<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def encode_float(encoder, pcm, frame_size, max_data_bytes):
 """Encodes an Opus frame from floating point input"""


    pcm = ctypes.cast(pcm, c_float_pointer)
    data = (ctypes.c_char * max_data_bytes)()

    result = _encode_float(encoder, pcm, frame_size, data, max_data_bytes)
    if result < 0:
        raise OpusError(result)

    return array.array('c', data[:result]).tostring()