Hello, I'm a beginner in c++, i have to write a program that will take
couple of segments from one wave file, and store them in another wave
file to be played back later.
Here's the code i have written:
#include "stdafx.h"
#include <cstdlib>
#include <iostream>
#include <windows.h>
#include <string>
using namespace std;
int main(int argc, char *argv[])
{
FILE *fp,*fout;
double ts,tk;
ts=0.0;
tk=1.0;
long start_byte,end_byte;
fp = fopen("c:\\start.wav","rb");
string filename="c:\\test.wav";
fout = fopen(filename.c_str(),"wb");
if (fp)
{
BYTE id[5], *sound_buffer; //four bytes to hold 'RIFF'
id[4]='\0';
DWORD size; //32 bit value to hold file size
short format_tag, channels, block_align, bits_per_sample; //our 16
values
DWORD format_length, sample_rate, avg_bytes_sec, data_size, i; //our
32 bit values
fread(id, sizeof(BYTE), 4, fp); //read in first four bytes
fwrite(id,sizeof(BYTE), 4,fout);
if (!strcmp((char *)id, "RIFF"))
{ //we had 'RIFF' let's continue
fread(&size, sizeof(DWORD), 1, fp);
fwrite(&size, sizeof(DWORD), 1, fout);
fread(id, sizeof(BYTE), 4, fp);
fwrite(id, sizeof(BYTE), 4, fout);
if (!strcmp((char *)id,"WAVE"))
{ //this is probably a wave file since it contained "WAVE"
fread(id, sizeof(BYTE), 4, fp);
fwrite(id, sizeof(BYTE), 4, fout);
fread(&format_length, sizeof(DWORD),1,fp);
fwrite(&format_length, sizeof(DWORD),1,fout);
fread(&format_tag, sizeof(short), 1, fp);
fread(&channels, sizeof(short),1,fp); //1 mono, 2 stereo
fread(&sample_rate, sizeof(DWORD), 1, fp); //44100, 22050, etc...
fread(&avg_bytes_sec, sizeof(DWORD), 1, fp);
fread(&block_align, sizeof(short), 1, fp); //probably won't need
this
fread(&bits_per_sample, sizeof(short), 1, fp); //8 bit or 16 bit
file?
fread(id, sizeof(BYTE), 4, fp); //read in 'data'
fwrite(&format_tag, sizeof(short), 1, fout);
fwrite(&channels, sizeof(short),1,fout);
fwrite(&sample_rate, sizeof(DWORD), 1, fout);
fwrite(&avg_bytes_sec, sizeof(DWORD), 1, fout);
fwrite(&block_align, sizeof(short), 1, fout);
fwrite(&bits_per_sample, sizeof(short), 1, fout);
fwrite(id, sizeof(BYTE), 4, fout); //write in 'data'
start_byte=block_align*(int)((double)sample_rate*t s);
end_byte=block_align*(int)((double)sample_rate*tk) ;
cout << start_byte << " " << end_byte << endl;
long new_data_size=end_byte-start_byte;
fread(&data_size, sizeof(DWORD), 1, fp); //how many bytes of sound
data we have
fwrite(&new_data_size, sizeof(DWORD), 1, fout);
sound_buffer = (BYTE *) malloc (sizeof(BYTE) * data_size);
fread(sound_buffer, sizeof(BYTE), data_size, fp);
fwrite(sound_buffer+start_byte, sizeof(BYTE), new_data_size, fout);
ts=2.0;
tk=3.0;
start_byte=block_align*(int)((double)sample_rate*t s);
end_byte=block_align*(int)((double)sample_rate*tk) ;
cout << start_byte << " " << end_byte << endl;
long temp=end_byte-start_byte;
new_data_size=new_data_size+temp;
fwrite(sound_buffer+start_byte, sizeof(BYTE), temp, fout);
}
else
printf("Error: RIFF file but not a wave file\n");
}
else
printf("Error: not a RIFF file\n");
}
//system("PAUSE");
return EXIT_SUCCESS;
}
but as a result of execution of such a program i should receive a file
build of two segements from file, but i get only one written the
ther(second) one is missing. What's wrong with that code?
Any help would be appriciated.
