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tzxblock11abstract.inc
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tzxblock11abstract.inc
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// Copyright 2022-2024 Zoran Vučenović
// SPDX-License-Identifier: Apache-2.0
{$ifdef tzx_header_section}
TTzxBlock11abstract = class abstract (TTzxBlock)
strict protected
const
DefaultPilotHeaderPulsesNeeded = 8063;
DefaultPilotDataPulsesNeeded = 3223;
DefaultPilotTicksNeeded = 2168;
DefaultSync1TicksNeeded = 667;
DefaultSync2TicksNeeded = 735;
DefaultBitPulsesNeeded = 2;
DefaultBit0TicksNeeded = 855;
DefaultBit1TicksNeeded = 1710;
strict protected
PilotTicksNeeded: Integer;
Sync1TicksNeeded: Integer;
Sync2TicksNeeded: Integer;
BitPulsesNeeded: Integer;
Bit0TicksNeeded: Integer;
Bit1TicksNeeded: Integer;
UsedBitsInLastByte: Integer;
PauseAfterBlock: Integer;
FLen: Integer;
DataLen: Integer;
Data: PByte;
PilotPulsesNeeded: Integer;
PEnd: PByte;
strict private
UnusedBitsInLastByte: Integer;
P: PByte;
BitPosition: Integer;
TicksNeeded0: Int64;
PulsesNeeded: Integer;
TicksNeeded: Int64;
strict protected
function Details2: String; virtual;
public
constructor Create(ATapePlayer: TTapePlayer); override;
destructor Destroy; override;
{returns whole block length, without id byte}
function GetBlockLength: Integer; override;
function GetNextPulse(): Boolean; override;
procedure Start; override;
procedure Details(out S: String); override;
end;
{$else}
function TTzxBlock11abstract.Details2: String;
begin
Result := #13 + 'Used bits in last byte: ' + IntToStr(UsedBitsInLastByte);
end;
constructor TTzxBlock11abstract.Create(ATapePlayer: TTapePlayer);
begin
inherited Create(ATapePlayer);
PilotTicksNeeded := DefaultPilotTicksNeeded;
Sync1TicksNeeded := DefaultSync1TicksNeeded;
Sync2TicksNeeded := DefaultSync2TicksNeeded;
BitPulsesNeeded := DefaultBitPulsesNeeded;
Bit0TicksNeeded := DefaultBit0TicksNeeded;
Bit1TicksNeeded := DefaultBit1TicksNeeded;
UsedBitsInLastByte := 8;
Data := nil;
PauseAfterBlock := 1000;
FLen := 0;
PilotPulsesNeeded := 0;
PulsesNeeded := 0;
TicksNeeded := 0;
P := nil;
PEnd := nil;
BitPosition := 0;
end;
destructor TTzxBlock11abstract.Destroy;
begin
if Data <> nil then
Freemem(Data);
inherited Destroy;
end;
function TTzxBlock11abstract.GetBlockLength: Integer;
begin
Result := FLen;
end;
function TTzxBlock11abstract.GetNextPulse: Boolean;
procedure ToPause;
begin
if PauseAfterBlock > 0 then
FTapePlayer.StartPauseBlock(PauseAfterBlock);
State := TPlayState.psFinished;
TicksNeeded0 := 0;
end;
procedure GetNextDataBit;
begin
if (P < PEnd) or ((P = PEnd) and (BitPosition >= UnusedBitsInLastByte)) then begin
if ((P^ shr BitPosition) and 1) = 0 then
TicksNeeded0 := Bit0TicksNeeded
else
TicksNeeded0 := Bit1TicksNeeded;
PulsesNeeded := 2;
if BitPosition > 0 then
Dec(BitPosition)
else begin
BitPosition := 7;
Inc(P);
end;
end else
ToPause;
end;
var
ProcTicks: Int64;
begin
if State = TPlayState.psFinished then
Exit(False);
ProcTicks := GetCurrentTotalSpectrumTicks;
if ProcTicks >= TicksNeeded then begin
if State <> TPlayState.psStart then
FTapePlayer.ActiveBit := FTapePlayer.ActiveBit xor %01000000;
Dec(PulsesNeeded);
if PulsesNeeded = 0 then begin
case State of
TPlayState.psData:
GetNextDataBit;
otherwise
repeat
Inc(State);
case State of
TPlayState.psPilot:
begin
TicksNeeded0 := PilotTicksNeeded;
if TicksNeeded0 = 0 then begin
if (P = nil) and (PauseAfterBlock = 0) then begin
State := TPlayState.psFinished;
Exit(False);
end;
State := TPlayState.psSync2;
end;
PulsesNeeded := PilotPulsesNeeded;
end;
TPlayState.psSync1:
begin
TicksNeeded0 := Sync1TicksNeeded;
PulsesNeeded := 1;
end;
TPlayState.psSync2:
begin
TicksNeeded0 := Sync2TicksNeeded;
PulsesNeeded := 1;
end;
TPlayState.psData:
if P <> nil then
GetNextDataBit
else
ToPause;
otherwise
end;
until (TicksNeeded0 <> 0) or (State > TPlayState.psData);
end;
AdjustTicksIfNeeded(TicksNeeded0);
end;
TicksNeeded := ProcTicks + TicksNeeded0;
end;
Result := True;
end;
procedure TTzxBlock11abstract.Start;
begin
inherited Start;
State := TPlayState.psStart;
TicksNeeded0 := 0;
TicksNeeded := TicksNeeded.MinValue;
PulsesNeeded := 1;
UnusedBitsInLastByte := 8 - UsedBitsInLastByte;
P := Data;
BitPosition := 7;
end;
procedure TTzxBlock11abstract.Details(out S: String);
begin
S := 'Data length: ' + IntToStr(DataLen)
+ Details2
+ #13 + 'Pause after block: ' + IntToStr(PauseAfterBlock) + ' ms'
;
end;
{$endif}