353 lines
12 KiB
C#
353 lines
12 KiB
C#
#pragma warning disable CS1591
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Globalization;
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using System.Linq;
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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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"h264",
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"hevc",
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"mpeg2video",
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"mpeg4",
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"msmpeg4",
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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_qsv",
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"hevc_qsv",
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"mpeg2_qsv",
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"vc1_qsv",
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"vp8_qsv",
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"vp9_qsv",
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"h264_cuvid",
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"hevc_cuvid",
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"mpeg2_cuvid",
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"vc1_cuvid",
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"mpeg4_cuvid",
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"vp8_cuvid",
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"vp9_cuvid",
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"h264_mmal",
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"mpeg2_mmal",
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"mpeg4_mmal",
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"vc1_mmal",
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"h264_mediacodec",
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"hevc_mediacodec",
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"mpeg2_mediacodec",
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"mpeg4_mediacodec",
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"vp8_mediacodec",
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"vp9_mediacodec",
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"h264_opencl",
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"hevc_opencl",
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"mpeg2_opencl",
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"mpeg4_opencl",
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"vp8_opencl",
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"vp9_opencl",
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"vc1_opencl"
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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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"ac3",
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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_amf",
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"hevc_amf",
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"h264_qsv",
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"hevc_qsv",
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"h264_nvenc",
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"hevc_nvenc",
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"h264_vaapi",
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"hevc_vaapi",
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"h264_omx",
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"hevc_omx",
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"h264_v4l2m2m",
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"h264_videotoolbox",
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"hevc_videotoolbox"
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};
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// These are the library versions that corresponds to our minimum ffmpeg version 4.x according to the version table below
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private static readonly IReadOnlyDictionary<string, Version> _ffmpegMinimumLibraryVersions = new Dictionary<string, Version>
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{
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{ "libavutil", new Version(56, 14) },
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{ "libavcodec", new Version(58, 18) },
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{ "libavformat", new Version(58, 12) },
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{ "libavdevice", new Version(58, 3) },
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{ "libavfilter", new Version(7, 16) },
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{ "libswscale", new Version(5, 1) },
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{ "libswresample", new Version(3, 1) },
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{ "libpostproc", new Version(55, 1) }
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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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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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// When changing this, also change the minimum library versions in _ffmpegMinimumLibraryVersions
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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 {Version}", version != null ? version.ToString() : "unknown");
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if (version == null)
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{
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if (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 version {MinVersion}", 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 {MinVersion} and maximum of {MaxVersion}", MinVersion, MaxVersion);
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}
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}
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else
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{
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_logger.LogWarning("FFmpeg validation: We recommend minimum version {MinVersion}", MinVersion);
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}
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return false;
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}
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else if (version < MinVersion) // Version is below what we recommend
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{
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_logger.LogWarning("FFmpeg validation: The minimum recommended version is {MinVersion}", 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 version is {MaxVersion}", 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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public IEnumerable<string> GetHwaccels() => GetHwaccelTypes();
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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 test the libraries to determine if they're newer than our minimum versions.
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/// </summary>
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/// <param name="output">The output from "ffmpeg -version".</param>
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/// <returns>The FFmpeg version.</returns>
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internal 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?((?:[0-9]+\.?)+)");
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if (match.Success)
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{
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if (Version.TryParse(match.Groups[1].Value, out var result))
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{
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return result;
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}
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}
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var versionMap = GetFFmpegLibraryVersions(output);
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var allVersionsValidated = true;
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foreach (var minimumVersion in _ffmpegMinimumLibraryVersions)
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{
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if (versionMap.TryGetValue(minimumVersion.Key, out var foundVersion))
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{
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if (foundVersion >= minimumVersion.Value)
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{
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_logger.LogInformation("Found {Library} version {FoundVersion} ({MinimumVersion})", minimumVersion.Key, foundVersion, minimumVersion.Value);
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}
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else
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{
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_logger.LogWarning("Found {Library} version {FoundVersion} lower than recommended version {MinimumVersion}", minimumVersion.Key, foundVersion, minimumVersion.Value);
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allVersionsValidated = false;
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}
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}
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else
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{
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_logger.LogError("{Library} version not found", minimumVersion.Key);
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allVersionsValidated = false;
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}
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}
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return allVersionsValidated ? MinVersion : null;
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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">The 'ffmpeg -version' output.</param>
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/// <returns>The library names and major.minor version numbers.</returns>
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private static IReadOnlyDictionary<string, Version> GetFFmpegLibraryVersions(string output)
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{
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var map = new Dictionary<string, Version>();
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foreach (Match match in Regex.Matches(
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output,
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@"((?<name>lib\w+)\s+(?<major>[0-9]+)\.\s*(?<minor>[0-9]+))",
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RegexOptions.Multiline))
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{
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var version = new Version(
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int.Parse(match.Groups["major"].Value, CultureInfo.InvariantCulture),
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int.Parse(match.Groups["minor"].Value, CultureInfo.InvariantCulture));
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map.Add(match.Groups["name"].Value, version);
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}
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return map;
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}
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private IEnumerable<string> GetHwaccelTypes()
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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, "-hwaccels");
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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 hwaccel types");
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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 found = output.Split(new char[] { '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries).Skip(1).Distinct().ToList();
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_logger.LogInformation("Available hwaccel types: {Types}", found);
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return found;
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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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