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PCE: fix limit seek time parameters

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This commit is contained in:
David Shadoff
2025-06-24 02:36:24 -04:00
committed by GitHub
parent 3fddb9d19a
commit baa19ad26c
1 changed files with 54 additions and 46 deletions
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100
support/pcecd/seektime.cpp
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@@ -65,56 +65,64 @@ float get_cd_seek_ms(int start_sector, int target_sector)
float track_difference;
float milliseconds = 0;
// First, we identify which group the start and end are in
start_index = find_group(start_sector);
target_index = find_group(target_sector);
// 360000 = number of sectors in an 80-minute CD (which weren't available)
//
if ((start_sector <= 360000) && (start_sector >= 0) && (target_sector <= 360000) && (target_sector >= 0))
{
// Now we find the track difference
//
// Note: except for the first and last sector groups, all groups are 1606.48 tracks per group.
//
if (target_index == start_index)
{
track_difference = (float)(abs(target_sector - start_sector) / sector_list[target_index].sec_per_revolution);
}
else if (target_index > start_index)
{
track_difference = (sector_list[start_index].sec_end - start_sector) / sector_list[start_index].sec_per_revolution;
track_difference += (target_sector - sector_list[target_index].sec_start) / sector_list[target_index].sec_per_revolution;
track_difference += (1606.48 * (target_index - start_index - 1));
}
else // start_index > target_index
{
track_difference = (start_sector - sector_list[start_index].sec_start) / sector_list[start_index].sec_per_revolution;
track_difference += (sector_list[target_index].sec_end - target_sector) / sector_list[target_index].sec_per_revolution;
track_difference += (1606.48 * (start_index - target_index - 1));
}
// First, we identify which group the start and end are in
start_index = find_group(start_sector);
target_index = find_group(target_sector);
// Now, we use the algorithm to determine how long to wait
if (abs(target_sector - start_sector) <= 3)
{
milliseconds = (2 * 1000 / 60);
}
else if (abs(target_sector - start_sector) < 7)
{
milliseconds = (9 * 1000 / 60) + (float)(sector_list[target_index].rotation_ms * 0.75);
}
else if (track_difference <= 80)
{
milliseconds = (17 * 1000 / 60) + (float)(sector_list[target_index].rotation_ms * 0.75);
}
else if (track_difference <= 160)
{
milliseconds = (22 * 1000 / 60) + (float)(sector_list[target_index].rotation_ms * 0.75);
}
else if (track_difference <= 644)
{
milliseconds = (22 * 1000 / 60) + (float)(sector_list[target_index].rotation_ms * 0.75) + (float)((track_difference - 161) * 16.66 / 80);
// Now we find the track difference
//
// Note: except for the first and last sector groups, all groups are 1606.48 tracks per group.
//
if (target_index == start_index)
{
track_difference = (float)(abs(target_sector - start_sector) / sector_list[target_index].sec_per_revolution);
}
else if (target_index > start_index)
{
track_difference = (sector_list[start_index].sec_end - start_sector) / sector_list[start_index].sec_per_revolution;
track_difference += (target_sector - sector_list[target_index].sec_start) / sector_list[target_index].sec_per_revolution;
track_difference += (1606.48 * (target_index - start_index - 1));
}
else // start_index > target_index
{
track_difference = (start_sector - sector_list[start_index].sec_start) / sector_list[start_index].sec_per_revolution;
track_difference += (sector_list[target_index].sec_end - target_sector) / sector_list[target_index].sec_per_revolution;
track_difference += (1606.48 * (start_index - target_index - 1));
}
// Now, we use the algorithm to determine how long to wait
if (abs(target_sector - start_sector) <= 3)
{
milliseconds = (2 * 1000 / 60);
}
else if (abs(target_sector - start_sector) < 7)
{
milliseconds = (9 * 1000 / 60) + (float)(sector_list[target_index].rotation_ms * 0.75);
}
else if (track_difference <= 80)
{
milliseconds = (17 * 1000 / 60) + (float)(sector_list[target_index].rotation_ms * 0.75);
}
else if (track_difference <= 160)
{
milliseconds = (22 * 1000 / 60) + (float)(sector_list[target_index].rotation_ms * 0.75);
}
else if (track_difference <= 644)
{
milliseconds = (22 * 1000 / 60) + (float)(sector_list[target_index].rotation_ms * 0.75) + (float)((track_difference - 161) * 16.66 / 80);
}
else
{
milliseconds = (36 * 1000 / 60) + (float)(sector_list[target_index].rotation_ms * 0.5) + (float)((track_difference - 644) * 16.66 / 195);
}
}
else
{
milliseconds = (36 * 1000 / 60) + (float)(sector_list[target_index].rotation_ms * 0.5) + (float)((track_difference - 644) * 16.66 / 195);
}
milliseconds = 0;
printf("From sector %d to sector %d:\n", start_sector, target_sector);
printf("Time = %.2f milliseconds\n", milliseconds);