static void
gst_gl_composition_overlay_add_transformation (GstGLCompositionOverlay *
overlay, GstBuffer * video_buffer)
{
gint comp_x, comp_y;
guint comp_width, comp_height;
GstVideoMeta *meta;
guint width, height;
float rel_x, rel_y, rel_w, rel_h;
meta = gst_buffer_get_video_meta (video_buffer);
gst_video_overlay_rectangle_get_render_rectangle (overlay->rectangle,
&comp_x, &comp_y, &comp_width, &comp_height);
width = meta->width;
height = meta->height;
/* calculate relative position */
rel_x = (float) comp_x / (float) width;
rel_y = (float) comp_y / (float) height;
rel_w = (float) comp_width / (float) width;
rel_h = (float) comp_height / (float) height;
/* transform from [0,1] to [-1,1], invert y axis */
rel_x = rel_x * 2.0 - 1.0;
rel_y = (1.0 - rel_y) * 2.0 - 1.0;
rel_w = rel_w * 2.0;
rel_h = rel_h * 2.0;
/* initialize position array */
overlay->positions[0] = rel_x + rel_w;
overlay->positions[1] = rel_y;
overlay->positions[2] = 0.0;
overlay->positions[3] = 1.0;
overlay->positions[4] = rel_x;
overlay->positions[5] = rel_y;
overlay->positions[6] = 0.0;
overlay->positions[7] = 1.0;
overlay->positions[8] = rel_x;
overlay->positions[9] = rel_y - rel_h;
overlay->positions[10] = 0.0;
overlay->positions[11] = 1.0;
overlay->positions[12] = rel_x + rel_w;
overlay->positions[13] = rel_y - rel_h;
overlay->positions[14] = 0.0;
overlay->positions[15] = 1.0;
gst_gl_context_thread_add (overlay->context,
gst_gl_composition_overlay_free_vertex_buffer, overlay);
gst_gl_context_thread_add (overlay->context,
gst_gl_composition_overlay_init_vertex_buffer, overlay);
GST_DEBUG
("overlay position: (%d,%d) size: %dx%d video size: %dx%d",
comp_x, comp_y, comp_width, comp_height, meta->width, meta->height);
}
/**
* gst_vaapi_surface_set_subpictures_from_composition:
* @surface: a #GstVaapiSurface
* @compostion: a #GstVideoOverlayCompositon
* @propagate_context: a flag specifying whether to apply composition
* to the parent context, if any
*
* Helper to update the subpictures from #GstVideoOverlayCompositon. Sending
* a NULL composition will clear all the current subpictures. Note that this
* method will clear existing subpictures.
*
* Return value: %TRUE on success
*/
gboolean
gst_vaapi_surface_set_subpictures_from_composition(
GstVaapiSurface *surface,
GstVideoOverlayComposition *composition,
gboolean propagate_context
)
{
GstVaapiDisplay *display;
guint n, nb_rectangles;
g_return_val_if_fail(GST_VAAPI_IS_SURFACE(surface), FALSE);
if (propagate_context) {
GstVaapiContext * const context = surface->priv->parent_context;
if (context)
return gst_vaapi_context_apply_composition(context, composition);
}
display = GST_VAAPI_OBJECT_DISPLAY(surface);
if (!display)
return FALSE;
/* Clear current subpictures */
gst_vaapi_surface_destroy_subpictures(surface);
if (!composition)
return TRUE;
nb_rectangles = gst_video_overlay_composition_n_rectangles (composition);
/* Overlay all the rectangles cantained in the overlay composition */
for (n = 0; n < nb_rectangles; ++n) {
GstVideoOverlayRectangle *rect;
GstVaapiRectangle sub_rect;
GstVaapiSubpicture *subpicture;
rect = gst_video_overlay_composition_get_rectangle (composition, n);
subpicture = gst_vaapi_subpicture_new_from_overlay_rectangle (display,
rect);
gst_video_overlay_rectangle_get_render_rectangle (rect,
(gint *)&sub_rect.x, (gint *)&sub_rect.y,
&sub_rect.width, &sub_rect.height);
if (!gst_vaapi_surface_associate_subpicture (surface, subpicture,
NULL, &sub_rect)) {
GST_WARNING ("could not render overlay rectangle %p", rect);
g_object_unref (subpicture);
return FALSE;
}
g_object_unref (subpicture);
}
return TRUE;
}
