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ivtc: implement new edge-directed upsampling

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This commit is contained in:
David Schleef 2013-07-31 11:54:06 -07:00
parent 933965984f
commit d5f1ddad85
1 changed files with 89 additions and 1 deletions
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90
gst/ivtc/gstivtc.c
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@ -351,6 +351,24 @@ reconstruct (GstIvtc * ivtc, GstVideoFrame * dest_frame, int i1, int i2)
}
static int
reconstruct_line (guint8 * line1, guint8 * line2, int i, int a, int b, int c,
int d)
{
int x;
x = line1[i - 3] * a;
x += line1[i - 2] * b;
x += line1[i - 1] * c;
x += line1[i - 0] * d;
x += line2[i + 0] * d;
x += line2[i + 1] * c;
x += line2[i + 2] * b;
x += line2[i + 3] * a;
return (x + 16) >> 5;
}
static void
reconstruct_single (GstIvtc * ivtc, GstVideoFrame * dest_frame, int i1)
{
@ -360,7 +378,77 @@ reconstruct_single (GstIvtc * ivtc, GstVideoFrame * dest_frame, int i1)
int width;
GstIvtcField *field = &ivtc->fields[i1];
for (k = 0; k < 3; k++) {
for (k = 0; k < 1; k++) {
height = GST_VIDEO_FRAME_COMP_HEIGHT (dest_frame, k);
width = GST_VIDEO_FRAME_COMP_WIDTH (dest_frame, k);
for (j = 0; j < height; j++) {
if ((j & 1) == field->parity) {
memcpy (GET_LINE (dest_frame, k, j),
GET_LINE (&field->frame, k, j), width);
} else {
if (j == 0 || j == height - 1) {
memcpy (GET_LINE (dest_frame, k, j),
GET_LINE (&field->frame, k, (j ^ 1)), width);
} else {
guint8 *dest = GET_LINE (dest_frame, k, j);
guint8 *line1 = GET_LINE (&field->frame, k, j - 1);
guint8 *line2 = GET_LINE (&field->frame, k, j + 1);
int i;
#define MARGIN 3
for (i = MARGIN; i < width - MARGIN; i++) {
int dx, dy;
dx = -line1[i - 1] - line2[i - 1] + line1[i + 1] + line2[i + 1];
dx *= 2;
dy = -line1[i - 1] - 2 * line1[i] - line1[i + 1]
+ line2[i - 1] + 2 * line2[i] + line2[i + 1];
if (dy < 0) {
dy = -dy;
dx = -dx;
}
if (dx == 0 && dy == 0) {
dest[i] = (line1[i] + line2[i] + 1) >> 1;
} else if (dx < 0) {
if (dx < -2 * dy) {
dest[i] = reconstruct_line (line1, line2, i, 0, 0, 0, 16);
} else if (dx < -dy) {
dest[i] = reconstruct_line (line1, line2, i, 0, 0, 8, 8);
} else if (2 * dx < -dy) {
dest[i] = reconstruct_line (line1, line2, i, 0, 4, 8, 4);
} else if (3 * dx < -dy) {
dest[i] = reconstruct_line (line1, line2, i, 1, 7, 7, 1);
} else {
dest[i] = reconstruct_line (line1, line2, i, 4, 8, 4, 0);
}
} else {
if (dx > 2 * dy) {
dest[i] = reconstruct_line (line2, line1, i, 0, 0, 0, 16);
} else if (dx > dy) {
dest[i] = reconstruct_line (line2, line1, i, 0, 0, 8, 8);
} else if (2 * dx > dy) {
dest[i] = reconstruct_line (line2, line1, i, 0, 4, 8, 4);
} else if (3 * dx > dy) {
dest[i] = reconstruct_line (line2, line1, i, 1, 7, 7, 1);
} else {
dest[i] = reconstruct_line (line2, line1, i, 4, 8, 4, 0);
}
}
}
for (i = 0; i < MARGIN; i++) {
dest[i] = (line1[i] + line2[i] + 1) >> 1;
}
for (i = width - MARGIN; i < width; i++) {
dest[i] = (line1[i] + line2[i] + 1) >> 1;
}
}
}
}
}
for (k = 1; k < 3; k++) {
height = GST_VIDEO_FRAME_COMP_HEIGHT (dest_frame, k);
width = GST_VIDEO_FRAME_COMP_WIDTH (dest_frame, k);
for (j = 0; j < height; j++) {