iicaras

Note Frequencies

🡪 iicaras

For a concert pitch of $\textup{A}_4 = 440 \textup{ hz}$, frequencies for each pitch in 12-TET are calculated using the equation

$$f_x = 2^{\tfrac{x}{12 \textup{ st}}}f_{\textup{A}_4},$$

with $[x] = \textup{ st}$ (semitones) and $x \in \mathbb{Z}$ [^harmonics]. The table below gives the frequency for each note between C0 and B10.

superzazu

#include <stdio.h>
#include <SDL.h>

int main(void) {
    SDL_Init(SDL_INIT_AUDIO);

    // the representation of our audio device in SDL:
    SDL_AudioDeviceID audio_device;

    // opening an audio device:

albertzsigovits

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retvil

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robert-wallis

void captureScreen()
{
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    CGDataProviderRef provider = CGImageGetDataProvider(image_ref);
    CFDataRef dataref = CGDataProviderCopyData(provider);
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    height = CGImageGetHeight(image_ref);
    size_t bpp = CGImageGetBitsPerPixel(image_ref) / 8;
    uint8 *pixels = malloc(width * height * bpp);