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Adds necessary interface to inherit a CPC tape-speed byte.

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This commit is contained in:
Thomas Harte 2021-03-12 18:43:20 -05:00
parent cd215ef521
commit 064fe7658c
2 changed files with 22 additions and 4 deletions
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19
Storage/Tape/Parsers/Spectrum.cpp
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@ -82,10 +82,7 @@ void Parser::process_pulse(const Storage::Tape::Tape::Pulse &pulse) {
case MachineType::AmstradCPC:
// CPC: pilot tone is length of bit 1; bit 0 is half that.
// So no more detecting formal pilot waves.
is_one_ = mean * 0.75f;
too_long_ = mean * 1.0f / 0.75f;
too_short_ = is_one_ * 0.5f;
is_pilot_ = too_long_;
set_cpc_one_zero_boundary(mean * 0.75f);
break;
case MachineType::Enterprise:
@ -132,6 +129,20 @@ void Parser::process_pulse(const Storage::Tape::Tape::Pulse &pulse) {
push_wave(t_states > is_one_ ? WaveType::One : WaveType::Zero);
}
void Parser::set_cpc_read_speed(uint8_t speed) {
// This may not be exactly right; I wish there were more science here but
// instead it's empirical based on tape speed versus value stored plus
// a guess as to where the CPC puts the dividing line.
set_cpc_one_zero_boundary(float(speed) * 14.35f);
}
void Parser::set_cpc_one_zero_boundary(float boundary) {
is_one_ = boundary;
too_long_ = is_one_ * 16.0f / 9.0f;
too_short_ = is_one_ * 0.5f;
is_pilot_ = too_long_;
}
void Parser::inspect_waves(const std::vector<Storage::Tape::ZXSpectrum::WaveType> &waves) {
switch(waves[0]) {
// Gap and Pilot map directly.

7
Storage/Tape/Parsers/Spectrum.hpp
View File

@ -63,6 +63,11 @@ class Parser: public Storage::Tape::PulseClassificationParser<WaveType, SymbolTy
};
Parser(MachineType);
/*!
Calibrates the expected data speed using a value in the CPC's native tape-speed measurement scale.
*/
void set_cpc_read_speed(uint8_t);
/*!
Finds the next block from the tape, if any.
@ -117,6 +122,8 @@ class Parser: public Storage::Tape::PulseClassificationParser<WaveType, SymbolTy
std::array<float, 8> calibration_pulses_;
size_t calibration_pulse_pointer_ = 0;
void set_cpc_one_zero_boundary(float);
};
}