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76 lines
2.2 KiB
C++
76 lines
2.2 KiB
C++
//
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// PCMPatchedTrack.hpp
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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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#ifndef PCMPatchedTrack_hpp
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#define PCMPatchedTrack_hpp
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#include "Disk.hpp"
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#include "PCMSegment.hpp"
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namespace Storage {
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namespace Disk {
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/*!
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A subclass of @c Track that patches an existing track with PCM segments.
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*/
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class PCMPatchedTrack: public Track {
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public:
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/*!
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Constructs a @c PCMPatchedTrack that will return events from @c underlying_track in
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regions where it has not had alternative PCM data installed.
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*/
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PCMPatchedTrack(std::shared_ptr<Track> underlying_track);
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/*!
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Copy constructor, for Track.
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*/
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PCMPatchedTrack(const PCMPatchedTrack &);
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/*!
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Replaces whatever is currently on the track from @c start_position to @c start_position + segment length
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with the contents of @c segment.
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@param start_time The time at which this segment begins. Must be in the range [0, 1).
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@param segment The PCM segment to add.
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@param clamp_to_index_hole If @c true then the new segment will be truncated if it overruns the index hole;
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it will otherwise write over the index hole and continue.
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*/
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void add_segment(const Time &start_time, const PCMSegment &segment, bool clamp_to_index_hole);
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// To satisfy Storage::Disk::Track
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Event get_next_event();
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Time seek_to(const Time &time_since_index_hole);
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Track *clone();
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private:
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std::shared_ptr<Track> underlying_track_;
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struct Period {
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Time start_time, end_time;
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Time segment_start_time;
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std::shared_ptr<PCMSegmentEventSource> event_source; // nullptr => use the underlying track
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void push_start_to_time(const Storage::Time &new_start_time);
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void trim_end_to_time(const Storage::Time &new_end_time);
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Period(const Time &start_time, const Time &end_time, const Time &segment_start_time, std::shared_ptr<PCMSegmentEventSource> event_source) :
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start_time(start_time), end_time(end_time), segment_start_time(segment_start_time), event_source(event_source) {}
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Period(const Period &);
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};
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std::vector<Period> periods_;
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std::vector<Period>::iterator active_period_;
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Time current_time_, insertion_error_;
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void insert_period(const Period &period);
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};
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}
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}
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#endif /* PCMPatchedTrack_hpp */
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