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Adjustable dynamic range

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This commit is contained in:
Alexander Kojevnikov 2012-09-18 22:37:49 -07:00
parent c6dc7afcea
commit 1e5e936824
2 changed files with 14 additions and 7 deletions
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19
src/spek-spectrogram.cc
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@ -44,7 +44,10 @@ END_EVENT_TABLE()
enum enum
{ {
THRESHOLD = -92, MAX_RANGE = 0,
MIN_RANGE = -140,
URANGE = -20,
LRANGE = -100,
NFFT = 2048, NFFT = 2048,
BANDS = NFFT / 2 + 1, BANDS = NFFT / 2 + 1,
LPAD = 60, LPAD = 60,
@ -68,7 +71,9 @@ SpekSpectrogram::SpekSpectrogram(wxFrame *parent) :
sample_rate(0), sample_rate(0),
palette(RULER, BANDS), palette(RULER, BANDS),
image(1, 1), image(1, 1),
prev_width(-1) prev_width(-1),
urange(URANGE),
lrange(LRANGE)
{ {
SetBackgroundStyle(wxBG_STYLE_CUSTOM); SetBackgroundStyle(wxBG_STYLE_CUSTOM);
SetFocus(); SetFocus();
@ -155,10 +160,10 @@ void SpekSpectrogram::on_have_sample(SpekHaveSampleEvent& event)
} }
// TODO: check image size, quit if wrong. // TODO: check image size, quit if wrong.
double range = log(1.0 - THRESHOLD); double range = log(1.0 + this->urange - this->lrange);
for (int y = 0; y < bands; y++) { for (int y = 0; y < bands; y++) {
double value = MAX(THRESHOLD, values[y]); double value = MIN(this->urange, MAX(this->lrange, values[y]));
double level = log(1.0 - THRESHOLD + value) / range; double level = log(1.0 + value - this->lrange) / range;
uint32_t color = spek_palette_spectrum(level); uint32_t color = spek_palette_spectrum(level);
this->image.SetRGB( this->image.SetRGB(
sample, sample,
@ -323,9 +328,9 @@ void SpekSpectrogram::render(wxDC& dc)
// TRANSLATORS: keep "-00" unchanged, it's used to calc the text width // TRANSLATORS: keep "-00" unchanged, it's used to calc the text width
_("-00 dB"), _("-00 dB"),
density_factors, density_factors,
-THRESHOLD, this->urange - this->lrange,
3.0, 3.0,
(h - TPAD - BPAD) / (double)THRESHOLD, (h - TPAD - BPAD) / (double)(this->lrange - this->urange),
h - TPAD - BPAD, h - TPAD - BPAD,
density_formatter density_formatter
); );

2
src/spek-spectrogram.hh
View File

@ -52,6 +52,8 @@ private:
wxImage palette; wxImage palette;
wxImage image; wxImage image;
int prev_width; int prev_width;
int urange;
int lrange;
DECLARE_EVENT_TABLE() DECLARE_EVENT_TABLE()
}; };