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Segmentation Entropy and tweaks.

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Some correction for entropy impact of segment signaled (EOB and ref frame)

Other slight tweaks.

Derf VBR average gain now over 1% (best over 7%)
One YT test clip has gains of circa 30% (VBR)

There is still an issue with noisy clips where making the background static
and coded with 0,0 can have a negative effect, especially at low Q.
This is probably because of the loss of smoothing by fractional pixel filters.

Change-Id: I7a225613c98067b96f8fc7a7e36f95d465b2b834
This commit is contained in:
Paul Wilkins 2011-10-28 15:27:23 +01:00
parent afb52f65f2
commit 795c6dd2c9
4 changed files with 66 additions and 24 deletions
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30
vp8/encoder/bitstream.c
View File

@ -929,12 +929,19 @@ static void pack_inter_mode_mvs(VP8_COMP *const cpi)
if (pc->mb_no_coeff_skip)
{
prob_skip_false = cpi->skip_false_count * 256 / (cpi->skip_false_count + cpi->skip_true_count);
// Divide by 0 check. 0 case possible with segment features
if ( (cpi->skip_false_count + cpi->skip_true_count) )
{
prob_skip_false = cpi->skip_false_count * 256 /
(cpi->skip_false_count + cpi->skip_true_count);
if (prob_skip_false <= 1)
prob_skip_false = 1;
if (prob_skip_false <= 1)
prob_skip_false = 1;
if (prob_skip_false > 255)
if (prob_skip_false > 255)
prob_skip_false = 255;
}
else
prob_skip_false = 255;
cpi->prob_skip_false = prob_skip_false;
@ -1192,12 +1199,19 @@ static void write_kfmodes(VP8_COMP *cpi)
if (c->mb_no_coeff_skip)
{
prob_skip_false = cpi->skip_false_count * 256 / (cpi->skip_false_count + cpi->skip_true_count);
// Divide by 0 check. 0 case possible with segment features
if ( (cpi->skip_false_count + cpi->skip_true_count) )
{
prob_skip_false = cpi->skip_false_count * 256 /
(cpi->skip_false_count + cpi->skip_true_count);
if (prob_skip_false <= 1)
prob_skip_false = 1;
if (prob_skip_false <= 1)
prob_skip_false = 1;
if (prob_skip_false >= 255)
if (prob_skip_false > 255)
prob_skip_false = 255;
}
else
prob_skip_false = 255;
cpi->prob_skip_false = prob_skip_false;

17
vp8/encoder/encodeframe.c
View File

@ -716,7 +716,7 @@ void encode_mb_row(VP8_COMP *cpi,
#endif
// Count of last ref frame 0,0 useage
// Count of last ref frame 0,0 usage
if ((xd->mode_info_context->mbmi.mode == ZEROMV) && (xd->mode_info_context->mbmi.ref_frame == LAST_FRAME))
cpi->inter_zz_count ++;
@ -758,7 +758,7 @@ void encode_mb_row(VP8_COMP *cpi,
cpi->tplist[mb_row].stop = *tp;
// Increment pointer into gf useage flags structure.
// Increment pointer into gf usage flags structure.
x->gf_active_ptr++;
// Increment the activity mask pointers.
@ -1014,7 +1014,7 @@ void vp8_encode_frame(VP8_COMP *cpi)
&cpi->common.rtcd.subpix, bilinear16x16);
}
// Reset frame count of inter 0,0 motion vector useage.
// Reset frame count of inter 0,0 motion vector usage.
cpi->inter_zz_count = 0;
vpx_memset(segment_counts, 0, sizeof(segment_counts));
@ -1320,7 +1320,7 @@ void vp8_encode_frame(VP8_COMP *cpi)
}
#endif
// Adjust the projected reference frame useage probability numbers to reflect
// Adjust the projected reference frame usage probability numbers to reflect
// what we have just seen. This may be usefull when we make multiple itterations
// of the recode loop rather than continuing to use values from the previous frame.
if ((cm->frame_type != KEY_FRAME) && !cm->refresh_alt_ref_frame && !cm->refresh_golden_frame)
@ -1710,11 +1710,10 @@ int vp8cx_encode_inter_macroblock
vp8_update_zbin_extra(cpi, x);
}
#if 0
//#if CONFIG_SEGFEATURES
// Test code using segment 1 only.
// Dont increment count if ref frame coded at segment level
if ( (xd->mode_info_context->mbmi.segment_id != 1) )
#if CONFIG_SEGFEATURES
// Dont increment usage count if ref frame coded at segment level
if ( !segfeature_active( xd, xd->mode_info_context->mbmi.segment_id,
SEG_LVL_REF_FRAME ) )
cpi->count_mb_ref_frame_usage[xd->mode_info_context->mbmi.ref_frame]++;
#else
cpi->count_mb_ref_frame_usage[xd->mode_info_context->mbmi.ref_frame] ++;

21
vp8/encoder/onyx_if.c
View File

@ -480,6 +480,10 @@ static void init_seg_features(VP8_COMP *cpi)
VP8_COMMON *cm = &cpi->common;
MACROBLOCKD *xd = &cpi->mb.e_mbd;
int high_q = ( (cpi->oxcf.end_usage == USAGE_CONSTRAINED_QUALITY) &&
(cpi->cq_target_quality > 16 ) ) ||
(cpi->ni_av_qi > 32);
// For now at least dont enable seg features alongside cyclic refresh.
if ( cpi->cyclic_refresh_mode_enabled ||
(cpi->pass != 2) )
@ -557,14 +561,12 @@ static void init_seg_features(VP8_COMP *cpi)
enable_segfeature(xd, 1, SEG_LVL_ALT_Q);
enable_segfeature(xd, 1, SEG_LVL_ALT_LF);
if ( ( (cpi->oxcf.end_usage == USAGE_CONSTRAINED_QUALITY) &&
(cpi->cq_target_quality > 56 ) ) ||
(cpi->ni_av_qi > 64) )
if ( high_q )
{
xd->segment_feature_data[1]
[SEG_LVL_REF_FRAME] = LAST_FRAME;
[SEG_LVL_REF_FRAME] = ALTREF_FRAME;
xd->segment_feature_data[1][SEG_LVL_MODE] = ZEROMV;
xd->segment_feature_data[1][SEG_LVL_EOB] = 15;
xd->segment_feature_data[1][SEG_LVL_EOB] = 0;
enable_segfeature(xd, 1, SEG_LVL_REF_FRAME);
enable_segfeature(xd, 1, SEG_LVL_MODE);
@ -602,6 +604,15 @@ static void init_seg_features(VP8_COMP *cpi)
xd->segment_feature_data[1][SEG_LVL_REF_FRAME] = ALTREF_FRAME;
xd->segment_feature_data[1][SEG_LVL_MODE] = ZEROMV;
// Skip all MBs if high Q
if ( high_q )
{
enable_segfeature(xd, 0, SEG_LVL_EOB);
enable_segfeature(xd, 1, SEG_LVL_EOB);
xd->segment_feature_data[0][SEG_LVL_EOB] = 0;
xd->segment_feature_data[1][SEG_LVL_EOB] = 0;
}
// Enable data udpate
xd->update_mb_segmentation_data = 1;
}

22
vp8/encoder/tokenize.c
View File

@ -491,6 +491,24 @@ void vp8_tokenize_mb(VP8_COMP *cpi, MACROBLOCKD *x, TOKENEXTRA **t)
int has_y2_block;
int b;
#if CONFIG_SEGFEATURES
// If the MB is going to be skipped because of a segment level flag
// exclude this from the skip count stats used to calculate the
// transmitted skip probability;
int skip_inc;
int segment_id = x->mode_info_context->mbmi.segment_id;
if ( !segfeature_active( x, segment_id, SEG_LVL_EOB ) ||
(x->segment_feature_data[segment_id][SEG_LVL_EOB] != 0) )
{
skip_inc = 1;
}
else
skip_inc = 0;
#else
int skip_inc = 1;
#endif
has_y2_block = (x->mode_info_context->mbmi.mode != B_PRED
#if CONFIG_I8X8
&& x->mode_info_context->mbmi.mode != I8X8_PRED
@ -508,7 +526,7 @@ void vp8_tokenize_mb(VP8_COMP *cpi, MACROBLOCKD *x, TOKENEXTRA **t)
if (x->mode_info_context->mbmi.mb_skip_coeff)
{
cpi->skip_true_count++;
cpi->skip_true_count += skip_inc;
if (!cpi->common.mb_no_coeff_skip)
{
@ -527,7 +545,7 @@ void vp8_tokenize_mb(VP8_COMP *cpi, MACROBLOCKD *x, TOKENEXTRA **t)
return;
}
cpi->skip_false_count++;
cpi->skip_false_count += skip_inc;
plane_type = 3;
if(has_y2_block)