/**
* gst_video_overlay_composition_new:
* @rectangle: (transfer none): a #GstVideoOverlayRectangle to add to the
* composition
*
* Creates a new video overlay composition object to hold one or more
* overlay rectangles.
*
* Returns: (transfer full): a new #GstVideoOverlayComposition. Unref with
* gst_video_overlay_composition_unref() when no longer needed.
*
* Since: 0.10.36
*/
GstVideoOverlayComposition *
gst_video_overlay_composition_new (GstVideoOverlayRectangle * rectangle)
{
GstVideoOverlayComposition *comp;
/* FIXME: should we allow empty compositions? Could also be expressed as
* buffer without a composition on it. Maybe there are cases where doing
* an empty new + _add() in a loop is easier? */
g_return_val_if_fail (GST_IS_VIDEO_OVERLAY_RECTANGLE (rectangle), NULL);
comp = (GstVideoOverlayComposition *)
gst_mini_object_new (GST_TYPE_VIDEO_OVERLAY_COMPOSITION);
comp->rectangles = g_new0 (GstVideoOverlayRectangle *, RECTANGLE_ARRAY_STEP);
comp->rectangles[0] = gst_video_overlay_rectangle_ref (rectangle);
comp->num_rectangles = 1;
comp->seq_num = gst_video_overlay_get_seqnum ();
/* since the rectangle was created earlier, its seqnum is smaller than ours */
comp->min_seq_num_used = rectangle->seq_num;
GST_LOG ("new composition %p: seq_num %u with rectangle %p", comp,
comp->seq_num, rectangle);
return comp;
}
/**
* gst_video_overlay_composition_add_rectangle:
* @comp: a #GstVideoOverlayComposition
* @rectangle: (transfer none): a #GstVideoOverlayRectangle to add to the
* composition
*
* Adds an overlay rectangle to an existing overlay composition object. This
* must be done right after creating the overlay composition.
*
* Since: 0.10.36
*/
void
gst_video_overlay_composition_add_rectangle (GstVideoOverlayComposition * comp,
GstVideoOverlayRectangle * rectangle)
{
g_return_if_fail (GST_IS_VIDEO_OVERLAY_COMPOSITION (comp));
g_return_if_fail (GST_IS_VIDEO_OVERLAY_RECTANGLE (rectangle));
g_return_if_fail (GST_MINI_OBJECT_REFCOUNT_VALUE (comp) == 1);
if (comp->num_rectangles % RECTANGLE_ARRAY_STEP == 0) {
comp->rectangles =
g_renew (GstVideoOverlayRectangle *, comp->rectangles,
comp->num_rectangles + RECTANGLE_ARRAY_STEP);
}
/**
* gst_vaapi_subpicture_new_from_overlay_rectangle:
* @display: a #GstVaapiDisplay
* @rect: a #GstVideoOverlayRectangle
*
* Helper function that creates a new #GstVaapiSubpicture from a
* #GstVideoOverlayRectangle. A new #GstVaapiImage is also created
* along the way and attached to the resulting subpicture. The
* subpicture holds a unique reference to the underlying image.
*
* Return value: the newly allocated #GstVaapiSubpicture object
*/
GstVaapiSubpicture *
gst_vaapi_subpicture_new_from_overlay_rectangle (GstVaapiDisplay * display,
GstVideoOverlayRectangle * rect)
{
GstVaapiSubpicture *subpicture;
GstVideoFormat format;
GstVaapiImage *image;
GstVaapiImageRaw raw_image;
GstBuffer *buffer;
guint8 *data;
gfloat global_alpha;
guint width, height, stride;
guint hw_flags, flags;
GstVideoMeta *vmeta;
GstMapInfo map_info;
g_return_val_if_fail (GST_IS_VIDEO_OVERLAY_RECTANGLE (rect), NULL);
/* XXX: use gst_vaapi_image_format_from_video() */
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
format = GST_VIDEO_FORMAT_BGRA;
#else
format = GST_VIDEO_FORMAT_ARGB;
#endif
if (!gst_vaapi_display_has_subpicture_format (display, format, &hw_flags))
return NULL;
flags =
hw_flags &
from_GstVideoOverlayFormatFlags (gst_video_overlay_rectangle_get_flags
(rect));
buffer = gst_video_overlay_rectangle_get_pixels_unscaled_argb (rect,
to_GstVideoOverlayFormatFlags (flags));
if (!buffer)
return NULL;
vmeta = gst_buffer_get_video_meta (buffer);
if (!vmeta)
return NULL;
width = vmeta->width;
height = vmeta->height;
if (!gst_video_meta_map (vmeta, 0, &map_info, (gpointer *) & data,
(gint *) & stride, GST_MAP_READ))
return NULL;
image = gst_vaapi_image_new (display, format, width, height);
if (!image)
return NULL;
raw_image.format = format;
raw_image.width = width;
raw_image.height = height;
raw_image.num_planes = 1;
raw_image.pixels[0] = data;
raw_image.stride[0] = stride;
if (!gst_vaapi_image_update_from_raw (image, &raw_image, NULL)) {
GST_WARNING ("could not update VA image with subtitle data");
gst_vaapi_object_unref (image);
return NULL;
}
subpicture = gst_vaapi_subpicture_new (image, flags);
gst_vaapi_object_unref (image);
gst_video_meta_unmap (vmeta, 0, &map_info);
if (!subpicture)
return NULL;
if (flags & GST_VAAPI_SUBPICTURE_FLAG_GLOBAL_ALPHA) {
global_alpha = gst_video_overlay_rectangle_get_global_alpha (rect);
if (!gst_vaapi_subpicture_set_global_alpha (subpicture, global_alpha))
return NULL;
}
return subpicture;
}
