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Improved token decoder

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Tests showed over 2% improvement on various HD clips.

Change-Id: I94a30d209c92cbd5fef285122f9fc570688635fe
This commit is contained in:
Scott LaVarnway 2011-10-19 13:38:35 -04:00
parent 63a77cbed9
commit 5e54085703
1 changed files with 19 additions and 18 deletions

37
vp8/decoder/detokenize.c

@ -9,7 +9,6 @@
*/
#include "vp8/common/type_aliases.h"
#include "vp8/common/blockd.h"
#include "onyxd_int.h"
#include "vpx_mem/vpx_mem.h"
@ -205,33 +204,34 @@ int vp8_decode_mb_tokens(VP8D_COMP *dx, MACROBLOCKD *x)
VP8_BD_VALUE value;
const int *scan;
register unsigned int shift;
UINT32 split;
unsigned int split;
VP8_BD_VALUE bigsplit;
INT16 *qcoeff_ptr;
short *qcoeff_ptr;
const vp8_prob *coef_probs;
int type;
int stop;
INT16 val, bits_count;
INT16 c;
INT16 v;
int val, bits_count;
int c;
int v;
const vp8_prob *Prob;
int start_coeff;
type = 3;
i = 0;
stop = 16;
scan = vp8_default_zig_zag1d;
qcoeff_ptr = &x->qcoeff[0];
coef_probs = fc->coef_probs [3] [ 0 ] [0];
if (x->mode_info_context->mbmi.mode != B_PRED &&
x->mode_info_context->mbmi.mode != SPLITMV)
{
i = 24;
stop = 24;
type = 1;
qcoeff_ptr += 24*16;
eobtotal -= 16;
coef_probs = fc->coef_probs [1] [ 0 ] [0];
}
bufend = bc->user_buffer_end;
@ -240,23 +240,24 @@ int vp8_decode_mb_tokens(VP8D_COMP *dx, MACROBLOCKD *x)
count = bc->count;
range = bc->range;
coef_probs = fc->coef_probs [type] [ 0 ] [0];
start_coeff = 0;
BLOCK_LOOP:
a = A + vp8_block2above[i];
l = L + vp8_block2left[i];
c = (INT16)(!type);
c = start_coeff;
/*Dest = ((A)!=0) + ((B)!=0);*/
VP8_COMBINEENTROPYCONTEXTS(v, *a, *l);
Prob = coef_probs;
Prob += v * ENTROPY_NODES;
*a = *l = 0;
DO_WHILE:
Prob += coef_bands_x[c];
DECODE_AND_BRANCH_IF_ZERO(Prob[EOB_CONTEXT_NODE], BLOCK_FINISHED);
*a = *l = 1;
CHECK_0_:
DECODE_AND_LOOP_IF_ZERO(Prob[ZERO_CONTEXT_NODE], CHECK_0_);
@ -346,7 +347,7 @@ ONE_CONTEXT_NODE_0_:
qcoeff_ptr [ 15 ] = (INT16) v;
BLOCK_FINISHED:
*a = *l = ((eobs[i] = c) != !type); /* any nonzero data? */
eobs[i] = c;
eobtotal += c;
qcoeff_ptr += 16;
@ -357,18 +358,18 @@ BLOCK_FINISHED:
if (i == 25)
{
type = 0;
start_coeff = 1;
i = 0;
stop = 16;
coef_probs = fc->coef_probs [type] [ 0 ] [0];
coef_probs = fc->coef_probs [0] [ 0 ] [0];
qcoeff_ptr -= (24*16 + 16);
goto BLOCK_LOOP;
}
if (i == 16)
{
type = 2;
coef_probs = fc->coef_probs [type] [ 0 ] [0];
start_coeff = 0;
coef_probs = fc->coef_probs [2] [ 0 ] [0];
stop = 24;
goto BLOCK_LOOP;
}