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CLK/Storage/Disk/PCMSegment.hpp

87 lines
1.8 KiB
C++

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