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add input monitor

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This commit is contained in:
Sébastien Bourdeauducq 2025-01-02 15:31:56 +08:00
parent e68cf07694
commit 875650345b
2 changed files with 112 additions and 14 deletions
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6
dsp_lib.h
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@ -19,6 +19,9 @@ class DDS {
phase += ftw; // wraps on overflow
return sin(phase*2.0*M_PI/(double)PHASE_MAX);
}
phase_t get_phase() {
return phase;
}
};
template<typename T, unsigned int order>
@ -60,4 +63,7 @@ class Lockin {
phase -= ftw; // wraps on underflow
return lpf.update(rotated);
}
phase_t get_phase() {
return phase;
}
};

118
sndlock.cpp
View File

@ -23,17 +23,26 @@
#define SND_BUFLEN 4096
static std::atomic<bool> shutdown_threads;
static std::atomic<double> frequency[SND_PCHAN];
static std::atomic<double> amplitude[SND_PCHAN];
#define HIST_DEPTH 512
static std::atomic<double> peak;
static std::atomic<bool> clipped;
static std::atomic<int> in_wave_trigger;
static std::mutex in_wave_mutex;
static float in_wave[HIST_DEPTH];
static std::atomic<double> lpf_bandwidth[SND_PCHAN];
static std::mutex li_hist_mutex;
static std::atomic<bool> li_hist_pause[SND_PCHAN];
static float li_hist_mag[SND_PCHAN][HIST_DEPTH];
static float li_hist_phase[SND_PCHAN][HIST_DEPTH];
enum class InWaveState { delay, wait_trigger, capturing };
static void dsp_thread()
{
struct sio_hdl *hdl;
@ -78,6 +87,14 @@ static void dsp_thread()
FIFO<phase_t, 8> ftw_fifo[SND_PCHAN];
int clipped_count = 0;
double peak_running = 0.0;
int peak_count = 0;
phase_t last_trig_phase = 0;
InWaveState in_wave_state = InWaveState::delay;
int in_wave_count = 0;
float in_wave_buf[HIST_DEPTH];
Lockin<4> lockin[SND_PCHAN];
for(int i=0;i<SND_PCHAN;i++)
// input channels are averaged together to reduce uncorrelated noise
@ -126,22 +143,72 @@ static void dsp_thread()
}
buf_in_offset -= sizeof(buf_in);
}
for(int i=0;i<SND_PCHAN;i++)
for(int j=0;j<read/(SND_RCHAN*sizeof(buf_in[0]));j++) {
for(int i=0;i<read/(SND_RCHAN*sizeof(buf_in[0]));i++) {
double sample = 0.0;
for(int k=0;k<SND_RCHAN;k++)
sample += (double)buf_in[SND_RCHAN*j+k];
std::complex<double> lockin_out = lockin[i].update(sample);
for(int j=0;j<SND_RCHAN;j++) {
double sample_d = (double)buf_in[SND_RCHAN*i+j];
sample += sample_d;
if(std::abs(sample_d) > 0.99*pow(2.0, SND_BITS-1))
// display the clipped indicator for about one second
clipped_count = SND_RATE;
}
if(clipped_count > 0) {
clipped_count--;
clipped = true;
} else
clipped = false;
if(!li_hist_pause[i]) {
li_count[i]++;
if(li_count[i] == 200) {
li_count[i] = 0;
double sample_abs = std::abs(sample);
if(sample_abs > peak_running)
peak_running = sample_abs;
peak_count++;
if(peak_count == SND_RATE/10) {
peak_count = 0;
peak = peak_running/(pow(2.0, SND_BITS-1)*SND_RCHAN);
peak_running = 0.0;
}
phase_t trig_phase = lockin[in_wave_trigger].get_phase();
bool trigger = trig_phase > last_trig_phase;
last_trig_phase = trig_phase;
switch(in_wave_state) {
case InWaveState::delay:
in_wave_count++;
if(in_wave_count == SND_RATE/10)
in_wave_state = InWaveState::wait_trigger;
break;
case InWaveState::wait_trigger:
if(trigger) {
in_wave_count = 0;
in_wave_state = InWaveState::capturing;
}
break;
case InWaveState::capturing:
in_wave_buf[in_wave_count++] = sample/(pow(2.0, SND_BITS-1)*SND_RCHAN);
if(in_wave_count == HIST_DEPTH) {
{
std::lock_guard<std::mutex> guard(in_wave_mutex);
std::memcpy(in_wave, in_wave_buf, sizeof(in_wave));
}
in_wave_count = 0;
in_wave_state = InWaveState::delay;
}
break;
}
for(int j=0;j<SND_PCHAN;j++) {
std::complex<double> lockin_out = lockin[j].update(sample);
if(!li_hist_pause[j]) {
li_count[j]++;
if(li_count[j] == 200) {
li_count[j] = 0;
std::lock_guard<std::mutex> guard(li_hist_mutex);
std::memmove(&li_hist_mag[i][0], &li_hist_mag[i][1], (HIST_DEPTH-1)*sizeof(float));
li_hist_mag[i][HIST_DEPTH-1] = std::abs(lockin_out);
std::memmove(&li_hist_phase[i][0], &li_hist_phase[i][1], (HIST_DEPTH-1)*sizeof(float));
li_hist_phase[i][HIST_DEPTH-1] = std::arg(lockin_out);
std::memmove(&li_hist_mag[j][0], &li_hist_mag[j][1], (HIST_DEPTH-1)*sizeof(float));
li_hist_mag[j][HIST_DEPTH-1] = std::abs(lockin_out);
std::memmove(&li_hist_phase[j][0], &li_hist_phase[j][1], (HIST_DEPTH-1)*sizeof(float));
li_hist_phase[j][HIST_DEPTH-1] = std::arg(lockin_out);
}
}
}
}
@ -243,6 +310,31 @@ int main(int argc, char* argv[])
amplitude[i] = amplitude_l;
}
}
if(ImGui::CollapsingHeader("Input monitor")) {
ImGui::AlignTextToFramePadding();
ImGui::Text("level:");
ImGui::SameLine();
ImGui::ProgressBar((float)peak, ImVec2(30.0f*ImGui::GetFontSize(), 0.0f));
if(clipped) {
ImGui::SameLine();
ImGui::TextColored(ImVec4(1.0f, 0.0f, 0.0f, 1.0f), "clipped!");
}
ImGui::AlignTextToFramePadding();
ImGui::Text("trigger:");
ImGui::SameLine();
int in_wave_trigger_l = in_wave_trigger;
char str[64];
for(int i=0;i<SND_PCHAN;i++) {
sprintf(str, "ch%d", i);
ImGui::RadioButton(str, &in_wave_trigger_l, i);
if(i < (SND_PCHAN-1)) ImGui::SameLine();
}
in_wave_trigger = in_wave_trigger_l;
{
std::lock_guard<std::mutex> guard(in_wave_mutex);
ImGui::PlotLines("waveform", in_wave, HIST_DEPTH, 0, 0, -1.0f, 1.0f, ImVec2(0.0f, 200.0f));
}
}
if(ImGui::CollapsingHeader("Demodulation", ImGuiTreeNodeFlags_DefaultOpen)) {
for(int i=0;i<SND_PCHAN;i++) {
char str[64];