/// <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));
}
}
/// <summary> /// Gets the specified slice. This is the most memory friendly and usually the fastest approach to get a single slice. /// </summary> /// <param name="slice">The requested slice.</param> /// <param name="progress">A progress indicator, which reports the current slice number.</param> /// <param name="ct"></param> /// <returns></returns> /// <exception cref="VolumeException">Error during decoding</exception> public abstract VolumeSlice GetSlice(VolumeSliceDefinition slice, IProgress <VolumeSliceDefinition> progress = null, CancellationToken ct = default(CancellationToken));
/// <inheritdoc />
public override VolumeSlice GetSlice(VolumeSliceDefinition slice, IProgress <VolumeSliceDefinition> progress = null, CancellationToken ct = default(CancellationToken))
{
return(VolumeSlice.Extract(slice.Direction, slice.Index, Metadata, Data));
}
