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Diffstat (limited to 'Jellyfin.Api/Helpers/DynamicHlsHelper.cs')
| -rw-r--r-- | Jellyfin.Api/Helpers/DynamicHlsHelper.cs | 707 |
1 files changed, 707 insertions, 0 deletions
diff --git a/Jellyfin.Api/Helpers/DynamicHlsHelper.cs b/Jellyfin.Api/Helpers/DynamicHlsHelper.cs new file mode 100644 index 000000000..4abe4c5d5 --- /dev/null +++ b/Jellyfin.Api/Helpers/DynamicHlsHelper.cs @@ -0,0 +1,707 @@ +using System; +using System.Collections.Generic; +using System.Globalization; +using System.Linq; +using System.Net; +using System.Security.Claims; +using System.Text; +using System.Threading; +using System.Threading.Tasks; +using Jellyfin.Api.Models.StreamingDtos; +using MediaBrowser.Common.Extensions; +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.Net; +using Microsoft.AspNetCore.Http; +using Microsoft.AspNetCore.Mvc; +using Microsoft.Extensions.Logging; +using Microsoft.Net.Http.Headers; + +namespace Jellyfin.Api.Helpers +{ + /// <summary> + /// Dynamic hls helper. + /// </summary> + public class DynamicHlsHelper + { + private readonly ILibraryManager _libraryManager; + private readonly IUserManager _userManager; + private readonly IDlnaManager _dlnaManager; + private readonly IAuthorizationContext _authContext; + private readonly IMediaSourceManager _mediaSourceManager; + private readonly IServerConfigurationManager _serverConfigurationManager; + private readonly IMediaEncoder _mediaEncoder; + private readonly IDeviceManager _deviceManager; + private readonly TranscodingJobHelper _transcodingJobHelper; + private readonly INetworkManager _networkManager; + private readonly ILogger<DynamicHlsHelper> _logger; + private readonly IHttpContextAccessor _httpContextAccessor; + private readonly EncodingHelper _encodingHelper; + + /// <summary> + /// Initializes a new instance of the <see cref="DynamicHlsHelper"/> class. + /// </summary> + /// <param name="libraryManager">Instance of the <see cref="ILibraryManager"/> interface.</param> + /// <param name="userManager">Instance of the <see cref="IUserManager"/> interface.</param> + /// <param name="dlnaManager">Instance of the <see cref="IDlnaManager"/> interface.</param> + /// <param name="authContext">Instance of the <see cref="IAuthorizationContext"/> interface.</param> + /// <param name="mediaSourceManager">Instance of the <see cref="IMediaSourceManager"/> interface.</param> + /// <param name="serverConfigurationManager">Instance of the <see cref="IServerConfigurationManager"/> interface.</param> + /// <param name="mediaEncoder">Instance of the <see cref="IMediaEncoder"/> interface.</param> + /// <param name="deviceManager">Instance of the <see cref="IDeviceManager"/> interface.</param> + /// <param name="transcodingJobHelper">Instance of <see cref="TranscodingJobHelper"/>.</param> + /// <param name="networkManager">Instance of the <see cref="INetworkManager"/> interface.</param> + /// <param name="logger">Instance of the <see cref="ILogger{DynamicHlsHelper}"/> interface.</param> + /// <param name="httpContextAccessor">Instance of the <see cref="IHttpContextAccessor"/> interface.</param> + /// <param name="encodingHelper">Instance of <see cref="EncodingHelper"/>.</param> + public DynamicHlsHelper( + ILibraryManager libraryManager, + IUserManager userManager, + IDlnaManager dlnaManager, + IAuthorizationContext authContext, + IMediaSourceManager mediaSourceManager, + IServerConfigurationManager serverConfigurationManager, + IMediaEncoder mediaEncoder, + IDeviceManager deviceManager, + TranscodingJobHelper transcodingJobHelper, + INetworkManager networkManager, + ILogger<DynamicHlsHelper> logger, + IHttpContextAccessor httpContextAccessor, + EncodingHelper encodingHelper) + { + _libraryManager = libraryManager; + _userManager = userManager; + _dlnaManager = dlnaManager; + _authContext = authContext; + _mediaSourceManager = mediaSourceManager; + _serverConfigurationManager = serverConfigurationManager; + _mediaEncoder = mediaEncoder; + _deviceManager = deviceManager; + _transcodingJobHelper = transcodingJobHelper; + _networkManager = networkManager; + _logger = logger; + _httpContextAccessor = httpContextAccessor; + _encodingHelper = encodingHelper; + } + + /// <summary> + /// Get master hls playlist. + /// </summary> + /// <param name="transcodingJobType">Transcoding job type.</param> + /// <param name="streamingRequest">Streaming request dto.</param> + /// <param name="enableAdaptiveBitrateStreaming">Enable adaptive bitrate streaming.</param> + /// <returns>A <see cref="Task"/> containing the resulting <see cref="ActionResult"/>.</returns> + public async Task<ActionResult> GetMasterHlsPlaylist( + TranscodingJobType transcodingJobType, + StreamingRequestDto streamingRequest, + bool enableAdaptiveBitrateStreaming) + { + var isHeadRequest = _httpContextAccessor.HttpContext?.Request.Method == WebRequestMethods.Http.Head; + // CTS lifecycle is managed internally. + var cancellationTokenSource = new CancellationTokenSource(); + return await GetMasterPlaylistInternal( + streamingRequest, + isHeadRequest, + enableAdaptiveBitrateStreaming, + transcodingJobType, + cancellationTokenSource).ConfigureAwait(false); + } + + private async Task<ActionResult> GetMasterPlaylistInternal( + StreamingRequestDto streamingRequest, + bool isHeadRequest, + bool enableAdaptiveBitrateStreaming, + TranscodingJobType transcodingJobType, + CancellationTokenSource cancellationTokenSource) + { + if (_httpContextAccessor.HttpContext == null) + { + throw new ResourceNotFoundException(nameof(_httpContextAccessor.HttpContext)); + } + + using var state = await StreamingHelpers.GetStreamingState( + streamingRequest, + _httpContextAccessor.HttpContext.Request, + _authContext, + _mediaSourceManager, + _userManager, + _libraryManager, + _serverConfigurationManager, + _mediaEncoder, + _encodingHelper, + _dlnaManager, + _deviceManager, + _transcodingJobHelper, + transcodingJobType, + cancellationTokenSource.Token) + .ConfigureAwait(false); + + _httpContextAccessor.HttpContext.Response.Headers.Add(HeaderNames.Expires, "0"); + if (isHeadRequest) + { + return new FileContentResult(Array.Empty<byte>(), MimeTypes.GetMimeType("playlist.m3u8")); + } + + var totalBitrate = (state.OutputAudioBitrate ?? 0) + (state.OutputVideoBitrate ?? 0); + + var builder = new StringBuilder(); + + builder.AppendLine("#EXTM3U"); + + var isLiveStream = state.IsSegmentedLiveStream; + + var queryString = _httpContextAccessor.HttpContext.Request.QueryString.ToString(); + + // from universal audio service + if (!string.IsNullOrWhiteSpace(state.Request.SegmentContainer) + && !queryString.Contains("SegmentContainer", StringComparison.OrdinalIgnoreCase)) + { + queryString += "&SegmentContainer=" + state.Request.SegmentContainer; + } + + // from universal audio service + if (!string.IsNullOrWhiteSpace(state.Request.TranscodeReasons) + && !queryString.Contains("TranscodeReasons=", StringComparison.OrdinalIgnoreCase)) + { + queryString += "&TranscodeReasons=" + state.Request.TranscodeReasons; + } + + // Main stream + var playlistUrl = isLiveStream ? "live.m3u8" : "main.m3u8"; + + playlistUrl += queryString; + + var subtitleStreams = state.MediaSource + .MediaStreams + .Where(i => i.IsTextSubtitleStream) + .ToList(); + + var subtitleGroup = subtitleStreams.Count > 0 && (state.SubtitleDeliveryMethod == 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.SubtitleDeliveryMethod == SubtitleDeliveryMethod.Encode) + { + subtitleGroup = null; + } + + if (!string.IsNullOrWhiteSpace(subtitleGroup)) + { + AddSubtitles(state, subtitleStreams, builder, _httpContextAccessor.HttpContext.User); + } + + var basicPlaylist = AppendPlaylist(builder, state, playlistUrl, totalBitrate, subtitleGroup); + + if (state.VideoStream != null && state.VideoRequest != null) + { + // Provide SDR HEVC entrance for backward compatibility. + if (EncodingHelper.IsCopyCodec(state.OutputVideoCodec) + && !string.IsNullOrEmpty(state.VideoStream.VideoRange) + && string.Equals(state.VideoStream.VideoRange, "HDR", StringComparison.OrdinalIgnoreCase) + && string.Equals(state.ActualOutputVideoCodec, "hevc", StringComparison.OrdinalIgnoreCase)) + { + var requestedVideoProfiles = state.GetRequestedProfiles("hevc"); + if (requestedVideoProfiles != null && requestedVideoProfiles.Length > 0) + { + // Force HEVC Main Profile and disable video stream copy. + state.OutputVideoCodec = "hevc"; + var sdrVideoUrl = ReplaceProfile(playlistUrl, "hevc", string.Join(',', requestedVideoProfiles), "main"); + sdrVideoUrl += "&AllowVideoStreamCopy=false"; + + var sdrOutputVideoBitrate = _encodingHelper.GetVideoBitrateParamValue(state.VideoRequest, state.VideoStream, state.OutputVideoCodec) ?? 0; + var sdrOutputAudioBitrate = _encodingHelper.GetAudioBitrateParam(state.VideoRequest, state.AudioStream) ?? 0; + var sdrTotalBitrate = sdrOutputAudioBitrate + sdrOutputVideoBitrate; + + AppendPlaylist(builder, state, sdrVideoUrl, sdrTotalBitrate, subtitleGroup); + + // Restore the video codec + state.OutputVideoCodec = "copy"; + } + } + + // Provide Level 5.0 entrance for backward compatibility. + // e.g. Apple A10 chips refuse the master playlist containing SDR HEVC Main Level 5.1 video, + // but in fact it is capable of playing videos up to Level 6.1. + if (EncodingHelper.IsCopyCodec(state.OutputVideoCodec) + && state.VideoStream.Level.HasValue + && state.VideoStream.Level > 150 + && !string.IsNullOrEmpty(state.VideoStream.VideoRange) + && string.Equals(state.VideoStream.VideoRange, "SDR", StringComparison.OrdinalIgnoreCase) + && string.Equals(state.ActualOutputVideoCodec, "hevc", StringComparison.OrdinalIgnoreCase)) + { + var playlistCodecsField = new StringBuilder(); + AppendPlaylistCodecsField(playlistCodecsField, state); + + // Force the video level to 5.0. + var originalLevel = state.VideoStream.Level; + state.VideoStream.Level = 150; + var newPlaylistCodecsField = new StringBuilder(); + AppendPlaylistCodecsField(newPlaylistCodecsField, state); + + // Restore the video level. + state.VideoStream.Level = originalLevel; + var newPlaylist = ReplacePlaylistCodecsField(basicPlaylist, playlistCodecsField, newPlaylistCodecsField); + builder.Append(newPlaylist); + } + } + + if (EnableAdaptiveBitrateStreaming(state, isLiveStream, enableAdaptiveBitrateStreaming, _httpContextAccessor.HttpContext.GetNormalizedRemoteIp())) + { + 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 = ReplaceVideoBitrate(playlistUrl, requestedVideoBitrate, requestedVideoBitrate - variation); + AppendPlaylist(builder, state, variantUrl, newBitrate, subtitleGroup); + + variation *= 2; + newBitrate = totalBitrate - variation; + variantUrl = ReplaceVideoBitrate(playlistUrl, requestedVideoBitrate, requestedVideoBitrate - variation); + AppendPlaylist(builder, state, variantUrl, newBitrate, subtitleGroup); + } + + return new FileContentResult(Encoding.UTF8.GetBytes(builder.ToString()), MimeTypes.GetMimeType("playlist.m3u8")); + } + + private StringBuilder AppendPlaylist(StringBuilder builder, StreamState state, string url, int bitrate, string? subtitleGroup) + { + var playlistBuilder = new StringBuilder(); + playlistBuilder.Append("#EXT-X-STREAM-INF:BANDWIDTH=") + .Append(bitrate.ToString(CultureInfo.InvariantCulture)) + .Append(",AVERAGE-BANDWIDTH=") + .Append(bitrate.ToString(CultureInfo.InvariantCulture)); + + AppendPlaylistVideoRangeField(playlistBuilder, state); + + AppendPlaylistCodecsField(playlistBuilder, state); + + AppendPlaylistResolutionField(playlistBuilder, state); + + AppendPlaylistFramerateField(playlistBuilder, state); + + if (!string.IsNullOrWhiteSpace(subtitleGroup)) + { + playlistBuilder.Append(",SUBTITLES=\"") + .Append(subtitleGroup) + .Append('"'); + } + + playlistBuilder.Append(Environment.NewLine); + playlistBuilder.AppendLine(url); + builder.Append(playlistBuilder); + + return playlistBuilder; + } + + /// <summary> + /// Appends a VIDEO-RANGE field containing the range of the output video stream. + /// </summary> + /// <seealso cref="AppendPlaylist(StringBuilder, StreamState, string, int, string)"/> + /// <param name="builder">StringBuilder to append the field to.</param> + /// <param name="state">StreamState of the current stream.</param> + private void AppendPlaylistVideoRangeField(StringBuilder builder, StreamState state) + { + if (state.VideoStream != null && !string.IsNullOrEmpty(state.VideoStream.VideoRange)) + { + var videoRange = state.VideoStream.VideoRange; + if (EncodingHelper.IsCopyCodec(state.OutputVideoCodec)) + { + if (string.Equals(videoRange, "SDR", StringComparison.OrdinalIgnoreCase)) + { + builder.Append(",VIDEO-RANGE=SDR"); + } + + if (string.Equals(videoRange, "HDR", StringComparison.OrdinalIgnoreCase)) + { + builder.Append(",VIDEO-RANGE=PQ"); + } + } + else + { + // Currently we only encode to SDR. + builder.Append(",VIDEO-RANGE=SDR"); + } + } + } + + /// <summary> + /// Appends a CODECS field containing formatted strings of + /// the active streams output video and audio codecs. + /// </summary> + /// <seealso cref="AppendPlaylist(StringBuilder, StreamState, string, int, string)"/> + /// <seealso cref="GetPlaylistVideoCodecs(StreamState, string, int)"/> + /// <seealso cref="GetPlaylistAudioCodecs(StreamState)"/> + /// <param name="builder">StringBuilder to append the field to.</param> + /// <param name="state">StreamState of the current stream.</param> + private void AppendPlaylistCodecsField(StringBuilder builder, StreamState state) + { + // Video + string videoCodecs = string.Empty; + int? videoCodecLevel = GetOutputVideoCodecLevel(state); + if (!string.IsNullOrEmpty(state.ActualOutputVideoCodec) && videoCodecLevel.HasValue) + { + videoCodecs = GetPlaylistVideoCodecs(state, state.ActualOutputVideoCodec, videoCodecLevel.Value); + } + + // Audio + string audioCodecs = string.Empty; + if (!string.IsNullOrEmpty(state.ActualOutputAudioCodec)) + { + audioCodecs = GetPlaylistAudioCodecs(state); + } + + StringBuilder codecs = new StringBuilder(); + + codecs.Append(videoCodecs); + + if (!string.IsNullOrEmpty(videoCodecs) && !string.IsNullOrEmpty(audioCodecs)) + { + codecs.Append(','); + } + + codecs.Append(audioCodecs); + + if (codecs.Length > 1) + { + builder.Append(",CODECS=\"") + .Append(codecs) + .Append('"'); + } + } + + /// <summary> + /// Appends a RESOLUTION field containing the resolution of the output stream. + /// </summary> + /// <seealso cref="AppendPlaylist(StringBuilder, StreamState, string, int, string)"/> + /// <param name="builder">StringBuilder to append the field to.</param> + /// <param name="state">StreamState of the current stream.</param> + private void AppendPlaylistResolutionField(StringBuilder builder, StreamState state) + { + if (state.OutputWidth.HasValue && state.OutputHeight.HasValue) + { + builder.Append(",RESOLUTION=") + .Append(state.OutputWidth.GetValueOrDefault()) + .Append('x') + .Append(state.OutputHeight.GetValueOrDefault()); + } + } + + /// <summary> + /// Appends a FRAME-RATE field containing the framerate of the output stream. + /// </summary> + /// <seealso cref="AppendPlaylist(StringBuilder, StreamState, string, int, string)"/> + /// <param name="builder">StringBuilder to append the field to.</param> + /// <param name="state">StreamState of the current stream.</param> + private void AppendPlaylistFramerateField(StringBuilder builder, StreamState state) + { + double? framerate = null; + if (state.TargetFramerate.HasValue) + { + framerate = Math.Round(state.TargetFramerate.GetValueOrDefault(), 3); + } + else if (state.VideoStream?.RealFrameRate != null) + { + framerate = Math.Round(state.VideoStream.RealFrameRate.GetValueOrDefault(), 3); + } + + if (framerate.HasValue) + { + builder.Append(",FRAME-RATE=") + .Append(framerate.Value.ToString(CultureInfo.InvariantCulture)); + } + } + + private bool EnableAdaptiveBitrateStreaming(StreamState state, bool isLiveStream, bool enableAdaptiveBitrateStreaming, IPAddress ipAddress) + { + // Within the local network this will likely do more harm than good. + if (_networkManager.IsInLocalNetwork(ipAddress)) + { + return false; + } + + if (!enableAdaptiveBitrateStreaming) + { + return false; + } + + if (isLiveStream || string.IsNullOrWhiteSpace(state.MediaPath)) + { + // Opening live streams is so slow it's not even worth it + return false; + } + + if (EncodingHelper.IsCopyCodec(state.OutputVideoCodec)) + { + return false; + } + + if (EncodingHelper.IsCopyCodec(state.OutputAudioCodec)) + { + return false; + } + + if (!state.IsOutputVideo) + { + return false; + } + + // Having problems in android + return false; + // return state.VideoRequest.VideoBitRate.HasValue; + } + + private void AddSubtitles(StreamState state, IEnumerable<MediaStream> subtitles, StringBuilder builder, ClaimsPrincipal user) + { + var selectedIndex = state.SubtitleStream == null || state.SubtitleDeliveryMethod != SubtitleDeliveryMethod.Hls ? (int?)null : state.SubtitleStream.Index; + const string Format = "#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID=\"subs\",NAME=\"{0}\",DEFAULT={1},FORCED={2},AUTOSELECT=YES,URI=\"{3}\",LANGUAGE=\"{4}\""; + + foreach (var stream in subtitles) + { + var name = stream.DisplayTitle; + + var isDefault = selectedIndex.HasValue && selectedIndex.Value == stream.Index; + var isForced = stream.IsForced; + + var url = string.Format( + CultureInfo.InvariantCulture, + "{0}/Subtitles/{1}/subtitles.m3u8?SegmentLength={2}&api_key={3}", + state.Request.MediaSourceId, + stream.Index.ToString(CultureInfo.InvariantCulture), + 30.ToString(CultureInfo.InvariantCulture), + ClaimHelpers.GetToken(user)); + + var line = string.Format( + CultureInfo.InvariantCulture, + Format, + name, + isDefault ? "YES" : "NO", + isForced ? "YES" : "NO", + url, + stream.Language ?? "Unknown"); + + builder.AppendLine(line); + } + } + + /// <summary> + /// Get the H.26X level of the output video stream. + /// </summary> + /// <param name="state">StreamState of the current stream.</param> + /// <returns>H.26X level of the output video stream.</returns> + private int? GetOutputVideoCodecLevel(StreamState state) + { + string levelString = string.Empty; + if (EncodingHelper.IsCopyCodec(state.OutputVideoCodec) + && state.VideoStream != null + && state.VideoStream.Level.HasValue) + { + levelString = state.VideoStream.Level.ToString() ?? string.Empty; + } + else + { + if (string.Equals(state.ActualOutputVideoCodec, "h264", StringComparison.OrdinalIgnoreCase)) + { + levelString = state.GetRequestedLevel(state.ActualOutputVideoCodec) ?? "41"; + levelString = EncodingHelper.NormalizeTranscodingLevel(state, levelString); + } + + if (string.Equals(state.ActualOutputVideoCodec, "h265", StringComparison.OrdinalIgnoreCase) + || string.Equals(state.ActualOutputVideoCodec, "hevc", StringComparison.OrdinalIgnoreCase)) + { + levelString = state.GetRequestedLevel("h265") ?? state.GetRequestedLevel("hevc") ?? "120"; + levelString = EncodingHelper.NormalizeTranscodingLevel(state, levelString); + } + } + + if (int.TryParse(levelString, NumberStyles.Integer, CultureInfo.InvariantCulture, out var parsedLevel)) + { + return parsedLevel; + } + + return null; + } + + /// <summary> + /// Get the H.26X profile of the output video stream. + /// </summary> + /// <param name="state">StreamState of the current stream.</param> + /// <param name="codec">Video codec.</param> + /// <returns>H.26X profile of the output video stream.</returns> + private string GetOutputVideoCodecProfile(StreamState state, string codec) + { + string profileString = string.Empty; + if (EncodingHelper.IsCopyCodec(state.OutputVideoCodec) + && !string.IsNullOrEmpty(state.VideoStream.Profile)) + { + profileString = state.VideoStream.Profile; + } + else if (!string.IsNullOrEmpty(codec)) + { + profileString = state.GetRequestedProfiles(codec).FirstOrDefault() ?? string.Empty; + if (string.Equals(state.ActualOutputVideoCodec, "h264", StringComparison.OrdinalIgnoreCase)) + { + profileString ??= "high"; + } + + if (string.Equals(state.ActualOutputVideoCodec, "h265", StringComparison.OrdinalIgnoreCase) + || string.Equals(state.ActualOutputVideoCodec, "hevc", StringComparison.OrdinalIgnoreCase)) + { + profileString ??= "main"; + } + } + + return profileString; + } + + /// <summary> + /// Gets a formatted string of the output audio codec, for use in the CODECS field. + /// </summary> + /// <seealso cref="AppendPlaylistCodecsField(StringBuilder, StreamState)"/> + /// <seealso cref="GetPlaylistVideoCodecs(StreamState, string, int)"/> + /// <param name="state">StreamState of the current stream.</param> + /// <returns>Formatted audio codec string.</returns> + private string GetPlaylistAudioCodecs(StreamState state) + { + if (string.Equals(state.ActualOutputAudioCodec, "aac", StringComparison.OrdinalIgnoreCase)) + { + string? profile = state.GetRequestedProfiles("aac").FirstOrDefault(); + return HlsCodecStringHelpers.GetAACString(profile); + } + + if (string.Equals(state.ActualOutputAudioCodec, "mp3", StringComparison.OrdinalIgnoreCase)) + { + return HlsCodecStringHelpers.GetMP3String(); + } + + if (string.Equals(state.ActualOutputAudioCodec, "ac3", StringComparison.OrdinalIgnoreCase)) + { + return HlsCodecStringHelpers.GetAC3String(); + } + + if (string.Equals(state.ActualOutputAudioCodec, "eac3", StringComparison.OrdinalIgnoreCase)) + { + return HlsCodecStringHelpers.GetEAC3String(); + } + + if (string.Equals(state.ActualOutputAudioCodec, "flac", StringComparison.OrdinalIgnoreCase)) + { + return HlsCodecStringHelpers.GetFLACString(); + } + + if (string.Equals(state.ActualOutputAudioCodec, "alac", StringComparison.OrdinalIgnoreCase)) + { + return HlsCodecStringHelpers.GetALACString(); + } + + return string.Empty; + } + + /// <summary> + /// Gets a formatted string of the output video codec, for use in the CODECS field. + /// </summary> + /// <seealso cref="AppendPlaylistCodecsField(StringBuilder, StreamState)"/> + /// <seealso cref="GetPlaylistAudioCodecs(StreamState)"/> + /// <param name="state">StreamState of the current stream.</param> + /// <param name="codec">Video codec.</param> + /// <param name="level">Video level.</param> + /// <returns>Formatted video codec string.</returns> + private string GetPlaylistVideoCodecs(StreamState state, string codec, int level) + { + if (level == 0) + { + // This is 0 when there's no requested H.26X level in the device profile + // and the source is not encoded in H.26X + _logger.LogError("Got invalid H.26X level when building CODECS field for HLS master playlist"); + return string.Empty; + } + + if (string.Equals(codec, "h264", StringComparison.OrdinalIgnoreCase)) + { + string profile = GetOutputVideoCodecProfile(state, "h264"); + return HlsCodecStringHelpers.GetH264String(profile, level); + } + + if (string.Equals(codec, "h265", StringComparison.OrdinalIgnoreCase) + || string.Equals(codec, "hevc", StringComparison.OrdinalIgnoreCase)) + { + string profile = GetOutputVideoCodecProfile(state, "hevc"); + return HlsCodecStringHelpers.GetH265String(profile, level); + } + + return string.Empty; + } + + 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 string ReplaceVideoBitrate(string url, int oldValue, int newValue) + { + return url.Replace( + "videobitrate=" + oldValue.ToString(CultureInfo.InvariantCulture), + "videobitrate=" + newValue.ToString(CultureInfo.InvariantCulture), + StringComparison.OrdinalIgnoreCase); + } + + private string ReplaceProfile(string url, string codec, string oldValue, string newValue) + { + string profileStr = codec + "-profile="; + return url.Replace( + profileStr + oldValue, + profileStr + newValue, + StringComparison.OrdinalIgnoreCase); + } + + private string ReplacePlaylistCodecsField(StringBuilder playlist, StringBuilder oldValue, StringBuilder newValue) + { + var oldPlaylist = playlist.ToString(); + return oldPlaylist.Replace( + oldValue.ToString(), + newValue.ToString(), + StringComparison.OrdinalIgnoreCase); + } + } +} |