/* GStreamer * Copyright (C) 2010 Olivier Aubert * * 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., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /** * SECTION:element-rsvgoverlay * * This elements overlays SVG graphics over the video. SVG data can * either be specified through properties, or fed through the * data-sink pad. * * Note: setting the x or y parameter to a non-zero value will implicitly disable the fit-to-frame behaviour. * * * * Example launch lines * |[ * gst-launch -v videotestsrc ! ffmpegcolorspace ! rsvgoverlay location=foo.svg ! ffmpegcolorspace ! autovideosink * ]| specifies the SVG location through the filename property. * |[ * gst-launch -v videotestsrc ! ffmpegcolorspace ! rsvgoverlay name=overlay ! ffmpegcolorspace ! autovideosink filesrc location=foo.svg ! image/svg ! overlay.data_sink * ]| does the same by feeding data through the data_sink pad. You can also specify the SVG data itself as parameter: * |[ * gst-launch -v videotestsrc ! ffmpegcolorspace ! rsvgoverlay data='' ! ffmpegcolorspace ! autovideosink * ]| * */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include "gstrsvgoverlay.h" #include #include #include #include enum { PROP_0, PROP_DATA, PROP_FILENAME, PROP_FIT_TO_FRAME, PROP_X, PROP_Y, }; #define GST_RSVG_LOCK(overlay) G_STMT_START { \ GST_LOG_OBJECT (overlay, "Locking rsvgoverlay from thread %p", g_thread_self ()); \ g_static_mutex_lock (&overlay->rsvg_lock); \ GST_LOG_OBJECT (overlay, "Locked rsvgoverlay from thread %p", g_thread_self ()); \ } G_STMT_END #define GST_RSVG_UNLOCK(overlay) G_STMT_START { \ GST_LOG_OBJECT (overlay, "Unlocking rsvgoverlay from thread %p", g_thread_self ()); \ g_static_mutex_unlock (&overlay->rsvg_lock); \ } G_STMT_END #if G_BYTE_ORDER == G_LITTLE_ENDIAN #define GST_RSVG_VIDEO_CAPS GST_VIDEO_CAPS_BGRA #else #define GST_RSVG_VIDEO_CAPS GST_VIDEO_CAPS_ARGB #endif static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS (GST_RSVG_VIDEO_CAPS) ); static GstStaticPadTemplate video_sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS (GST_RSVG_VIDEO_CAPS) ); static GstStaticPadTemplate data_sink_template = GST_STATIC_PAD_TEMPLATE ("data_sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("image/svg+xml; image/svg; text/plain")); GST_BOILERPLATE (GstRsvgOverlay, gst_rsvg_overlay, GstVideoFilter, GST_TYPE_VIDEO_FILTER); static void gst_rsvg_overlay_set_svg_data (GstRsvgOverlay * overlay, const gchar * data, gboolean consider_as_filename) { GstBaseTransform *btrans = GST_BASE_TRANSFORM (overlay); gsize size; GError *error = NULL; if (overlay->handle) { g_object_unref (overlay->handle); overlay->handle = NULL; gst_base_transform_set_passthrough (btrans, TRUE); } /* data may be NULL */ if (data) { size = strlen (data); if (size) { /* Read data either from string or from file */ if (consider_as_filename) overlay->handle = rsvg_handle_new_from_file (data, &error); else overlay->handle = rsvg_handle_new_from_data ((guint8 *) data, size, &error); if (error) { GST_ERROR_OBJECT (overlay, "Cannot read SVG data: %s\n%s", error->message, data); g_error_free (error); } else { /* Get SVG dimension. */ RsvgDimensionData svg_dimension; rsvg_handle_get_dimensions (overlay->handle, &svg_dimension); overlay->width = svg_dimension.width; overlay->height = svg_dimension.height; gst_base_transform_set_passthrough (btrans, FALSE); } } } } static void gst_rsvg_overlay_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstRsvgOverlay *overlay = GST_RSVG_OVERLAY (object); GST_RSVG_LOCK (overlay); switch (prop_id) { case PROP_DATA: { gst_rsvg_overlay_set_svg_data (overlay, g_value_get_string (value), FALSE); break; } case PROP_FILENAME: { gst_rsvg_overlay_set_svg_data (overlay, g_value_get_string (value), TRUE); break; } case PROP_FIT_TO_FRAME: { overlay->fit_to_frame = g_value_get_boolean (value); break; } case PROP_X: { overlay->x_offset = g_value_get_int (value); break; } case PROP_Y: { overlay->y_offset = g_value_get_int (value); break; } default: { G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } GST_RSVG_UNLOCK (overlay); } static void gst_rsvg_overlay_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstRsvgOverlay *overlay = GST_RSVG_OVERLAY (object); switch (prop_id) { case PROP_X: g_value_set_uint (value, overlay->x_offset); break; case PROP_Y: g_value_set_uint (value, overlay->y_offset); break; case PROP_FIT_TO_FRAME: g_value_set_boolean (value, overlay->fit_to_frame); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static GstFlowReturn gst_rsvg_overlay_data_sink_chain (GstPad * pad, GstBuffer * buffer) { GstRsvgOverlay *overlay = GST_RSVG_OVERLAY (GST_PAD_PARENT (pad)); gst_adapter_push (overlay->adapter, buffer); return GST_FLOW_OK; } static gboolean gst_rsvg_overlay_data_sink_event (GstPad * pad, GstEvent * event) { GstRsvgOverlay *overlay = GST_RSVG_OVERLAY (GST_PAD_PARENT (pad)); GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event)); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_EOS:{ guint data_size; GST_RSVG_LOCK (overlay); /* FIXME: rsvgdec looks for in data to determine the end of SVG code. Should we really do the same here? IOW, could data be sent and _pushed() before the EOS gets processed? */ data_size = gst_adapter_available (overlay->adapter); if (data_size) { gst_rsvg_overlay_set_svg_data (overlay, (const gchar *) gst_adapter_take (overlay->adapter, data_size), FALSE); gst_adapter_clear (overlay->adapter); } GST_RSVG_UNLOCK (overlay); } case GST_EVENT_FLUSH_START: gst_adapter_clear (overlay->adapter); break; default: break; } /* Dropping all events here */ gst_event_unref (event); return TRUE; } static gboolean gst_rsvg_overlay_set_caps (GstBaseTransform * btrans, GstCaps * incaps, GstCaps * outcaps) { GstRsvgOverlay *overlay = GST_RSVG_OVERLAY (btrans); return G_LIKELY (gst_video_format_parse_caps (incaps, &overlay->caps_format, &overlay->caps_width, &overlay->caps_height)); } static GstFlowReturn gst_rsvg_overlay_transform_ip (GstBaseTransform * btrans, GstBuffer * buf) { GstRsvgOverlay *overlay = GST_RSVG_OVERLAY (btrans); cairo_surface_t *surface; cairo_t *cr; GST_RSVG_LOCK (overlay); if (!overlay->handle) { GST_RSVG_UNLOCK (overlay); return GST_FLOW_OK; } surface = cairo_image_surface_create_for_data (GST_BUFFER_DATA (buf), CAIRO_FORMAT_ARGB32, overlay->caps_width, overlay->caps_height, overlay->caps_width * 4); if (G_UNLIKELY (!surface)) return GST_FLOW_ERROR; cr = cairo_create (surface); if (G_UNLIKELY (!cr)) { cairo_surface_destroy (surface); return GST_FLOW_ERROR; } /* If x or y offset is specified, do not fit-to-frame. */ if (overlay->x_offset || overlay->y_offset) cairo_translate (cr, (double) overlay->x_offset, (double) overlay->y_offset); else if (overlay->fit_to_frame && overlay->width && overlay->height) cairo_scale (cr, (float) overlay->caps_width / overlay->width, (float) overlay->caps_height / overlay->height); rsvg_handle_render_cairo (overlay->handle, cr); GST_RSVG_UNLOCK (overlay); cairo_destroy (cr); cairo_surface_destroy (surface); return GST_FLOW_OK; } static gboolean gst_rsvg_overlay_stop (GstBaseTransform * btrans) { GstRsvgOverlay *overlay = GST_RSVG_OVERLAY (btrans); if (overlay->handle) { g_object_unref (overlay->handle); g_object_unref (overlay->adapter); overlay->handle = NULL; } return TRUE; } static void gst_rsvg_overlay_base_init (gpointer klass) { GstElementClass *element_class = GST_ELEMENT_CLASS (klass); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&src_template)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&video_sink_template)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&data_sink_template)); gst_element_class_set_details_simple (element_class, "RSVG overlay", "Filter/Editor/Video", "Overlays SVG graphics over a video stream", "Olivier Aubert "); } static void gst_rsvg_overlay_class_init (GstRsvgOverlayClass * klass) { GObjectClass *gobject_class = (GObjectClass *) klass; GstBaseTransformClass *basetransform_class = GST_BASE_TRANSFORM_CLASS (klass); gobject_class->set_property = gst_rsvg_overlay_set_property; gobject_class->get_property = gst_rsvg_overlay_get_property; g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DATA, g_param_spec_string ("data", "data", "SVG data.", "", G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_FILENAME, g_param_spec_string ("location", "location", "SVG file location.", "", G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_FIT_TO_FRAME, g_param_spec_boolean ("fit-to-frame", "fit to frame", "Fit the SVG to fill the whole frame.", TRUE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_X, g_param_spec_int ("x", "x offset", "Specify an x offset.", 0, G_MAXINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_Y, g_param_spec_int ("y", "y offset", "Specify a y offset.", 0, G_MAXINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); basetransform_class->set_caps = gst_rsvg_overlay_set_caps; basetransform_class->transform_ip = gst_rsvg_overlay_transform_ip; basetransform_class->stop = gst_rsvg_overlay_stop; basetransform_class->passthrough_on_same_caps = FALSE; } static void gst_rsvg_overlay_init (GstRsvgOverlay * overlay, GstRsvgOverlayClass * klass) { overlay->fit_to_frame = 1; overlay->adapter = gst_adapter_new (); /* data sink */ overlay->data_sinkpad = gst_pad_new_from_static_template (&data_sink_template, "data_sink"); gst_pad_set_chain_function (overlay->data_sinkpad, GST_DEBUG_FUNCPTR (gst_rsvg_overlay_data_sink_chain)); gst_pad_set_event_function (overlay->data_sinkpad, GST_DEBUG_FUNCPTR (gst_rsvg_overlay_data_sink_event)); gst_element_add_pad (GST_ELEMENT (overlay), overlay->data_sinkpad); }