wehub-resource-sync
62 lines
2.1 KiB
C#
62 lines
2.1 KiB
C#
#nullable enable
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using Sdcb.FFmpeg.Formats;
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using Sdcb.FFmpeg.Raw;
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namespace T3.VideoServices;
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/// <summary>
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/// Demux-only probe of a video container's metadata — it opens the file and reads stream headers, never
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/// decoding a frame, so it's cheap enough to run on a user-triggered action. Reached from the editor through
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/// <see cref="T3.Core.Video.IVideoEncoderFactory"/>.
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/// </summary>
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internal static class VideoMetadata
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{
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/// <summary>Reads <paramref name="sourcePath"/>'s duration in seconds. Returns false (and 0) when the file
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/// can't be opened or has no usable duration. Never throws.</summary>
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public static bool TryProbeDurationSeconds(string sourcePath, out double seconds)
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{
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seconds = 0;
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if (!FfmpegLibrary.EnsureInitialized())
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return false;
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FormatContext? formatContext = null;
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try
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{
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formatContext = FormatContext.OpenInputUrl(sourcePath, null, null);
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formatContext.LoadStreamInfo();
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// Prefer the video stream's own duration; fall back to the container duration (microsecond units)
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// for files whose stream carries no duration timestamp.
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var stream = formatContext.FindBestStreamOrNull(AVMediaType.Video);
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if (stream != null)
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{
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var videoStream = stream.Value;
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var timeBase = videoStream.TimeBase;
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if (videoStream.Duration != ffmpeg.AV_NOPTS_VALUE && timeBase.Den != 0)
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{
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seconds = videoStream.Duration * timeBase.Num / (double)timeBase.Den;
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if (seconds > 0)
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return true;
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}
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}
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if (formatContext.Duration > 0)
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{
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seconds = formatContext.Duration / (double)ffmpeg.AV_TIME_BASE;
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return seconds > 0;
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}
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return false;
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}
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catch
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{
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seconds = 0;
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return false;
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}
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finally
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{
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formatContext?.Dispose();
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}
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}
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}
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