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Re-distribute hierarchical vector match pattern

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This commit modifies the hierarchical vector match patter. It
avoids repeated SAD computation at same points. The function
vp9_vector_sad_sse2 is called 12 times per 64x64 block, instead
of 15 times as before. The effective coverage remains the same.

Change-Id: I91ad9d27d40db8963c907d02af84e10702136994
This commit is contained in:
Jingning Han
2015-02-23 12:55:50 -08:00
parent a28a8cb726
commit f87e315e1e
1 changed files with 19 additions and 6 deletions
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25
vp9/encoder/vp9_encodeframe.c
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@@ -528,10 +528,10 @@ static int vector_match(int16_t *ref, int16_t *src) {
}
center = offset;
for (d = -8; d <= 8; d += 4) {
for (d = -8; d <= 8; d += 16) {
int this_pos = offset + d;
// check limit
if (this_pos < 0 || this_pos > 64 || this_pos == 32)
if (this_pos < 0 || this_pos > 64)
continue;
this_sad = vp9_vector_sad(&ref[this_pos], src, 64);
if (this_sad < best_sad) {
@@ -541,10 +541,10 @@ static int vector_match(int16_t *ref, int16_t *src) {
}
offset = center;
for (d = -4; d <= 4; d += 2) {
for (d = -4; d <= 4; d += 8) {
int this_pos = offset + d;
// check limit
if (this_pos < 0 || this_pos > 64 || this_pos == 32)
if (this_pos < 0 || this_pos > 64)
continue;
this_sad = vp9_vector_sad(&ref[this_pos], src, 64);
if (this_sad < best_sad) {
@@ -554,10 +554,23 @@ static int vector_match(int16_t *ref, int16_t *src) {
}
offset = center;
for (d = -2; d <= 2; d += 1) {
for (d = -2; d <= 2; d += 4) {
int this_pos = offset + d;
// check limit
if (this_pos < 0 || this_pos > 64 || this_pos == 32)
if (this_pos < 0 || this_pos > 64)
continue;
this_sad = vp9_vector_sad(&ref[this_pos], src, 64);
if (this_sad < best_sad) {
best_sad = this_sad;
center = this_pos;
}
}
offset = center;
for (d = -1; d <= 1; d += 2) {
int this_pos = offset + d;
// check limit
if (this_pos < 0 || this_pos > 64)
continue;
this_sad = vp9_vector_sad(&ref[this_pos], src, 64);
if (this_sad < best_sad) {