/* * 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); }