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Attempted to implemnt seek_to and to finish add_segment. Started doing a little of get_next_event but ran out of time for the day.

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This commit is contained in:
Thomas Harte 2016-12-19 21:46:02 -05:00
parent 8f937ceac8
commit 1ef1f6ec69
2 changed files with 49 additions and 2 deletions
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48
Storage/Disk/PCMPatchedTrack.cpp
View File

@ -24,7 +24,8 @@ void PCMPatchedTrack::add_segment(const Time &start_time, const PCMSegment &segm
event_sources_.emplace_back(segment);
Time zero(0);
Period insertion_period(start_time, start_time + event_sources_.back().get_length(), zero, &event_sources_.back());
Time end_time = start_time + event_sources_.back().get_length();
Period insertion_period(start_time, end_time, zero, &event_sources_.back());
// the new segment may wrap around, so divide it up into track-length parts if required
Time one = Time(1);
@ -38,6 +39,17 @@ void PCMPatchedTrack::add_segment(const Time &start_time, const PCMSegment &segm
insertion_period.end_time = next_end_time;
}
insert_period(insertion_period);
// the vector may have been resized, potentially invalidating active_period_ even if
// the thing it pointed to is still the same thing. So work it out afresh.
for(auto period : periods_)
{
if(period.start_time <= current_time_ && period.end_time > current_time_)
{
active_period_ = &period;
break;
}
}
}
void PCMPatchedTrack::insert_period(const Period &period)
@ -82,10 +94,44 @@ void PCMPatchedTrack::insert_period(const Period &period)
Track::Event PCMPatchedTrack::get_next_event()
{
while(1)
{
Track::Event event;
if(active_period_->event_source) event = active_period_->event_source->get_next_event();
else event = underlying_track_->get_next_event();
current_time_ += event.length;
if(current_time_ >= active_period_->end_time)
{
current_time_ -= active_period_->end_time;
active_period_++;
// if(active_period_
}
}
// return active_period_->event_source->seek_to(zero);
return underlying_track_->get_next_event();
}
Storage::Time PCMPatchedTrack::seek_to(const Time &time_since_index_hole)
{
for(auto period : periods_)
{
if(period.start_time <= time_since_index_hole && period.end_time > time_since_index_hole)
{
active_period_ = &period;
if(period.event_source)
return period.event_source->seek_to(time_since_index_hole - period.start_time) + period.start_time;
else
return underlying_track_->seek_to(time_since_index_hole);
}
}
// this should never be reached
Time zero(0);
active_period_ = &periods_[0];
if(active_period_->event_source)
return active_period_->event_source->seek_to(zero);
else
return underlying_track_->seek_to(zero);
}

1
Storage/Disk/PCMPatchedTrack.hpp
View File

@ -50,6 +50,7 @@ class PCMPatchedTrack: public Track {
};
std::vector<Period> periods_;
Period *active_period_;
Time current_time_;
void insert_period(const Period &period);
};