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