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Rethink SAD-calculation.

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This commit is contained in:
Ari Koivula 2013-10-10 18:42:30 +03:00
parent 1fcb452479
commit 0e078b2d18
1 changed files with 34 additions and 51 deletions
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85
src/search.c
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@ -36,8 +36,8 @@
&& (x) + (block_width) <= (width) \
&& (y) + (block_height) <= (height))
unsigned corner_sad(unsigned char* pic_data, unsigned char* ref_data,
unsigned block_width, unsigned block_height, unsigned width)
unsigned cor_sad(unsigned char* pic_data, unsigned char* ref_data,
unsigned block_width, unsigned block_height, unsigned width)
{
unsigned char ref = *ref_data;
unsigned x, y;
@ -52,8 +52,8 @@ unsigned corner_sad(unsigned char* pic_data, unsigned char* ref_data,
return sad;
}
unsigned vertical_sad(unsigned char* pic_data, unsigned char* ref_data,
unsigned block_width, unsigned block_height, unsigned width)
unsigned ver_sad(unsigned char* pic_data, unsigned char* ref_data,
unsigned block_width, unsigned block_height, unsigned width)
{
unsigned x, y;
unsigned sad = 0;
@ -67,8 +67,8 @@ unsigned vertical_sad(unsigned char* pic_data, unsigned char* ref_data,
return sad;
}
unsigned horizontal_sad(unsigned char* pic_data, unsigned char* ref_data,
unsigned block_width, unsigned block_height, unsigned width)
unsigned hor_sad(unsigned char* pic_data, unsigned char* ref_data,
unsigned block_width, unsigned block_height, unsigned width)
{
unsigned x, y;
unsigned sad = 0;
@ -103,72 +103,55 @@ unsigned get_block_sad(picture *pic, picture *ref,
int mv_y = ref_y - pic_y;
int width = pic->width;
int height = pic->height;
int left = ref_x < 0;
int right = ref_x + block_width > width;
int top = ref_y < 0;
int bottom = ref_y + block_height > height;
// These are the number of pixels by how far the movement vector points
// outside the frame. They are always >= 0. If all of them are 0, the
// movement vector doesn't point outside the frame.
int left = (ref_x < 0) ? -ref_x : 0;
int top = (ref_y < 0) ? -ref_y : 0;
int right = (ref_x + block_width > width) ? ref_x - width : 0;
int bottom = (ref_y + block_height > height) ? ref_y - height : 0;
unsigned result = 0;
// Center both picture buffer and reference buffer to the picture block, so
// that further references are relative to the block rather than the
// top-left corner of the picture.
// Center picture to the current block and reference to the point where
// movement vector is pointing to. That point might be outside the buffer,
// but that is ok because we project the movement vector to the buffer
// before dereferencing the pointer.
pic_data = &pic->y_data[pic_y * width + pic_x];
ref_data = &ref->y_data[pic_y * width + pic_x];
ref_data = &ref->y_data[ref_y * width + ref_x];
// 0 means invalid, for now.
//if (!IN_FRAME(ref_x, ref_y, width, height, block_width, block_height)) return 0;
// The handling of movement vectors that point outside the picture is done
// in the following way.
// - Correct the index of ref_data so that it points to the top-left
// of the area we want to compare against.
// - Correct the index of pic_data to point inside the current block, so
// that we compare the right part of the block to the ref_data.
// - Reduce block_width and block_height so that the the size of the area
// being compared is correct.
if (left && top) {
result += corner_sad(pic_data, ref_data,
-ref_x, -ref_y, width);
result += vertical_sad(&pic_data[-ref_x], ref_data,
block_width - -ref_x, -ref_y, width);
result += horizontal_sad(&pic_data[-ref_y * width], ref_data,
-ref_x, block_height - -ref_y, width);
result += sad(&pic_data[-ref_y * width + -ref_x], ref_data,
block_width - -ref_x, block_height - -ref_y, width);
} else if (top) {
} else if (top && right) {
} else if (top) {
} else if (bottom && left) {
} else if (bottom && right) {
} else if (left) {
} else if (right) {
} else if (bottom && left) {
} else if (bottom) {
} else if (bottom && right) {
} else {
result += sad(pic_data, &ref_data[mv_y * width + mv_x], block_width, block_height, width);
result += sad(pic_data, ref_data, block_width, block_height, width);
}
#if USE_CHROMA_IN_MV_SEARCH
// Halve everything because chroma is half the resolution.
width >>= 2;
pic_x >>= 2;
pic_y >>= 2;
ref_x >>= 2;
ref_y >>= 2;
block >>= 2;
pic_data = &pic->u_data[pic_y * width + pic_x];
ref_data = &ref->u_data[ref_y * width + ref_x];
result += sad(pic_data, ref_data, block_width, block_height, width);
pic_data = &pic->v_data[pic_y * width + pic_x];
ref_data = &ref->v_data[ref_y * width + ref_x];
result += sad(pic_data, ref_data, block_width, block_height, width);
#endif
return result;
}