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added frequency markers for 1100, 1300, 1500 and 2300 Hz

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This commit is contained in:
Ahmet Inan 2015-01-08 15:48:00 +01:00
parent 749972d0e5
commit f0816a8426
1 changed files with 14 additions and 1 deletions
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15
app/src/main/rs/stft.rsh
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@ -32,13 +32,22 @@ static inline uchar4 rainbow(float v)
return rgb(255.0f * sqrt(r), 255.0f * sqrt(g), 255.0f * sqrt(b));
}
static void freq_marker(int freq)
{
for (int j = 0; j < spectrum_height; ++j) {
int i = (radix2_N * freq) / sample_rate;
spectrum_buffer[spectrum_width * j + i] = rgb(255, 255, 255);
}
}
static void spectrum_analyzer(float amplitude)
{
const int M = 7;
static int n;
static complex_t input[radix2_N];
static complex_t output[radix2_N];
input[(n/7)&(radix2_N-1)] += complex(stft_w[n] * amplitude, 0.0f);
input[(n/M)&(radix2_N-1)] += complex(stft_w[n] * amplitude, 0.0f);
if (++n >= stft_N) {
n = 0;
// yep, were wasting 3x performance
@ -58,6 +67,10 @@ static void spectrum_analyzer(float amplitude)
float v = clamp((60.0f + dB) / 60.0f, 0.0f, 1.0f);
spectrum_buffer[i] = rainbow(v);
}
freq_marker(1100 * M);
freq_marker(1300 * M);
freq_marker(1500 * M);
freq_marker(2300 * M);
#if 0
for (int j = spectrum_height / 2; j < spectrum_height; ++j)
for (int i = 0; i < spectrum_width; ++i)