jellyfin/MediaBrowser.Api/Playback/Hls/VideoHlsService.cs

using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Devices;
using MediaBrowser.Controller.Dlna;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.MediaEncoding;
using MediaBrowser.Model.IO;
using MediaBrowser.Model.Serialization;
using ServiceStack;
using System;
using CommonIO;
using MediaBrowser.Model.Dlna;

namespace MediaBrowser.Api.Playback.Hls
{
    [Route("/Videos/{Id}/live.m3u8", "GET")]
    [Api(Description = "Gets a video stream using HTTP live streaming.")]
    public class GetLiveHlsStream : VideoStreamRequest
    {
    }

    /// <summary>
    /// Class VideoHlsService
    /// </summary>
    public class VideoHlsService : BaseHlsService
    {
        public VideoHlsService(IServerConfigurationManager serverConfig, IUserManager userManager, ILibraryManager libraryManager, IIsoManager isoManager, IMediaEncoder mediaEncoder, IFileSystem fileSystem, IDlnaManager dlnaManager, ISubtitleEncoder subtitleEncoder, IDeviceManager deviceManager, IMediaSourceManager mediaSourceManager, IZipClient zipClient, IJsonSerializer jsonSerializer) : base(serverConfig, userManager, libraryManager, isoManager, mediaEncoder, fileSystem, dlnaManager, subtitleEncoder, deviceManager, mediaSourceManager, zipClient, jsonSerializer)
        {
        }

        public object Get(GetLiveHlsStream request)
        {
            return ProcessRequest(request, true);
        }

        /// <summary>
        /// Gets the audio arguments.
        /// </summary>
        /// <param name="state">The state.</param>
        /// <returns>System.String.</returns>
        protected override string GetAudioArguments(StreamState state)
        {
            var codec = GetAudioEncoder(state);

            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;
        }

        /// <summary>
        /// Gets the video arguments.
        /// </summary>
        /// <param name="state">The state.</param>
        /// <returns>System.String.</returns>
        protected override string GetVideoArguments(StreamState state)
        {
            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 (codec.Equals("copy", StringComparison.OrdinalIgnoreCase))
            {
                // if h264_mp4toannexb is ever added, do not use it for live tv
                if (state.VideoStream != null && IsH264(state.VideoStream) && !string.Equals(state.VideoStream.NalLengthSize, "0", StringComparison.OrdinalIgnoreCase))
                {
                    Logger.Debug("Enabling h264_mp4toannexb due to nal_length_size of {0}", state.VideoStream.NalLengthSize);
                    args += " -bsf:v h264_mp4toannexb";
                }
                return args;
            }

            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;

            // Add resolution params, if specified
            if (!hasGraphicalSubs)
            {
                args += GetOutputSizeParam(state, codec);
            }

            // This is for internal graphical subs
            if (hasGraphicalSubs)
            {
                args += GetGraphicalSubtitleParam(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";
        }
    }
}