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Commit 741e1f99 authored by Fiona Glaser's avatar Fiona Glaser
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Measure CBP cost in i8x8 RD refinement 

~0.02-0.05db PSNR gain at high quants in intra-only encoding, pretty small otherwise.
Allows a small optimization in i8x8 encoding.
parent 3c5f281e
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Showing with 61 additions and 57 deletions
encoder/analyse.c
View file @ 741e1f99
......@@ -95,6 +95,7 @@ typedef struct
int i_predict16x16;
int i_satd_i8x8;
int i_cbp_i8x8_luma;
int i_satd_i8x8_dir[12][4];
int i_predict8x8[4];
......@@ -863,6 +864,7 @@ static void x264_intra_rd( x264_t *h, x264_mb_analysis_t *a, int i_satd_thresh )
h->mb.i_type = I_8x8;
x264_analyse_update_cache( h, a );
a->i_satd_i8x8 = x264_rd_cost_mb( h, a->i_lambda2 );
a->i_cbp_i8x8_luma = h->mb.i_cbp_luma;
}
else
a->i_satd_i8x8 = COST_MAX;
......@@ -896,7 +898,51 @@ static void x264_intra_rd_refine( x264_t *h, x264_mb_analysis_t *a )
COPY2_IF_LT( i_best, i_satd, a->i_predict16x16, i_mode );
}
}
else if( h->mb.i_type == I_4x4 )
/* RD selection for chroma prediction */
predict_8x8chroma_mode_available( h->mb.i_neighbour, predict_mode, &i_max );
if( i_max > 1 )
{
i_thresh = a->i_satd_i8x8chroma * 5/4;
for( i = j = 0; i < i_max; i++ )
if( a->i_satd_i8x8chroma_dir[i] < i_thresh &&
predict_mode[i] != a->i_predict8x8chroma )
{
predict_mode[j++] = predict_mode[i];
}
i_max = j;
if( i_max > 0 )
{
int i_cbp_chroma_best = h->mb.i_cbp_chroma;
int i_chroma_lambda = x264_lambda2_tab[h->mb.i_chroma_qp];
/* the previous thing encoded was x264_intra_rd(), so the pixels and
* coefs for the current chroma mode are still around, so we only
* have to recount the bits. */
i_best = x264_rd_cost_i8x8_chroma( h, i_chroma_lambda, a->i_predict8x8chroma, 0 );
for( i = 0; i < i_max; i++ )
{
i_mode = predict_mode[i];
if( h->mb.b_lossless )
x264_predict_lossless_8x8_chroma( h, i_mode );
else
{
h->predict_8x8c[i_mode]( h->mb.pic.p_fdec[1] );
h->predict_8x8c[i_mode]( h->mb.pic.p_fdec[2] );
}
/* if we've already found a mode that needs no residual, then
* probably any mode with a residual will be worse.
* so avoid dct on the remaining modes to improve speed. */
i_satd = x264_rd_cost_i8x8_chroma( h, i_chroma_lambda, i_mode, h->mb.i_cbp_chroma != 0x00 );
COPY3_IF_LT( i_best, i_satd, a->i_predict8x8chroma, i_mode, i_cbp_chroma_best, h->mb.i_cbp_chroma );
}
h->mb.i_chroma_pred_mode = a->i_predict8x8chroma;
h->mb.i_cbp_chroma = i_cbp_chroma_best;
}
}
if( h->mb.i_type == I_4x4 )
{
uint32_t pels[4] = {0}; // doesn't need initting, just shuts up a gcc warning
int i_nnz = 0;
......@@ -950,10 +996,11 @@ static void x264_intra_rd_refine( x264_t *h, x264_mb_analysis_t *a )
{
uint64_t pels_h = 0;
uint8_t pels_v[7];
int i_nnz[3];
uint16_t i_nnz[2];
uint8_t *p_src_by;
uint8_t *p_dst_by;
int j;
int cbp_luma_new = 0;
i_thresh = a->i_satd_i8x8_dir[a->i_predict8x8[idx]][idx] * 11/8;
i_best = COST_MAX64;
......@@ -975,73 +1022,34 @@ static void x264_intra_rd_refine( x264_t *h, x264_mb_analysis_t *a )
x264_predict_lossless_8x8( h, p_dst_by, idx, i_mode, edge );
else
h->predict_8x8[i_mode]( p_dst_by, edge );
h->mb.i_cbp_luma = a->i_cbp_i8x8_luma;
i_satd = x264_rd_cost_i8x8( h, a->i_lambda2, idx, i_mode );
if( i_best > i_satd )
{
a->i_predict8x8[idx] = i_mode;
cbp_luma_new = h->mb.i_cbp_luma;
i_best = i_satd;
pels_h = *(uint64_t*)(p_dst_by+7*FDEC_STRIDE);
if( !(idx&1) )
for( j=0; j<7; j++ )
pels_v[j] = p_dst_by[7+j*FDEC_STRIDE];
for( j=0; j<3; j++ )
i_nnz[j] = h->mb.cache.non_zero_count[x264_scan8[4*idx+j+1]];
i_nnz[0] = *(uint16_t*)&h->mb.cache.non_zero_count[x264_scan8[4*idx+0]];
i_nnz[1] = *(uint16_t*)&h->mb.cache.non_zero_count[x264_scan8[4*idx+2]];
}
}
a->i_cbp_i8x8_luma = cbp_luma_new;
*(uint64_t*)(p_dst_by+7*FDEC_STRIDE) = pels_h;
if( !(idx&1) )
for( j=0; j<7; j++ )
p_dst_by[7+j*FDEC_STRIDE] = pels_v[j];
for( j=0; j<3; j++ )
h->mb.cache.non_zero_count[x264_scan8[4*idx+j+1]] = i_nnz[j];
*(uint16_t*)&h->mb.cache.non_zero_count[x264_scan8[4*idx+0]] = i_nnz[0];
*(uint16_t*)&h->mb.cache.non_zero_count[x264_scan8[4*idx+2]] = i_nnz[1];
x264_macroblock_cache_intra8x8_pred( h, 2*x, 2*y, a->i_predict8x8[idx] );
}
}
/* RD selection for chroma prediction */
predict_8x8chroma_mode_available( h->mb.i_neighbour, predict_mode, &i_max );
if( i_max > 1 )
{
i_thresh = a->i_satd_i8x8chroma * 5/4;
for( i = j = 0; i < i_max; i++ )
if( a->i_satd_i8x8chroma_dir[i] < i_thresh &&
predict_mode[i] != a->i_predict8x8chroma )
{
predict_mode[j++] = predict_mode[i];
}
i_max = j;
if( i_max > 0 )
{
int i_chroma_lambda = x264_lambda2_tab[h->mb.i_chroma_qp];
/* the previous thing encoded was x264_intra_rd(), so the pixels and
* coefs for the current chroma mode are still around, so we only
* have to recount the bits. */
i_best = x264_rd_cost_i8x8_chroma( h, i_chroma_lambda, a->i_predict8x8chroma, 0 );
for( i = 0; i < i_max; i++ )
{
i_mode = predict_mode[i];
if( h->mb.b_lossless )
x264_predict_lossless_8x8_chroma( h, i_mode );
else
{
h->predict_8x8c[i_mode]( h->mb.pic.p_fdec[1] );
h->predict_8x8c[i_mode]( h->mb.pic.p_fdec[2] );
}
/* if we've already found a mode that needs no residual, then
* probably any mode with a residual will be worse.
* so avoid dct on the remaining modes to improve speed. */
i_satd = x264_rd_cost_i8x8_chroma( h, i_chroma_lambda, i_mode, h->mb.i_cbp_chroma != 0x00 );
COPY2_IF_LT( i_best, i_satd, a->i_predict8x8chroma, i_mode );
}
h->mb.i_chroma_pred_mode = a->i_predict8x8chroma;
}
}
}
#define LOAD_FENC( m, src, xoff, yoff) \
......
encoder/cabac.c
View file @ 741e1f99
......@@ -1144,6 +1144,7 @@ static void x264_partition_i8x8_size_cabac( x264_t *h, x264_cabac_t *cb, int i8,
const int i_pred = x264_mb_predict_intra4x4_mode( h, 4*i8 );
i_mode = x264_mb_pred_mode4x4_fix( i_mode );
x264_cabac_mb_intra4x4_pred_mode( cb, i_pred, i_mode );
x264_cabac_mb_cbp_luma( h, cb );
if( h->mb.i_cbp_luma & (1 << i8) )
block_residual_write_cabac_8x8( h, cb, 4*i8, h->dct.luma8x8[i8] );
}
......
encoder/cavlc.c
View file @ 741e1f99
......@@ -688,14 +688,9 @@ static int cavlc_intra4x4_pred_size( x264_t *h, int i4, int i_mode )
static int x264_partition_i8x8_size_cavlc( x264_t *h, int i8, int i_mode )
{
int i4;
h->out.bs.i_bits_encoded = cavlc_intra4x4_pred_size( h, 4*i8, i_mode );
h->zigzagf.interleave_8x8_cavlc( h->dct.luma4x4[i8*4], h->dct.luma8x8[i8] );
for( i4 = 0; i4 < 4; i4++ )
{
h->mb.cache.non_zero_count[x264_scan8[i4+i8*4]] = array_non_zero( h->dct.luma4x4[i4+i8*4] );
block_residual_write_cavlc( h, &h->out.bs, DCT_LUMA_4x4, i4+i8*4, h->dct.luma4x4[i4+i8*4], 16 );
}
bs_write_ue( &h->out.bs, intra4x4_cbp_to_golomb[( h->mb.i_cbp_chroma << 4 )|h->mb.i_cbp_luma] );
x264_macroblock_luma_write_cavlc( h, &h->out.bs, i8, i8 );
return h->out.bs.i_bits_encoded;
}
......
encoder/macroblock.c
View file @ 741e1f99
......@@ -169,10 +169,10 @@ void x264_mb_encode_i8x8( x264_t *h, int idx, int i_qp )
h->dctf.sub8x8_dct8( dct8x8, p_src, p_dst );
nz = x264_quant_8x8( h, dct8x8, i_qp, 1, idx );
h->zigzagf.scan_8x8( h->dct.luma8x8[idx], dct8x8 );
if( nz )
{
h->mb.i_cbp_luma |= 1<<idx;
h->zigzagf.scan_8x8( h->dct.luma8x8[idx], dct8x8 );
h->quantf.dequant_8x8( dct8x8, h->dequant8_mf[CQM_8IY], i_qp );
h->dctf.add8x8_idct8( p_dst, dct8x8 );
STORE_8x8_NNZ(idx,1);
......
encoder/rdo.c
View file @ 741e1f99
......@@ -245,7 +245,7 @@ uint64_t x264_rd_cost_part( x264_t *h, int i_lambda2, int i4, int i_pixel )
static uint64_t x264_rd_cost_i8x8( x264_t *h, int i_lambda2, int i8, int i_mode )
{
uint64_t i_ssd, i_bits;
h->mb.i_cbp_luma = 0;
h->mb.i_cbp_luma &= ~(1<<i8);
h->mb.b_transform_8x8 = 1;
x264_mb_encode_i8x8( h, i8, h->mb.i_qp );
......
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