jellyfin/Jellyfin.Api/Helpers/DynamicHlsHelper.cs
2020-11-08 01:39:32 +08:00

711 lines
31 KiB
C#

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.IO;
using MediaBrowser.Model.Net;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
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 IFileSystem _fileSystem;
private readonly ISubtitleEncoder _subtitleEncoder;
private readonly IConfiguration _configuration;
private readonly IDeviceManager _deviceManager;
private readonly TranscodingJobHelper _transcodingJobHelper;
private readonly INetworkManager _networkManager;
private readonly ILogger<DynamicHlsHelper> _logger;
private readonly IHttpContextAccessor _httpContextAccessor;
/// <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="fileSystem">Instance of the <see cref="IFileSystem"/> interface.</param>
/// <param name="subtitleEncoder">Instance of the <see cref="ISubtitleEncoder"/> interface.</param>
/// <param name="configuration">Instance of the <see cref="IConfiguration"/> 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>
public DynamicHlsHelper(
ILibraryManager libraryManager,
IUserManager userManager,
IDlnaManager dlnaManager,
IAuthorizationContext authContext,
IMediaSourceManager mediaSourceManager,
IServerConfigurationManager serverConfigurationManager,
IMediaEncoder mediaEncoder,
IFileSystem fileSystem,
ISubtitleEncoder subtitleEncoder,
IConfiguration configuration,
IDeviceManager deviceManager,
TranscodingJobHelper transcodingJobHelper,
INetworkManager networkManager,
ILogger<DynamicHlsHelper> logger,
IHttpContextAccessor httpContextAccessor)
{
_libraryManager = libraryManager;
_userManager = userManager;
_dlnaManager = dlnaManager;
_authContext = authContext;
_mediaSourceManager = mediaSourceManager;
_serverConfigurationManager = serverConfigurationManager;
_mediaEncoder = mediaEncoder;
_fileSystem = fileSystem;
_subtitleEncoder = subtitleEncoder;
_configuration = configuration;
_deviceManager = deviceManager;
_transcodingJobHelper = transcodingJobHelper;
_networkManager = networkManager;
_logger = logger;
_httpContextAccessor = httpContextAccessor;
}
/// <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;
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)
{
using var state = await StreamingHelpers.GetStreamingState(
streamingRequest,
_httpContextAccessor.HttpContext.Request,
_authContext,
_mediaSourceManager,
_userManager,
_libraryManager,
_serverConfigurationManager,
_mediaEncoder,
_fileSystem,
_subtitleEncoder,
_configuration,
_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 (queryString.IndexOf("SegmentContainer", StringComparison.OrdinalIgnoreCase) == -1 && !string.IsNullOrWhiteSpace(state.Request.SegmentContainer))
{
queryString += "&SegmentContainer=" + state.Request.SegmentContainer;
}
// from universal audio service
if (!string.IsNullOrWhiteSpace(state.Request.TranscodeReasons) && queryString.IndexOf("TranscodeReasons=", StringComparison.OrdinalIgnoreCase) == -1)
{
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";
EncodingHelper encodingHelper = new EncodingHelper(_mediaEncoder, _fileSystem, _subtitleEncoder, _configuration);
var sdrOutputVideoBitrate = encodingHelper.GetVideoBitrateParamValue(state.VideoRequest, state.VideoStream, state.OutputVideoCodec) ?? 0;
var sdrOutputAudioBitrate = encodingHelper.GetAudioBitrateParam(state.VideoRequest.AudioBitRate, 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);
}
}
private bool EnableAdaptiveBitrateStreaming(StreamState state, bool isLiveStream, bool enableAdaptiveBitrateStreaming, string 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();
}
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();
if (string.Equals(state.ActualOutputVideoCodec, "h264", StringComparison.OrdinalIgnoreCase))
{
profileString = profileString ?? "high";
}
if (string.Equals(state.ActualOutputVideoCodec, "h265", StringComparison.OrdinalIgnoreCase)
|| string.Equals(state.ActualOutputVideoCodec, "hevc", StringComparison.OrdinalIgnoreCase))
{
profileString = 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)
{
return url.Replace(
codec + "-profile=" + oldValue.ToString(),
codec + "-profile=" + newValue.ToString(),
StringComparison.OrdinalIgnoreCase);
}
private string ReplacePlaylistCodecsField(StringBuilder playlist, StringBuilder oldValue, StringBuilder newValue)
{
var oldPlaylist = playlist.ToString();
return oldPlaylist.Replace(
oldValue.ToString(),
newValue.ToString(),
StringComparison.OrdinalIgnoreCase);
}
}
}