Problem with ReadData

FMOD Engine
1

Hello everyone!
I’m attempting to develop a granular synthesizer for the procedural sound generation software I’m working on (i’m using FMOD Core library). I need to copy the contents of an audio file into an array to be able to extract grains and play them separately with createSound and playSound, but the example code I found in the glossary does not seem to pass the data in the buffer correctly. Could anyone help me? This is a simple test code I’m using:

#include “iostream”
#include “fmod.hpp”
#include “fmod_errors.h”

int check(FMOD_RESULT result) {
if (result != FMOD_OK)
{
std::cout << “FMOD error!\n” << result << " " << FMOD_ErrorString(result) << std::endl;
exit(-1);
}
else {
return 0;
}
}

int main() {
FMOD::System* system;
FMOD::System_Create(&system);
check(system->init(128, FMOD_INIT_NORMAL, 0));

FMOD::Sound* sound;
unsigned int length;
char* buffer;

check(system->createSound("Sounds/tinfoil.wav", FMOD_DEFAULT | FMOD_OPENONLY, nullptr, &sound));
check(sound->getLength(&length, FMOD_TIMEUNIT_RAWBYTES));

buffer = new char[length];
check(sound->readData(buffer, length, nullptr));

check(sound->release());

FMOD_CREATESOUNDEXINFO info;
info.length = length;
FMOD::Sound* copy;
check(system->createSound(buffer, FMOD_OPENMEMORY, &info, &copy));

FMOD::Channel* channel;
check(system->playSound(copy, NULL, false, &channel));

int exit = 1;

while (exit != 0) {
	std::cin >> exit;
}

check(copy->release());

delete[] buffer;

check(system->close());
check(system->release());

}

Thanks for your attention!

2

Hi,

What version of FMOD are you using and where did you find the example code?

3

Hi Connor,
i’m using version 2.02 of FMOD API, here is the example:
https://www.fmod.com/docs/2.02/api/glossary.html#reading-sound-data

4

Hi, thank you for sharing that.

Could you elaborate on:

What are the error messages you are seeing in your check()?

5

I used breakpoints for debugging and that is what the buffer gets in ReadData (sorry for using italian language on Visual Studio):

Buffer 2
Buffer 21920×1712 406 KB

Buffer
Buffer1920×1712 272 KB

I see an error message when I use buffer in createSound:

Error message
Error message1920×1712 346 KB

[image]

Thanks for helping!

6

Hi,

Thanks for the screenshots, and absolutely no worries for the Italian!

I have made a note that there isn’t much information on this topic in our documentation.

There are a few more FMOD_MODE flags required so that FMOD makes the sound using the provided data rather than looking for a file.

system->createSound(buffer, FMOD_OPENMEMORY | FMOD_OPENRAW | FMOD_CREATESAMPLE, &info, &copy);

Some of these flags have FMOD_CREATESOUNDEXINFO components that need to be set to allow for the successful creation of the sound. A full list of the FMOD_MODE can be found under FMOD API | Core API Reference - Common

Other required parameters are:

So our FMOD_CREATESOUNDEXINFO should look like this:

FMOD_SOUND_TYPE type;
FMOD_SOUND_FORMAT format;
int channels;
sound->getFormat(&type, &format, &channels, 0);
int freq = 0;
system->getSoftwareFormat(&freq, 0, 0);

FMOD_CREATESOUNDEXINFO info = FMOD_CREATESOUNDEXINFO();
info.length = length;
info.cbsize = sizeof(FMOD_CREATESOUNDEXINFO);
info.format = format;
info.numchannels = channels;
info.defaultfrequency = freq;

Now we have all the requirements met for our flags you should be able to play the sound retrieved from readData()

Hope this helps!