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Threw in 300-baud support. Why not?

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This commit is contained in:
Thomas Harte 2016-09-08 07:48:20 -04:00
parent 3e925e80a3
commit 01e5dae512
2 changed files with 24 additions and 14 deletions
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37
Storage/Tape/Formats/TapeUEF.cpp
View File

@ -69,7 +69,8 @@ static int gzget32(gzFile file)
UEF::UEF(const char *file_name) :
_time_base(1200),
_is_at_end(false),
_pulse_pointer(0)
_pulse_pointer(0),
_is_300_baud(false)
{
_file = gzopen(file_name, "rb");
@ -166,7 +167,7 @@ void UEF::parse_next_tape_chunk()
case 0x0114: queue_security_cycles(); break;
case 0x0104: queue_defined_data(chunk_length); break;
case 0x113: // change of base rate
case 0x0113: // change of base rate
{
// TODO: something smarter than just converting this to an int
float new_time_base = gzgetfloat(_file);
@ -174,6 +175,13 @@ void UEF::parse_next_tape_chunk()
}
break;
case 0x0117:
{
int baud_rate = gzget16(_file);
_is_300_baud = (baud_rate == 300);
}
break;
default:
printf("!!! Skipping %04x\n", chunk_id);
break;
@ -335,26 +343,27 @@ void UEF::queue_implicit_byte(uint8_t byte)
void UEF::queue_bit(int bit)
{
// TODO: allow for 300-baud encoding
int number_of_cycles;
Time duration;
duration.clock_rate = _time_base * 4;
if(bit)
{
// Encode a 1 as four high-frequency waves
Time duration;
// encode high-frequency waves
duration.length = 1;
duration.clock_rate = _time_base * 4;
_queued_pulses.emplace_back(Pulse::Low, duration);
_queued_pulses.emplace_back(Pulse::High, duration);
_queued_pulses.emplace_back(Pulse::Low, duration);
_queued_pulses.emplace_back(Pulse::High, duration);
number_of_cycles = 2;
}
else
{
// Encode a 0 as two low-frequency waves
Time duration;
// encode low-frequency waves
duration.length = 2;
duration.clock_rate = _time_base * 4;
number_of_cycles = 1;
}
if(_is_300_baud) number_of_cycles *= 4;
while(number_of_cycles--)
{
_queued_pulses.emplace_back(Pulse::Low, duration);
_queued_pulses.emplace_back(Pulse::High, duration);
}

1
Storage/Tape/Formats/TapeUEF.hpp
View File

@ -43,6 +43,7 @@ class UEF : public Tape {
gzFile _file;
unsigned int _time_base;
bool _is_at_end;
bool _is_300_baud;
std::vector<Pulse> _queued_pulses;
size_t _pulse_pointer;