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185 lines
6 KiB
C#
185 lines
6 KiB
C#
using System.IO;
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using System.Threading;
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using MediaBrowser.Common.IO;
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using MediaBrowser.Common.Net.Handlers;
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using MediaBrowser.Controller.Entities;
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using MediaBrowser.Controller.Resolvers;
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using System;
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using System.ComponentModel.Composition;
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using System.Linq;
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using System.Net;
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using MediaBrowser.Model.Entities;
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namespace MediaBrowser.Api.Streaming
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{
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/// <summary>
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/// Providers a progressive streaming video api
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/// </summary>
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[Export(typeof(IHttpServerHandler))]
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class VideoHandler : BaseProgressiveStreamingHandler<Video>
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{
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/// <summary>
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/// Handleses the request.
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/// </summary>
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/// <param name="request">The request.</param>
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/// <returns><c>true</c> if XXXX, <c>false</c> otherwise</returns>
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public override bool HandlesRequest(HttpListenerRequest request)
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{
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return EntityResolutionHelper.VideoFileExtensions.Any(a => ApiService.IsApiUrlMatch("video" + a, request));
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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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/// <param name="outputPath">The output path.</param>
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/// <param name="isoMount">The iso mount.</param>
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/// <returns>System.String.</returns>
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protected override string GetCommandLineArguments(string outputPath, IIsoMount isoMount)
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{
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var probeSize = Kernel.FFMpegManager.GetProbeSizeArgument(LibraryItem.VideoType, LibraryItem.IsoType);
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// Get the output codec name
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var videoCodec = GetVideoCodec();
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var graphicalSubtitleParam = string.Empty;
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if (SubtitleStream != null)
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{
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// This is for internal graphical subs
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if (!SubtitleStream.IsExternal && (SubtitleStream.Codec.IndexOf("pgs", StringComparison.OrdinalIgnoreCase) != -1 || SubtitleStream.Codec.IndexOf("dvd", StringComparison.OrdinalIgnoreCase) != -1))
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{
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graphicalSubtitleParam = GetInternalGraphicalSubtitleParam(SubtitleStream, videoCodec);
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}
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}
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return string.Format("{0} {1} -i {2}{3} -threads 0 {4} {5}{6} {7} \"{8}\"",
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probeSize,
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FastSeekCommandLineParameter,
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GetInputArgument(isoMount),
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SlowSeekCommandLineParameter,
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MapArgs,
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GetVideoArguments(videoCodec),
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graphicalSubtitleParam,
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GetAudioArguments(),
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outputPath
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).Trim();
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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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/// <returns>System.String.</returns>
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private string GetVideoArguments(string videoCodec)
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{
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var args = "-vcodec " + videoCodec;
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// If we're encoding video, add additional params
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if (!videoCodec.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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args += GetOutputSizeParam(videoCodec);
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}
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if (FrameRate.HasValue)
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{
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args += string.Format(" -r {0}", FrameRate.Value);
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}
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// Add the audio bitrate
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var qualityParam = GetVideoQualityParam(videoCodec);
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if (!string.IsNullOrEmpty(qualityParam))
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{
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args += " " + qualityParam;
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}
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}
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else if (IsH264(VideoStream))
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{
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args += " -bsf h264_mp4toannexb";
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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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/// <returns>System.String.</returns>
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private string GetAudioArguments()
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{
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// If the video doesn't have an audio stream, return a default.
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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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var codec = GetAudioCodec();
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var 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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var channels = GetNumAudioChannelsParam();
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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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var sampleRate = GetSampleRateParam();
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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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if (AudioBitRate.HasValue)
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{
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args += " -ab " + AudioBitRate.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 video bitrate to specify on the command line
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/// </summary>
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/// <param name="videoCodec">The video codec.</param>
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/// <returns>System.String.</returns>
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private string GetVideoQualityParam(string videoCodec)
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{
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var args = string.Empty;
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// webm
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if (videoCodec.Equals("libvpx", StringComparison.OrdinalIgnoreCase))
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{
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args = "-g 120 -cpu-used 1 -lag-in-frames 16 -deadline realtime -slices 4 -vprofile 0";
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}
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// asf/wmv
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else if (videoCodec.Equals("wmv2", StringComparison.OrdinalIgnoreCase))
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{
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args = "-g 100 -qmax 15";
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}
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else if (videoCodec.Equals("libx264", StringComparison.OrdinalIgnoreCase))
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{
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args = "-preset superfast";
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}
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if (VideoBitRate.HasValue)
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{
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args += " -b:v " + VideoBitRate;
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}
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return args.Trim();
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}
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}
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}
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