gstreamer/gst/overlay/gstoverlay.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) <2003> David Schleef <ds@schleef.org>
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstoverlay.h"
/* elementfactory information */
static GstElementDetails overlay_details = {
"Video Overlay",
"Filter/Video",
"LGPL",
"Overlay multiple video streams",
VERSION,
"David Schleef <ds@schleef.org>",
"(C) 2002, 2003",
};
GST_PAD_TEMPLATE_FACTORY (overlay_src_factory,
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"overlay_src",
"video/x-raw-yuv",
"format", GST_PROPS_FOURCC (GST_MAKE_FOURCC ('I','4','2','0')),
"width", GST_PROPS_INT_RANGE (1, G_MAXINT),
"height", GST_PROPS_INT_RANGE (1, G_MAXINT),
"framerate",GST_PROPS_FLOAT_RANGE (0, G_MAXFLOAT)
)
)
GST_PAD_TEMPLATE_FACTORY (overlay_sink1_factory,
"sink1",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"overlay_sink1",
"video/x-raw-yuv",
"format", GST_PROPS_FOURCC (GST_MAKE_FOURCC ('I','4','2','0')),
"width", GST_PROPS_INT_RANGE (1, G_MAXINT),
"height", GST_PROPS_INT_RANGE (1, G_MAXINT),
"framerate",GST_PROPS_FLOAT_RANGE (0, G_MAXFLOAT)
)
)
GST_PAD_TEMPLATE_FACTORY (overlay_sink2_factory,
"sink2",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"overlay_sink2",
"video/x-raw-yuv",
"format", GST_PROPS_FOURCC (GST_MAKE_FOURCC ('I','4','2','0')),
"width", GST_PROPS_INT_RANGE (1, G_MAXINT),
"height", GST_PROPS_INT_RANGE (1, G_MAXINT),
"framerate",GST_PROPS_FLOAT_RANGE (0, G_MAXFLOAT)
)
)
GST_PAD_TEMPLATE_FACTORY (overlay_sink3_factory,
"sink3",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"overlay_sink2",
"video/x-raw-yuv",
"format", GST_PROPS_FOURCC (GST_MAKE_FOURCC ('I','4','2','0')),
"width", GST_PROPS_INT_RANGE (1, G_MAXINT),
"height", GST_PROPS_INT_RANGE (1, G_MAXINT),
"framerate",GST_PROPS_FLOAT_RANGE (0, G_MAXFLOAT)
)
)
/* OVERLAY signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
};
static void gst_overlay_class_init (GstOverlayClass *klass);
static void gst_overlay_init (GstOverlay *overlay);
static void gst_overlay_loop (GstElement *element);
static void gst_overlay_set_property (GObject *object, guint prop_id,
const GValue *value, GParamSpec *pspec);
static void gst_overlay_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec);
static GstElementClass *parent_class = NULL;
/*static guint gst_overlay_signals[LAST_SIGNAL] = { 0 }; */
static GType
gst_overlay_get_type (void)
{
static GType overlay_type = 0;
if (!overlay_type) {
static const GTypeInfo overlay_info = {
sizeof(GstOverlayClass),
NULL,
NULL,
(GClassInitFunc)gst_overlay_class_init,
NULL,
NULL,
sizeof(GstOverlay),
0,
(GInstanceInitFunc)gst_overlay_init,
};
overlay_type = g_type_register_static(GST_TYPE_ELEMENT, "GstOverlay", &overlay_info, 0);
}
return overlay_type;
}
static void
gst_overlay_class_init (GstOverlayClass *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
gobject_class->set_property = gst_overlay_set_property;
gobject_class->get_property = gst_overlay_get_property;
}
#if 0
static GstCaps *gst_overlay_getcaps(GstPad *pad)
{
GstCaps *caps;
GstOverlay *overlay;
overlay = GST_OVERLAY (gst_pad_get_parent (pad));
if(overlay->width && overlay->height){
caps = GST_CAPS_NEW (
"overlay_sink2",
"video/raw",
"format", GST_PROPS_FOURCC (GST_MAKE_FOURCC ('I','4','2','0')),
"width", GST_PROPS_INT (overlay->width),
"height", GST_PROPS_INT (overlay->height)
);
}else{
caps = GST_CAPS_NEW (
"overlay_sink2",
"video/raw",
"format", GST_PROPS_FOURCC (GST_MAKE_FOURCC ('I','4','2','0')),
"width", GST_PROPS_INT_RANGE (0, 4096),
"height", GST_PROPS_INT_RANGE (0, 4096)
);
}
return caps;
}
#endif
static gboolean
gst_overlay_sinkconnect (GstPad *pad, GstCaps *caps)
{
GstOverlay *overlay;
overlay = GST_OVERLAY (gst_pad_get_parent (pad));
if (!GST_CAPS_IS_FIXED (caps))
return GST_PAD_LINK_DELAYED;
gst_caps_get_int (caps, "width", &overlay->width);
gst_caps_get_int (caps, "height", &overlay->height);
gst_caps_get_float (caps, "framerate", &overlay->framerate);
/* forward to the next plugin */
return gst_pad_try_set_caps(overlay->srcpad, gst_caps_copy_1(caps));
}
static void
gst_overlay_init (GstOverlay *overlay)
{
overlay->sinkpad1 = gst_pad_new_from_template (
GST_PAD_TEMPLATE_GET (overlay_sink1_factory), "sink1");
gst_pad_set_link_function (overlay->sinkpad1, gst_overlay_sinkconnect);
gst_element_add_pad (GST_ELEMENT (overlay), overlay->sinkpad1);
overlay->sinkpad2 = gst_pad_new_from_template (
GST_PAD_TEMPLATE_GET (overlay_sink2_factory), "sink2");
gst_pad_set_link_function (overlay->sinkpad2, gst_overlay_sinkconnect);
gst_element_add_pad (GST_ELEMENT (overlay), overlay->sinkpad2);
overlay->sinkpad3 = gst_pad_new_from_template (
GST_PAD_TEMPLATE_GET (overlay_sink3_factory), "sink3");
gst_pad_set_link_function (overlay->sinkpad3, gst_overlay_sinkconnect);
gst_element_add_pad (GST_ELEMENT (overlay), overlay->sinkpad3);
overlay->srcpad = gst_pad_new_from_template (
GST_PAD_TEMPLATE_GET (overlay_src_factory), "src");
gst_element_add_pad (GST_ELEMENT (overlay), overlay->srcpad);
gst_element_set_loop_function (GST_ELEMENT (overlay), gst_overlay_loop);
}
static void
gst_overlay_blend_i420 (guint8 *out, guint8 *in1, guint8 *in2, guint8 *in3,
gint width, gint height)
{
int mask;
int i, j;
guint8 *in1u, *in1v, *in2u, *in2v, *outu, *outv;
int lumsize;
int chromsize;
int width2 = width/2;
int height2 = height/2;
lumsize = width * height;
chromsize = width2 * height2;
in1u = in1 + lumsize; in1v = in1u + chromsize;
in2u = in2 + lumsize; in2v = in2u + chromsize;
outu = out + lumsize; outv = outu + chromsize;
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
mask = in3[i*width + j];
out[i*width+j] = ((in1[i*width+j] * mask) +
(in2[i*width+j] * (255 - mask))) >> 8;
}
}
for (i = 0; i < height/2; i++) {
for (j = 0; j < width/2; j++) {
mask = (in3[(i*2)*width + (j*2)] + in3[(i*2 + 1)*width + (j*2)] +
in3[(i*2)*width + (j*2 + 1)] + in3[(i*2 + 1)*width + (j*2 + 1)]) / 4;
outu[i*width2 + j] = ((in1u[i*width2+j] * mask) +
(in2u[i*width2 + j] * (255 - mask))) >> 8;
outv[i*width2 + j] = ((in1v[i*width2+j] * mask) +
(in2v[i*width2 + j] * (255 - mask))) >> 8;
}
}
}
static void
gst_overlay_loop (GstElement *element)
{
GstOverlay *overlay;
GstBuffer *out;
GstBuffer *in1 = NULL, *in2 = NULL, *in3 = NULL;
int size;
overlay = GST_OVERLAY (element);
in1 = gst_pad_pull (overlay->sinkpad1);
if (GST_IS_EVENT (in1)) {
gst_pad_push (overlay->srcpad, in1);
/* FIXME */
return;
}
in2 = gst_pad_pull (overlay->sinkpad2);
if (GST_IS_EVENT (in2)) {
gst_pad_push (overlay->srcpad, in2);
/* FIXME */
return;
}
in3 = gst_pad_pull (overlay->sinkpad3);
if (GST_IS_EVENT (in3)) {
gst_pad_push (overlay->srcpad, in3);
/* FIXME */
return;
}
g_return_if_fail(in1 != NULL);
g_return_if_fail(in2 != NULL);
g_return_if_fail(in3 != NULL);
size = (overlay->width * overlay->height * 3)/2;
g_return_if_fail(GST_BUFFER_SIZE(in1) != size);
g_return_if_fail(GST_BUFFER_SIZE(in2) != size);
g_return_if_fail(GST_BUFFER_SIZE(in3) != size);
out = gst_buffer_new_and_alloc (size);
if (!GST_PAD_CAPS (overlay->srcpad)) {
if (!gst_pad_try_set_caps (overlay->srcpad,
GST_CAPS_NEW (
"overlay_srccaps",
"video/x-raw-yuv",
"format", GST_PROPS_FOURCC (GST_MAKE_FOURCC ('I','4','2','0')),
"width", GST_PROPS_INT (overlay->width),
"height", GST_PROPS_INT (overlay->height),
"framerate",GST_PROPS_FLOAT (overlay->framerate)
)))
{
gst_element_error (element, "cannot set caps");
return;
}
}
gst_overlay_blend_i420 (GST_BUFFER_DATA (out),
GST_BUFFER_DATA (in1),
GST_BUFFER_DATA (in2),
GST_BUFFER_DATA (in3),
overlay->width, overlay->height);
GST_BUFFER_TIMESTAMP (out) = GST_BUFFER_TIMESTAMP (in1);
GST_BUFFER_DURATION (out) = GST_BUFFER_DURATION (in1);
gst_buffer_unref (in1);
gst_buffer_unref (in2);
gst_buffer_unref (in3);
gst_pad_push (overlay->srcpad, out);
}
static void
gst_overlay_set_property (GObject *object, guint prop_id,
const GValue *value, GParamSpec *pspec)
{
GstOverlay *overlay;
overlay = GST_OVERLAY(object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_overlay_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec)
{
GstOverlay *overlay;
overlay = GST_OVERLAY(object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
plugin_init (GModule *module, GstPlugin *plugin)
{
GstElementFactory *factory;
factory = gst_element_factory_new("overlay",GST_TYPE_OVERLAY,
&overlay_details);
g_return_val_if_fail(factory != NULL, FALSE);
gst_element_factory_add_pad_template (factory,
GST_PAD_TEMPLATE_GET (overlay_sink1_factory));
gst_element_factory_add_pad_template (factory,
GST_PAD_TEMPLATE_GET (overlay_sink2_factory));
gst_element_factory_add_pad_template (factory,
GST_PAD_TEMPLATE_GET (overlay_sink3_factory));
gst_element_factory_add_pad_template (factory,
GST_PAD_TEMPLATE_GET (overlay_src_factory));
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
return TRUE;
}
GstPluginDesc plugin_desc = {
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"overlay",
plugin_init
};