jellyfin/MediaBrowser.MediaEncoding/Encoder/EncoderValidator.cs

277 lines
10 KiB
C#

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using Microsoft.Extensions.Logging;
namespace MediaBrowser.MediaEncoding.Encoder
{
public class EncoderValidator
{
private const string DefaultEncoderPath = "ffmpeg";
private static readonly string[] requiredDecoders = new[]
{
"mpeg2video",
"h264_qsv",
"hevc_qsv",
"mpeg2_qsv",
"mpeg2_mmal",
"mpeg4_mmal",
"vc1_qsv",
"vc1_mmal",
"h264_cuvid",
"hevc_cuvid",
"dts",
"ac3",
"aac",
"mp3",
"h264",
"h264_mmal",
"hevc"
};
private static readonly string[] requiredEncoders = new[]
{
"libx264",
"libx265",
"mpeg4",
"msmpeg4",
"libvpx",
"libvpx-vp9",
"aac",
"libfdk_aac",
"libmp3lame",
"libopus",
"libvorbis",
"srt",
"h264_nvenc",
"hevc_nvenc",
"h264_qsv",
"hevc_qsv",
"h264_omx",
"hevc_omx",
"h264_vaapi",
"hevc_vaapi",
"h264_v4l2m2m",
"ac3",
"h264_amf",
"hevc_amf"
};
// Try and use the individual library versions to determine a FFmpeg version
// This lookup table is to be maintained with the following command line:
// $ ffmpeg -version | perl -ne ' print "$1=$2.$3," if /^(lib\w+)\s+(\d+)\.\s*(\d+)/'
private static readonly IReadOnlyDictionary<string, Version> _ffmpegVersionMap = new Dictionary<string, Version>
{
{ "libavutil=56.31,libavcodec=58.54,libavformat=58.29,libavdevice=58.8,libavfilter=7.57,libswscale=5.5,libswresample=3.5,libpostproc=55.5,", new Version(4, 2) },
{ "libavutil=56.22,libavcodec=58.35,libavformat=58.20,libavdevice=58.5,libavfilter=7.40,libswscale=5.3,libswresample=3.3,libpostproc=55.3,", new Version(4, 1) },
{ "libavutil=56.14,libavcodec=58.18,libavformat=58.12,libavdevice=58.3,libavfilter=7.16,libswscale=5.1,libswresample=3.1,libpostproc=55.1,", new Version(4, 0) },
{ "libavutil=55.78,libavcodec=57.107,libavformat=57.83,libavdevice=57.10,libavfilter=6.107,libswscale=4.8,libswresample=2.9,libpostproc=54.7,", new Version(3, 4) },
{ "libavutil=55.58,libavcodec=57.89,libavformat=57.71,libavdevice=57.6,libavfilter=6.82,libswscale=4.6,libswresample=2.7,libpostproc=54.5,", new Version(3, 3) },
{ "libavutil=55.34,libavcodec=57.64,libavformat=57.56,libavdevice=57.1,libavfilter=6.65,libswscale=4.2,libswresample=2.3,libpostproc=54.1,", new Version(3, 2) },
{ "libavutil=54.31,libavcodec=56.60,libavformat=56.40,libavdevice=56.4,libavfilter=5.40,libswscale=3.1,libswresample=1.2,libpostproc=53.3,", new Version(2, 8) }
};
private readonly ILogger _logger;
private readonly string _encoderPath;
public EncoderValidator(ILogger logger, string encoderPath = DefaultEncoderPath)
{
_logger = logger;
_encoderPath = encoderPath;
}
public static Version MinVersion { get; } = new Version(4, 0);
public static Version MaxVersion { get; } = null;
public bool ValidateVersion()
{
string output = null;
try
{
output = GetProcessOutput(_encoderPath, "-version");
}
catch (Exception ex)
{
_logger.LogError(ex, "Error validating encoder");
}
if (string.IsNullOrWhiteSpace(output))
{
_logger.LogError("FFmpeg validation: The process returned no result");
return false;
}
_logger.LogDebug("ffmpeg output: {Output}", output);
return ValidateVersionInternal(output);
}
internal bool ValidateVersionInternal(string versionOutput)
{
if (versionOutput.IndexOf("Libav developers", StringComparison.OrdinalIgnoreCase) != -1)
{
_logger.LogError("FFmpeg validation: avconv instead of ffmpeg is not supported");
return false;
}
// Work out what the version under test is
var version = GetFFmpegVersion(versionOutput);
_logger.LogInformation("Found ffmpeg version {0}", version != null ? version.ToString() : "unknown");
if (version == null)
{
if (MinVersion != null && MaxVersion != null) // Version is unknown
{
if (MinVersion == MaxVersion)
{
_logger.LogWarning("FFmpeg validation: We recommend ffmpeg version {0}", MinVersion);
}
else
{
_logger.LogWarning("FFmpeg validation: We recommend a minimum of {0} and maximum of {1}", MinVersion, MaxVersion);
}
}
return false;
}
else if (MinVersion != null && version < MinVersion) // Version is below what we recommend
{
_logger.LogWarning("FFmpeg validation: The minimum recommended ffmpeg version is {0}", MinVersion);
return false;
}
else if (MaxVersion != null && version > MaxVersion) // Version is above what we recommend
{
_logger.LogWarning("FFmpeg validation: The maximum recommended ffmpeg version is {0}", MaxVersion);
return false;
}
return true;
}
public IEnumerable<string> GetDecoders() => GetCodecs(Codec.Decoder);
public IEnumerable<string> GetEncoders() => GetCodecs(Codec.Encoder);
/// <summary>
/// Using the output from "ffmpeg -version" work out the FFmpeg version.
/// For pre-built binaries the first line should contain a string like "ffmpeg version x.y", which is easy
/// to parse. If this is not available, then we try to match known library versions to FFmpeg versions.
/// If that fails then we use one of the main libraries to determine if it's new/older than the latest
/// we have stored.
/// </summary>
/// <param name="output"></param>
/// <returns></returns>
internal static Version GetFFmpegVersion(string output)
{
// For pre-built binaries the FFmpeg version should be mentioned at the very start of the output
var match = Regex.Match(output, @"^ffmpeg version n?((?:\d+\.?)+)");
if (match.Success)
{
return new Version(match.Groups[1].Value);
}
else
{
// Create a reduced version string and lookup key from dictionary
var reducedVersion = GetLibrariesVersionString(output);
// Try to lookup the string and return Key, otherwise if not found returns null
return _ffmpegVersionMap.TryGetValue(reducedVersion, out Version version) ? version : null;
}
}
/// <summary>
/// Grabs the library names and major.minor version numbers from the 'ffmpeg -version' output
/// and condenses them on to one line. Output format is "name1=major.minor,name2=major.minor,etc."
/// </summary>
/// <param name="output"></param>
/// <returns></returns>
private static string GetLibrariesVersionString(string output)
{
var rc = new StringBuilder(144);
foreach (Match m in Regex.Matches(
output,
@"((?<name>lib\w+)\s+(?<major>\d+)\.\s*(?<minor>\d+))",
RegexOptions.Multiline))
{
rc.Append(m.Groups["name"])
.Append('=')
.Append(m.Groups["major"])
.Append('.')
.Append(m.Groups["minor"])
.Append(',');
}
return rc.Length == 0 ? null : rc.ToString();
}
private enum Codec
{
Encoder,
Decoder
}
private IEnumerable<string> GetCodecs(Codec codec)
{
string codecstr = codec == Codec.Encoder ? "encoders" : "decoders";
string output = null;
try
{
output = GetProcessOutput(_encoderPath, "-" + codecstr);
}
catch (Exception ex)
{
_logger.LogError(ex, "Error detecting available {Codec}", codecstr);
}
if (string.IsNullOrWhiteSpace(output))
{
return Enumerable.Empty<string>();
}
var required = codec == Codec.Encoder ? requiredEncoders : requiredDecoders;
var found = Regex
.Matches(output, @"^\s\S{6}\s(?<codec>[\w|-]+)\s+.+$", RegexOptions.Multiline)
.Cast<Match>()
.Select(x => x.Groups["codec"].Value)
.Where(x => required.Contains(x));
_logger.LogInformation("Available {Codec}: {Codecs}", codecstr, found);
return found;
}
private string GetProcessOutput(string path, string arguments)
{
using (var process = new Process()
{
StartInfo = new ProcessStartInfo(path, arguments)
{
CreateNoWindow = true,
UseShellExecute = false,
WindowStyle = ProcessWindowStyle.Hidden,
ErrorDialog = false,
RedirectStandardOutput = true,
// ffmpeg uses stderr to log info, don't show this
RedirectStandardError = true
}
})
{
_logger.LogDebug("Running {Path} {Arguments}", path, arguments);
process.Start();
return process.StandardOutput.ReadToEnd();
}
}
}
}