| /* |
| * Segmented Ring Buffer |
| * |
| * Copyright (C) 2015 Ettus Research LLC |
| * |
| * Author: Tom Tsou <tom@tsou.cc> |
| * |
| * SPDX-License-Identifier: AGPL-3.0+ |
| * |
| * 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; |
| } |