jellyfin/MediaBrowser.Controller/MediaEncoding/MediaEncoderHelpers.cs
2014-06-22 12:25:47 -04:00

334 lines
10 KiB
C#

using MediaBrowser.Model.Entities;
using MediaBrowser.Model.IO;
using MediaBrowser.Model.MediaInfo;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
namespace MediaBrowser.Controller.MediaEncoding
{
/// <summary>
/// Class MediaEncoderHelpers
/// </summary>
public static class MediaEncoderHelpers
{
/// <summary>
/// Gets the input argument.
/// </summary>
/// <param name="videoPath">The video path.</param>
/// <param name="protocol">The protocol.</param>
/// <param name="isoMount">The iso mount.</param>
/// <param name="playableStreamFileNames">The playable stream file names.</param>
/// <returns>System.String[][].</returns>
public static string[] GetInputArgument(string videoPath, MediaProtocol protocol, IIsoMount isoMount, List<string> playableStreamFileNames)
{
if (playableStreamFileNames.Count > 0)
{
if (isoMount == null)
{
return GetPlayableStreamFiles(videoPath, playableStreamFileNames).ToArray();
}
return GetPlayableStreamFiles(isoMount.MountedPath, playableStreamFileNames).ToArray();
}
return new[] {videoPath};
}
public static List<string> GetPlayableStreamFiles(string rootPath, IEnumerable<string> filenames)
{
var allFiles = Directory
.EnumerateFiles(rootPath, "*", SearchOption.AllDirectories)
.ToList();
return filenames.Select(name => allFiles.FirstOrDefault(f => string.Equals(Path.GetFileName(f), name, StringComparison.OrdinalIgnoreCase)))
.Where(f => !string.IsNullOrEmpty(f))
.ToList();
}
public static MediaInfo GetMediaInfo(InternalMediaInfoResult data)
{
var internalStreams = data.streams ?? new MediaStreamInfo[] { };
var info = new MediaInfo
{
MediaStreams = internalStreams.Select(s => GetMediaStream(s, data.format))
.Where(i => i != null)
.ToList()
};
if (data.format != null)
{
info.Format = data.format.format_name;
if (!string.IsNullOrEmpty(data.format.bit_rate))
{
info.TotalBitrate = int.Parse(data.format.bit_rate, UsCulture);
}
}
return info;
}
private static readonly CultureInfo UsCulture = new CultureInfo("en-US");
/// <summary>
/// Converts ffprobe stream info to our MediaStream class
/// </summary>
/// <param name="streamInfo">The stream info.</param>
/// <param name="formatInfo">The format info.</param>
/// <returns>MediaStream.</returns>
private static MediaStream GetMediaStream(MediaStreamInfo streamInfo, MediaFormatInfo formatInfo)
{
var stream = new MediaStream
{
Codec = streamInfo.codec_name,
Profile = streamInfo.profile,
Level = streamInfo.level,
Index = streamInfo.index,
PixelFormat = streamInfo.pix_fmt
};
if (streamInfo.tags != null)
{
stream.Language = GetDictionaryValue(streamInfo.tags, "language");
}
if (string.Equals(streamInfo.codec_type, "audio", StringComparison.OrdinalIgnoreCase))
{
stream.Type = MediaStreamType.Audio;
stream.Channels = streamInfo.channels;
if (!string.IsNullOrEmpty(streamInfo.sample_rate))
{
stream.SampleRate = int.Parse(streamInfo.sample_rate, UsCulture);
}
stream.ChannelLayout = ParseChannelLayout(streamInfo.channel_layout);
}
else if (string.Equals(streamInfo.codec_type, "subtitle", StringComparison.OrdinalIgnoreCase))
{
stream.Type = MediaStreamType.Subtitle;
}
else if (string.Equals(streamInfo.codec_type, "video", StringComparison.OrdinalIgnoreCase))
{
stream.Type = (streamInfo.codec_name ?? string.Empty).IndexOf("mjpeg", StringComparison.OrdinalIgnoreCase) != -1
? MediaStreamType.EmbeddedImage
: MediaStreamType.Video;
stream.Width = streamInfo.width;
stream.Height = streamInfo.height;
stream.AspectRatio = GetAspectRatio(streamInfo);
stream.AverageFrameRate = GetFrameRate(streamInfo.avg_frame_rate);
stream.RealFrameRate = GetFrameRate(streamInfo.r_frame_rate);
stream.BitDepth = GetBitDepth(stream.PixelFormat);
stream.IsAnamorphic = string.Equals(streamInfo.sample_aspect_ratio, "0:1",
StringComparison.OrdinalIgnoreCase);
}
else
{
return null;
}
// Get stream bitrate
var bitrate = 0;
if (!string.IsNullOrEmpty(streamInfo.bit_rate))
{
bitrate = int.Parse(streamInfo.bit_rate, UsCulture);
}
else if (formatInfo != null && !string.IsNullOrEmpty(formatInfo.bit_rate) && stream.Type == MediaStreamType.Video)
{
// If the stream info doesn't have a bitrate get the value from the media format info
bitrate = int.Parse(formatInfo.bit_rate, UsCulture);
}
if (bitrate > 0)
{
stream.BitRate = bitrate;
}
if (streamInfo.disposition != null)
{
var isDefault = GetDictionaryValue(streamInfo.disposition, "default");
var isForced = GetDictionaryValue(streamInfo.disposition, "forced");
stream.IsDefault = string.Equals(isDefault, "1", StringComparison.OrdinalIgnoreCase);
stream.IsForced = string.Equals(isForced, "1", StringComparison.OrdinalIgnoreCase);
}
return stream;
}
private static int? GetBitDepth(string pixelFormat)
{
var eightBit = new List<string>
{
"yuv420p",
"yuv411p",
"yuvj420p",
"uyyvyy411",
"nv12",
"nv21",
"rgb444le",
"rgb444be",
"bgr444le",
"bgr444be",
"yuvj411p"
};
if (!string.IsNullOrEmpty(pixelFormat))
{
if (eightBit.Contains(pixelFormat, StringComparer.OrdinalIgnoreCase))
{
return 8;
}
}
return null;
}
/// <summary>
/// Gets a string from an FFProbeResult tags dictionary
/// </summary>
/// <param name="tags">The tags.</param>
/// <param name="key">The key.</param>
/// <returns>System.String.</returns>
private static string GetDictionaryValue(Dictionary<string, string> tags, string key)
{
if (tags == null)
{
return null;
}
string val;
tags.TryGetValue(key, out val);
return val;
}
private static string ParseChannelLayout(string input)
{
if (string.IsNullOrEmpty(input))
{
return input;
}
return input.Split('(').FirstOrDefault();
}
private static string GetAspectRatio(MediaStreamInfo info)
{
var original = info.display_aspect_ratio;
int height;
int width;
var parts = (original ?? string.Empty).Split(':');
if (!(parts.Length == 2 &&
int.TryParse(parts[0], NumberStyles.Any, UsCulture, out width) &&
int.TryParse(parts[1], NumberStyles.Any, UsCulture, out height) &&
width > 0 &&
height > 0))
{
width = info.width;
height = info.height;
}
if (width > 0 && height > 0)
{
double ratio = width;
ratio /= height;
if (IsClose(ratio, 1.777777778, .03))
{
return "16:9";
}
if (IsClose(ratio, 1.3333333333, .05))
{
return "4:3";
}
if (IsClose(ratio, 1.41))
{
return "1.41:1";
}
if (IsClose(ratio, 1.5))
{
return "1.5:1";
}
if (IsClose(ratio, 1.6))
{
return "1.6:1";
}
if (IsClose(ratio, 1.66666666667))
{
return "5:3";
}
if (IsClose(ratio, 1.85, .02))
{
return "1.85:1";
}
if (IsClose(ratio, 2.35, .025))
{
return "2.35:1";
}
if (IsClose(ratio, 2.4, .025))
{
return "2.40:1";
}
}
return original;
}
private static bool IsClose(double d1, double d2, double variance = .005)
{
return Math.Abs(d1 - d2) <= variance;
}
/// <summary>
/// Gets a frame rate from a string value in ffprobe output
/// This could be a number or in the format of 2997/125.
/// </summary>
/// <param name="value">The value.</param>
/// <returns>System.Nullable{System.Single}.</returns>
private static float? GetFrameRate(string value)
{
if (!string.IsNullOrEmpty(value))
{
var parts = value.Split('/');
float result;
if (parts.Length == 2)
{
result = float.Parse(parts[0], UsCulture) / float.Parse(parts[1], UsCulture);
}
else
{
result = float.Parse(parts[0], UsCulture);
}
return float.IsNaN(result) ? (float?)null : result;
}
return null;
}
}
}