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draw lines between points in spectrum

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This commit is contained in:
Ahmet Inan 2015-01-15 11:04:41 +01:00
parent 19149cb428
commit 42aaf6b4cf
1 changed files with 20 additions and 4 deletions
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24
app/src/main/rs/stft.rsh
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@ -83,6 +83,19 @@ void enable_analyzer(int enable)
show_rainbow();
}
// only made for abs(x0-x1) <= 1
static void draw_line(int x0, int y0, int x1, int y1)
{
int a0 = min(y0, (y0 + y1) / 2);
int a1 = max(y0, (y0 + y1) / 2);
for (int y = a0; y <= a1; ++y)
spectrum_buffer[spectrum_width * y + x0] = rgb(255, 255, 255);
int b0 = min((y0 + y1) / 2, y1);
int b1 = max((y0 + y1) / 2, y1);
for (int y = b0; y <= b1; ++y)
spectrum_buffer[spectrum_width * y + x1] = rgb(255, 255, 255);
}
static void spectrum_analyzer(int amplitude)
{
const int M = 7;
@ -133,13 +146,16 @@ static void spectrum_analyzer(int amplitude)
spectrogram_buffer[i] = rainbow(v);
}
fade_spectrum();
for (int b = 0; b < radix2_N / 2; ++b) {
for (int b = 0, i0, j0; b < radix2_N / 2; ++b) {
float power = min(pown(cabs(output[b]) / 127.0f, 2), 1.0f);
float dB = 10.0f * log10(max(0.000001f, power));
float v = clamp((60.0f + dB) / 60.0f, 0.0f, 1.0f);
int i = (b * spectrum_width) / (radix2_N / 2);
int j = (spectrum_height - 1) - (spectrum_height - 1) * v;
spectrum_buffer[spectrum_width * j + i] = rgb(255, 255, 255);
int i1 = (b * spectrum_width) / (radix2_N / 2);
int j1 = (spectrum_height - 1) - (spectrum_height - 1) * v;
if (b)
draw_line(i0, j0, i1, j1);
i0 = i1;
j0 = j1;
}
freq_marker(1100 * M);
freq_marker(1300 * M);