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/*
* Sample Buffer - Allows reading and writing of timed samples
*
* Copyright 2010,2011 Free Software Foundation, Inc.
* Copyright (C) 2015 Ettus Research LLC
* Copyright 2019 sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
*
* Author: Tom Tsou <tom.tsou@ettus.com>
*
* 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 "smpl_buf.h"
#include <inttypes.h>
smpl_buf::smpl_buf(size_t len)
: buf_len(len), time_start(0), time_end(0),
data_start(0), data_end(0)
{
data = new uint32_t[len];
}
smpl_buf::~smpl_buf()
{
delete[] data;
}
ssize_t smpl_buf::avail_smpls(TIMESTAMP timestamp) const
{
if (timestamp < time_start)
return ERROR_TIMESTAMP;
else if (timestamp >= time_end)
return 0;
else
return time_end - timestamp;
}
ssize_t smpl_buf::read(void *buf, size_t len, TIMESTAMP timestamp)
{
int type_sz = 2 * sizeof(short);
// Check for valid read
if (timestamp < time_start)
return ERROR_TIMESTAMP;
if (timestamp >= time_end)
return 0;
if (len >= buf_len)
return ERROR_READ;
// How many samples should be copied
size_t num_smpls = time_end - timestamp;
if (num_smpls > len)
num_smpls = len;
// Starting index
size_t read_start = (data_start + (timestamp - time_start)) % buf_len;
// Read it
if (read_start + num_smpls < buf_len) {
size_t numBytes = len * type_sz;
memcpy(buf, data + read_start, numBytes);
} else {
size_t first_cp = (buf_len - read_start) * type_sz;
size_t second_cp = len * type_sz - first_cp;
memcpy(buf, data + read_start, first_cp);
memcpy((char*) buf + first_cp, data, second_cp);
}
data_start = (read_start + len) % buf_len;
time_start = timestamp + len;
if (time_start > time_end)
return ERROR_READ;
else
return num_smpls;
}
ssize_t smpl_buf::write(void *buf, size_t len, TIMESTAMP timestamp)
{
int type_sz = 2 * sizeof(short);
// Check for valid write
if ((len == 0) || (len >= buf_len))
return ERROR_WRITE;
if ((timestamp + len) <= time_end)
return ERROR_TIMESTAMP;
if (timestamp < time_end) {
LOGC(DDEV, ERR) << "Overwriting old buffer data: timestamp="
<< timestamp << " time_end=" << time_end;
// Do not return error here, because it's a rounding error and is not fatal
}
if (timestamp > time_end && time_end != 0) {
LOGC(DDEV, ERR) << "Skipping buffer data: timestamp="
<< timestamp << " time_end=" << time_end;
// Do not return error here, because it's a rounding error and is not fatal
}
// Starting index
size_t write_start = (data_start + (timestamp - time_start)) % buf_len;
// Write it
if ((write_start + len) < buf_len) {
size_t numBytes = len * type_sz;
memcpy(data + write_start, buf, numBytes);
} else {
size_t first_cp = (buf_len - write_start) * type_sz;
size_t second_cp = len * type_sz - first_cp;
memcpy(data + write_start, buf, first_cp);
memcpy(data, (char*) buf + first_cp, second_cp);
}
data_end = (write_start + len) % buf_len;
time_end = timestamp + len;
if (!data_start)
data_start = write_start;
if (((write_start + len) > buf_len) && (data_end > data_start))
return ERROR_OVERFLOW;
else if (time_end <= time_start)
return ERROR_WRITE;
else
return len;
}
std::string smpl_buf::str_status(TIMESTAMP timestamp) const
{
std::ostringstream ost("Sample buffer: ");
ost << "timestamp = " << timestamp;
ost << ", length = " << buf_len;
ost << ", time_start = " << time_start;
ost << ", time_end = " << time_end;
ost << ", data_start = " << data_start;
ost << ", data_end = " << data_end;
return ost.str();
}
std::string smpl_buf::str_code(ssize_t code)
{
switch (code) {
case ERROR_TIMESTAMP:
return "Sample buffer: Requested timestamp is not valid";
case ERROR_READ:
return "Sample buffer: Read error";
case ERROR_WRITE:
return "Sample buffer: Write error";
case ERROR_OVERFLOW:
return "Sample buffer: Overrun";
default:
return "Sample buffer: Unknown error";
}
}
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