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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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681 lines
20 KiB
C
681 lines
20 KiB
C
/*
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* GStreamer
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* Copyright (C) 2008 Filippo Argiolas <filippo.argiolas@gmail.com>
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-gloverlay
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*
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* Overlay GL video texture with a PNG image
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*
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* <refsect2>
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* <title>Examples</title>
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* |[
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* gst-launch-1.0 videotestsrc ! gloverlay location=image.jpg ! glimagesink
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* ]|
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* FBO (Frame Buffer Object) is required.
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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 <gst/gl/gstglconfig.h>
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#include "gstgloverlay.h"
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#include "effects/gstgleffectssources.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <jpeglib.h>
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#include <png.h>
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#if PNG_LIBPNG_VER >= 10400
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#define int_p_NULL NULL
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#define png_infopp_NULL NULL
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#endif
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#define GST_CAT_DEFAULT gst_gl_overlay_debug
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GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
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#define DEBUG_INIT \
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GST_DEBUG_CATEGORY_INIT (gst_gl_overlay_debug, "gloverlay", 0, "gloverlay element");
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G_DEFINE_TYPE_WITH_CODE (GstGLOverlay, gst_gl_overlay, GST_TYPE_GL_FILTER,
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DEBUG_INIT);
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static gboolean gst_gl_overlay_set_caps (GstGLFilter * filter,
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GstCaps * incaps, GstCaps * outcaps);
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static void gst_gl_overlay_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_gl_overlay_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static void gst_gl_overlay_reset_resources (GstGLFilter * filter);
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static void gst_gl_overlay_before_transform (GstBaseTransform * trans,
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GstBuffer * outbuf);
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static gboolean gst_gl_overlay_filter_texture (GstGLFilter * filter,
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guint in_tex, guint out_tex);
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static gint gst_gl_overlay_load_png (GstGLFilter * filter);
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static gint gst_gl_overlay_load_jpeg (GstGLFilter * filter);
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enum
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{
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PROP_0,
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PROP_LOCATION,
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PROP_OFFSET_X,
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PROP_OFFSET_Y,
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PROP_RELATIVE_X,
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PROP_RELATIVE_Y,
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PROP_OVERLAY_WIDTH,
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PROP_OVERLAY_HEIGHT,
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PROP_ALPHA
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};
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/* *INDENT-OFF* */
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/* vertex source */
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static const gchar *overlay_v_src =
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"attribute vec4 a_position;\n"
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"attribute vec2 a_texcoord;\n"
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"varying vec2 v_texcoord;\n"
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"void main()\n"
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"{\n"
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" gl_Position = a_position;\n"
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" v_texcoord = a_texcoord;\n"
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"}";
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/* fragment source */
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static const gchar *overlay_f_src =
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"#ifdef GL_ES\n"
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"precision mediump float;\n"
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"#endif\n"
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"uniform sampler2D texture;\n"
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"uniform float alpha;\n"
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"varying vec2 v_texcoord;\n"
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"void main()\n"
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"{\n"
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" vec4 rgba = texture2D( texture, v_texcoord );\n"
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" gl_FragColor = vec4(rgba.rgb, rgba.a * alpha);\n"
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"}\n";
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/* *INDENT-ON* */
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/* init resources that need a gl context */
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static gboolean
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gst_gl_overlay_init_gl_resources (GstGLFilter * filter)
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{
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GstGLOverlay *overlay = GST_GL_OVERLAY (filter);
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if (overlay->shader)
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gst_gl_context_del_shader (filter->context, overlay->shader);
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return gst_gl_context_gen_shader (filter->context, overlay_v_src,
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overlay_f_src, &overlay->shader);
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}
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/* free resources that need a gl context */
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static void
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gst_gl_overlay_reset_gl_resources (GstGLFilter * filter)
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{
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GstGLOverlay *overlay = GST_GL_OVERLAY (filter);
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if (overlay->shader) {
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gst_gl_context_del_shader (filter->context, overlay->shader);
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overlay->shader = NULL;
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}
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if (overlay->image_memory) {
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gst_memory_unref ((GstMemory *) overlay->image_memory);
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overlay->image_memory = NULL;
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}
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}
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static void
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gst_gl_overlay_class_init (GstGLOverlayClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *element_class;
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gobject_class = (GObjectClass *) klass;
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element_class = GST_ELEMENT_CLASS (klass);
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gobject_class->set_property = gst_gl_overlay_set_property;
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gobject_class->get_property = gst_gl_overlay_get_property;
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GST_GL_FILTER_CLASS (klass)->set_caps = gst_gl_overlay_set_caps;
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GST_GL_FILTER_CLASS (klass)->filter_texture = gst_gl_overlay_filter_texture;
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GST_GL_FILTER_CLASS (klass)->display_reset_cb =
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gst_gl_overlay_reset_gl_resources;
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GST_GL_FILTER_CLASS (klass)->onStop = gst_gl_overlay_reset_resources;
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GST_GL_FILTER_CLASS (klass)->onInitFBO = gst_gl_overlay_init_gl_resources;
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GST_BASE_TRANSFORM_CLASS (klass)->before_transform =
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GST_DEBUG_FUNCPTR (gst_gl_overlay_before_transform);
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g_object_class_install_property (gobject_class, PROP_LOCATION,
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g_param_spec_string ("location", "location",
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"Location of image file to overlay", NULL, GST_PARAM_CONTROLLABLE
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| GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE
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| G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_OFFSET_X,
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g_param_spec_int ("offset-x", "X Offset",
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"For positive value, horizontal offset of overlay image in pixels from"
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" left of video image. For negative value, horizontal offset of overlay"
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" image in pixels from right of video image", G_MININT, G_MAXINT, 0,
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GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE
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| G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_OFFSET_Y,
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g_param_spec_int ("offset-y", "Y Offset",
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"For positive value, vertical offset of overlay image in pixels from"
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" top of video image. For negative value, vertical offset of overlay"
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" image in pixels from bottom of video image", G_MININT, G_MAXINT, 0,
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GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE
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| G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_RELATIVE_X,
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g_param_spec_double ("relative-x", "Relative X Offset",
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"Horizontal offset of overlay image in fractions of video image "
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"width, from top-left corner of video image", 0.0, 1.0, 0.0,
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GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE
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| G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_RELATIVE_Y,
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g_param_spec_double ("relative-y", "Relative Y Offset",
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"Vertical offset of overlay image in fractions of video image "
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"height, from top-left corner of video image", 0.0, 1.0, 0.0,
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GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE
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| G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_OVERLAY_WIDTH,
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g_param_spec_int ("overlay-width", "Overlay Width",
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"Width of overlay image in pixels (0 = same as overlay image)", 0,
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G_MAXINT, 0,
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GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE
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| G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_OVERLAY_HEIGHT,
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g_param_spec_int ("overlay-height", "Overlay Height",
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"Height of overlay image in pixels (0 = same as overlay image)", 0,
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G_MAXINT, 0,
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GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE
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| G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_ALPHA,
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g_param_spec_double ("alpha", "Alpha", "Global alpha of overlay image",
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0.0, 1.0, 1.0, GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING
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| G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gst_element_class_set_metadata (element_class,
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"Gstreamer OpenGL Overlay", "Filter/Effect/Video",
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"Overlay GL video texture with a JPEG/PNG image",
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"Filippo Argiolas <filippo.argiolas@gmail.com>, "
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"Matthew Waters <matthew@centricular.com>");
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}
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/* rectangle in NDC */
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static void
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gst_gl_overlay_draw (GstGLOverlay * o, gboolean overlay_image, gfloat x,
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gfloat y, gfloat width, gfloat height)
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{
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GstGLFilter *filter = GST_GL_FILTER (o);
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const GstGLFuncs *gl = filter->context->gl_vtable;
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GLint attr_position_loc = 0;
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GLint attr_texture_loc = 0;
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gdouble alpha;
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/* *INDENT-OFF* */
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float v_vertices[] = {
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/*| Vertex | TexCoord |*/
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x, y, 0.0f, 0.0f, 0.0f,
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x + width, y, 0.0f, 1.0f, 0.0f,
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x + width, y + height, 0.0f, 1.0f, 1.0f,
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x, y + height, 0.0f, 0.0, 1.0f,
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};
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GLushort indices[] = {
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0, 1, 2,
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0, 2, 3,
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};
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/* *INDENT-ON* */
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gst_gl_shader_use (o->shader);
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alpha = overlay_image ? o->alpha : 1.0f;
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gst_gl_shader_set_uniform_1f (o->shader, "alpha", alpha);
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gst_gl_shader_set_uniform_1i (o->shader, "texture", 0);
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attr_position_loc =
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gst_gl_shader_get_attribute_location (o->shader, "a_position");
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attr_texture_loc =
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gst_gl_shader_get_attribute_location (o->shader, "a_texcoord");
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gl->VertexAttribPointer (attr_position_loc, 3, GL_FLOAT,
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GL_FALSE, 5 * sizeof (GLfloat), &v_vertices[0]);
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gl->VertexAttribPointer (attr_texture_loc, 2, GL_FLOAT,
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GL_FALSE, 5 * sizeof (GLfloat), &v_vertices[3]);
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gl->EnableVertexAttribArray (attr_position_loc);
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gl->EnableVertexAttribArray (attr_texture_loc);
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gl->DrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices);
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gl->DisableVertexAttribArray (attr_position_loc);
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gl->DisableVertexAttribArray (attr_texture_loc);
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gst_gl_context_clear_shader (filter->context);
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}
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static void
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gst_gl_overlay_load_texture (GstGLOverlay * o, GLuint tex,
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gboolean overlay_image)
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{
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GstGLFilter *filter = GST_GL_FILTER (o);
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const GstGLFuncs *gl = filter->context->gl_vtable;
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gfloat x, y, width, height;
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#if GST_GL_HAVE_OPENGL
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if (gst_gl_context_get_gl_api (filter->context) & GST_GL_API_OPENGL) {
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gl->MatrixMode (GL_MODELVIEW);
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gl->LoadIdentity ();
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}
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#endif
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gl->Enable (GL_TEXTURE_2D);
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gl->ActiveTexture (GL_TEXTURE0);
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gl->BindTexture (GL_TEXTURE_2D, tex);
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gl->Enable (GL_BLEND);
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gl->BlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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gl->BlendEquation (GL_FUNC_ADD);
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if (overlay_image) {
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gint render_width, render_height;
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/* scale from [0, 1] -> [-1, 1] */
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x = ((gfloat) o->offset_x / (gfloat) o->window_width +
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o->relative_x) * 2.0f - 1.0;
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y = ((gfloat) o->offset_y / (gfloat) o->window_height +
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o->relative_y) * 2.0f - 1.0;
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/* scale from [0, 1] -> [0, 2] */
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render_width = o->overlay_width > 0 ? o->overlay_width : o->image_width;
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render_height = o->overlay_height > 0 ? o->overlay_height : o->image_height;
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width = ((gfloat) render_width / (gfloat) o->window_width) * 2.0f;
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height = ((gfloat) render_height / (gfloat) o->window_height) * 2.0f;
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} else {
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/* scale from [0, 1] -> [-1, 1] */
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x = -1.0f;
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y = -1.0f;
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/* scale from [0, 1] -> [0, 2] */
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width = 2.0f;
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height = 2.0f;
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}
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gst_gl_overlay_draw (o, overlay_image, x, y, width, height);
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gl->Disable (GL_BLEND);
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}
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static void
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gst_gl_overlay_init (GstGLOverlay * overlay)
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{
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overlay->offset_x = 0;
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overlay->offset_y = 0;
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overlay->relative_x = 0.0;
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overlay->relative_y = 0.0;
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overlay->overlay_width = 0;
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overlay->overlay_height = 0;
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overlay->alpha = 1.0;
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}
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static void
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gst_gl_overlay_reset_resources (GstGLFilter * filter)
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{
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}
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static void
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gst_gl_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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GstGLOverlay *overlay = GST_GL_OVERLAY (object);
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switch (prop_id) {
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case PROP_LOCATION:
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if (overlay->location != NULL)
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g_free (overlay->location);
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overlay->location_has_changed = TRUE;
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overlay->location = g_value_dup_string (value);
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break;
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case PROP_OFFSET_X:
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overlay->offset_x = g_value_get_int (value);
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break;
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case PROP_OFFSET_Y:
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overlay->offset_y = g_value_get_int (value);
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break;
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case PROP_RELATIVE_X:
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overlay->relative_x = g_value_get_double (value);
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break;
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case PROP_RELATIVE_Y:
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overlay->relative_y = g_value_get_double (value);
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break;
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case PROP_OVERLAY_WIDTH:
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overlay->overlay_width = g_value_get_int (value);
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break;
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case PROP_OVERLAY_HEIGHT:
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overlay->overlay_height = g_value_get_int (value);
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break;
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case PROP_ALPHA:
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overlay->alpha = g_value_get_double (value);
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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 void
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gst_gl_overlay_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstGLOverlay *overlay = GST_GL_OVERLAY (object);
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switch (prop_id) {
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case PROP_LOCATION:
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g_value_set_string (value, overlay->location);
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break;
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case PROP_OFFSET_X:
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g_value_set_int (value, overlay->offset_x);
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break;
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case PROP_OFFSET_Y:
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g_value_set_int (value, overlay->offset_y);
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break;
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case PROP_RELATIVE_X:
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g_value_set_double (value, overlay->relative_x);
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break;
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case PROP_RELATIVE_Y:
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g_value_set_double (value, overlay->relative_y);
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break;
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case PROP_OVERLAY_WIDTH:
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g_value_set_int (value, overlay->overlay_width);
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break;
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case PROP_OVERLAY_HEIGHT:
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g_value_set_int (value, overlay->overlay_height);
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break;
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case PROP_ALPHA:
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g_value_set_double (value, overlay->alpha);
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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 gboolean
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gst_gl_overlay_set_caps (GstGLFilter * filter, GstCaps * incaps,
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GstCaps * outcaps)
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{
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GstGLOverlay *overlay = GST_GL_OVERLAY (filter);
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GstStructure *s = gst_caps_get_structure (incaps, 0);
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gint width = 0;
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gint height = 0;
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gst_structure_get_int (s, "width", &width);
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gst_structure_get_int (s, "height", &height);
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overlay->window_width = width;
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overlay->window_height = height;
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return TRUE;
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}
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static void
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gst_gl_overlay_callback (gint width, gint height, guint texture, gpointer stuff)
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{
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GstGLOverlay *overlay = GST_GL_OVERLAY (stuff);
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GstMapInfo map_info;
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guint image_tex;
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#if GST_GL_HAVE_OPENGL
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GstGLFilter *filter = GST_GL_FILTER (overlay);
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if (gst_gl_context_get_gl_api (filter->context) & GST_GL_API_OPENGL) {
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const GstGLFuncs *gl = filter->context->gl_vtable;
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gl->MatrixMode (GL_PROJECTION);
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gl->LoadIdentity ();
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}
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#endif
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gst_gl_overlay_load_texture (overlay, texture, FALSE);
|
|
|
|
if (overlay->image_memory == NULL || overlay->alpha == 0.0)
|
|
return;
|
|
|
|
if (!gst_memory_map ((GstMemory *) overlay->image_memory, &map_info,
|
|
GST_MAP_READ | GST_MAP_GL) || map_info.data == NULL)
|
|
return;
|
|
|
|
image_tex = *(guint *) map_info.data;
|
|
|
|
gst_gl_overlay_load_texture (overlay, image_tex, TRUE);
|
|
|
|
gst_memory_unmap ((GstMemory *) overlay->image_memory, &map_info);
|
|
}
|
|
|
|
static gboolean
|
|
gst_gl_overlay_filter_texture (GstGLFilter * filter, guint in_tex,
|
|
guint out_tex)
|
|
{
|
|
GstGLOverlay *overlay = GST_GL_OVERLAY (filter);
|
|
|
|
if (overlay->location_has_changed) {
|
|
if (overlay->image_memory) {
|
|
gst_memory_unref ((GstMemory *) overlay->image_memory);
|
|
overlay->image_memory = NULL;
|
|
}
|
|
if (overlay->location != NULL) {
|
|
if ((overlay->type_file = gst_gl_overlay_load_png (filter)) == 0) {
|
|
if ((overlay->type_file = gst_gl_overlay_load_jpeg (filter)) == 0) {
|
|
return FALSE;
|
|
}
|
|
}
|
|
}
|
|
|
|
overlay->location_has_changed = FALSE;
|
|
}
|
|
|
|
gst_gl_filter_render_to_target (filter, TRUE, in_tex, out_tex,
|
|
gst_gl_overlay_callback, overlay);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
gst_gl_overlay_before_transform (GstBaseTransform * trans, GstBuffer * outbuf)
|
|
{
|
|
GstClockTime stream_time;
|
|
|
|
stream_time = gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME,
|
|
GST_BUFFER_TIMESTAMP (outbuf));
|
|
|
|
if (GST_CLOCK_TIME_IS_VALID (stream_time))
|
|
gst_object_sync_values (GST_OBJECT (trans), stream_time);
|
|
}
|
|
|
|
static void
|
|
user_warning_fn (png_structp png_ptr, png_const_charp warning_msg)
|
|
{
|
|
g_warning ("%s\n", warning_msg);
|
|
}
|
|
|
|
#define LOAD_ERROR(msg) { GST_WARNING ("unable to load %s: %s", overlay->location, msg); return FALSE; }
|
|
|
|
static gint
|
|
gst_gl_overlay_load_jpeg (GstGLFilter * filter)
|
|
{
|
|
GstGLOverlay *overlay = GST_GL_OVERLAY (filter);
|
|
GstVideoInfo v_info;
|
|
GstMapInfo map_info;
|
|
FILE *fp = NULL;
|
|
struct jpeg_decompress_struct cinfo;
|
|
struct jpeg_error_mgr jerr;
|
|
JSAMPROW j;
|
|
int i;
|
|
|
|
fp = fopen (overlay->location, "rb");
|
|
if (!fp) {
|
|
g_error ("error: couldn't open file!\n");
|
|
return 0;
|
|
}
|
|
jpeg_create_decompress (&cinfo);
|
|
cinfo.err = jpeg_std_error (&jerr);
|
|
jpeg_stdio_src (&cinfo, fp);
|
|
jpeg_read_header (&cinfo, TRUE);
|
|
jpeg_start_decompress (&cinfo);
|
|
overlay->image_width = cinfo.image_width;
|
|
overlay->image_height = cinfo.image_height;
|
|
|
|
if (cinfo.num_components == 1)
|
|
gst_video_info_set_format (&v_info, GST_VIDEO_FORMAT_Y444,
|
|
overlay->image_width, overlay->image_height);
|
|
else
|
|
gst_video_info_set_format (&v_info, GST_VIDEO_FORMAT_RGB,
|
|
overlay->image_width, overlay->image_height);
|
|
|
|
overlay->image_memory =
|
|
(GstGLMemory *) gst_gl_memory_alloc (filter->context, &v_info, 0);
|
|
|
|
if (!gst_memory_map ((GstMemory *) overlay->image_memory, &map_info,
|
|
GST_MAP_WRITE)) {
|
|
LOAD_ERROR ("failed to map memory");
|
|
}
|
|
|
|
for (i = 0; i < overlay->image_height; ++i) {
|
|
j = (map_info.data +
|
|
(((int) overlay->image_height - (i +
|
|
1)) * (int) overlay->image_width * cinfo.num_components));
|
|
jpeg_read_scanlines (&cinfo, &j, 1);
|
|
}
|
|
jpeg_finish_decompress (&cinfo);
|
|
jpeg_destroy_decompress (&cinfo);
|
|
gst_memory_unmap ((GstMemory *) overlay->image_memory, &map_info);
|
|
fclose (fp);
|
|
return 2;
|
|
}
|
|
|
|
static gint
|
|
gst_gl_overlay_load_png (GstGLFilter * filter)
|
|
{
|
|
GstGLOverlay *overlay = GST_GL_OVERLAY (filter);
|
|
GstVideoInfo v_info;
|
|
GstMapInfo map_info;
|
|
|
|
png_structp png_ptr;
|
|
png_infop info_ptr;
|
|
png_uint_32 width = 0;
|
|
png_uint_32 height = 0;
|
|
gint bit_depth = 0;
|
|
gint color_type = 0;
|
|
gint interlace_type = 0;
|
|
png_FILE_p fp = NULL;
|
|
guint y = 0;
|
|
guchar **rows = NULL;
|
|
gint filler;
|
|
png_byte magic[8];
|
|
gint n_read;
|
|
|
|
if (!filter->context)
|
|
return 1;
|
|
|
|
if ((fp = fopen (overlay->location, "rb")) == NULL)
|
|
LOAD_ERROR ("file not found");
|
|
|
|
/* Read magic number */
|
|
n_read = fread (magic, 1, sizeof (magic), fp);
|
|
if (n_read != sizeof (magic)) {
|
|
fclose (fp);
|
|
LOAD_ERROR ("can't read PNG magic number");
|
|
}
|
|
|
|
/* Check for valid magic number */
|
|
if (png_sig_cmp (magic, 0, sizeof (magic))) {
|
|
fclose (fp);
|
|
LOAD_ERROR ("not a valid PNG image");
|
|
}
|
|
|
|
png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
|
|
|
|
if (png_ptr == NULL) {
|
|
fclose (fp);
|
|
LOAD_ERROR ("failed to initialize the png_struct");
|
|
}
|
|
|
|
png_set_error_fn (png_ptr, NULL, NULL, user_warning_fn);
|
|
|
|
info_ptr = png_create_info_struct (png_ptr);
|
|
if (info_ptr == NULL) {
|
|
fclose (fp);
|
|
png_destroy_read_struct (&png_ptr, png_infopp_NULL, png_infopp_NULL);
|
|
LOAD_ERROR ("failed to initialize the memory for image information");
|
|
}
|
|
|
|
png_init_io (png_ptr, fp);
|
|
|
|
png_set_sig_bytes (png_ptr, sizeof (magic));
|
|
|
|
png_read_info (png_ptr, info_ptr);
|
|
|
|
png_get_IHDR (png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
|
|
&interlace_type, int_p_NULL, int_p_NULL);
|
|
|
|
if (color_type == PNG_COLOR_TYPE_RGB) {
|
|
filler = 0xff;
|
|
png_set_filler (png_ptr, filler, PNG_FILLER_AFTER);
|
|
color_type = PNG_COLOR_TYPE_RGB_ALPHA;
|
|
}
|
|
|
|
if (color_type != PNG_COLOR_TYPE_RGB_ALPHA) {
|
|
fclose (fp);
|
|
png_destroy_read_struct (&png_ptr, png_infopp_NULL, png_infopp_NULL);
|
|
LOAD_ERROR ("color type is not rgb");
|
|
}
|
|
|
|
overlay->image_width = width;
|
|
overlay->image_height = height;
|
|
|
|
gst_video_info_set_format (&v_info, GST_VIDEO_FORMAT_RGBA, width, height);
|
|
overlay->image_memory =
|
|
(GstGLMemory *) gst_gl_memory_alloc (filter->context, &v_info, 0);
|
|
|
|
if (!gst_memory_map ((GstMemory *) overlay->image_memory, &map_info,
|
|
GST_MAP_WRITE)) {
|
|
LOAD_ERROR ("failed to map memory");
|
|
}
|
|
rows = (guchar **) malloc (sizeof (guchar *) * height);
|
|
|
|
for (y = 0; y < height; ++y)
|
|
rows[y] = (guchar *) (map_info.data + y * width * 4);
|
|
|
|
png_read_image (png_ptr, rows);
|
|
|
|
free (rows);
|
|
gst_memory_unmap ((GstMemory *) overlay->image_memory, &map_info);
|
|
|
|
png_read_end (png_ptr, info_ptr);
|
|
png_destroy_read_struct (&png_ptr, &info_ptr, png_infopp_NULL);
|
|
fclose (fp);
|
|
|
|
return 1;
|
|
}
|