Reading and manipulating a WAV file in C++
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I'm trying to write a simple program to read a WAV file in C++ and get data like sample rate and bit depth. At some point I want to use this to manipulate the data to create an audio plugin, but I want to understand this first.
#include <iostream>
#include <string>
#include <fstream>
#include <ostream>
using namespace std;
struct wavfile {
char id[4];
int totallength;
char wavefmt[8];
int format;
short pcm;
short channels;
int frequency;
int bytes_per_second;
short bytes_by_capture;
short bits_per_sample;
char data[4];
int bytes_in_data;
};
int main () {
FILE * wfile;
std::ofstream ofs;
wfile = ofs.open("tes.wav",std::ofstream::binary | std::ofstream::app); // line 31
ofs.close();
return 0;
}
When I try to run it it keep saying "assigning to 'FILE *' (aka '__sFILE *') from incompatible type 'void'"
How can I get it to open the wave file, read the data, so I can define it as a within the struct wavfile and print it back out?
Any help would be greatly appreciated, even just pointing me in the right direction or to a good resource. Thanks in advance!
c++ audio
asked Nov 16 '18 at 22:59
Jon OrganJon Organ
11
add a comment |
I'm trying to write a simple program to read a WAV file in C++ and get data like sample rate and bit depth. At some point I want to use this to manipulate the data to create an audio plugin, but I want to understand this first.
#include <iostream>
#include <string>
#include <fstream>
#include <ostream>
using namespace std;
struct wavfile {
char id[4];
int totallength;
char wavefmt[8];
int format;
short pcm;
short channels;
int frequency;
int bytes_per_second;
short bytes_by_capture;
short bits_per_sample;
char data[4];
int bytes_in_data;
};
int main () {
FILE * wfile;
std::ofstream ofs;
wfile = ofs.open("tes.wav",std::ofstream::binary | std::ofstream::app); // line 31
ofs.close();
return 0;
}
When I try to run it it keep saying "assigning to 'FILE *' (aka '__sFILE *') from incompatible type 'void'"
How can I get it to open the wave file, read the data, so I can define it as a within the struct wavfile and print it back out?
Any help would be greatly appreciated, even just pointing me in the right direction or to a good resource. Thanks in advance!
c++ audio
asked Nov 16 '18 at 22:59
Jon OrganJon Organ
11
Hello,std::ofstream::openreturns void so you cannot set the value of a variable using its return value. More overstd::ofsteamis an out file stream so you cannot read things from it. I think you're looking forstd::ifstream(cplusplus.com/reference/istream/istream/read). And you don't need one of your variable, why do you have aFILE*and anstd::ofstream? If you want to read your file, either usestd::ifstreamwhich belongs the C++ standard library or useFILEwhich belongs to C library but not both in the same time.
– Siliace
Nov 16 '18 at 23:14
What manual are you working from?
– Galik
Nov 16 '18 at 23:17
add a comment |
I'm trying to write a simple program to read a WAV file in C++ and get data like sample rate and bit depth. At some point I want to use this to manipulate the data to create an audio plugin, but I want to understand this first.
#include <iostream>
#include <string>
#include <fstream>
#include <ostream>
using namespace std;
struct wavfile {
char id[4];
int totallength;
char wavefmt[8];
int format;
short pcm;
short channels;
int frequency;
int bytes_per_second;
short bytes_by_capture;
short bits_per_sample;
char data[4];
int bytes_in_data;
};
int main () {
FILE * wfile;
std::ofstream ofs;
wfile = ofs.open("tes.wav",std::ofstream::binary | std::ofstream::app); // line 31
ofs.close();
return 0;
}
When I try to run it it keep saying "assigning to 'FILE *' (aka '__sFILE *') from incompatible type 'void'"
How can I get it to open the wave file, read the data, so I can define it as a within the struct wavfile and print it back out?
Any help would be greatly appreciated, even just pointing me in the right direction or to a good resource. Thanks in advance!
c++ audio
asked Nov 16 '18 at 22:59
Jon OrganJon Organ
11
I'm trying to write a simple program to read a WAV file in C++ and get data like sample rate and bit depth. At some point I want to use this to manipulate the data to create an audio plugin, but I want to understand this first.
#include <iostream>
#include <string>
#include <fstream>
#include <ostream>
using namespace std;
struct wavfile {
char id[4];
int totallength;
char wavefmt[8];
int format;
short pcm;
short channels;
int frequency;
int bytes_per_second;
short bytes_by_capture;
short bits_per_sample;
char data[4];
int bytes_in_data;
};
int main () {
FILE * wfile;
std::ofstream ofs;
wfile = ofs.open("tes.wav",std::ofstream::binary | std::ofstream::app); // line 31
ofs.close();
return 0;
}
When I try to run it it keep saying "assigning to 'FILE *' (aka '__sFILE *') from incompatible type 'void'"
How can I get it to open the wave file, read the data, so I can define it as a within the struct wavfile and print it back out?
Any help would be greatly appreciated, even just pointing me in the right direction or to a good resource. Thanks in advance!
c++ audio
c++ audio
asked Nov 16 '18 at 22:59
Jon OrganJon Organ
11
asked Nov 16 '18 at 22:59
Jon OrganJon Organ
11
edited Nov 16 '18 at 23:12
Jon Organ
asked Nov 16 '18 at 22:59
Jon OrganJon Organ
11
asked Nov 16 '18 at 22:59
Jon OrganJon Organ
11
asked Nov 16 '18 at 22:59
Jon OrganJon Organ
11
11
Hello,std::ofstream::openreturns void so you cannot set the value of a variable using its return value. More overstd::ofsteamis an out file stream so you cannot read things from it. I think you're looking forstd::ifstream(cplusplus.com/reference/istream/istream/read). And you don't need one of your variable, why do you have aFILE*and anstd::ofstream? If you want to read your file, either usestd::ifstreamwhich belongs the C++ standard library or useFILEwhich belongs to C library but not both in the same time.
– Siliace
Nov 16 '18 at 23:14
What manual are you working from?
– Galik
Nov 16 '18 at 23:17
add a comment |
Hello,std::ofstream::openreturns void so you cannot set the value of a variable using its return value. More overstd::ofsteamis an out file stream so you cannot read things from it. I think you're looking forstd::ifstream(cplusplus.com/reference/istream/istream/read). And you don't need one of your variable, why do you have aFILE*and anstd::ofstream? If you want to read your file, either usestd::ifstreamwhich belongs the C++ standard library or useFILEwhich belongs to C library but not both in the same time.
– Siliace
Nov 16 '18 at 23:14
What manual are you working from?
– Galik
Nov 16 '18 at 23:17
Hello,
std::ofstream::open returns void so you cannot set the value of a variable using its return value. More over std::ofsteam is an out file stream so you cannot read things from it. I think you're looking for std::ifstream (cplusplus.com/reference/istream/istream/read). And you don't need one of your variable, why do you have a FILE* and an std::ofstream? If you want to read your file, either use std::ifstream which belongs the C++ standard library or use FILE which belongs to C library but not both in the same time.– Siliace
Nov 16 '18 at 23:14
Hello,
std::ofstream::open returns void so you cannot set the value of a variable using its return value. More over std::ofsteam is an out file stream so you cannot read things from it. I think you're looking for std::ifstream (cplusplus.com/reference/istream/istream/read). And you don't need one of your variable, why do you have a FILE* and an std::ofstream? If you want to read your file, either use std::ifstream which belongs the C++ standard library or use FILE which belongs to C library but not both in the same time.– Siliace
Nov 16 '18 at 23:14
What manual are you working from?
– Galik
Nov 16 '18 at 23:17
What manual are you working from?
– Galik
Nov 16 '18 at 23:17
add a comment |
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Hello,
std::ofstream::openreturns void so you cannot set the value of a variable using its return value. More overstd::ofsteamis an out file stream so you cannot read things from it. I think you're looking forstd::ifstream(cplusplus.com/reference/istream/istream/read). And you don't need one of your variable, why do you have aFILE*and anstd::ofstream? If you want to read your file, either usestd::ifstreamwhich belongs the C++ standard library or useFILEwhich belongs to C library but not both in the same time.– Siliace
Nov 16 '18 at 23:14
What manual are you working from?
– Galik
Nov 16 '18 at 23:17