jellyfin/MediaBrowser.Api/Playback/Hls/DynamicHlsService.cs
2014-01-24 13:09:50 -05:00

361 lines
13 KiB
C#

using MediaBrowser.Common.Extensions;
using MediaBrowser.Common.IO;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Dto;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.LiveTv;
using MediaBrowser.Controller.MediaInfo;
using MediaBrowser.Controller.Persistence;
using MediaBrowser.Model.Dto;
using MediaBrowser.Model.IO;
using ServiceStack;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace MediaBrowser.Api.Playback.Hls
{
[Route("/Videos/{Id}/master.m3u8", "GET")]
[Api(Description = "Gets a video stream using HTTP live streaming.")]
public class GetMasterHlsVideoStream : VideoStreamRequest
{
[ApiMember(Name = "BaselineStreamAudioBitRate", Description = "Optional. Specify the audio bitrate for the baseline stream.", IsRequired = false, DataType = "int", ParameterType = "query", Verb = "GET")]
public int? BaselineStreamAudioBitRate { get; set; }
[ApiMember(Name = "AppendBaselineStream", Description = "Optional. Whether or not to include a baseline audio-only stream in the master playlist.", IsRequired = false, DataType = "bool", ParameterType = "query", Verb = "GET")]
public bool AppendBaselineStream { get; set; }
}
[Route("/Videos/{Id}/main.m3u8", "GET")]
[Api(Description = "Gets a video stream using HTTP live streaming.")]
public class GetMainHlsVideoStream : VideoStreamRequest
{
}
[Route("/Videos/{Id}/baseline.m3u8", "GET")]
[Api(Description = "Gets a video stream using HTTP live streaming.")]
public class GetBaselineHlsVideoStream : VideoStreamRequest
{
}
/// <summary>
/// Class GetHlsVideoSegment
/// </summary>
[Route("/Videos/{Id}/hlsdynamic/{PlaylistId}/{SegmentId}.ts", "GET")]
[Api(Description = "Gets an Http live streaming segment file. Internal use only.")]
public class GetDynamicHlsVideoSegment : VideoStreamRequest
{
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, IDtoService dtoService, IFileSystem fileSystem, IItemRepository itemRepository, ILiveTvManager liveTvManager)
: base(serverConfig, userManager, libraryManager, isoManager, mediaEncoder, dtoService, fileSystem, itemRepository, liveTvManager)
{
}
protected override string GetOutputFilePath(StreamState state)
{
var folder = (state.MediaPath + state.Request.DeviceId).GetMD5().ToString("N");
folder = Path.Combine(ServerConfigurationManager.ApplicationPaths.TranscodingTempPath, folder);
var outputFileExtension = GetOutputFileExtension(state);
return Path.Combine(folder, GetCommandLineArguments("dummy\\dummy", state, false).GetMD5() + (outputFileExtension ?? string.Empty).ToLower());
}
public object Get(GetMasterHlsVideoStream request)
{
var result = GetAsync(request).Result;
return result;
}
public object Get(GetDynamicHlsVideoSegment request)
{
if (string.Equals("baseline", request.PlaylistId, StringComparison.OrdinalIgnoreCase))
{
return GetDynamicSegment(request, false).Result;
}
return GetDynamicSegment(request, true).Result;
}
private async Task<object> GetDynamicSegment(GetDynamicHlsVideoSegment request, bool isMain)
{
var index = int.Parse(request.SegmentId, NumberStyles.Integer, UsCulture);
var state = await GetState(request, CancellationToken.None).ConfigureAwait(false);
var playlistPath = Path.ChangeExtension(GetOutputFilePath(state), ".m3u8");
var path = GetSegmentPath(playlistPath, index);
if (File.Exists(path))
{
return GetSegementResult(path);
}
if (!File.Exists(playlistPath))
{
await StartFfMpeg(state, playlistPath).ConfigureAwait(false);
await WaitForMinimumSegmentCount(playlistPath, GetSegmentWait()).ConfigureAwait(false);
}
return GetSegementResult(path);
}
private string GetSegmentPath(string playlist, int index)
{
var folder = Path.GetDirectoryName(playlist);
var filename = Path.GetFileNameWithoutExtension(playlist);
return Path.Combine(folder, filename + index.ToString(UsCulture) + ".ts");
}
private object GetSegementResult(string path)
{
// TODO: Handle if it's currently being written to
return ResultFactory.GetStaticFileResult(Request, path);
}
private async Task<object> GetAsync(GetMasterHlsVideoStream request)
{
var state = await GetState(request, CancellationToken.None).ConfigureAwait(false);
if (!state.VideoRequest.VideoBitRate.HasValue && (!state.VideoRequest.VideoCodec.HasValue || state.VideoRequest.VideoCodec.Value != VideoCodecs.Copy))
{
throw new ArgumentException("A video bitrate is required");
}
if (!state.Request.AudioBitRate.HasValue && (!state.Request.AudioCodec.HasValue || state.Request.AudioCodec.Value != AudioCodecs.Copy))
{
throw new ArgumentException("An audio bitrate is required");
}
int audioBitrate;
int videoBitrate;
GetPlaylistBitrates(state, out audioBitrate, out videoBitrate);
var appendBaselineStream = false;
var baselineStreamBitrate = 64000;
var hlsVideoRequest = state.VideoRequest as GetMasterHlsVideoStream;
if (hlsVideoRequest != null)
{
appendBaselineStream = hlsVideoRequest.AppendBaselineStream;
baselineStreamBitrate = hlsVideoRequest.BaselineStreamAudioBitRate ?? baselineStreamBitrate;
}
var playlistText = GetMasterPlaylistFileText(videoBitrate + audioBitrate, appendBaselineStream, baselineStreamBitrate);
return ResultFactory.GetResult(playlistText, MimeTypes.GetMimeType("playlist.m3u8"), new Dictionary<string, string>());
}
private string GetMasterPlaylistFileText(int bitrate, bool includeBaselineStream, int baselineStreamBitrate)
{
var builder = new StringBuilder();
builder.AppendLine("#EXTM3U");
// Pad a little to satisfy the apple hls validator
var paddedBitrate = Convert.ToInt32(bitrate * 1.05);
var queryStringIndex = Request.RawUrl.IndexOf('?');
var queryString = queryStringIndex == -1 ? string.Empty : Request.RawUrl.Substring(queryStringIndex);
// Main stream
builder.AppendLine("#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=" + paddedBitrate.ToString(UsCulture));
var playlistUrl = "main.m3u8" + queryString;
builder.AppendLine(playlistUrl);
// Low bitrate stream
if (includeBaselineStream)
{
builder.AppendLine("#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=" + baselineStreamBitrate.ToString(UsCulture));
playlistUrl = "baseline.m3u8" + queryString;
builder.AppendLine(playlistUrl);
}
return builder.ToString();
}
public object Get(GetMainHlsVideoStream request)
{
var result = GetPlaylistAsync(request, "main").Result;
return result;
}
public object Get(GetBaselineHlsVideoStream request)
{
var result = GetPlaylistAsync(request, "baseline").Result;
return result;
}
private async Task<object> GetPlaylistAsync(VideoStreamRequest request, string name)
{
var state = await GetState(request, CancellationToken.None).ConfigureAwait(false);
var builder = new StringBuilder();
builder.AppendLine("#EXTM3U");
builder.AppendLine("#EXT-X-VERSION:3");
builder.AppendLine("#EXT-X-TARGETDURATION:" + 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);
var seconds = TimeSpan.FromTicks(state.RunTimeTicks ?? 0).TotalSeconds;
var index = 0;
while (seconds > 0)
{
var length = seconds >= state.SegmentLength ? state.SegmentLength : seconds;
builder.AppendLine("#EXTINF:" + length.ToString(UsCulture));
builder.AppendLine(string.Format("hlsdynamic/{0}/{1}.ts{2}",
name,
index.ToString(UsCulture),
queryString));
seconds -= state.SegmentLength;
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 = GetAudioCodec(state.Request);
if (codec.Equals("copy", StringComparison.OrdinalIgnoreCase))
{
return "-codec:a:0 copy";
}
var args = "-codec:a:0 " + codec;
if (state.AudioStream != null)
{
var channels = GetNumAudioChannelsParam(state.Request, state.AudioStream);
if (channels.HasValue)
{
args += " -ac " + channels.Value;
}
var bitrate = GetAudioBitrateParam(state);
if (bitrate.HasValue)
{
args += " -ab " + bitrate.Value.ToString(UsCulture);
}
args += " " + GetAudioFilterParam(state, true);
return args;
}
return args;
}
protected override string GetVideoArguments(StreamState state, bool performSubtitleConversion)
{
var codec = GetVideoCodec(state.VideoRequest);
// 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 h264_mp4toannexb" : "-codec:v:0 copy";
}
const string keyFrameArg = " -force_key_frames expr:if(isnan(prev_forced_t),gte(t,.1),gte(t,prev_forced_t+5))";
var hasGraphicalSubs = state.SubtitleStream != null && !state.SubtitleStream.IsExternal &&
(state.SubtitleStream.Codec.IndexOf("pgs", StringComparison.OrdinalIgnoreCase) != -1 ||
state.SubtitleStream.Codec.IndexOf("dvd", StringComparison.OrdinalIgnoreCase) != -1);
var args = "-codec:v:0 " + codec + " " + GetVideoQualityParam(state, "libx264") + keyFrameArg;
var bitrate = GetVideoBitrateParam(state);
if (bitrate.HasValue)
{
args += string.Format(" -b:v {0} -maxrate ({0}*.80) -bufsize {0}", bitrate.Value.ToString(UsCulture));
}
// Add resolution params, if specified
if (!hasGraphicalSubs)
{
if (state.VideoRequest.Width.HasValue || state.VideoRequest.Height.HasValue || state.VideoRequest.MaxHeight.HasValue || state.VideoRequest.MaxWidth.HasValue)
{
args += GetOutputSizeParam(state, codec, performSubtitleConversion);
}
}
var framerate = GetFramerateParam(state);
if (framerate.HasValue)
{
args += string.Format(" -r {0}", framerate.Value.ToString(UsCulture));
}
if (!string.IsNullOrEmpty(state.VideoSync))
{
args += " -vsync " + state.VideoSync;
}
if (!string.IsNullOrEmpty(state.VideoRequest.Profile))
{
args += " -profile:v " + state.VideoRequest.Profile;
}
if (!string.IsNullOrEmpty(state.VideoRequest.Level))
{
args += " -level " + state.VideoRequest.Level;
}
// This is for internal graphical subs
if (hasGraphicalSubs)
{
args += GetInternalGraphicalSubtitleParam(state, codec);
}
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 ".ts";
}
}
}