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Oversample capturing for low bandwidths (#1332)

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* draft_low_bit_rate_solution_Capture_App

* second_draft_dynamic_decim

* Add support for Oversample Rate to capture.

---------

Co-authored-by: Brumi-2021 <ea3hqj@gmail.com>
This commit is contained in:
Kyle Reed
2023-07-31 08:46:07 -07:00
committed by GitHub
parent a24b3ad3de
commit d24ff7b3bc
10 changed files with 132 additions and 43 deletions
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63
firmware/application/ui_record_view.cpp
View File

@@ -101,24 +101,27 @@ void RecordView::focus() {
button_record.focus();
}
void RecordView::set_sampling_rate(const size_t new_sampling_rate) {
/* We are changing "REC" icon background to yellow in BW rec Options >600kHz
void RecordView::set_sampling_rate(size_t new_sampling_rate, OversampleRate new_oversample_rate) {
/* We are changing "REC" icon background to yellow in BW rec Options >600kHz
where we are NOT recording full IQ .C16 files (recorded files are decimated ones).
Those decimated recorded files,has not the full IQ samples .
are ok as recorded spectrum indication, but they should not be used by Replay app.
Those decimated recorded files, has not the full IQ samples.
are ok as recorded spectrum indication, but they should not be used by Replay app.
We keep original black background in all the correct IQ .C16 files BW's Options */
if (new_sampling_rate > 4800000) { // > BW >600kHz (fs=8*BW), (750kHz ...2750kHz)
We keep original black background in all the correct IQ .C16 files BW's Options */
if (new_sampling_rate > 4'800'000) { // > BW >600kHz (fs=8*BW), (750kHz...2750kHz)
button_record.set_background(ui::Color::yellow());
} else {
button_record.set_background(ui::Color::black());
}
if (new_sampling_rate != sampling_rate) {
if (new_sampling_rate != sampling_rate ||
new_oversample_rate != oversample_rate) {
stop();
sampling_rate = new_sampling_rate;
oversample_rate = new_oversample_rate;
baseband::set_sample_rate(sampling_rate);
baseband::set_oversample_rate(oversample_rate);
button_record.hidden(sampling_rate == 0);
text_record_filename.hidden(sampling_rate == 0);
@@ -162,12 +165,13 @@ void RecordView::start() {
rtcGetTime(&RTCD1, &datetime);
// ISO 8601
std::string date_time = to_string_dec_uint(datetime.year(), 4, '0') +
to_string_dec_uint(datetime.month(), 2, '0') +
to_string_dec_uint(datetime.day(), 2, '0') + "T" +
to_string_dec_uint(datetime.hour()) +
to_string_dec_uint(datetime.minute()) +
to_string_dec_uint(datetime.second());
std::string date_time =
to_string_dec_uint(datetime.year(), 4, '0') +
to_string_dec_uint(datetime.month(), 2, '0') +
to_string_dec_uint(datetime.day(), 2, '0') + "T" +
to_string_dec_uint(datetime.hour()) +
to_string_dec_uint(datetime.minute()) +
to_string_dec_uint(datetime.second());
base_path = filename_stem_pattern.string() + "_" + date_time + "_" +
trim(to_string_freq(receiver_model.target_frequency())) + "Hz";
@@ -197,10 +201,9 @@ void RecordView::start() {
case FileType::RawS8:
case FileType::RawS16: {
const auto metadata_file_error =
write_metadata_file(get_metadata_path(base_path),
{receiver_model.target_frequency(), sampling_rate / 8});
// Not sure why sample_rate is div. 8, but stored value matches rate settings.
const auto metadata_file_error = write_metadata_file(
get_metadata_path(base_path),
{receiver_model.target_frequency(), sampling_rate / toUType(oversample_rate)});
if (metadata_file_error.is_valid()) {
handle_error(metadata_file_error.value());
return;
@@ -263,18 +266,24 @@ void RecordView::update_status_display() {
text_record_dropped.set(s);
}
/*if (pitch_rssi_enabled) {
button_pitch_rssi.invert_colors();
}*/
/*
if (pitch_rssi_enabled) {
button_pitch_rssi.invert_colors();
}
*/
if (sampling_rate) {
if (sampling_rate > 0) {
const auto space_info = std::filesystem::space(u"");
const uint32_t bytes_per_second =
// - Audio is 1 int16_t per sample or '2' bytes per sample.
// - C8 captures 2 (I,Q) int8_t per sample or '2' bytes per sample.
// - C16 captures 2 (I,Q) int16_t per sample or '4' bytes per sample.
// Dividing to get actual sample rate because of decimation in proc_capture.
file_type == FileType::WAV ? (sampling_rate * 2) : (sampling_rate * ((file_type == FileType::RawS8) ? 2 : 4) / 8);
// - Audio is 1 int16_t per sample or '2' bytes per sample.
// - C8 captures 2 (I,Q) int8_t per sample or '2' bytes per sample.
// - C16 captures 2 (I,Q) int16_t per sample or '4' bytes per sample.
const auto bytes_per_sample = file_type == FileType::RawS16 ? 4 : 2;
// WAV files are not oversampled, but C8 and C16 are. Divide by the
// oversample rate to get the effective sample rate.
const auto effective_sampling_rate = file_type == FileType::WAV
? sampling_rate
: sampling_rate / toUType(oversample_rate);
const uint32_t bytes_per_second = effective_sampling_rate * bytes_per_sample;
const uint32_t available_seconds = space_info.free / bytes_per_second;
const uint32_t seconds = available_seconds % 60;
const uint32_t available_minutes = available_seconds / 60;