48 lines
2.0 KiB
C#
48 lines
2.0 KiB
C#
using System.Text.RegularExpressions;
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namespace ytLive.Services.Encoder;
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/// <summary>A decoded ffmpeg <c>-stats</c> progress line (pure data).</summary>
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public readonly record struct FfmpegProgress(
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long Frame,
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double Fps,
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double BitrateKbps,
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TimeSpan Duration,
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long SizeBytes);
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/// <summary>
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/// Pure parser for ffmpeg's periodic <c>frame= fps= size= time= bitrate=</c> stderr
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/// lines (the <c>-stats</c>/<c>-stats_period</c> output). Unit-tested in isolation
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/// so the encoder loop stays a thin wire.
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/// </summary>
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public static class FfmpegProgressParser
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{
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// frame= 123 fps= 59.9 q=28.0 size= 1024KiB time=00:00:02.04 bitrate= 4000.1kbits/s speed=1.00x
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private static readonly Regex Line = new(
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@"frame=\s*(?<frame>\d+)\s+fps=\s*(?<fps>[\d.]+).*?"
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+ @"size=\s*(?<size>\d+)KiB.*?"
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+ @"time=(?<time>\d{2}):(?<min>\d{2}):(?<sec>[\d.]+).*?"
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+ @"bitrate=\s*(?<bitrate>[\d.]+)kbits/s",
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RegexOptions.Compiled | RegexOptions.CultureInvariant);
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/// <summary>Returns null for non-progress lines (errors, warnings, banner).</summary>
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public static FfmpegProgress? TryParse(string line)
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{
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if (string.IsNullOrWhiteSpace(line)) return null;
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var m = Line.Match(line);
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if (!m.Success) return null;
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var frame = long.Parse(m.Groups["frame"].Value);
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var fps = double.Parse(m.Groups["fps"].Value, System.Globalization.CultureInfo.InvariantCulture);
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var size = long.Parse(m.Groups["size"].Value);
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var bitrate = double.Parse(m.Groups["bitrate"].Value, System.Globalization.CultureInfo.InvariantCulture);
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var hours = int.Parse(m.Groups["time"].Value);
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var minutes = int.Parse(m.Groups["min"].Value);
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var seconds = double.Parse(m.Groups["sec"].Value, System.Globalization.CultureInfo.InvariantCulture);
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var duration = TimeSpan.FromSeconds(hours * 3600 + minutes * 60 + seconds);
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return new FfmpegProgress(frame, fps, bitrate, duration, size * 1024);
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}
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}
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