Dirac - A Video Codec

Created by the British Broadcasting Corporation.

dirac Namespace Reference

Definition of class AccessUnitByteIO. More...

Classes

class AccessUnitByteIO
A random access point within a Dirac bytestream. More...
class ByteIO
Class ByteIO - top-level class for reading/writing bytes to a stream. More...
class CodingParamsByteIO
Represents compressed sequence-parameter data used in an AccessUnit. More...
class ComponentByteIO
Frame component in Dirac bytestream format. More...
class DiracByteStats
Class DiracByteStats - for collecting statistics on aspects of the Dirac byte-stream. More...
class DiracByteStream
Represents a series of bytes in the Dirac bytestream specfication format. More...
class SourceParamsByteIO
Represents compressed source-parameter data contained in a sequence header. More...
class EndOfSequenceByteIO
Signals the end of a sequence in a Dirac-formatted bitstream. More...
class FrameByteIO
A compressed frame in Dirac bytestream format. More...
class MvDataByteIO
Represents compressed sequence-parameter data used in an AccessUnit. More...
class MvDataElementByteIO
Represents compressed sequence-parameter data used in an AccessUnit. More...
class ParseParamsByteIO
Represents compressed parse-parameter data used in an AccessUnit. More...
class ParseUnitByteIO
Represents a collection of data in a Dirac bytestream that can be parsed as a self-contained unit. More...
class SubbandByteIO
Subband Dirac-bytestream input/output. More...
class TransformByteIO
Represents compressed sequence-parameter data used in an AccessUnit. More...
class Context
class ArithCodecBase
class ArithCodec
Abstract binary arithmetic coding class. More...
class Range
Range type. More...
class OneDArray
A template class for one-dimensional arrays. More...
class TwoDArray
A template class for two-dimensional arrays. More...
class BandCodec
A general class for coding and decoding wavelet subband data. More...
class LFBandCodec
A class specially for coding the LF subbands. More...
class IntraDCBandCodec
A class specially for coding the DC subband of Intra frames. More...
class BandVLC
A general class for coding and decoding wavelet subband data using variable length coding. More...
class IntraDCBandVLC
A class specially for coding the DC subband of Intra frames. More...
class CommandLine
class FrameSort
Frame type Class. More...
class PicArray
A class for picture component data. More...
class CoeffArray
A class for picture component data. More...
class CostType
A structure for recording costs, particularly in quantisation. More...
class EntropyCorrector
A class used for correcting estimates of entropy. More...
class OLBParams
Parameters for overlapped block motion compensation. More...
class Rational
Class defining a rational number. More...
class ParseParams
Parameters relating to the complexity of encoder/decoder. More...
class SourceParams
Parameters relating to the source material being encoded/decoded. More...
class FrameParams
Parameters for initialising frame class objects. More...
class CodeBlocks
Structure to hold code block sizes when spatial partitioning is used. More...
class CodecParams
Parameters common to coder and decoder operation. More...
class EncoderParams
Parameters for the encoding process. More...
class DecoderParams
Parameters for the decoding process. More...
class QuantiserLists
Class for encapsulating quantiser data. More...
class DiracException
DiracException is the class which should be used for all exceptions within Dirac. More...
class Frame
A class for encapsulating all the data relating to a frame. More...
class FrameBuffer
Holds frames both for reference and to overcome reordering delay. More...
class MotionCompensator
Abstract Motion compensator class. More...
class MotionCompensator_Pixel
Pixel precision Motion compensator class. More...
class MotionCompensator_HalfPixel
Half Pixel precision Motion compensator class. More...
class MotionCompensator_QuarterPixel
Quarter Pixel precision Motion compensator class. More...
class MotionCompensator_EighthPixel
Eighth Pixel precision Motion compensator class. More...
class MotionVector
Motion vector class - just a pair. More...
class MvCostData
Class for recording costs derived in motion estimation. More...
class MvData
Class for all the motion vector data. More...
class MEData
Class for all the motion estimation data. More...
class SplitModeCodec
Codes and decodes the split mode. More...
class PredModeCodec
Codes and decodes the prediction modes. More...
class VectorElementCodec
Codes and decodes an array of motion vectors. More...
class DCCodec
Codes and decodes a set of DC values. More...
class StreamPicOutput
Class for outputting pictures. More...
class StreamFrameOutput
class StreamFieldOutput
class MemoryStreamOutput
class FileStreamOutput
class StreamPicInput
Picture input class. More...
class StreamFrameInput
class StreamFieldInput
class MemoryStreamInput
class FileStreamInput
Picture input class. More...
class UpConverter
Upconversion class. More...
class CodeBlock
Class for encapsulating metadata concerning a block of coefficients in a subband. More...
class Subband
Class encapsulating all the metadata relating to a wavelet subband. More...
class SubbandList
A class encapulating all the subbands produced by a transform. More...
class WaveletTransform
A class to do wavelet transforms. More...
class CompCompressor
Compress a frame component. More...
class FrameCompressor
Compress a single image frame. More...
class QualityMonitor
Class to monitor the quality of pictures and adjust coding parameters appropriately. More...
class QuantChooser
Choose a quantiser. More...
class FrameComplexity
class RateController
A clas for allocation the bits to each and every types of frames in a GOP. More...
class SequenceCompressor
Compresses a sequence of frames/fields from a stream. More...
class FrameSequenceCompressor
Compresses a sequence of frames from a stream. More...
class FieldSequenceCompressor
Compresses a sequence of fields from a stream. More...
class CompDecompressor
Compress a frame component. More...
class InputStreamBuffer
Input Stream Buffer Class. More...
class DiracParser
Dirac Stream Parser Class. More...
class FrameDecompressor
Compress a single image frame. More...
class SequenceDecompressor
Decompresses a sequence of frames from a stream. More...
class BlockMatcher
Class to do block matching. More...
class DownConverter
A class for fast downconversion of picture data. More...
class ModeDecider
Decides between macroblock and block prediction modes. More...
class SubpelRefine
The SubpelRefine class takes pixel-accurate motion vectors and refines them to 1/8-pixel accuracy. More...
class BlockDiffParams
A class encapsulating parameters for calculating a block difference value (a single instance of matching). More...
class BlockDiff
An abstract class for doing block difference calculations. More...
class PelBlockDiff
A class for doing block differences to pixel accuracy, inherited from BlockDiff. More...
class IntraBlockDiff
A class for calculating the difference between a block and its DC value (average). More...
class BiBlockDiff
A virtual class for bi-directional differences. More...
class BlockDiffUp
A virtual class for doing differences with sub-pixel vectors. More...
class BlockDiffHalfPel
A class for doing differences with half-pixel accurate vectors. More...
class BlockDiffQuarterPel
A class for doing differences with quarter-pixel accurate vectors. More...
class BlockDiffEighthPel
A class for doing differences with eighth-pixel accurate vectors. More...
class BiBlockHalfPel
A class for computing a bidirection difference for half-pel vectors. More...
class BiBlockQuarterPel
A class for computing a bidirection difference for quarter-pel vectors. More...
class BiBlockEighthPel
A class for computing a bidirection difference for eighth-pel vectors. More...
class MotionEstimator
Class to handle the whole motion estimation process. More...
class PixelMatcher

Typedefs

typedef short ValueType
Type of picture data (including motion compensated residuals).
typedef int CoeffType
Type of wavelet coefficient data (should be larger than ValueType).
typedef int CalcValueType
Type for performing calculations on ValueType and CoeffType. Should be >ValueType, >=CoeffType.
typedef MotionVector< int > MVector
MVector class is a vector of ints.
typedef MotionVector< int > ImageCoords
ImageCoords class is a vector of ints.
typedef TwoDArray< MVector > MvArray
MvArray is a two-D array of MVectors.
typedef TwoDArray< MotionVector<
float > > MvFloatArray
An array of float-based motion vectors for doing global motion calcs.
typedef std::vector< std::vector<
MVector > > CandidateList

Enumerations

enum StatType {
STAT_TOTAL_BYTE_COUNT = 0, STAT_MV_BYTE_COUNT, STAT_YCOMP_BYTE_COUNT, STAT_UCOMP_BYTE_COUNT,
STAT_VCOMP_BYTE_COUNT
}
enum ParseUnitType {
PU_SEQ_HEADER = 0, PU_FRAME, PU_END_OF_SEQUENCE, PU_AUXILIARY_DATA,
PU_PADDING_DATA, PU_CORE_FRAME, PU_LOW_DELAY_FRAME, PU_UNDEFINED
}
enum PredMode {
INTRA, REF1_ONLY, REF2_ONLY, REF1AND2,
UNDEFINED
}
Prediction modes for blocks. More...
enum CompSort { Y_COMP, U_COMP, V_COMP }
Types of picture component. More...
enum AddOrSub { ADD, SUBTRACT }
Addition or subtraction. More...
enum Direction { FORWARD, BACKWARD }
Forward or backward. More...
enum CtxAliases {
  SIGN0_CTX, SIGN_POS_CTX, SIGN_NEG_CTX, Z_FBIN1z_CTX,
  Z_FBIN1nz_CTX, Z_FBIN2_CTX, Z_FBIN3_CTX, Z_FBIN4_CTX,
  Z_FBIN5_CTX, Z_FBIN6plus_CTX, NZ_FBIN1z_CTX, NZ_FBIN1nz_CTX,
  NZ_FBIN2_CTX, NZ_FBIN3_CTX, NZ_FBIN4_CTX, NZ_FBIN5_CTX,
  NZ_FBIN6plus_CTX, INFO_CTX, BLOCK_SKIP_CTX, Q_OFFSET_FOLLOW_CTX,
  Q_OFFSET_INFO_CTX, Q_OFFSET_SIGN_CTX, TOTAL_COEFF_CTXS
}
Contexts used for coefficient coding. More...
enum MvCtxAliases {
  DC_FBIN1_CTX, DC_FBIN2plus_CTX, DC_INFO_CTX, DC_SIGN_CTX,
  MV_FBIN1_CTX, MV_FBIN2_CTX, MV_FBIN3_CTX, MV_FBIN4_CTX,
  MV_FBIN5plus_CTX, MV_INFO_CTX, MV_SIGN_CTX, PMODE_BIT0_CTX,
  PMODE_BIT1_CTX, MB_SPLIT_BIN1_CTX, MB_SPLIT_BIN2_CTX, MB_SPLIT_INFO_CTX,
  TOTAL_MV_CTXS
}
Contexts used for MV data coding. More...
enum DiracErrorCode {
  ERR_UNSUPPORTED_STREAM_DATA = 0, ERR_END_OF_STREAM, ERR_INVALID_VIDEO_FORMAT, ERR_INVALID_CHROMA_FORMAT,
  ERR_INVALID_FRAME_RATE, ERR_INVALID_SIGNAL_RANGE, ERR_INVALID_PIXEL_ASPECT_RATIO, ERR_INVALID_VIDEO_DEPTH,
  ERR_INVALID_MOTION_VECTOR_PRECISION, ERR_INVALID_INIT_DATA
}
Enumeration of Dirac-defined error codes. More...
enum DiracSeverityCode {
SEVERITY_NO_ERROR = 0, SEVERITY_WARNING, SEVERITY_FRAME_ERROR, SEVERITY_ACCESSUNIT_ERROR,
SEVERITY_SEQUENCE_ERROR, SEVERITY_TERMINATE
}
Error-severity states. More...
enum MvElement { HORIZONTAL, VERTICAL }
Horizontal or vertical. More...

Functions

template<class T> std::ostream & operator<< (std::ostream &stream, TwoDArray< T > &array)
A function for extracting array data.
template<class T> std::istream & operator>> (std::istream &stream, TwoDArray< T > &array)
A function for inserting array data.
VideoFormat IntToVideoFormat (int video_format)
Function to convert an integer to a valid VideoFormat.
ChromaFormat IntToChromaFormat (int chroma_format)
Function to convert an integer to a valid VideoFormat.
FrameRateType IntToFrameRateType (int frame_rate_idx)
Function to convert an integer to a valid FrameRate type.
PixelAspectRatioType IntToPixelAspectRatioType (int pix_asr_idx)
Function to convert an integer to a valid PixelAspectRatio type.
SignalRangeType IntToSignalRangeType (int signal_range_idx)
Function to convert an integer to a valid SignalRange type.
MVPrecisionType IntToMVPrecisionType (int mv_prec)
Function to convert an integer to a valid motion-vector precision type.
ValueType BChk (const ValueType &num, const ValueType &max)
A simple bounds checking function, very useful in a number of places.
void dirac_assert (const char *p_fname, int line_number, const char *p_mess)
void dirac_report (const char *p_fname, int line_number, const char *p_mess)
std::ostream & operator<< (std::ostream &dst, const DiracException &exception)
template<class T> std::ostream & operator<< (std::ostream &stream, MotionVector< T > &mv)
Overloaded operator<< for MotionVector class for output to stream.
template<class T> std::istream & operator>> (std::istream &stream, MotionVector< T > &mv)
Overloaded operator>> for MotionVector class for input from stream.
int Median (const int val1, const int val2, const int val3)
Return the median of 3 integers.
MVector MvMedian (const MVector &mv1, const MVector &mv2, const MVector &mv3)
Return the median of three motion vectors.
int Median (const std::vector< int > &val_list)
Return the median of a set of integers.
MVector MvMedian (const std::vector< MVector > &vect_list)
Return the median of a set of (up to 4) motion vectors.
MVector MvMean (const MVector &mv1, const MVector &mv2)
Return the mean of two motion vectors.
int Norm2 (const MVector &mv)
Return the squared length of a motion vector.
int Norm1 (const MVector &mv)
Return the sum of the lengths of a motion vector's componets.
unsigned int GetUMean (std::vector< unsigned int > &values)
Return the mean of a set of unsigned integer values.
int GetSMean (std::vector< int > &values)
Return the mean of a set of signed integer values.
void SetDefaultCodecParameters (CodecParams &cparams, FrameType ftype, unsigned int num_refs)
Sets default codec parameters - common to encoder and decoder.
void SetDefaultEncoderParameters (EncoderParams &encparams)
Sets default encoder parameters.
void SetDefaultSourceParameters (const VideoFormat &vf, SourceParams &sparams)
Sets default Source parameters.
void SetDefaultBlockParameters (OLBParams &bparams, const VideoFormat &video_format)
Sets default block parameters.
void SetDefaultBlockParameters (OLBParams &bparams, int pidx)
Sets default block parameters.
unsigned int BlockParametersIndex (const OLBParams &bparams)
Returns index of block parameters in Defaults table.
void SetDefaultTransformFilter (FrameType ftype, WltFilter &wf)
Sets the default Transform filter depending on frame type.
void AddNewVlist (CandidateList &vect_list, const MVector &mv, const int xr, const int yr)
Add a new motion vector list of neighbours of a vector to the set of lists.
void AddNewVlist (CandidateList &vect_list, const MVector &mv, const int xr, const int yr, const int step)
Add a new motion vector list to the set of lists for sub-pixel matching.
void AddNewVlistD (CandidateList &vect_list, const MVector &mv, const int xr, const int yr)
Add a new motion vector list of diagnonal neighbours of a vector to the set of lists.
void AddVect (CandidateList &vect_list, const MVector &mv, const int list_num)
Add a motion vector to the set of motion vector lists.
ValueType GetVar (const MVector &mv1, const MVector &mv2)
Get the (absolute) variation between two motion vectors.
ValueType GetVar (const std::vector< MVector > &pred_list, const MVector &mv)
Get the (absolute) variation between a motion vector and a list of motion vectors.

Typedef Documentation

typedef int dirac::CalcValueType

typedef std::vector< std::vector< MVector > > dirac::CandidateList

typedef int dirac::CoeffType

typedef MotionVector<int> dirac::ImageCoords

typedef TwoDArray<MVector> dirac::MvArray

typedef MotionVector<int> dirac::MVector

typedef TwoDArray< MotionVector<float> > dirac::MvFloatArray

typedef short dirac::ValueType

Enumeration Type Documentation

enum dirac::AddOrSub

Enumerator:

ADD
SUBTRACT

enum dirac::CompSort

Enumerator:

Y_COMP
U_COMP
V_COMP

enum dirac::CtxAliases

Enumerator:

SIGN0_CTX
SIGN_POS_CTX
SIGN_NEG_CTX
Z_FBIN1z_CTX
Z_FBIN1nz_CTX
Z_FBIN2_CTX
Z_FBIN3_CTX
Z_FBIN4_CTX
Z_FBIN5_CTX
Z_FBIN6plus_CTX
NZ_FBIN1z_CTX
NZ_FBIN1nz_CTX
NZ_FBIN2_CTX
NZ_FBIN3_CTX
NZ_FBIN4_CTX
NZ_FBIN5_CTX
NZ_FBIN6plus_CTX
INFO_CTX
BLOCK_SKIP_CTX
Q_OFFSET_FOLLOW_CTX
Q_OFFSET_INFO_CTX
Q_OFFSET_SIGN_CTX
TOTAL_COEFF_CTXS

enum dirac::DiracErrorCode

Enumerator:

ERR_UNSUPPORTED_STREAM_DATA
ERR_END_OF_STREAM
ERR_INVALID_VIDEO_FORMAT
ERR_INVALID_CHROMA_FORMAT
ERR_INVALID_FRAME_RATE
ERR_INVALID_SIGNAL_RANGE
ERR_INVALID_PIXEL_ASPECT_RATIO
ERR_INVALID_VIDEO_DEPTH
ERR_INVALID_MOTION_VECTOR_PRECISION
ERR_INVALID_INIT_DATA

enum dirac::DiracSeverityCode

Enumerator:

SEVERITY_NO_ERROR
SEVERITY_WARNING
SEVERITY_FRAME_ERROR
SEVERITY_ACCESSUNIT_ERROR
SEVERITY_SEQUENCE_ERROR
SEVERITY_TERMINATE

enum dirac::Direction

Enumerator:

FORWARD
BACKWARD

enum dirac::MvCtxAliases

Enumerator:

DC_FBIN1_CTX
DC_FBIN2plus_CTX
DC_INFO_CTX
DC_SIGN_CTX
MV_FBIN1_CTX
MV_FBIN2_CTX
MV_FBIN3_CTX
MV_FBIN4_CTX
MV_FBIN5plus_CTX
MV_INFO_CTX
MV_SIGN_CTX
PMODE_BIT0_CTX
PMODE_BIT1_CTX
MB_SPLIT_BIN1_CTX
MB_SPLIT_BIN2_CTX
MB_SPLIT_INFO_CTX
TOTAL_MV_CTXS

enum dirac::MvElement

Enumerator:

HORIZONTAL
VERTICAL

enum dirac::ParseUnitType

Enumerator:

PU_SEQ_HEADER
PU_FRAME
PU_END_OF_SEQUENCE
PU_AUXILIARY_DATA
PU_PADDING_DATA
PU_CORE_FRAME
PU_LOW_DELAY_FRAME
PU_UNDEFINED

enum dirac::PredMode

Enumerator:

INTRA
REF1_ONLY
REF2_ONLY
REF1AND2
UNDEFINED

enum dirac::StatType

Enumerator:

STAT_TOTAL_BYTE_COUNT
STAT_MV_BYTE_COUNT
STAT_YCOMP_BYTE_COUNT
STAT_UCOMP_BYTE_COUNT
STAT_VCOMP_BYTE_COUNT

Function Documentation

void dirac::AddNewVlist	(	CandidateList &	vect_list,
		const MVector &	mv,
		const int	xr,
		const int	yr,
		const int	step
	)

void dirac::AddNewVlist	(	CandidateList &	vect_list,
		const MVector &	mv,
		const int	xr,
		const int	yr
	)

void dirac::AddNewVlistD	(	CandidateList &	vect_list,
		const MVector &	mv,
		const int	xr,
		const int	yr
	)

void dirac::AddVect	(	CandidateList &	vect_list,
		const MVector &	mv,
		const int	list_num
	)

Add a motion vector to the set of motion vector lists, making sure it's not a duplicate.

ValueType dirac::BChk	(	const ValueType &	num,
		const ValueType &	max
	)			`[inline]`

unsigned int dirac::BlockParametersIndex ( const OLBParams & bparams )

Parameters:

bparams

Params object for getting index

void dirac::dirac_assert	(	const char *	p_fname,
		int	line_number,
		const char *	p_mess
	)

Print a message to standard error and abort if in debug mode

void dirac::dirac_report	(	const char *	p_fname,
		int	line_number,
		const char *	p_mess
	)

Print a message to standard error

int dirac::GetSMean ( std::vector< int > & values )

unsigned int dirac::GetUMean ( std::vector< unsigned int > & values )

ValueType dirac::GetVar	(	const std::vector< MVector > &	pred_list,
		const MVector &	mv
	)

Return the variation between a motion vector and a list of motion vectos, computed as the sum of absolute differences between the components of the vector and the median vector produced by the list of vectors

ValueType dirac::GetVar	(	const MVector &	mv1,
		const MVector &	mv2
	)

Return the variation between two motion vectors, computed as the sum of absolute differences of their components.

ChromaFormat dirac::IntToChromaFormat ( int chroma_format )

Parameters:

chroma_format

Integer corresponding to a format

Returns:: Valid chroma-format (returns formatNK if no valid format found)

FrameRateType dirac::IntToFrameRateType ( int frame_rate_idx )

Parameters:

frame_rate_idx

Integer corresponding to a frame-rate in the spec table

Returns:: Valid FrameRateType (returns FRAMERATE_UNDEFINED if no valid frame-rate found)

MVPrecisionType dirac::IntToMVPrecisionType ( int mv_prec )

Parameters:

mv_prec

Integer corresponding to a valid motion-vector precision

Returns:: Valid MVPrecisionType (returns SIGNAL_RANGE_UNDEFINED if no valid precision found)

PixelAspectRatioType dirac::IntToPixelAspectRatioType ( int pix_asr_idx )

Parameters:

pix_asr_idx

Integer corresponding to a pixel aspect ratio in the spec table

Returns:: Valid PixelAspectRatioType (returns PIXEL_ASPECT_RATIO_UNDEFINED if no valid pixel aspect ratio found)

SignalRangeType dirac::IntToSignalRangeType ( int signal_range_idx )

Parameters:

signal_range_idx

Integer corresponding to a signal-range in the spec table

Returns:: Valid SignalRangeType (returns SIGNAL_RANGE_UNDEFINED if no valid signal-ratio found)

VideoFormat dirac::IntToVideoFormat ( int video_format )

Parameters:

video_format

Integer corresponding to a format

Returns:: Valid video-format (returns VIDEO_FORMAT_UNDEFINED if no valid format found)

int dirac::Median ( const std::vector< int > & val_list )

int dirac::Median	(	const int	val1,
		const int	val2,
		const int	val3
	)

MVector dirac::MvMean	(	const MVector &	mv1,
		const MVector &	mv2
	)

MVector dirac::MvMedian ( const std::vector< MVector > & vect_list )

MVector dirac::MvMedian	(	const MVector &	mv1,
		const MVector &	mv2,
		const MVector &	mv3
	)

int dirac::Norm1 ( const MVector & mv ) [inline]

int dirac::Norm2 ( const MVector & mv ) [inline]

template<class T>

std::ostream& dirac::operator<<	(	std::ostream &	stream,
		MotionVector< T > &	mv
	)			`[inline]`

std::ostream& dirac::operator<<	(	std::ostream &	dst,
		const DiracException &	exception
	)

template<class T>

std::ostream& dirac::operator<<	(	std::ostream &	stream,
		TwoDArray< T > &	array
	)			`[inline]`

template<class T>

std::istream& dirac::operator>>	(	std::istream &	stream,
		MotionVector< T > &	mv
	)			`[inline]`

template<class T>

std::istream& dirac::operator>>	(	std::istream &	stream,
		TwoDArray< T > &	array
	)			`[inline]`

void dirac::SetDefaultBlockParameters	(	OLBParams &	bparams,
		int	pidx
	)

Parameters:

	bparams	Params object for setting defaults
	pidx	Index into Block Parameters table

void dirac::SetDefaultBlockParameters	(	OLBParams &	bparams,
		const VideoFormat &	video_format
	)

Parameters:

	bparams	Params object for setting defaults
	video_format	Video format

void dirac::SetDefaultCodecParameters	(	CodecParams &	cparams,
		FrameType	ftype,
		unsigned int	num_refs
	)

Parameters:

	cparams	Codec Params objects for setting defaults
	ftype	Frame type i,e, INTRA or INTER
	num_refs	Number of reference frames

void dirac::SetDefaultEncoderParameters ( EncoderParams & encparams )

Parameters:

encparams

Params objects for setting defaults

void dirac::SetDefaultSourceParameters	(	const VideoFormat &	vf,
		SourceParams &	sparams
	)

Parameters:

	vf	Video Format
	sparams	Params object for setting defaults

void dirac::SetDefaultTransformFilter	(	FrameType	ftype,
		WltFilter &	wf
	)

Parameters:

	ftype	Frame type i.e. intra or inter
	wf	WltFilter object for getting the default wavelet filter

© 2004 British Broadcasting Corporation. Dirac code licensed under the Mozilla Public License (MPL) Version 1.1.
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