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jellyfin/MediaBrowser.Api/Streaming/VideoHandler.cs

180 lines
5.8 KiB

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