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Adjusted to allow inspect_waves to swallow a gap before a bit if necessary, increasing the opportunities for its call.

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This commit is contained in:
Thomas Harte 2017-06-11 18:31:09 -04:00
parent e5aea632ee
commit 2c6414ce11
1 changed files with 10 additions and 4 deletions
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14
Storage/Tape/Parsers/ZX8081.cpp
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@ -56,9 +56,15 @@ void Parser::inspect_waves(const std::vector<WaveType> &waves) {
}
if(waves.size() >= 9) {
size_t wave_offset = 0;
// If the very first thing is a gap, swallow it.
if(waves[0] == WaveType::Gap) {
wave_offset = 1;
}
// Count the number of pulses at the start of this vector
size_t number_of_pulses = 0;
while(waves[number_of_pulses] == WaveType::Pulse && number_of_pulses < waves.size()) {
while(waves[number_of_pulses + wave_offset] == WaveType::Pulse && number_of_pulses < waves.size()) {
number_of_pulses++;
}
@ -67,13 +73,13 @@ void Parser::inspect_waves(const std::vector<WaveType> &waves) {
if(number_of_pulses > 17 || number_of_pulses < 7) {
push_symbol(SymbolType::Unrecognised, 1);
}
else if(number_of_pulses < waves.size() &&
(waves[number_of_pulses] == WaveType::LongGap || waves[number_of_pulses] == WaveType::Gap)) {
else if(number_of_pulses + wave_offset < waves.size() &&
(waves[number_of_pulses + wave_offset] == WaveType::LongGap || waves[number_of_pulses + wave_offset] == WaveType::Gap)) {
// A 1 is 18 up/down waves, a 0 is 8. But the final down will be indistinguishable from
// the gap that follows the bit due to the simplified "high is high, everything else is low"
// logic applied to pulse detection. So those two things will merge. Meaning we're looking for
// 17 and/or 7 pulses.
int gaps_to_swallow = (waves[number_of_pulses] == WaveType::Gap) ? 1 : 0;
int gaps_to_swallow = (int)wave_offset + ((waves[number_of_pulses + wave_offset] == WaveType::Gap) ? 1 : 0);
switch(number_of_pulses) {
case 17: push_symbol(SymbolType::One, 17 + gaps_to_swallow); break;
case 7: push_symbol(SymbolType::Zero, 7 + gaps_to_swallow); break;