Hello guys, I’m using the new Audio Capture component to record user voice and save it as a .wav file with the following blueprint setup.
The resulting wav file is a Stereo wav file with 48000Hz Sampling Rate and 16 bit however I need it to be a Mono wav file with just one channel instead of 2. I have been looking for any options in the Submix, Attenuation and Audio Capture but no hope to make the recorded wav a Mono. Can anyone help with this ?
I managed to convert the recorded wav file from Stereo to Mono. I had to learn about how a .wav file is stored in bytes and change the file header values. I also ignored the right stereo channel and just wrote the left channel in my new .wav file. I implemented a c++ function to handle this
void :StereoToMono(TArray<uint8> stereoWavBytes, TArray<uint8>& monoWavBytes)
{
//Change wav headers
for (int i = 0; i < 44; i++)
{
//NumChannels starts from 22 to 24
if (i == 22)
{
short NumChannels = (*(short*)&stereoWavBytes[i]) / 2;
monoWavBytes.Append((uint8*)&NumChannels, sizeof(NumChannels));
i++;
}
//ByteRate starts from 28 to 32
else if (i == 28)
{
int ByteRate = (*(int*)&stereoWavBytes[i]) / 2;
monoWavBytes.Append((uint8*)&ByteRate, sizeof(ByteRate));
i += 3;
}
//BlockAlign starts from 32 to 34
else if (i == 32)
{
short BlockAlign = (*(short*)&stereoWavBytes[i]) / 2;
monoWavBytes.Append((uint8*)&BlockAlign, sizeof(BlockAlign));
i++;
}
//SubChunkSize starts from 40 to 44
else if (i == 40)
{
int SubChunkSize = (*(int*)&stereoWavBytes[i]) / 2;
monoWavBytes.Append((uint8*)&SubChunkSize, sizeof(SubChunkSize));
i += 3;
}
else
{
monoWavBytes.Add(stereoWavBytes[i]);
}
}
//Copies only the left channel and ignores the right channel
for (int i = 44; i < stereoWavBytes.Num(); i += 4)
{
monoWavBytes.Add(stereoWavBytes[i]);
monoWavBytes.Add(stereoWavBytes[i+1]);
}
}Excuse me Zexus: Submix Effect Preset and Submix to Record, how do you get the two variables
They are basic classes that I created from the ‘New’ in the Content Browser so just create them and reference them in your Blueprints as far as I remember
Thanks ,u help me a lot!
Hello! I was wondering, when do you run this function? Before saving the .wav file or after? Thanks so much for your contibution!
The .wav file is saved after releasing the spacebar