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// Copyright (c) 2016-2017 Josh Blum
// SPDX-License-Identifier: BSL-1.0
#include <SoapySDR/Device.hpp>
#include <SoapySDR/Formats.hpp>
#include <SoapySDR/Errors.hpp>
#include <string>
#include <cstdlib>
#include <iostream>
#include <stdexcept>
#include <csignal>
#include <chrono>
#include <cstdio>
static sig_atomic_t loopDone = false;
static void sigIntHandler(const int)
{
loopDone = true;
}
void runRateTestStreamLoop(
SoapySDR::Device *device,
SoapySDR::Stream *stream,
const int direction,
const size_t numChans,
const size_t elemSize)
{
//allocate buffers for the stream read/write
const size_t numElems = device->getStreamMTU(stream);
std::vector<std::vector<char>> buffMem(numChans, std::vector<char>(elemSize*numElems));
std::vector<void *> buffs(numChans);
for (size_t i = 0; i < numChans; i++) buffs[i] = buffMem[i].data();
//state collected in this loop
unsigned int overflows(0);
unsigned int underflows(0);
unsigned long long totalSamples(0);
const auto startTime = std::chrono::high_resolution_clock::now();
auto timeLastPrint = std::chrono::high_resolution_clock::now();
auto timeLastSpin = std::chrono::high_resolution_clock::now();
auto timeLastStatus = std::chrono::high_resolution_clock::now();
int spinIndex(0);
std::cout << "Starting stream loop, press Ctrl+C to exit..." << std::endl;
device->activateStream(stream);
signal(SIGINT, sigIntHandler);
while (not loopDone)
{
int ret(0);
int flags(0);
long long timeNs(0);
switch(direction)
{
case SOAPY_SDR_RX:
ret = device->readStream(stream, buffs.data(), numElems, flags, timeNs);
break;
case SOAPY_SDR_TX:
ret = device->writeStream(stream, buffs.data(), numElems, flags, timeNs);
break;
}
if (ret == SOAPY_SDR_TIMEOUT) continue;
if (ret == SOAPY_SDR_OVERFLOW)
{
overflows++;
continue;
}
if (ret == SOAPY_SDR_UNDERFLOW)
{
underflows++;
continue;
}
if (ret < 0)
{
std::cerr << "Unexpected stream error " << SoapySDR::errToStr(ret) << std::endl;
break;
}
totalSamples += ret;
const auto now = std::chrono::high_resolution_clock::now();
if (timeLastSpin + std::chrono::milliseconds(300) < now)
{
timeLastSpin = now;
static const char spin[] = {"|/-\\"};
printf("\b%c", spin[(spinIndex++)%4]);
fflush(stdout);
}
//occasionally read out the stream status (non blocking)
if (timeLastStatus + std::chrono::seconds(1) < now)
{
timeLastStatus = now;
while (true)
{
size_t chanMask; int flags; long long timeNs;
ret = device->readStreamStatus(stream, chanMask, flags, timeNs, 0);
if (ret == SOAPY_SDR_OVERFLOW) overflows++;
else if (ret == SOAPY_SDR_UNDERFLOW) underflows++;
else if (ret == SOAPY_SDR_TIME_ERROR) {}
else break;
}
}
if (timeLastPrint + std::chrono::seconds(5) < now)
{
timeLastPrint = now;
const auto timePassed = std::chrono::duration_cast<std::chrono::microseconds>(now - startTime);
const auto sampleRate = double(totalSamples)/timePassed.count();
printf("\b%g Msps\t%g MBps", sampleRate, sampleRate*numChans*elemSize);
if (overflows != 0) printf("\tOverflows %u", overflows);
if (underflows != 0) printf("\tUnderflows %u", underflows);
printf("\n ");
}
}
device->deactivateStream(stream);
}
int SoapySDRRateTest(
const std::string &argStr,
const double sampleRate,
const std::string &channelStr,
const std::string &directionStr)
{
SoapySDR::Device *device(nullptr);
try
{
device = SoapySDR::Device::make(argStr);
//parse the direction to the integer enum
int direction(-1);
if (directionStr == "RX" or directionStr == "rx") direction = SOAPY_SDR_RX;
if (directionStr == "TX" or directionStr == "tx") direction = SOAPY_SDR_TX;
if (direction == -1) throw std::invalid_argument("direction not in RX/TX: " + directionStr);
//build channels list, using KwargsFromString is a easy parsing hack
std::vector<size_t> channels;
for (const auto &pair : SoapySDR::KwargsFromString(channelStr))
{
channels.push_back(std::stoi(pair.first));
}
if (channels.empty()) channels.push_back(0);
//initialize the sample rate for all channels
for (const auto &chan : channels)
{
device->setSampleRate(direction, chan, sampleRate);
}
//create the stream, use the native format
double fullScale(0.0);
const auto format = device->getNativeStreamFormat(direction, channels.front(), fullScale);
const size_t elemSize = SoapySDR::formatToSize(format);
auto stream = device->setupStream(direction, format, channels);
//run the rate test one setup is complete
std::cout << "Stream format: " << format << std::endl;
std::cout << "Num channels: " << channels.size() << std::endl;
std::cout << "Element size: " << elemSize << " bytes" << std::endl;
std::cout << "Begin " << directionStr << " rate test at " << (sampleRate/1e6) << " Msps" << std::endl;
runRateTestStreamLoop(device, stream, direction, channels.size(), elemSize);
//cleanup stream and device
device->closeStream(stream);
SoapySDR::Device::unmake(device);
}
catch (const std::exception &ex)
{
std::cerr << "Error in rate test: " << ex.what() << std::endl;
SoapySDR::Device::unmake(device);
return EXIT_FAILURE;
}
return EXIT_FAILURE;
}
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