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/**
* @file samplebuffer.hpp
* @brief Manages ADC/DAC buffer data.
*
* Copyright (C) 2023 Clyne Sullivan
*
* Distributed under the GNU GPL v3 or later. You should have received a copy of
* the GNU General Public License along with this program.
* If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef SAMPLEBUFFER_HPP_
#define SAMPLEBUFFER_HPP_
#include <array>
#include <cstdint>
using Sample = uint16_t;
constexpr unsigned int MAX_SAMPLE_BUFFER_BYTESIZE = sizeof(Sample) * 8192;
constexpr unsigned int MAX_SAMPLE_BUFFER_SIZE = MAX_SAMPLE_BUFFER_BYTESIZE / sizeof(Sample);
/**
* Manages a buffer of sample data from the ADC or DAC with facilities to
* work with separate halves of the total buffer (which is necessary when
* streaming data to or from the buffer).
*/
class SampleBuffer
{
public:
// Manage the sample data memory at 'buffer'.
SampleBuffer(Sample *buffer);
/**
* Fill the current buffer with midpoint (2048/0V) values.
*/
void clear();
/**
* Copy 'srcsize' samples from 'data' into the first half of the current
* buffer. Also do equivalent of setModified().
*/
void modify(Sample *data, unsigned int srcsize);
/**
* Copy 'srcsize' samples from 'data' into the second half of the current
* buffer. Also do equivalent of setMidmodified().
*/
void midmodify(Sample *data, unsigned int srcsize);
/**
* Set modified buffer pointer to first half of the current buffer.
*/
void setModified();
/**
* Set modified buffer pointer to second half of the current buffer.
*/
void setMidmodified();
/**
* Return pointer to most recently modified buffer portion.
* Clears this internal pointer when called.
*/
Sample *modified();
/**
* Returns pointer to first half of current buffer.
*/
Sample *data();
/**
* Returns pointer to second half of current buffer.
*/
Sample *middata();
/**
* Returns uint8_t-casted pointer to the current buffer.
*/
uint8_t *bytedata();
/**
* Sets the total working size of the current buffer. Current buffer must
* be able to accommodate.
*/
void setSize(unsigned int size);
/**
* Returns the current total working size (number of samples).
*/
unsigned int size() const;
/**
* Returns the current total working size (number of bytes).
*/
unsigned int bytesize() const;
private:
Sample *m_buffer = nullptr;
unsigned int m_size = MAX_SAMPLE_BUFFER_SIZE;
Sample *m_modified = nullptr;
};
#endif // SAMPLEBUFFER_HPP_
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