Help with wav file...

music.cpp

#include <iostream> // for cout/cin
#include <fstream> // for files
#include <cstdint> // for fixed ints
#include <cmath> // for sin funct

using namespace std;
#define FORMAT_AUDIO 1
#define FORMAT_SIZE 16

struct wave_header{
    // Header
    char      riff[4];  // "RIFF"
    int32_t   file_size; // Tamaño total del archivo a partir del byte 8
    char      wave[4]; // "WAVE"
    // Format
    char      fmt[4]; // "fmt "
    int32_t   format_size; // Tamaño del formato
    int16_t   format_audio; // Formato de audio
    int16_t   num_channels; // Cantidad de canales
    int32_t   sample_rate; // Muestras por segundo
    int32_t   byte_rate; // bytes por segundo
    int16_t   block_align; // block align
    int16_t   bits_per_sample; // bits por muestra
    // Data
    char      data[4]; // "data"
    int32_t   data_size; // Tamaño total de los datos
};

void write_header(ofstream &music_file ,int16_t bits, int32_t samples, int32_t duration){
    wave_header wav_header{};
    int16_t channels_quantity = 1;

    int32_t total_data = duration * samples * channels_quantity * bits/8;
    int32_t file_data = 4 + 8 + FORMAT_SIZE + 8 + total_data;

    wav_header.riff[0] = 'R';
    wav_header.riff[1] = 'I';
    wav_header.riff[2] = 'F';
    wav_header.riff[3] = 'F';

    wav_header.file_size = file_data;

    wav_header.wave[0] = 'W';
    wav_header.wave[1] = 'A';
    wav_header.wave[2] = 'V';
    wav_header.wave[3] = 'E';

    wav_header.fmt[0] = 'f';
    wav_header.fmt[1] = 'm';
    wav_header.fmt[2] = 't';
    wav_header.fmt[3] = ' ';

    wav_header.format_size = FORMAT_SIZE;
    wav_header.format_audio = FORMAT_AUDIO;
    wav_header.num_channels = channels_quantity;
    wav_header.sample_rate = samples;
    wav_header.byte_rate = samples * channels_quantity * bits/8;
    wav_header.block_align = static_cast<int16_t>(channels_quantity * bits / 8);
    wav_header.bits_per_sample = bits;

    wav_header.data[0] = 'd';
    wav_header.data[1] = 'a';
    wav_header.data[2] = 't';
    wav_header.data[3] = 'a';

    wav_header.data_size = total_data;

    music_file.write((char*)&wav_header, sizeof(wave_header));
}

int main(int argc, char const *argv[]) {
    int16_t bits = 8;
    int32_t samples = 44100;
    int32_t duration = 10;
    ofstream music_file("music.wav", ios::out | ios::binary);
    int32_t  frame_total = samples * duration;
    auto* audio = new int16_t[frame_total];

    double chor = 493.9;
    for(int i = 0; i < frame_total; i++){
        audio[i] = static_cast<int16_t>(255 * sin(chor + i));
    }

    write_header(music_file, bits, samples, duration);
    music_file.write((char*)&audio,sizeof(audio));

    return 0;
}