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woz/flux: better implementation

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This commit is contained in:
Olivier Galibert 2022-08-11 11:12:48 +02:00
parent 5b034e4921
commit 709bb88139
1 changed files with 11 additions and 7 deletions
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18
src/lib/formats/ap2_dsk.cpp
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@ -1743,20 +1743,24 @@ bool a2_woz_format::load(util::random_read &io, uint32_t form_factor, const std:
uint32_t boff = (uint32_t)r16(img, trks_off + 0) * 512;
uint32_t track_size = r32(img, trks_off + 4);
uint32_t total_ticks = 0;
for(uint32_t i=0; i != track_size; i++)
total_ticks += img[boff+i];
// Ticks are 125ns, e.g. 8000000 ticks per second
static const int ticks_per_speed_zone[5] = {
60 * 8000000 / 394,
60 * 8000000 / 429,
60 * 8000000 / 472,
60 * 8000000 / 525,
60 * 8000000 / 590
};
// Assumptions: track starts at index, there's no flux
// change at index, there's no flux change at the end
uint32_t total_ticks = is_35 ? ticks_per_speed_zone[trkid / (2*16)] : 60 * 8000000 / 300;
std::vector<uint32_t> &buf = image->get_buffer(track, head, subtrack);
uint32_t cpos = 0;
for(uint32_t i=0; i != track_size; i++) {
uint8_t step = img[boff+i];
cpos += step;
if(step != 0xff && i != track_size-1)
buf.push_back(uint64_t(cpos)*200000000/total_ticks);
if(step != 0xff)
buf.push_back(floppy_image::MG_F | uint64_t(cpos)*200000000/total_ticks);
}
} else if(idx != 0xff) {