tnc3-firmware/TNC/DelayLine.hpp

80 wiersze
1.5 KiB
C++
Czysty Zwykły widok Historia

#ifndef MOBILINKD_DELAY_LINE_H_
#define MOBILINKD_DELAY_LINE_H_
#include <vector>
#include <cstdlib>
#include <cstdint>
#include <cassert>
#include <cstring>
namespace mobilinkd { namespace libafsk {
struct DelayLine {
size_t length_;
std::vector<uint8_t> buffer_;
size_t pos_;
DelayLine(double sample_rate, double delay)
: length_((delay / (1.0 / sample_rate)) + .5), buffer_(length_), pos_(0)
{}
bool operator()(bool value) {
bool r = buffer_[pos_];
buffer_[pos_++] = value;
if (pos_ == length_) pos_ = 0;
return r;
}
};
template <size_t N>
struct FixedDelayLine {
size_t length_;
char buffer_[N];
size_t pos_;
FixedDelayLine(double sample_rate, double delay)
: length_((delay / (1.0 / sample_rate)) + .5), buffer_(), pos_(0)
{
assert(length_ <= N);
memset(buffer_, 0, N);
}
bool operator()(bool value) {
bool r = buffer_[pos_];
buffer_[pos_++] = value;
if (pos_ == length_) pos_ = 0;
return r;
}
};
#if 0
template <size_t BLOCK_SIZE, size_t DELAY_BITS>
struct BlockDelayLine {
uint8_t buffer_[(BLOCK_SIZE + DELAY_BITS + 7) / 8];
size_t pos_;
BlockDelayLine(double sample_rate, double delay)
: length_((delay / (1.0 / sample_rate)) + .5), buffer_(), pos_(0)
{
assert(length_ <= N);
memset(buffer_, 0, N);
}
bool operator()(bool value) {
bool r = buffer_[pos_];
buffer_[pos_++] = value;
if (pos_ == length_) pos_ = 0;
return r;
}
};
#endif
}} // mobilinkd::libafsk
#endif // MOBILINKD_DELAY_LINE_H_