Write WAV files.

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>

#define FREQUENCE 44100
#define BITPERSAMPLE 16

typedef int int32;
typedef short int16;
typedef char int8;

struct WavHeader
{
    int8 FileTypeBlocID[4];
    int32 FileSize;
    int8 FileFormatID[4];
};

struct WavFmt
{
    int8 FormatBlocID[4];
    int32 BlocSize;
    int16 AudioFormat;
    int16 NbrCanaux;
    int32 Frequence;
    int32 BytePerSec;
    int16 BytePerBloc;
    int16 BitsPerSample;
};

FILE * wavfile_open( const char *filename )
{
    struct WavHeader head = {{'R','I','F','F'},0,{'W','A','V','E'}};
    struct WavFmt Fmt = {{'f','m','t',' '},16,1,1,FREQUENCE,FREQUENCE*BITPERSAMPLE/8,BITPERSAMPLE/8,BITPERSAMPLE};
    FILE* F;
    F = fopen(filename,"wb");
    if(!F) 
        return 0;
    fwrite(&head,sizeof(head),1,F);
    fwrite(&Fmt,sizeof(Fmt),1,F);
    return F;
}

void wavfile_write(FILE *F, int16* data, int32 length )
{
    char subhead[5] = "data";
    fwrite(subhead,4,1,F);
    fwrite(&length,sizeof(length),1,F);
    fwrite(data,sizeof(short),length,F);
}

void wavfile_close( FILE *file )
{
    int file_length = ftell(file);
    int32 FileSize = file_length - 8;
    fseek(file,4,SEEK_SET);
    fwrite(&FileSize,sizeof(FileSize),1,file);
    fclose(file);
}

int main()
{
    FILE* F;
    int i;
    int nbsecondes = 10;
    int updown = 1;
    int16* datas = malloc(nbsecondes*FREQUENCE*sizeof(int16));
    for(i=0;i<nbsecondes*FREQUENCE;i++)
    {
        int largeurcarre = ((i/FREQUENCE)+1)*100;
        if (i%largeurcarre==0)
            updown= -1*updown;
        datas[i] = updown*16384;
    }
    F = wavfile_open("sound.wav");
    if (!F)
        return -1;
    wavfile_write(F,datas,nbsecondes*FREQUENCE);
    free(datas);
    wavfile_close(F);
    return 0;
}

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