jellyfin-server/MediaBrowser.Api/Playback/Hls/DynamicHlsService.cs
2016-10-20 14:02:42 -04:00

947 lines
36 KiB
C#

using MediaBrowser.Common.Net;
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.Dlna;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Extensions;
using MediaBrowser.Model.IO;
using MediaBrowser.Model.Serialization;
using ServiceStack;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using CommonIO;
using MimeTypes = MediaBrowser.Model.Net.MimeTypes;
namespace MediaBrowser.Api.Playback.Hls
{
/// <summary>
/// Options is needed for chromecast. Threw Head in there since it's related
/// </summary>
[Route("/Videos/{Id}/master.m3u8", "GET", Summary = "Gets a video stream using HTTP live streaming.")]
[Route("/Videos/{Id}/master.m3u8", "HEAD", Summary = "Gets a video stream using HTTP live streaming.")]
public class GetMasterHlsVideoPlaylist : VideoStreamRequest, IMasterHlsRequest
{
public bool EnableAdaptiveBitrateStreaming { get; set; }
public GetMasterHlsVideoPlaylist()
{
EnableAdaptiveBitrateStreaming = true;
}
}
[Route("/Audio/{Id}/master.m3u8", "GET", Summary = "Gets an audio stream using HTTP live streaming.")]
[Route("/Audio/{Id}/master.m3u8", "HEAD", Summary = "Gets an audio stream using HTTP live streaming.")]
public class GetMasterHlsAudioPlaylist : StreamRequest, IMasterHlsRequest
{
public bool EnableAdaptiveBitrateStreaming { get; set; }
public GetMasterHlsAudioPlaylist()
{
EnableAdaptiveBitrateStreaming = true;
}
}
public interface IMasterHlsRequest
{
bool EnableAdaptiveBitrateStreaming { get; set; }
}
[Route("/Videos/{Id}/main.m3u8", "GET", Summary = "Gets a video stream using HTTP live streaming.")]
public class GetVariantHlsVideoPlaylist : VideoStreamRequest
{
}
[Route("/Audio/{Id}/main.m3u8", "GET", Summary = "Gets an audio stream using HTTP live streaming.")]
public class GetVariantHlsAudioPlaylist : StreamRequest
{
}
[Route("/Videos/{Id}/hls1/{PlaylistId}/{SegmentId}.ts", "GET")]
[Api(Description = "Gets an Http live streaming segment file. Internal use only.")]
public class GetHlsVideoSegment : VideoStreamRequest
{
public string PlaylistId { get; set; }
/// <summary>
/// Gets or sets the segment id.
/// </summary>
/// <value>The segment id.</value>
public string SegmentId { get; set; }
}
[Route("/Audio/{Id}/hls1/{PlaylistId}/{SegmentId}.aac", "GET")]
[Route("/Audio/{Id}/hls1/{PlaylistId}/{SegmentId}.ts", "GET")]
[Api(Description = "Gets an Http live streaming segment file. Internal use only.")]
public class GetHlsAudioSegment : StreamRequest
{
public string PlaylistId { get; set; }
/// <summary>
/// Gets or sets the segment id.
/// </summary>
/// <value>The segment id.</value>
public string SegmentId { get; set; }
}
public class DynamicHlsService : BaseHlsService
{
public DynamicHlsService(IServerConfigurationManager serverConfig, IUserManager userManager, ILibraryManager libraryManager, IIsoManager isoManager, IMediaEncoder mediaEncoder, IFileSystem fileSystem, IDlnaManager dlnaManager, ISubtitleEncoder subtitleEncoder, IDeviceManager deviceManager, IMediaSourceManager mediaSourceManager, IZipClient zipClient, IJsonSerializer jsonSerializer, INetworkManager networkManager)
: base(serverConfig, userManager, libraryManager, isoManager, mediaEncoder, fileSystem, dlnaManager, subtitleEncoder, deviceManager, mediaSourceManager, zipClient, jsonSerializer)
{
NetworkManager = networkManager;
}
protected INetworkManager NetworkManager { get; private set; }
public Task<object> Get(GetMasterHlsVideoPlaylist request)
{
return GetMasterPlaylistInternal(request, "GET");
}
public Task<object> Head(GetMasterHlsVideoPlaylist request)
{
return GetMasterPlaylistInternal(request, "HEAD");
}
public Task<object> Get(GetMasterHlsAudioPlaylist request)
{
return GetMasterPlaylistInternal(request, "GET");
}
public Task<object> Head(GetMasterHlsAudioPlaylist request)
{
return GetMasterPlaylistInternal(request, "HEAD");
}
public Task<object> Get(GetVariantHlsVideoPlaylist request)
{
return GetVariantPlaylistInternal(request, true, "main");
}
public Task<object> Get(GetVariantHlsAudioPlaylist request)
{
return GetVariantPlaylistInternal(request, false, "main");
}
public Task<object> Get(GetHlsVideoSegment request)
{
return GetDynamicSegment(request, request.SegmentId);
}
public Task<object> Get(GetHlsAudioSegment request)
{
return GetDynamicSegment(request, request.SegmentId);
}
private async Task<object> GetDynamicSegment(StreamRequest request, string segmentId)
{
if ((request.StartTimeTicks ?? 0) > 0)
{
throw new ArgumentException("StartTimeTicks is not allowed.");
}
var cancellationTokenSource = new CancellationTokenSource();
var cancellationToken = cancellationTokenSource.Token;
var requestedIndex = int.Parse(segmentId, NumberStyles.Integer, UsCulture);
var state = await GetState(request, cancellationToken).ConfigureAwait(false);
var playlistPath = Path.ChangeExtension(state.OutputFilePath, ".m3u8");
var segmentPath = GetSegmentPath(state, playlistPath, requestedIndex);
var segmentExtension = GetSegmentFileExtension(state);
TranscodingJob job = null;
if (FileSystem.FileExists(segmentPath))
{
job = ApiEntryPoint.Instance.OnTranscodeBeginRequest(playlistPath, TranscodingJobType);
return await GetSegmentResult(state, playlistPath, segmentPath, requestedIndex, job, cancellationToken).ConfigureAwait(false);
}
var transcodingLock = ApiEntryPoint.Instance.GetTranscodingLock(playlistPath);
await transcodingLock.WaitAsync(cancellationTokenSource.Token).ConfigureAwait(false);
var released = false;
try
{
if (FileSystem.FileExists(segmentPath))
{
job = ApiEntryPoint.Instance.OnTranscodeBeginRequest(playlistPath, TranscodingJobType);
transcodingLock.Release();
released = true;
return await GetSegmentResult(state, playlistPath, segmentPath, requestedIndex, job, cancellationToken).ConfigureAwait(false);
}
else
{
var startTranscoding = false;
var currentTranscodingIndex = GetCurrentTranscodingIndex(playlistPath, segmentExtension);
var segmentGapRequiringTranscodingChange = 24 / state.SegmentLength;
if (currentTranscodingIndex == null)
{
Logger.Debug("Starting transcoding because currentTranscodingIndex=null");
startTranscoding = true;
}
else if (requestedIndex < currentTranscodingIndex.Value)
{
Logger.Debug("Starting transcoding because requestedIndex={0} and currentTranscodingIndex={1}", requestedIndex, currentTranscodingIndex);
startTranscoding = true;
}
else if (requestedIndex - currentTranscodingIndex.Value > segmentGapRequiringTranscodingChange)
{
Logger.Debug("Starting transcoding because segmentGap is {0} and max allowed gap is {1}. requestedIndex={2}", requestedIndex - currentTranscodingIndex.Value, segmentGapRequiringTranscodingChange, requestedIndex);
startTranscoding = true;
}
if (startTranscoding)
{
// If the playlist doesn't already exist, startup ffmpeg
try
{
ApiEntryPoint.Instance.KillTranscodingJobs(request.DeviceId, request.PlaySessionId, p => false);
if (currentTranscodingIndex.HasValue)
{
DeleteLastFile(playlistPath, segmentExtension, 0);
}
request.StartTimeTicks = GetStartPositionTicks(state, requestedIndex);
job = await StartFfMpeg(state, playlistPath, cancellationTokenSource).ConfigureAwait(false);
}
catch
{
state.Dispose();
throw;
}
//await WaitForMinimumSegmentCount(playlistPath, 1, cancellationTokenSource.Token).ConfigureAwait(false);
}
else
{
job = ApiEntryPoint.Instance.OnTranscodeBeginRequest(playlistPath, TranscodingJobType);
if (job.TranscodingThrottler != null)
{
job.TranscodingThrottler.UnpauseTranscoding();
}
}
}
}
finally
{
if (!released)
{
transcodingLock.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.OnTranscodeBeginRequest(playlistPath, TranscodingJobType);
return await GetSegmentResult(state, playlistPath, segmentPath, requestedIndex, job, cancellationToken).ConfigureAwait(false);
}
private const int BufferSize = 81920;
private long GetStartPositionTicks(StreamState state, int requestedIndex)
{
double startSeconds = 0;
var lengths = GetSegmentLengths(state);
for (var i = 0; i < requestedIndex; i++)
{
startSeconds += lengths[requestedIndex];
}
var position = TimeSpan.FromSeconds(startSeconds).Ticks;
return position;
}
private long GetEndPositionTicks(StreamState state, int requestedIndex)
{
double startSeconds = 0;
var lengths = GetSegmentLengths(state);
for (var i = 0; i <= requestedIndex; i++)
{
startSeconds += lengths[requestedIndex];
}
var position = TimeSpan.FromSeconds(startSeconds).Ticks;
return position;
}
private double[] GetSegmentLengths(StreamState state)
{
var result = new List<double>();
var ticks = state.RunTimeTicks ?? 0;
var segmentLengthTicks = TimeSpan.FromSeconds(state.SegmentLength).Ticks;
while (ticks > 0)
{
var length = ticks >= segmentLengthTicks ? segmentLengthTicks : ticks;
result.Add(TimeSpan.FromTicks(length).TotalSeconds);
ticks -= length;
}
return result.ToArray();
}
public int? GetCurrentTranscodingIndex(string playlist, string segmentExtension)
{
var job = ApiEntryPoint.Instance.GetTranscodingJob(playlist, TranscodingJobType);
if (job == null || job.HasExited)
{
return null;
}
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 playlistPath, string segmentExtension, int retryCount)
{
var file = GetLastTranscodingFile(playlistPath, segmentExtension, FileSystem);
if (file != null)
{
DeleteFile(file, retryCount);
}
}
private void DeleteFile(FileSystemMetadata file, int retryCount)
{
if (retryCount >= 5)
{
return;
}
try
{
FileSystem.DeleteFile(file.FullName);
}
catch (IOException ex)
{
Logger.ErrorException("Error deleting partial stream file(s) {0}", ex, file.FullName);
Thread.Sleep(100);
DeleteFile(file, retryCount + 1);
}
catch (Exception ex)
{
Logger.ErrorException("Error deleting partial stream file(s) {0}", ex, file.FullName);
}
}
private static FileSystemMetadata GetLastTranscodingFile(string playlist, string segmentExtension, IFileSystem fileSystem)
{
var folder = Path.GetDirectoryName(playlist);
var filePrefix = Path.GetFileNameWithoutExtension(playlist) ?? string.Empty;
try
{
return fileSystem.GetFiles(folder)
.Where(i => string.Equals(i.Extension, segmentExtension, StringComparison.OrdinalIgnoreCase) && Path.GetFileNameWithoutExtension(i.Name).StartsWith(filePrefix, 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 GetHlsVideoSegment;
if (segmentRequest != null)
{
segmentId = segmentRequest.SegmentId;
}
return int.Parse(segmentId, NumberStyles.Integer, UsCulture);
}
private string GetSegmentPath(StreamState state, string playlist, int index)
{
var folder = Path.GetDirectoryName(playlist);
var filename = Path.GetFileNameWithoutExtension(playlist);
return Path.Combine(folder, filename + index.ToString(UsCulture) + GetSegmentFileExtension(state));
}
private async Task<object> GetSegmentResult(StreamState state, string playlistPath,
string segmentPath,
int segmentIndex,
TranscodingJob transcodingJob,
CancellationToken cancellationToken)
{
// If all transcoding has completed, just return immediately
if (transcodingJob != null && transcodingJob.HasExited && FileSystem.FileExists(segmentPath))
{
return GetSegmentResult(state, segmentPath, segmentIndex, transcodingJob);
}
var segmentFilename = Path.GetFileName(segmentPath);
while (!cancellationToken.IsCancellationRequested)
{
try
{
using (var fileStream = GetPlaylistFileStream(playlistPath))
{
using (var reader = new StreamReader(fileStream, Encoding.UTF8, true, BufferSize))
{
var text = await reader.ReadToEndAsync().ConfigureAwait(false);
// If it appears in the playlist, it's done
if (text.IndexOf(segmentFilename, StringComparison.OrdinalIgnoreCase) != -1)
{
if (FileSystem.FileExists(segmentPath))
{
return GetSegmentResult(state, segmentPath, segmentIndex, transcodingJob);
}
//break;
}
}
}
}
catch (IOException)
{
// May get an error if the file is locked
}
await Task.Delay(100, cancellationToken).ConfigureAwait(false);
}
cancellationToken.ThrowIfCancellationRequested();
return GetSegmentResult(state, segmentPath, segmentIndex, transcodingJob);
}
private object GetSegmentResult(StreamState state, string segmentPath, int index, TranscodingJob transcodingJob)
{
var segmentEndingPositionTicks = GetEndPositionTicks(state, index);
return ResultFactory.GetStaticFileResult(Request, new StaticFileResultOptions
{
Path = segmentPath,
FileShare = FileShare.ReadWrite,
OnComplete = () =>
{
if (transcodingJob != null)
{
transcodingJob.DownloadPositionTicks = Math.Max(transcodingJob.DownloadPositionTicks ?? segmentEndingPositionTicks, segmentEndingPositionTicks);
ApiEntryPoint.Instance.OnTranscodeEndRequest(transcodingJob);
}
}
}).Result;
}
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 = IsLiveStream(state);
var queryStringIndex = Request.RawUrl.IndexOf('?');
var queryString = queryStringIndex == -1 ? string.Empty : Request.RawUrl.Substring(queryStringIndex);
// 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.VideoRequest.SubtitleMethod == 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.VideoRequest.SubtitleMethod == 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(UsCulture),
"videobitrate=" + newValue.ToString(UsCulture),
StringComparison.OrdinalIgnoreCase);
}
private void AddSubtitles(StreamState state, IEnumerable<MediaStream> subtitles, StringBuilder builder)
{
var selectedIndex = state.SubtitleStream == null || state.VideoRequest.SubtitleMethod != 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(UsCulture),
30.ToString(UsCulture),
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;
}
var request = state.Request as IMasterHlsRequest;
if (request != null && !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;
}
private void AppendPlaylist(StringBuilder builder, StreamState state, string url, int bitrate, string subtitleGroup)
{
var header = "#EXT-X-STREAM-INF:BANDWIDTH=" + bitrate.ToString(UsCulture) + ",AVERAGE-BANDWIDTH=" + bitrate.ToString(UsCulture);
// tvos wants resolution, codecs, framerate
//if (state.TargetFramerate.HasValue)
//{
// header += string.Format(",FRAME-RATE=\"{0}\"", state.TargetFramerate.Value.ToString(CultureInfo.InvariantCulture));
//}
if (!string.IsNullOrWhiteSpace(subtitleGroup))
{
header += string.Format(",SUBTITLES=\"{0}\"", subtitleGroup);
}
builder.AppendLine(header);
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(UsCulture));
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", UsCulture) + ",");
builder.AppendLine(string.Format("hls1/{0}/{1}{2}{3}",
name,
index.ToString(UsCulture),
GetSegmentFileExtension(isOutputVideo),
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)
{
var codec = GetAudioEncoder(state);
if (!state.IsOutputVideo)
{
if (string.Equals(codec, "copy", StringComparison.OrdinalIgnoreCase))
{
return "-acodec copy";
}
var audioTranscodeParams = new List<string>();
audioTranscodeParams.Add("-acodec " + codec);
if (state.OutputAudioBitrate.HasValue)
{
audioTranscodeParams.Add("-ab " + state.OutputAudioBitrate.Value.ToString(UsCulture));
}
if (state.OutputAudioChannels.HasValue)
{
audioTranscodeParams.Add("-ac " + state.OutputAudioChannels.Value.ToString(UsCulture));
}
if (state.OutputAudioSampleRate.HasValue)
{
audioTranscodeParams.Add("-ar " + state.OutputAudioSampleRate.Value.ToString(UsCulture));
}
audioTranscodeParams.Add("-vn");
return string.Join(" ", audioTranscodeParams.ToArray());
}
if (string.Equals(codec, "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)
{
if (!state.IsOutputVideo)
{
return string.Empty;
}
var codec = GetVideoEncoder(state);
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 && IsH264(state.VideoStream) && !string.Equals(state.VideoStream.NalLengthSize, "0", StringComparison.OrdinalIgnoreCase))
{
args += " -bsf:v h264_mp4toannexb";
}
args += " -flags -global_header";
}
else
{
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 && state.VideoRequest.SubtitleMethod == SubtitleDeliveryMethod.Encode;
args += " " + GetVideoQualityParam(state, GetH264Encoder(state)) + keyFrameArg;
//args += " -mixed-refs 0 -refs 3 -x264opts b_pyramid=0:weightb=0:weightp=0";
// Add resolution params, if specified
if (!hasGraphicalSubs)
{
args += GetOutputSizeParam(state, codec, EnableCopyTs(state));
}
// This is for internal graphical subs
if (hasGraphicalSubs)
{
args += GetGraphicalSubtitleParam(state, codec);
}
args += " -flags -global_header";
}
if (EnableCopyTs(state) && args.IndexOf("-copyts", StringComparison.OrdinalIgnoreCase) == -1)
{
args += " -copyts";
}
return args;
}
private bool EnableCopyTs(StreamState state)
{
//return state.SubtitleStream != null && state.SubtitleStream.IsTextSubtitleStream && state.VideoRequest.SubtitleMethod == SubtitleDeliveryMethod.Encode;
return true;
}
protected override string GetCommandLineArguments(string outputPath, StreamState state, bool isEncoding)
{
var threads = GetNumberOfThreads(state, false);
var inputModifier = GetInputModifier(state, false);
// If isEncoding is true we're actually starting ffmpeg
var startNumberParam = isEncoding ? GetStartNumber(state).ToString(UsCulture) : "0";
var toTimeParam = string.Empty;
var timestampOffsetParam = string.Empty;
if (state.IsOutputVideo && !EnableCopyTs(state) && !string.Equals(state.OutputVideoCodec, "copy", StringComparison.OrdinalIgnoreCase) && (state.Request.StartTimeTicks ?? 0) > 0)
{
timestampOffsetParam = " -output_ts_offset " + MediaEncoder.GetTimeParameter(state.Request.StartTimeTicks ?? 0).ToString(CultureInfo.InvariantCulture);
}
var mapArgs = state.IsOutputVideo ? GetMapArgs(state) : string.Empty;
var enableSplittingOnNonKeyFrames = state.VideoRequest.EnableSplittingOnNonKeyFrames && string.Equals(state.OutputVideoCodec, "copy", StringComparison.OrdinalIgnoreCase);
enableSplittingOnNonKeyFrames = false;
// TODO: check libavformat version for 57 50.100 and use -hls_flags split_by_time
var hlsProtocolSupportsSplittingByTime = false;
if (enableSplittingOnNonKeyFrames && !hlsProtocolSupportsSplittingByTime)
{
var outputTsArg = Path.Combine(Path.GetDirectoryName(outputPath), Path.GetFileNameWithoutExtension(outputPath)) + "%d" + GetSegmentFileExtension(state);
return string.Format("{0} {10} {1} -map_metadata -1 -threads {2} {3} {4} {5} -f segment -max_delay 5000000 -avoid_negative_ts disabled -start_at_zero -segment_time {6} -break_non_keyframes 1 -segment_format mpegts -segment_list_type m3u8 -segment_start_number {7} -segment_list \"{8}\" -y \"{9}\"",
inputModifier,
GetInputArgument(state),
threads,
mapArgs,
GetVideoArguments(state),
GetAudioArguments(state),
state.SegmentLength.ToString(UsCulture),
startNumberParam,
outputPath,
outputTsArg,
toTimeParam
).Trim();
}
var splitByTime = hlsProtocolSupportsSplittingByTime && enableSplittingOnNonKeyFrames;
var splitByTimeArg = splitByTime ? " -hls_flags split_by_time" : "";
return string.Format("{0}{12} {1} -map_metadata -1 -threads {2} {3} {4}{5} {6} -max_delay 5000000 -avoid_negative_ts disabled -start_at_zero -hls_time {7}{8} -start_number {9} -hls_list_size {10} -y \"{11}\"",
inputModifier,
GetInputArgument(state),
threads,
mapArgs,
GetVideoArguments(state),
timestampOffsetParam,
GetAudioArguments(state),
state.SegmentLength.ToString(UsCulture),
splitByTimeArg,
startNumberParam,
state.HlsListSize.ToString(UsCulture),
outputPath,
toTimeParam
).Trim();
}
/// <summary>
/// Gets the segment file extension.
/// </summary>
/// <param name="state">The state.</param>
/// <returns>System.String.</returns>
protected override string GetSegmentFileExtension(StreamState state)
{
return GetSegmentFileExtension(state.IsOutputVideo);
}
protected string GetSegmentFileExtension(bool isOutputVideo)
{
return isOutputVideo ? ".ts" : ".ts";
}
}
}