jellyfin/MediaBrowser.Server.Implementations/LiveTv/TunerHosts/BaseTunerHost.cs
2016-09-18 16:38:38 -04:00

396 lines
15 KiB
C#

using MediaBrowser.Common.Configuration;
using MediaBrowser.Controller.LiveTv;
using MediaBrowser.Model.Dto;
using MediaBrowser.Model.LiveTv;
using MediaBrowser.Model.Logging;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Controller.MediaEncoding;
using MediaBrowser.Model.Dlna;
using MediaBrowser.Model.Serialization;
namespace MediaBrowser.Server.Implementations.LiveTv.TunerHosts
{
public abstract class BaseTunerHost
{
protected readonly IConfigurationManager Config;
protected readonly ILogger Logger;
protected IJsonSerializer JsonSerializer;
protected readonly IMediaEncoder MediaEncoder;
private readonly ConcurrentDictionary<string, ChannelCache> _channelCache =
new ConcurrentDictionary<string, ChannelCache>(StringComparer.OrdinalIgnoreCase);
protected BaseTunerHost(IConfigurationManager config, ILogger logger, IJsonSerializer jsonSerializer, IMediaEncoder mediaEncoder)
{
Config = config;
Logger = logger;
JsonSerializer = jsonSerializer;
MediaEncoder = mediaEncoder;
}
protected abstract Task<IEnumerable<ChannelInfo>> GetChannelsInternal(TunerHostInfo tuner, CancellationToken cancellationToken);
public abstract string Type { get; }
public async Task<IEnumerable<ChannelInfo>> GetChannels(TunerHostInfo tuner, bool enableCache, CancellationToken cancellationToken)
{
ChannelCache cache = null;
var key = tuner.Id;
if (enableCache && !string.IsNullOrWhiteSpace(key) && _channelCache.TryGetValue(key, out cache))
{
if (DateTime.UtcNow - cache.Date < TimeSpan.FromMinutes(60))
{
return cache.Channels.ToList();
}
}
var result = await GetChannelsInternal(tuner, cancellationToken).ConfigureAwait(false);
var list = result.ToList();
Logger.Debug("Channels from {0}: {1}", tuner.Url, JsonSerializer.SerializeToString(list));
if (!string.IsNullOrWhiteSpace(key) && list.Count > 0)
{
cache = cache ?? new ChannelCache();
cache.Date = DateTime.UtcNow;
cache.Channels = list;
_channelCache.AddOrUpdate(key, cache, (k, v) => cache);
}
return list;
}
protected virtual List<TunerHostInfo> GetTunerHosts()
{
return GetConfiguration().TunerHosts
.Where(i => i.IsEnabled && string.Equals(i.Type, Type, StringComparison.OrdinalIgnoreCase))
.ToList();
}
public async Task<IEnumerable<ChannelInfo>> GetChannels(CancellationToken cancellationToken)
{
var list = new List<ChannelInfo>();
var hosts = GetTunerHosts();
foreach (var host in hosts)
{
try
{
var channels = await GetChannels(host, true, cancellationToken).ConfigureAwait(false);
var newChannels = channels.Where(i => !list.Any(l => string.Equals(i.Id, l.Id, StringComparison.OrdinalIgnoreCase))).ToList();
list.AddRange(newChannels);
}
catch (Exception ex)
{
Logger.ErrorException("Error getting channel list", ex);
}
}
return list;
}
protected abstract Task<List<MediaSourceInfo>> GetChannelStreamMediaSources(TunerHostInfo tuner, string channelId, CancellationToken cancellationToken);
public async Task<List<MediaSourceInfo>> GetChannelStreamMediaSources(string channelId, CancellationToken cancellationToken)
{
if (IsValidChannelId(channelId))
{
var hosts = GetTunerHosts();
var hostsWithChannel = new List<TunerHostInfo>();
foreach (var host in hosts)
{
try
{
var channels = await GetChannels(host, true, cancellationToken).ConfigureAwait(false);
if (channels.Any(i => string.Equals(i.Id, channelId, StringComparison.OrdinalIgnoreCase)))
{
hostsWithChannel.Add(host);
}
}
catch (Exception ex)
{
Logger.Error("Error getting channels", ex);
}
}
foreach (var host in hostsWithChannel)
{
var resourcePool = GetLock(host.Url);
Logger.Debug("GetChannelStreamMediaSources - Waiting on tuner resource pool");
await resourcePool.WaitAsync(cancellationToken).ConfigureAwait(false);
Logger.Debug("GetChannelStreamMediaSources - Unlocked resource pool");
try
{
// Check to make sure the tuner is available
// If there's only one tuner, don't bother with the check and just let the tuner be the one to throw an error
if (hostsWithChannel.Count > 1 &&
!await IsAvailable(host, channelId, cancellationToken).ConfigureAwait(false))
{
Logger.Error("Tuner is not currently available");
continue;
}
var mediaSources = await GetChannelStreamMediaSources(host, channelId, cancellationToken).ConfigureAwait(false);
// Prefix the id with the host Id so that we can easily find it
foreach (var mediaSource in mediaSources)
{
mediaSource.Id = host.Id + mediaSource.Id;
}
return mediaSources;
}
catch (Exception ex)
{
Logger.Error("Error opening tuner", ex);
}
finally
{
resourcePool.Release();
}
}
}
return new List<MediaSourceInfo>();
}
protected abstract Task<MediaSourceInfo> GetChannelStream(TunerHostInfo tuner, string channelId, string streamId, CancellationToken cancellationToken);
public async Task<Tuple<MediaSourceInfo, SemaphoreSlim>> GetChannelStream(string channelId, string streamId, CancellationToken cancellationToken)
{
if (IsValidChannelId(channelId))
{
var hosts = GetTunerHosts();
var hostsWithChannel = new List<TunerHostInfo>();
foreach (var host in hosts)
{
if (string.IsNullOrWhiteSpace(streamId))
{
try
{
var channels = await GetChannels(host, true, cancellationToken).ConfigureAwait(false);
if (channels.Any(i => string.Equals(i.Id, channelId, StringComparison.OrdinalIgnoreCase)))
{
hostsWithChannel.Add(host);
}
}
catch (Exception ex)
{
Logger.Error("Error getting channels", ex);
}
}
else if (streamId.StartsWith(host.Id, StringComparison.OrdinalIgnoreCase))
{
hostsWithChannel = new List<TunerHostInfo> {host};
streamId = streamId.Substring(host.Id.Length);
break;
}
}
foreach (var host in hostsWithChannel)
{
var resourcePool = GetLock(host.Url);
Logger.Debug("GetChannelStream - Waiting on tuner resource pool");
await resourcePool.WaitAsync(cancellationToken).ConfigureAwait(false);
Logger.Debug("GetChannelStream - Unlocked resource pool");
try
{
// Check to make sure the tuner is available
// If there's only one tuner, don't bother with the check and just let the tuner be the one to throw an error
// If a streamId is specified then availibility has already been checked in GetChannelStreamMediaSources
if (string.IsNullOrWhiteSpace(streamId) && hostsWithChannel.Count > 1)
{
if (!await IsAvailable(host, channelId, cancellationToken).ConfigureAwait(false))
{
Logger.Error("Tuner is not currently available");
resourcePool.Release();
continue;
}
}
var stream = await GetChannelStream(host, channelId, streamId, cancellationToken).ConfigureAwait(false);
if (EnableMediaProbing)
{
await AddMediaInfo(stream, false, resourcePool, cancellationToken).ConfigureAwait(false);
}
return new Tuple<MediaSourceInfo, SemaphoreSlim>(stream, resourcePool);
}
catch (Exception ex)
{
Logger.Error("Error opening tuner", ex);
resourcePool.Release();
}
}
}
else
{
throw new FileNotFoundException();
}
throw new LiveTvConflictException();
}
protected virtual bool EnableMediaProbing
{
get { return false; }
}
protected async Task<bool> IsAvailable(TunerHostInfo tuner, string channelId, CancellationToken cancellationToken)
{
try
{
return await IsAvailableInternal(tuner, channelId, cancellationToken).ConfigureAwait(false);
}
catch (Exception ex)
{
Logger.ErrorException("Error checking tuner availability", ex);
return false;
}
}
protected abstract Task<bool> IsAvailableInternal(TunerHostInfo tuner, string channelId, CancellationToken cancellationToken);
/// <summary>
/// The _semaphoreLocks
/// </summary>
private readonly ConcurrentDictionary<string, SemaphoreSlim> _semaphoreLocks = new ConcurrentDictionary<string, SemaphoreSlim>(StringComparer.OrdinalIgnoreCase);
/// <summary>
/// Gets the lock.
/// </summary>
/// <param name="url">The filename.</param>
/// <returns>System.Object.</returns>
private SemaphoreSlim GetLock(string url)
{
return _semaphoreLocks.GetOrAdd(url, key => new SemaphoreSlim(1, 1));
}
private async Task AddMediaInfo(MediaSourceInfo mediaSource, bool isAudio, SemaphoreSlim resourcePool, CancellationToken cancellationToken)
{
await resourcePool.WaitAsync(cancellationToken).ConfigureAwait(false);
try
{
await AddMediaInfoInternal(mediaSource, isAudio, cancellationToken).ConfigureAwait(false);
// Leave the resource locked. it will be released upstream
}
catch (Exception)
{
// Release the resource if there's some kind of failure.
resourcePool.Release();
throw;
}
}
private async Task AddMediaInfoInternal(MediaSourceInfo mediaSource, bool isAudio, CancellationToken cancellationToken)
{
var originalRuntime = mediaSource.RunTimeTicks;
var info = await MediaEncoder.GetMediaInfo(new MediaInfoRequest
{
InputPath = mediaSource.Path,
Protocol = mediaSource.Protocol,
MediaType = isAudio ? DlnaProfileType.Audio : DlnaProfileType.Video,
ExtractChapters = false
}, cancellationToken).ConfigureAwait(false);
mediaSource.Bitrate = info.Bitrate;
mediaSource.Container = info.Container;
mediaSource.Formats = info.Formats;
mediaSource.MediaStreams = info.MediaStreams;
mediaSource.RunTimeTicks = info.RunTimeTicks;
mediaSource.Size = info.Size;
mediaSource.Timestamp = info.Timestamp;
mediaSource.Video3DFormat = info.Video3DFormat;
mediaSource.VideoType = info.VideoType;
mediaSource.DefaultSubtitleStreamIndex = null;
// Null this out so that it will be treated like a live stream
if (!originalRuntime.HasValue)
{
mediaSource.RunTimeTicks = null;
}
var audioStream = mediaSource.MediaStreams.FirstOrDefault(i => i.Type == Model.Entities.MediaStreamType.Audio);
if (audioStream == null || audioStream.Index == -1)
{
mediaSource.DefaultAudioStreamIndex = null;
}
else
{
mediaSource.DefaultAudioStreamIndex = audioStream.Index;
}
var videoStream = mediaSource.MediaStreams.FirstOrDefault(i => i.Type == Model.Entities.MediaStreamType.Video);
if (videoStream != null)
{
if (!videoStream.BitRate.HasValue)
{
var width = videoStream.Width ?? 1920;
if (width >= 1900)
{
videoStream.BitRate = 8000000;
}
else if (width >= 1260)
{
videoStream.BitRate = 3000000;
}
else if (width >= 700)
{
videoStream.BitRate = 1000000;
}
}
}
// Try to estimate this
if (!mediaSource.Bitrate.HasValue)
{
var total = mediaSource.MediaStreams.Select(i => i.BitRate ?? 0).Sum();
if (total > 0)
{
mediaSource.Bitrate = total;
}
}
}
protected abstract bool IsValidChannelId(string channelId);
protected LiveTvOptions GetConfiguration()
{
return Config.GetConfiguration<LiveTvOptions>("livetv");
}
private class ChannelCache
{
public DateTime Date;
public List<ChannelInfo> Channels;
}
}
}