play 8 bit unsigned PCM audio in SDL with C

sdl-audio.c

#include <emscripten.h>

#include <SDL2/SDL.h>
#include <stdint.h>
#include <stdio.h>

#define BUFFER_SIZE 4096

int main(int argc, char **argv) {
    if (SDL_Init(SDL_INIT_AUDIO)) {
        fprintf(stderr, "SDL_Init(): %s\n", SDL_GetError());
        return 1;
    }

    SDL_AudioSpec wanted;

    wanted.freq = 44100;
    wanted.format = AUDIO_U8;
    wanted.channels = 2;
    wanted.silence = 0;
    wanted.samples = 1024;
    wanted.callback = NULL;

    if (SDL_OpenAudio(&wanted, NULL) < 0) {
        fprintf(stderr, "SDL_OpenAudio(): %s\n", SDL_GetError());
        return 1;
    }

    FILE *fp_pcm = fopen("./2.raw", "rb");

    if (fp_pcm == NULL) {
        fprintf(stderr, "can\'t open 2.raw");
        return 1;
    }

    char *pcm_buffer = (char *)malloc(BUFFER_SIZE);

    SDL_PauseAudio(0);

    emscripten_sleep(1000);

    while (1) {
        if (fread(pcm_buffer, 1, BUFFER_SIZE, fp_pcm) < 1) {
            break;
        }

        SDL_QueueAudio(1, pcm_buffer, BUFFER_SIZE);

        float bytesPerSecond = (44100 * 8 * 2) / 8;

        SDL_Delay(((int) SDL_GetQueuedAudioSize(1) / bytesPerSecond * 1000) / 2);
        //emscripten_sleep(((int) SDL_GetQueuedAudioSize(1) / bytesPerSecond * 1000) / 2);
    }

    free(pcm_buffer);
    fclose(fp_pcm);
    SDL_Quit();

    return 0;
}