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camerabin: crop still image capture frame if necessary

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If incoming still image capture frame aspect ratio differs from aspect
ratio that application requested, then apply crop to the frame.
This commit is contained in:
Lasse Laukkanen 2009-03-09 18:00:45 +02:00 committed by Stefan Kost
parent 2d4469c984
commit 53e6e4b0d5
1 changed files with 56 additions and 6 deletions
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62
gst/camerabin/gstcamerabin.c
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@ -1313,18 +1313,36 @@ gst_camerabin_set_capsfilter_caps (GstCameraBin * camera, GstCaps * new_caps)
gst_camerabin_update_aspect_filter (camera, new_caps);
}
/*
* gst_camerabin_adapt_video_resolution:
* @camera: camerabin object
* @caps: caps describing the next incoming buffer format
*
* This function adjusts capsfilter and crop elements in order to modify
* the incoming buffer to the resolution that application requested.
*
*/
static void
gst_camerabin_adapt_video_resolution (GstCameraBin * camera, GstCaps * caps)
{
GstStructure *st;
gint width = 0, height = 0;
GstCaps *filter_caps = NULL;
gint top, bottom, left, right, crop;
gdouble ratio_w, ratio_h;
g_return_if_fail (camera->width != 0 && camera->height != 0);
/* Get width and height from caps */
st = gst_caps_get_structure (caps, 0);
gst_structure_get_int (st, "width", &width);
gst_structure_get_int (st, "height", &height);
if (width == camera->width && height == camera->height) {
GST_DEBUG_OBJECT (camera, "no adaptation with resolution needed");
return;
}
GST_DEBUG_OBJECT (camera,
"changing %dx%d -> %dx%d filter to %" GST_PTR_FORMAT,
camera->width, camera->height, width, height, camera->src_filter);
@ -1336,7 +1354,31 @@ gst_camerabin_adapt_video_resolution (GstCameraBin * camera, GstCaps * caps)
"height", G_TYPE_INT, height, NULL);
g_object_set (G_OBJECT (camera->src_filter), "caps", filter_caps, NULL);
gst_caps_unref (filter_caps);
/* FIXME: implement cropping according to requested aspect ratio */
/* Crop if requested aspect ratio differs from incoming frame aspect ratio */
/* Don't override original crop values in case we have zoom applied */
g_object_get (G_OBJECT (camera->src_zoom_crop), "top", &top, "bottom",
&bottom, "left", &left, "right", &right, NULL);
ratio_w = (gdouble) width / camera->width;
ratio_h = (gdouble) height / camera->height;
if (ratio_w < ratio_h) {
crop = height - (camera->height * ratio_w);
top += crop / 2;
bottom += crop / 2;
} else {
crop = width - (camera->width * ratio_h);
left += crop / 2;
right += crop / 2;
}
GST_INFO_OBJECT (camera,
"updating crop: left:%d, right:%d, top:%d, bottom:%d", left, right, top,
bottom);
g_object_set (G_OBJECT (camera->src_zoom_crop), "top", top, "bottom", bottom,
"left", left, "right", right, NULL);
}
/*
@ -1353,11 +1395,13 @@ img_capture_prepared (gpointer data, GstCaps * caps)
GstStructure *st, *new_st;
gint i;
const gchar *field_name;
gboolean adapt = FALSE;
GST_INFO_OBJECT (camera, "image capture prepared");
/* It is possible we are about to get something else that we requested */
if (!gst_caps_is_equal (camera->image_capture_caps, caps)) {
adapt = TRUE;
/* If capture preparation has added new fields to requested caps,
we need to copy them */
st = gst_caps_get_structure (camera->image_capture_caps, 0);
@ -1378,10 +1422,11 @@ img_capture_prepared (gpointer data, GstCaps * caps)
/* Update capsfilters */
gst_camerabin_set_capsfilter_caps (camera, camera->image_capture_caps);
/* If incoming buffer resolution is different from what application
requested, then we need to fix this in camerabin */
gst_camerabin_adapt_video_resolution (camera, caps);
if (adapt) {
/* If incoming buffer resolution is different from what application
requested, then we can fix this in camerabin */
gst_camerabin_adapt_video_resolution (camera, caps);
}
g_object_set (G_OBJECT (camera->src_out_sel), "resend-latest", FALSE,
"active-pad", camera->pad_src_img, NULL);
gst_camerabin_rewrite_tags (camera);
@ -2756,8 +2801,13 @@ gst_camerabin_handle_message_func (GstBin * bin, GstMessage * msg)
/* Image eos */
GST_DEBUG_OBJECT (camera, "got image eos message");
/* Still image capture buffer handled, restore filter caps */
/* HACK: v4l2camsrc changes to view finder resolution automatically
after one captured still image */
if (camera->image_capture_caps) {
GST_DEBUG_OBJECT (camera, "resetting crop in camerabin");
g_object_set (camera->src_zoom_crop, "left", 0, "right", 0,
"top", 0, "bottom", 0, NULL);
/* Still image capture buffer handled, restore filter caps */
gst_camerabin_set_capsfilter_caps (camera, camera->view_finder_caps);
}