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SVG data may come through multiple buffers, so keep track of the timestamp of the first buffer, and use it in preference. https://bugzilla.gnome.org/show_bug.cgi?id=628284
603 lines
18 KiB
C
603 lines
18 KiB
C
/* GStreamer
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* Copyright (C) <2009> Sebastian Dröge <sebastian.droege@collabora.co.uk>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:element-rsvgdec
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*
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* This elements renders SVG graphics.
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*
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* <refsect2>
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* <title>Example launch lines</title>
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* |[
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* gst-launch filesrc location=image.svg ! rsvgdec ! imagefreeze ! ffmpegcolorspace ! autovideosink
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* ]| render and show a svg image.
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* </refsect2>
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstrsvgdec.h"
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#include <string.h>
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GST_DEBUG_CATEGORY_STATIC (rsvgdec_debug);
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#define GST_CAT_DEFAULT rsvgdec_debug
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static GstStaticPadTemplate sink_factory =
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GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("image/svg+xml; image/svg"));
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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#define GST_RSVG_VIDEO_CAPS GST_VIDEO_CAPS_BGRA
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#else
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#define GST_RSVG_VIDEO_CAPS GST_VIDEO_CAPS_ARGB
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#endif
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static GstStaticPadTemplate src_factory =
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GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_RSVG_VIDEO_CAPS));
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GST_BOILERPLATE (GstRsvgDec, gst_rsvg_dec, GstElement, GST_TYPE_ELEMENT);
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static void gst_rsvg_dec_reset (GstRsvgDec * rsvg);
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static GstFlowReturn gst_rsvg_dec_chain (GstPad * pad, GstBuffer * buffer);
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static gboolean gst_rsvg_dec_sink_set_caps (GstPad * pad, GstCaps * caps);
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static gboolean gst_rsvg_dec_sink_event (GstPad * pad, GstEvent * event);
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static gboolean gst_rsvg_dec_src_event (GstPad * pad, GstEvent * event);
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static gboolean gst_rsvg_dec_src_query (GstPad * pad, GstQuery * query);
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static const GstQueryType *gst_rsvg_dec_src_query_type (GstPad * pad);
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static gboolean gst_rsvg_dec_src_set_caps (GstPad * pad, GstCaps * caps);
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static GstStateChangeReturn gst_rsvg_dec_change_state (GstElement * element,
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GstStateChange transition);
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static void gst_rsvg_dec_finalize (GObject * object);
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static void
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gst_rsvg_dec_base_init (gpointer g_class)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_set_details_simple (element_class,
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"SVG image decoder", "Codec/Decoder/Image",
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"Uses librsvg to decode SVG images",
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"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&sink_factory));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&src_factory));
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}
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static void
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gst_rsvg_dec_class_init (GstRsvgDecClass * klass)
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{
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GstElementClass *element_class = (GstElementClass *) klass;
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GObjectClass *gobject_class = (GObjectClass *) klass;
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GST_DEBUG_CATEGORY_INIT (rsvgdec_debug, "rsvgdec", 0, "RSVG decoder");
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gobject_class->finalize = gst_rsvg_dec_finalize;
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element_class->change_state = GST_DEBUG_FUNCPTR (gst_rsvg_dec_change_state);
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}
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static void
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gst_rsvg_dec_init (GstRsvgDec * rsvg, GstRsvgDecClass * klass)
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{
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rsvg->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink");
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gst_pad_set_setcaps_function (rsvg->sinkpad, gst_rsvg_dec_sink_set_caps);
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gst_pad_set_event_function (rsvg->sinkpad, gst_rsvg_dec_sink_event);
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gst_pad_set_chain_function (rsvg->sinkpad, gst_rsvg_dec_chain);
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gst_element_add_pad (GST_ELEMENT (rsvg), rsvg->sinkpad);
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rsvg->srcpad = gst_pad_new_from_static_template (&src_factory, "src");
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gst_pad_set_event_function (rsvg->srcpad, gst_rsvg_dec_src_event);
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gst_pad_set_query_function (rsvg->srcpad, gst_rsvg_dec_src_query);
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gst_pad_set_query_type_function (rsvg->srcpad, gst_rsvg_dec_src_query_type);
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gst_pad_set_setcaps_function (rsvg->srcpad, gst_rsvg_dec_src_set_caps);
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gst_element_add_pad (GST_ELEMENT (rsvg), rsvg->srcpad);
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rsvg->adapter = gst_adapter_new ();
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gst_rsvg_dec_reset (rsvg);
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}
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static void
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gst_rsvg_dec_finalize (GObject * object)
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{
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GstRsvgDec *rsvg = GST_RSVG_DEC (object);
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if (rsvg->adapter) {
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g_object_unref (rsvg->adapter);
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rsvg->adapter = NULL;
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}
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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gst_rsvg_dec_reset (GstRsvgDec * dec)
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{
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gst_adapter_clear (dec->adapter);
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dec->width = dec->height = 0;
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dec->fps_n = 0;
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dec->fps_d = 1;
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dec->first_timestamp = GST_CLOCK_TIME_NONE;
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dec->frame_count = 0;
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gst_segment_init (&dec->segment, GST_FORMAT_UNDEFINED);
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dec->need_newsegment = TRUE;
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g_list_foreach (dec->pending_events, (GFunc) gst_mini_object_unref, NULL);
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g_list_free (dec->pending_events);
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dec->pending_events = NULL;
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if (dec->pending_tags) {
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gst_tag_list_free (dec->pending_tags);
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dec->pending_tags = NULL;
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}
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}
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#define CAIRO_UNPREMULTIPLY(a,r,g,b) G_STMT_START { \
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b = (a > 0) ? MIN ((b * 255 + a / 2) / a, 255) : 0; \
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g = (a > 0) ? MIN ((g * 255 + a / 2) / a, 255) : 0; \
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r = (a > 0) ? MIN ((r * 255 + a / 2) / a, 255) : 0; \
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} G_STMT_END
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static void
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gst_rsvg_decode_unpremultiply (guint8 * data, gint width, gint height)
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{
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gint i, j;
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guint a;
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for (i = 0; i < height; i++) {
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for (j = 0; j < width; j++) {
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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a = data[3];
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data[0] = (a > 0) ? MIN ((data[0] * 255 + a / 2) / a, 255) : 0;
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data[1] = (a > 0) ? MIN ((data[1] * 255 + a / 2) / a, 255) : 0;
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data[2] = (a > 0) ? MIN ((data[2] * 255 + a / 2) / a, 255) : 0;
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#else
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a = data[0];
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data[1] = (a > 0) ? MIN ((data[1] * 255 + a / 2) / a, 255) : 0;
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data[2] = (a > 0) ? MIN ((data[2] * 255 + a / 2) / a, 255) : 0;
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data[3] = (a > 0) ? MIN ((data[3] * 255 + a / 2) / a, 255) : 0;
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#endif
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data += 4;
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}
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}
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}
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static GstFlowReturn
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gst_rsvg_decode_image (GstRsvgDec * rsvg, const guint8 * data, guint size,
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GstBuffer ** buffer)
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{
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GstFlowReturn ret = GST_FLOW_OK;
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cairo_t *cr;
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cairo_surface_t *surface;
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RsvgHandle *handle;
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GError *error = NULL;
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RsvgDimensionData dimension;
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gdouble scalex, scaley;
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const gchar *title = NULL, *comment = NULL;
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GST_LOG_OBJECT (rsvg, "parsing svg");
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handle = rsvg_handle_new_from_data (data, size, &error);
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if (!handle) {
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GST_ERROR_OBJECT (rsvg, "Failed to parse SVG image: %s", error->message);
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g_error_free (error);
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return GST_FLOW_ERROR;
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}
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title = rsvg_handle_get_title (handle);
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comment = rsvg_handle_get_desc (handle);
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if (title || comment) {
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GST_LOG_OBJECT (rsvg, "adding tags");
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if (!rsvg->pending_tags)
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rsvg->pending_tags = gst_tag_list_new ();
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if (title && *title)
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gst_tag_list_add (rsvg->pending_tags, GST_TAG_MERGE_REPLACE_ALL,
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GST_TAG_TITLE, title, NULL);
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if (comment && *comment)
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gst_tag_list_add (rsvg->pending_tags, GST_TAG_MERGE_REPLACE_ALL,
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GST_TAG_COMMENT, comment, NULL);
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}
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rsvg_handle_get_dimensions (handle, &dimension);
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if (rsvg->width != dimension.width || rsvg->height != dimension.height) {
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GstCaps *caps1, *caps2, *caps3;
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GstStructure *s;
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GST_LOG_OBJECT (rsvg, "resolution changed, updating caps");
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caps1 = gst_caps_copy (gst_pad_get_pad_template_caps (rsvg->srcpad));
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caps2 = gst_pad_peer_get_caps (rsvg->srcpad);
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if (caps2) {
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caps3 = gst_caps_intersect (caps1, caps2);
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gst_caps_unref (caps1);
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gst_caps_unref (caps2);
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caps1 = caps3;
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caps3 = NULL;
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}
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if (gst_caps_is_empty (caps1)) {
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GST_ERROR_OBJECT (rsvg, "Unable to negotiate a format");
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gst_caps_unref (caps1);
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g_object_unref (handle);
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return GST_FLOW_NOT_NEGOTIATED;
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}
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caps2 = gst_caps_copy (gst_pad_get_pad_template_caps (rsvg->srcpad));
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s = gst_caps_get_structure (caps2, 0);
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gst_structure_set (s, "width", G_TYPE_INT, dimension.width, "height",
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G_TYPE_INT, dimension.height, "framerate", GST_TYPE_FRACTION, 0, 1,
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NULL);
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caps3 = gst_caps_intersect (caps1, caps2);
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if (!gst_caps_is_empty (caps3)) {
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gst_caps_truncate (caps3);
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gst_pad_set_caps (rsvg->srcpad, caps3);
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gst_caps_unref (caps1);
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gst_caps_unref (caps2);
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gst_caps_unref (caps3);
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rsvg->width = dimension.width;
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rsvg->height = dimension.height;
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} else {
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gst_caps_unref (caps2);
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gst_caps_unref (caps3);
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gst_caps_truncate (caps1);
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s = gst_caps_get_structure (caps1, 0);
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gst_structure_set (s, "framerate", GST_TYPE_FRACTION, 0, 1, NULL);
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if (!gst_caps_is_fixed (caps1)
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&& (!gst_structure_fixate_field_nearest_int (s, "width",
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dimension.width)
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|| !gst_structure_fixate_field_nearest_int (s, "height",
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dimension.height))) {
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g_object_unref (handle);
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GST_ERROR_OBJECT (rsvg, "Failed to fixate caps");
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return GST_FLOW_NOT_NEGOTIATED;
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}
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gst_pad_set_caps (rsvg->srcpad, caps1);
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gst_structure_get_int (s, "width", &rsvg->width);
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gst_structure_get_int (s, "height", &rsvg->height);
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gst_caps_unref (caps1);
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}
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}
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if ((ret = gst_pad_alloc_buffer_and_set_caps (rsvg->srcpad,
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GST_BUFFER_OFFSET_NONE,
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rsvg->width * rsvg->height * 4,
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GST_PAD_CAPS (rsvg->srcpad), buffer)) != GST_FLOW_OK) {
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g_object_unref (handle);
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GST_ERROR_OBJECT (rsvg, "Buffer allocation failed %s",
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gst_flow_get_name (ret));
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return ret;
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}
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GST_LOG_OBJECT (rsvg, "render image at %d x %d", rsvg->height, rsvg->width);
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surface =
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cairo_image_surface_create_for_data (GST_BUFFER_DATA (*buffer),
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CAIRO_FORMAT_ARGB32, rsvg->width, rsvg->height, rsvg->width * 4);
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cr = cairo_create (surface);
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cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
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cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.0);
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cairo_paint (cr);
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cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
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cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 1.0);
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scalex = scaley = 1.0;
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if (rsvg->width != dimension.width) {
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scalex = ((gdouble) rsvg->width) / ((gdouble) dimension.width);
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}
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if (rsvg->height != dimension.height) {
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scaley = ((gdouble) rsvg->height) / ((gdouble) dimension.height);
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}
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cairo_scale (cr, scalex, scaley);
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rsvg_handle_render_cairo (handle, cr);
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g_object_unref (handle);
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cairo_destroy (cr);
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cairo_surface_destroy (surface);
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/* Now unpremultiply Cairo's ARGB to match GStreamer's */
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gst_rsvg_decode_unpremultiply (GST_BUFFER_DATA (*buffer), rsvg->width,
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rsvg->height);
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return ret;
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}
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static GstFlowReturn
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gst_rsvg_dec_chain (GstPad * pad, GstBuffer * buffer)
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{
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GstRsvgDec *rsvg = GST_RSVG_DEC (GST_PAD_PARENT (pad));
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gboolean completed = FALSE;
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const guint8 *data;
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guint size;
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gboolean ret = GST_FLOW_OK;
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/* first_timestamp is used slightly differently where a framerate
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is given or not.
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If there is a frame rate, it will be used as a base.
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If there is not, it will be used to keep track of the timestamp
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of the first buffer, to be used as the timestamp of the output
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buffer. When a buffer is output, first timestamp will resync to
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the next buffer's timestamp. */
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if (rsvg->first_timestamp == GST_CLOCK_TIME_NONE) {
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if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
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rsvg->first_timestamp = GST_BUFFER_TIMESTAMP (buffer);
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else if (rsvg->fps_n != 0)
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rsvg->first_timestamp = 0;
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}
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gst_adapter_push (rsvg->adapter, buffer);
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size = gst_adapter_available (rsvg->adapter);
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/* "<svg></svg>" */
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while (size >= 5 + 6 && ret == GST_FLOW_OK) {
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guint i;
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data = gst_adapter_peek (rsvg->adapter, size);
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for (i = size - 6; i >= 5; i--) {
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if (memcmp (data + i, "</svg>", 6) == 0) {
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completed = TRUE;
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size = i + 6;
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break;
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}
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}
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if (completed) {
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GstBuffer *outbuf = NULL;
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GST_LOG_OBJECT (rsvg, "have complete svg of %u bytes", size);
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data = gst_adapter_peek (rsvg->adapter, size);
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ret = gst_rsvg_decode_image (rsvg, data, size, &outbuf);
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if (ret != GST_FLOW_OK)
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break;
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if (rsvg->first_timestamp != GST_CLOCK_TIME_NONE) {
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GST_BUFFER_TIMESTAMP (outbuf) = rsvg->first_timestamp;
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GST_BUFFER_DURATION (outbuf) = GST_CLOCK_TIME_NONE;
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if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
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GstClockTime end =
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GST_BUFFER_TIMESTAMP_IS_VALID (buffer) ?
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GST_BUFFER_TIMESTAMP (buffer) : rsvg->first_timestamp;
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end += GST_BUFFER_DURATION (buffer);
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GST_BUFFER_DURATION (outbuf) = end - GST_BUFFER_TIMESTAMP (outbuf);
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}
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if (rsvg->fps_n == 0) {
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rsvg->first_timestamp = GST_CLOCK_TIME_NONE;
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} else {
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GST_BUFFER_DURATION (outbuf) =
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gst_util_uint64_scale (rsvg->frame_count, rsvg->fps_d,
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rsvg->fps_n * GST_SECOND);
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}
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} else if (rsvg->fps_n != 0) {
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GST_BUFFER_TIMESTAMP (outbuf) =
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rsvg->first_timestamp + gst_util_uint64_scale (rsvg->frame_count,
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rsvg->fps_d, rsvg->fps_n * GST_SECOND);
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GST_BUFFER_DURATION (outbuf) =
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gst_util_uint64_scale (rsvg->frame_count, rsvg->fps_d,
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rsvg->fps_n * GST_SECOND);
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} else {
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GST_BUFFER_TIMESTAMP (outbuf) = rsvg->first_timestamp;
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GST_BUFFER_DURATION (outbuf) = GST_CLOCK_TIME_NONE;
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}
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rsvg->frame_count++;
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if (rsvg->need_newsegment) {
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gst_pad_push_event (rsvg->srcpad,
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gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME, 0, -1, 0));
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rsvg->need_newsegment = FALSE;
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}
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if (rsvg->pending_events) {
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GList *l;
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for (l = rsvg->pending_events; l; l = l->next)
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gst_pad_push_event (rsvg->srcpad, l->data);
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g_list_free (rsvg->pending_events);
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rsvg->pending_events = NULL;
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}
|
|
|
|
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;
|
|
}
|