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tzxblock13.inc
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tzxblock13.inc
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// Copyright 2022-2024 Zoran Vučenović
// SPDX-License-Identifier: Apache-2.0
{$ifdef tzx_header_section}
{ TTzxBlock13 }
TTzxBlock13 = class (TTzxBlock)
strict private
FLen: Integer;
NumOfPulses: Integer; // pulses needed
PulsesLengths: array of Integer;
TicksNeeded: Int64;
CurrentPulseNumber: Integer;
FDetails: String;
FDetailsFilled: Boolean;
public
constructor Create(ATapePlayer: TTapePlayer); override;
class function GetBlockId: DWord; override;
{returns whole block length, without id byte}
function GetBlockLength: Integer; override;
function LoadBlock(const Stream: TStream): Boolean; override;
class function GetBlockDescription: String; override;
function GetNextPulse(): Boolean; override;
procedure Start; override;
procedure Details(out S: String); override;
end;
{$else}
constructor TTzxBlock13.Create(ATapePlayer: TTapePlayer);
begin
inherited Create(ATapePlayer);
FDetailsFilled := False;
FLen := 0;
NumOfPulses := 0;
SetLength(PulsesLengths, 0);
end;
class function TTzxBlock13.GetBlockId: DWord;
begin
Result := $13;
end;
function TTzxBlock13.GetBlockLength: Integer;
begin
Result := FLen;
end;
function TTzxBlock13.LoadBlock(const Stream: TStream): Boolean;
var
I: Integer;
B: Byte;
W: Word;
begin
Result := False;
FDetailsFilled := False;
if Stream.Size > Stream.Position then begin
if Stream.Read(B{%H-}, 1) = 1 then begin
NumOfPulses := B;
FLen := NumOfPulses * 2 + 1;
Result := NumOfPulses = 0;
if not Result then begin
if Stream.Size - FLen >= Stream.Position - 1 then begin
SetLength(PulsesLengths, NumOfPulses);
I := 0;
while (I < NumOfPulses) and (Stream.Read(W{%H-}, 2) = 2) do begin
W := LEtoN(W);
PulsesLengths[I] := W;
Inc(I);
end;
Result := I = NumOfPulses;
end;
end;
end;
end;
end;
class function TTzxBlock13.GetBlockDescription: String;
begin
Result := 'Pulse sequence';
end;
function TTzxBlock13.GetNextPulse: Boolean;
var
ProcTicks: Int64;
TicksNeeded0: 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;
if CurrentPulseNumber < NumOfPulses then begin
TicksNeeded0 := PulsesLengths[CurrentPulseNumber];
AdjustTicksIfNeeded(TicksNeeded0);
TicksNeeded := ProcTicks + TicksNeeded0;
State := TPlayState.psPilot;
end else begin
State := TPlayState.psFinished;
end;
Inc(CurrentPulseNumber);
end;
Result := True;
end;
procedure TTzxBlock13.Start;
begin
inherited Start;
State := TPlayState.psStart;
TicksNeeded := TicksNeeded.MinValue;
CurrentPulseNumber := 0;
if NumOfPulses = 0 then
State := TPlayState.psFinished;
end;
procedure TTzxBlock13.Details(out S: String);
procedure FillDetails;
const
MaxLines = 5;
MaxPulsesInFirstLine = 8;
MaxPulsesInLine = 10;
var
I: Integer;
N: Integer;
K: Integer;
M: Integer;
S2: String;
begin
FDetails := 'Number of pulses: ' + NumOfPulses.ToString;
if NumOfPulses > 0 then begin
K := MaxPulsesInFirstLine;
M := MaxPulsesInLine;
if NumOfPulses > K + (MaxLines - 1) * M then begin
N := K + (MaxLines - 2) * M;
S2 := #13 + Format(' ... (and %d more)', [NumOfPulses - N]);
end else begin
S2 := '';
repeat
I := NumOfPulses + M - K;
N := I mod M;
if (N = 0) or (I div M >= M - N) then
Break;
Dec(K);
Dec(M);
until False;
N := NumOfPulses;
end;
FDetails := FDetails + #13 + 'Pulse lengths: ' + PulsesLengths[0].ToString;
for I := 1 to N - 1 do begin
Dec(K);
if K = 0 then begin
FDetails := FDetails + ',' + #13 + ' ';
K := M;
end else
FDetails := FDetails + ', ';
FDetails := FDetails + PulsesLengths[I].ToString;
end;
FDetails := FDetails + S2;
end;
FDetailsFilled := True;
end;
begin
if not FDetailsFilled then
FillDetails;
S := FDetails;
end;
{$endif}