CABAC编码
template <class BinProbModel>
void TBinEncoder<BinProbModel>::encodeBin( unsigned bin, unsigned ctxId )
{
BinCounter::addCtx( ctxId );
BinProbModel& rcProbModel = m_Ctx[ctxId];
uint32_t LPS = rcProbModel.getLPS( m_Range );
DTRACE( g_trace_ctx, D_CABAC, "%d" " %d " "%d" " " "[%d:%d]" " " "%2d(MPS=%d)" " " " - " "%d" "\n", DTRACE_GET_COUNTER( g_trace_ctx, D_CABAC ), ctxId, m_Range, m_Range - LPS, LPS, ( unsigned int ) ( rcProbModel.state() ), bin == rcProbModel.mps(), bin );
m_Range -= LPS;
if( bin != rcProbModel.mps() )
{//如果传过来的symbol是LPS,range肯定会小于256,因此要进行归一化操作
int numBits = rcProbModel.getRenormBitsLPS( LPS );
m_bitsLeft -= numBits;//寄存器中剩余的供Low左移用的位数
m_Low += m_Range;//则低位要加上m_Range
m_Low = m_Low << numBits;//对low的左移是为了输出