetworkManager NetworkManager { get; private set; }
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public Task<object> Get(GetMasterHlsVideoPlaylist request)
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{
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return GetMasterPlaylistInternal(request, "GET");
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}
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public Task<object> Head(GetMasterHlsVideoPlaylist request)
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{
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return GetMasterPlaylistInternal(request, "HEAD");
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}
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public Task<object> Get(GetMasterHlsAudioPlaylist request)
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{
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return GetMasterPlaylistInternal(request, "GET");
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}
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public Task<object> Head(GetMasterHlsAudioPlaylist request)
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{
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return GetMasterPlaylistInternal(request, "HEAD");
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}
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public Task<object> Get(GetVariantHlsVideoPlaylist request)
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{
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return GetVariantPlaylistInternal(request, true, "main");
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}
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public Task<object> Get(GetVariantHlsAudioPlaylist request)
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{
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return GetVariantPlaylistInternal(request, false, "main");
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}
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public Task<object> Get(GetHlsVideoSegment request)
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{
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return GetDynamicSegment(request, request.SegmentId);
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}
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public Task<object> Get(GetHlsAudioSegment request)
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{
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return GetDynamicSegment(request, request.SegmentId);
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}
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private async Task<object> GetDynamicSegment(StreamRequest request, string segmentId)
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{
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if ((request.StartTimeTicks ?? 0) > 0)
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{
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throw new ArgumentException("StartTimeTicks is not allowed.");
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}
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var cancellationTokenSource = new CancellationTokenSource();
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var cancellationToken = cancellationTokenSource.Token;
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var requestedIndex = int.Parse(segmentId, NumberStyles.Integer, CultureInfo.InvariantCulture);
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var state = await GetState(request, cancellationToken).ConfigureAwait(false);
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var playlistPath = Path.ChangeExtension(state.OutputFilePath, ".m3u8");
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var segmentPath = GetSegmentPath(state, playlistPath, requestedIndex);
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var segmentExtension = GetSegmentFileExtension(state.Request);
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TranscodingJob job = null;
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if (File.Exists(segmentPath))
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{
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job = ApiEntryPoint.Instance.OnTranscodeBeginRequest(playlistPath, TranscodingJobType);
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Logger.LogDebug("returning {0} [it exists, try 1]", segmentPath);
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return await GetSegmentResult(state, playlistPath, segmentPath, segmentExtension, requestedIndex, job, cancellationToken).ConfigureAwait(false);
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}
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var transcodingLock = ApiEntryPoint.Instance.GetTranscodingLock(playlistPath);
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await transcodingLock.WaitAsync(cancellationTokenSource.Token).ConfigureAwait(false);
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var released = false;
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var startTranscoding = false;
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try
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{
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if (File.Exists(segmentPath))
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{
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job = ApiEntryPoint.Instance.OnTranscodeBeginRequest(playlistPath, TranscodingJobType);
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transcodingLock.Release();
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released = true;
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Logger.LogDebug("returning {0} [it exists, try 2]", segmentPath);
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return await GetSegmentResult(state, playlistPath, segmentPath, segmentExtension, requestedIndex, job, cancellationToken).ConfigureAwait(false);
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}
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else
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{
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var currentTranscodingIndex = GetCurrentTranscodingIndex(playlistPath, segmentExtension);
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var segmentGapRequiringTranscodingChange = 24 / state.SegmentLength;
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if (currentTranscodingIndex == null)
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{
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Logger.LogDebug("Starting transcoding because currentTranscodingIndex=null");
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startTranscoding = true;
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}
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else if (requestedIndex < currentTranscodingIndex.Value)
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{
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Logger.LogDebug("Starting transcoding because requestedIndex={0} and currentTranscodingIndex={1}", requestedIndex, currentTranscodingIndex);
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startTranscoding = true;
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}
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else if (requestedIndex - currentTranscodingIndex.Value > segmentGapRequiringTranscodingChange)
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{
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Logger.LogDebug("Starting transcoding because segmentGap is {0} and max allowed gap is {1}. requestedIndex={2}", requestedIndex - currentTranscodingIndex.Value, segmentGapRequiringTranscodingChange, requestedIndex);
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startTranscoding = true;
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}
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if (startTranscoding)
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{
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// If the playlist doesn't already exist, startup ffmpeg
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try
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{
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await ApiEntryPoint.Instance.KillTranscodingJobs(request.DeviceId, request.PlaySessionId, p => false);
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if (currentTranscodingIndex.HasValue)
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{
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DeleteLastFile(playlistPath, segmentExtension, 0);
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}
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request.StartTimeTicks = GetStartPositionTicks(state, requestedIndex);
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state.WaitForPath = segmentPath;
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job = await StartFfMpeg(state, playlistPath, cancellationTokenSource).ConfigureAwait(false);
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}
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catch
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{
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state.Dispose();
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throw;
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}
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//await WaitForMinimumSegmentCount(playlistPath, 1, cancellationTokenSource.Token).ConfigureAwait(false);
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}
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else
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{
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job = ApiEntryPoint.Instance.OnTranscodeBeginRequest(playlistPath, TranscodingJobType);
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if (job.TranscodingThrottler != null)
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{
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await job.TranscodingThrottler.UnpauseTranscoding();
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}
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}
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}
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}
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finally
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{
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if (!released)
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{
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transcodingLock.Release();
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}
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}
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//Logger.LogInformation("waiting for {0}", segmentPath);
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//while (!File.Exists(segmentPath))
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//{
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// await Task.Delay(50, cancellationToken).ConfigureAwait(false);
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//}
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Logger.LogDebug("returning {0} [general case]", segmentPath);
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job ??= ApiEntryPoint.Instance.OnTranscodeBeginRequest(playlistPath, TranscodingJobType);
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return await GetSegmentResult(state, playlistPath, segmentPath, segmentExtension, requestedIndex, job, cancellationToken).ConfigureAwait(false);
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}
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private const int BufferSize = 81920;
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private long GetStartPositionTicks(StreamState state, int requestedIndex)
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{
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double startSeconds = 0;
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var lengths = GetSegmentLengths(state);
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if (requestedIndex >= lengths.Length)
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{
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var msg = string.Format("Invalid segment index requested: {0} - Segment count: {1}", requestedIndex, lengths.Length);
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throw new ArgumentException(msg);
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}
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for (var i = 0; i < requestedIndex; i++)
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{
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startSeconds += lengths[i];
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}
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var position = TimeSpan.FromSeconds(startSeconds).Ticks;
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return position;
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}
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private long GetEndPositionTicks(StreamState state, int requestedIndex)
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{
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double startSeconds = 0;
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var lengths = GetSegmentLengths(state);
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if (requestedIndex >= lengths.Length)
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{
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var msg = string.Format("Invalid segment index requested: {0} - Segment count: {1}", requestedIndex, lengths.Length);
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throw new ArgumentException(msg);
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}
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for (var i = 0; i <= requestedIndex; i++)
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{
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startSeconds += lengths[i];
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}
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var position = TimeSpan.FromSeconds(startSeconds).Ticks;
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return position;
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}
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private double[] GetSegmentLengths(StreamState state)
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{
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var result = new List<double>();
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var ticks = state.RunTimeTicks ?? 0;
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var segmentLengthTicks = TimeSpan.FromSeconds(state.SegmentLength).Ticks;
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while (ticks > 0)
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{
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var length = ticks >= segmentLengthTicks ? segmentLengthTicks : ticks;
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result.Add(TimeSpan.FromTicks(length).TotalSeconds);
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ticks -= length;
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}
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return result.ToArray();
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}
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public int? GetCurrentTranscodingIndex(string playlist, string segmentExtension)
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{
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var job = ApiEntryPoint.Instance.GetTranscodingJob(playlist, TranscodingJobType);
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if (job == null || job.HasExited)
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{
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return null;
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}
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var file = GetLastTranscodingFile(playlist, segmentExtension, FileSystem);
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if (file == null)
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{
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return null;
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}
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var playlistFilename = Path.GetFileNameWithoutExtension(playlist);
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var indexString = Path.GetFileNameWithoutExtension(file.Name).Substring(playlistFilename.Length);
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return int.Parse(indexString, NumberStyles.Integer, CultureInfo.InvariantCulture);
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}
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private void DeleteLastFile(string playlistPath, string segmentExtension, int retryCount)
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{
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var file = GetLastTranscodingFile(playlistPath, segmentExtension, FileSystem);
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if (file != null)
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{
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DeleteFile(file.FullName, retryCount);
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}
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}
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private void DeleteFile(string path, int retryCount)
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{
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if (retryCount >= 5)
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{
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return;
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}
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Logger.LogDebug("Deleting partial HLS file {path}", path);
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try
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{
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FileSystem.DeleteFile(path);
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}
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catch (IOException ex)
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{
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Logger.LogError(ex, "Error deleting partial stream file(s) {path}", path);
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var task = Task.Delay(100);
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Task.WaitAll(task);
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DeleteFile(path, retryCount + 1);
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}
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catch (Exception ex)
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{
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Logger.LogError(ex, "Error deleting partial stream file(s) {path}", path);
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}
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}
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private static FileSystemMetadata GetLastTranscodingFile(string playlist, string segmentExtension, IFileSystem fileSystem)
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{
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var folder = Path.GetDirectoryName(playlist);
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var filePrefix = Path.GetFileNameWithoutExtension(playlist) ?? string.Empty;
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try
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{
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return fileSystem.GetFiles(folder, new[] { segmentExtension }, true, false)
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.Where(i => Path.GetFileNameWithoutExtension(i.Name).StartsWith(filePrefix, StringComparison.OrdinalIgnoreCase))
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.OrderByDescending(fileSystem.GetLastWriteTimeUtc)
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.FirstOrDefault();
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}
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catch (IOException)
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{
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return null;
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}
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}
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protected override int GetStartNumber(StreamState state)
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{
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return GetStartNumber(state.VideoRequest);
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}
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private int GetStartNumber(VideoStreamRequest request)
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{
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var segmentId = "0";
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if (request is GetHlsVideoSegment segmentRequest)
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{
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segmentId = segmentRequest.SegmentId;
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}
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return int.Parse(segmentId, NumberStyles.Integer, CultureInfo.InvariantCulture);
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}
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private string GetSegmentPath(StreamState state, string playlist, int index)
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{
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var folder = Path.GetDirectoryName(playlist);
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var filename = Path.GetFileNameWithoutExtension(playlist);
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return Path.Combine(folder, filename + index.ToString(CultureInfo.InvariantCulture) + GetSegmentFileExtension(state.Request));
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}
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private async Task<object> GetSegmentResult(StreamState state,
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string playlistPath,
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string segmentPath,
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string segmentExtension,
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int segmentIndex,
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TranscodingJob transcodingJob,
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CancellationToken cancellationToken)
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{
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var segmentExists = File.Exists(segmentPath);
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if (segmentExists)
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{
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if (transcodingJob != null && transcodingJob.HasExited)
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{
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// Transcoding job is over, so assume all existing files are ready
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Logger.LogDebug("serving up {0} as transcode is over", segmentPath);
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return await GetSegmentResult(state, segmentPath, segmentIndex, transcodingJob).ConfigureAwait(false);
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}
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var currentTranscodingIndex = GetCurrentTranscodingIndex(playlistPath, segmentExtension);
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// If requested segment is less than transcoding position, we can't transcode backwards, so assume it's ready
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if (segmentIndex < currentTranscodingIndex)
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{
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Logger.LogDebug("serving up {0} as transcode index {1} is past requested point {2}", segmentPath, currentTranscodingIndex, segmentIndex);
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return await GetSegmentResult(state, segmentPath, segmentIndex, transcodingJob).ConfigureAwait(false);
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}
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}
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var nextSegmentPath = GetSegmentPath(state, playlistPath, segmentIndex + 1);
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if (transcodingJob != null)
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{
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while (!cancellationToken.IsCancellationRequested && !transcodingJob.HasExited)
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{
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// To be considered ready, the segment file has to exist AND
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// either the transcoding job should be done or next segment should also exist
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if (segmentExists)
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{
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if (transcodingJob.HasExited || File.Exists(nextSegmentPath))
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{
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Logger.LogDebug("serving up {0} as it deemed ready", segmentPath);
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return await GetSegmentResult(state, segmentPath, segmentIndex, transcodingJob).ConfigureAwait(false);
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}
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}
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else
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{
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segmentExists = File.Exists(segmentPath);
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if (segmentExists)
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{
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continue; // avoid unnecessary waiting if segment just became available
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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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if (!File.Exists(segmentPath))
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{
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Logger.LogWarning("cannot serve {0} as transcoding quit before we got there", segmentPath);
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}
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else
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{
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Logger.LogDebug("serving {0} as it's on disk and transcoding stopped", segmentPath);
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}
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cancellationToken.ThrowIfCancellationRequested();
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}
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else
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{
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Logger.LogWarning("cannot serve {0} as it doesn't exist and no transcode is running", segmentPath);
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}
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return await GetSegmentResult(state, segmentPath, segmentIndex, transcodingJob).ConfigureAwait(false);
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}
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private Task<object> GetSegmentResult(StreamState state, string segmentPath, int index, TranscodingJob transcodingJob)
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{
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var segmentEndingPositionTicks = GetEndPositionTicks(state, index);
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return ResultFactory.GetStaticFileResult(Request, new StaticFileResultOptions
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{
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Path = segmentPath,
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FileShare = FileShare.ReadWrite,
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OnComplete = () =>
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{
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Logger.LogDebug("finished serving {0}", segmentPath);
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if (transcodingJob != null)
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{
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transcodingJob.DownloadPositionTicks = Math.Max(transcodingJob.DownloadPositionTicks ?? segmentEndingPositionTicks, segmentEndingPositionTicks);
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ApiEntryPoint.Instance.OnTranscodeEndRequest(transcodingJob);
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}
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}
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});
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}
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|
|
private async Task<object> GetMasterPlaylistInternal(StreamRequest request, string method)
|
|
{
|
|
var state = await GetState(request, CancellationToken.None).ConfigureAwait(false);
|
|
|
|
if (string.IsNullOrEmpty(request.MediaSourceId))
|
|
{
|
|
throw new ArgumentException("MediaSourceId is required");
|
|
}
|
|
|
|
var playlistText = string.Empty;
|
|
|
|
if (string.Equals(method, "GET", StringComparison.OrdinalIgnoreCase))
|
|
{
|
|
var audioBitrate = state.OutputAudioBitrate ?? 0;
|
|
var videoBitrate = state.OutputVideoBitrate ?? 0;
|
|
|
|
playlistText = GetMasterPlaylistFileText(state, videoBitrate + audioBitrate);
|
|
}
|
|
|
|
return ResultFactory.GetResult(playlistText, MimeTypes.GetMimeType("playlist.m3u8"), new Dictionary<string, string>());
|
|
}
|
|
|
|
private string GetMasterPlaylistFileText(StreamState state, int totalBitrate)
|
|
{
|
|
var builder = new StringBuilder();
|
|
|
|
builder.AppendLine("#EXTM3U");
|
|
|
|
var isLiveStream = state.IsSegmentedLiveStream;
|
|
|
|
var queryStringIndex = Request.RawUrl.IndexOf('?');
|
|
var queryString = queryStringIndex == -1 ? string.Empty : Request.RawUrl.Substring(queryStringIndex);
|
|
|
|
// from universal audio service
|
|
if (queryString.IndexOf("SegmentContainer", StringComparison.OrdinalIgnoreCase) == -1 && !string.IsNullOrWhiteSpace(state.Request.SegmentContainer))
|
|
{
|
|
queryString += "&SegmentContainer=" + state.Request.SegmentContainer;
|
|
}
|
|
// from universal audio service
|
|
if (!string.IsNullOrWhiteSpace(state.Request.TranscodeReasons) && queryString.IndexOf("TranscodeReasons=", StringComparison.OrdinalIgnoreCase) == -1)
|
|
{
|
|
queryString += "&TranscodeReasons=" + state.Request.TranscodeReasons;
|
|
}
|
|
|
|
// Main stream
|
|
var playlistUrl = isLiveStream ? "live.m3u8" : "main.m3u8";
|
|
|
|
playlistUrl += queryString;
|
|
|
|
var request = state.Request;
|
|
|
|
var subtitleStreams = state.MediaSource
|
|
.MediaStreams
|
|
.Where(i => i.IsTextSubtitleStream)
|
|
.ToList();
|
|
|
|
var subtitleGroup = subtitleStreams.Count > 0 &&
|
|
request is GetMasterHlsVideoPlaylist &&
|
|
(state.SubtitleDeliveryMethod == SubtitleDeliveryMethod.Hls || state.VideoRequest.EnableSubtitlesInManifest) ?
|
|
"subs" :
|
|
null;
|
|
|
|
// If we're burning in subtitles then don't add additional subs to the manifest
|
|
if (state.SubtitleStream != null && state.SubtitleDeliveryMethod == SubtitleDeliveryMethod.Encode)
|
|
{
|
|
subtitleGroup = null;
|
|
}
|
|
|
|
if (!string.IsNullOrWhiteSpace(subtitleGroup))
|
|
{
|
|
AddSubtitles(state, subtitleStreams, builder);
|
|
}
|
|
|
|
AppendPlaylist(builder, state, playlistUrl, totalBitrate, subtitleGroup);
|
|
|
|
if (EnableAdaptiveBitrateStreaming(state, isLiveStream))
|
|
{
|
|
var requestedVideoBitrate = state.VideoRequest == null ? 0 : state.VideoRequest.VideoBitRate ?? 0;
|
|
|
|
// By default, vary by just 200k
|
|
var variation = GetBitrateVariation(totalBitrate);
|
|
|
|
var newBitrate = totalBitrate - variation;
|
|
var variantUrl = ReplaceBitrate(playlistUrl, requestedVideoBitrate, requestedVideoBitrate - variation);
|
|
AppendPlaylist(builder, state, variantUrl, newBitrate, subtitleGroup);
|
|
|
|
variation *= 2;
|
|
newBitrate = totalBitrate - variation;
|
|
variantUrl = ReplaceBitrate(playlistUrl, requestedVideoBitrate, requestedVideoBitrate - variation);
|
|
AppendPlaylist(builder, state, variantUrl, newBitrate, subtitleGroup);
|
|
}
|
|
|
|
return builder.ToString();
|
|
}
|
|
|
|
private string ReplaceBitrate(string url, int oldValue, int newValue)
|
|
{
|
|
return url.Replace(
|
|
"videobitrate=" + oldValue.ToString(CultureInfo.InvariantCulture),
|
|
"videobitrate=" + newValue.ToString(CultureInfo.InvariantCulture),
|
|
StringComparison.OrdinalIgnoreCase);
|
|
}
|
|
|
|
private void AddSubtitles(StreamState state, IEnumerable<MediaStream> subtitles, StringBuilder builder)
|
|
{
|
|
var selectedIndex = state.SubtitleStream == null || state.SubtitleDeliveryMethod != SubtitleDeliveryMethod.Hls ? (int?)null : state.SubtitleStream.Index;
|
|
|
|
foreach (var stream in subtitles)
|
|
{
|
|
const string format = "#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID=\"subs\",NAME=\"{0}\",DEFAULT={1},FORCED={2},AUTOSELECT=YES,URI=\"{3}\",LANGUAGE=\"{4}\"";
|
|
|
|
var name = stream.DisplayTitle;
|
|
|
|
var isDefault = selectedIndex.HasValue && selectedIndex.Value == stream.Index;
|
|
var isForced = stream.IsForced;
|
|
|
|
var url = string.Format("{0}/Subtitles/{1}/subtitles.m3u8?SegmentLength={2}&api_key={3}",
|
|
state.Request.MediaSourceId,
|
|
stream.Index.ToString(CultureInfo.InvariantCulture),
|
|
30.ToString(CultureInfo.InvariantCulture),
|
|
AuthorizationContext.GetAuthorizationInfo(Request).Token);
|
|
|
|
var line = string.Format(format,
|
|
name,
|
|
isDefault ? "YES" : "NO",
|
|
isForced ? "YES" : "NO",
|
|
url,
|
|
stream.Language ?? "Unknown");
|
|
|
|
builder.AppendLine(line);
|
|
}
|
|
}
|
|
|
|
private bool EnableAdaptiveBitrateStreaming(StreamState state, bool isLiveStream)
|
|
{
|
|
// Within the local network this will likely do more harm than good.
|
|
if (Request.IsLocal || NetworkManager.IsInLocalNetwork(Request.RemoteIp))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
if (state.Request is IMasterHlsRequest request && !request.EnableAdaptiveBitrateStreaming)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
if (isLiveStream || string.IsNullOrWhiteSpace(state.MediaPath))
|
|
{
|
|
// Opening live streams is so slow it's not even worth it
|
|
return false;
|
|
}
|
|
|
|
if (string.Equals(state.OutputVideoCodec, "copy", StringComparison.OrdinalIgnoreCase))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
if (string.Equals(state.OutputAudioCodec, "copy", StringComparison.OrdinalIgnoreCase))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
if (!state.IsOutputVideo)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
// Having problems in android
|
|
return false;
|
|
//return state.VideoRequest.VideoBitRate.HasValue;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Get the H.26X level of the output video stream.
|
|
/// </summary>
|
|
/// <param name="state">StreamState of the current stream.</param>
|
|
/// <returns>H.26X level of the output video stream.</returns>
|
|
private int? GetOutputVideoCodecLevel(StreamState state)
|
|
{
|
|
string levelString;
|
|
if (string.Equals(state.OutputVideoCodec, "copy", StringComparison.OrdinalIgnoreCase)
|
|
&& state.VideoStream.Level.HasValue)
|
|
{
|
|
levelString = state.VideoStream?.Level.ToString();
|
|
}
|
|
else
|
|
{
|
|
levelString = state.GetRequestedLevel(state.ActualOutputVideoCodec);
|
|
}
|
|
|
|
if (int.TryParse(levelString, NumberStyles.Integer, CultureInfo.InvariantCulture, out var parsedLevel))
|
|
{
|
|
return parsedLevel;
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets a formatted string of the output audio codec, for use in the CODECS field.
|
|
/// </summary>
|
|
/// <seealso cref="AppendPlaylistCodecsField(StringBuilder, StreamState)"/>
|
|
/// <seealso cref="GetPlaylistVideoCodecs(StreamState, string, int)"/>
|
|
/// <param name="state">StreamState of the current stream.</param>
|
|
/// <returns>Formatted audio codec string.</returns>
|
|
private string GetPlaylistAudioCodecs(StreamState state)
|
|
{
|
|
|
|
if (string.Equals(state.ActualOutputAudioCodec, "aac", StringComparison.OrdinalIgnoreCase))
|
|
{
|
|
string profile = state.GetRequestedProfiles("aac").FirstOrDefault();
|
|
|
|
return HlsCodecStringFactory.GetAACString(profile);
|
|
}
|
|
else if (string.Equals(state.ActualOutputAudioCodec, "mp3", StringComparison.OrdinalIgnoreCase))
|
|
{
|
|
return HlsCodecStringFactory.GetMP3String();
|
|
}
|
|
else if (string.Equals(state.ActualOutputAudioCodec, "ac3", StringComparison.OrdinalIgnoreCase))
|
|
{
|
|
return HlsCodecStringFactory.GetAC3String();
|
|
}
|
|
else if (string.Equals(state.ActualOutputAudioCodec, "eac3", StringComparison.OrdinalIgnoreCase))
|
|
{
|
|
return HlsCodecStringFactory.GetEAC3String();
|
|
}
|
|
|
|
return string.Empty;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets a formatted string of the output video codec, for use in the CODECS field.
|
|
/// </summary>
|
|
/// <seealso cref="AppendPlaylistCodecsField(StringBuilder, StreamState)"/>
|
|
/// <seealso cref="GetPlaylistAudioCodecs(StreamState)"/>
|
|
/// <param name="state">StreamState of the current stream.</param>
|
|
/// <returns>Formatted video codec string.</returns>
|
|
private string GetPlaylistVideoCodecs(StreamState state, string codec, int level)
|
|
{
|
|
if (level == 0)
|
|
{
|
|
// This is 0 when there's no requested H.26X level in the device profile
|
|
// and the source is not encoded in H.26X
|
|
Logger.LogError("Got invalid H.26X level when building CODECS field for HLS master playlist");
|
|
return string.Empty;
|
|
}
|
|
|
|
if (string.Equals(codec, "h264", StringComparison.OrdinalIgnoreCase))
|
|
{
|
|
string profile = state.GetRequestedProfiles("h264").FirstOrDefault();
|
|
|
|
return HlsCodecStringFactory.GetH264String(profile, level);
|
|
}
|
|
else if (string.Equals(codec, "h265", StringComparison.OrdinalIgnoreCase)
|
|
|| string.Equals(codec, "hevc", StringComparison.OrdinalIgnoreCase))
|
|
{
|
|
string profile = state.GetRequestedProfiles("h265").FirstOrDefault();
|
|
|
|
return HlsCodecStringFactory.GetH265String(profile, level);
|
|
}
|
|
|
|
return string.Empty;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Appends a CODECS field containing formatted strings of
|
|
/// the active streams output video and audio codecs.
|
|
/// </summary>
|
|
/// <seealso cref="AppendPlaylist(StringBuilder, StreamState, string, int, string)"/>
|
|
/// <seealso cref="GetPlaylistVideoCodecs(StreamState, string, int)"/>
|
|
/// <seealso cref="GetPlaylistAudioCodecs(StreamState)"/>
|
|
/// <param name="builder">StringBuilder to append the field to.</param>
|
|
/// <param name="state">StreamState of the current stream.</param>
|
|
private void AppendPlaylistCodecsField(StringBuilder builder, StreamState state)
|
|
{
|
|
// Video
|
|
string videoCodecs = string.Empty;
|
|
int? videoCodecLevel = GetOutputVideoCodecLevel(state);
|
|
if (!string.IsNullOrEmpty(state.ActualOutputVideoCodec) && videoCodecLevel.HasValue)
|
|
{
|
|
videoCodecs = GetPlaylistVideoCodecs(state, state.ActualOutputVideoCodec, videoCodecLevel.Value);
|
|
}
|
|
|
|
// Audio
|
|
string audioCodecs = string.Empty;
|
|
if (!string.IsNullOrEmpty(state.ActualOutputAudioCodec))
|
|
{
|
|
audioCodecs = GetPlaylistAudioCodecs(state);
|
|
}
|
|
|
|
StringBuilder codecs = new StringBuilder();
|
|
|
|
codecs.Append(videoCodecs)
|
|
.Append(',')
|
|
.Append(audioCodecs);
|
|
|
|
if (codecs.Length > 1)
|
|
{
|
|
builder.Append(",CODECS=\"")
|
|
.Append(codecs)
|
|
.Append('"');
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Appends a FRAME-RATE field containing the framerate of the output stream.
|
|
/// </summary>
|
|
/// <seealso cref="AppendPlaylist(StringBuilder, StreamState, string, int, string)"/>
|
|
/// <param name="builder">StringBuilder to append the field to.</param>
|
|
/// <param name="state">StreamState of the current stream.</param>
|
|
private void AppendPlaylistFramerateField(StringBuilder builder, StreamState state)
|
|
{
|
|
double? framerate = null;
|
|
if (state.TargetFramerate.HasValue)
|
|
{
|
|
framerate = Math.Round(state.TargetFramerate.GetValueOrDefault(), 3);
|
|
}
|
|
else if (state.VideoStream.RealFrameRate.HasValue)
|
|
{
|
|
framerate = Math.Round(state.VideoStream.RealFrameRate.GetValueOrDefault(), 3);
|
|
}
|
|
|
|
if (framerate.HasValue)
|
|
{
|
|
builder.Append(",FRAME-RATE=\"")
|
|
.Append(framerate.Value)
|
|
.Append('"');
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Appends a RESOLUTION field containing the resolution of the output stream.
|
|
/// </summary>
|
|
/// <seealso cref="AppendPlaylist(StringBuilder, StreamState, string, int, string)"/>
|
|
/// <param name="builder">StringBuilder to append the field to.</param>
|
|
/// <param name="state">StreamState of the current stream.</param>
|
|
private void AppendPlaylistResolutionField(StringBuilder builder, StreamState state)
|
|
{
|
|
if (state.OutputWidth.HasValue && state.OutputHeight.HasValue)
|
|
{
|
|
builder.Append(",RESOLUTION=\"")
|
|
.Append(state.OutputWidth.GetValueOrDefault())
|
|
.Append('x')
|
|
.Append(state.OutputHeight.GetValueOrDefault())
|
|
.Append('"');
|
|
}
|
|
}
|
|
|
|
private void AppendPlaylist(StringBuilder builder, StreamState state, string url, int bitrate, string subtitleGroup)
|
|
{
|
|
builder.Append("#EXT-X-STREAM-INF:BANDWIDTH=")
|
|
.Append(bitrate.ToString(CultureInfo.InvariantCulture))
|
|
.Append(",AVERAGE-BANDWIDTH=")
|
|
.Append(bitrate.ToString(CultureInfo.InvariantCulture));
|
|
|
|
AppendPlaylistCodecsField(builder, state);
|
|
|
|
AppendPlaylistResolutionField(builder, state);
|
|
|
|
AppendPlaylistFramerateField(builder, state);
|
|
|
|
if (!string.IsNullOrWhiteSpace(subtitleGroup))
|
|
{
|
|
builder.Append(",SUBTITLES=\"")
|
|
.Append(subtitleGroup)
|
|
.Append('"');
|
|
}
|
|
|
|
builder.Append(Environment.NewLine);
|
|
builder.AppendLine(url);
|
|
}
|
|
|
|
private int GetBitrateVariation(int bitrate)
|
|
{
|
|
// By default, vary by just 50k
|
|
var variation = 50000;
|
|
|
|
if (bitrate >= 10000000)
|
|
{
|
|
variation = 2000000;
|
|
}
|
|
else if (bitrate >= 5000000)
|
|
{
|
|
variation = 1500000;
|
|
}
|
|
else if (bitrate >= 3000000)
|
|
{
|
|
variation = 1000000;
|
|
}
|
|
else if (bitrate >= 2000000)
|
|
{
|
|
variation = 500000;
|
|
}
|
|
else if (bitrate >= 1000000)
|
|
{
|
|
variation = 300000;
|
|
}
|
|
else if (bitrate >= 600000)
|
|
{
|
|
variation = 200000;
|
|
}
|
|
else if (bitrate >= 400000)
|
|
{
|
|
variation = 100000;
|
|
}
|
|
|
|
return variation;
|
|
}
|
|
|
|
private async Task<object> GetVariantPlaylistInternal(StreamRequest request, bool isOutputVideo, string name)
|
|
{
|
|
var state = await GetState(request, CancellationToken.None).ConfigureAwait(false);
|
|
|
|
var segmentLengths = GetSegmentLengths(state);
|
|
|
|
var builder = new StringBuilder();
|
|
|
|
builder.AppendLine("#EXTM3U");
|
|
builder.AppendLine("#EXT-X-PLAYLIST-TYPE:VOD");
|
|
builder.AppendLine("#EXT-X-VERSION:3");
|
|
builder.AppendLine("#EXT-X-TARGETDURATION:" + Math.Ceiling(segmentLengths.Length > 0 ? segmentLengths.Max() : state.SegmentLength).ToString(CultureInfo.InvariantCulture));
|
|
builder.AppendLine("#EXT-X-MEDIA-SEQUENCE:0");
|
|
|
|
var queryStringIndex = Request.RawUrl.IndexOf('?');
|
|
var queryString = queryStringIndex == -1 ? string.Empty : Request.RawUrl.Substring(queryStringIndex);
|
|
|
|
//if ((Request.UserAgent ?? string.Empty).IndexOf("roku", StringComparison.OrdinalIgnoreCase) != -1)
|
|
//{
|
|
// queryString = string.Empty;
|
|
//}
|
|
|
|
var index = 0;
|
|
|
|
foreach (var length in segmentLengths)
|
|
{
|
|
builder.AppendLine("#EXTINF:" + length.ToString("0.0000", CultureInfo.InvariantCulture) + ", nodesc");
|
|
|
|
builder.AppendLine(string.Format("hls1/{0}/{1}{2}{3}",
|
|
|
|
name,
|
|
index.ToString(CultureInfo.InvariantCulture),
|
|
GetSegmentFileExtension(request),
|
|
queryString));
|
|
|
|
index++;
|
|
}
|
|
|
|
builder.AppendLine("#EXT-X-ENDLIST");
|
|
|
|
var playlistText = builder.ToString();
|
|
|
|
return ResultFactory.GetResult(playlistText, MimeTypes.GetMimeType("playlist.m3u8"), new Dictionary<string, string>());
|
|
}
|
|
|
|
protected override string GetAudioArguments(StreamState state, EncodingOptions encodingOptions)
|
|
{
|
|
var audioCodec = EncodingHelper.GetAudioEncoder(state);
|
|
|
|
if (!state.IsOutputVideo)
|
|
{
|
|
if (string.Equals(audioCodec, "copy", StringComparison.OrdinalIgnoreCase))
|
|
{
|
|
return "-acodec copy";
|
|
}
|
|
|
|
var audioTranscodeParams = new List<string>();
|
|
|
|
audioTranscodeParams.Add("-acodec " + audioCodec);
|
|
|
|
if (state.OutputAudioBitrate.HasValue)
|
|
{
|
|
audioTranscodeParams.Add("-ab " + state.OutputAudioBitrate.Value.ToString(CultureInfo.InvariantCulture));
|
|
}
|
|
|
|
if (state.OutputAudioChannels.HasValue)
|
|
{
|
|
audioTranscodeParams.Add("-ac " + state.OutputAudioChannels.Value.ToString(CultureInfo.InvariantCulture));
|
|
}
|
|
|
|
if (state.OutputAudioSampleRate.HasValue)
|
|
{
|
|
audioTranscodeParams.Add("-ar " + state.OutputAudioSampleRate.Value.ToString(CultureInfo.InvariantCulture));
|
|
}
|
|
|
|
audioTranscodeParams.Add("-vn");
|
|
return string.Join(" ", audioTranscodeParams.ToArray());
|
|
}
|
|
|
|
if (string.Equals(audioCodec, "copy", StringComparison.OrdinalIgnoreCase))
|
|
{
|
|
var videoCodec = EncodingHelper.GetVideoEncoder(state, encodingOptions);
|
|
|
|
if (string.Equals(videoCodec, "copy", StringComparison.OrdinalIgnoreCase) && state.EnableBreakOnNonKeyFrames(videoCodec))
|
|
{
|
|
return "-codec:a:0 copy -copypriorss:a:0 0";
|
|
}
|
|
|
|
return "-codec:a:0 copy";
|
|
}
|
|
|
|
var args = "-codec:a:0 " + audioCodec;
|
|
|
|
var channels = state.OutputAudioChannels;
|
|
|
|
if (channels.HasValue)
|
|
{
|
|
args += " -ac " + channels.Value;
|
|
}
|
|
|
|
var bitrate = state.OutputAudioBitrate;
|
|
|
|
if (bitrate.HasValue)
|
|
{
|
|
args += " -ab " + bitrate.Value.ToString(CultureInfo.InvariantCulture);
|
|
}
|
|
|
|
if (state.OutputAudioSampleRate.HasValue)
|
|
{
|
|
args += " -ar " + state.OutputAudioSampleRate.Value.ToString(CultureInfo.InvariantCulture);
|
|
}
|
|
|
|
args += " " + EncodingHelper.GetAudioFilterParam(state, encodingOptions, true);
|
|
|
|
return args;
|
|
}
|
|
|
|
protected override string GetVideoArguments(StreamState state, EncodingOptions encodingOptions)
|
|
{
|
|
if (!state.IsOutputVideo)
|
|
{
|
|
return string.Empty;
|
|
}
|
|
|
|
var codec = EncodingHelper.GetVideoEncoder(state, encodingOptions);
|
|
|
|
var args = "-codec:v:0 " + codec;
|
|
|
|
// if (state.EnableMpegtsM2TsMode)
|
|
// {
|
|
// args += " -mpegts_m2ts_mode 1";
|
|
// }
|
|
|
|
// See if we can save come cpu cycles by avoiding encoding
|
|
if (string.Equals(codec, "copy", StringComparison.OrdinalIgnoreCase))
|
|
{
|
|
if (state.VideoStream != null && !string.Equals(state.VideoStream.NalLengthSize, "0", StringComparison.OrdinalIgnoreCase))
|
|
{
|
|
string bitStreamArgs = EncodingHelper.GetBitStreamArgs(state.VideoStream);
|
|
if (!string.IsNullOrEmpty(bitStreamArgs))
|
|
{
|
|
args += " " + bitStreamArgs;
|
|
}
|
|
}
|
|
|
|
//args += " -flags -global_header";
|
|
}
|
|
else
|
|
{
|
|
var gopArg = string.Empty;
|
|
var keyFrameArg = string.Format(
|
|
CultureInfo.InvariantCulture,
|
|
" -force_key_frames:0 \"expr:gte(t,{0}+n_forced*{1})\"",
|
|
GetStartNumber(state) * state.SegmentLength,
|
|
state.SegmentLength);
|
|
|
|
var framerate = state.VideoStream?.RealFrameRate;
|
|
|
|
if (framerate.HasValue)
|
|
{
|
|
// This is to make sure keyframe interval is limited to our segment,
|
|
// as forcing keyframes is not enough.
|
|
// Example: we encoded half of desired length, then codec detected
|
|
// scene cut and inserted a keyframe; next forced keyframe would
|
|
// be created outside of segment, which breaks seeking
|
|
// -sc_threshold 0 is used to prevent the hardware encoder from post processing to break the set keyframe
|
|
gopArg = string.Format(
|
|
CultureInfo.InvariantCulture,
|
|
" -g {0} -keyint_min {0} -sc_threshold 0",
|
|
Math.Ceiling(state.SegmentLength * framerate.Value)
|
|
);
|
|
}
|
|
|
|
args += " " + EncodingHelper.GetVideoQualityParam(state, codec, encodingOptions, GetDefaultEncoderPreset());
|
|
|
|
// Unable to force key frames using these hw encoders, set key frames by GOP
|
|
if (string.Equals(codec, "h264_qsv", StringComparison.OrdinalIgnoreCase)
|
|
|| string.Equals(codec, "h264_nvenc", StringComparison.OrdinalIgnoreCase)
|
|
|| string.Equals(codec, "h264_amf", StringComparison.OrdinalIgnoreCase))
|
|
{
|
|
args += " " + gopArg;
|
|
}
|
|
else
|
|
{
|
|
args += " " + keyFrameArg + gopArg;
|
|
}
|
|
|
|
//args += " -mixed-refs 0 -refs 3 -x264opts b_pyramid=0:weightb=0:weightp=0";
|
|
|
|
var hasGraphicalSubs = state.SubtitleStream != null && !state.SubtitleStream.IsTextSubtitleStream && state.SubtitleDeliveryMethod == SubtitleDeliveryMethod.Encode;
|
|
|
|
// This is for graphical subs
|
|
if (hasGraphicalSubs)
|
|
{
|
|
args += EncodingHelper.GetGraphicalSubtitleParam(state, encodingOptions, codec);
|
|
}
|
|
// Add resolution params, if specified
|
|
else
|
|
{
|
|
args += EncodingHelper.GetOutputSizeParam(state, encodingOptions, codec);
|
|
}
|
|
|
|
// -start_at_zero is necessary to use with -ss when seeking,
|
|
// otherwise the target position cannot be determined.
|
|
if (!(state.SubtitleStream != null && state.SubtitleStream.IsExternal && !state.SubtitleStream.IsTextSubtitleStream))
|
|
{
|
|
args += " -start_at_zero";
|
|
}
|
|
|
|
//args += " -flags -global_header";
|
|
}
|
|
|
|
if (!string.IsNullOrEmpty(state.OutputVideoSync))
|
|
{
|
|
args += " -vsync " + state.OutputVideoSync;
|
|
}
|
|
|
|
args += EncodingHelper.GetOutputFFlags(state);
|
|
|
|
return args;
|
|
}
|
|
|
|
protected override string GetCommandLineArguments(string outputPath, EncodingOptions encodingOptions, StreamState state, bool isEncoding)
|
|
{
|
|
var videoCodec = EncodingHelper.GetVideoEncoder(state, encodingOptions);
|
|
|
|
var threads = EncodingHelper.GetNumberOfThreads(state, encodingOptions, videoCodec);
|
|
|
|
if (state.BaseRequest.BreakOnNonKeyFrames)
|
|
{
|
|
// FIXME: this is actually a workaround, as ideally it really should be the client which decides whether non-keyframe
|
|
// breakpoints are supported; but current implementation always uses "ffmpeg input seeking" which is liable
|
|
// to produce a missing part of video stream before first keyframe is encountered, which may lead to
|
|
// awkward cases like a few starting HLS segments having no video whatsoever, which breaks hls.js
|
|
Logger.LogInformation("Current HLS implementation doesn't support non-keyframe breaks but one is requested, ignoring that request");
|
|
state.BaseRequest.BreakOnNonKeyFrames = false;
|
|
}
|
|
|
|
var inputModifier = EncodingHelper.GetInputModifier(state, encodingOptions);
|
|
|
|
// If isEncoding is true we're actually starting ffmpeg
|
|
var startNumber = GetStartNumber(state);
|
|
var startNumberParam = isEncoding ? startNumber.ToString(CultureInfo.InvariantCulture) : "0";
|
|
|
|
var mapArgs = state.IsOutputVideo ? EncodingHelper.GetMapArgs(state) : string.Empty;
|
|
|
|
var outputTsArg = Path.Combine(Path.GetDirectoryName(outputPath), Path.GetFileNameWithoutExtension(outputPath)) + "%d" + GetSegmentFileExtension(state.Request);
|
|
|
|
var segmentFormat = GetSegmentFileExtension(state.Request).TrimStart('.');
|
|
if (string.Equals(segmentFormat, "ts", StringComparison.OrdinalIgnoreCase))
|
|
{
|
|
segmentFormat = "mpegts";
|
|
}
|
|
|
|
return string.Format(
|
|
"{0} {1} -map_metadata -1 -map_chapters -1 -threads {2} {3} {4} {5} -copyts -avoid_negative_ts disabled -f hls -max_delay 5000000 -hls_time {6} -individual_header_trailer 0 -hls_segment_type {7} -start_number {8} -hls_segment_filename \"{9}\" -hls_playlist_type vod -hls_list_size 0 -y \"{10}\"",
|
|
inputModifier,
|
|
EncodingHelper.GetInputArgument(state, encodingOptions),
|
|
threads,
|
|
mapArgs,
|
|
GetVideoArguments(state, encodingOptions),
|
|
GetAudioArguments(state, encodingOptions),
|
|
state.SegmentLength.ToString(CultureInfo.InvariantCulture),
|
|
segmentFormat,
|
|
startNumberParam,
|
|
outputTsArg,
|
|
outputPath
|
|
).Trim();
|
|
}
|
|
}
|
|
}
|