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Switch to liquid-dsp block functions in demod

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This commit is contained in:
Charles J. Cliffe 2014-12-14 20:23:52 -05:00
parent 24cd93d1ae
commit cd5f43d5c4
1 changed files with 26 additions and 27 deletions
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53
src/demod/DemodulatorThread.cpp
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@ -90,6 +90,9 @@ void DemodulatorThread::threadMain() {
initialize();
}
liquid_float_complex *in_buf = new liquid_float_complex[BUF_SIZE / 2];
liquid_float_complex *out_buf = new liquid_float_complex[BUF_SIZE / 2];
std::cout << "Demodulator thread started.." << std::endl;
while (!terminated) {
DemodulatorThreadIQData inp;
@ -151,45 +154,38 @@ void DemodulatorThread::threadMain() {
std::vector<signed char> *data = &inp.data;
if (data->size()) {
liquid_float_complex filtered_input[BUF_SIZE / 2];
liquid_float_complex x, y, z;
liquid_float_complex *temp_buf;
for (int i = 0; i < BUF_SIZE / 2; i++) {
if (shift_freq != 0) {
nco_crcf_step(nco_shift);
z.real = (float) (*data)[i * 2] / 127.0f;
z.imag = (float) (*data)[i * 2 + 1] / 127.0f;
if (shift_freq < 0) {
nco_crcf_mix_up(nco_shift, z, &x);
} else {
nco_crcf_mix_down(nco_shift, z, &x);
}
} else {
x.real = (float) (*data)[i * 2] / 127.0f;
x.imag = (float) (*data)[i * 2 + 1] / 127.0f;
}
firfilt_crcf_push(fir_filter, x); // push input sample
firfilt_crcf_execute(fir_filter, &y); // compute output
filtered_input[i] = y;
in_buf[i].real = (float) (*data)[i * 2] / 127.0f;
in_buf[i].imag = (float) (*data)[i * 2 + 1] / 127.0f;
}
if (shift_freq != 0) {
if (shift_freq < 0) {
nco_crcf_mix_block_up(nco_shift, in_buf, out_buf, BUF_SIZE / 2);
} else {
nco_crcf_mix_block_down(nco_shift, in_buf, out_buf, BUF_SIZE / 2);
}
temp_buf = in_buf;
in_buf = out_buf;
out_buf = temp_buf;
}
firfilt_crcf_execute_block(fir_filter, in_buf, BUF_SIZE / 2, out_buf);
int out_size = ceil((float) (BUF_SIZE / 2) * resample_ratio);
liquid_float_complex resampled_output[out_size];
float demod_output[out_size];
unsigned int num_written; // number of values written to buffer
msresamp_crcf_execute(resampler, filtered_input, (BUF_SIZE / 2), resampled_output, &num_written);
msresamp_crcf_execute(resampler, out_buf, (BUF_SIZE / 2), resampled_output, &num_written);
float pcm = 0;
freqdem_demodulate_block(fdem, resampled_output, num_written, demod_output);
for (int i = 0; i < num_written; i++) {
freqdem_demodulate(fdem, resampled_output[i], &pcm);
resampled_output[i].real = (float) pcm;
resampled_output[i].real = demod_output[i];
resampled_output[i].imag = 0;
}
@ -248,6 +244,9 @@ void DemodulatorThread::threadMain() {
}
}
delete in_buf;
delete out_buf;
std::cout << "Demodulator thread done." << std::endl;
DemodulatorThreadCommand tCmd(DemodulatorThreadCommand::DEMOD_THREAD_CMD_DEMOD_TERMINATED);
tCmd.context = this;