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using MediaBrowser.Common.IO;
using MediaBrowser.Common.MediaInfo;
using MediaBrowser.Controller;
using MediaBrowser.Controller.Dto;
using MediaBrowser.Controller.Library;
using MediaBrowser.Model.IO;
using ServiceStack.ServiceHost;
using System;
namespace MediaBrowser.Api.Playback.Hls
{
/// <summary>
/// Class GetHlsVideoStream
/// </summary>
[Route("/Videos/{Id}/stream.m3u8", "GET")]
[Api(Description = "Gets a video stream using HTTP live streaming.")]
public class GetHlsVideoStream : 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; }
[ApiMember(Name = "TimeStampOffsetMs", Description = "Optional. Alter the timestamps in the playlist by a given amount, in ms. Default is 1000.", IsRequired = false, DataType = "int", ParameterType = "query", Verb = "GET")]
public int TimeStampOffsetMs { get; set; }
}
/// <summary>
/// Class VideoHlsService
/// </summary>
public class VideoHlsService : BaseHlsService
{
/// <summary>
/// Initializes a new instance of the <see cref="BaseStreamingService" /> class.
/// </summary>
/// <param name="appPaths">The app paths.</param>
/// <param name="userManager">The user manager.</param>
/// <param name="libraryManager">The library manager.</param>
/// <param name="isoManager">The iso manager.</param>
/// <param name="mediaEncoder">The media encoder.</param>
/// <param name="dtoService">The dto service.</param>
public VideoHlsService(IServerApplicationPaths appPaths, IUserManager userManager, ILibraryManager libraryManager, IIsoManager isoManager, IMediaEncoder mediaEncoder, IDtoService dtoService, IFileSystem fileSystem)
: base(appPaths, userManager, libraryManager, isoManager, mediaEncoder, dtoService, fileSystem)
{
}
/// <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;
}
var bitrate = GetAudioBitrateParam(state);
if (bitrate.HasValue)
{
args += " -ab " + bitrate.Value.ToString(UsCulture);
}
var volParam = string.Empty;
var AudioSampleRate = 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";
}
if (state.Request.AudioSampleRate.HasValue)
{
AudioSampleRate= state.Request.AudioSampleRate.Value + ":";
}
args += string.Format(" -af \"adelay=1,aresample={0}async=1000{1}\"",AudioSampleRate, volParam);
return args;
}
return args;
}
/// <summary>
/// Gets the video arguments.
/// </summary>
/// <param name="state">The state.</param>
/// <param name="performSubtitleConversion">if set to <c>true</c> [perform subtitle conversion].</param>
/// <returns>System.String.</returns>
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 args = "-codec:v:0 " + codec + " -preset superfast" + keyFrameArg;
var bitrate = GetVideoBitrateParam(state);
if (bitrate.HasValue)
{
args += string.Format(" -b:v {0} -maxrate ({0}*.85) -bufsize {0}", bitrate.Value.ToString(UsCulture));
}
// 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, performSubtitleConversion);
}
// 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 (state.VideoStream != null)
{
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);
args += " -vsync vfr";
if (!string.IsNullOrEmpty(state.VideoRequest.Profile))
{
args += " -profile:v " + state.VideoRequest.Profile;
}
if (!string.IsNullOrEmpty(state.VideoRequest.Level))
{
args += " -level " + state.VideoRequest.Level;
}
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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