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138 lines
3.9 KiB
C++
138 lines
3.9 KiB
C++
//
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// PCMPatchedTrack.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 15/12/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#include "PCMPatchedTrack.hpp"
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using namespace Storage::Disk;
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PCMPatchedTrack::PCMPatchedTrack(std::shared_ptr<Track> underlying_track) :
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underlying_track_(underlying_track)
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{
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Time zero(0);
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Time one(1);
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periods_.emplace_back(zero, one, zero, nullptr);
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active_period_ = &periods_.back();
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}
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void PCMPatchedTrack::add_segment(const Time &start_time, const PCMSegment &segment)
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{
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event_sources_.emplace_back(segment);
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Time zero(0);
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Time end_time = start_time + event_sources_.back().get_length();
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Period insertion_period(start_time, end_time, zero, &event_sources_.back());
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// the new segment may wrap around, so divide it up into track-length parts if required
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Time one = Time(1);
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while(insertion_period.end_time > one)
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{
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Time next_end_time = insertion_period.end_time - one;
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insertion_period.end_time = one;
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insert_period(insertion_period);
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insertion_period.start_time = zero;
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insertion_period.end_time = next_end_time;
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}
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insert_period(insertion_period);
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// the vector may have been resized, potentially invalidating active_period_ even if
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// the thing it pointed to is still the same thing. So work it out afresh.
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for(auto period : periods_)
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{
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if(period.start_time <= current_time_ && period.end_time > current_time_)
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{
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active_period_ = .
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break;
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}
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}
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}
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void PCMPatchedTrack::insert_period(const Period &period)
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{
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// find the existing period that the new period starts in
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size_t start_index = 0;
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while(periods_[start_index].start_time >= period.end_time) start_index++;
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// find the existing period that the new period end in
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size_t end_index = 0;
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while(periods_[end_index].end_time < period.end_time) end_index++;
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// perform a division if called for
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if(start_index == end_index)
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{
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Period right_period = periods_[start_index];
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Time adjustment = period.start_time - right_period.start_time;
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right_period.end_time += adjustment;
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right_period.segment_start_time += adjustment;
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periods_[start_index].end_time = period.start_time;
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periods_.insert(periods_.begin() + (int)start_index + 1, period);
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periods_.insert(periods_.begin() + (int)start_index + 2, right_period);
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}
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else
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{
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// perform a left chop on the thing at the start and a right chop on the thing at the end
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periods_[start_index].end_time = period.start_time;
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Time adjustment = period.start_time - periods_[end_index].start_time;
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periods_[end_index].end_time += adjustment;
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periods_[end_index].segment_start_time += adjustment;
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// remove anything in between
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periods_.erase(periods_.begin() + (int)start_index + 1, periods_.begin() + (int)end_index - 1);
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// insert the new period
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periods_.insert(periods_.begin() + (int)start_index + 1, period);
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}
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}
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Track::Event PCMPatchedTrack::get_next_event()
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{
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while(1)
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{
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Track::Event event;
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if(active_period_->event_source) event = active_period_->event_source->get_next_event();
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else event = underlying_track_->get_next_event();
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current_time_ += event.length;
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if(current_time_ >= active_period_->end_time)
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{
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current_time_ -= active_period_->end_time;
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active_period_++;
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// if(active_period_
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}
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}
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// return active_period_->event_source->seek_to(zero);
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return underlying_track_->get_next_event();
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}
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Storage::Time PCMPatchedTrack::seek_to(const Time &time_since_index_hole)
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{
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for(auto period : periods_)
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{
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if(period.start_time <= time_since_index_hole && period.end_time > time_since_index_hole)
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{
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active_period_ = .
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if(period.event_source)
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return period.event_source->seek_to(time_since_index_hole - period.start_time) + period.start_time;
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else
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return underlying_track_->seek_to(time_since_index_hole);
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}
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}
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// this should never be reached
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Time zero(0);
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active_period_ = &periods_[0];
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if(active_period_->event_source)
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return active_period_->event_source->seek_to(zero);
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else
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return underlying_track_->seek_to(zero);
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}
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