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https://github.com/jart/cosmopolitan.git
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81 lines
2.6 KiB
C
81 lines
2.6 KiB
C
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#if 0
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/*─────────────────────────────────────────────────────────────────╗
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│ To the extent possible under law, Justine Tunney has waived │
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│ all copyright and related or neighboring rights to this file, │
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│ as it is written in the following disclaimers: │
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│ • http://unlicense.org/ │
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│ • http://creativecommons.org/publicdomain/zero/1.0/ │
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╚─────────────────────────────────────────────────────────────────*/
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#endif
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#include <cosmoaudio.h>
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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/**
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* @fileoverview plays pure A.440 tone on speakers for 1 second
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* @see https://en.wikipedia.org/wiki/A440_%28pitch_standard%29
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*/
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#define SAMPLING_RATE 44100
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#define WAVE_INTERVAL 440
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#define CHANNELS 2
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#define LOUDNESS .3
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#define DEBUG_LOG 1
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int main() {
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struct CosmoAudioOpenOptions cao = {0};
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cao.sizeofThis = sizeof(struct CosmoAudioOpenOptions);
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cao.deviceType = kCosmoAudioDeviceTypePlayback;
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cao.sampleRate = SAMPLING_RATE;
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cao.debugLog = DEBUG_LOG;
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cao.channels = CHANNELS;
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int status;
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struct CosmoAudio *ca;
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status = cosmoaudio_open(&ca, &cao);
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if (status != COSMOAUDIO_SUCCESS) {
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fprintf(stderr, "failed to open audio: %d\n", status);
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return 1;
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}
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float buf[256 * CHANNELS];
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for (int g = 0; g < SAMPLING_RATE;) {
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int frames = 1;
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status = cosmoaudio_poll(ca, NULL, &frames);
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if (status != COSMOAUDIO_SUCCESS) {
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fprintf(stderr, "failed to poll output: %d\n", status);
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return 2;
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}
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if (frames > 256)
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frames = 256;
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if (frames > SAMPLING_RATE - g)
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frames = SAMPLING_RATE - g;
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for (int f = 0; f < frames; ++f) {
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float t = (float)g++ / SAMPLING_RATE;
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float s = sinf(2 * M_PIf * WAVE_INTERVAL * t);
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for (int c = 0; c < CHANNELS; c++)
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buf[f * CHANNELS + c] = s * LOUDNESS;
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}
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status = cosmoaudio_write(ca, buf, frames);
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if (status != frames) {
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fprintf(stderr, "failed to write output: %d\n", status);
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return 3;
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}
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}
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status = cosmoaudio_flush(ca);
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if (status != COSMOAUDIO_SUCCESS) {
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fprintf(stderr, "failed to flush output: %d\n", status);
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return 4;
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}
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status = cosmoaudio_close(ca);
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if (status != COSMOAUDIO_SUCCESS) {
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fprintf(stderr, "failed to close audio: %d\n", status);
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return 5;
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}
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}
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