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Streaming.cpp
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Streaming.cpp
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#include "SoapyMiri.hpp"
#include <SoapySDR/Logger.hpp>
#include <SoapySDR/Formats.hpp>
#include <cstring>
std::vector<std::string> SoapyMiri::getStreamFormats(const int direction, const size_t channel) const {
return {
SOAPY_SDR_CS16,
SOAPY_SDR_CF32,
};
}
std::string SoapyMiri::getNativeStreamFormat(const int direction, const size_t channel, double &fullScale) const {
fullScale = 1 << 16;
return SOAPY_SDR_CS16;
}
SoapySDR::ArgInfoList SoapyMiri::getStreamArgsInfo(const int direction, const size_t channel) const {
SoapySDR::ArgInfoList streamArgs;
SoapySDR::ArgInfo bufflenArg;
bufflenArg.key = "bufflen";
bufflenArg.value = std::to_string(DEFAULT_BUFFER_LENGTH);
bufflenArg.name = "Buffer Size";
bufflenArg.description = "Number of bytes per buffer, multiples of 512 only.";
bufflenArg.units = "bytes";
bufflenArg.type = SoapySDR::ArgInfo::INT;
streamArgs.push_back(bufflenArg);
SoapySDR::ArgInfo buffersArg;
buffersArg.key = "buffers";
buffersArg.value = std::to_string(DEFAULT_NUM_BUFFERS);
buffersArg.name = "Ring buffers";
buffersArg.description = "Number of buffers in the ring.";
buffersArg.units = "buffers";
buffersArg.type = SoapySDR::ArgInfo::INT;
streamArgs.push_back(buffersArg);
SoapySDR::ArgInfo asyncbuffsArg;
asyncbuffsArg.key = "asyncBuffs";
asyncbuffsArg.value = "0";
asyncbuffsArg.name = "Async buffers";
asyncbuffsArg.description = "Number of async usb buffers (advanced).";
asyncbuffsArg.units = "buffers";
asyncbuffsArg.type = SoapySDR::ArgInfo::INT;
streamArgs.push_back(asyncbuffsArg);
return streamArgs;
}
/*******************************************************************
* Async thread work
******************************************************************/
static void _rx_callback(unsigned char *buf, uint32_t len, void *ctx) {
auto *self = (SoapyMiri *) ctx;
self->rx_callback(buf, len);
}
void SoapyMiri::rx_async_operation(void) {
mirisdr_read_async(dev, &_rx_callback, this, optNumBuffers, optBufferLength);
}
void SoapyMiri::rx_callback(unsigned char *buf, uint32_t len) {
// overflow condition: the caller is not reading fast enough
if (_buf_count == optNumBuffers) {
_overflowEvent = true;
return;
}
// copy into the buffer queue
auto &buff = buffs[_buf_tail];
// buff.tick = tick;
buff.data.resize(len);
std::memcpy(buff.data.data(), buf, len);
// increment the tail pointer
_buf_tail = (_buf_tail + 1) % optNumBuffers;
// increment buffers available under lock to avoid race in acquireReadBuffer wait
{
std::lock_guard<std::mutex> lock(_buf_mutex);
_buf_count++;
}
// notify readStream()
_buf_cond.notify_one();
}
/*******************************************************************
* Stream API
******************************************************************/
SoapySDR::Stream *SoapyMiri::setupStream(
const int direction,
const std::string &format,
const std::vector<size_t> &channels,
const SoapySDR::Kwargs &args
) {
if (!dev) {
throw std::runtime_error("Trying to setupStream without an initialized MiriSDR!");
}
if (direction != SOAPY_SDR_RX) {
throw std::runtime_error("LibMiriSDR supports only RX.");
}
if (channels.size() > 1 || (channels.size() > 0 && channels.at(0) != 0)) {
throw std::runtime_error("setupStream invalid channel selection");
}
if (format == SOAPY_SDR_CS16) {
sampleFormat = MIRI_FORMAT_CS16;
SoapySDR_logf(SOAPY_SDR_WARNING, "SoapyMiri: CS16 format is untested!");
} else if (format == SOAPY_SDR_CF32) {
sampleFormat = MIRI_FORMAT_CF32;
} else {
throw std::runtime_error("setupStream: invalid format '" + format + "', only CS16 and CF32 is supported by SoapyMiri.");
}
optBufferLength = DEFAULT_BUFFER_LENGTH;
if (args.count("bufflen") != 0) {
try {
int bufferLength_in = std::stoi(args.at("bufflen"));
if (bufferLength_in > 0) {
optBufferLength = bufferLength_in;
}
}
catch (const std::invalid_argument &) {}
}
SoapySDR_logf(SOAPY_SDR_DEBUG, "SoapyMiri Using buffer length %d", optBufferLength);
optNumBuffers = DEFAULT_NUM_BUFFERS;
if (args.count("buffers") != 0) {
try {
int numBuffers_in = std::stoi(args.at("buffers"));
if (numBuffers_in > 0) {
optNumBuffers = numBuffers_in;
}
}
catch (const std::invalid_argument &) {}
}
SoapySDR_logf(SOAPY_SDR_DEBUG, "SoapyMiri Using %d buffers", optNumBuffers);
// clear async fifo counts
_buf_tail = 0;
_buf_count = 0;
_buf_head = 0;
// allocate buffers
buffs.resize(optNumBuffers);
for (auto &buff : buffs) {
buff.data.reserve(optBufferLength);
buff.data.resize(optBufferLength);
}
return (SoapySDR::Stream *) this;
}
void SoapyMiri::closeStream(SoapySDR::Stream *stream) {
this->deactivateStream(stream, 0, 0);
buffs.clear();
}
size_t SoapyMiri::getStreamMTU(SoapySDR::Stream *stream) const {
return optBufferLength / BYTES_PER_SAMPLE;
}
int SoapyMiri::activateStream(
SoapySDR::Stream *stream,
const int flags,
const long long timeNs,
const size_t numElems
) {
if (!dev)
return 0;
resetBuffer = true;
remainingElems = 0;
if (!_rx_async_thread.joinable()) {
mirisdr_reset_buffer(dev);
_rx_async_thread = std::thread(&SoapyMiri::rx_async_operation, this);
}
return 0;
}
int SoapyMiri::deactivateStream(SoapySDR::Stream *stream, const int flags, const long long timeNs) {
if (!dev)
return 0;
if (_rx_async_thread.joinable()) {
mirisdr_cancel_async(dev);
_rx_async_thread.join();
}
return 0;
}
int SoapyMiri::readStream(
SoapySDR::Stream *stream,
void *const *buffs,
const size_t numElems,
int &flags,
long long &timeNs,
const long timeoutUs
) {
// drop remainder buffer on reset
if (resetBuffer && remainingElems != 0) {
remainingElems = 0;
this->releaseReadBuffer(stream, _currentHandle);
}
// this is the user's buffer for channel 0
void *buff0 = buffs[0];
// are elements left in the buffer? if not, do a new read.
if (remainingElems == 0) {
int ret = this->acquireReadBuffer(stream, _currentHandle, (const void **) &_currentBuff, flags, timeNs, timeoutUs);
if (ret < 0) {
return ret;
}
remainingElems = ret;
}
size_t returnedElems = std::min(remainingElems, numElems);
// convert into user's buff0
if (sampleFormat == MIRI_FORMAT_CS16) {
std::memcpy(buff0, _currentBuff, sizeof(int16_t) * 2 * returnedElems);
} else if (sampleFormat == MIRI_FORMAT_CF32) {
float *ftarget = (float *) buff0;
for (size_t i = 0; i < returnedElems; i++) {
ftarget[i * 2 + 0] = ((float) _currentBuff[i * 2 + 0]) * (1.0f / 32768.0f);
ftarget[i * 2 + 1] = ((float) _currentBuff[i * 2 + 1]) * (1.0f / 32768.0f);
}
}
// bump variables for next call into readStream
remainingElems -= returnedElems;
// BYTES_PER_SAMPLE is handled by _currentBuff being int16_t*, only account for I/Q.
_currentBuff += returnedElems * 2;
if (remainingElems != 0) {
flags |= SOAPY_SDR_MORE_FRAGMENTS;
} else {
this->releaseReadBuffer(stream, _currentHandle);
}
// return number of elements written to buff0
return returnedElems;
}
/*******************************************************************
* Direct buffer access API
******************************************************************/
size_t SoapyMiri::getNumDirectAccessBuffers(SoapySDR::Stream *stream) {
return buffs.size();
}
int SoapyMiri::getDirectAccessBufferAddrs(SoapySDR::Stream *stream, const size_t handle, void **outBuffs) {
outBuffs[0] = (void *) buffs[handle].data.data();
return 0;
}
int SoapyMiri::acquireReadBuffer(
SoapySDR::Stream *stream,
size_t &handle,
const void **outBuffs,
int &flags,
long long &timeNs,
const long timeoutUs
) {
// reset is issued by various settings to drain old data out of the queue
if (resetBuffer) {
// drain all buffers from the fifo
_buf_head = (_buf_head + _buf_count.exchange(0)) % optNumBuffers;
resetBuffer = false;
_overflowEvent = false;
}
// handle overflow from the rx callback thread
if (_overflowEvent) {
// drain the old buffers from the fifo
_buf_head = (_buf_head + _buf_count.exchange(0)) % optNumBuffers;
_overflowEvent = false;
SoapySDR::log(SOAPY_SDR_SSI, "O");
return SOAPY_SDR_OVERFLOW;
}
// wait for a buffer to become available
if (_buf_count == 0) {
std::unique_lock<std::mutex> lock(_buf_mutex);
_buf_cond.wait_for(lock, std::chrono::microseconds(timeoutUs), [this] { return _buf_count != 0; });
if (_buf_count == 0) {
return SOAPY_SDR_TIMEOUT;
}
}
// extract handle and buffer
handle = _buf_head;
_buf_head = (_buf_head + 1) % optNumBuffers;
outBuffs[0] = (void *) buffs[handle].data.data();
// return number available
return buffs[handle].data.size() / BYTES_PER_SAMPLE / 2; // 2 = I/Q, BYTES_PER_SAMPLE = 2 for uint16_t
// (since we only return 12-bit values wrapped in shorts)
}
void SoapyMiri::releaseReadBuffer(SoapySDR::Stream *stream, const size_t handle) {
//TODO this wont handle out of order releases
_buf_count--;
}