jellyfin-server/MediaBrowser.Api/Playback/Hls/MpegDashService.cs
2014-11-17 21:48:22 -05:00

666 lines
24 KiB
C#

using MediaBrowser.Common.IO;
using MediaBrowser.Common.Net;
using MediaBrowser.Controller.Channels;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Dlna;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.LiveTv;
using MediaBrowser.Controller.MediaEncoding;
using MediaBrowser.Controller.Net;
using MediaBrowser.Model.IO;
using ServiceStack;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Security;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace MediaBrowser.Api.Playback.Hls
{
/// <summary>
/// Options is needed for chromecast. Threw Head in there since it's related
/// </summary>
[Route("/Videos/{Id}/master.mpd", "GET", Summary = "Gets a video stream using Mpeg dash.")]
[Route("/Videos/{Id}/master.mpd", "HEAD", Summary = "Gets a video stream using Mpeg dash.")]
public class GetMasterManifest : VideoStreamRequest
{
public bool EnableAdaptiveBitrateStreaming { get; set; }
public GetMasterManifest()
{
EnableAdaptiveBitrateStreaming = true;
}
}
[Route("/Videos/{Id}/dash/{SegmentId}.ts", "GET")]
[Route("/Videos/{Id}/dash/{SegmentId}.mp4", "GET")]
public class GetDashSegment : VideoStreamRequest
{
/// <summary>
/// Gets or sets the segment id.
/// </summary>
/// <value>The segment id.</value>
public string SegmentId { get; set; }
}
public class MpegDashService : BaseHlsService
{
protected INetworkManager NetworkManager { get; private set; }
public MpegDashService(IServerConfigurationManager serverConfig, IUserManager userManager, ILibraryManager libraryManager, IIsoManager isoManager, IMediaEncoder mediaEncoder, IFileSystem fileSystem, ILiveTvManager liveTvManager, IDlnaManager dlnaManager, IChannelManager channelManager, ISubtitleEncoder subtitleEncoder, INetworkManager networkManager)
: base(serverConfig, userManager, libraryManager, isoManager, mediaEncoder, fileSystem, liveTvManager, dlnaManager, channelManager, subtitleEncoder)
{
NetworkManager = networkManager;
}
public object Get(GetMasterManifest request)
{
var result = GetAsync(request, "GET").Result;
return result;
}
public object Head(GetMasterManifest request)
{
var result = GetAsync(request, "HEAD").Result;
return result;
}
private async Task<object> GetAsync(GetMasterManifest request, string method)
{
if (string.Equals(request.AudioCodec, "copy", StringComparison.OrdinalIgnoreCase))
{
throw new ArgumentException("Audio codec copy is not allowed here.");
}
if (string.Equals(request.VideoCodec, "copy", StringComparison.OrdinalIgnoreCase))
{
throw new ArgumentException("Video codec copy is not allowed here.");
}
if (string.IsNullOrEmpty(request.MediaSourceId))
{
throw new ArgumentException("MediaSourceId is required");
}
var state = await GetState(request, CancellationToken.None).ConfigureAwait(false);
var playlistText = string.Empty;
if (string.Equals(method, "GET", StringComparison.OrdinalIgnoreCase))
{
playlistText = GetManifestText(state);
}
return ResultFactory.GetResult(playlistText, Common.Net.MimeTypes.GetMimeType("playlist.mpd"), new Dictionary<string, string>());
}
private string GetManifestText(StreamState state)
{
var builder = new StringBuilder();
var time = TimeSpan.FromTicks(state.RunTimeTicks.Value);
var duration = "PT" + time.Hours.ToString("00", UsCulture) + "H" + time.Minutes.ToString("00", UsCulture) + "M" + time.Seconds.ToString("00", UsCulture) + ".00S";
builder.Append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
var profile = string.Equals(GetSegmentFileExtension(state), ".ts", StringComparison.OrdinalIgnoreCase)
? "urn:mpeg:dash:profile:mp2t-simple:2011"
: "urn:mpeg:dash:profile:mp2t-simple:2011";
builder.AppendFormat(
"<MPD xmlns=\"urn:mpeg:dash:schema:mpd:2011\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"urn:mpeg:dash:schema:mpd:2011 http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-DASH_schema_files/DASH-MPD.xsd\" minBufferTime=\"PT2.00S\" mediaPresentationDuration=\"{0}\" maxSegmentDuration=\"PT{1}S\" type=\"static\" profiles=\""+profile+"\">",
duration,
state.SegmentLength.ToString(CultureInfo.InvariantCulture));
builder.Append("<ProgramInformation moreInformationURL=\"http://gpac.sourceforge.net\">");
builder.Append("</ProgramInformation>");
builder.AppendFormat("<Period start=\"PT0S\" duration=\"{0}\">", duration);
builder.Append("<AdaptationSet segmentAlignment=\"true\">");
builder.Append("<ContentComponent id=\"1\" contentType=\"video\"/>");
var lang = state.AudioStream != null ? state.AudioStream.Language : null;
if (string.IsNullOrWhiteSpace(lang)) lang = "und";
builder.AppendFormat("<ContentComponent id=\"2\" contentType=\"audio\" lang=\"{0}\"/>", lang);
builder.Append(GetRepresentationOpenElement(state, lang));
AppendSegmentList(state, builder);
builder.Append("</Representation>");
builder.Append("</AdaptationSet>");
builder.Append("</Period>");
builder.Append("</MPD>");
return builder.ToString();
}
private string GetRepresentationOpenElement(StreamState state, string language)
{
var codecs = GetVideoCodecDescriptor(state) + "," + GetAudioCodecDescriptor(state);
var mime = string.Equals(GetSegmentFileExtension(state), ".ts", StringComparison.OrdinalIgnoreCase)
? "video/mp2t"
: "video/mp4";
var xml = "<Representation id=\"1\" mimeType=\"" + mime + "\" startWithSAP=\"1\" codecs=\"" + codecs + "\"";
if (state.OutputWidth.HasValue)
{
xml += " width=\"" + state.OutputWidth.Value.ToString(UsCulture) + "\"";
}
if (state.OutputHeight.HasValue)
{
xml += " height=\"" + state.OutputHeight.Value.ToString(UsCulture) + "\"";
}
if (state.OutputAudioSampleRate.HasValue)
{
xml += " sampleRate=\"" + state.OutputAudioSampleRate.Value.ToString(UsCulture) + "\"";
}
if (state.TotalOutputBitrate.HasValue)
{
xml += " bandwidth=\"" + state.TotalOutputBitrate.Value.ToString(UsCulture) + "\"";
}
xml += ">";
return xml;
}
private string GetVideoCodecDescriptor(StreamState state)
{
// https://developer.apple.com/library/ios/documentation/networkinginternet/conceptual/streamingmediaguide/FrequentlyAskedQuestions/FrequentlyAskedQuestions.html
// http://www.chipwreck.de/blog/2010/02/25/html-5-video-tag-and-attributes/
var level = state.TargetVideoLevel ?? 0;
var profile = state.TargetVideoProfile ?? string.Empty;
if (profile.IndexOf("high", StringComparison.OrdinalIgnoreCase) != -1)
{
if (level >= 4.1)
{
return "avc1.640028";
}
if (level >= 4)
{
return "avc1.640028";
}
return "avc1.64001f";
}
if (profile.IndexOf("main", StringComparison.OrdinalIgnoreCase) != -1)
{
if (level >= 4)
{
return "avc1.4d0028";
}
if (level >= 3.1)
{
return "avc1.4d001f";
}
return "avc1.4d001e";
}
if (level >= 3.1)
{
return "avc1.42001f";
}
return "avc1.42E01E";
}
private string GetAudioCodecDescriptor(StreamState state)
{
// https://developer.apple.com/library/ios/documentation/networkinginternet/conceptual/streamingmediaguide/FrequentlyAskedQuestions/FrequentlyAskedQuestions.html
if (string.Equals(state.OutputAudioCodec, "mp3", StringComparison.OrdinalIgnoreCase))
{
return "mp4a.40.34";
}
// AAC 5ch
if (state.OutputAudioChannels.HasValue && state.OutputAudioChannels.Value >= 5)
{
return "mp4a.40.5";
}
// AAC 2ch
return "mp4a.40.2";
}
public object Get(GetDashSegment request)
{
return GetDynamicSegment(request, request.SegmentId).Result;
}
private void AppendSegmentList(StreamState state, StringBuilder builder)
{
var extension = GetSegmentFileExtension(state);
var seconds = TimeSpan.FromTicks(state.RunTimeTicks ?? 0).TotalSeconds;
var queryStringIndex = Request.RawUrl.IndexOf('?');
var queryString = queryStringIndex == -1 ? string.Empty : Request.RawUrl.Substring(queryStringIndex);
var index = 0;
builder.Append("<SegmentList timescale=\"1000\" duration=\"10000\">");
while (seconds > 0)
{
var segmentUrl = string.Format("dash/{0}{1}{2}",
index.ToString(UsCulture),
extension,
SecurityElement.Escape(queryString));
if (index == 0)
{
builder.AppendFormat("<Initialization sourceURL=\"{0}\"/>", segmentUrl);
}
else
{
builder.AppendFormat("<SegmentURL media=\"{0}\"/>", segmentUrl);
}
seconds -= state.SegmentLength;
index++;
}
builder.Append("</SegmentList>");
}
private async Task<object> GetDynamicSegment(VideoStreamRequest request, string segmentId)
{
if ((request.StartTimeTicks ?? 0) > 0)
{
throw new ArgumentException("StartTimeTicks is not allowed.");
}
var cancellationTokenSource = new CancellationTokenSource();
var cancellationToken = cancellationTokenSource.Token;
var index = int.Parse(segmentId, NumberStyles.Integer, UsCulture);
var state = await GetState(request, cancellationToken).ConfigureAwait(false);
var playlistPath = Path.ChangeExtension(state.OutputFilePath, ".m3u8");
var segmentExtension = GetSegmentFileExtension(state);
var segmentPath = GetSegmentPath(playlistPath, segmentExtension, index);
var segmentLength = state.SegmentLength;
TranscodingJob job = null;
if (File.Exists(segmentPath))
{
return await GetSegmentResult(playlistPath, segmentPath, index, segmentLength, job, cancellationToken).ConfigureAwait(false);
}
await ApiEntryPoint.Instance.TranscodingStartLock.WaitAsync(cancellationTokenSource.Token).ConfigureAwait(false);
try
{
if (File.Exists(segmentPath))
{
return await GetSegmentResult(playlistPath, segmentPath, index, segmentLength, job, cancellationToken).ConfigureAwait(false);
}
else
{
var currentTranscodingIndex = GetCurrentTranscodingIndex(playlistPath, segmentExtension);
if (currentTranscodingIndex == null || index < currentTranscodingIndex.Value || (index - currentTranscodingIndex.Value) > 4)
{
// If the playlist doesn't already exist, startup ffmpeg
try
{
ApiEntryPoint.Instance.KillTranscodingJobs(j => j.Type == TranscodingJobType && string.Equals(j.DeviceId, request.DeviceId, StringComparison.OrdinalIgnoreCase), p => !string.Equals(p, playlistPath, StringComparison.OrdinalIgnoreCase));
if (currentTranscodingIndex.HasValue)
{
DeleteLastFile(playlistPath, segmentExtension, 0);
}
var startSeconds = index * state.SegmentLength;
request.StartTimeTicks = TimeSpan.FromSeconds(startSeconds).Ticks;
job = await StartFfMpeg(state, playlistPath, cancellationTokenSource, Path.GetDirectoryName(playlistPath)).ConfigureAwait(false);
}
catch
{
state.Dispose();
throw;
}
await WaitForMinimumSegmentCount(playlistPath, 2, cancellationTokenSource.Token).ConfigureAwait(false);
}
}
}
finally
{
ApiEntryPoint.Instance.TranscodingStartLock.Release();
}
Logger.Info("waiting for {0}", segmentPath);
while (!File.Exists(segmentPath))
{
await Task.Delay(50, cancellationToken).ConfigureAwait(false);
}
Logger.Info("returning {0}", segmentPath);
job = job ?? ApiEntryPoint.Instance.GetTranscodingJob(playlistPath, TranscodingJobType);
return await GetSegmentResult(playlistPath, segmentPath, index, segmentLength, job, cancellationToken).ConfigureAwait(false);
}
private async Task<object> GetSegmentResult(string playlistPath,
string segmentPath,
int segmentIndex,
int segmentLength,
TranscodingJob transcodingJob,
CancellationToken cancellationToken)
{
// If all transcoding has completed, just return immediately
if (!IsTranscoding(playlistPath))
{
return GetSegmentResult(segmentPath, segmentIndex, segmentLength, transcodingJob);
}
var segmentFilename = Path.GetFileName(segmentPath);
using (var fileStream = FileSystem.GetFileStream(playlistPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, true))
{
using (var reader = new StreamReader(fileStream))
{
var text = await reader.ReadToEndAsync().ConfigureAwait(false);
// If it appears in the playlist, it's done
if (text.IndexOf(segmentFilename, StringComparison.OrdinalIgnoreCase) != -1)
{
return GetSegmentResult(segmentPath, segmentIndex, segmentLength, transcodingJob);
}
}
}
// if a different file is encoding, it's done
//var currentTranscodingIndex = GetCurrentTranscodingIndex(playlistPath);
//if (currentTranscodingIndex > segmentIndex)
//{
//return GetSegmentResult(segmentPath, segmentIndex);
//}
// Wait for the file to stop being written to, then stream it
var length = new FileInfo(segmentPath).Length;
var eofCount = 0;
while (eofCount < 10)
{
var info = new FileInfo(segmentPath);
if (!info.Exists)
{
break;
}
var newLength = info.Length;
if (newLength == length)
{
eofCount++;
}
else
{
eofCount = 0;
}
length = newLength;
await Task.Delay(100, cancellationToken).ConfigureAwait(false);
}
return GetSegmentResult(segmentPath, segmentIndex, segmentLength, transcodingJob);
}
private object GetSegmentResult(string segmentPath, int index, int segmentLength, TranscodingJob transcodingJob)
{
var segmentEndingSeconds = (1 + index) * segmentLength;
var segmentEndingPositionTicks = TimeSpan.FromSeconds(segmentEndingSeconds).Ticks;
return ResultFactory.GetStaticFileResult(Request, new StaticFileResultOptions
{
Path = segmentPath,
FileShare = FileShare.ReadWrite,
OnComplete = () =>
{
if (transcodingJob != null)
{
transcodingJob.DownloadPositionTicks = Math.Max(transcodingJob.DownloadPositionTicks ?? segmentEndingPositionTicks, segmentEndingPositionTicks);
}
}
});
}
private bool IsTranscoding(string playlistPath)
{
var job = ApiEntryPoint.Instance.GetTranscodingJob(playlistPath, TranscodingJobType);
return job != null && !job.HasExited;
}
public int? GetCurrentTranscodingIndex(string playlist, string segmentExtension)
{
var file = GetLastTranscodingFile(playlist, segmentExtension, FileSystem);
if (file == null)
{
return null;
}
var playlistFilename = Path.GetFileNameWithoutExtension(playlist);
var indexString = Path.GetFileNameWithoutExtension(file.Name).Substring(playlistFilename.Length);
return int.Parse(indexString, NumberStyles.Integer, UsCulture);
}
private void DeleteLastFile(string path, string segmentExtension, int retryCount)
{
if (retryCount >= 5)
{
return;
}
var file = GetLastTranscodingFile(path, segmentExtension, FileSystem);
if (file != null)
{
try
{
File.Delete(file.FullName);
}
catch (IOException ex)
{
Logger.ErrorException("Error deleting partial stream file(s) {0}", ex, file.FullName);
Thread.Sleep(100);
DeleteLastFile(path, segmentExtension, retryCount + 1);
}
catch (Exception ex)
{
Logger.ErrorException("Error deleting partial stream file(s) {0}", ex, file.FullName);
}
}
}
private static FileInfo GetLastTranscodingFile(string playlist, string segmentExtension, IFileSystem fileSystem)
{
var folder = Path.GetDirectoryName(playlist);
try
{
return new DirectoryInfo(folder)
.EnumerateFiles("*", SearchOption.TopDirectoryOnly)
.Where(i => string.Equals(i.Extension, segmentExtension, StringComparison.OrdinalIgnoreCase))
.OrderByDescending(fileSystem.GetLastWriteTimeUtc)
.FirstOrDefault();
}
catch (DirectoryNotFoundException)
{
return null;
}
}
protected override int GetStartNumber(StreamState state)
{
return GetStartNumber(state.VideoRequest);
}
private int GetStartNumber(VideoStreamRequest request)
{
var segmentId = "0";
var segmentRequest = request as GetDynamicHlsVideoSegment;
if (segmentRequest != null)
{
segmentId = segmentRequest.SegmentId;
}
return int.Parse(segmentId, NumberStyles.Integer, UsCulture);
}
private string GetSegmentPath(string playlist, string segmentExtension, int index)
{
var folder = Path.GetDirectoryName(playlist);
var filename = Path.GetFileNameWithoutExtension(playlist);
return Path.Combine(folder, filename + index.ToString("000", UsCulture) + segmentExtension);
}
protected override string GetAudioArguments(StreamState state)
{
var codec = state.OutputAudioCodec;
if (codec.Equals("copy", StringComparison.OrdinalIgnoreCase))
{
return "-codec:a:0 copy";
}
var args = "-codec:a:0 " + codec;
var channels = state.OutputAudioChannels;
if (channels.HasValue)
{
args += " -ac " + channels.Value;
}
var bitrate = state.OutputAudioBitrate;
if (bitrate.HasValue)
{
args += " -ab " + bitrate.Value.ToString(UsCulture);
}
args += " " + GetAudioFilterParam(state, true);
return args;
}
protected override string GetVideoArguments(StreamState state)
{
var codec = state.OutputVideoCodec;
// See if we can save come cpu cycles by avoiding encoding
if (codec.Equals("copy", StringComparison.OrdinalIgnoreCase))
{
return IsH264(state.VideoStream) ? "-codec:v:0 copy -bsf:v h264_mp4toannexb" : "-codec:v:0 copy";
}
var keyFrameArg = string.Format(" -force_key_frames expr:gte(t,n_forced*{0})",
state.SegmentLength.ToString(UsCulture));
var hasGraphicalSubs = state.SubtitleStream != null && !state.SubtitleStream.IsTextSubtitleStream;
var args = "-codec:v:0 " + codec + " " + GetVideoQualityParam(state, "libx264", true) + keyFrameArg;
args += " -r 24 -g 24";
// Add resolution params, if specified
if (!hasGraphicalSubs)
{
args += GetOutputSizeParam(state, codec, false);
}
// This is for internal graphical subs
if (hasGraphicalSubs)
{
args += GetGraphicalSubtitleParam(state, codec);
}
return args;
}
protected override string GetCommandLineArguments(string outputPath, string transcodingJobId, StreamState state, bool isEncoding)
{
// test url http://192.168.1.2:8096/mediabrowser/videos/233e8905d559a8f230db9bffd2ac9d6d/master.mpd?mediasourceid=233e8905d559a8f230db9bffd2ac9d6d&videocodec=h264&audiocodec=aac&maxwidth=1280&videobitrate=500000&audiobitrate=128000&profile=baseline&level=3
// Good info on i-frames http://blog.streamroot.io/encode-multi-bitrate-videos-mpeg-dash-mse-based-media-players/
var threads = GetNumberOfThreads(state, false);
var inputModifier = GetInputModifier(state);
// If isEncoding is true we're actually starting ffmpeg
var startNumberParam = isEncoding ? GetStartNumber(state).ToString(UsCulture) : "0";
var segmentFilename = Path.GetFileNameWithoutExtension(outputPath) + "%03d" + GetSegmentFileExtension(state);
var args = string.Format("{0} -i {1} -map_metadata -1 -threads {2} {3} {4} -copyts {5} -f ssegment -segment_time {6} -segment_list_size {8} -segment_list \"{9}\" {10}",
inputModifier,
GetInputArgument(transcodingJobId, state),
threads,
GetMapArgs(state),
GetVideoArguments(state),
GetAudioArguments(state),
state.SegmentLength.ToString(UsCulture),
startNumberParam,
state.HlsListSize.ToString(UsCulture),
outputPath,
segmentFilename
).Trim();
return args;
}
/// <summary>
/// Gets the segment file extension.
/// </summary>
/// <param name="state">The state.</param>
/// <returns>System.String.</returns>
protected override string GetSegmentFileExtension(StreamState state)
{
return ".mp4";
}
protected override TranscodingJobType TranscodingJobType
{
get
{
return TranscodingJobType.Dash;
}
}
}
}