mirror of
https://github.com/TomHarte/CLK.git
synced 2024-07-27 17:29:38 +00:00
49 lines
1.1 KiB
C++
49 lines
1.1 KiB
C++
|
//
|
||
|
// PCMSegment.cpp
|
||
|
// Clock Signal
|
||
|
//
|
||
|
// Created by Thomas Harte on 17/12/2016.
|
||
|
// Copyright © 2016 Thomas Harte. All rights reserved.
|
||
|
//
|
||
|
|
||
|
#include "PCMSegment.hpp"
|
||
|
|
||
|
using namespace Storage::Disk;
|
||
|
|
||
|
PCMSegmentEventSource::PCMSegmentEventSource(const PCMSegment &segment) :
|
||
|
segment_(segment)
|
||
|
{
|
||
|
if(segment_.length_of_a_bit.length&1)
|
||
|
{
|
||
|
segment_.length_of_a_bit.length <<= 1;
|
||
|
segment_.length_of_a_bit.clock_rate <<= 1;
|
||
|
}
|
||
|
next_event_.length.clock_rate = segment_.length_of_a_bit.clock_rate;
|
||
|
reset();
|
||
|
}
|
||
|
|
||
|
void PCMSegmentEventSource::reset()
|
||
|
{
|
||
|
bit_pointer_ = 0;
|
||
|
next_event_.length.length = -(segment_.length_of_a_bit.length >> 1);
|
||
|
next_event_.type = Track::Event::FluxTransition;
|
||
|
}
|
||
|
|
||
|
Storage::Disk::Track::Event PCMSegmentEventSource::get_next_event()
|
||
|
{
|
||
|
Storage::Disk::Track::Event next_event;
|
||
|
|
||
|
const uint8_t *segment_data = segment_.data.data();
|
||
|
while(bit_pointer_ < segment_.number_of_bits)
|
||
|
{
|
||
|
int bit = segment_data[bit_pointer_ >> 3] & (0x80 >> (bit_pointer_&7));
|
||
|
bit_pointer_++;
|
||
|
next_event_.length.length += segment_.length_of_a_bit.length;
|
||
|
|
||
|
if(bit) return next_event_;
|
||
|
}
|
||
|
|
||
|
next_event_.type = Track::Event::IndexHole;
|
||
|
return next_event;
|
||
|
}
|