uPESToTS.pas ( File view )

  • By sathex 2016-03-20
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			unit uPESToTS;

interface

uses SysUtils,Windows;

type TPESToTS = class(TObject)
  private
    mvarPID: WORD;
    mvarBuffer: PBYTEARRAY;
    mvarBufferSize: DWORD;
    mvarDataInBuffer: DWORD;
    mvarContinuityCounter: BYTE;
    mvarMAXBufferSize: DWORD;
    mvarBufferMustBeResetted: Boolean;
    mvarProcessedData: int64;
    mvarOffSet: DWORD;
    mvarProcessedBuffer: PBYTEARRAY;
    mvarProcessedBufferSize: DWORD;
    function HasPTS(SourcePos: DWORD): Boolean;
  protected
  public
    function AddToBuffer(PESPacket: PBYTEARRAY; Len:DWORD): Boolean;
    function GetTSData(var TSPointer: PBYTEARRAY; var Len: DWORD): Boolean;
    constructor Create(PID: WORD);
    Destructor Destroy(); override;
end;


implementation

{
 TPESToTS 
}

function TPESToTS.AddToBuffer(PESPacket: PBYTEARRAY; Len: DWORD): Boolean;
var
    NewPos: DWORD;
begin
    if ((mvarDataInBuffer+Len+184)> mvarMAXBufferSize) Then begin
        mvarBufferMustBeResetted:=true;
    end;
    if mvarBufferMustBeResetted Then begin
        Result:=false;
        Exit;
    end;
    if (mvarDataInBuffer+Len+184)>=mvarBufferSize Then begin
        //Try to make room
        if mvarDataInBuffer>368 Then begin
            NewPos:=0;
            move(Pointer(@mvarBuffer[mvarOffset])^,Pointer(@mvarBuffer[NewPos])^,mvarDataInBuffer-mvarOffSet);
            mvarDataInBuffer:=mvarDataInBuffer-mvarOffSet+NewPos;
            inc(mvarProcessedData,mvarOffSet-NewPos);
            mvarOffSet:=NewPos;
        end;
    end;
    if (mvarDataInBuffer+Len)>=mvarBufferSize Then begin
        //Try to make room reallocating buffer size
        ReallocMem(Pointer(mvarBuffer),mvarDataInBuffer+Len+184000);
        mvarBufferSize:=mvarDataInBuffer+Len+184000;
    end;
    move(PESPacket^,Pointer(@mvarBuffer[mvarDataInBuffer])^,Len);
    inc(mvarDataInBuffer,Len);
    Result:=true;
end;

constructor TPESToTS.Create(PID: WORD);
begin
    mvarPID:=PID;
    mvarBuffer:=nil;
    mvarBufferSize:=0;
    mvarDataInBuffer:=0;
    mvarOffSet:=0;
    mvarBufferMustBeResetted:=False;
    mvarProcessedBuffer:=nil;
    mvarProcessedBufferSize:=0;
    mvarMAXBufferSize:=$FFFFFFFF; //Unlimited...
    mvarContinuityCounter:=0;
end;

destructor TPESToTS.Destroy;
begin
    if mvarBuffer<>nil Then begin
        FreeMem(mvarBuffer);
    end;
    if mvarProcessedBuffer<>nil Then begin
        FreeMem(mvarProcessedBuffer);
    end;
end;

function TPESToTS.GetTSData(var TSPointer: PBYTEARRAY;
  var Len: DWORD): Boolean;
var
    i: integer;
    TargetSize: DWORD;
    TargetPos: DWORD;
    SourcePos: DWORD;
    FinalBytes: DWORD;
begin
    if mvarDataInBuffer=0 Then begin
        Result:=false;
        Exit;
    end;
    FinalBytes:=(mvarDataInBuffer-mvarOffSet) mod 184;
    i:=(mvarDataInBuffer-mvarOffSet) div 184;
    if  FinalBytes>0 Then begin
        inc(i);
    end;
    TargetSize:=i*188+188; //188 one possible extra packet
    if mvarProcessedBufferSize<TargetSize Then begin
        mvarProcessedBuffer:=ReallocMemory(mvarProcessedBuffer,TargetSize);
        mvarProcessedBufferSize:=TargetSize;
    end;
    TargetPos:=0;
    SourcePos:=mvarOffSet;
    while (SourcePos<mvarDataInBuffer) do begin
        FinalBytes:=mvarDataInBuffer-SourcePos;
        mvarProcessedBuffer[TargetPos]:=$47; //Sync Byte
        mvarProcessedBuffer[TargetPos+1]:=(mvarPID and $1FFF) shr 8;
        if SourcePos=mvarOffSet then begin
            mvarProcessedBuffer[TargetPos+1]:=mvarProcessedBuffer[TargetPos+1] or 64; //Payload Unit Start Indicator
        end;
        mvarProcessedBuffer[TargetPos+2]:=(mvarPID and $FF);
        //Adaptation field testing in different remaining bytes situations...
        if FinalBytes<183 Then begin
            mvarProcessedBuffer[TargetPos+3]:=(mvarContinuityCounter and $0F) or $30; // Continuity with adaptation field
            inc(TargetPos,4);
            mvarProcessedBuffer[TargetPos]:=182-FinalBytes+1;
            inc(TargetPos);
            mvarProcessedBuffer[TargetPos]:=0; //Adapt flags...
            inc(TargetPos);
            for i :
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