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Skip inverse transform when eob is zero 

When all the transform coefficients were quantized to zero, skip
the inverse transform operation. For bus_cif at 1000 kbps, the
runtime goes from 154967ms -> 149842ms, i.e., about 3% speed-up,
at speed 0.

Change-Id: Ic0a813fff5e28972d4888ee42d8747846a6c3cc6
This commit is contained in:
Jingning Han 2013-07-23 10:02:43 -07:00
Родитель cedd24ec61
Коммит 0359ad7f9a
1 изменённых файлов: 6 добавлений и 4 удалений
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10
vp9/encoder/vp9_encodemb.c
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@ -533,6 +533,8 @@ static void encode_block(int plane, int block, BLOCK_SIZE_TYPE bsize,
if (x->skip_encode)
return;
if (pd->eobs[block] == 0)
return;
switch (ss_txfrm_size / 2) {
case TX_32X32:
@ -657,7 +659,7 @@ void encode_block_intra(int plane, int block, BLOCK_SIZE_TYPE bsize,
vp9_quantize_b_32x32(coeff, 1024, x->skip_block, p->zbin, p->round,
p->quant, p->quant_shift, qcoeff, dqcoeff,
pd->dequant, p->zbin_extra, eob, scan, iscan);
if (!x->skip_encode)
if (!x->skip_encode && *eob)
vp9_short_idct32x32_add(dqcoeff, dst, pd->dst.stride);
break;
case TX_16X16:
@ -682,7 +684,7 @@ void encode_block_intra(int plane, int block, BLOCK_SIZE_TYPE bsize,
vp9_quantize_b(coeff, 256, x->skip_block, p->zbin, p->round, p->quant,
p->quant_shift, qcoeff, dqcoeff,
pd->dequant, p->zbin_extra, eob, scan, iscan);
if (!x->skip_encode) {
if (!x->skip_encode && *eob) {
if (tx_type == DCT_DCT)
vp9_short_idct16x16_add(dqcoeff, dst, pd->dst.stride);
else
@ -711,7 +713,7 @@ void encode_block_intra(int plane, int block, BLOCK_SIZE_TYPE bsize,
vp9_quantize_b(coeff, 64, x->skip_block, p->zbin, p->round, p->quant,
p->quant_shift, qcoeff, dqcoeff,
pd->dequant, p->zbin_extra, eob, scan, iscan);
if (!x->skip_encode) {
if (!x->skip_encode && *eob) {
if (tx_type == DCT_DCT)
vp9_short_idct8x8_add(dqcoeff, dst, pd->dst.stride);
else
@ -743,7 +745,7 @@ void encode_block_intra(int plane, int block, BLOCK_SIZE_TYPE bsize,
vp9_quantize_b(coeff, 16, x->skip_block, p->zbin, p->round, p->quant,
p->quant_shift, qcoeff, dqcoeff,
pd->dequant, p->zbin_extra, eob, scan, iscan);
if (!x->skip_encode) {
if (!x->skip_encode && *eob) {
if (tx_type == DCT_DCT)
// this is like vp9_short_idct4x4 but has a special case around eob<=1
// which is significant (not just an optimization) for the lossless