C++ audio file converter - c++

Question

I have a G711 codec, and i would like to convert a wav file and save this. I read a sample.wav file, and convert it with the G711 ITU-T codec, and save the encoded data to an output.wav file.
Here is my code:
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include "G711.h"
#include <vector>
using namespace std;
// WAVE PCM soundfile format (you can find more in https://ccrma.stanford.edu/courses/422/projects/WaveFormat/ )
typedef struct header_file
{
char chunk_id[4];
int chunk_size;
char format[4];
char subchunk1_id[4];
int subchunk1_size;
short int audio_format;
short int num_channels;
int sample_rate; // sample_rate denotes the sampling rate.
int byte_rate;
short int block_align;
short int bits_per_sample;
char subchunk2_id[4];
int subchunk2_size; // subchunk2_size denotes the number of samples.
} header;
typedef struct header_file* header_p;
int main()
{
FILE * infile = fopen("sample.wav","rb"); // Open wave file in read mode
FILE * outfile = fopen("Output.wav","wb"); // Create output ( wave format) file in write mode
int BUFSIZE = 512; // BUFSIZE can be changed according to the frame size required (eg:512)
int count = 0; // For counting number of frames in wave file.
short int buff16[BUFSIZE]; // short int used for 16 bit as input data format is 16 bit PCM audio
header_p meta = (header_p)malloc(sizeof(header)); // header_p points to a header struct that contains the wave file metadata fields
int nb; // variable storing number of byes returned
if (infile)
{
fread(meta, 1, sizeof(header), infile);
fwrite(meta,1, sizeof(*meta), outfile);
cout << " Size of Header file is "<<sizeof(*meta)<<" bytes" << endl;
cout << " Sampling rate of the input wave file is "<< meta->sample_rate <<" Hz" << endl;
cout << " Number of samples in wave file are " << meta->subchunk2_size << " samples" << endl;
cout << " ID: " << meta->chunk_id << endl;
cout << "chunk_size" << meta->chunk_size << endl;
cout << "format" << meta->format << endl;
cout << "subchunk1"<<meta->subchunk1_id << endl;
cout << "subchunk1_size"<<meta->subchunk1_size << endl;
cout << "audio_format"<<meta->audio_format<<endl;
cout << "num_channels"<<meta->num_channels<<endl;
cout << "byte_rate"<<meta->byte_rate<<endl;
cout << "block_align"<<meta->block_align<<endl;
cout << "bits_per_sample"<<meta->bits_per_sample<<endl;
cout << "subchunk2_id"<<meta->subchunk2_id<<endl;
while (!feof(infile))
{
nb = fread(buff16,1,BUFSIZE,infile); // Reading data in chunks of BUFSIZE
size_t ds = sizeof(buff16) >> 1;
cout << "ds: " << ds <<endl;
vector<short> vec_src(sizeof(buff16), 0);
vector<unsigned char> vec_dst(ds, 0);
for (int i = 0; i < sizeof(buff16); i++) {
vec_src[i] = buff16[i];
}
short* src = &vec_src[0];
uint8_t* dst = &vec_dst[0];
G711::ALawEncode(dst, buff16, sizeof(buff16));
unsigned char arr[ds];
for (unsigned i = 0; i < ds; i++) {
arr[i] = *(dst + i);
}
count++; // Incrementing Number of frames
/* Insert your processing code here*/
fwrite(arr,sizeof(unsigned char),sizeof(arr),outfile); // Writing read data into output file
}
cout << " Number of frames in the input wave file are " <<count << endl;
}
getchar();
return 0;
}
I dont know very well C++, so please help me. If i run this code i get Output.wav file but i cant play. Whats wrong?