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https://github.com/jellyfin/jellyfin.git
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434 lines
14 KiB
C#
434 lines
14 KiB
C#
using MediaBrowser.Common.Drawing;
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using MediaBrowser.Common.Net.Handlers;
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using MediaBrowser.Controller.Entities;
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using MediaBrowser.Model.DTO;
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using MediaBrowser.Model.Entities;
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using System;
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using System.Collections.Generic;
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using System.ComponentModel.Composition;
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using System.Drawing;
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using System.IO;
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using System.Linq;
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using System.Net;
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namespace MediaBrowser.Api.HttpHandlers
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{
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/// <summary>
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/// Supported output formats: mkv,m4v,mp4,asf,wmv,mov,webm,ogv,3gp,avi,ts,flv
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/// </summary>
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[Export(typeof(BaseHandler))]
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class VideoHandler : BaseMediaHandler<Video, VideoOutputFormats>
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{
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public override bool HandlesRequest(HttpListenerRequest request)
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{
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return ApiService.IsApiUrlMatch("video", request);
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}
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/// <summary>
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/// We can output these files directly, but we can't encode them
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/// </summary>
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protected override IEnumerable<VideoOutputFormats> UnsupportedOutputEncodingFormats
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{
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get
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{
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// mp4, 3gp, mov - muxer does not support non-seekable output
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// avi, mov, mkv, m4v - can't stream these when encoding. the player will try to download them completely before starting playback.
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// wmv - can't seem to figure out the output format name
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return new VideoOutputFormats[] { VideoOutputFormats.Mp4, VideoOutputFormats.ThreeGp, VideoOutputFormats.M4V, VideoOutputFormats.Mkv, VideoOutputFormats.Avi, VideoOutputFormats.Mov, VideoOutputFormats.Wmv };
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}
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}
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/// <summary>
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/// Determines whether or not we can just output the original file directly
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/// </summary>
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protected override bool RequiresConversion()
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{
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string currentFormat = Path.GetExtension(LibraryItem.Path).Replace(".", string.Empty);
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// For now we won't allow these to pass through.
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// Later we'll add some intelligence to allow it when possible
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if (currentFormat.Equals("mp4", StringComparison.OrdinalIgnoreCase) || currentFormat.Equals("mkv", StringComparison.OrdinalIgnoreCase) || currentFormat.Equals("m4v", StringComparison.OrdinalIgnoreCase))
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{
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return true;
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}
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if (base.RequiresConversion())
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{
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return true;
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}
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// See if the video requires conversion
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if (RequiresVideoConversion())
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{
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return true;
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}
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// See if the audio requires conversion
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AudioStream audioStream = (LibraryItem.AudioStreams ?? new List<AudioStream>()).FirstOrDefault();
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if (audioStream != null)
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{
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if (RequiresAudioConversion(audioStream))
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{
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return true;
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}
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}
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// Yay
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return false;
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}
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/// <summary>
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/// Translates the output file extension to the format param that follows "-f" on the ffmpeg command line
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/// </summary>
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private string GetFFMpegOutputFormat(VideoOutputFormats outputFormat)
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{
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if (outputFormat == VideoOutputFormats.Mkv)
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{
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return "matroska";
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}
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if (outputFormat == VideoOutputFormats.Ts)
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{
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return "mpegts";
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}
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if (outputFormat == VideoOutputFormats.Ogv)
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{
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return "ogg";
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}
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return outputFormat.ToString().ToLower();
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}
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/// <summary>
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/// Creates arguments to pass to ffmpeg
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/// </summary>
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protected override string GetCommandLineArguments()
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{
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VideoOutputFormats outputFormat = GetConversionOutputFormat();
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return string.Format("-i \"{0}\" -threads 0 {1} {2} -f {3} -",
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LibraryItem.Path,
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GetVideoArguments(outputFormat),
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GetAudioArguments(outputFormat),
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GetFFMpegOutputFormat(outputFormat)
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);
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}
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/// <summary>
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/// Gets video arguments to pass to ffmpeg
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/// </summary>
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private string GetVideoArguments(VideoOutputFormats outputFormat)
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{
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// Get the output codec name
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string codec = GetVideoCodec(outputFormat);
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string args = "-vcodec " + codec;
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// If we're encoding video, add additional params
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if (!codec.Equals("copy", StringComparison.OrdinalIgnoreCase))
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{
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// Add resolution params, if specified
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if (Width.HasValue || Height.HasValue || MaxHeight.HasValue || MaxWidth.HasValue)
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{
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Size size = DrawingUtils.Resize(LibraryItem.Width, LibraryItem.Height, Width, Height, MaxWidth, MaxHeight);
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args += string.Format(" -s {0}x{1}", size.Width, size.Height);
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}
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}
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return args;
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}
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/// <summary>
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/// Gets audio arguments to pass to ffmpeg
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/// </summary>
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private string GetAudioArguments(VideoOutputFormats outputFormat)
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{
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AudioStream audioStream = (LibraryItem.AudioStreams ?? new List<AudioStream>()).FirstOrDefault();
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// If the video doesn't have an audio stream, return empty
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if (audioStream == null)
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{
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return string.Empty;
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}
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// Get the output codec name
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string codec = GetAudioCodec(audioStream, outputFormat);
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string args = "-acodec " + codec;
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// If we're encoding audio, add additional params
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if (!codec.Equals("copy", StringComparison.OrdinalIgnoreCase))
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{
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// Add the number of audio channels
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int? channels = GetNumAudioChannelsParam(codec, audioStream.Channels);
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if (channels.HasValue)
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{
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args += " -ac " + channels.Value;
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}
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// Add the audio sample rate
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int? sampleRate = GetSampleRateParam(audioStream.SampleRate);
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if (sampleRate.HasValue)
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{
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args += " -ar " + sampleRate.Value;
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}
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}
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return args;
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}
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/// <summary>
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/// Gets the name of the output video codec
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/// </summary>
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private string GetVideoCodec(VideoOutputFormats outputFormat)
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{
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// Some output containers require specific codecs
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if (outputFormat == VideoOutputFormats.Webm)
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{
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// Per webm specification, it must be vpx
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return "libvpx";
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}
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if (outputFormat == VideoOutputFormats.Asf)
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{
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return "wmv2";
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}
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if (outputFormat == VideoOutputFormats.Wmv)
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{
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return "wmv2";
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}
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if (outputFormat == VideoOutputFormats.Ogv)
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{
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return "libtheora";
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}
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// Skip encoding when possible
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if (!RequiresVideoConversion())
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{
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return "copy";
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}
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return "libx264";
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}
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/// <summary>
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/// Gets the name of the output audio codec
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/// </summary>
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private string GetAudioCodec(AudioStream audioStream, VideoOutputFormats outputFormat)
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{
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// Some output containers require specific codecs
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if (outputFormat == VideoOutputFormats.Webm)
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{
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// Per webm specification, it must be vorbis
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return "libvorbis";
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}
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if (outputFormat == VideoOutputFormats.Asf)
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{
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return "wmav2";
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}
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if (outputFormat == VideoOutputFormats.Wmv)
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{
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return "wmav2";
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}
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if (outputFormat == VideoOutputFormats.Ogv)
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{
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return "libvorbis";
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}
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// Skip encoding when possible
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if (!RequiresAudioConversion(audioStream))
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{
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return "copy";
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}
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return "libvo_aacenc";
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}
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/// <summary>
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/// Gets the number of audio channels to specify on the command line
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/// </summary>
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private int? GetNumAudioChannelsParam(string audioCodec, int libraryItemChannels)
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{
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if (libraryItemChannels > 2)
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{
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if (audioCodec.Equals("libvo_aacenc"))
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{
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// libvo_aacenc currently only supports two channel output
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return 2;
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}
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if (audioCodec.Equals("wmav2"))
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{
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// wmav2 currently only supports two channel output
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return 2;
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}
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}
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return GetNumAudioChannelsParam(libraryItemChannels);
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}
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/// <summary>
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/// Determines if the video stream requires encoding
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/// </summary>
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private bool RequiresVideoConversion()
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{
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// Check dimensions
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// If a specific width is required, validate that
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if (Width.HasValue)
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{
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if (Width.Value != LibraryItem.Width)
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{
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return true;
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}
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}
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// If a specific height is required, validate that
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if (Height.HasValue)
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{
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if (Height.Value != LibraryItem.Height)
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{
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return true;
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}
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}
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// If a max width is required, validate that
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if (MaxWidth.HasValue)
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{
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if (MaxWidth.Value < LibraryItem.Width)
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{
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return true;
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}
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}
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// If a max height is required, validate that
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if (MaxHeight.HasValue)
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{
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if (MaxHeight.Value < LibraryItem.Height)
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{
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return true;
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}
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}
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// If the codec is already h264, don't encode
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if (LibraryItem.Codec.IndexOf("264", StringComparison.OrdinalIgnoreCase) != -1 || LibraryItem.Codec.IndexOf("avc", StringComparison.OrdinalIgnoreCase) != -1)
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{
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return false;
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}
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return false;
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}
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/// <summary>
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/// Determines if the audio stream requires encoding
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/// </summary>
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private bool RequiresAudioConversion(AudioStream audio)
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{
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// If the input stream has more audio channels than the client can handle, we need to encode
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if (AudioChannels.HasValue)
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{
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if (audio.Channels > AudioChannels.Value)
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{
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return true;
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}
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}
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// Aac, ac-3 and mp3 are all pretty much universally supported. No need to encode them
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if (audio.Codec.IndexOf("aac", StringComparison.OrdinalIgnoreCase) != -1)
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{
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return false;
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}
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if (audio.Codec.IndexOf("ac-3", StringComparison.OrdinalIgnoreCase) != -1 || audio.Codec.IndexOf("ac3", StringComparison.OrdinalIgnoreCase) != -1)
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{
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return false;
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}
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if (audio.Codec.IndexOf("mpeg", StringComparison.OrdinalIgnoreCase) != -1 || audio.Codec.IndexOf("mp3", StringComparison.OrdinalIgnoreCase) != -1)
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{
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return false;
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}
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return true;
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}
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/// <summary>
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/// Gets the fixed output video height, in pixels
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/// </summary>
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private int? Height
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{
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get
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{
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string val = QueryString["height"];
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if (string.IsNullOrEmpty(val))
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{
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return null;
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}
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return int.Parse(val);
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}
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}
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/// <summary>
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/// Gets the fixed output video width, in pixels
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/// </summary>
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private int? Width
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{
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get
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{
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string val = QueryString["width"];
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if (string.IsNullOrEmpty(val))
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{
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return null;
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}
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return int.Parse(val);
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}
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}
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/// <summary>
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/// Gets the maximum output video height, in pixels
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/// </summary>
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private int? MaxHeight
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{
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get
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{
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string val = QueryString["maxheight"];
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if (string.IsNullOrEmpty(val))
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{
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return null;
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}
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return int.Parse(val);
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}
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}
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/// <summary>
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/// Gets the maximum output video width, in pixels
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/// </summary>
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private int? MaxWidth
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{
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get
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{
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string val = QueryString["maxwidth"];
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if (string.IsNullOrEmpty(val))
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{
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return null;
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}
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return int.Parse(val);
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}
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}
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}
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}
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