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Use 8x8 DCT transform for I8X8 prediction mode

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Apply 2D-DCT transform of dimension 8x8 to encode prediction
residuals of I8X8 mode.
Brought back block type 3 probability context model for 8x8 tokens,
which is used for the coefficients of Y blocks in I8x8 modes. The
coefficient costs estimate of I8X8 mode in rate-distortion is also
changed appropriately.
Performance results:
derf:   0.246
yt:     0.114
std-hd: 0.730
hd:     0.670

Change-Id: If1d970eeb4e1827c9f0d2c5b27d33089b347ea27
This commit is contained in:
Jingning Han
2012-08-01 10:18:25 -07:00
parent 171b4ae157
commit c7846ebc34
8 changed files with 294 additions and 6 deletions
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25
vp8/decoder/decodframe.c
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@@ -235,6 +235,13 @@ static void decode_macroblock(VP8D_COMP *pbi, MACROBLOCKD *xd,
xd->mode_info_context->mbmi.txfm_size = TX_8X8;
}
}
#if CONFIG_HTRANS8X8
if (xd->mode_info_context->mbmi.mode == I8X8_PRED) {
xd->mode_info_context->mbmi.txfm_size = TX_8X8;
}
#endif
tx_type = xd->mode_info_context->mbmi.txfm_size;
if (xd->mode_info_context->mbmi.mb_skip_coeff) {
@@ -356,11 +363,28 @@ static void decode_macroblock(VP8D_COMP *pbi, MACROBLOCKD *xd,
int i8x8mode;
BLOCKD *b;
#if CONFIG_HTRANS8X8
int idx = (ib & 0x02) ? (ib + 2) : ib;
short *q = xd->block[idx].qcoeff;
short *dq = xd->block[0].dequant;
unsigned char *pre = xd->block[ib].predictor;
unsigned char *dst = *(xd->block[ib].base_dst) + xd->block[ib].dst;
int stride = xd->dst.y_stride;
tx_type = TX_4X4;
xd->mode_info_context->mbmi.txfm_size = TX_4X4;
#endif
b = &xd->block[ib];
i8x8mode = b->bmi.as_mode.first;
RECON_INVOKE(RTCD_VTABLE(recon), intra8x8_predict)
(b, i8x8mode, b->predictor);
#if CONFIG_HTRANS8X8
vp8_dequant_idct_add_8x8_c(q, dq, pre, dst, 16, stride);
q += 64;
#else
for (j = 0; j < 4; j++) {
b = &xd->block[ib + iblock[j]];
if (xd->eobs[ib + iblock[j]] > 1) {
@@ -374,6 +398,7 @@ static void decode_macroblock(VP8D_COMP *pbi, MACROBLOCKD *xd,
((int *)b->qcoeff)[0] = 0;
}
}
#endif
b = &xd->block[16 + i];
RECON_INVOKE(RTCD_VTABLE(recon), intra_uv4x4_predict)