public void Parse(IMpeg2VideoReader reader, IResultNodeState resultState)
{
if (reader.State.LastHeaderName == null)
{
// MPEG data cannot start with an extension!
resultState.Invalidate();
return;
}
var extensionId = (ExtensionId)reader.GetBits(4, Attribute.ExtensionStartCodeIdentifier, _extensionTypeResultFormatter);
IExtensionParser extensionParser;
if (!_extensionParsers.TryGetValue(extensionId, out extensionParser) || !CheckExtensionOccurance(reader.State, extensionId))
{
resultState.Invalidate();
return;
}
// Note: Do not invoke the reader state here, it is *NOT* recursive!!
extensionParser.Parse(reader, resultState);
if (resultState.Valid)
{
if (reader.State.Picture.Initialized)
{
reader.State.Picture.AddExtension(extensionId);
}
else
{
reader.State.Sequence.AddExtension(extensionId);
}
}
}
public void Parse(IMpeg2VideoReader reader, IResultNodeState resultState)
{
resultState.Name = Name;
reader.State.Picture.Reset();
reader.State.SeenGop = false;
if ((reader.State.LastHeaderName != null) && (reader.State.LastHeaderName != Slice.Name))
{
resultState.Invalidate();
return; // Invalid header sequence
}
ISequenceState sequenceState = reader.State.Sequence;
sequenceState.Reset();
sequenceState.Initialized = true;
sequenceState.HorizontalSize = (ushort)reader.GetBits(12, Attribute.HorizontalSizeValue);
sequenceState.VerticalSize = (ushort)reader.GetBits(12, Attribute.VerticalSizeValue);
reader.GetBits(4, Attribute.AspectRatioInformation, AspectRatioResultFormatter);
reader.GetBits(4, Attribute.FrameRateCode, FrameRateResultFormatter);
reader.GetBits(18, Attribute.BitRateValue);
reader.GetMarker();
reader.GetBits(10, Attribute.VbvBufferSizeValue);
reader.GetFlag(Attribute.ConstrainedParametersFlag);
if (reader.GetFlag(Attribute.LoadIntraQuantiserMatrix))
{
reader.GetData(Attribute.IntraQuantiserMatrix, 64);
}
if (reader.GetFlag(Attribute.LoadNonIntraQuantiserMatrix))
{
reader.GetData(Attribute.NonIntraQuantiserMatrix, 64);
}
}
public void Parse(IMpeg2VideoReader reader, IResultNodeState resultState)
{
resultState.Name = Name;
if ((reader.State.LastHeaderName != SequenceHeader.Name))
{
resultState.Invalidate();
return; // Invalid header sequence
}
ISequenceState sequenceState = reader.State.Sequence;
reader.GetBits(8, Attribute.ProfileAndLevelIndication);
sequenceState.Progressive = reader.GetFlag(Attribute.ProgressiveSequence);
sequenceState.ChromaFormat = (ChromaFormat)reader.GetBits(2, Attribute.ChromaFormat);
uint horizontalSizeExtension = reader.GetBits(2, Attribute.HorizontalSizeExtension);
sequenceState.HorizontalSize = (ushort)((sequenceState.HorizontalSize & 0x0fff) | (horizontalSizeExtension << 12));
uint verticalSizeExtension = reader.GetBits(2, Attribute.VerticalSizeExtension);
sequenceState.VerticalSize = (ushort)((sequenceState.VerticalSize & 0x0fff) | (verticalSizeExtension << 12));
reader.GetBits(12, Attribute.BitRateExtension);
reader.GetMarker();
reader.GetBits(8, Attribute.VbvBufferSizeExtension);
reader.GetBits(1, Attribute.LowDelay);
reader.GetBits(2, Attribute.FrameRateExtensionN);
reader.GetBits(5, Attribute.FrameRateExtensionD);
}
public void Parse(IMpeg2VideoReader reader, IResultNodeState resultState)
{
resultState.Name = Name;
ScalableMode scalableMode = (ScalableMode)reader.GetBits(2, Attribute.ScalableMode, _scalableModeResultFormatter);
reader.State.Sequence.ScalableMode = scalableMode;
reader.GetBits(4, Attribute.LayerID);
if (scalableMode == ScalableMode.SpatialScalability)
{
reader.GetBits(14, Attribute.LowerLayerPredictionHorizontalSize);
reader.GetMarker();
reader.GetBits(14, Attribute.LowerLayerPredictionVerticalSize);
reader.GetBits(5, Attribute.HorizontalSubsamplingFactorM);
reader.GetBits(5, Attribute.HorizontalSubsamplingFactorN);
reader.GetBits(5, Attribute.VerticalSubsamplingFactorM);
reader.GetBits(5, Attribute.VerticalSubsamplingFactorN);
}
if (scalableMode == ScalableMode.TemporalScalability)
{
if (reader.GetFlag(Attribute.PictureMuxEnable))
{
reader.GetFlag(Attribute.MuxToProgressiveSequence);
}
reader.GetBits(3, Attribute.PictureMuxOrder);
reader.GetBits(3, Attribute.PictureMuxFactor);
}
}
public void Parse(IMpeg2VideoReader reader, IResultNodeState resultState)
{
IPictureState pictureState = reader.State.Picture;
resultState.Name = Name;
// It can occur after the last slice of the previous picture or after a sequence header
// or group of pictures header, possible followed by user data and/or extensions.
if ((reader.State.LastHeaderName != Slice.Name) && pictureState.Initialized)
{
resultState.Invalidate();
return;
}
if (!reader.State.Sequence.Initialized && !reader.State.SeenGop)
{
reader.InsertReferenceHeaderBeforeStartCode();
}
pictureState.Reset();
reader.State.Slice.Reset();
reader.GetBits(10, Attribute.TemporalReference);
var pictureCodingType = (PictureCodingType)reader.GetBits(3, Attribute.PictureCodingType, _pictureCodingTypeResultFormatter);
pictureState.CodingType = pictureCodingType;
reader.GetBits(16, Attribute.VbvDelay);
if ((pictureCodingType == PictureCodingType.PType) || (pictureCodingType == PictureCodingType.BType))
{
reader.GetFlag(Attribute.FullPelForwardVector);
byte forwardFCode = (byte)reader.GetBits(3, Attribute.ForwardFCode);
pictureState.ForwardHorizontalFCode = forwardFCode;
pictureState.ForwardVerticalFCode = forwardFCode;
}
if (pictureCodingType == PictureCodingType.BType)
{
reader.GetFlag(Attribute.FullPelBackwardVector);
byte backwardFCode = (byte)reader.GetBits(3, Attribute.BackwardFCode);
pictureState.BackwardHorizontalFCode = backwardFCode;
pictureState.BackwardVerticalFCode = backwardFCode;
}
int count = 0; // Sanity check
uint maxExtraInformationLength = reader.State.Configuration.PictureHeaderMaxLengthOfExtraInformation;
while (reader.ShowBits(1) == 1)
{
reader.GetBits(1); // ExtraBitPicture
reader.GetBits(8); // ExtraInformationPicture
if (count++ > maxExtraInformationLength)
{
resultState.Invalidate();
return;
}
}
}
public Mpeg2VideoCarver(IMpeg2VideoReader reader, IResultParser <IMpeg2VideoReader> videoHeaderParser, IScanContext scanContext)
{
_reader = reader;
_videoHeaderParser = videoHeaderParser;
_scanContext = scanContext;
_state = reader.State;
_minHeaderCount = (uint)Mpeg2VideoDetector.Configurable[Mpeg2VideoDetector.ConfigurationKey.MinVideoHeaderCount];
}
public void Parse(IMpeg2VideoReader reader, IResultNodeState resultState)
{
resultState.Name = Name;
reader.GetBits(2, Attribute.ReferenceSelectCode);
reader.GetBits(10, Attribute.ForwardTemporalReference);
reader.GetMarker();
reader.GetBits(10, Attribute.BackwardTemporalReference);
}
public void Parse(IMpeg2VideoReader reader, IResultNodeState resultState)
{
resultState.Name = Name;
reader.GetFlag(Attribute.CopyrightFlag);
reader.GetBits(8, Attribute.CopyrightIdentifier);
reader.GetFlag(Attribute.OriginalOrCopy); // TODO: true = original, false = copy
reader.GetReservedBits(7);
reader.GetMarker();
reader.GetAttribute(_copyrightNumberAttribute);
}
public void Parse(IMpeg2VideoReader reader, IResultNodeState resultState)
{
resultState.Name = Name;
for (int i = GetFrameCenterOffsets(reader); i > 0; i--)
{
reader.GetBits(16, Attribute.FrameCenterHorizontalOffset);
reader.GetMarker();
reader.GetBits(16, Attribute.FrameCenterVerticalOffset);
reader.GetMarker();
}
}
public void Parse(IMpeg2VideoReader reader, IResultNodeState resultState)
{
resultState.Name = Name;
reader.State.Sequence.Reset();
reader.State.Picture.Reset();
reader.State.SeenGop = false;
if (reader.State.LastHeaderName != Slice.Name)
{
resultState.Invalidate();
return; // Invalid header sequence
}
}
public void Parse(IMpeg2VideoReader reader, IResultNodeState resultState)
{
resultState.Name = Name;
reader.GetBits(10, Attribute.LowerLayerTemporalReference);
reader.GetMarker();
reader.GetBits(15, Attribute.LowerLayerHorizontalOffset);
reader.GetMarker();
reader.GetBits(15, Attribute.LowerLayerVerticalOffset);
reader.State.Picture.SpatialScalability = true;
reader.State.Picture.SpatialTemporalWeightCodeTableIndex = (byte)reader.GetBits(2, Attribute.SpatialTemporalWeightCodeTableIndex);
reader.GetFlag(Attribute.LowerLayerProgressiveFrame);
reader.GetFlag(Attribute.LowerLayerDeinterlacedFieldSelect);
}
public void Parse(IMpeg2VideoReader reader, IResultNodeState resultState)
{
resultState.Name = Name;
reader.GetBits(3, Attribute.VideoFormat, _videoFormatResultFormatter);
if (reader.GetFlag(Attribute.ColourDescription))
{
reader.GetBits(8, Attribute.ColourPrimaries);
reader.GetBits(8, Attribute.TransferCharacteristics);
reader.GetBits(8, Attribute.MatrixCoefficients);
}
reader.GetBits(14, Attribute.DisplayHorizontalSize);
reader.GetMarker();
reader.GetBits(14, Attribute.DisplayVerticalSize);
}
public void Parse(IMpeg2VideoReader reader, IResultNodeState resultState)
{
resultState.Name = Name;
// Note: Last header must be a sequence, group of pictures or picture header, or an extension.
// Note: Sequence end code always ends parsing of a block, so it cannot occur at this point!
string lastHeader = reader.State.LastHeaderName;
if ((lastHeader == Slice.Name) || (lastHeader == UserData.Name))
{
// User data cannot occur immediately after a slice or (another) user data
resultState.Invalidate();
return;
}
reader.GetAttribute(_userDataAttribute);
}
public void Parse(IMpeg2VideoReader reader, IResultNodeState resultState)
{
resultState.Name = Name;
if (reader.GetFlag(Attribute.LoadIntraQuantiserMatrix))
{
reader.GetData(Attribute.IntraQuantiserMatrix, 64);
}
if (reader.GetFlag(Attribute.LoadNonIntraQuantiserMatrix))
{
reader.GetData(Attribute.NonIntraQuantiserMatrix, 64);
}
if (reader.GetFlag(Attribute.LoadChromaIntraQuantiserMatrix))
{
reader.GetData(Attribute.ChromaIntraQuantiserMatrix, 64);
}
if (reader.GetFlag(Attribute.LoadChromaNonIntraQuantiserMatrix))
{
reader.GetData(Attribute.ChromaNonIntraQuantiserMatrix, 64);
}
}
/// <summary>
/// Computes the number of frame center offsets in the header.
/// </summary>
private static int GetFrameCenterOffsets(IMpeg2VideoReader reader)
{
if (reader.State.Sequence.Progressive)
{
if (reader.State.Picture.RepeatFirstField)
{
if (reader.State.Picture.TopFieldFirst)
{
return(3);
}
else
{
return(2);
}
}
else
{
return(1);
}
}
else
{
// TODO: next line may be wrong !!!!
if (reader.State.Picture.Structure != PictureStructure.FramePicture)
{
return(1);
}
else
{
if (reader.State.Picture.RepeatFirstField)
{
return(3);
}
else
{
return(2);
}
}
}
}
public void Parse(IMpeg2VideoReader reader, IResultNodeState resultState)
{
resultState.Name = Name;
reader.GetReservedBits(1);
reader.GetBits(7, Attribute.CameraID);
reader.GetMarker();
reader.GetBits(22, Attribute.HeightOfImageDevice);
reader.GetMarker();
reader.GetBits(22, Attribute.FNumber);
reader.GetMarker();
reader.GetBits(22, Attribute.VerticalAngleOfView);
reader.GetMarker();
reader.GetBits(16, Attribute.CameraPositionXUpper);
reader.GetMarker();
reader.GetBits(16, Attribute.CameraPositionXLower);
reader.GetMarker();
reader.GetBits(16, Attribute.CameraPositionYUpper);
reader.GetMarker();
reader.GetBits(16, Attribute.CameraPositionYLower);
reader.GetMarker();
reader.GetBits(16, Attribute.CameraPositionZUpper);
reader.GetMarker();
reader.GetBits(16, Attribute.CameraPositionZLower);
reader.GetMarker();
reader.GetBits(22, Attribute.CameraDirectionX);
reader.GetMarker();
reader.GetBits(22, Attribute.CameraDirectionY);
reader.GetMarker();
reader.GetBits(22, Attribute.CameraDirectionZ);
reader.GetMarker();
reader.GetBits(22, Attribute.ImagePlaneVerticalX);
reader.GetMarker();
reader.GetBits(22, Attribute.ImagePlaneVerticalY);
reader.GetMarker();
reader.GetBits(22, Attribute.ImagePlaneVerticalZ);
reader.GetMarker();
reader.GetReservedBits(32);
}
public void Parse(IMpeg2VideoReader reader, IResultNodeState resultState)
{
resultState.Name = Name;
if (reader.State.LastHeaderName != PictureHeader.Name)
{
resultState.Invalidate();
return; // Invalid header sequence
}
IPictureState pictureState = reader.State.Picture;
pictureState.ForwardHorizontalFCode = (byte)reader.GetBits(4, Attribute.ForwardHorizontalFCode);
pictureState.ForwardVerticalFCode = (byte)reader.GetBits(4, Attribute.ForwardVerticalFCode);
pictureState.BackwardHorizontalFCode = (byte)reader.GetBits(4, Attribute.BackwardHorizontalFCode);
pictureState.BackwardVerticalFCode = (byte)reader.GetBits(4, Attribute.BackwardVerticalFCode);
reader.GetBits(2, Attribute.IntraDCPrecision);
pictureState.Structure = (PictureStructure)reader.GetBits(2, Attribute.PictureStructure, _pictureStructureResultFormatter);
pictureState.TopFieldFirst = reader.GetFlag(Attribute.TopFieldFirst);
pictureState.FramePredFrameDct = reader.GetFlag(Attribute.FramePredFrameDct);
pictureState.ConcealmentMotionVectors = reader.GetFlag(Attribute.ConcealmentMotionVectors);
reader.GetBits(1, Attribute.QuantiserScaleType);
pictureState.IntraVlcFormat = (reader.GetBits(1, Attribute.IntraVlcFormat) == 0) ? false : true;
reader.GetFlag(Attribute.AlternateScan);
pictureState.RepeatFirstField = reader.GetFlag(Attribute.RepeatFirstField);
reader.GetFlag(Attribute.Chroma420Type);
reader.GetFlag(Attribute.ProgressiveFrame);
if (reader.GetFlag(Attribute.CompositeDisplayFlag))
{
reader.GetBits(1, Attribute.VAxis);
reader.GetBits(3, Attribute.FieldSequence);
reader.GetBits(1, Attribute.SubCarrier);
reader.GetBits(7, Attribute.BurstAmplitude);
reader.GetBits(8, Attribute.SubCarrierPhase);
}
}
public void Parse(IMpeg2VideoReader reader, IResultNodeState resultState)
{
resultState.Name = Name;
IMpeg2VideoState state = reader.State;
// It can occur after the last slice of a picture or after a sequence header, possible followed by user data and/or extensions
if ((state.LastHeaderName != Slice.Name) && (state.LastHeaderName != null) && (!state.Sequence.Initialized || state.SeenGop || state.Picture.Initialized))
{
resultState.Invalidate();
return;
}
if (!reader.State.Sequence.Initialized)
{
reader.InsertReferenceHeaderBeforeStartCode();
}
state.SeenGop = true;
state.Picture.Reset();
reader.GetAttribute(_timeCodeAttribute);
reader.GetFlag(Attribute.ClosedGop);
reader.GetFlag(Attribute.BrokenLink);
}
public void Parse(IMpeg2VideoReader reader, IResultNodeState resultState)
{
resultState.Name = Name;
}
