void LoadMultiChannel(short[] input, int offset, int length)
{
int i = m_buffer_offset;
int j = 0;
long sum;
while (length-- > 0)
{
sum = 0;
for (int c = 0; c < m_num_channels; c++)
{
sum += input[offset++];
}
m_buffer[i + j++] = (short)(sum / m_num_channels);
}
}