gstreamer/ext/gdk_pixbuf/gstgdkpixbufoverlay.c

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/* GStreamer GdkPixbuf overlay
* Copyright (C) 2012 Tim-Philipp Müller <tim centricular net>
*
* 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 Street, Suite 500,
* Boston, MA 02110-1335, USA.
*/
/**
* SECTION:element-gdkpixbufoverlay
* @see_also:
*
* The gdkpixbufoverlay element overlays an image loaded from file onto
* a video stream.
*
* Changing the positioning or overlay width and height properties at runtime
* is supported, but it might be prudent to to protect the property setting
* code with GST_BASE_TRANSFORM_LOCK and GST_BASE_TRANSFORM_UNLOCK, as
* g_object_set() is not atomic for multiple properties passed in one go.
*
* Changing the image at runtime is currently not supported.
*
* Negative offsets are also not yet supported.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v videotestsrc ! gdkpixbufoverlay location=image.png ! autovideosink
* ]|
* Overlays the image in image.png onto the test video picture produced by
* videotestsrc.
* </refsect2>
*
* Since: 0.10.33
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include "gstgdkpixbufoverlay.h"
GST_DEBUG_CATEGORY_STATIC (gdkpixbufoverlay_debug);
#define GST_CAT_DEFAULT gdkpixbufoverlay_debug
static void gst_gdk_pixbuf_overlay_set_property (GObject * object,
guint property_id, const GValue * value, GParamSpec * pspec);
static void gst_gdk_pixbuf_overlay_get_property (GObject * object,
guint property_id, GValue * value, GParamSpec * pspec);
static void gst_gdk_pixbuf_overlay_finalize (GObject * object);
static gboolean gst_gdk_pixbuf_overlay_start (GstBaseTransform * trans);
static gboolean gst_gdk_pixbuf_overlay_stop (GstBaseTransform * trans);
static GstFlowReturn
gst_gdk_pixbuf_overlay_transform_ip (GstBaseTransform * trans, GstBuffer * buf);
static void gst_gdk_pixbuf_overlay_before_transform (GstBaseTransform * trans,
GstBuffer * outbuf);
static gboolean
gst_gdk_pixbuf_overlay_set_caps (GstBaseTransform * trans, GstCaps * incaps,
GstCaps * outcaps);
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
};
#define VIDEO_CAPS \
GST_VIDEO_CAPS_BGRx ";" \
GST_VIDEO_CAPS_RGB ";" \
GST_VIDEO_CAPS_BGR ";" \
GST_VIDEO_CAPS_RGBx ";" \
GST_VIDEO_CAPS_xRGB ";" \
GST_VIDEO_CAPS_xBGR ";" \
GST_VIDEO_CAPS_RGBA ";" \
GST_VIDEO_CAPS_BGRA ";" \
GST_VIDEO_CAPS_ARGB ";" \
GST_VIDEO_CAPS_ABGR ";" \
GST_VIDEO_CAPS_YUV ("{I420, YV12, AYUV, YUY2, UYVY, v308, v210," \
" v216, Y41B, Y42B, Y444, Y800, Y16, NV12, NV21, UYVP, A420," \
" YUV9, IYU1}")
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (VIDEO_CAPS)
);
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (VIDEO_CAPS)
);
GST_BOILERPLATE (GstGdkPixbufOverlay, gst_gdk_pixbuf_overlay,
GstVideoFilter, GST_TYPE_VIDEO_FILTER);
static void
gst_gdk_pixbuf_overlay_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_static_pad_template (element_class, &sink_template);
gst_element_class_add_static_pad_template (element_class, &src_template);
gst_element_class_set_static_metadata (element_class,
"GdkPixbuf Overlay", "Filter/Effect/Video",
"Overlay an image onto a video stream",
"Tim-Philipp Müller <tim centricular net>");
}
static void
gst_gdk_pixbuf_overlay_class_init (GstGdkPixbufOverlayClass * klass)
{
GstBaseTransformClass *basetrans_class = GST_BASE_TRANSFORM_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->set_property = gst_gdk_pixbuf_overlay_set_property;
gobject_class->get_property = gst_gdk_pixbuf_overlay_get_property;
gobject_class->finalize = gst_gdk_pixbuf_overlay_finalize;
basetrans_class->start = GST_DEBUG_FUNCPTR (gst_gdk_pixbuf_overlay_start);
basetrans_class->stop = GST_DEBUG_FUNCPTR (gst_gdk_pixbuf_overlay_stop);
basetrans_class->set_caps =
GST_DEBUG_FUNCPTR (gst_gdk_pixbuf_overlay_set_caps);
basetrans_class->transform_ip =
GST_DEBUG_FUNCPTR (gst_gdk_pixbuf_overlay_transform_ip);
basetrans_class->before_transform =
GST_DEBUG_FUNCPTR (gst_gdk_pixbuf_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,
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",
"Horizontal offset of overlay image in pixels from top-left corner "
"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",
"Vertical offset of overlay image in pixels from top-left corner "
"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_DEBUG_CATEGORY_INIT (gdkpixbufoverlay_debug, "gdkpixbufoverlay", 0,
"debug category for gdkpixbufoverlay element");
}
static void
gst_gdk_pixbuf_overlay_init (GstGdkPixbufOverlay * overlay,
GstGdkPixbufOverlayClass * overlay_class)
{
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;
}
void
gst_gdk_pixbuf_overlay_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
GstGdkPixbufOverlay *overlay = GST_GDK_PIXBUF_OVERLAY (object);
GST_OBJECT_LOCK (overlay);
switch (property_id) {
case PROP_LOCATION:
g_free (overlay->location);
overlay->location = g_value_dup_string (value);
break;
case PROP_OFFSET_X:
overlay->offset_x = g_value_get_int (value);
overlay->update_composition = TRUE;
break;
case PROP_OFFSET_Y:
overlay->offset_y = g_value_get_int (value);
overlay->update_composition = TRUE;
break;
case PROP_RELATIVE_X:
overlay->relative_x = g_value_get_double (value);
overlay->update_composition = TRUE;
break;
case PROP_RELATIVE_Y:
overlay->relative_y = g_value_get_double (value);
overlay->update_composition = TRUE;
break;
case PROP_OVERLAY_WIDTH:
overlay->overlay_width = g_value_get_int (value);
overlay->update_composition = TRUE;
break;
case PROP_OVERLAY_HEIGHT:
overlay->overlay_height = g_value_get_int (value);
overlay->update_composition = TRUE;
break;
case PROP_ALPHA:
overlay->alpha = g_value_get_double (value);
overlay->update_composition = TRUE;
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
GST_OBJECT_UNLOCK (overlay);
}
void
gst_gdk_pixbuf_overlay_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
GstGdkPixbufOverlay *overlay = GST_GDK_PIXBUF_OVERLAY (object);
GST_OBJECT_LOCK (overlay);
switch (property_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, property_id, pspec);
break;
}
GST_OBJECT_UNLOCK (overlay);
}
void
gst_gdk_pixbuf_overlay_finalize (GObject * object)
{
GstGdkPixbufOverlay *overlay = GST_GDK_PIXBUF_OVERLAY (object);
g_free (overlay->location);
overlay->location = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_gdk_pixbuf_overlay_load_image (GstGdkPixbufOverlay * overlay, GError ** err)
{
GdkPixbuf *pixbuf;
guint8 *pixels, *p;
gint width, height, stride, w, h;
pixbuf = gdk_pixbuf_new_from_file (overlay->location, err);
if (pixbuf == NULL)
return FALSE;
if (!gdk_pixbuf_get_has_alpha (pixbuf)) {
GdkPixbuf *alpha_pixbuf;
/* FIXME: we could do this much more efficiently ourselves below, but
* we're lazy for now */
/* FIXME: perhaps expose substitute_color via properties */
alpha_pixbuf = gdk_pixbuf_add_alpha (pixbuf, FALSE, 0, 0, 0);
g_object_unref (pixbuf);
pixbuf = alpha_pixbuf;
}
width = gdk_pixbuf_get_width (pixbuf);
height = gdk_pixbuf_get_height (pixbuf);
stride = gdk_pixbuf_get_rowstride (pixbuf);
pixels = gdk_pixbuf_get_pixels (pixbuf);
/* the memory layout in GdkPixbuf is R-G-B-A, we want:
* - B-G-R-A on little-endian platforms
* - A-R-G-B on big-endian platforms
*/
for (h = 0; h < height; ++h) {
p = pixels + (h * stride);
for (w = 0; w < width; ++w) {
guint8 tmp;
/* R-G-B-A ==> B-G-R-A */
tmp = p[0];
p[0] = p[2];
p[2] = tmp;
if (G_BYTE_ORDER == G_BIG_ENDIAN) {
/* B-G-R-A ==> A-R-G-B */
/* we can probably assume sane alignment */
*((guint32 *) p) = GUINT32_SWAP_LE_BE (*((guint32 *) p));
}
p += 4;
}
}
overlay->pixels = gst_buffer_new ();
GST_BUFFER_DATA (overlay->pixels) = pixels;
/* assume we have row padding even for the last row */
GST_BUFFER_SIZE (overlay->pixels) = height * stride;
/* transfer ownership of pixbuf to buffer */
GST_BUFFER_MALLOCDATA (overlay->pixels) = (guint8 *) pixbuf;
GST_BUFFER_FREE_FUNC (overlay->pixels) = (GFreeFunc) g_object_unref;
overlay->pixels_width = width;
overlay->pixels_height = height;
overlay->pixels_stride = stride;
overlay->update_composition = TRUE;
GST_INFO_OBJECT (overlay, "Loaded image, %d x %d", width, height);
return TRUE;
}
static gboolean
gst_gdk_pixbuf_overlay_start (GstBaseTransform * trans)
{
GstGdkPixbufOverlay *overlay = GST_GDK_PIXBUF_OVERLAY (trans);
GError *err = NULL;
if (overlay->location != NULL) {
if (!gst_gdk_pixbuf_overlay_load_image (overlay, &err))
goto error_loading_image;
gst_base_transform_set_passthrough (trans, FALSE);
} else {
GST_WARNING_OBJECT (overlay, "no image location set, doing nothing");
gst_base_transform_set_passthrough (trans, TRUE);
}
return TRUE;
/* ERRORS */
error_loading_image:
{
GST_ELEMENT_ERROR (overlay, RESOURCE, OPEN_READ,
("Could not load overlay image."), ("%s", err->message));
g_error_free (err);
return FALSE;
}
}
static gboolean
gst_gdk_pixbuf_overlay_stop (GstBaseTransform * trans)
{
GstGdkPixbufOverlay *overlay = GST_GDK_PIXBUF_OVERLAY (trans);
if (overlay->comp) {
gst_video_overlay_composition_unref (overlay->comp);
overlay->comp = NULL;
}
gst_buffer_replace (&overlay->pixels, NULL);
return TRUE;
}
static gboolean
gst_gdk_pixbuf_overlay_set_caps (GstBaseTransform * trans, GstCaps * incaps,
GstCaps * outcaps)
{
GstGdkPixbufOverlay *overlay = GST_GDK_PIXBUF_OVERLAY (trans);
GstVideoFormat video_format;
int w, h;
if (!gst_video_format_parse_caps (incaps, &video_format, &w, &h))
return FALSE;
overlay->format = video_format;
overlay->width = w;
overlay->height = h;
return TRUE;
}
static void
gst_gdk_pixbuf_overlay_update_composition (GstGdkPixbufOverlay * overlay)
{
GstVideoOverlayComposition *comp;
GstVideoOverlayRectangle *rect;
gint x, y, width, height;
if (overlay->comp) {
gst_video_overlay_composition_unref (overlay->comp);
overlay->comp = NULL;
}
if (overlay->alpha == 0.0)
return;
x = overlay->offset_x + (overlay->relative_x * overlay->pixels_width);
y = overlay->offset_y + (overlay->relative_y * overlay->pixels_height);
/* FIXME: this should work, but seems to crash */
if (x < 0)
x = 0;
if (y < 0)
y = 0;
width = overlay->overlay_width;
if (width == 0)
width = overlay->pixels_width;
height = overlay->overlay_height;
if (height == 0)
height = overlay->pixels_height;
GST_DEBUG_OBJECT (overlay, "overlay image dimensions: %d x %d, alpha=%.2f",
overlay->pixels_width, overlay->pixels_height, overlay->alpha);
GST_DEBUG_OBJECT (overlay, "properties: x,y: %d,%d (%g%%,%g%%) - WxH: %dx%d",
overlay->offset_x, overlay->offset_y,
overlay->relative_x * 100.0, overlay->relative_y * 100.0,
overlay->overlay_height, overlay->overlay_width);
GST_DEBUG_OBJECT (overlay, "overlay rendered: %d x %d @ %d,%d (onto %d x %d)",
width, height, x, y, overlay->width, overlay->height);
rect = gst_video_overlay_rectangle_new_argb (overlay->pixels,
overlay->pixels_width, overlay->pixels_height, overlay->pixels_stride,
x, y, width, height, GST_VIDEO_OVERLAY_FORMAT_FLAG_NONE);
if (overlay->alpha != 1.0)
gst_video_overlay_rectangle_set_global_alpha (rect, overlay->alpha);
comp = gst_video_overlay_composition_new (rect);
gst_video_overlay_rectangle_unref (rect);
overlay->comp = comp;
}
static void
gst_gdk_pixbuf_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 (G_OBJECT (trans), stream_time);
}
static GstFlowReturn
gst_gdk_pixbuf_overlay_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
{
GstGdkPixbufOverlay *overlay = GST_GDK_PIXBUF_OVERLAY (trans);
GST_OBJECT_LOCK (overlay);
if (G_UNLIKELY (overlay->update_composition)) {
gst_gdk_pixbuf_overlay_update_composition (overlay);
overlay->update_composition = FALSE;
}
GST_OBJECT_UNLOCK (overlay);
if (overlay->comp != NULL)
gst_video_overlay_composition_blend (overlay->comp, buf);
return GST_FLOW_OK;
}