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Refactor and add scheduled task
This commit is contained in:
cvium
@@ -3,176 +3,175 @@ using System.Buffers.Binary;
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using Jellyfin.MediaEncoding.Keyframes.Matroska.Models;
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using NEbml.Core;
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namespace Jellyfin.MediaEncoding.Keyframes.Matroska.Extensions
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namespace Jellyfin.MediaEncoding.Keyframes.Matroska.Extensions;
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/// <summary>
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/// Extension methods for the <see cref="EbmlReader"/> class.
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/// </summary>
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internal static class EbmlReaderExtensions
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{
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/// <summary>
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/// Extension methods for the <see cref="EbmlReader"/> class.
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/// Traverses the current container to find the element with <paramref name="identifier"/> identifier.
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/// </summary>
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internal static class EbmlReaderExtensions
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/// <param name="reader">An instance of <see cref="EbmlReader"/>.</param>
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/// <param name="identifier">The element identifier.</param>
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/// <returns>A value indicating whether the element was found.</returns>
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internal static bool FindElement(this EbmlReader reader, ulong identifier)
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{
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/// <summary>
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/// Traverses the current container to find the element with <paramref name="identifier"/> identifier.
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/// </summary>
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/// <param name="reader">An instance of <see cref="EbmlReader"/>.</param>
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/// <param name="identifier">The element identifier.</param>
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/// <returns>A value indicating whether the element was found.</returns>
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internal static bool FindElement(this EbmlReader reader, ulong identifier)
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while (reader.ReadNext())
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{
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while (reader.ReadNext())
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if (reader.ElementId.EncodedValue == identifier)
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{
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if (reader.ElementId.EncodedValue == identifier)
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{
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return true;
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}
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return true;
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}
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return false;
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}
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/// <summary>
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/// Reads the current position in the file as an unsigned integer converted from binary.
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/// </summary>
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/// <param name="reader">An instance of <see cref="EbmlReader"/>.</param>
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/// <returns>The unsigned integer.</returns>
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internal static uint ReadUIntFromBinary(this EbmlReader reader)
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return false;
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}
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/// <summary>
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/// Reads the current position in the file as an unsigned integer converted from binary.
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/// </summary>
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/// <param name="reader">An instance of <see cref="EbmlReader"/>.</param>
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/// <returns>The unsigned integer.</returns>
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internal static uint ReadUIntFromBinary(this EbmlReader reader)
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{
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var buffer = new byte[4];
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reader.ReadBinary(buffer, 0, 4);
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return BinaryPrimitives.ReadUInt32BigEndian(buffer);
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}
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/// <summary>
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/// Reads from the start of the file to retrieve the SeekHead segment.
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/// </summary>
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/// <param name="reader">An instance of <see cref="EbmlReader"/>.</param>
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/// <returns>Instance of <see cref="SeekHead"/>.</returns>
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internal static SeekHead ReadSeekHead(this EbmlReader reader)
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{
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reader = reader ?? throw new ArgumentNullException(nameof(reader));
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if (reader.ElementPosition != 0)
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{
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var buffer = new byte[4];
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reader.ReadBinary(buffer, 0, 4);
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return BinaryPrimitives.ReadUInt32BigEndian(buffer);
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throw new InvalidOperationException("File position must be at 0");
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}
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/// <summary>
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/// Reads from the start of the file to retrieve the SeekHead segment.
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/// </summary>
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/// <param name="reader">An instance of <see cref="EbmlReader"/>.</param>
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/// <returns>Instance of <see cref="SeekHead"/>.</returns>
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internal static SeekHead ReadSeekHead(this EbmlReader reader)
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// Skip the header
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if (!reader.FindElement(MatroskaConstants.SegmentContainer))
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{
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reader = reader ?? throw new ArgumentNullException(nameof(reader));
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throw new InvalidOperationException("Expected a segment container");
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}
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if (reader.ElementPosition != 0)
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{
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throw new InvalidOperationException("File position must be at 0");
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}
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reader.EnterContainer();
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// Skip the header
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if (!reader.FindElement(MatroskaConstants.SegmentContainer))
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{
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throw new InvalidOperationException("Expected a segment container");
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}
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long? tracksPosition = null;
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long? cuesPosition = null;
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long? infoPosition = null;
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// The first element should be a SeekHead otherwise we'll have to search manually
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if (!reader.FindElement(MatroskaConstants.SeekHead))
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{
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throw new InvalidOperationException("Expected a SeekHead");
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}
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reader.EnterContainer();
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while (reader.FindElement(MatroskaConstants.Seek))
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{
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reader.EnterContainer();
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long? tracksPosition = null;
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long? cuesPosition = null;
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long? infoPosition = null;
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// The first element should be a SeekHead otherwise we'll have to search manually
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if (!reader.FindElement(MatroskaConstants.SeekHead))
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reader.ReadNext();
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var type = (ulong)reader.ReadUIntFromBinary();
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switch (type)
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{
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throw new InvalidOperationException("Expected a SeekHead");
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}
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reader.EnterContainer();
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while (reader.FindElement(MatroskaConstants.Seek))
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{
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reader.EnterContainer();
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reader.ReadNext();
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var type = (ulong)reader.ReadUIntFromBinary();
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switch (type)
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{
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case MatroskaConstants.Tracks:
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reader.ReadNext();
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tracksPosition = (long)reader.ReadUInt();
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break;
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case MatroskaConstants.Cues:
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reader.ReadNext();
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cuesPosition = (long)reader.ReadUInt();
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break;
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case MatroskaConstants.Info:
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reader.ReadNext();
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infoPosition = (long)reader.ReadUInt();
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break;
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}
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reader.LeaveContainer();
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if (tracksPosition.HasValue && cuesPosition.HasValue && infoPosition.HasValue)
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{
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case MatroskaConstants.Tracks:
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reader.ReadNext();
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tracksPosition = (long)reader.ReadUInt();
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break;
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case MatroskaConstants.Cues:
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reader.ReadNext();
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cuesPosition = (long)reader.ReadUInt();
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break;
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case MatroskaConstants.Info:
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reader.ReadNext();
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infoPosition = (long)reader.ReadUInt();
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break;
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}
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}
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reader.LeaveContainer();
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if (!tracksPosition.HasValue || !cuesPosition.HasValue || !infoPosition.HasValue)
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if (tracksPosition.HasValue && cuesPosition.HasValue && infoPosition.HasValue)
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{
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throw new InvalidOperationException("SeekHead is missing or does not contain Info, Tracks and Cues positions");
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break;
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}
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return new SeekHead(infoPosition.Value, tracksPosition.Value, cuesPosition.Value);
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}
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/// <summary>
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/// Reads from SegmentContainer to retrieve the Info segment.
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/// </summary>
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/// <param name="reader">An instance of <see cref="EbmlReader"/>.</param>
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/// <param name="position">The position of the info segment relative to the Segment container.</param>
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/// <returns>Instance of <see cref="Info"/>.</returns>
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internal static Info ReadInfo(this EbmlReader reader, long position)
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{
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reader.ReadAt(position);
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reader.LeaveContainer();
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double? duration = null;
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if (!tracksPosition.HasValue || !cuesPosition.HasValue || !infoPosition.HasValue)
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{
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throw new InvalidOperationException("SeekHead is missing or does not contain Info, Tracks and Cues positions");
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}
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return new SeekHead(infoPosition.Value, tracksPosition.Value, cuesPosition.Value);
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}
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/// <summary>
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/// Reads from SegmentContainer to retrieve the Info segment.
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/// </summary>
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/// <param name="reader">An instance of <see cref="EbmlReader"/>.</param>
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/// <param name="position">The position of the info segment relative to the Segment container.</param>
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/// <returns>Instance of <see cref="Info"/>.</returns>
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internal static Info ReadInfo(this EbmlReader reader, long position)
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{
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reader.ReadAt(position);
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double? duration = null;
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reader.EnterContainer();
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// Mandatory element
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reader.FindElement(MatroskaConstants.TimestampScale);
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var timestampScale = reader.ReadUInt();
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if (reader.FindElement(MatroskaConstants.Duration))
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{
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duration = reader.ReadFloat();
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}
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reader.LeaveContainer();
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return new Info((long)timestampScale, duration);
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}
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/// <summary>
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/// Enters the Tracks segment and reads all tracks to find the specified type.
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/// </summary>
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/// <param name="reader">Instance of <see cref="EbmlReader"/>.</param>
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/// <param name="tracksPosition">The relative position of the tracks segment.</param>
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/// <param name="type">The track type identifier.</param>
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/// <returns>The first track number with the specified type.</returns>
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/// <exception cref="InvalidOperationException">Stream type is not found.</exception>
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internal static ulong FindFirstTrackNumberByType(this EbmlReader reader, long tracksPosition, ulong type)
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{
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reader.ReadAt(tracksPosition);
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reader.EnterContainer();
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while (reader.FindElement(MatroskaConstants.TrackEntry))
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{
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reader.EnterContainer();
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// Mandatory element
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reader.FindElement(MatroskaConstants.TimestampScale);
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var timestampScale = reader.ReadUInt();
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reader.FindElement(MatroskaConstants.TrackNumber);
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var trackNumber = reader.ReadUInt();
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if (reader.FindElement(MatroskaConstants.Duration))
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{
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duration = reader.ReadFloat();
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}
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// Mandatory element
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reader.FindElement(MatroskaConstants.TrackType);
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var trackType = reader.ReadUInt();
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reader.LeaveContainer();
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return new Info((long)timestampScale, duration);
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}
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/// <summary>
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/// Enters the Tracks segment and reads all tracks to find the specified type.
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/// </summary>
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/// <param name="reader">Instance of <see cref="EbmlReader"/>.</param>
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/// <param name="tracksPosition">The relative position of the tracks segment.</param>
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/// <param name="type">The track type identifier.</param>
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/// <returns>The first track number with the specified type.</returns>
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/// <exception cref="InvalidOperationException">Stream type is not found.</exception>
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internal static ulong FindFirstTrackNumberByType(this EbmlReader reader, long tracksPosition, ulong type)
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{
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reader.ReadAt(tracksPosition);
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reader.EnterContainer();
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while (reader.FindElement(MatroskaConstants.TrackEntry))
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if (trackType == MatroskaConstants.TrackTypeVideo)
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{
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reader.EnterContainer();
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// Mandatory element
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reader.FindElement(MatroskaConstants.TrackNumber);
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var trackNumber = reader.ReadUInt();
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// Mandatory element
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reader.FindElement(MatroskaConstants.TrackType);
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var trackType = reader.ReadUInt();
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reader.LeaveContainer();
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if (trackType == MatroskaConstants.TrackTypeVideo)
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{
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reader.LeaveContainer();
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return trackNumber;
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}
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return trackNumber;
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}
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reader.LeaveContainer();
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throw new InvalidOperationException($"No stream with type {type} found");
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}
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reader.LeaveContainer();
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throw new InvalidOperationException($"No stream with type {type} found");
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}
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}
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@@ -1,31 +1,30 @@
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namespace Jellyfin.MediaEncoding.Keyframes.Matroska
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namespace Jellyfin.MediaEncoding.Keyframes.Matroska;
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/// <summary>
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/// Constants for the Matroska identifiers.
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/// </summary>
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public static class MatroskaConstants
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{
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/// <summary>
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/// Constants for the Matroska identifiers.
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/// </summary>
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public static class MatroskaConstants
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{
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internal const ulong SegmentContainer = 0x18538067;
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internal const ulong SegmentContainer = 0x18538067;
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internal const ulong SeekHead = 0x114D9B74;
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internal const ulong Seek = 0x4DBB;
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internal const ulong SeekHead = 0x114D9B74;
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internal const ulong Seek = 0x4DBB;
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internal const ulong Info = 0x1549A966;
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internal const ulong TimestampScale = 0x2AD7B1;
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internal const ulong Duration = 0x4489;
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internal const ulong Info = 0x1549A966;
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internal const ulong TimestampScale = 0x2AD7B1;
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internal const ulong Duration = 0x4489;
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internal const ulong Tracks = 0x1654AE6B;
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internal const ulong TrackEntry = 0xAE;
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internal const ulong TrackNumber = 0xD7;
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internal const ulong TrackType = 0x83;
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internal const ulong Tracks = 0x1654AE6B;
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internal const ulong TrackEntry = 0xAE;
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internal const ulong TrackNumber = 0xD7;
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internal const ulong TrackType = 0x83;
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internal const ulong TrackTypeVideo = 0x1;
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internal const ulong TrackTypeSubtitle = 0x11;
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internal const ulong TrackTypeVideo = 0x1;
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internal const ulong TrackTypeSubtitle = 0x11;
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internal const ulong Cues = 0x1C53BB6B;
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internal const ulong CueTime = 0xB3;
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internal const ulong CuePoint = 0xBB;
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internal const ulong CueTrackPositions = 0xB7;
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internal const ulong CuePointTrackNumber = 0xF7;
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}
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internal const ulong Cues = 0x1C53BB6B;
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internal const ulong CueTime = 0xB3;
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internal const ulong CuePoint = 0xBB;
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internal const ulong CueTrackPositions = 0xB7;
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internal const ulong CuePointTrackNumber = 0xF7;
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}
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@@ -4,73 +4,72 @@ using System.IO;
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using Jellyfin.MediaEncoding.Keyframes.Matroska.Extensions;
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using NEbml.Core;
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namespace Jellyfin.MediaEncoding.Keyframes.Matroska
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namespace Jellyfin.MediaEncoding.Keyframes.Matroska;
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/// <summary>
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/// The keyframe extractor for the matroska container.
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/// </summary>
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public static class MatroskaKeyframeExtractor
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{
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/// <summary>
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/// The keyframe extractor for the matroska container.
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/// Extracts the keyframes in ticks (scaled using the container timestamp scale) from the matroska container.
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/// </summary>
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public static class MatroskaKeyframeExtractor
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/// <param name="filePath">The file path.</param>
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/// <returns>An instance of <see cref="KeyframeData"/>.</returns>
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public static KeyframeData GetKeyframeData(string filePath)
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{
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/// <summary>
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/// Extracts the keyframes in ticks (scaled using the container timestamp scale) from the matroska container.
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/// </summary>
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/// <param name="filePath">The file path.</param>
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/// <returns>An instance of <see cref="KeyframeData"/>.</returns>
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public static KeyframeData GetKeyframeData(string filePath)
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using var stream = File.OpenRead(filePath);
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using var reader = new EbmlReader(stream);
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var seekHead = reader.ReadSeekHead();
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var info = reader.ReadInfo(seekHead.InfoPosition);
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var videoTrackNumber = reader.FindFirstTrackNumberByType(seekHead.TracksPosition, MatroskaConstants.TrackTypeVideo);
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var keyframes = new List<long>();
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reader.ReadAt(seekHead.CuesPosition);
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reader.EnterContainer();
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while (reader.FindElement(MatroskaConstants.CuePoint))
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{
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using var stream = File.OpenRead(filePath);
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using var reader = new EbmlReader(stream);
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var seekHead = reader.ReadSeekHead();
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var info = reader.ReadInfo(seekHead.InfoPosition);
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var videoTrackNumber = reader.FindFirstTrackNumberByType(seekHead.TracksPosition, MatroskaConstants.TrackTypeVideo);
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var keyframes = new List<long>();
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reader.ReadAt(seekHead.CuesPosition);
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reader.EnterContainer();
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ulong? trackNumber = null;
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// Mandatory element
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reader.FindElement(MatroskaConstants.CueTime);
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var cueTime = reader.ReadUInt();
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while (reader.FindElement(MatroskaConstants.CuePoint))
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// Mandatory element
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reader.FindElement(MatroskaConstants.CueTrackPositions);
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reader.EnterContainer();
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if (reader.FindElement(MatroskaConstants.CuePointTrackNumber))
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{
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reader.EnterContainer();
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ulong? trackNumber = null;
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// Mandatory element
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reader.FindElement(MatroskaConstants.CueTime);
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var cueTime = reader.ReadUInt();
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// Mandatory element
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reader.FindElement(MatroskaConstants.CueTrackPositions);
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reader.EnterContainer();
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if (reader.FindElement(MatroskaConstants.CuePointTrackNumber))
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{
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trackNumber = reader.ReadUInt();
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}
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reader.LeaveContainer();
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if (trackNumber == videoTrackNumber)
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{
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keyframes.Add(ScaleToTicks(cueTime, info.TimestampScale));
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}
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reader.LeaveContainer();
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trackNumber = reader.ReadUInt();
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}
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reader.LeaveContainer();
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var result = new KeyframeData(ScaleToTicks(info.Duration ?? 0, info.TimestampScale), keyframes);
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return result;
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if (trackNumber == videoTrackNumber)
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{
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keyframes.Add(ScaleToTicks(cueTime, info.TimestampScale));
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}
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||||
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reader.LeaveContainer();
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}
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private static long ScaleToTicks(ulong unscaledValue, long timestampScale)
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||||
{
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||||
// TimestampScale is in nanoseconds, scale it to get the value in ticks, 1 tick == 100 ns
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||||
return (long)unscaledValue * timestampScale / 100;
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||||
}
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||||
reader.LeaveContainer();
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||||
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||||
private static long ScaleToTicks(double unscaledValue, long timestampScale)
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||||
{
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||||
// TimestampScale is in nanoseconds, scale it to get the value in ticks, 1 tick == 100 ns
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||||
return Convert.ToInt64(unscaledValue * timestampScale / 100);
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||||
}
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||||
var result = new KeyframeData(ScaleToTicks(info.Duration ?? 0, info.TimestampScale), keyframes);
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||||
return result;
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||||
}
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||||
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||||
private static long ScaleToTicks(ulong unscaledValue, long timestampScale)
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||||
{
|
||||
// TimestampScale is in nanoseconds, scale it to get the value in ticks, 1 tick == 100 ns
|
||||
return (long)unscaledValue * timestampScale / 100;
|
||||
}
|
||||
|
||||
private static long ScaleToTicks(double unscaledValue, long timestampScale)
|
||||
{
|
||||
// TimestampScale is in nanoseconds, scale it to get the value in ticks, 1 tick == 100 ns
|
||||
return Convert.ToInt64(unscaledValue * timestampScale / 100);
|
||||
}
|
||||
}
|
||||
|
||||
@@ -1,29 +1,28 @@
|
||||
namespace Jellyfin.MediaEncoding.Keyframes.Matroska.Models
|
||||
namespace Jellyfin.MediaEncoding.Keyframes.Matroska.Models;
|
||||
|
||||
/// <summary>
|
||||
/// The matroska Info segment.
|
||||
/// </summary>
|
||||
internal class Info
|
||||
{
|
||||
/// <summary>
|
||||
/// The matroska Info segment.
|
||||
/// Initializes a new instance of the <see cref="Info"/> class.
|
||||
/// </summary>
|
||||
internal class Info
|
||||
/// <param name="timestampScale">The timestamp scale in nanoseconds.</param>
|
||||
/// <param name="duration">The duration of the entire file.</param>
|
||||
public Info(long timestampScale, double? duration)
|
||||
{
|
||||
/// <summary>
|
||||
/// Initializes a new instance of the <see cref="Info"/> class.
|
||||
/// </summary>
|
||||
/// <param name="timestampScale">The timestamp scale in nanoseconds.</param>
|
||||
/// <param name="duration">The duration of the entire file.</param>
|
||||
public Info(long timestampScale, double? duration)
|
||||
{
|
||||
TimestampScale = timestampScale;
|
||||
Duration = duration;
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Gets the timestamp scale in nanoseconds.
|
||||
/// </summary>
|
||||
public long TimestampScale { get; }
|
||||
|
||||
/// <summary>
|
||||
/// Gets the total duration of the file.
|
||||
/// </summary>
|
||||
public double? Duration { get; }
|
||||
TimestampScale = timestampScale;
|
||||
Duration = duration;
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Gets the timestamp scale in nanoseconds.
|
||||
/// </summary>
|
||||
public long TimestampScale { get; }
|
||||
|
||||
/// <summary>
|
||||
/// Gets the total duration of the file.
|
||||
/// </summary>
|
||||
public double? Duration { get; }
|
||||
}
|
||||
|
||||
@@ -1,36 +1,35 @@
|
||||
namespace Jellyfin.MediaEncoding.Keyframes.Matroska.Models
|
||||
namespace Jellyfin.MediaEncoding.Keyframes.Matroska.Models;
|
||||
|
||||
/// <summary>
|
||||
/// The matroska SeekHead segment. All positions are relative to the Segment container.
|
||||
/// </summary>
|
||||
internal class SeekHead
|
||||
{
|
||||
/// <summary>
|
||||
/// The matroska SeekHead segment. All positions are relative to the Segment container.
|
||||
/// Initializes a new instance of the <see cref="SeekHead"/> class.
|
||||
/// </summary>
|
||||
internal class SeekHead
|
||||
/// <param name="infoPosition">The relative file position of the info segment.</param>
|
||||
/// <param name="tracksPosition">The relative file position of the tracks segment.</param>
|
||||
/// <param name="cuesPosition">The relative file position of the cues segment.</param>
|
||||
public SeekHead(long infoPosition, long tracksPosition, long cuesPosition)
|
||||
{
|
||||
/// <summary>
|
||||
/// Initializes a new instance of the <see cref="SeekHead"/> class.
|
||||
/// </summary>
|
||||
/// <param name="infoPosition">The relative file position of the info segment.</param>
|
||||
/// <param name="tracksPosition">The relative file position of the tracks segment.</param>
|
||||
/// <param name="cuesPosition">The relative file position of the cues segment.</param>
|
||||
public SeekHead(long infoPosition, long tracksPosition, long cuesPosition)
|
||||
{
|
||||
InfoPosition = infoPosition;
|
||||
TracksPosition = tracksPosition;
|
||||
CuesPosition = cuesPosition;
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Gets relative file position of the info segment.
|
||||
/// </summary>
|
||||
public long InfoPosition { get; }
|
||||
|
||||
/// <summary>
|
||||
/// Gets the relative file position of the tracks segment.
|
||||
/// </summary>
|
||||
public long TracksPosition { get; }
|
||||
|
||||
/// <summary>
|
||||
/// Gets the relative file position of the cues segment.
|
||||
/// </summary>
|
||||
public long CuesPosition { get; }
|
||||
InfoPosition = infoPosition;
|
||||
TracksPosition = tracksPosition;
|
||||
CuesPosition = cuesPosition;
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Gets relative file position of the info segment.
|
||||
/// </summary>
|
||||
public long InfoPosition { get; }
|
||||
|
||||
/// <summary>
|
||||
/// Gets the relative file position of the tracks segment.
|
||||
/// </summary>
|
||||
public long TracksPosition { get; }
|
||||
|
||||
/// <summary>
|
||||
/// Gets the relative file position of the cues segment.
|
||||
/// </summary>
|
||||
public long CuesPosition { get; }
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user