Unreal Engine C++ Base64 to Audio

Development Programming & Scripting C++
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Hello everyone.
I need to convert base64 string to audio. I get this string from blueprint and I use this string inside cpp code. I want to convert and play this sound. But I do not know how to do this. I tried convert to soundwave but it did not work. I search some codes but they didn’t work. Can anyone know sth about this situation? Where is my mistake? Here is my codes

USoundWave* AConvertSound::WavDataToSoundwave(const FString& Base64String)
{
    TArray<uint8> Data;
    FBase64::Decode(Base64String, Data);
    FWaveModInfo WaveInfo;
    if (WaveInfo.ReadWaveInfo(Data.GetData(), Data.Num()))
    {
        USoundWave* SoundWave = NewObject<USoundWave>();

        SoundWave->SetSampleRate(*WaveInfo.pSamplesPerSec);
        SoundWave->NumChannels = *WaveInfo.pChannels;

        const int32 BytesDataPerSecond = *WaveInfo.pChannels * (*WaveInfo.pBitsPerSample / 8.f) * *WaveInfo.pSamplesPerSec;
        if (BytesDataPerSecond)
        {
              SoundWave->Duration = WaveInfo.SampleDataSize / BytesDataPerSecond;
        }

        SoundWave->RawPCMDataSize = WaveInfo.SampleDataSize;

        SoundWave->RawPCMData = static_cast<uint8*>(FMemory::Malloc(WaveInfo.SampleDataSize));
        FMemory::Memcpy(SoundWave->RawPCMData, WaveInfo.SampleDataStart, WaveInfo.SampleDataSize);
        return SoundWave;
    }
    else
    {
        return nullptr;
    }
}

void AConvertSound::PlayBase64Sound(const FString& Base64String)
{
    USoundWave* SoundWave = WavDataToSoundwave(Base64String);
    if (SoundWave)
    {
        UE_LOG(LogTemp, Error, TEXT("If state"));
        UGameplayStatics::PlaySound2D(this, SoundWave);
    }
    else
    {
        UE_LOG(LogTemp, Error, TEXT("Sound can not created!"));
    }
}

Thanks.