Gst.Buffer.prototype.extract

function extract(offset:gsize, dest:gpointer, size:gsize):gsize {
    // Gjs wrapper for gst_buffer_extract()
}

Copy size bytes starting from offset in buffer to dest.

offset: the offset to extract
dest: the destination address
size: the size to extract
Returns: The amount of bytes extracted. This value can be lower than size when buffer did not contain enough data.