| /* |
| * GStreamer |
| * Copyright (C) 2015 Matthew Waters <matthew@centricular.com> |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public |
| * License along with this library; if not, write to the |
| * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <stdio.h> |
| |
| #include "gtkgstwidget.h" |
| #include <gst/video/video.h> |
| |
| /** |
| * SECTION:gtkgstwidget |
| * @short_description: a #GtkWidget that renders GStreamer video #GstBuffers |
| * @see_also: #GtkDrawingArea, #GstBuffer |
| * |
| * #GtkGstWidget is an #GtkWidget that renders GStreamer video buffers. |
| */ |
| |
| G_DEFINE_TYPE (GtkGstWidget, gtk_gst_widget, GTK_TYPE_DRAWING_AREA); |
| |
| static gboolean |
| gtk_gst_widget_draw (GtkWidget * widget, cairo_t * cr) |
| { |
| GtkGstBaseWidget *gst_widget = (GtkGstBaseWidget *) widget; |
| guint widget_width, widget_height; |
| cairo_surface_t *surface; |
| GstVideoFrame frame; |
| |
| widget_width = gtk_widget_get_allocated_width (widget); |
| widget_height = gtk_widget_get_allocated_height (widget); |
| |
| GTK_GST_BASE_WIDGET_LOCK (gst_widget); |
| |
| /* There is not much to optimize in term of redisplay, so simply swap the |
| * pending_buffer with the active buffer */ |
| if (gst_widget->pending_buffer) { |
| if (gst_widget->buffer) |
| gst_buffer_unref (gst_widget->buffer); |
| gst_widget->buffer = gst_widget->pending_buffer; |
| gst_widget->pending_buffer = NULL; |
| } |
| |
| /* failed to map the video frame */ |
| if (gst_widget->negotiated && gst_widget->buffer |
| && gst_video_frame_map (&frame, &gst_widget->v_info, |
| gst_widget->buffer, GST_MAP_READ)) { |
| gdouble scale_x = (gdouble) widget_width / gst_widget->display_width; |
| gdouble scale_y = (gdouble) widget_height / gst_widget->display_height; |
| GstVideoRectangle result; |
| cairo_format_t format; |
| |
| gst_widget->v_info = frame.info; |
| if (frame.info.finfo->format == GST_VIDEO_FORMAT_ARGB || |
| frame.info.finfo->format == GST_VIDEO_FORMAT_BGRA) { |
| format = CAIRO_FORMAT_ARGB32; |
| } else { |
| format = CAIRO_FORMAT_RGB24; |
| } |
| |
| surface = cairo_image_surface_create_for_data (frame.data[0], |
| format, frame.info.width, frame.info.height, frame.info.stride[0]); |
| |
| if (gst_widget->force_aspect_ratio) { |
| GstVideoRectangle src, dst; |
| |
| src.x = 0; |
| src.y = 0; |
| src.w = gst_widget->display_width; |
| src.h = gst_widget->display_height; |
| |
| dst.x = 0; |
| dst.y = 0; |
| dst.w = widget_width; |
| dst.h = widget_height; |
| |
| gst_video_sink_center_rect (src, dst, &result, TRUE); |
| |
| scale_x = scale_y = MIN (scale_x, scale_y); |
| } else { |
| result.x = 0; |
| result.y = 0; |
| result.w = widget_width; |
| result.h = widget_height; |
| } |
| |
| if (gst_widget->ignore_alpha) { |
| GdkRGBA color = { 0.0, 0.0, 0.0, 1.0 }; |
| |
| gdk_cairo_set_source_rgba (cr, &color); |
| if (result.x > 0) { |
| cairo_rectangle (cr, 0, 0, result.x, widget_height); |
| cairo_fill (cr); |
| } |
| if (result.y > 0) { |
| cairo_rectangle (cr, 0, 0, widget_width, result.y); |
| cairo_fill (cr); |
| } |
| if (result.w < widget_width) { |
| cairo_rectangle (cr, result.x + result.w, 0, widget_width - result.w, |
| widget_height); |
| cairo_fill (cr); |
| } |
| if (result.h < widget_height) { |
| cairo_rectangle (cr, 0, result.y + result.h, widget_width, |
| widget_height - result.h); |
| cairo_fill (cr); |
| } |
| } |
| |
| scale_x *= (gdouble) gst_widget->display_width / (gdouble) frame.info.width; |
| scale_y *= |
| (gdouble) gst_widget->display_height / (gdouble) frame.info.height; |
| |
| cairo_translate (cr, result.x, result.y); |
| cairo_scale (cr, scale_x, scale_y); |
| cairo_rectangle (cr, 0, 0, result.w, result.h); |
| cairo_set_source_surface (cr, surface, 0, 0); |
| cairo_paint (cr); |
| |
| cairo_surface_destroy (surface); |
| |
| gst_video_frame_unmap (&frame); |
| } else { |
| GdkRGBA color; |
| |
| if (gst_widget->ignore_alpha) { |
| color.red = color.blue = color.green = 0.0; |
| color.alpha = 1.0; |
| } else { |
| gtk_style_context_get_color (gtk_widget_get_style_context (widget), |
| GTK_STATE_FLAG_NORMAL, &color); |
| } |
| gdk_cairo_set_source_rgba (cr, &color); |
| cairo_rectangle (cr, 0, 0, widget_width, widget_height); |
| cairo_fill (cr); |
| } |
| |
| GTK_GST_BASE_WIDGET_UNLOCK (gst_widget); |
| return FALSE; |
| } |
| |
| static void |
| gtk_gst_widget_finalize (GObject * object) |
| { |
| gtk_gst_base_widget_finalize (object); |
| |
| G_OBJECT_CLASS (gtk_gst_widget_parent_class)->finalize (object); |
| } |
| |
| static void |
| gtk_gst_widget_class_init (GtkGstWidgetClass * klass) |
| { |
| GObjectClass *gobject_klass = (GObjectClass *) klass; |
| GtkWidgetClass *widget_klass = (GtkWidgetClass *) klass; |
| |
| gtk_gst_base_widget_class_init (GTK_GST_BASE_WIDGET_CLASS (klass)); |
| gobject_klass->finalize = gtk_gst_widget_finalize; |
| widget_klass->draw = gtk_gst_widget_draw; |
| } |
| |
| static void |
| gtk_gst_widget_init (GtkGstWidget * widget) |
| { |
| gtk_gst_base_widget_init (GTK_GST_BASE_WIDGET (widget)); |
| } |
| |
| GtkWidget * |
| gtk_gst_widget_new (void) |
| { |
| return (GtkWidget *) g_object_new (GTK_TYPE_GST_WIDGET, NULL); |
| } |