Problem with voice chat with core api (c++)

FMOD Engine
1

Hi,
I’ve been trying to create a voice chat using FMod Core api for the recording and playback of sound. I’ve managed to start the recording, extract the data into a char* (using lock/unlock), and playing the sound by creating a new one everytime.

The problem I’ve been having now though is that the audio, based on what i can hear, is:

  1. Playing slower, even though they have the same frequency.
  2. The audio always gets cut-off by the next clip.

Any help would be appreciated!

1 Like
2

Hi,

Could I please grab a code snippet and what version of FMOD Engine are you using?

The FMOD Engine install does come with a record example which may be useful: "C:\Program Files (x86)\FMOD SoundSystem\FMOD Studio API Windows\api\core\examples\record.cpp"

3

Hi,
Yes, absolutely.

Here is the extraction of the data:

FMOD::System* fSys = ClientChatManager::GetInstance()->GetVoiceChatFmodSystem();
FMOD_RESULT fRes;

unsigned int recordPos = 0;
fRes = fSys->getRecordPosition(myRecordIndex, &recordPos);

if (CheckFMODErr(fRes, "Recording Update Failed"))
        return { 0, nullptr };

unsigned int recordDelta = (recordPos >= lastRecordPos) ? (recordPos - lastRecordPos) : (recordPos + myRecordLength - lastRecordPos);

if (recordDelta == 0)
{
    return { 0, nullptr };
}

unsigned int len = 0;

myRecord->lock(lastRecordPos, min(recordDelta, MAX_AUDIO_SIZE), &currentData, nullptr, &len, 0);
myRecord->unlock(currentData, nullptr, len, 0);

lastRecordPos = recordPos;

char* dataPtr = (char*)currentData + '\0';

return { len, dataPtr };

And here i Reconstruct the sound:

FMOD_RESULT fRes;
FMOD::System* fSys = ClientChatManager::GetInstance()->GetVoiceChatFmodSystem();

if (mySound != nullptr)
    mySound->release();

FMOD_CREATESOUNDEXINFO exinfo = { 0 };
exinfo.cbsize = sizeof(FMOD_CREATESOUNDEXINFO);
exinfo.numchannels = (int)myChannelsCount;
exinfo.format = FMOD_SOUND_FORMAT_PCM16;
exinfo.defaultfrequency = myFreq;
exinfo.length = (myFreq * sizeof(short) * myChannelsCount);

//FMOD::Sound* outPutSound = NULL;
fRes = fSys->createSound(aData, FMOD_OPENMEMORY | FMOD_OPENRAW, &exinfo, &mySound);

if (CheckFMODErr(fRes, "Couldn't create sound (" + std::to_string(aLength) + ")"))
    return;

fRes = fSys->playSound(mySound, 0, false, &myChannel);

if (CheckFMODErr(fRes, "Couldn't create Channel"))
    return;

myChannel->setVolume(myVolume);

As for what version of the core API I am using, I dont really know. How would I check that?