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geometrictransform: Precalculate mapping array

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Precalculate when setting caps the warping map to avoid
recalculating it every buffer
This commit is contained in:
Thiago Santos 2010-05-26 21:39:21 -03:00
parent 1250a7406d
commit 6560248be9
2 changed files with 67 additions and 20 deletions
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83
gst/geometrictransform/gstgeometrictransform.c
View file

@ -43,30 +43,85 @@ static GstStaticPadTemplate gst_geometric_transform_sink_template =
static GstVideoFilterClass *parent_class = NULL;
static gboolean
gst_geometric_transform_generate_map (GstGeometricTransform * gt)
{
gint x, y;
gdouble in_x, in_y;
gboolean ret = TRUE;
GstGeometricTransformClass *klass;
gdouble *ptr;
/* cleanup old map */
g_free (gt->map);
gt->map = NULL;
klass = GST_GEOMETRIC_TRANSFORM_GET_CLASS (gt);
/* subclass must have defined the map_func */
g_return_val_if_fail (klass->map_func, FALSE);
/*
* (x,y) pairs of the inverse mapping
*/
gt->map = g_malloc0 (sizeof (gdouble) * gt->width * gt->height * 2);
ptr = gt->map;
for (y = 0; y < gt->height; y++) {
for (x = 0; x < gt->width; x++) {
if (!klass->map_func (gt, x, y, &in_x, &in_y)) {
/* child should have warned */
ret = FALSE;
goto end;
}
ptr[0] = in_x;
ptr[1] = in_y;
ptr += 2;
}
}
end:
if (!ret)
g_free (gt->map);
return ret;
}
static gboolean
gst_geometric_transform_set_caps (GstBaseTransform * btrans, GstCaps * incaps,
GstCaps * outcaps)
{
GstGeometricTransform *gt;
gboolean ret;
gint old_width;
gint old_height;
gt = GST_GEOMETRIC_TRANSFORM (btrans);
old_width = gt->width;
old_height = gt->height;
ret = gst_video_format_parse_caps (incaps, &gt->format, &gt->width,
&gt->height);
if (ret) {
gt->row_stride = gst_video_format_get_row_stride (gt->format, 0, gt->width);
gt->pixel_stride = gst_video_format_get_pixel_stride (gt->format, 0);
/* regenerate the map */
if (old_width == 0 || old_height == 0 || gt->width != old_width ||
gt->height != old_height) {
gst_geometric_transform_generate_map (gt);
}
}
return ret;
}
static void
gst_geometric_transform_do_map (GstGeometricTransform * gt, GstBuffer * inbuf,
GstBuffer * outbuf, gint x, gint y, gdouble out_x, gdouble out_y)
GstBuffer * outbuf, gint x, gint y, gdouble in_x, gdouble in_y)
{
gint trunc_x = (gint) out_x;
gint trunc_y = (gint) out_y;
gint trunc_x = (gint) in_x;
gint trunc_y = (gint) in_y;
gint in_offset;
gint out_offset;
@ -82,33 +137,23 @@ gst_geometric_transform_transform (GstBaseTransform * trans, GstBuffer * buf,
GstBuffer * outbuf)
{
GstGeometricTransform *gt;
GstGeometricTransformClass *klass;
gint x, y;
gdouble out_x, out_y;
guint8 *data;
GstFlowReturn ret = GST_FLOW_OK;
gdouble *ptr;
gt = GST_GEOMETRIC_TRANSFORM (trans);
klass = GST_GEOMETRIC_TRANSFORM_GET_CLASS (gt);
/* subclass must have defined the map_func */
g_return_val_if_fail (klass->map_func, GST_FLOW_ERROR);
g_return_val_if_fail (gt->map, GST_FLOW_ERROR);
data = GST_BUFFER_DATA (buf);
for (x = 0; x < gt->width; x++) {
ptr = gt->map;
for (y = 0; y < gt->height; y++) {
if (!klass->map_func (gt, x, y, &out_x, &out_y)) {
/* child should have warned */
ret = GST_FLOW_ERROR;
goto end;
}
for (x = 0; x < gt->width; x++) {
/* do the mapping */
gst_geometric_transform_do_map (gt, buf, outbuf, x, y, out_x, out_y);
gst_geometric_transform_do_map (gt, buf, outbuf, x, y, ptr[0], ptr[1]);
ptr += 2;
}
}
end:
return ret;
}

2
gst/geometrictransform/gstgeometrictransform.h
View file

@ -70,6 +70,8 @@ struct _GstGeometricTransform {
GstVideoFormat format;
gint pixel_stride;
gint row_stride;
gdouble *map;
};
struct _GstGeometricTransformClass {