private static void ReadPauseOrStopTheTape(BinaryReader fileReader, PauseOrStopTheTape pauseOrStopTheTape)
{
pauseOrStopTheTape.PauseInMs = fileReader.ReadUInt16();
}
private static TzxDataBlock ReadTzxDataBlock(BinaryReader fileReader)
{
TzxDataBlock resultDataBlock = null;
byte id = fileReader.ReadByte();
TzxDataBlockType dataBlockType = TzxDataBlock.GetTZXDataBlockTypeFromID(id);
switch (dataBlockType)
{
// ID 10 - Standard Speed Data Block
case TzxDataBlockType.StandardSpeedDataBlock:
resultDataBlock = new StandardSpeedDataBlock();
ReadStandardSpeedDataBlock(fileReader, (StandardSpeedDataBlock)resultDataBlock);
break;
// ID 11 - Turbo Speed Data Block
case TzxDataBlockType.TurboSpeedDataBlock:
resultDataBlock = new TurboSpeedDataBlock();
ReadTurboSpeedDataBlock(fileReader, (TurboSpeedDataBlock)resultDataBlock);
break;
// ID 12 - Pure Tone
case TzxDataBlockType.PureTone:
resultDataBlock = new PureTone();
ReadPureTone(fileReader, (PureTone)resultDataBlock);
break;
// ID 13 - Pulse sequence
case TzxDataBlockType.PulseSequence:
resultDataBlock = new PulseSequence();
ReadPulseSequence(fileReader, (PulseSequence)resultDataBlock);
break;
// ID 14 - Pure Data Block
case TzxDataBlockType.PureDataBlock:
resultDataBlock = new PureDataBlock();
ReadPureDataBlock(fileReader, (PureDataBlock)resultDataBlock);
break;
// ID 15 - Direct Recording
case TzxDataBlockType.DirectRecording:
resultDataBlock = new DirectRecording();
ReadDirectRecording(fileReader, (DirectRecording)resultDataBlock);
break;
// ID 20 - Pause (silence) or 'Stop the Tape' command
case TzxDataBlockType.PauseOrStopTheTape:
resultDataBlock = new PauseOrStopTheTape();
ReadPauseOrStopTheTape(fileReader, (PauseOrStopTheTape)resultDataBlock);
break;
// ID 21 - Group start
case TzxDataBlockType.GroupStart:
resultDataBlock = new GroupStart();
ReadGroupStart(fileReader, (GroupStart)resultDataBlock);
break;
// ID 22 - Group end
case TzxDataBlockType.GroupEnd:
resultDataBlock = new GroupEnd();
break;
// ID 30 - Text description
case TzxDataBlockType.TextDescription:
resultDataBlock = new TextDescription();
ReadTextDescription(fileReader, (TextDescription)resultDataBlock);
break;
// ID 32 - Archive info
case TzxDataBlockType.ArchiveInfo:
resultDataBlock = new ArchiveInfo();
ReadArchiveInfo(fileReader, (ArchiveInfo)resultDataBlock);
break;
default:
throw new NotImplementedException("TZX data block ID " + id.ToString("X") + " is not yet implemented");
}
return(resultDataBlock);
}
public static TzxFile ReadTzxFile(Stream inputStream, string fileName)
{
TzxFile resultFile = new TzxFile(fileName);
using (BinaryReader fileReader = new BinaryReader(inputStream, Encoding.GetEncoding("ISO-8859-1")))
{
string signature = Encoding.GetEncoding("ISO-8859-1").GetString(fileReader.ReadBytes(7));
if (signature != "ZXTape!")
{
throw new InvalidDataException("The signature of the file does not match the standard TZX file format");
}
else
{
resultFile.Signature = signature;
}
resultFile.EndOfTextFileMarker = fileReader.ReadByte();
resultFile.MajorRevisionNumber = fileReader.ReadByte();
resultFile.MinorRevisionNumber = fileReader.ReadByte();
TapeSection currentGroupSection = null;
while (fileReader.PeekChar() >= 0)
{
TzxDataBlock tzxBlock = ReadTzxDataBlock(fileReader);
resultFile.DataBlocks.Add(tzxBlock);
switch (tzxBlock.Type)
{
case TzxDataBlockType.StandardSpeedDataBlock:
case TzxDataBlockType.TurboSpeedDataBlock:
case TzxDataBlockType.PureTone:
case TzxDataBlockType.PulseSequence:
case TzxDataBlockType.PureDataBlock:
case TzxDataBlockType.DirectRecording:
TapeSection section = new TapeSection(tzxBlock);
if (currentGroupSection == null)
{
resultFile.Sections.Add(section);
}
else
{
foreach (TapeSoundSequence soundSequence in section.SoundSequences)
{
currentGroupSection.SoundSequences.Add(soundSequence);
}
}
break;
case TzxDataBlockType.PauseOrStopTheTape:
PauseOrStopTheTape pauseBlock = (PauseOrStopTheTape)tzxBlock;
if (pauseBlock.PauseInMs > 0)
{
section = new TapeSection(tzxBlock);
if (currentGroupSection == null)
{
resultFile.Sections.Add(section);
}
else
{
foreach (TapeSoundSequence soundSequence in section.SoundSequences)
{
currentGroupSection.SoundSequences.Add(soundSequence);
}
}
}
break;
case TzxDataBlockType.TextDescription:
TextDescription descriptionBlock = (TextDescription)tzxBlock;
resultFile.Description += descriptionBlock.Text;
break;
case TzxDataBlockType.ArchiveInfo:
ArchiveInfo archiveInfo = (ArchiveInfo)tzxBlock;
resultFile.Description += archiveInfo.ToString();
break;
case TzxDataBlockType.GroupStart:
currentGroupSection = new TapeSection(tzxBlock);
break;
case TzxDataBlockType.GroupEnd:
foreach (TapeSoundSequence soundSequence in currentGroupSection.SoundSequences)
{
currentGroupSection.Duration += soundSequence.Duration;
}
resultFile.Sections.Add(currentGroupSection);
currentGroupSection = null;
break;
}
}
}
TapeSection lastSection = resultFile.Sections[resultFile.Sections.Count - 1];
TapeSoundSequence lastSoundSequence = lastSection.SoundSequences[lastSection.SoundSequences.Count - 1];
if (lastSoundSequence.GetType() != typeof(PauseSequence))
{
lastSection.SoundSequences.Add(new PauseSequence("End of tape", 1));
}
foreach (TapeSection section in resultFile.Sections)
{
resultFile.Duration += section.Duration;
}
return(resultFile);
}
public TapeSection(TzxDataBlock tzxBlock)
{
switch (tzxBlock.Type)
{
// ID 10 - Standard Speed Data Block
// PILOT tone :
// - number of pulses : 8063 header (flag<128), 3223 data (flag>=128)
// - pulse length : 2168
// First SYNC pulse :
// - pulse length : 667
// Second SYNC pulse :
// - pulse length : 735
// DATA :
// - length of ZERO bit pulse : 855
// - length of ONE bit pulse : 1710
// Pause after this block (ms.) {1000}
case TzxDataBlockType.StandardSpeedDataBlock:
StandardSpeedDataBlock standardDataBlock = (StandardSpeedDataBlock)tzxBlock;
// PILOT tone
if (standardDataBlock.TapeDataBlock.Flag < 128)
{
_soundSequences.Add(new ToneSequence("Pilot tone", 8063, 2168));
}
else
{
_soundSequences.Add(new ToneSequence("Pilot tone", 3223, 2168));
}
// First and Second SYNC pulse
_soundSequences.Add(new PulsesSequence("Sync pulses", new ushort[] { 667, 735 }));
// DATA
_soundSequences.Add(new DataSequence("Data", standardDataBlock.TapeDataBlock.TapeData, 855, 1710, 8));
// Pause
if (standardDataBlock.PauseInMs > 0)
{
_soundSequences.Add(new PauseSequence("Pause", standardDataBlock.PauseInMs));
}
break;
// ID 11 - Turbo Speed Data Block
// PILOT tone :
// - number of pulses
// - pulse length
// First SYNC pulse :
// - pulse length
// Second SYNC pulse :
// - pulse length
// DATA :
// - length of ZERO bit pulse
// - length of ONE bit pulse
// Pause after this block (ms.)
case TzxDataBlockType.TurboSpeedDataBlock:
TurboSpeedDataBlock turboDataBlock = (TurboSpeedDataBlock)tzxBlock;
// PILOT tone
_soundSequences.Add(new ToneSequence("Pilot tone", turboDataBlock.PilotTonePulseCount, turboDataBlock.PilotTonePulseLength));
// First and Second SYNC pulse
_soundSequences.Add(new PulsesSequence("Sync pulses", new ushort[] { turboDataBlock.FirstSyncPulseLength, turboDataBlock.SecondSyncPulseLength }));
// DATA
_soundSequences.Add(new DataSequence("Data", turboDataBlock.TapeDataBlock.TapeData, turboDataBlock.ZeroBitPulseLength, turboDataBlock.OneBitPulseLength, turboDataBlock.UsedBitsOfTheLastByte));
// Pause
if (turboDataBlock.PauseInMs > 0)
{
_soundSequences.Add(new PauseSequence("Pause", turboDataBlock.PauseInMs));
}
break;
// ID 12 - Pure Tone
// Length of one pulse in T-states
// Number of pulses
case TzxDataBlockType.PureTone:
PureTone toneBlock = (PureTone)tzxBlock;
_soundSequences.Add(new ToneSequence("Pure tone", toneBlock.PulseCount, toneBlock.LengthOfOnePulse));
break;
// ID 13 - Pulse sequence
// Number of pulses
// Table of pulses' lengths
case TzxDataBlockType.PulseSequence:
PulseSequence pulseBlock = (PulseSequence)tzxBlock;
_soundSequences.Add(new PulsesSequence("Pulse sequence", pulseBlock.PulsesLengths));
break;
// ID 14 - Pure Data Block
// DATA : Length of ZERO bit pulse / Length of ONE bit pulse
// Pause after this block (ms.)
case TzxDataBlockType.PureDataBlock:
PureDataBlock dataBlock = (PureDataBlock)tzxBlock;
// DATA
_soundSequences.Add(new DataSequence("Pure data", dataBlock.TapeDataBlock.TapeData, dataBlock.ZeroBitPulseLength, dataBlock.OneBitPulseLength, dataBlock.UsedBitsOfTheLastByte));
// Pause
if (dataBlock.PauseInMs > 0)
{
_soundSequences.Add(new PauseSequence("Pause", dataBlock.PauseInMs));
}
break;
// ID 15 - Direct Recording
// Number of T-states per sample (bit of data). When creating a 'Direct recording' block please stick to the standard sampling frequencies of 22050 or 44100 Hz. This will ensure correct playback when using PC's soundcards.
// Pause after this block in milliseconds (ms.)
case TzxDataBlockType.DirectRecording:
DirectRecording samplesBlock = (DirectRecording)tzxBlock;
_soundSequences.Add(new SamplesSequence("Samples", samplesBlock.BitStream, samplesBlock.TStatesPerSample, samplesBlock.UsedBitsOfTheLastByte));
if (samplesBlock.PauseInMs > 0)
{
_soundSequences.Add(new PauseSequence("Pause", samplesBlock.PauseInMs));
}
break;
// ID 20 - Pause (silence) or 'Stop the Tape' command
// Pause duration (ms.)
// This will make a silence (low amplitude level (0)) for a given time in milliseconds. If the value is 0 then the emulator or utility should (in effect) STOP THE TAPE, i.e. should not continue loading until the user or emulator requests it.
case TzxDataBlockType.PauseOrStopTheTape:
PauseOrStopTheTape pauseBlock = (PauseOrStopTheTape)tzxBlock;
if (pauseBlock.PauseInMs > 0)
{
_soundSequences.Add(new PauseSequence("Pause", pauseBlock.PauseInMs));
}
break;
case TzxDataBlockType.GroupStart:
case TzxDataBlockType.GroupEnd:
case TzxDataBlockType.TextDescription:
case TzxDataBlockType.ArchiveInfo:
// Documentation only, ignore these blocks at runtime
break;
default:
throw new NotSupportedException("Tzx file block type " + tzxBlock.Type.ToString() + " is not yet supported");
}
ComputeDuration();
Label = GetSectionLabel(tzxBlock) + " [" + Math.Round(Duration / 1000f) + " sec]";
}
private static TzxDataBlock ReadTzxDataBlock(BinaryReader fileReader)
{
TzxDataBlock resultDataBlock = null;
byte id = fileReader.ReadByte();
TzxDataBlockType dataBlockType = TzxDataBlock.GetTZXDataBlockTypeFromID(id);
switch (dataBlockType)
{
// ID 10 - Standard Speed Data Block
case TzxDataBlockType.StandardSpeedDataBlock:
resultDataBlock = new StandardSpeedDataBlock();
ReadStandardSpeedDataBlock(fileReader, (StandardSpeedDataBlock)resultDataBlock);
break;
// ID 11 - Turbo Speed Data Block
case TzxDataBlockType.TurboSpeedDataBlock:
resultDataBlock = new TurboSpeedDataBlock();
ReadTurboSpeedDataBlock(fileReader, (TurboSpeedDataBlock)resultDataBlock);
break;
// ID 12 - Pure Tone
case TzxDataBlockType.PureTone:
resultDataBlock = new PureTone();
ReadPureTone(fileReader, (PureTone)resultDataBlock);
break;
// ID 13 - Pulse sequence
case TzxDataBlockType.PulseSequence:
resultDataBlock = new PulseSequence();
ReadPulseSequence(fileReader, (PulseSequence)resultDataBlock);
break;
// ID 14 - Pure Data Block
case TzxDataBlockType.PureDataBlock:
resultDataBlock = new PureDataBlock();
ReadPureDataBlock(fileReader, (PureDataBlock)resultDataBlock);
break;
// ID 15 - Direct Recording
case TzxDataBlockType.DirectRecording:
resultDataBlock = new DirectRecording();
ReadDirectRecording(fileReader, (DirectRecording)resultDataBlock);
break;
// ID 20 - Pause (silence) or 'Stop the Tape' command
case TzxDataBlockType.PauseOrStopTheTape:
resultDataBlock = new PauseOrStopTheTape();
ReadPauseOrStopTheTape(fileReader, (PauseOrStopTheTape)resultDataBlock);
break;
// ID 21 - Group start
case TzxDataBlockType.GroupStart:
resultDataBlock = new GroupStart();
ReadGroupStart(fileReader, (GroupStart)resultDataBlock);
break;
// ID 22 - Group end
case TzxDataBlockType.GroupEnd:
resultDataBlock = new GroupEnd();
break;
// ID 30 - Text description
case TzxDataBlockType.TextDescription:
resultDataBlock = new TextDescription();
ReadTextDescription(fileReader, (TextDescription)resultDataBlock);
break;
// ID 32 - Archive info
case TzxDataBlockType.ArchiveInfo:
resultDataBlock = new ArchiveInfo();
ReadArchiveInfo(fileReader, (ArchiveInfo)resultDataBlock);
break;
default:
throw new NotImplementedException("TZX data block ID "+ id.ToString("X") + " is not yet implemented");
}
return resultDataBlock;
}
private static void ReadPauseOrStopTheTape(BinaryReader fileReader, PauseOrStopTheTape pauseOrStopTheTape)
{
pauseOrStopTheTape.PauseInMs = fileReader.ReadUInt16();
}