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Clarified meaning of is_high_ flag and ensured it is honoured properly.

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This commit is contained in:
Thomas Harte 2017-07-17 21:36:05 -04:00
parent 130d598ec9
commit 35296017b5
2 changed files with 8 additions and 7 deletions
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13
Storage/Tape/Formats/TZX.cpp
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@ -16,7 +16,7 @@ const unsigned int StandardTZXClock = 3500000;
TZX::TZX(const char *file_name) :
Storage::FileHolder(file_name),
is_high_(false) {
next_is_high_(false) {
// Check for signature followed by a 0x1a
char identifier[7];
@ -36,6 +36,7 @@ TZX::TZX(const char *file_name) :
void TZX::virtual_reset() {
clear();
set_is_at_end(false);
next_is_high_ = false;
fseek(file_, 0x0a, SEEK_SET);
}
@ -136,9 +137,9 @@ void TZX::get_generalised_segment(uint32_t output_symbols, uint8_t max_pulses_pe
// Mutate initial output level.
switch(symbol.flags & 3) {
case 0: break;
case 1: is_high_ ^= true; break;
case 2: is_high_ = true; break;
case 3: is_high_ = false; break;
case 1: next_is_high_ ^= true; break;
case 2: next_is_high_ = false; break;
case 3: next_is_high_ = true; break;
}
// Output waves.
@ -151,8 +152,8 @@ void TZX::get_generalised_segment(uint32_t output_symbols, uint8_t max_pulses_pe
}
void TZX::post_pulse(unsigned int length) {
is_high_ ^= true;
emplace_back(is_high_ ? Tape::Pulse::High : Tape::Pulse::Low, Storage::Time(length, StandardTZXClock));
emplace_back(next_is_high_ ? Tape::Pulse::High : Tape::Pulse::Low, Storage::Time(length, StandardTZXClock));
next_is_high_ ^= true;
}
void TZX::get_standard_speed_data_block() {

2
Storage/Tape/Formats/TZX.hpp
View File

@ -35,7 +35,7 @@ class TZX: public PulseQueuedTape, public Storage::FileHolder {
void virtual_reset();
void get_next_pulses();
bool is_high_;
bool next_is_high_;
void get_standard_speed_data_block();
void get_turbo_speed_data_block();