/*
* GStreamer
* Copyright (C) 2008 Filippo Argiolas <filippo.argiolas@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-gloverlay
* @title: gloverlay
*
* Overlay GL video texture with a PNG image
*
* ## Examples
* |[
* gst-launch-1.0 videotestsrc ! gloverlay location=image.jpg ! glimagesink
* ]|
* FBO (Frame Buffer Object) is required.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/base/gsttypefindhelper.h>
#include <gst/gl/gstglconfig.h>
#include "gstgloverlay.h"
#include "effects/gstgleffectssources.h"
#include "gstglutils.h"
#include <stdio.h>
#include <stdlib.h>
#ifdef _MSC_VER
#define HAVE_BOOLEAN
#endif
#include <jpeglib.h>
#include <png.h>
#if PNG_LIBPNG_VER >= 10400
#define int_p_NULL NULL
#define png_infopp_NULL NULL
#endif
#define GST_CAT_DEFAULT gst_gl_overlay_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
#define DEBUG_INIT \
GST_DEBUG_CATEGORY_INIT (gst_gl_overlay_debug, "gloverlay", 0, "gloverlay element");
#define gst_gl_overlay_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstGLOverlay, gst_gl_overlay, GST_TYPE_GL_FILTER,
DEBUG_INIT);
static gboolean gst_gl_overlay_set_caps (GstGLFilter * filter,
GstCaps * incaps, GstCaps * outcaps);
static void gst_gl_overlay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_gl_overlay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_gl_overlay_before_transform (GstBaseTransform * trans,
GstBuffer * outbuf);
static gboolean gst_gl_overlay_filter_texture (GstGLFilter * filter,
GstGLMemory * in_tex, GstGLMemory * out_tex);
static gboolean gst_gl_overlay_load_png (GstGLOverlay * overlay, FILE * fp);
static gboolean gst_gl_overlay_load_jpeg (GstGLOverlay * overlay, FILE * fp);
enum
{
PROP_0,
PROP_LOCATION,
PROP_OFFSET_X,
PROP_OFFSET_Y,
PROP_RELATIVE_X,
PROP_RELATIVE_Y,
PROP_OVERLAY_WIDTH,
PROP_OVERLAY_HEIGHT,
PROP_ALPHA
};
/* *INDENT-OFF* */
/* vertex source */
static const gchar *overlay_v_src =
"attribute vec4 a_position;\n"
"attribute vec2 a_texcoord;\n"
"varying vec2 v_texcoord;\n"
"void main()\n"
"{\n"
" gl_Position = a_position;\n"
" v_texcoord = a_texcoord;\n"
"}";
/* fragment source */
static const gchar *overlay_f_src =
"#ifdef GL_ES\n"
"precision mediump float;\n"
"#endif\n"
"uniform sampler2D texture;\n"
"uniform float alpha;\n"
"varying vec2 v_texcoord;\n"
"void main()\n"
"{\n"
" vec4 rgba = texture2D( texture, v_texcoord );\n"
" gl_FragColor = vec4(rgba.rgb, rgba.a * alpha);\n"
"}\n";
/* *INDENT-ON* */
/* init resources that need a gl context */
static gboolean
gst_gl_overlay_gl_start (GstGLBaseFilter * base_filter)
{
GstGLOverlay *overlay = GST_GL_OVERLAY (base_filter);
if (!GST_GL_BASE_FILTER_CLASS (parent_class)->gl_start (base_filter))
return FALSE;
return gst_gl_context_gen_shader (base_filter->context, overlay_v_src,
overlay_f_src, &overlay->shader);
}
/* free resources that need a gl context */
static void
gst_gl_overlay_gl_stop (GstGLBaseFilter * base_filter)
{
GstGLOverlay *overlay = GST_GL_OVERLAY (base_filter);
const GstGLFuncs *gl = base_filter->context->gl_vtable;
if (overlay->shader) {
gst_object_unref (overlay->shader);
overlay->shader = NULL;
}
if (overlay->image_memory) {
gst_memory_unref ((GstMemory *) overlay->image_memory);
overlay->image_memory = NULL;
}
if (overlay->vao) {
gl->DeleteVertexArrays (1, &overlay->vao);
overlay->vao = 0;
}
if (overlay->vbo) {
gl->DeleteBuffers (1, &overlay->vbo);
overlay->vbo = 0;
}
if (overlay->vbo_indices) {
gl->DeleteBuffers (1, &overlay->vbo_indices);
overlay->vbo_indices = 0;
}
if (overlay->overlay_vao) {
gl->DeleteVertexArrays (1, &overlay->overlay_vao);
overlay->overlay_vao = 0;
}
if (overlay->overlay_vbo) {
gl->DeleteBuffers (1, &overlay->overlay_vbo);
overlay->overlay_vbo = 0;
}
GST_GL_BASE_FILTER_CLASS (parent_class)->gl_stop (base_filter);
}
static void
gst_gl_overlay_class_init (GstGLOverlayClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
gobject_class = (GObjectClass *) klass;
element_class = GST_ELEMENT_CLASS (klass);
gst_gl_filter_add_rgba_pad_templates (GST_GL_FILTER_CLASS (klass));
gobject_class->set_property = gst_gl_overlay_set_property;
gobject_class->get_property = gst_gl_overlay_get_property;
GST_GL_BASE_FILTER_CLASS (klass)->gl_start = gst_gl_overlay_gl_start;
GST_GL_BASE_FILTER_CLASS (klass)->gl_stop = gst_gl_overlay_gl_stop;
GST_GL_FILTER_CLASS (klass)->set_caps = gst_gl_overlay_set_caps;
GST_GL_FILTER_CLASS (klass)->filter_texture = gst_gl_overlay_filter_texture;
GST_BASE_TRANSFORM_CLASS (klass)->before_transform =
GST_DEBUG_FUNCPTR (gst_gl_overlay_before_transform);
g_object_class_install_property (gobject_class, PROP_LOCATION,
g_param_spec_string ("location", "location",
"Location of image file to overlay", NULL, GST_PARAM_CONTROLLABLE
| GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE
| G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_OFFSET_X,
g_param_spec_int ("offset-x", "X Offset",
"For positive value, horizontal offset of overlay image in pixels from"
" left of video image. For negative value, horizontal offset of overlay"
" image in pixels from right of video image", G_MININT, G_MAXINT, 0,
GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE
| G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_OFFSET_Y,
g_param_spec_int ("offset-y", "Y Offset",
"For positive value, vertical offset of overlay image in pixels from"
" top of video image. For negative value, vertical offset of overlay"
" image in pixels from bottom of video image", G_MININT, G_MAXINT, 0,
GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE
| G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_RELATIVE_X,
g_param_spec_double ("relative-x", "Relative X Offset",
"Horizontal offset of overlay image in fractions of video image "
"width, from top-left corner of video image", 0.0, 1.0, 0.0,
GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE
| G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_RELATIVE_Y,
g_param_spec_double ("relative-y", "Relative Y Offset",
"Vertical offset of overlay image in fractions of video image "
"height, from top-left corner of video image", 0.0, 1.0, 0.0,
GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE
| G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_OVERLAY_WIDTH,
g_param_spec_int ("overlay-width", "Overlay Width",
"Width of overlay image in pixels (0 = same as overlay image)", 0,
G_MAXINT, 0,
GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE
| G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_OVERLAY_HEIGHT,
g_param_spec_int ("overlay-height", "Overlay Height",
"Height of overlay image in pixels (0 = same as overlay image)", 0,
G_MAXINT, 0,
GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE
| G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_ALPHA,
g_param_spec_double ("alpha", "Alpha", "Global alpha of overlay image",
0.0, 1.0, 1.0, GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING
| G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_set_metadata (element_class,
"Gstreamer OpenGL Overlay", "Filter/Effect/Video",
"Overlay GL video texture with a JPEG/PNG image",
"Filippo Argiolas <filippo.argiolas@gmail.com>, "
"Matthew Waters <matthew@centricular.com>");
GST_GL_BASE_FILTER_CLASS (klass)->supported_gl_api =
GST_GL_API_OPENGL | GST_GL_API_GLES2 | GST_GL_API_OPENGL3;
}
static void
gst_gl_overlay_init (GstGLOverlay * overlay)
{
overlay->offset_x = 0;
overlay->offset_y = 0;
overlay->relative_x = 0.0;
overlay->relative_y = 0.0;
overlay->overlay_width = 0;
overlay->overlay_height = 0;
overlay->alpha = 1.0;
}
static void
gst_gl_overlay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstGLOverlay *overlay = GST_GL_OVERLAY (object);
switch (prop_id) {
case PROP_LOCATION:
g_free (overlay->location);
overlay->location_has_changed = TRUE;
overlay->location = g_value_dup_string (value);
break;
case PROP_OFFSET_X:
overlay->offset_x = g_value_get_int (value);
overlay->geometry_change = TRUE;
break;
case PROP_OFFSET_Y:
overlay->offset_y = g_value_get_int (value);
overlay->geometry_change = TRUE;
break;
case PROP_RELATIVE_X:
overlay->relative_x = g_value_get_double (value);
overlay->geometry_change = TRUE;
break;
case PROP_RELATIVE_Y:
overlay->relative_y = g_value_get_double (value);
overlay->geometry_change = TRUE;
break;
case PROP_OVERLAY_WIDTH:
overlay->overlay_width = g_value_get_int (value);
overlay->geometry_change = TRUE;
break;
case PROP_OVERLAY_HEIGHT:
overlay->overlay_height = g_value_get_int (value);
overlay->geometry_change = TRUE;
break;
case PROP_ALPHA:
overlay->alpha = g_value_get_double (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_gl_overlay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstGLOverlay *overlay = GST_GL_OVERLAY (object);
switch (prop_id) {
case PROP_LOCATION:
g_value_set_string (value, overlay->location);
break;
case PROP_OFFSET_X:
g_value_set_int (value, overlay->offset_x);
break;
case PROP_OFFSET_Y:
g_value_set_int (value, overlay->offset_y);
break;
case PROP_RELATIVE_X:
g_value_set_double (value, overlay->relative_x);
break;
case PROP_RELATIVE_Y:
g_value_set_double (value, overlay->relative_y);
break;
case PROP_OVERLAY_WIDTH:
g_value_set_int (value, overlay->overlay_width);
break;
case PROP_OVERLAY_HEIGHT:
g_value_set_int (value, overlay->overlay_height);
break;
case PROP_ALPHA:
g_value_set_double (value, overlay->alpha);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_gl_overlay_set_caps (GstGLFilter * filter, GstCaps * incaps,
GstCaps * outcaps)
{
GstGLOverlay *overlay = GST_GL_OVERLAY (filter);
GstStructure *s = gst_caps_get_structure (incaps, 0);
gint width = 0;
gint height = 0;
gst_structure_get_int (s, "width", &width);
gst_structure_get_int (s, "height", &height);
overlay->window_width = width;
overlay->window_height = height;
return TRUE;
}
static void
_unbind_buffer (GstGLOverlay * overlay)
{
GstGLFilter *filter = GST_GL_FILTER (overlay);
const GstGLFuncs *gl = GST_GL_BASE_FILTER (overlay)->context->gl_vtable;
gl->BindBuffer (GL_ELEMENT_ARRAY_BUFFER, 0);
gl->BindBuffer (GL_ARRAY_BUFFER, 0);
gl->DisableVertexAttribArray (filter->draw_attr_position_loc);
gl->DisableVertexAttribArray (filter->draw_attr_texture_loc);
}
static void
_bind_buffer (GstGLOverlay * overlay, GLuint vbo)
{
GstGLFilter *filter = GST_GL_FILTER (overlay);
const GstGLFuncs *gl = GST_GL_BASE_FILTER (overlay)->context->gl_vtable;
gl->BindBuffer (GL_ELEMENT_ARRAY_BUFFER, overlay->vbo_indices);
gl->BindBuffer (GL_ARRAY_BUFFER, vbo);
gl->EnableVertexAttribArray (filter->draw_attr_position_loc);
gl->EnableVertexAttribArray (filter->draw_attr_texture_loc);
gl->VertexAttribPointer (filter->draw_attr_position_loc, 3, GL_FLOAT,
GL_FALSE, 5 * sizeof (GLfloat), (void *) 0);
gl->VertexAttribPointer (filter->draw_attr_texture_loc, 2, GL_FLOAT,
GL_FALSE, 5 * sizeof (GLfloat), (void *) (3 * sizeof (GLfloat)));
}
/* *INDENT-OFF* */
float v_vertices[] = {
/*| Vertex | TexCoord |*/
-1.0f, -1.0f, 0.0f, 0.0f, 0.0f,
1.0f, -1.0f, 0.0f, 1.0f, 0.0f,
1.0f, 1.0f, 0.0f, 1.0f, 1.0f,
-1.0f, 1.0f, 0.0f, 0.0f, 1.0f,
};
static const GLushort indices[] = { 0, 1, 2, 0, 2, 3, };
/* *INDENT-ON* */
static gboolean
gst_gl_overlay_callback (GstGLFilter * filter, GstGLMemory * in_tex,
gpointer stuff)
{
GstGLOverlay *overlay = GST_GL_OVERLAY (filter);
GstMapInfo map_info;
guint image_tex;
gboolean memory_mapped = FALSE;
const GstGLFuncs *gl = GST_GL_BASE_FILTER (filter)->context->gl_vtable;
gboolean ret = FALSE;
#if GST_GL_HAVE_OPENGL
if (gst_gl_context_get_gl_api (GST_GL_BASE_FILTER (filter)->context) &
GST_GL_API_OPENGL) {
gl->MatrixMode (GL_PROJECTION);
gl->LoadIdentity ();
}
#endif
gl->ActiveTexture (GL_TEXTURE0);
gl->BindTexture (GL_TEXTURE_2D, gst_gl_memory_get_texture_id (in_tex));
gst_gl_shader_use (overlay->shader);
gst_gl_shader_set_uniform_1f (overlay->shader, "alpha", 1.0f);
gst_gl_shader_set_uniform_1i (overlay->shader, "texture", 0);
filter->draw_attr_position_loc =
gst_gl_shader_get_attribute_location (overlay->shader, "a_position");
filter->draw_attr_texture_loc =
gst_gl_shader_get_attribute_location (overlay->shader, "a_texcoord");
gst_gl_filter_draw_fullscreen_quad (filter);
if (!overlay->image_memory)
goto out;
if (!gst_memory_map ((GstMemory *) overlay->image_memory, &map_info,
GST_MAP_READ | GST_MAP_GL) || map_info.data == NULL)
goto out;
memory_mapped = TRUE;
image_tex = *(guint *) map_info.data;
if (!overlay->overlay_vbo) {
if (gl->GenVertexArrays) {
gl->GenVertexArrays (1, &overlay->overlay_vao);
gl->BindVertexArray (overlay->overlay_vao);
}
gl->GenBuffers (1, &overlay->vbo_indices);
gl->BindBuffer (GL_ELEMENT_ARRAY_BUFFER, overlay->vbo_indices);
gl->BufferData (GL_ELEMENT_ARRAY_BUFFER, sizeof (indices), indices,
GL_STATIC_DRAW);
gl->GenBuffers (1, &overlay->overlay_vbo);
gl->BindBuffer (GL_ARRAY_BUFFER, overlay->overlay_vbo);
gl->BindBuffer (GL_ELEMENT_ARRAY_BUFFER, overlay->vbo_indices);
overlay->geometry_change = TRUE;
}
if (gl->GenVertexArrays) {
gl->BindVertexArray (overlay->overlay_vao);
}
if (overlay->geometry_change) {
gint render_width, render_height;
gfloat x, y, image_width, image_height;
/* *INDENT-OFF* */
float vertices[] = {
-1.0f, -1.0f, 0.0f, 0.0f, 0.0f,
1.0f, -1.0f, 0.0f, 1.0f, 0.0f,
1.0f, 1.0f, 0.0f, 1.0f, 1.0f,
-1.0f, 1.0f, 0.0f, 0.0, 1.0f,
};
/* *INDENT-ON* */
/* scale from [0, 1] -> [-1, 1] */
x = ((gfloat) overlay->offset_x / (gfloat) overlay->window_width +
overlay->relative_x) * 2.0f - 1.0;
y = ((gfloat) overlay->offset_y / (gfloat) overlay->window_height +
overlay->relative_y) * 2.0f - 1.0;
/* scale from [0, 1] -> [0, 2] */
render_width =
overlay->overlay_width >
0 ? overlay->overlay_width : overlay->image_width;
render_height =
overlay->overlay_height >
0 ? overlay->overlay_height : overlay->image_height;
image_width =
((gfloat) render_width / (gfloat) overlay->window_width) * 2.0f;
image_height =
((gfloat) render_height / (gfloat) overlay->window_height) * 2.0f;
vertices[0] = vertices[15] = x;
vertices[5] = vertices[10] = x + image_width;
vertices[1] = vertices[6] = y;
vertices[11] = vertices[16] = y + image_height;
gl->BufferData (GL_ARRAY_BUFFER, 4 * 5 * sizeof (GLfloat), vertices,
GL_STATIC_DRAW);
}
_bind_buffer (overlay, overlay->overlay_vbo);
gl->BindTexture (GL_TEXTURE_2D, image_tex);
gst_gl_shader_set_uniform_1f (overlay->shader, "alpha", overlay->alpha);
gl->Enable (GL_BLEND);
gl->BlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
gl->BlendEquation (GL_FUNC_ADD);
gl->DrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0);
gl->Disable (GL_BLEND);
ret = TRUE;
out:
if (gl->GenVertexArrays)
gl->BindVertexArray (0);
_unbind_buffer (overlay);
gst_gl_context_clear_shader (GST_GL_BASE_FILTER (filter)->context);
if (memory_mapped)
gst_memory_unmap ((GstMemory *) overlay->image_memory, &map_info);
overlay->geometry_change = FALSE;
return ret;
}
static gboolean
load_file (GstGLOverlay * overlay)
{
FILE *fp;
guint8 buff[16];
gsize n_read;
GstCaps *caps;
GstStructure *structure;
gboolean success = FALSE;
if (overlay->location == NULL)
return TRUE;
if ((fp = fopen (overlay->location, "rb")) == NULL) {
GST_ELEMENT_ERROR (overlay, RESOURCE, NOT_FOUND, ("Can't open file"),
("File: %s", overlay->location));
return FALSE;
}
n_read = fread (buff, 1, sizeof (buff), fp);
if (n_read != sizeof (buff)) {
GST_ELEMENT_ERROR (overlay, STREAM, DECODE, ("Can't read file header"),
("File: %s", overlay->location));
goto out;
}
caps = gst_type_find_helper_for_data (GST_OBJECT (overlay), buff,
sizeof (buff), NULL);
if (caps == NULL) {
GST_ELEMENT_ERROR (overlay, STREAM, DECODE, ("Can't find file type"),
("File: %s", overlay->location));
goto out;
}
fseek (fp, 0, SEEK_SET);
structure = gst_caps_get_structure (caps, 0);
if (gst_structure_has_name (structure, "image/jpeg")) {
success = gst_gl_overlay_load_jpeg (overlay, fp);
} else if (gst_structure_has_name (structure, "image/png")) {
success = gst_gl_overlay_load_png (overlay, fp);
} else {
GST_ELEMENT_ERROR (overlay, STREAM, DECODE, ("Image type not supported"),
("File: %s", overlay->location));
}
out:
fclose (fp);
gst_caps_replace (&caps, NULL);
return success;
}
static gboolean
gst_gl_overlay_filter_texture (GstGLFilter * filter, GstGLMemory * in_tex,
GstGLMemory * 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 (!load_file (overlay))
return FALSE;
overlay->location_has_changed = FALSE;
}
gst_gl_filter_render_to_target (filter, 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);
}
static gboolean
gst_gl_overlay_load_jpeg (GstGLOverlay * overlay, FILE * fp)
{
GstGLBaseMemoryAllocator *mem_allocator;
GstGLVideoAllocationParams *params;
GstVideoInfo v_info;
GstVideoAlignment v_align;
GstMapInfo map_info;
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr;
JSAMPROW j;
int i;
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);
gst_video_alignment_reset (&v_align);
v_align.stride_align[0] = 32 - 1;
gst_video_info_align (&v_info, &v_align);
mem_allocator =
GST_GL_BASE_MEMORY_ALLOCATOR (gst_gl_memory_allocator_get_default
(GST_GL_BASE_FILTER (overlay)->context));
params =
gst_gl_video_allocation_params_new (GST_GL_BASE_FILTER (overlay)->context,
NULL, &v_info, 0, &v_align, GST_GL_TEXTURE_TARGET_2D, GST_GL_RGBA);
overlay->image_memory = (GstGLMemory *)
gst_gl_base_memory_alloc (mem_allocator,
(GstGLAllocationParams *) params);
gst_gl_allocation_params_free ((GstGLAllocationParams *) params);
gst_object_unref (mem_allocator);
if (!gst_memory_map ((GstMemory *) overlay->image_memory, &map_info,
GST_MAP_WRITE)) {
GST_ELEMENT_ERROR (overlay, STREAM, DECODE, ("failed to map memory"),
("File: %s", overlay->location));
return FALSE;
}
for (i = 0; i < overlay->image_height; ++i) {
j = map_info.data + v_info.stride[0] * i;
jpeg_read_scanlines (&cinfo, &j, 1);
}
jpeg_finish_decompress (&cinfo);
jpeg_destroy_decompress (&cinfo);
gst_memory_unmap ((GstMemory *) overlay->image_memory, &map_info);
return TRUE;
}
static gboolean
gst_gl_overlay_load_png (GstGLOverlay * overlay, FILE * fp)
{
GstGLBaseMemoryAllocator *mem_allocator;
GstGLVideoAllocationParams *params;
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;
guint y = 0;
guchar **rows = NULL;
gint filler;
png_byte magic[8];
gint n_read;
if (!GST_GL_BASE_FILTER (overlay)->context)
return FALSE;
/* Read magic number */
n_read = fread (magic, 1, sizeof (magic), fp);
if (n_read != sizeof (magic)) {
GST_ELEMENT_ERROR (overlay, STREAM, DECODE,
("can't read PNG magic number"), ("File: %s", overlay->location));
return FALSE;
}
/* Check for valid magic number */
if (png_sig_cmp (magic, 0, sizeof (magic))) {
GST_ELEMENT_ERROR (overlay, STREAM, DECODE,
("not a valid PNG image"), ("File: %s", overlay->location));
return FALSE;
}
png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (png_ptr == NULL) {
GST_ELEMENT_ERROR (overlay, STREAM, DECODE,
("failed to initialize the png_struct"), ("File: %s",
overlay->location));
return FALSE;
}
png_set_error_fn (png_ptr, NULL, NULL, user_warning_fn);
info_ptr = png_create_info_struct (png_ptr);
if (info_ptr == NULL) {
png_destroy_read_struct (&png_ptr, png_infopp_NULL, png_infopp_NULL);
GST_ELEMENT_ERROR (overlay, STREAM, DECODE,
("failed to initialize the memory for image information"),
("File: %s", overlay->location));
return FALSE;
}
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) {
png_destroy_read_struct (&png_ptr, png_infopp_NULL, png_infopp_NULL);
GST_ELEMENT_ERROR (overlay, STREAM, DECODE,
("color type is not rgb"), ("File: %s", overlay->location));
return FALSE;
}
overlay->image_width = width;
overlay->image_height = height;
gst_video_info_set_format (&v_info, GST_VIDEO_FORMAT_RGBA, width, height);
mem_allocator =
GST_GL_BASE_MEMORY_ALLOCATOR (gst_gl_memory_allocator_get_default
(GST_GL_BASE_FILTER (overlay)->context));
params =
gst_gl_video_allocation_params_new (GST_GL_BASE_FILTER (overlay)->context,
NULL, &v_info, 0, NULL, GST_GL_TEXTURE_TARGET_2D, GST_GL_RGBA);
overlay->image_memory = (GstGLMemory *)
gst_gl_base_memory_alloc (mem_allocator,
(GstGLAllocationParams *) params);
gst_gl_allocation_params_free ((GstGLAllocationParams *) params);
gst_object_unref (mem_allocator);
if (!gst_memory_map ((GstMemory *) overlay->image_memory, &map_info,
GST_MAP_WRITE)) {
png_destroy_read_struct (&png_ptr, &info_ptr, png_infopp_NULL);
GST_ELEMENT_ERROR (overlay, STREAM, DECODE,
("failed to map memory"), ("File: %s", overlay->location));
return FALSE;
}
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);
return TRUE;
}