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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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544 lines
17 KiB
C
544 lines
17 KiB
C
/* GStreamer
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* Copyright (C) 2010 Olivier Aubert <olivier.aubert@liris.cnrs.fr>
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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-rsvgoverlay
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*
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* This elements overlays SVG graphics over the video. SVG data can
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* either be specified through properties, or fed through the
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* data-sink pad.
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*
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* Position and dimension of the SVG graphics can be achieved by
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* specifying appropriate dimensions in the SVG file itself, but
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* shortcuts are provided by the element to specify x/y position and
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* width/height dimension, both in absolute form (pixels) and in
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* relative form (percentage of video dimension).
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*
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* For any measure (x/y/width/height), the absolute value (in pixels)
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* takes precedence over the relative one if both are
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* specified. Absolute values must be set to 0 to disable them.
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*
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* If all parameters are 0, the image is displayed without rescaling
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* at (0, 0) position.
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*
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* The fit-to-frame property is a shortcut for displaying the SVG
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* overlay at (0, 0) position filling the whole screen. It modifies
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* the values of the x/y/width/height attributes, by setting
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* height-/width-relative to 1.0. and all other attributes to 0.
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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 -v videotestsrc ! ffmpegcolorspace ! rsvgoverlay location=foo.svg ! ffmpegcolorspace ! autovideosink
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* ]| specifies the SVG location through the filename property.
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* |[
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* gst-launch -v videotestsrc ! ffmpegcolorspace ! rsvgoverlay name=overlay ! ffmpegcolorspace ! autovideosink filesrc location=foo.svg ! image/svg ! overlay.data_sink
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* ]| does the same by feeding data through the data_sink pad. You can also specify the SVG data itself as parameter:
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* |[
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* gst-launch -v videotestsrc ! ffmpegcolorspace ! rsvgoverlay data='<svg viewBox="0 0 800 600"><image x="80%" y="80%" width="10%" height="10%" xlink:href="foo.jpg" /></svg>' ! ffmpegcolorspace ! autovideosink
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* ]|
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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 "gstrsvgoverlay.h"
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#include <string.h>
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#include <gst/video/video.h>
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#include <librsvg/rsvg.h>
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#include <librsvg/rsvg-cairo.h>
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enum
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{
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PROP_0,
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PROP_DATA,
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PROP_FILENAME,
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PROP_FIT_TO_FRAME,
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PROP_X,
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PROP_Y,
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PROP_X_RELATIVE,
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PROP_Y_RELATIVE,
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PROP_WIDTH,
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PROP_HEIGHT,
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PROP_WIDTH_RELATIVE,
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PROP_HEIGHT_RELATIVE
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};
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#define GST_RSVG_LOCK(overlay) G_STMT_START { \
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GST_LOG_OBJECT (overlay, "Locking rsvgoverlay from thread %p", g_thread_self ()); \
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g_static_mutex_lock (&overlay->rsvg_lock); \
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GST_LOG_OBJECT (overlay, "Locked rsvgoverlay from thread %p", g_thread_self ()); \
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} G_STMT_END
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#define GST_RSVG_UNLOCK(overlay) G_STMT_START { \
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GST_LOG_OBJECT (overlay, "Unlocking rsvgoverlay from thread %p", g_thread_self ()); \
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g_static_mutex_unlock (&overlay->rsvg_lock); \
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} G_STMT_END
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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_template = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_RSVG_VIDEO_CAPS)
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);
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static GstStaticPadTemplate video_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_RSVG_VIDEO_CAPS)
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);
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static GstStaticPadTemplate data_sink_template =
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GST_STATIC_PAD_TEMPLATE ("data_sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("image/svg+xml; image/svg; text/plain"));
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GST_BOILERPLATE (GstRsvgOverlay, gst_rsvg_overlay, GstVideoFilter,
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GST_TYPE_VIDEO_FILTER);
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static void
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gst_rsvg_overlay_set_svg_data (GstRsvgOverlay * overlay, const gchar * data,
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gboolean consider_as_filename)
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{
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GstBaseTransform *btrans = GST_BASE_TRANSFORM (overlay);
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gsize size;
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GError *error = NULL;
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if (overlay->handle) {
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g_object_unref (overlay->handle);
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overlay->handle = NULL;
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gst_base_transform_set_passthrough (btrans, TRUE);
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}
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/* data may be NULL */
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if (data) {
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size = strlen (data);
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if (size) {
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/* Read data either from string or from file */
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if (consider_as_filename)
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overlay->handle = rsvg_handle_new_from_file (data, &error);
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else
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overlay->handle =
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rsvg_handle_new_from_data ((guint8 *) data, size, &error);
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if (error || overlay->handle == NULL) {
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if (error) {
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GST_ERROR_OBJECT (overlay, "Cannot read SVG data: %s\n%s",
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error->message, data);
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g_error_free (error);
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} else {
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GST_ERROR_OBJECT (overlay, "Cannot read SVG data: %s", data);
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}
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} else {
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/* Get SVG dimension. */
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RsvgDimensionData svg_dimension;
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rsvg_handle_get_dimensions (overlay->handle, &svg_dimension);
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overlay->svg_width = svg_dimension.width;
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overlay->svg_height = svg_dimension.height;
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gst_base_transform_set_passthrough (btrans, FALSE);
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}
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}
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}
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}
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static void
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gst_rsvg_overlay_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstRsvgOverlay *overlay = GST_RSVG_OVERLAY (object);
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GST_RSVG_LOCK (overlay);
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switch (prop_id) {
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case PROP_DATA:
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{
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gst_rsvg_overlay_set_svg_data (overlay, g_value_get_string (value),
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FALSE);
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break;
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}
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case PROP_FILENAME:
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{
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gst_rsvg_overlay_set_svg_data (overlay, g_value_get_string (value), TRUE);
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break;
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}
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case PROP_FIT_TO_FRAME:
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{
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if (g_value_get_boolean (value)) {
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overlay->x_offset = 0;
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overlay->y_offset = 0;
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overlay->x_relative = 0.0;
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overlay->y_relative = 0.0;
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overlay->width = 0;
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overlay->height = 0;
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overlay->width_relative = 1.0;
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overlay->height_relative = 1.0;
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} else {
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overlay->width_relative = 0;
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overlay->height_relative = 0;
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}
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break;
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}
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case PROP_X:
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{
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overlay->x_offset = g_value_get_int (value);
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break;
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}
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case PROP_Y:
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{
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overlay->y_offset = g_value_get_int (value);
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break;
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}
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case PROP_X_RELATIVE:
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{
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overlay->x_relative = g_value_get_float (value);
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break;
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}
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case PROP_Y_RELATIVE:
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{
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overlay->y_relative = g_value_get_float (value);
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break;
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}
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case PROP_WIDTH:
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{
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overlay->width = g_value_get_int (value);
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break;
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}
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case PROP_HEIGHT:
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{
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overlay->height = g_value_get_int (value);
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break;
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}
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case PROP_WIDTH_RELATIVE:
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{
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overlay->width_relative = g_value_get_float (value);
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break;
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}
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case PROP_HEIGHT_RELATIVE:
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{
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overlay->height_relative = g_value_get_float (value);
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break;
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}
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default:
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{
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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GST_RSVG_UNLOCK (overlay);
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}
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static void
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gst_rsvg_overlay_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstRsvgOverlay *overlay = GST_RSVG_OVERLAY (object);
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switch (prop_id) {
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case PROP_X:
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g_value_set_int (value, overlay->x_offset);
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break;
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case PROP_Y:
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g_value_set_int (value, overlay->y_offset);
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break;
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case PROP_X_RELATIVE:
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g_value_set_float (value, overlay->x_relative);
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break;
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case PROP_Y_RELATIVE:
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g_value_set_float (value, overlay->y_relative);
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break;
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case PROP_WIDTH:
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g_value_set_int (value, overlay->width);
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break;
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case PROP_HEIGHT:
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g_value_set_int (value, overlay->height);
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break;
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case PROP_WIDTH_RELATIVE:
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g_value_set_float (value, overlay->width_relative);
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break;
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case PROP_HEIGHT_RELATIVE:
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g_value_set_float (value, overlay->height_relative);
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break;
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case PROP_FIT_TO_FRAME:
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g_value_set_boolean (value, (overlay->width_relative == 1.0
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&& overlay->height_relative == 1.0));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static GstFlowReturn
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gst_rsvg_overlay_data_sink_chain (GstPad * pad, GstBuffer * buffer)
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{
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GstRsvgOverlay *overlay = GST_RSVG_OVERLAY (GST_PAD_PARENT (pad));
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gst_adapter_push (overlay->adapter, buffer);
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return GST_FLOW_OK;
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}
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static gboolean
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gst_rsvg_overlay_data_sink_event (GstPad * pad, GstEvent * event)
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{
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GstRsvgOverlay *overlay = GST_RSVG_OVERLAY (GST_PAD_PARENT (pad));
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GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event));
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_EOS:{
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guint data_size;
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GST_RSVG_LOCK (overlay);
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/* FIXME: rsvgdec looks for </svg> in data to determine the end
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of SVG code. Should we really do the same here? IOW, could
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data be sent and _pushed() before the EOS gets processed? */
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data_size = gst_adapter_available (overlay->adapter);
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if (data_size) {
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gst_rsvg_overlay_set_svg_data (overlay,
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(const gchar *) gst_adapter_take (overlay->adapter, data_size),
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FALSE);
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gst_adapter_clear (overlay->adapter);
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}
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GST_RSVG_UNLOCK (overlay);
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}
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case GST_EVENT_FLUSH_START:
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gst_adapter_clear (overlay->adapter);
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break;
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default:
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break;
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}
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/* Dropping all events here */
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gst_event_unref (event);
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return TRUE;
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}
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static gboolean
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gst_rsvg_overlay_set_caps (GstBaseTransform * btrans, GstCaps * incaps,
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GstCaps * outcaps)
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{
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GstRsvgOverlay *overlay = GST_RSVG_OVERLAY (btrans);
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return G_LIKELY (gst_video_format_parse_caps (incaps,
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&overlay->caps_format, &overlay->caps_width, &overlay->caps_height));
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}
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static GstFlowReturn
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gst_rsvg_overlay_transform_ip (GstBaseTransform * btrans, GstBuffer * buf)
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{
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GstRsvgOverlay *overlay = GST_RSVG_OVERLAY (btrans);
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cairo_surface_t *surface;
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cairo_t *cr;
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double applied_x_offset = (double) overlay->x_offset;
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double applied_y_offset = (double) overlay->y_offset;
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int applied_width = overlay->width;
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int applied_height = overlay->height;
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GST_RSVG_LOCK (overlay);
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if (!overlay->handle) {
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GST_RSVG_UNLOCK (overlay);
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return GST_FLOW_OK;
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}
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surface =
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cairo_image_surface_create_for_data (GST_BUFFER_DATA (buf),
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CAIRO_FORMAT_ARGB32, overlay->caps_width, overlay->caps_height,
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overlay->caps_width * 4);
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if (G_UNLIKELY (!surface))
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return GST_FLOW_ERROR;
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cr = cairo_create (surface);
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if (G_UNLIKELY (!cr)) {
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cairo_surface_destroy (surface);
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return GST_FLOW_ERROR;
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}
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/* Compute relative dimensions if absolute dimensions are not set */
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if (!applied_x_offset && overlay->x_relative) {
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applied_x_offset = overlay->x_relative * overlay->caps_width;
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}
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if (!applied_y_offset && overlay->y_relative) {
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applied_y_offset = overlay->y_relative * overlay->caps_height;
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}
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if (!applied_width && overlay->width_relative) {
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applied_width = (int) (overlay->width_relative * overlay->caps_width);
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}
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if (!applied_height && overlay->height_relative) {
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applied_height = (int) (overlay->height_relative * overlay->caps_height);
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}
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if (applied_x_offset || applied_y_offset) {
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cairo_translate (cr, applied_x_offset, applied_y_offset);
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}
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/* Scale when necessary, i.e. an absolute or relative dimension has been specified. */
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if ((applied_width || applied_height) && overlay->svg_width
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&& overlay->svg_height) {
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/* If may happen that only one of the dimension is specified. Use
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the original SVG size for the other dimension. */
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if (!applied_width)
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applied_width = overlay->svg_width;
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if (!applied_height)
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applied_height = overlay->svg_height;
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cairo_scale (cr, (double) applied_width / overlay->svg_width,
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(double) applied_height / overlay->svg_height);
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}
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rsvg_handle_render_cairo (overlay->handle, cr);
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GST_RSVG_UNLOCK (overlay);
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cairo_destroy (cr);
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cairo_surface_destroy (surface);
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return GST_FLOW_OK;
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}
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static gboolean
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gst_rsvg_overlay_stop (GstBaseTransform * btrans)
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{
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GstRsvgOverlay *overlay = GST_RSVG_OVERLAY (btrans);
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if (overlay->handle) {
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g_object_unref (overlay->handle);
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g_object_unref (overlay->adapter);
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overlay->handle = NULL;
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}
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return TRUE;
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}
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static void
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gst_rsvg_overlay_base_init (gpointer klass)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&src_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&video_sink_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&data_sink_template));
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gst_element_class_set_details_simple (element_class, "RSVG overlay",
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"Filter/Editor/Video",
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"Overlays SVG graphics over a video stream",
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"Olivier Aubert <olivier.aubert@liris.cnrs.fr>");
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}
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static void
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gst_rsvg_overlay_class_init (GstRsvgOverlayClass * klass)
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{
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GObjectClass *gobject_class = (GObjectClass *) klass;
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GstBaseTransformClass *basetransform_class = GST_BASE_TRANSFORM_CLASS (klass);
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gobject_class->set_property = gst_rsvg_overlay_set_property;
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gobject_class->get_property = gst_rsvg_overlay_get_property;
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DATA,
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g_param_spec_string ("data", "data", "SVG data.", "",
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G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_FILENAME,
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g_param_spec_string ("location", "location", "SVG file location.", "",
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G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_FIT_TO_FRAME,
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g_param_spec_boolean ("fit-to-frame", "fit to frame",
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"Fit the SVG to fill the whole frame.", TRUE,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_X,
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g_param_spec_int ("x", "x offset",
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"Specify an x offset.", -G_MAXINT, G_MAXINT, 0,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_Y,
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g_param_spec_int ("y", "y offset",
|
|
"Specify a y offset.", -G_MAXINT, G_MAXINT, 0,
|
|
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
|
|
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_X_RELATIVE,
|
|
g_param_spec_float ("x-relative", "x relative offset",
|
|
"Specify an x offset relative to the display size.", -G_MAXFLOAT,
|
|
G_MAXFLOAT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
|
|
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_Y_RELATIVE,
|
|
g_param_spec_float ("y-relative", "y relative offset",
|
|
"Specify a y offset relative to the display size.", -G_MAXFLOAT,
|
|
G_MAXFLOAT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
|
|
|
|
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_WIDTH,
|
|
g_param_spec_int ("width", "width",
|
|
"Specify a width in pixels.", -G_MAXINT, G_MAXINT, 0,
|
|
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
|
|
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_HEIGHT,
|
|
g_param_spec_int ("height", "height",
|
|
"Specify a height in pixels.", -G_MAXINT, G_MAXINT, 0,
|
|
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
|
|
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_WIDTH_RELATIVE,
|
|
g_param_spec_float ("width-relative", "relative width",
|
|
"Specify a width relative to the display size.", -G_MAXFLOAT,
|
|
G_MAXFLOAT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
|
|
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_HEIGHT_RELATIVE,
|
|
g_param_spec_float ("height-relative", "relative height",
|
|
"Specify a height relative to the display size.", -G_MAXFLOAT,
|
|
G_MAXFLOAT, 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->x_offset = 0;
|
|
overlay->y_offset = 0;
|
|
overlay->x_relative = 0.0;
|
|
overlay->y_relative = 0.0;
|
|
overlay->width = 0;
|
|
overlay->height = 0;
|
|
overlay->width_relative = 0.0;
|
|
overlay->height_relative = 0.0;
|
|
|
|
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);
|
|
}
|