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/*
* Segmented Ring Buffer
*
* Copyright (C) 2015 Ettus Research LLC
*
* Author: Tom Tsou <tom@tsou.cc>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* See the COPYING file in the main directory for details.
*/
#include <string.h>
#include <iostream>
#include "radioBuffer.h"
RadioBuffer::RadioBuffer(size_t numSegments, size_t segmentLen,
size_t hLen, bool outDirection)
: writeIndex(0), readIndex(0), availSamples(0)
{
if (!outDirection)
hLen = 0;
buffer = new float[2 * (hLen + numSegments * segmentLen)];
bufferLen = numSegments * segmentLen;
segments.resize(numSegments);
for (size_t i = 0; i < numSegments; i++)
segments[i] = &buffer[2 * (hLen + i * segmentLen)];
this->outDirection = outDirection;
this->numSegments = numSegments;
this->segmentLen = segmentLen;
this->hLen = hLen;
}
RadioBuffer::~RadioBuffer()
{
delete[] buffer;
}
void RadioBuffer::reset()
{
writeIndex = 0;
readIndex = 0;
availSamples = 0;
}
/*
* Output direction
*
* Return a pointer to the oldest segment or NULL if a complete segment is not
* available.
*/
const float *RadioBuffer::getReadSegment()
{
if (!outDirection) {
std::cout << "Invalid direction" << std::endl;
return NULL;
}
if (availSamples < segmentLen) {
std::cout << "Not enough samples " << std::endl;
std::cout << availSamples << " available per segment "
<< segmentLen << std::endl;
return NULL;
}
size_t num = readIndex / segmentLen;
if (num >= numSegments) {
std::cout << "Invalid segment" << std::endl;
return NULL;
} else if (!num) {
memcpy(buffer,
&buffer[2 * bufferLen],
hLen * 2 * sizeof(float));
}
availSamples -= segmentLen;
readIndex = (readIndex + segmentLen) % bufferLen;
return segments[num];
}
/*
* Output direction
*
* Write a non-segment length of samples to the buffer.
*/
bool RadioBuffer::write(const float *wr, size_t len)
{
if (!outDirection) {
std::cout << "Invalid direction" << std::endl;
return false;
}
if (availSamples + len > bufferLen) {
std::cout << "Insufficient space" << std::endl;
std::cout << bufferLen - availSamples << " available per write "
<< len << std::endl;
return false;
}
if (writeIndex + len <= bufferLen) {
memcpy(&buffer[2 * (writeIndex + hLen)],
wr, len * 2 * sizeof(float));
} else {
size_t len0 = bufferLen - writeIndex;
size_t len1 = len - len0;
memcpy(&buffer[2 * (writeIndex + hLen)], wr, len0 * 2 * sizeof(float));
memcpy(&buffer[2 * hLen], &wr[2 * len0], len1 * 2 * sizeof(float));
}
availSamples += len;
writeIndex = (writeIndex + len) % bufferLen;
return true;
}
bool RadioBuffer::zero(size_t len)
{
if (!outDirection) {
std::cout << "Invalid direction" << std::endl;
return false;
}
if (availSamples + len > bufferLen) {
std::cout << "Insufficient space" << std::endl;
std::cout << bufferLen - availSamples << " available per zero "
<< len << std::endl;
return false;
}
if (writeIndex + len <= bufferLen) {
memset(&buffer[2 * (writeIndex + hLen)],
0, len * 2 * sizeof(float));
} else {
size_t len0 = bufferLen - writeIndex;
size_t len1 = len - len0;
memset(&buffer[2 * (writeIndex + hLen)], 0, len0 * 2 * sizeof(float));
memset(&buffer[2 * hLen], 0, len1 * 2 * sizeof(float));
}
availSamples += len;
writeIndex = (writeIndex + len) % bufferLen;
return true;
}
/*
* Input direction
*/
float *RadioBuffer::getWriteSegment()
{
if (outDirection) {
std::cout << "Invalid direction" << std::endl;
return NULL;
}
if (bufferLen - availSamples < segmentLen) {
std::cout << "Insufficient samples" << std::endl;
std::cout << bufferLen - availSamples
<< " available for segment " << segmentLen
<< std::endl;
return NULL;
}
if (writeIndex % segmentLen) {
std::cout << "Internal segment error" << std::endl;
return NULL;
}
size_t num = writeIndex / segmentLen;
if (num >= numSegments)
return NULL;
availSamples += segmentLen;
writeIndex = (writeIndex + segmentLen) % bufferLen;
return segments[num];
}
bool RadioBuffer::zeroWriteSegment()
{
float *segment = getWriteSegment();
if (!segment)
return false;
memset(segment, 0, segmentLen * 2 * sizeof(float));
return true;
}
bool RadioBuffer::read(float *rd, size_t len)
{
if (outDirection) {
std::cout << "Invalid direction" << std::endl;
return false;
}
if (availSamples < len) {
std::cout << "Insufficient samples" << std::endl;
std::cout << availSamples << " available for "
<< len << std::endl;
return false;
}
if (readIndex + len <= bufferLen) {
memcpy(rd, &buffer[2 * readIndex], len * 2 * sizeof(float));
} else {
size_t len0 = bufferLen - readIndex;
size_t len1 = len - len0;
memcpy(rd, &buffer[2 * readIndex], len0 * 2 * sizeof(float));
memcpy(&rd[2 * len0], buffer, len1 * 2 * sizeof(float));
}
availSamples -= len;
readIndex = (readIndex + len) % bufferLen;
return true;
}
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