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fm_transmitter.cpp
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fm_transmitter.cpp
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#include "transmitter.hpp"
#include <iostream>
#include <csignal>
#include <unistd.h>
std::mutex mtx;
bool enable = true;
Transmitter *transmitter = nullptr;
void sigIntHandler(int sigNum)
{
if (transmitter) {
std::cout << "Stopping..." << std::endl;
transmitter->Stop();
enable = false;
}
}
int main(int argc, char** argv)
{
float frequency = 100.f, bandwidth = 200.f;
uint16_t dmaChannel = 0;
bool showUsage = true, loop = false;
int opt, filesOffset;
while ((opt = getopt(argc, argv, "rf:d:b:v")) != -1) {
switch (opt) {
case 'r':
loop = true;
break;
case 'f':
frequency = std::stof(optarg);
break;
case 'd':
dmaChannel = std::stoi(optarg);
break;
case 'b':
bandwidth = std::stof(optarg);
break;
case 'v':
std::cout << EXECUTABLE << " version: " << VERSION << std::endl;
return 0;
}
}
if (optind < argc) {
filesOffset = optind;
showUsage = false;
}
if (showUsage) {
std::cout << "Usage: " << EXECUTABLE << " [-f <frequency>] [-b <bandwidth>] [-d <dma_channel>] [-r] <file>" << std::endl;
return 0;
}
int result = EXIT_SUCCESS;
std::signal(SIGINT, sigIntHandler);
std::signal(SIGTERM, sigIntHandler);
try {
transmitter = new Transmitter();
std::cout << "Broadcasting at " << frequency << " MHz with " << bandwidth << " kHz bandwidth" << std::endl;
do {
std::string filename = argv[optind++];
if ((optind == argc) && loop) {
optind = filesOffset;
}
WaveReader reader(filename != "-" ? filename : std::string(), enable, mtx);
WaveHeader header = reader.GetHeader();
std::cout << "Playing: " << reader.GetFilename() << ", "
<< header.sampleRate << " Hz, "
<< header.bitsPerSample << " bits, "
<< ((header.channels > 0x01) ? "stereo" : "mono") << std::endl;
transmitter->Transmit(reader, frequency, bandwidth, dmaChannel, optind < argc);
} while (enable && (optind < argc));
} catch (std::exception &catched) {
std::cout << "Error: " << catched.what() << std::endl;
result = EXIT_FAILURE;
}
if (transmitter) {
auto temp = transmitter;
transmitter = nullptr;
delete temp;
}
return result;
}