3 * Copyright (C) 2015 Matthew Waters <matthew@centricular.com>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
27 #include "gtkgstwidget.h"
28 #include <gst/video/video.h>
31 * SECTION:gtkgstwidget
32 * @short_description: a #GtkWidget that renders GStreamer video #GstBuffers
33 * @see_also: #GtkDrawingArea, #GstBuffer
35 * #GtkGstWidget is an #GtkWidget that renders GStreamer video buffers.
38 G_DEFINE_TYPE (GtkGstWidget, gtk_gst_widget, GTK_TYPE_DRAWING_AREA);
40 #define GTK_GST_WIDGET_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), \
41 GTK_TYPE_GST_WIDGET, GtkGstWidgetPrivate))
43 #define DEFAULT_FORCE_ASPECT_RATIO TRUE
44 #define DEFAULT_PAR_N 0
45 #define DEFAULT_PAR_D 1
50 PROP_FORCE_ASPECT_RATIO,
51 PROP_PIXEL_ASPECT_RATIO,
54 struct _GtkGstWidgetPrivate
59 gboolean force_aspect_ratio;
72 gtk_gst_widget_get_preferred_width (GtkWidget * widget, gint * min,
75 GtkGstWidget *gst_widget = (GtkGstWidget *) widget;
76 gint video_width = GST_VIDEO_INFO_WIDTH (&gst_widget->priv->v_info);
78 if (!gst_widget->priv->negotiated)
84 *natural = video_width;
88 gtk_gst_widget_get_preferred_height (GtkWidget * widget, gint * min,
91 GtkGstWidget *gst_widget = (GtkGstWidget *) widget;
92 gint video_height = GST_VIDEO_INFO_HEIGHT (&gst_widget->priv->v_info);
94 if (!gst_widget->priv->negotiated)
100 *natural = video_height;
104 gtk_gst_widget_draw (GtkWidget * widget, cairo_t * cr)
106 GtkGstWidget *gst_widget = (GtkGstWidget *) widget;
107 guint widget_width, widget_height;
108 cairo_surface_t *surface;
111 widget_width = gtk_widget_get_allocated_width (widget);
112 widget_height = gtk_widget_get_allocated_height (widget);
114 g_mutex_lock (&gst_widget->priv->lock);
116 /* failed to map the video frame */
117 if (gst_widget->priv->negotiated && gst_widget->priv->buffer
118 && gst_video_frame_map (&frame, &gst_widget->priv->v_info,
119 gst_widget->priv->buffer, GST_MAP_READ)) {
120 gdouble scale_x = (gdouble) widget_width / gst_widget->priv->display_width;
122 (gdouble) widget_height / gst_widget->priv->display_height;
123 GstVideoRectangle result;
125 gst_widget->priv->v_info = frame.info;
127 surface = cairo_image_surface_create_for_data (frame.data[0],
128 CAIRO_FORMAT_ARGB32, frame.info.width, frame.info.height,
129 frame.info.stride[0]);
131 if (gst_widget->priv->force_aspect_ratio) {
132 GstVideoRectangle src, dst;
136 src.w = gst_widget->priv->display_width;
137 src.h = gst_widget->priv->display_height;
141 dst.w = widget_width;
142 dst.h = widget_height;
144 gst_video_sink_center_rect (src, dst, &result, TRUE);
146 scale_x = scale_y = MIN (scale_x, scale_y);
150 result.w = widget_width;
151 result.h = widget_height;
155 (gdouble) gst_widget->priv->display_width / (gdouble) frame.info.width;
157 (gdouble) gst_widget->priv->display_height /
158 (gdouble) frame.info.height;
160 cairo_translate (cr, result.x, result.y);
161 cairo_scale (cr, scale_x, scale_y);
162 cairo_rectangle (cr, 0, 0, result.w, result.h);
163 cairo_set_source_surface (cr, surface, 0, 0);
166 cairo_surface_destroy (surface);
168 gst_video_frame_unmap (&frame);
172 gtk_style_context_get_color (gtk_widget_get_style_context (widget), 0,
174 gdk_cairo_set_source_rgba (cr, &color);
175 cairo_rectangle (cr, 0, 0, widget_width, widget_height);
179 g_mutex_unlock (&gst_widget->priv->lock);
184 gtk_gst_widget_finalize (GObject * object)
186 GtkGstWidget *widget = GTK_GST_WIDGET_CAST (object);
188 gst_buffer_replace (&widget->priv->buffer, NULL);
189 g_mutex_clear (&widget->priv->lock);
191 G_OBJECT_CLASS (gtk_gst_widget_parent_class)->finalize (object);
195 gtk_gst_widget_set_property (GObject * object, guint prop_id,
196 const GValue * value, GParamSpec * pspec)
198 GtkGstWidget *gtk_widget = GTK_GST_WIDGET (object);
201 case PROP_FORCE_ASPECT_RATIO:
202 gtk_widget->priv->force_aspect_ratio = g_value_get_boolean (value);
204 case PROP_PIXEL_ASPECT_RATIO:
205 gtk_widget->priv->par_n = gst_value_get_fraction_numerator (value);
206 gtk_widget->priv->par_d = gst_value_get_fraction_denominator (value);
209 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
215 gtk_gst_widget_get_property (GObject * object, guint prop_id, GValue * value,
218 GtkGstWidget *gtk_widget = GTK_GST_WIDGET (object);
221 case PROP_FORCE_ASPECT_RATIO:
222 g_value_set_boolean (value, gtk_widget->priv->force_aspect_ratio);
224 case PROP_PIXEL_ASPECT_RATIO:
225 gst_value_set_fraction (value, gtk_widget->priv->par_n,
226 gtk_widget->priv->par_d);
229 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
235 gtk_gst_widget_class_init (GtkGstWidgetClass * klass)
237 GObjectClass *gobject_klass = (GObjectClass *) klass;
238 GtkWidgetClass *widget_klass = (GtkWidgetClass *) klass;
240 g_type_class_add_private (klass, sizeof (GtkGstWidgetPrivate));
242 gobject_klass->set_property = gtk_gst_widget_set_property;
243 gobject_klass->get_property = gtk_gst_widget_get_property;
244 gobject_klass->finalize = gtk_gst_widget_finalize;
246 g_object_class_install_property (gobject_klass, PROP_FORCE_ASPECT_RATIO,
247 g_param_spec_boolean ("force-aspect-ratio",
248 "Force aspect ratio",
249 "When enabled, scaling will respect original aspect ratio",
250 DEFAULT_FORCE_ASPECT_RATIO,
251 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
253 g_object_class_install_property (gobject_klass, PROP_PIXEL_ASPECT_RATIO,
254 gst_param_spec_fraction ("pixel-aspect-ratio", "Pixel Aspect Ratio",
255 "The pixel aspect ratio of the device", DEFAULT_PAR_N, DEFAULT_PAR_D,
256 G_MAXINT, 1, 1, 1, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
258 widget_klass->draw = gtk_gst_widget_draw;
259 widget_klass->get_preferred_width = gtk_gst_widget_get_preferred_width;
260 widget_klass->get_preferred_height = gtk_gst_widget_get_preferred_height;
264 gtk_gst_widget_init (GtkGstWidget * widget)
266 widget->priv = GTK_GST_WIDGET_GET_PRIVATE (widget);
268 widget->priv->force_aspect_ratio = DEFAULT_FORCE_ASPECT_RATIO;
269 widget->priv->par_n = DEFAULT_PAR_N;
270 widget->priv->par_d = DEFAULT_PAR_D;
272 g_mutex_init (&widget->priv->lock);
276 gtk_gst_widget_new (void)
278 return (GtkWidget *) g_object_new (GTK_TYPE_GST_WIDGET, NULL);
282 _queue_draw (GtkGstWidget * widget)
284 gtk_widget_queue_draw (GTK_WIDGET (widget));
286 return G_SOURCE_REMOVE;
290 gtk_gst_widget_set_buffer (GtkGstWidget * widget, GstBuffer * buffer)
292 GMainContext *main_context = g_main_context_default ();
294 g_return_if_fail (GTK_IS_GST_WIDGET (widget));
295 g_return_if_fail (widget->priv->negotiated);
297 g_mutex_lock (&widget->priv->lock);
299 gst_buffer_replace (&widget->priv->buffer, buffer);
301 g_mutex_unlock (&widget->priv->lock);
303 g_main_context_invoke (main_context, (GSourceFunc) _queue_draw, widget);
307 _queue_resize (GtkGstWidget * widget)
309 gtk_widget_queue_resize (GTK_WIDGET (widget));
311 return G_SOURCE_REMOVE;
315 _calculate_par (GtkGstWidget * widget, GstVideoInfo * info)
320 gint display_par_n, display_par_d;
321 guint display_ratio_num, display_ratio_den;
323 width = GST_VIDEO_INFO_WIDTH (info);
324 height = GST_VIDEO_INFO_HEIGHT (info);
326 par_n = GST_VIDEO_INFO_PAR_N (info);
327 par_d = GST_VIDEO_INFO_PAR_D (info);
332 /* get display's PAR */
333 if (widget->priv->par_n != 0 && widget->priv->par_d != 0) {
334 display_par_n = widget->priv->par_n;
335 display_par_d = widget->priv->par_d;
341 ok = gst_video_calculate_display_ratio (&display_ratio_num,
342 &display_ratio_den, width, height, par_n, par_d, display_par_n,
348 GST_LOG ("PAR: %u/%u DAR:%u/%u", par_n, par_d, display_par_n, display_par_d);
350 if (height % display_ratio_den == 0) {
351 GST_DEBUG ("keeping video height");
352 widget->priv->display_width = (guint)
353 gst_util_uint64_scale_int (height, display_ratio_num,
355 widget->priv->display_height = height;
356 } else if (width % display_ratio_num == 0) {
357 GST_DEBUG ("keeping video width");
358 widget->priv->display_width = width;
359 widget->priv->display_height = (guint)
360 gst_util_uint64_scale_int (width, display_ratio_den, display_ratio_num);
362 GST_DEBUG ("approximating while keeping video height");
363 widget->priv->display_width = (guint)
364 gst_util_uint64_scale_int (height, display_ratio_num,
366 widget->priv->display_height = height;
368 GST_DEBUG ("scaling to %dx%d", widget->priv->display_width,
369 widget->priv->display_height);
375 gtk_gst_widget_set_caps (GtkGstWidget * widget, GstCaps * caps)
377 GMainContext *main_context = g_main_context_default ();
380 g_return_val_if_fail (GTK_IS_GST_WIDGET (widget), FALSE);
381 g_return_val_if_fail (GST_IS_CAPS (caps), FALSE);
382 g_return_val_if_fail (gst_caps_is_fixed (caps), FALSE);
384 if (widget->priv->caps && gst_caps_is_equal_fixed (widget->priv->caps, caps))
387 if (!gst_video_info_from_caps (&v_info, caps))
390 /* FIXME: support other formats */
391 g_return_val_if_fail (GST_VIDEO_INFO_FORMAT (&v_info) ==
392 GST_VIDEO_FORMAT_BGRA, FALSE);
394 g_mutex_lock (&widget->priv->lock);
396 if (!_calculate_par (widget, &v_info)) {
397 g_mutex_unlock (&widget->priv->lock);
401 gst_caps_replace (&widget->priv->caps, caps);
402 widget->priv->v_info = v_info;
403 widget->priv->negotiated = TRUE;
405 g_mutex_unlock (&widget->priv->lock);
407 gtk_widget_queue_resize (GTK_WIDGET (widget));
409 g_main_context_invoke (main_context, (GSourceFunc) _queue_resize, widget);