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  3. FLinearTimecodeDecoder

FLinearTimecodeDecoder

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API > API/Plugins > API/Plugins/LinearTimecode

References

   
Module LinearTimecode
Header /Engine/Plugins/Media/LinearTimecode/Source/LinearTimecode/Public/LinearTimecodeDecoder.h
Include #include "LinearTimecodeDecoder.h"

Syntax

class FLinearTimecodeDecoder

Remarks

Process audio samples to extract Linear Timecode Signal

Variables

  Type Name Description
Protected variable bool bCurrent Helper to detect zero crossings/edges of the input signal.
Protected variable bool bFlip Indicates that we're expecting the second half of a logical 1.
Protected variable float Center Sample value to detect zero crossings/edges of the input signal.
Protected variable int32 Clock Counts number of samples since last edge.
Protected variable int32 Cycles Estimates number of samples for a logical 1 in the LTC stream.
Protected variable int32 FrameMax Keeps track of largest frame value received, helps estimate FrameRate.
Protected variable int32 FrameRate Tries to infer FrameRate based on frame value rollovers.
Public variable int32 MaxSamplesPerEdge Maximum allowable samples per edge in the signal. Helps filter out noise.
Public variable int32 MinSamplesPerEdge Minimum allowable samples per edge in the signal. Helps filter out noise.
Protected variable uint16[6] TimecodeBits Holds the stream to be decoded as bits come in.

Constructors

  Type Name Description
Public function   Public interface, methods

Functions

  Type Name Description
Protected function Const int32

AdjustCycles ( int32 InClock
)

 Tries to calculate the number of clocks per bit.
Protected function void

DecodeBitStream ( uint16* InBitStream,
EDecodePattern* InDecodePatern,
int32 InForward,
FDropTimecode& OutTimeCode
)

  
Protected function bool

DecodeFrame ( uint16* InBitStream,
FDropTimecode& OutTimeCode
)

  
Protected function Const bool

HasCompleteFrame ( uint16* InBitStream
)

  
Public function void

Reset ()

 Flush internal state of timecode reader
Public function bool

Sample ( float InSample,
FDropTimecode& OutTimeCode
)

 Analyze a single sample, looking for a time code pattern
Protected function Const void

ShiftAndInsert ( uint16* InBitStream,
bool InBit
)

 Add bit to decoded stream.

Classes

  Type Name Description
Protected struct EDecodePattern Used to extract timecode from bit stream  

Constants

Name Description
BackwardPattern  
ForwardPattern  

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