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Started sketching out greater support. Mostly TODOs right now, but pulse sequence and pure tone are implemented. I probably also need at least the CSW block to hit everything you might see in a ZX80 or ZX81 tape. Then I can worry about the rest when I have a way to test them.

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This commit is contained in:
Thomas Harte 2017-07-17 19:38:15 -04:00
parent 94e3dd0d4f
commit 0350925c1e
2 changed files with 62 additions and 4 deletions
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59
Storage/Tape/Formats/TZX.cpp
View File

@ -48,7 +48,11 @@ void TZX::get_next_pulses() {
}
switch(chunk_id) {
case 0x19: get_generalised_data_block(); break;
case 0x10: get_standard_speed_data_block(); break;
case 0x11: get_turbo_speed_data_block(); break;
case 0x12: get_pure_tone_data_block(); break;
case 0x13: get_pulse_sequence(); break;
case 0x19: get_generalised_data_block(); break;
case 0x30: {
// Text description. Ripe for ignoring.
@ -140,10 +144,57 @@ void TZX::get_generalised_segment(uint32_t output_symbols, uint8_t max_pulses_pe
// Output waves.
for(auto length : symbol.pulse_lengths) {
if(!length) break;
is_high_ ^= true;
emplace_back(is_high_ ? Tape::Pulse::High : Tape::Pulse::Low, Storage::Time((unsigned int)length, StandardTZXClock));
post_pulse(length);
}
}
}
}
void TZX::post_pulse(unsigned int length) {
is_high_ ^= true;
emplace_back(is_high_ ? Tape::Pulse::High : Tape::Pulse::Low, Storage::Time(length, StandardTZXClock));
}
void TZX::get_standard_speed_data_block() {
__unused uint16_t pause_after_block = fgetc16le();
uint16_t data_length = fgetc16le();
if(!data_length) return;
uint8_t first_byte = (uint8_t)fgetc(file_);
__unused int pilot_tone_pulses = (first_byte < 128) ? 8063 : 3223;
ungetc(first_byte, file_);
// TODO: output pilot_tone_pulses pulses
// TODO: output data_length bytes, in the Spectrum encoding
fseek(file_, data_length, SEEK_CUR);
// TODO: output a pause of length paused_after_block ms
}
void TZX::get_turbo_speed_data_block() {
__unused uint16_t length_of_pilot_pulse = fgetc16le();
__unused uint16_t length_of_sync_first_pulse = fgetc16le();
__unused uint16_t length_of_sync_second_pulse = fgetc16le();
__unused uint16_t length_of_zero_bit_pulse = fgetc16le();
__unused uint16_t length_of_one_bit_pulse = fgetc16le();
__unused uint16_t length_of_pilot_tone = fgetc16le();
__unused uint8_t number_of_bits_in_final_byte = (uint8_t)fgetc(file_);
__unused uint16_t pause_after_block = fgetc16le();
uint16_t data_length = fgetc16le();
// TODO output as described
fseek(file_, data_length, SEEK_CUR);
}
void TZX::get_pure_tone_data_block() {
__unused uint16_t length_of_pulse = fgetc16le();
__unused uint16_t nunber_of_pulses = fgetc16le();
while(nunber_of_pulses--) post_pulse(length_of_pulse);
}
void TZX::get_pulse_sequence() {
uint8_t number_of_pulses = (uint8_t)fgetc(file_);
while(number_of_pulses--) {
post_pulse(fgetc16le());
}
}

7
Storage/Tape/Formats/TZX.hpp
View File

@ -37,8 +37,15 @@ class TZX: public PulseQueuedTape, public Storage::FileHolder {
bool is_high_;
void get_standard_speed_data_block();
void get_turbo_speed_data_block();
void get_pure_tone_data_block();
void get_pulse_sequence();
void get_generalised_data_block();
void get_generalised_segment(uint32_t output_symbols, uint8_t max_pulses_per_symbol, uint8_t number_of_symbols, bool is_data);
void post_pulse(unsigned int length);
};
}