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Made an attempt to come up with a data structure that actually makes sense (though perhaps this is textbook list rather than vector stuff? I guess it depends on the frequency I expect inserts to occur versus reads) and to implement inserts. Though the Periods aren't yet honoured.

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This commit is contained in:
Thomas Harte
2016-12-19 07:42:43 -05:00
parent 1df478d250
commit 8f937ceac8
3 changed files with 82 additions and 14 deletions
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Storage/Disk/PCMPatchedTrack.cpp
+66 -7
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@@ -11,18 +11,77 @@
using namespace Storage::Disk;
PCMPatchedTrack::PCMPatchedTrack(std::shared_ptr<Track> underlying_track) :
underlying_track_(underlying_track),
active_patch_((size_t)-1)
{}
void PCMPatchedTrack::add_segment(const Time &start_position, const PCMSegment &segment)
underlying_track_(underlying_track)
{
patches_.emplace_back(start_position, segment);
Time zero(0);
Time one(1);
periods_.emplace_back(zero, one, zero, nullptr);
active_period_ = &periods_.back();
}
void PCMPatchedTrack::add_segment(const Time &start_time, const PCMSegment &segment)
{
event_sources_.emplace_back(segment);
Time zero(0);
Period insertion_period(start_time, start_time + event_sources_.back().get_length(), zero, &event_sources_.back());
// the new segment may wrap around, so divide it up into track-length parts if required
Time one = Time(1);
while(insertion_period.end_time > one)
{
Time next_end_time = insertion_period.end_time - one;
insertion_period.end_time = one;
insert_period(insertion_period);
insertion_period.start_time = zero;
insertion_period.end_time = next_end_time;
}
insert_period(insertion_period);
}
void PCMPatchedTrack::insert_period(const Period &period)
{
// find the existing period that the new period starts in
size_t start_index = 0;
while(periods_[start_index].start_time >= period.end_time) start_index++;
// find the existing period that the new period end in
size_t end_index = 0;
while(periods_[end_index].end_time < period.end_time) end_index++;
// perform a division if called for
if(start_index == end_index)
{
Period right_period = periods_[start_index];
Time adjustment = period.start_time - right_period.start_time;
right_period.end_time += adjustment;
right_period.segment_start_time += adjustment;
periods_[start_index].end_time = period.start_time;
periods_.insert(periods_.begin() + (int)start_index + 1, period);
periods_.insert(periods_.begin() + (int)start_index + 2, right_period);
}
else
{
// perform a left chop on the thing at the start and a right chop on the thing at the end
periods_[start_index].end_time = period.start_time;
Time adjustment = period.start_time - periods_[end_index].start_time;
periods_[end_index].end_time += adjustment;
periods_[end_index].segment_start_time += adjustment;
// remove anything in between
periods_.erase(periods_.begin() + (int)start_index + 1, periods_.begin() + (int)end_index - 1);
// insert the new period
periods_.insert(periods_.begin() + (int)start_index + 1, period);
}
}
Track::Event PCMPatchedTrack::get_next_event()
{
// if(active_patch_ == (size_t)-1)
return underlying_track_->get_next_event();
}