/* GStreamer * Copyright (C) <2009> Sebastian Dröge * * 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-rsvgdec * * This elements renders SVG graphics. * * * Example launch lines * |[ * gst-launch filesrc location=image.svg ! rsvgdec ! imagefreeze ! ffmpegcolorspace ! autovideosink * ]| render and show a svg image. * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "gstrsvgdec.h" #include GST_DEBUG_CATEGORY_STATIC (rsvgdec_debug); #define GST_CAT_DEFAULT rsvgdec_debug static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("image/svg+xml; image/svg")); #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_factory = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS (GST_RSVG_VIDEO_CAPS)); GST_BOILERPLATE (GstRsvgDec, gst_rsvg_dec, GstElement, GST_TYPE_ELEMENT); static void gst_rsvg_dec_reset (GstRsvgDec * rsvg); static GstFlowReturn gst_rsvg_dec_chain (GstPad * pad, GstBuffer * buffer); static gboolean gst_rsvg_dec_sink_set_caps (GstPad * pad, GstCaps * caps); static gboolean gst_rsvg_dec_sink_event (GstPad * pad, GstEvent * event); static gboolean gst_rsvg_dec_src_event (GstPad * pad, GstEvent * event); static gboolean gst_rsvg_dec_src_query (GstPad * pad, GstQuery * query); static const GstQueryType *gst_rsvg_dec_src_query_type (GstPad * pad); static gboolean gst_rsvg_dec_src_set_caps (GstPad * pad, GstCaps * caps); static GstStateChangeReturn gst_rsvg_dec_change_state (GstElement * element, GstStateChange transition); static void gst_rsvg_dec_finalize (GObject * object); static void gst_rsvg_dec_base_init (gpointer g_class) { GstElementClass *element_class = GST_ELEMENT_CLASS (g_class); gst_element_class_set_details_simple (element_class, "SVG image decoder", "Codec/Decoder/Image", "Uses librsvg to decode SVG images", "Sebastian Dröge "); gst_element_class_add_static_pad_template (element_class, &sink_factory); gst_element_class_add_static_pad_template (element_class, &src_factory); } static void gst_rsvg_dec_class_init (GstRsvgDecClass * klass) { GstElementClass *element_class = (GstElementClass *) klass; GObjectClass *gobject_class = (GObjectClass *) klass; GST_DEBUG_CATEGORY_INIT (rsvgdec_debug, "rsvgdec", 0, "RSVG decoder"); gobject_class->finalize = gst_rsvg_dec_finalize; element_class->change_state = GST_DEBUG_FUNCPTR (gst_rsvg_dec_change_state); } static void gst_rsvg_dec_init (GstRsvgDec * rsvg, GstRsvgDecClass * klass) { rsvg->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink"); gst_pad_set_setcaps_function (rsvg->sinkpad, gst_rsvg_dec_sink_set_caps); gst_pad_set_event_function (rsvg->sinkpad, gst_rsvg_dec_sink_event); gst_pad_set_chain_function (rsvg->sinkpad, gst_rsvg_dec_chain); gst_element_add_pad (GST_ELEMENT (rsvg), rsvg->sinkpad); rsvg->srcpad = gst_pad_new_from_static_template (&src_factory, "src"); gst_pad_set_event_function (rsvg->srcpad, gst_rsvg_dec_src_event); gst_pad_set_query_function (rsvg->srcpad, gst_rsvg_dec_src_query); gst_pad_set_query_type_function (rsvg->srcpad, gst_rsvg_dec_src_query_type); gst_pad_set_setcaps_function (rsvg->srcpad, gst_rsvg_dec_src_set_caps); gst_element_add_pad (GST_ELEMENT (rsvg), rsvg->srcpad); rsvg->adapter = gst_adapter_new (); gst_rsvg_dec_reset (rsvg); } static void gst_rsvg_dec_finalize (GObject * object) { GstRsvgDec *rsvg = GST_RSVG_DEC (object); if (rsvg->adapter) { g_object_unref (rsvg->adapter); rsvg->adapter = NULL; } G_OBJECT_CLASS (parent_class)->finalize (object); } static void gst_rsvg_dec_reset (GstRsvgDec * dec) { gst_adapter_clear (dec->adapter); dec->width = dec->height = 0; dec->fps_n = 0; dec->fps_d = 1; dec->first_timestamp = GST_CLOCK_TIME_NONE; dec->frame_count = 0; gst_segment_init (&dec->segment, GST_FORMAT_UNDEFINED); dec->need_newsegment = TRUE; g_list_foreach (dec->pending_events, (GFunc) gst_mini_object_unref, NULL); g_list_free (dec->pending_events); dec->pending_events = NULL; if (dec->pending_tags) { gst_tag_list_free (dec->pending_tags); dec->pending_tags = NULL; } } #define CAIRO_UNPREMULTIPLY(a,r,g,b) G_STMT_START { \ b = (a > 0) ? MIN ((b * 255 + a / 2) / a, 255) : 0; \ g = (a > 0) ? MIN ((g * 255 + a / 2) / a, 255) : 0; \ r = (a > 0) ? MIN ((r * 255 + a / 2) / a, 255) : 0; \ } G_STMT_END static void gst_rsvg_decode_unpremultiply (guint8 * data, gint width, gint height) { gint i, j; guint a; for (i = 0; i < height; i++) { for (j = 0; j < width; j++) { #if G_BYTE_ORDER == G_LITTLE_ENDIAN a = data[3]; data[0] = (a > 0) ? MIN ((data[0] * 255 + a / 2) / a, 255) : 0; data[1] = (a > 0) ? MIN ((data[1] * 255 + a / 2) / a, 255) : 0; data[2] = (a > 0) ? MIN ((data[2] * 255 + a / 2) / a, 255) : 0; #else a = data[0]; data[1] = (a > 0) ? MIN ((data[1] * 255 + a / 2) / a, 255) : 0; data[2] = (a > 0) ? MIN ((data[2] * 255 + a / 2) / a, 255) : 0; data[3] = (a > 0) ? MIN ((data[3] * 255 + a / 2) / a, 255) : 0; #endif data += 4; } } } static GstFlowReturn gst_rsvg_decode_image (GstRsvgDec * rsvg, const guint8 * data, guint size, GstBuffer ** buffer) { GstFlowReturn ret = GST_FLOW_OK; cairo_t *cr; cairo_surface_t *surface; RsvgHandle *handle; GError *error = NULL; RsvgDimensionData dimension; gdouble scalex, scaley; const gchar *title = NULL, *comment = NULL; GST_LOG_OBJECT (rsvg, "parsing svg"); handle = rsvg_handle_new_from_data (data, size, &error); if (!handle) { GST_ERROR_OBJECT (rsvg, "Failed to parse SVG image: %s", error->message); g_error_free (error); return GST_FLOW_ERROR; } title = rsvg_handle_get_title (handle); comment = rsvg_handle_get_desc (handle); if (title || comment) { GST_LOG_OBJECT (rsvg, "adding tags"); if (!rsvg->pending_tags) rsvg->pending_tags = gst_tag_list_new (); if (title && *title) gst_tag_list_add (rsvg->pending_tags, GST_TAG_MERGE_REPLACE_ALL, GST_TAG_TITLE, title, NULL); if (comment && *comment) gst_tag_list_add (rsvg->pending_tags, GST_TAG_MERGE_REPLACE_ALL, GST_TAG_COMMENT, comment, NULL); } rsvg_handle_get_dimensions (handle, &dimension); if (rsvg->width != dimension.width || rsvg->height != dimension.height) { GstCaps *caps1, *caps2, *caps3; GstStructure *s; GST_LOG_OBJECT (rsvg, "resolution changed, updating caps"); caps1 = gst_caps_copy (gst_pad_get_pad_template_caps (rsvg->srcpad)); caps2 = gst_pad_peer_get_caps (rsvg->srcpad); if (caps2) { caps3 = gst_caps_intersect (caps1, caps2); gst_caps_unref (caps1); gst_caps_unref (caps2); caps1 = caps3; caps3 = NULL; } if (gst_caps_is_empty (caps1)) { GST_ERROR_OBJECT (rsvg, "Unable to negotiate a format"); gst_caps_unref (caps1); g_object_unref (handle); return GST_FLOW_NOT_NEGOTIATED; } caps2 = gst_caps_copy (gst_pad_get_pad_template_caps (rsvg->srcpad)); s = gst_caps_get_structure (caps2, 0); gst_structure_set (s, "width", G_TYPE_INT, dimension.width, "height", G_TYPE_INT, dimension.height, "framerate", GST_TYPE_FRACTION, 0, 1, NULL); caps3 = gst_caps_intersect (caps1, caps2); if (!gst_caps_is_empty (caps3)) { gst_caps_truncate (caps3); gst_pad_set_caps (rsvg->srcpad, caps3); gst_caps_unref (caps1); gst_caps_unref (caps2); gst_caps_unref (caps3); rsvg->width = dimension.width; rsvg->height = dimension.height; } else { gst_caps_unref (caps2); gst_caps_unref (caps3); gst_caps_truncate (caps1); s = gst_caps_get_structure (caps1, 0); gst_structure_set (s, "framerate", GST_TYPE_FRACTION, 0, 1, NULL); if (!gst_caps_is_fixed (caps1) && (!gst_structure_fixate_field_nearest_int (s, "width", dimension.width) || !gst_structure_fixate_field_nearest_int (s, "height", dimension.height))) { g_object_unref (handle); GST_ERROR_OBJECT (rsvg, "Failed to fixate caps"); return GST_FLOW_NOT_NEGOTIATED; } gst_pad_set_caps (rsvg->srcpad, caps1); gst_structure_get_int (s, "width", &rsvg->width); gst_structure_get_int (s, "height", &rsvg->height); gst_caps_unref (caps1); } } if ((ret = gst_pad_alloc_buffer_and_set_caps (rsvg->srcpad, GST_BUFFER_OFFSET_NONE, rsvg->width * rsvg->height * 4, GST_PAD_CAPS (rsvg->srcpad), buffer)) != GST_FLOW_OK) { g_object_unref (handle); GST_ERROR_OBJECT (rsvg, "Buffer allocation failed %s", gst_flow_get_name (ret)); return ret; } GST_LOG_OBJECT (rsvg, "render image at %d x %d", rsvg->height, rsvg->width); surface = cairo_image_surface_create_for_data (GST_BUFFER_DATA (*buffer), CAIRO_FORMAT_ARGB32, rsvg->width, rsvg->height, rsvg->width * 4); cr = cairo_create (surface); cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR); cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.0); cairo_paint (cr); cairo_set_operator (cr, CAIRO_OPERATOR_OVER); cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 1.0); scalex = scaley = 1.0; if (rsvg->width != dimension.width) { scalex = ((gdouble) rsvg->width) / ((gdouble) dimension.width); } if (rsvg->height != dimension.height) { scaley = ((gdouble) rsvg->height) / ((gdouble) dimension.height); } cairo_scale (cr, scalex, scaley); rsvg_handle_render_cairo (handle, cr); g_object_unref (handle); cairo_destroy (cr); cairo_surface_destroy (surface); /* Now unpremultiply Cairo's ARGB to match GStreamer's */ gst_rsvg_decode_unpremultiply (GST_BUFFER_DATA (*buffer), rsvg->width, rsvg->height); return ret; } static GstFlowReturn gst_rsvg_dec_chain (GstPad * pad, GstBuffer * buffer) { GstRsvgDec *rsvg = GST_RSVG_DEC (GST_PAD_PARENT (pad)); gboolean completed = FALSE; const guint8 *data; guint size; gboolean ret = GST_FLOW_OK; /* first_timestamp is used slightly differently where a framerate is given or not. If there is a frame rate, it will be used as a base. If there is not, it will be used to keep track of the timestamp of the first buffer, to be used as the timestamp of the output buffer. When a buffer is output, first timestamp will resync to the next buffer's timestamp. */ if (rsvg->first_timestamp == GST_CLOCK_TIME_NONE) { if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer)) rsvg->first_timestamp = GST_BUFFER_TIMESTAMP (buffer); else if (rsvg->fps_n != 0) rsvg->first_timestamp = 0; } gst_adapter_push (rsvg->adapter, buffer); size = gst_adapter_available (rsvg->adapter); /* "" */ while (size >= 5 + 6 && ret == GST_FLOW_OK) { guint i; data = gst_adapter_peek (rsvg->adapter, size); for (i = size - 6; i >= 5; i--) { if (memcmp (data + i, "", 6) == 0) { completed = TRUE; size = i + 6; break; } } if (completed) { GstBuffer *outbuf = NULL; GST_LOG_OBJECT (rsvg, "have complete svg of %u bytes", size); data = gst_adapter_peek (rsvg->adapter, size); ret = gst_rsvg_decode_image (rsvg, data, size, &outbuf); if (ret != GST_FLOW_OK) break; if (rsvg->first_timestamp != GST_CLOCK_TIME_NONE) { GST_BUFFER_TIMESTAMP (outbuf) = rsvg->first_timestamp; GST_BUFFER_DURATION (outbuf) = GST_CLOCK_TIME_NONE; if (GST_BUFFER_DURATION_IS_VALID (buffer)) { GstClockTime end = GST_BUFFER_TIMESTAMP_IS_VALID (buffer) ? GST_BUFFER_TIMESTAMP (buffer) : rsvg->first_timestamp; end += GST_BUFFER_DURATION (buffer); GST_BUFFER_DURATION (outbuf) = end - GST_BUFFER_TIMESTAMP (outbuf); } if (rsvg->fps_n == 0) { rsvg->first_timestamp = GST_CLOCK_TIME_NONE; } else { GST_BUFFER_DURATION (outbuf) = gst_util_uint64_scale (rsvg->frame_count, rsvg->fps_d, rsvg->fps_n * GST_SECOND); } } else if (rsvg->fps_n != 0) { GST_BUFFER_TIMESTAMP (outbuf) = rsvg->first_timestamp + gst_util_uint64_scale (rsvg->frame_count, rsvg->fps_d, rsvg->fps_n * GST_SECOND); GST_BUFFER_DURATION (outbuf) = gst_util_uint64_scale (rsvg->frame_count, rsvg->fps_d, rsvg->fps_n * GST_SECOND); } else { GST_BUFFER_TIMESTAMP (outbuf) = rsvg->first_timestamp; GST_BUFFER_DURATION (outbuf) = GST_CLOCK_TIME_NONE; } rsvg->frame_count++; if (rsvg->need_newsegment) { gst_pad_push_event (rsvg->srcpad, gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME, 0, -1, 0)); rsvg->need_newsegment = FALSE; } if (rsvg->pending_events) { GList *l; for (l = rsvg->pending_events; l; l = l->next) gst_pad_push_event (rsvg->srcpad, l->data); g_list_free (rsvg->pending_events); rsvg->pending_events = NULL; } if (rsvg->pending_tags) { gst_element_found_tags (GST_ELEMENT_CAST (rsvg), rsvg->pending_tags); rsvg->pending_tags = NULL; } GST_LOG_OBJECT (rsvg, "image rendered okay"); ret = gst_pad_push (rsvg->srcpad, outbuf); if (ret != GST_FLOW_OK) break; gst_adapter_flush (rsvg->adapter, size); size = gst_adapter_available (rsvg->adapter); continue; } else { break; } } return GST_FLOW_OK; } static gboolean gst_rsvg_dec_sink_set_caps (GstPad * pad, GstCaps * caps) { GstRsvgDec *rsvg = GST_RSVG_DEC (gst_pad_get_parent (pad)); gboolean ret = TRUE; GstStructure *s = gst_caps_get_structure (caps, 0); gst_structure_get_fraction (s, "framerate", &rsvg->fps_n, &rsvg->fps_d); gst_object_unref (rsvg); return ret; } static gboolean gst_rsvg_dec_sink_event (GstPad * pad, GstEvent * event) { GstRsvgDec *rsvg = GST_RSVG_DEC (gst_pad_get_parent (pad)); gboolean res = FALSE; switch (GST_EVENT_TYPE (event)) { case GST_EVENT_NEWSEGMENT:{ gdouble rate, arate; gboolean update; gint64 start, stop, position; GstFormat fmt; gst_event_parse_new_segment_full (event, &update, &rate, &arate, &fmt, &start, &stop, &position); gst_segment_set_newsegment_full (&rsvg->segment, update, rate, arate, fmt, start, stop, position); if (fmt == GST_FORMAT_TIME) { rsvg->need_newsegment = FALSE; res = gst_pad_push_event (rsvg->srcpad, event); } else { gst_event_unref (event); res = TRUE; } break; } case GST_EVENT_EOS: case GST_EVENT_FLUSH_STOP: gst_adapter_clear (rsvg->adapter); /* fall through */ case GST_EVENT_FLUSH_START: res = gst_pad_push_event (rsvg->srcpad, event); break; default: if (GST_PAD_CAPS (rsvg->srcpad)) { res = gst_pad_push_event (rsvg->srcpad, event); } else { res = TRUE; rsvg->pending_events = g_list_append (rsvg->pending_events, event); } break; } gst_object_unref (rsvg); return res; } static gboolean gst_rsvg_dec_src_event (GstPad * pad, GstEvent * event) { GstRsvgDec *rsvg = GST_RSVG_DEC (gst_pad_get_parent (pad)); gboolean res = FALSE; switch (GST_EVENT_TYPE (event)) { default: res = gst_pad_push_event (rsvg->sinkpad, event); break; } gst_object_unref (rsvg); return res; } static const GstQueryType * gst_rsvg_dec_src_query_type (GstPad * pad) { static const GstQueryType query_types[] = { (GstQueryType) 0 }; return query_types; } static gboolean gst_rsvg_dec_src_query (GstPad * pad, GstQuery * query) { GstRsvgDec *rsvg = GST_RSVG_DEC (gst_pad_get_parent (pad)); gboolean res = TRUE; switch (GST_QUERY_TYPE (query)) { default: res = gst_pad_query_default (pad, query); break; } gst_object_unref (rsvg); return res; } static gboolean gst_rsvg_dec_src_set_caps (GstPad * pad, GstCaps * caps) { GstRsvgDec *rsvg = GST_RSVG_DEC (gst_pad_get_parent (pad)); gboolean ret = TRUE; GstStructure *s = gst_caps_get_structure (caps, 0); ret &= gst_structure_get_int (s, "width", &rsvg->width); ret &= gst_structure_get_int (s, "height", &rsvg->height); gst_object_unref (rsvg); return ret; } static GstStateChangeReturn gst_rsvg_dec_change_state (GstElement * element, GstStateChange transition) { GstStateChangeReturn res; GstRsvgDec *dec = GST_RSVG_DEC (element); switch (transition) { case GST_STATE_CHANGE_READY_TO_PAUSED: break; default: break; } res = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); if (res == GST_STATE_CHANGE_FAILURE) return res; switch (transition) { case GST_STATE_CHANGE_PAUSED_TO_READY: gst_rsvg_dec_reset (dec); break; default: break; } return res; }