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96 lines
2.9 KiB
C++
96 lines
2.9 KiB
C++
//
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// PCMTrack.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 10/07/2016.
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// Copyright 2016 Thomas Harte. All rights reserved.
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//
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#ifndef PCMTrack_hpp
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#define PCMTrack_hpp
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#include "Track.hpp"
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#include "PCMSegment.hpp"
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#include "../../../ClockReceiver/ClockReceiver.hpp"
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#include <vector>
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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 provides its @c Events by querying a pulse-code modulated record of original
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flux detections, with an implied index hole at the very start of the data.
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The data may consist of a single @c PCMSegment or of multiple, allowing a PCM-format track to contain
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multiple distinct segments of data, each with a separate clock rate.
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*/
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class PCMTrack: public Track {
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public:
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/*!
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Creates a @c PCMTrack consisting of multiple segments of data, permitting multiple clock rates.
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*/
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PCMTrack(const std::vector<PCMSegment> &);
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/*!
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Creates a @c PCMTrack consisting of a single continuous run of data, implying a constant clock rate.
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The segment's @c length_of_a_bit will be ignored and therefore need not be filled in.
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*/
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PCMTrack(const PCMSegment &);
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/*!
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Copy constructor; required for Tracks in order to support modifiable disks.
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*/
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PCMTrack(const PCMTrack &);
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/*!
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Creates a PCMTrack by sampling the original at a rate of @c bits_per_track.
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*/
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static PCMTrack *resampled_clone(Track *original, size_t bits_per_track);
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// as per @c Track
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Event get_next_event() override;
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Time seek_to(const Time &time_since_index_hole) override;
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Track *clone() const override;
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// Obtains a copy of this track, flattened to a single PCMSegment, which
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// consists of @c bits_per_track potential flux transition points.
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PCMTrack *resampled_clone(size_t bits_per_track);
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bool is_resampled_clone();
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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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This is a well-defined operation only for tracks with a single segment. The new segment will be resampled
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to the track's underlying segment, which will be mutated.
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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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private:
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/*!
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Creates a PCMTrack with a single segment, consisting of @c bits_per_track flux windows,
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initialised with no flux events.
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*/
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PCMTrack(unsigned int bits_per_track);
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// storage for the segments that describe this track
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std::vector<PCMSegmentEventSource> segment_event_sources_;
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// a pointer to the first bit to consider as the next event
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std::size_t segment_pointer_;
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PCMTrack();
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bool is_resampled_clone_ = false;
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};
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}
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}
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#endif /* PCMTrack_hpp */
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