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99 lines
2.1 KiB
C++
99 lines
2.1 KiB
C++
//
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// PCMSegment.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 17/12/2016.
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// Copyright 2016 Thomas Harte. All rights reserved.
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//
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#ifndef PCMSegment_hpp
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#define PCMSegment_hpp
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#include <cstdint>
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#include <memory>
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#include <vector>
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#include "../../Storage.hpp"
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#include "Track.hpp"
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namespace Storage {
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namespace Disk {
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/*!
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A segment of PCM-sampled data.
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Bits from each byte are taken MSB to LSB.
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*/
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struct PCMSegment {
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Time length_of_a_bit = Time(1);
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unsigned int number_of_bits = 0;
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std::vector<uint8_t> data;
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PCMSegment(Time length_of_a_bit, unsigned int number_of_bits, std::vector<uint8_t> data)
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: length_of_a_bit(length_of_a_bit), number_of_bits(number_of_bits), data(data) {}
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PCMSegment() {}
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int bit(std::size_t index) const {
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return (data[index >> 3] >> (7 ^ (index & 7)))&1;
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}
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void clear() {
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number_of_bits = 0;
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data.clear();
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}
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PCMSegment &operator +=(const PCMSegment &rhs);
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};
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/*!
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Provides a stream of events by inspecting a PCMSegment.
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*/
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class PCMSegmentEventSource {
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public:
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/*!
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Constructs a @c PCMSegmentEventSource that will derive events from @c segment.
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The event source is initially @c reset.
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*/
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PCMSegmentEventSource(const PCMSegment &);
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/*!
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Copy constructor; produces a segment event source with the same underlying segment
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but a unique pointer into it.
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*/
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PCMSegmentEventSource(const PCMSegmentEventSource &);
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/*!
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@returns the next event that will occur in this event stream.
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*/
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Track::Event get_next_event();
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/*!
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Resets the event source to the beginning of its event stream, exactly as if
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it has just been constructed.
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*/
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void reset();
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/*!
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Seeks as close to @c time_from_start as the event source can manage while not
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exceeding it.
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@returns the time the source is now at.
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*/
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Time seek_to(const Time &time_from_start);
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/*!
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@returns the total length of the stream of data that the source will provide.
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*/
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Time get_length();
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private:
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std::shared_ptr<PCMSegment> segment_;
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std::size_t bit_pointer_;
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Track::Event next_event_;
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};
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}
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}
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#endif /* PCMSegment_hpp */
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