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fix for LevelCost + little speed-up

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the p0 proba was incorrectly accumulated. Merging its contribution into
the LevelCost[] was creating more problems than anything (esp. with trellis)
so let's just not.

Change-Id: I4c07bfee471085df901228d97b20a4d9606ba44e
This commit is contained in:
Pascal Massimino 2012-01-23 09:17:35 -08:00
parent 7107d54483
commit 7f23678da0
2 changed files with 6 additions and 3 deletions
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2
src/enc/cost.c
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@ -359,7 +359,7 @@ void VP8CalculateLevelCosts(VP8Proba* const proba) {
for(ctx = 0; ctx < NUM_CTX; ++ctx) {
const uint8_t* const p = proba->coeffs_[ctype][band][ctx];
uint16_t* const table = proba->level_cost_[ctype][band][ctx];
const int cost_base = VP8BitCost(0, p[0]) + VP8BitCost(1, p[1]);
const int cost_base = VP8BitCost(1, p[1]);
int v;
table[0] = VP8BitCost(0, p[1]);
for (v = 1; v <= MAX_VARIABLE_LEVEL; ++v) {

7
src/enc/frame.c
View File

@ -274,12 +274,15 @@ static int GetResidualCost(int ctx, const VP8Residual* const res) {
const int b = VP8EncBands[n + 1];
++n;
if (v == 0) {
cost += VP8LevelCost(t, 0);
// short-case for VP8LevelCost(t, 0) (note: VP8LevelFixedCosts[0] == 0):
cost += t[0];
t = res->cost[b][0];
continue;
}
cost += VP8BitCost(1, p0);
if (2u >= (unsigned int)(v + 1)) { // v = -1 or 1
cost += VP8LevelCost(t, 1);
// short-case for "VP8LevelCost(t, 1)" (256 is VP8LevelFixedCosts[1]):
cost += 256 + t[1];
p0 = res->prob[b][1][0];
t = res->cost[b][1];
} else {