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Experimental [sample rate buffer <-> frame rate] balancing.

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This commit is contained in:
Charles J. Cliffe 2015-09-22 21:03:23 -04:00
parent 283e780732
commit fc068bff7a
2 changed files with 27 additions and 13 deletions
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39
src/sdr/SoapySDRThread.cpp
View File

@ -116,12 +116,12 @@ std::vector<SDRDeviceInfo *> *SDRThread::enumerate_devices() {
}
void SDRThread::run() {
#ifdef __APPLE__
pthread_t tID = pthread_self(); // ID of this thread
int priority = sched_get_priority_max( SCHED_FIFO) - 1;
sched_param prio = { priority }; // scheduling priority of thread
pthread_setschedparam(tID, SCHED_FIFO, &prio);
#endif
//#ifdef __APPLE__
// pthread_t tID = pthread_self(); // ID of this thread
// int priority = sched_get_priority_max( SCHED_FIFO) - 1;
// sched_param prio = { priority }; // scheduling priority of thread
// pthread_setschedparam(tID, SCHED_FIFO, &prio);
//#endif
std::cout << "SDR thread initializing.." << std::endl;
@ -140,7 +140,7 @@ void SDRThread::run() {
long long frequency = wxGetApp().getConfig()->getCenterFreq();
int ppm = devConfig->getPPM();
int direct_sampling_mode = devConfig->getDirectSampling();;
// int buf_size = BUF_SIZE;
int numElems = 0;
offset.store(devConfig->getOffset());
wxGetApp().setSwapIQ(devConfig->getIQSwap());
@ -148,7 +148,7 @@ void SDRThread::run() {
SDRDeviceInfo *dev = devs[deviceId];
SoapySDR::Kwargs args = dev->getDeviceArgs();
args["direct_samp"] = std::to_string(devConfig->getDirectSampling());
args["buffers"] = "8";
args["buffers"] = "6";
args["buflen"] = "16384";
SoapySDR::Device *device = SoapySDR::Device::make(args);
@ -160,9 +160,10 @@ void SDRThread::run() {
SoapySDR::Stream *stream = device->setupStream(SOAPY_SDR_RX,"CF32");
device->activateStream(stream);
numElems = getOptimalElementCount(sampleRate.load(), 60);
void *buffs[1];
buffs[0] = malloc(BUF_SIZE * sizeof(float));
buffs[0] = malloc(numElems * 2 * sizeof(float));
int flags;
long long timeNs;
@ -238,7 +239,7 @@ void SDRThread::run() {
SoapySDR::Kwargs args = dev->getDeviceArgs();
args["direct_samp"] = std::to_string(devConfig->getDirectSampling());
args["buffers"] = "8";
args["buffers"] = "6";
args["buflen"] = "16384";
device = SoapySDR::Device::make(args);
@ -262,6 +263,10 @@ void SDRThread::run() {
if (rate_changed) {
device->setSampleRate(SOAPY_SDR_RX,0,new_rate);
sampleRate.store(device->getSampleRate(SOAPY_SDR_RX,0));
numElems = getOptimalElementCount(sampleRate.load(), 60);
free(buffs[0]);
buffs[0] = malloc(numElems * 2 * sizeof(float));
}
if (freq_changed) {
frequency = new_freq;
@ -277,7 +282,7 @@ void SDRThread::run() {
}
int n_read = device->readStream(stream, buffs, BUF_SIZE/2, flags, timeNs);
int n_read = device->readStream(stream, buffs, numElems, flags, timeNs);
// std::cout << n_read << ", " << timeNs << std::endl;
@ -301,7 +306,8 @@ void SDRThread::run() {
device->deactivateStream(stream);
device->closeStream(stream);
SoapySDR::Device::unmake(device);
free(buffs[0]);
buffers.purge();
std::cout << "SDR thread done." << std::endl;
}
@ -314,3 +320,10 @@ int SDRThread::getDeviceId() const {
void SDRThread::setDeviceId(int deviceId) {
this->deviceId.store(deviceId);
}
int SDRThread::getOptimalElementCount(long long sampleRate, int fps) {
int elemCount = (int)floor((double)sampleRate/(double)fps);
elemCount = int(ceil((double)elemCount/512.0)*512.0);
std::cout << "calculated optimal element count of " << elemCount << std::endl;
return elemCount;
}

1
src/sdr/SoapySDRThread.h
View File

@ -62,6 +62,7 @@ public:
int getDeviceId() const;
void setDeviceId(int deviceId);
int getOptimalElementCount(long long sampleRate, int fps);
protected:
static std::vector<std::string> factories;