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Replay buffer size and samplerate adjustment

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This commit is contained in:
furrtek 2017-06-24 18:42:41 +01:00
parent 33a2df9d2a
commit 46515ebb05
6 changed files with 36 additions and 26 deletions
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38
firmware/baseband/proc_replay.cpp
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@ -27,26 +27,40 @@
#include "utility.hpp"
ReplayProcessor::ReplayProcessor() {
// TODO: Interpolation filter needed !
/*spectrum_interval_samples = baseband_fs / spectrum_rate_hz;
spectrum_samples = 0;
channel_spectrum.set_decimation_factor(1);*/
}
void ReplayProcessor::execute(const buffer_c8_t& buffer) {
/* 2.4576MHz, 2048 samples */
/* 4MHz, 2048 samples */
size_t pos = 0;
for (size_t c = 0; c < 4; c++) {
if( stream ) {
const size_t bytes_to_read = sizeof(*buffer.p) * buffer.count / 4;
const auto result = stream->read(iq_buffer.p, bytes_to_read);
}
// File data is in C16 format, we need C8
// File samplerate is 500kHz, we're at 4MHz
// iq_buffer can only be 512 samples (RAM limitation)
// For a full 2048-sample C8 buffer, we need:
// 2048 samples * 2 bytes per sample = 4096 bytes
// Since we're oversampling by 4M/500k = 8, we only need 2048/8 = 256 samples from the file
// So 256 * 4 bytes per sample (C16) = 1024 bytes from the file
if( stream ) {
const size_t bytes_to_read = sizeof(*buffer.p) * 2 * (buffer.count / 8); // *2 (C16), /8 (oversampling)
const auto result = stream->read(iq_buffer.p, bytes_to_read);
}
//feed_channel_stats(channel);
for (size_t i = 0; i < (buffer.count / 4); i++) {
buffer.p[pos] = { iq_buffer.p[i].real() >> 8, iq_buffer.p[i].imag() >> 8 };
pos++;
}
//feed_channel_stats(channel);
// Zero-stuff
for (size_t i = 0; i < buffer.count; i++) {
if (i & 3)
buffer.p[i] = { 0, 0 };
else
buffer.p[i] = { iq_buffer.p[i >> 3].real() >> 8, iq_buffer.p[i >> 3].imag() >> 8 };
}
/*spectrum_samples += channel.count;