/// <inheritdoc />
/// <exception cref="NotSupportedException">The volume has no compressed data</exception>
public override VolumeSliceCollection GetSliceRanges(IReadOnlyCollection <VolumeSliceRangeDefinition> ranges, IProgress <VolumeSliceDefinition> progress = null, CancellationToken ct = default(CancellationToken))
{
if (ranges == null)
{
throw new ArgumentNullException(nameof(ranges));
}
if (ranges.Count == 0)
{
return(new VolumeSliceCollection());
}
var combinedRanges = ranges.Merge().ToArray();
//Partial scan in directed compressed volumes
if (combinedRanges.All(r => _CompressedData[r.Direction] != null) &&
combinedRanges.Length <= Constants.RangeNumberLimitForEfficientScan &&
combinedRanges.Sum(r => r.Last - r.First + 1) < Constants.SliceNumberLimitForEfficientScan)
{
return(new VolumeSliceCollection(ranges.Select(range => GetSliceRange(range))));
}
var direction = combinedRanges.First().Direction;
//Full scan in directed volume in case all ranges have this direction. Scan performance is the same, but copy is more efficient
if (_CompressedData[direction] == null || combinedRanges.Any(r => r.Direction != direction))
{
direction = Direction.Z;
}
if (_CompressedData[direction] == null)
{
throw new NotSupportedException(Resources.GetResource <Volume>("CompressedDataMissing_ErrorText"));
}
using (var input = new MemoryStream(_CompressedData[direction], false))
{
var inputWrapper = new StreamWrapper(input);
var rangeReader = new VolumeSliceRangeCollector(Metadata, direction, combinedRanges, progress, ct);
var error = ( VolumeError )DecompressVolume(inputWrapper.Interop, rangeReader.Interop);
if (error != VolumeError.Success)
{
throw new VolumeException(error, Resources.FormatResource <Volume>("Decompression_ErrorText", error));
}
return(rangeReader.GetSliceRangeCollection());
}
}
/// <inheritdoc />
/// <exception cref="NotSupportedException">The volume has no compressed data</exception>
public override VolumeSlice GetSlice(VolumeSliceDefinition slice, IProgress <VolumeSliceDefinition> progress = null, CancellationToken ct = default(CancellationToken))
{
//Videos with a very small number of frames appearantly have issues with av_seek, so we do a full scan instead
if (_CompressedData[slice.Direction] != null)
{
using (var input = new MemoryStream(_CompressedData[slice.Direction]))
{
var inputWrapper = new StreamWrapper(input);
var outputWrapper = new VolumeSliceRangeCollector(Metadata, slice.Direction, new[] { new VolumeSliceRangeDefinition(slice.Direction, slice.Index, slice.Index) }, progress, ct);
var error = ( VolumeError )DecompressSlices(inputWrapper.Interop, outputWrapper.Interop, slice.Index, 1);
if (error != VolumeError.Success)
{
throw new VolumeException(error, Resources.FormatResource <Volume>("Decompression_ErrorText", error));
}
return(outputWrapper.GetSlice(slice.Direction, slice.Index));
}
}
if (_CompressedData[Direction.Z] == null)
{
throw new NotSupportedException(Resources.GetResource <Volume>("CompressedDataMissing_ErrorText"));
}
using (var input = new MemoryStream(_CompressedData[Direction.Z]))
{
var inputWrapper = new StreamWrapper(input);
var rangeReader = new VolumeSliceRangeCollector(Metadata, Direction.Z, new[] { new VolumeSliceRangeDefinition(slice.Direction, slice.Index, slice.Index) }, progress, ct);
var error = ( VolumeError )DecompressVolume(inputWrapper.Interop, rangeReader.Interop);
if (error != VolumeError.Success)
{
throw new VolumeException(error, Resources.FormatResource <Volume>("Decompression_ErrorText", error));
}
return(rangeReader.GetSlice(slice.Direction, slice.Index));
}
}
/// <inheritdoc />
/// <exception cref="NotSupportedException">The volume has no compressed data</exception>
public override VolumeSliceRange GetSliceRange(VolumeSliceRangeDefinition range, IProgress <VolumeSliceDefinition> progress = null, CancellationToken ct = default(CancellationToken))
{
if (_CompressedData[range.Direction] != null)
{
using (var input = new MemoryStream(_CompressedData[range.Direction], false))
{
var inputWrapper = new StreamWrapper(input);
var rangeReader = new VolumeSliceRangeCollector(Metadata, range.Direction, new[] { range }, progress, ct);
var error = ( VolumeError )DecompressSlices(inputWrapper.Interop, rangeReader.Interop, range.First, ( ushort )(range.Last - range.First + 1));
if (error != VolumeError.Success)
{
throw new VolumeException(error, Resources.FormatResource <Volume>("Decompression_ErrorText", error));
}
return(rangeReader.GetSliceRange(range));
}
}
if (_CompressedData[Direction.Z] == null)
{
throw new NotSupportedException(Resources.GetResource <Volume>("CompressedDataMissing_ErrorText"));
}
using (var input = new MemoryStream(_CompressedData[Direction.Z], false))
{
var inputWrapper = new StreamWrapper(input);
var rangeReader = new VolumeSliceRangeCollector(Metadata, Direction.Z, new[] { range }, progress, ct);
var error = ( VolumeError )DecompressVolume(inputWrapper.Interop, rangeReader.Interop);
if (error != VolumeError.Success)
{
throw new VolumeException(error, Resources.FormatResource <Volume>("Decompression_ErrorText", error));
}
return(rangeReader.GetSliceRange(range));
}
}
