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Turning model based reverse update on for coefs

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Turns model based reverse updates on for coefficients in an
effort to reduce the memory requirement for counters.

With this patch the counters needed will be reduced by about
75% since only 3 counts are needed instead of 12.

The impact in performance is:
derf300: -0.252%
stdhd250: -0.046%

However retraining should alleviate some of the drop in
performance.

Change-Id: I6f2b3e13f6d5520aa3400b0b228fb5e8b4a43caa
This commit is contained in:
Deb Mukherjee 2013-04-26 11:13:26 -07:00
parent fb3e4ed9eb
commit 040eeed9d0
2 changed files with 6 additions and 1 deletions
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2
vp9/common/vp9_entropy.c
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@ -1555,6 +1555,7 @@ static void adapt_coef_probs(vp9_coeff_probs *dst_coef_probs,
}
void vp9_adapt_coef_probs(VP9_COMMON *cm) {
#ifndef DISABLE_COEF_ADAPT
int count_sat;
int update_factor; /* denominator 256 */
@ -1585,6 +1586,7 @@ void vp9_adapt_coef_probs(VP9_COMMON *cm) {
cm->base_qindex, cm->fc.coef_counts_32x32,
cm->fc.eob_branch_counts[TX_32X32],
count_sat, update_factor);
#endif
}
#if CONFIG_CODE_ZEROGROUP

5
vp9/common/vp9_entropy.h
View File

@ -84,6 +84,9 @@ extern vp9_extra_bit vp9_extra_bits[12]; /* indexed by token value */
/*# define DC_TOKEN_CONTEXTS 3*/ /* 00, 0!0, !0!0 */
#define PREV_COEF_CONTEXTS 6
// Disables backward coef probs adaption
// #define DISABLE_COEF_ADAPT
typedef unsigned int vp9_coeff_count[REF_TYPES][COEF_BANDS][PREV_COEF_CONTEXTS]
[MAX_ENTROPY_TOKENS];
typedef unsigned int vp9_coeff_stats[REF_TYPES][COEF_BANDS][PREV_COEF_CONTEXTS]
@ -158,7 +161,7 @@ const int *vp9_get_coef_neighbors_handle(const int *scan, int *pad);
// if model-based how many nodes are unconstrained
#define UNCONSTRAINED_UPDATE_NODES 3
// whether backward updates are model-based
#define MODEL_BASED_ADAPT 0
#define MODEL_BASED_ADAPT 1
#define UNCONSTRAINED_ADAPT_NODES 3
typedef vp9_prob vp9_coeff_probs_model[REF_TYPES][COEF_BANDS]