/* GStreamer GdkPixbuf overlay * Copyright (C) 2012 Tim-Philipp Müller * * 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 Street, Suite 500, * Boston, MA 02110-1335, USA. */ /** * SECTION:element-gdkpixbufoverlay * @see_also: * * The gdkpixbufoverlay element overlays an image loaded from file onto * a video stream. * * Changing the positioning or overlay width and height properties at runtime * is supported, but it might be prudent to to protect the property setting * code with GST_BASE_TRANSFORM_LOCK and GST_BASE_TRANSFORM_UNLOCK, as * g_object_set() is not atomic for multiple properties passed in one go. * * Changing the image at runtime is currently not supported. * * Negative offsets are also not yet supported. * * * Example launch line * |[ * gst-launch -v videotestsrc ! gdkpixbufoverlay location=image.png ! autovideosink * ]| * Overlays the image in image.png onto the test video picture produced by * videotestsrc. * * * Since: 0.10.33 */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include "gstgdkpixbufoverlay.h" GST_DEBUG_CATEGORY_STATIC (gdkpixbufoverlay_debug); #define GST_CAT_DEFAULT gdkpixbufoverlay_debug static void gst_gdk_pixbuf_overlay_set_property (GObject * object, guint property_id, const GValue * value, GParamSpec * pspec); static void gst_gdk_pixbuf_overlay_get_property (GObject * object, guint property_id, GValue * value, GParamSpec * pspec); static void gst_gdk_pixbuf_overlay_finalize (GObject * object); static gboolean gst_gdk_pixbuf_overlay_start (GstBaseTransform * trans); static gboolean gst_gdk_pixbuf_overlay_stop (GstBaseTransform * trans); static GstFlowReturn gst_gdk_pixbuf_overlay_transform_ip (GstBaseTransform * trans, GstBuffer * buf); static void gst_gdk_pixbuf_overlay_before_transform (GstBaseTransform * trans, GstBuffer * outbuf); static gboolean gst_gdk_pixbuf_overlay_set_caps (GstBaseTransform * trans, GstCaps * incaps, GstCaps * outcaps); enum { PROP_0, PROP_LOCATION, PROP_OFFSET_X, PROP_OFFSET_Y, PROP_RELATIVE_X, PROP_RELATIVE_Y, PROP_OVERLAY_WIDTH, PROP_OVERLAY_HEIGHT, PROP_ALPHA }; #define VIDEO_CAPS \ GST_VIDEO_CAPS_BGRx ";" \ GST_VIDEO_CAPS_RGB ";" \ GST_VIDEO_CAPS_BGR ";" \ GST_VIDEO_CAPS_RGBx ";" \ GST_VIDEO_CAPS_xRGB ";" \ GST_VIDEO_CAPS_xBGR ";" \ GST_VIDEO_CAPS_RGBA ";" \ GST_VIDEO_CAPS_BGRA ";" \ GST_VIDEO_CAPS_ARGB ";" \ GST_VIDEO_CAPS_ABGR ";" \ GST_VIDEO_CAPS_YUV ("{I420, YV12, AYUV, YUY2, UYVY, v308, v210," \ " v216, Y41B, Y42B, Y444, Y800, Y16, NV12, NV21, UYVP, A420," \ " YUV9, IYU1}") static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS (VIDEO_CAPS) ); static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS (VIDEO_CAPS) ); GST_BOILERPLATE (GstGdkPixbufOverlay, gst_gdk_pixbuf_overlay, GstVideoFilter, GST_TYPE_VIDEO_FILTER); static void gst_gdk_pixbuf_overlay_base_init (gpointer g_class) { GstElementClass *element_class = GST_ELEMENT_CLASS (g_class); gst_element_class_add_static_pad_template (element_class, &sink_template); gst_element_class_add_static_pad_template (element_class, &src_template); gst_element_class_set_static_metadata (element_class, "GdkPixbuf Overlay", "Filter/Effect/Video", "Overlay an image onto a video stream", "Tim-Philipp Müller "); } static void gst_gdk_pixbuf_overlay_class_init (GstGdkPixbufOverlayClass * klass) { GstBaseTransformClass *basetrans_class = GST_BASE_TRANSFORM_CLASS (klass); GObjectClass *gobject_class = G_OBJECT_CLASS (klass); gobject_class->set_property = gst_gdk_pixbuf_overlay_set_property; gobject_class->get_property = gst_gdk_pixbuf_overlay_get_property; gobject_class->finalize = gst_gdk_pixbuf_overlay_finalize; basetrans_class->start = GST_DEBUG_FUNCPTR (gst_gdk_pixbuf_overlay_start); basetrans_class->stop = GST_DEBUG_FUNCPTR (gst_gdk_pixbuf_overlay_stop); basetrans_class->set_caps = GST_DEBUG_FUNCPTR (gst_gdk_pixbuf_overlay_set_caps); basetrans_class->transform_ip = GST_DEBUG_FUNCPTR (gst_gdk_pixbuf_overlay_transform_ip); basetrans_class->before_transform = GST_DEBUG_FUNCPTR (gst_gdk_pixbuf_overlay_before_transform); g_object_class_install_property (gobject_class, PROP_LOCATION, g_param_spec_string ("location", "location", "Location of image file to overlay", NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_OFFSET_X, g_param_spec_int ("offset-x", "X Offset", "Horizontal offset of overlay image in pixels from top-left corner " "of video image", G_MININT, G_MAXINT, 0, GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_OFFSET_Y, g_param_spec_int ("offset-y", "Y Offset", "Vertical offset of overlay image in pixels from top-left corner " "of video image", G_MININT, G_MAXINT, 0, GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_RELATIVE_X, g_param_spec_double ("relative-x", "Relative X Offset", "Horizontal offset of overlay image in fractions of video image " "width, from top-left corner of video image", 0.0, 1.0, 0.0, GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_RELATIVE_Y, g_param_spec_double ("relative-y", "Relative Y Offset", "Vertical offset of overlay image in fractions of video image " "height, from top-left corner of video image", 0.0, 1.0, 0.0, GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_OVERLAY_WIDTH, g_param_spec_int ("overlay-width", "Overlay Width", "Width of overlay image in pixels (0 = same as overlay image)", 0, G_MAXINT, 0, GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_OVERLAY_HEIGHT, g_param_spec_int ("overlay-height", "Overlay Height", "Height of overlay image in pixels (0 = same as overlay image)", 0, G_MAXINT, 0, GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_ALPHA, g_param_spec_double ("alpha", "Alpha", "Global alpha of overlay image", 0.0, 1.0, 1.0, GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); GST_DEBUG_CATEGORY_INIT (gdkpixbufoverlay_debug, "gdkpixbufoverlay", 0, "debug category for gdkpixbufoverlay element"); } static void gst_gdk_pixbuf_overlay_init (GstGdkPixbufOverlay * overlay, GstGdkPixbufOverlayClass * overlay_class) { overlay->offset_x = 0; overlay->offset_y = 0; overlay->relative_x = 0.0; overlay->relative_y = 0.0; overlay->overlay_width = 0; overlay->overlay_height = 0; overlay->alpha = 1.0; } void gst_gdk_pixbuf_overlay_set_property (GObject * object, guint property_id, const GValue * value, GParamSpec * pspec) { GstGdkPixbufOverlay *overlay = GST_GDK_PIXBUF_OVERLAY (object); GST_OBJECT_LOCK (overlay); switch (property_id) { case PROP_LOCATION: g_free (overlay->location); overlay->location = g_value_dup_string (value); break; case PROP_OFFSET_X: overlay->offset_x = g_value_get_int (value); overlay->update_composition = TRUE; break; case PROP_OFFSET_Y: overlay->offset_y = g_value_get_int (value); overlay->update_composition = TRUE; break; case PROP_RELATIVE_X: overlay->relative_x = g_value_get_double (value); overlay->update_composition = TRUE; break; case PROP_RELATIVE_Y: overlay->relative_y = g_value_get_double (value); overlay->update_composition = TRUE; break; case PROP_OVERLAY_WIDTH: overlay->overlay_width = g_value_get_int (value); overlay->update_composition = TRUE; break; case PROP_OVERLAY_HEIGHT: overlay->overlay_height = g_value_get_int (value); overlay->update_composition = TRUE; break; case PROP_ALPHA: overlay->alpha = g_value_get_double (value); overlay->update_composition = TRUE; break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); break; } GST_OBJECT_UNLOCK (overlay); } void gst_gdk_pixbuf_overlay_get_property (GObject * object, guint property_id, GValue * value, GParamSpec * pspec) { GstGdkPixbufOverlay *overlay = GST_GDK_PIXBUF_OVERLAY (object); GST_OBJECT_LOCK (overlay); switch (property_id) { case PROP_LOCATION: g_value_set_string (value, overlay->location); break; case PROP_OFFSET_X: g_value_set_int (value, overlay->offset_x); break; case PROP_OFFSET_Y: g_value_set_int (value, overlay->offset_y); break; case PROP_RELATIVE_X: g_value_set_double (value, overlay->relative_x); break; case PROP_RELATIVE_Y: g_value_set_double (value, overlay->relative_y); break; case PROP_OVERLAY_WIDTH: g_value_set_int (value, overlay->overlay_width); break; case PROP_OVERLAY_HEIGHT: g_value_set_int (value, overlay->overlay_height); break; case PROP_ALPHA: g_value_set_double (value, overlay->alpha); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); break; } GST_OBJECT_UNLOCK (overlay); } void gst_gdk_pixbuf_overlay_finalize (GObject * object) { GstGdkPixbufOverlay *overlay = GST_GDK_PIXBUF_OVERLAY (object); g_free (overlay->location); overlay->location = NULL; G_OBJECT_CLASS (parent_class)->finalize (object); } static gboolean gst_gdk_pixbuf_overlay_load_image (GstGdkPixbufOverlay * overlay, GError ** err) { GdkPixbuf *pixbuf; guint8 *pixels, *p; gint width, height, stride, w, h; pixbuf = gdk_pixbuf_new_from_file (overlay->location, err); if (pixbuf == NULL) return FALSE; if (!gdk_pixbuf_get_has_alpha (pixbuf)) { GdkPixbuf *alpha_pixbuf; /* FIXME: we could do this much more efficiently ourselves below, but * we're lazy for now */ /* FIXME: perhaps expose substitute_color via properties */ alpha_pixbuf = gdk_pixbuf_add_alpha (pixbuf, FALSE, 0, 0, 0); g_object_unref (pixbuf); pixbuf = alpha_pixbuf; } width = gdk_pixbuf_get_width (pixbuf); height = gdk_pixbuf_get_height (pixbuf); stride = gdk_pixbuf_get_rowstride (pixbuf); pixels = gdk_pixbuf_get_pixels (pixbuf); /* the memory layout in GdkPixbuf is R-G-B-A, we want: * - B-G-R-A on little-endian platforms * - A-R-G-B on big-endian platforms */ for (h = 0; h < height; ++h) { p = pixels + (h * stride); for (w = 0; w < width; ++w) { guint8 tmp; /* R-G-B-A ==> B-G-R-A */ tmp = p[0]; p[0] = p[2]; p[2] = tmp; if (G_BYTE_ORDER == G_BIG_ENDIAN) { /* B-G-R-A ==> A-R-G-B */ /* we can probably assume sane alignment */ *((guint32 *) p) = GUINT32_SWAP_LE_BE (*((guint32 *) p)); } p += 4; } } overlay->pixels = gst_buffer_new (); GST_BUFFER_DATA (overlay->pixels) = pixels; /* assume we have row padding even for the last row */ GST_BUFFER_SIZE (overlay->pixels) = height * stride; /* transfer ownership of pixbuf to buffer */ GST_BUFFER_MALLOCDATA (overlay->pixels) = (guint8 *) pixbuf; GST_BUFFER_FREE_FUNC (overlay->pixels) = (GFreeFunc) g_object_unref; overlay->pixels_width = width; overlay->pixels_height = height; overlay->pixels_stride = stride; overlay->update_composition = TRUE; GST_INFO_OBJECT (overlay, "Loaded image, %d x %d", width, height); return TRUE; } static gboolean gst_gdk_pixbuf_overlay_start (GstBaseTransform * trans) { GstGdkPixbufOverlay *overlay = GST_GDK_PIXBUF_OVERLAY (trans); GError *err = NULL; if (overlay->location != NULL) { if (!gst_gdk_pixbuf_overlay_load_image (overlay, &err)) goto error_loading_image; gst_base_transform_set_passthrough (trans, FALSE); } else { GST_WARNING_OBJECT (overlay, "no image location set, doing nothing"); gst_base_transform_set_passthrough (trans, TRUE); } return TRUE; /* ERRORS */ error_loading_image: { GST_ELEMENT_ERROR (overlay, RESOURCE, OPEN_READ, ("Could not load overlay image."), ("%s", err->message)); g_error_free (err); return FALSE; } } static gboolean gst_gdk_pixbuf_overlay_stop (GstBaseTransform * trans) { GstGdkPixbufOverlay *overlay = GST_GDK_PIXBUF_OVERLAY (trans); if (overlay->comp) { gst_video_overlay_composition_unref (overlay->comp); overlay->comp = NULL; } gst_buffer_replace (&overlay->pixels, NULL); return TRUE; } static gboolean gst_gdk_pixbuf_overlay_set_caps (GstBaseTransform * trans, GstCaps * incaps, GstCaps * outcaps) { GstGdkPixbufOverlay *overlay = GST_GDK_PIXBUF_OVERLAY (trans); GstVideoFormat video_format; int w, h; if (!gst_video_format_parse_caps (incaps, &video_format, &w, &h)) return FALSE; overlay->format = video_format; overlay->width = w; overlay->height = h; return TRUE; } static void gst_gdk_pixbuf_overlay_update_composition (GstGdkPixbufOverlay * overlay) { GstVideoOverlayComposition *comp; GstVideoOverlayRectangle *rect; gint x, y, width, height; if (overlay->comp) { gst_video_overlay_composition_unref (overlay->comp); overlay->comp = NULL; } if (overlay->alpha == 0.0) return; x = overlay->offset_x + (overlay->relative_x * overlay->pixels_width); y = overlay->offset_y + (overlay->relative_y * overlay->pixels_height); /* FIXME: this should work, but seems to crash */ if (x < 0) x = 0; if (y < 0) y = 0; width = overlay->overlay_width; if (width == 0) width = overlay->pixels_width; height = overlay->overlay_height; if (height == 0) height = overlay->pixels_height; GST_DEBUG_OBJECT (overlay, "overlay image dimensions: %d x %d, alpha=%.2f", overlay->pixels_width, overlay->pixels_height, overlay->alpha); GST_DEBUG_OBJECT (overlay, "properties: x,y: %d,%d (%g%%,%g%%) - WxH: %dx%d", overlay->offset_x, overlay->offset_y, overlay->relative_x * 100.0, overlay->relative_y * 100.0, overlay->overlay_height, overlay->overlay_width); GST_DEBUG_OBJECT (overlay, "overlay rendered: %d x %d @ %d,%d (onto %d x %d)", width, height, x, y, overlay->width, overlay->height); rect = gst_video_overlay_rectangle_new_argb (overlay->pixels, overlay->pixels_width, overlay->pixels_height, overlay->pixels_stride, x, y, width, height, GST_VIDEO_OVERLAY_FORMAT_FLAG_NONE); if (overlay->alpha != 1.0) gst_video_overlay_rectangle_set_global_alpha (rect, overlay->alpha); comp = gst_video_overlay_composition_new (rect); gst_video_overlay_rectangle_unref (rect); overlay->comp = comp; } static void gst_gdk_pixbuf_overlay_before_transform (GstBaseTransform * trans, GstBuffer * outbuf) { GstClockTime stream_time; stream_time = gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME, GST_BUFFER_TIMESTAMP (outbuf)); if (GST_CLOCK_TIME_IS_VALID (stream_time)) gst_object_sync_values (G_OBJECT (trans), stream_time); } static GstFlowReturn gst_gdk_pixbuf_overlay_transform_ip (GstBaseTransform * trans, GstBuffer * buf) { GstGdkPixbufOverlay *overlay = GST_GDK_PIXBUF_OVERLAY (trans); GST_OBJECT_LOCK (overlay); if (G_UNLIKELY (overlay->update_composition)) { gst_gdk_pixbuf_overlay_update_composition (overlay); overlay->update_composition = FALSE; } GST_OBJECT_UNLOCK (overlay); if (overlay->comp != NULL) gst_video_overlay_composition_blend (overlay->comp, buf); return GST_FLOW_OK; }