Commit 2b695c6d authored by Fiona Glaser's avatar Fiona Glaser

Various minor CABAC optimizations

parent 60fb787e
......@@ -213,10 +213,10 @@ static void x264_cabac_mb_cbp_luma( x264_t *h, x264_cabac_t *cb )
int cbp = h->mb.i_cbp_luma;
int cbp_l = h->mb.cache.i_cbp_left;
int cbp_t = h->mb.cache.i_cbp_top;
x264_cabac_encode_decision( cb, 76 - ((cbp_l >> 1) & 1) - ((cbp_t >> 1) & 2), (h->mb.i_cbp_luma >> 0) & 1 );
x264_cabac_encode_decision( cb, 76 - ((cbp >> 0) & 1) - ((cbp_t >> 2) & 2), (h->mb.i_cbp_luma >> 1) & 1 );
x264_cabac_encode_decision( cb, 76 - ((cbp_l >> 3) & 1) - ((cbp << 1) & 2), (h->mb.i_cbp_luma >> 2) & 1 );
x264_cabac_encode_decision_noup( cb, 76 - ((cbp >> 2) & 1) - ((cbp >> 0) & 2), (h->mb.i_cbp_luma >> 3) & 1 );
x264_cabac_encode_decision ( cb, 76 - ((cbp_l >> 1) & 1) - ((cbp_t >> 1) & 2), (cbp >> 0) & 1 );
x264_cabac_encode_decision ( cb, 76 - ((cbp >> 0) & 1) - ((cbp_t >> 2) & 2), (cbp >> 1) & 1 );
x264_cabac_encode_decision ( cb, 76 - ((cbp_l >> 3) & 1) - ((cbp << 1) & 2), (cbp >> 2) & 1 );
x264_cabac_encode_decision_noup( cb, 76 - ((cbp >> 2) & 1) - ((cbp >> 0) & 2), (cbp >> 3) & 1 );
}
static void x264_cabac_mb_cbp_chroma( x264_t *h, x264_cabac_t *cb )
......@@ -242,7 +242,6 @@ static void x264_cabac_mb_cbp_chroma( x264_t *h, x264_cabac_t *cb )
static void x264_cabac_mb_qp_delta( x264_t *h, x264_cabac_t *cb )
{
int i_mbn_xy = h->mb.i_mb_prev_xy;
int i_dqp = h->mb.i_qp - h->mb.i_last_qp;
int ctx;
......@@ -255,9 +254,9 @@ static void x264_cabac_mb_qp_delta( x264_t *h, x264_cabac_t *cb )
i_dqp = 0;
}
/* No need to test for PCM / SKIP */
ctx = h->mb.i_last_dqp &&
( h->mb.type[i_mbn_xy] == I_16x16 || (h->mb.cbp[i_mbn_xy]&0x3f) );
/* Since, per the above, empty-CBP I16x16 blocks never have delta quants,
* we don't have to check for them. */
ctx = h->mb.i_last_dqp && h->mb.cbp[h->mb.i_mb_prev_xy];
if( i_dqp != 0 )
{
......@@ -265,11 +264,11 @@ static void x264_cabac_mb_qp_delta( x264_t *h, x264_cabac_t *cb )
/* dqp is interpreted modulo 52 */
if( val >= 51 && val != 52 )
val = 103 - val;
while( val-- )
do
{
x264_cabac_encode_decision( cb, 60 + ctx, 1 );
ctx = 2+(ctx>>1);
}
} while( --val );
}
x264_cabac_encode_decision_noup( cb, 60 + ctx, 0 );
}
......@@ -357,54 +356,54 @@ static inline void x264_cabac_mb_mvd_cpn( x264_t *h, x264_cabac_t *cb, int i_lis
#if RDO_SKIP_BS
if( i_abs == 0 )
x264_cabac_encode_decision( cb, ctxbase + ctx, 0 );
else if( i_abs < 9 )
else
{
x264_cabac_encode_decision( cb, ctxbase + ctx, 1 );
if( i_abs > 4 )
{
x264_cabac_encode_decision( cb, ctxbase + 3, 1 );
x264_cabac_encode_decision( cb, ctxbase + 4, 1 );
x264_cabac_encode_decision( cb, ctxbase + 5, 1 );
cb->f8_bits_encoded += cabac_size_unary[i_abs - 3][cb->state[ctxbase+6]];
cb->state[ctxbase+6] = cabac_transition_unary[i_abs - 3][cb->state[ctxbase+6]];
}
else
if( i_abs <= 3 )
{
for( i = 1; i < i_abs; i++ )
x264_cabac_encode_decision( cb, ctxbase + i + 2, 1 );
x264_cabac_encode_decision( cb, ctxbase + i_abs + 2, 0 );
x264_cabac_encode_bypass( cb, mvd < 0 );
}
}
else
{
x264_cabac_encode_decision( cb, ctxbase + ctx, 1 );
x264_cabac_encode_decision( cb, ctxbase + 3, 1 );
x264_cabac_encode_decision( cb, ctxbase + 4, 1 );
x264_cabac_encode_decision( cb, ctxbase + 5, 1 );
cb->f8_bits_encoded += cabac_size_5ones[cb->state[ctxbase+6]];
cb->state[ctxbase+6] = cabac_transition_5ones[cb->state[ctxbase+6]];
x264_cabac_encode_ue_bypass( cb, 3, i_abs - 9 );
else
{
x264_cabac_encode_decision( cb, ctxbase + 3, 1 );
x264_cabac_encode_decision( cb, ctxbase + 4, 1 );
x264_cabac_encode_decision( cb, ctxbase + 5, 1 );
if( i_abs < 9 )
{
cb->f8_bits_encoded += cabac_size_unary[i_abs - 3][cb->state[ctxbase+6]];
cb->state[ctxbase+6] = cabac_transition_unary[i_abs - 3][cb->state[ctxbase+6]];
}
else
{
cb->f8_bits_encoded += cabac_size_5ones[cb->state[ctxbase+6]];
cb->state[ctxbase+6] = cabac_transition_5ones[cb->state[ctxbase+6]];
x264_cabac_encode_ue_bypass( cb, 3, i_abs - 9 );
}
}
}
#else
static const uint8_t ctxes[8] = { 3,4,5,6,6,6,6,6 };
if( i_abs == 0 )
x264_cabac_encode_decision( cb, ctxbase + ctx, 0 );
else if( i_abs < 9 )
{
x264_cabac_encode_decision( cb, ctxbase + ctx, 1 );
for( i = 1; i < i_abs; i++ )
x264_cabac_encode_decision( cb, ctxbase + ctxes[i-1], 1 );
x264_cabac_encode_decision( cb, ctxbase + ctxes[i_abs-1], 0 );
x264_cabac_encode_bypass( cb, mvd < 0 );
}
else
{
x264_cabac_encode_decision( cb, ctxbase + ctx, 1 );
for( i = 1; i < 9; i++ )
x264_cabac_encode_decision( cb, ctxbase + ctxes[i-1], 1 );
x264_cabac_encode_ue_bypass( cb, 3, i_abs - 9 );
if( i_abs < 9 )
{
for( i = 1; i < i_abs; i++ )
x264_cabac_encode_decision( cb, ctxbase + ctxes[i-1], 1 );
x264_cabac_encode_decision( cb, ctxbase + ctxes[i_abs-1], 0 );
}
else
{
for( i = 1; i < 9; i++ )
x264_cabac_encode_decision( cb, ctxbase + ctxes[i-1], 1 );
x264_cabac_encode_ue_bypass( cb, 3, i_abs - 9 );
}
x264_cabac_encode_bypass( cb, mvd < 0 );
}
#endif
......
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