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using System.IO;
using MediaBrowser.Common.IO;
using MediaBrowser.Controller;
using MediaBrowser.Controller.Library;
using System;
using ServiceStack.ServiceHost;
namespace MediaBrowser.Api.Playback.Hls
{
[Route("/Videos/{Id}/stream.m3u8", "GET")]
[ServiceStack.ServiceHost.Api(Description = "Gets a video stream using HTTP live streaming.")]
public class GetHlsVideoStream : VideoStreamRequest
{
}
[Route("/Videos/{Id}/segments/{SegmentId}/stream.ts", "GET")]
[ServiceStack.ServiceHost.Api(Description = "Gets an Http live streaming segment file. Internal use only.")]
public class GetHlsVideoSegment
{
public string Id { get; set; }
public string SegmentId { get; set; }
}
public class VideoHlsService : BaseHlsService
{
public VideoHlsService(IServerApplicationPaths appPaths, IUserManager userManager, ILibraryManager libraryManager, IIsoManager isoManager)
: base(appPaths, userManager, libraryManager, isoManager)
{
}
public object Get(GetHlsVideoSegment request)
{
var file = SegmentFilePrefix + request.SegmentId + Path.GetExtension(RequestContext.PathInfo);
file = Path.Combine(ApplicationPaths.EncodedMediaCachePath, file);
return ResultFactory.GetStaticFileResult(RequestContext, file);
}
/// <summary>
/// Gets the specified request.
/// </summary>
/// <param name="request">The request.</param>
/// <returns>System.Object.</returns>
public object Get(GetHlsVideoStream request)
{
return ProcessRequest(request);
}
/// <summary>
/// Gets the audio arguments.
/// </summary>
/// <param name="state">The state.</param>
/// <returns>System.String.</returns>
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;
}
if (state.Request.AudioSampleRate.HasValue)
{
args += " -ar " + state.Request.AudioSampleRate.Value;
}
if (state.Request.AudioBitRate.HasValue)
{
args += " -ab " + state.Request.AudioBitRate.Value;
}
var volParam = string.Empty;
// Boost volume to 200% when downsampling from 6ch to 2ch
if (channels.HasValue && channels.Value <= 2 && state.AudioStream.Channels.HasValue && state.AudioStream.Channels.Value > 5)
{
volParam = ",volume=2.000000";
}
args += string.Format(" -af \"aresample=async=1000,{0}\"", volParam);
return args;
}
return args;
}
/// <summary>
/// Gets the video arguments.
/// </summary>
/// <param name="state">The state.</param>
/// <returns>System.String.</returns>
protected override string GetVideoArguments(StreamState state)
{
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";
}
var args = "-codec:v:0 " + codec + " -preset superfast";
if (state.VideoRequest.VideoBitRate.HasValue)
{
args += string.Format(" -b:v {0}", state.VideoRequest.VideoBitRate.Value);
}
// Add resolution params, if specified
if (state.VideoRequest.Width.HasValue || state.VideoRequest.Height.HasValue || state.VideoRequest.MaxHeight.HasValue || state.VideoRequest.MaxWidth.HasValue)
{
args += GetOutputSizeParam(state, codec);
}
// Get the output framerate based on the FrameRate param
var framerate = state.VideoRequest.Framerate ?? 0;
// We have to supply a framerate for hls, so if it's null, account for that here
if (framerate.Equals(0))
{
framerate = state.VideoStream.AverageFrameRate ?? 0;
}
if (framerate.Equals(0))
{
framerate = state.VideoStream.RealFrameRate ?? 0;
}
if (framerate.Equals(0))
{
framerate = 23.976;
}
framerate = Math.Round(framerate);
args += string.Format(" -r {0}", framerate);
// Needed to ensure segments stay under 10 seconds
args += string.Format(" -g {0}", framerate);
args += " -vsync vfr";
if (state.SubtitleStream != null)
{
// This is for internal graphical subs
if (!state.SubtitleStream.IsExternal && (state.SubtitleStream.Codec.IndexOf("pgs", StringComparison.OrdinalIgnoreCase) != -1 || state.SubtitleStream.Codec.IndexOf("dvd", StringComparison.OrdinalIgnoreCase) != -1))
{
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";
}
}
}
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