gstreamer/gst/alpha/gstalphacolor.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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 <gst/gst.h>
#include <gst/base/gstbasetransform.h>
#include <gst/video/video.h>
#include <string.h>
GST_DEBUG_CATEGORY (alpha_color_debug);
#define GST_CAT_DEFAULT alpha_color_debug
#define GST_TYPE_ALPHA_COLOR \
(gst_alpha_color_get_type())
#define GST_ALPHA_COLOR(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ALPHA_COLOR,GstAlphaColor))
#define GST_ALPHA_COLOR_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ALPHA_COLOR,GstAlphaColorClass))
#define GST_IS_ALPHA_COLOR(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ALPHA_COLOR))
#define GST_IS_ALPHA_COLOR_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ALPHA_COLOR))
typedef struct _GstAlphaColor GstAlphaColor;
typedef struct _GstAlphaColorClass GstAlphaColorClass;
struct _GstAlphaColor
{
GstBaseTransform element;
/* caps */
gint in_width, in_height;
gboolean in_rgba;
gint out_width, out_height;
};
struct _GstAlphaColorClass
{
GstBaseTransformClass parent_class;
};
/* elementfactory information */
static GstElementDetails gst_alpha_color_details =
GST_ELEMENT_DETAILS ("alpha color filter",
"Filter/Effect/Video",
"RGB->YUV colorspace conversion preserving the alpha channels",
"Wim Taymans <wim@fluendo.com>");
static GstStaticPadTemplate gst_alpha_color_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_RGBA ";" GST_VIDEO_CAPS_BGRA)
);
static GstStaticPadTemplate gst_alpha_color_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("AYUV"))
);
GST_BOILERPLATE (GstAlphaColor, gst_alpha_color, GstBaseTransform,
GST_TYPE_BASE_TRANSFORM);
static GstCaps *gst_alpha_color_transform_caps (GstBaseTransform * btrans,
GstPadDirection direction, GstCaps * caps);
static gboolean gst_alpha_color_set_caps (GstBaseTransform * btrans,
GstCaps * incaps, GstCaps * outcaps);
static GstFlowReturn gst_alpha_color_transform_ip (GstBaseTransform * btrans,
GstBuffer * inbuf);
static void
gst_alpha_color_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (element_class, &gst_alpha_color_details);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_alpha_color_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_alpha_color_src_template));
}
static void
gst_alpha_color_class_init (GstAlphaColorClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstBaseTransformClass *gstbasetransform_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstbasetransform_class = (GstBaseTransformClass *) klass;
gstbasetransform_class->transform_caps =
GST_DEBUG_FUNCPTR (gst_alpha_color_transform_caps);
gstbasetransform_class->set_caps =
GST_DEBUG_FUNCPTR (gst_alpha_color_set_caps);
gstbasetransform_class->transform_ip =
GST_DEBUG_FUNCPTR (gst_alpha_color_transform_ip);
GST_DEBUG_CATEGORY_INIT (alpha_color_debug, "alphacolor", 0,
"RGB->YUV colorspace conversion preserving the alpha channels");
}
static void
gst_alpha_color_init (GstAlphaColor * alpha, GstAlphaColorClass * g_class)
{
GstBaseTransform *btrans = NULL;
btrans = GST_BASE_TRANSFORM (alpha);
btrans->always_in_place = TRUE;
}
static GstCaps *
gst_alpha_color_transform_caps (GstBaseTransform * btrans,
GstPadDirection direction, GstCaps * caps)
{
GstAlphaColor *alpha = NULL;
GstCaps *result = NULL, *local_caps = NULL;
GstPadTemplate *tmpl = NULL;
guint i;
alpha = GST_ALPHA_COLOR (btrans);
local_caps = gst_caps_copy (caps);
for (i = 0; i < gst_caps_get_size (local_caps); i++) {
GstStructure *structure = gst_caps_get_structure (local_caps, i);
/* Throw away the structure name and set it to transformed format */
if (direction == GST_PAD_SINK) {
gst_structure_set_name (structure, "video/x-raw-yuv");
} else if (direction == GST_PAD_SRC) {
gst_structure_set_name (structure, "video/x-raw-rgb");
}
/* Remove any specific parameter from the structure */
gst_structure_remove_field (structure, "format");
gst_structure_remove_field (structure, "endianness");
gst_structure_remove_field (structure, "depth");
gst_structure_remove_field (structure, "bpp");
gst_structure_remove_field (structure, "red_mask");
gst_structure_remove_field (structure, "green_mask");
gst_structure_remove_field (structure, "blue_mask");
gst_structure_remove_field (structure, "alpha_mask");
}
/* Get the appropriate template */
if (direction == GST_PAD_SINK) {
tmpl = gst_static_pad_template_get (&gst_alpha_color_src_template);
} else if (direction == GST_PAD_SRC) {
tmpl = gst_static_pad_template_get (&gst_alpha_color_sink_template);
}
/* Intersect with our template caps */
result = gst_caps_intersect (local_caps, gst_pad_template_get_caps (tmpl));
gst_caps_unref (local_caps);
gst_caps_do_simplify (result);
GST_LOG ("transformed %s to %s", gst_caps_to_string (caps),
gst_caps_to_string (result));
return result;
}
static gboolean
gst_alpha_color_set_caps (GstBaseTransform * btrans, GstCaps * incaps,
GstCaps * outcaps)
{
GstAlphaColor *alpha;
GstStructure *structure;
gboolean ret;
const GValue *fps;
gint red_mask;
alpha = GST_ALPHA_COLOR (btrans);
structure = gst_caps_get_structure (incaps, 0);
ret = gst_structure_get_int (structure, "width", &alpha->in_width);
ret &= gst_structure_get_int (structure, "height", &alpha->in_height);
fps = gst_structure_get_value (structure, "framerate");
ret &= (fps != NULL && GST_VALUE_HOLDS_FRACTION (fps));
ret &= gst_structure_get_int (structure, "red_mask", &red_mask);
if (!ret)
return FALSE;
alpha->in_rgba = TRUE;
#if (G_BYTE_ORDER == G_BIG_ENDIAN)
if (red_mask != 0x000000ff)
#else
if (red_mask != 0x00ff0000)
#endif
alpha->in_rgba = FALSE;
return TRUE;
}
static void
transform_rgb (guint8 * data, gint size)
{
guint8 y, u, v;
while (size > 0) {
y = data[0] * 0.299 + data[1] * 0.587 + data[2] * 0.114 + 0;
u = data[0] * -0.169 + data[1] * -0.332 + data[2] * 0.500 + 128;
v = data[0] * 0.500 + data[1] * -0.419 + data[2] * -0.0813 + 128;
data[0] = data[3];
data[1] = y;
data[2] = u;
data[3] = v;
data += 4;
size -= 4;
}
}
static void
transform_bgr (guint8 * data, gint size)
{
guint8 y, u, v;
while (size > 0) {
y = data[2] * 0.299 + data[1] * 0.587 + data[0] * 0.114 + 0;
u = data[2] * -0.169 + data[1] * -0.332 + data[0] * 0.500 + 128;
v = data[2] * 0.500 + data[1] * -0.419 + data[0] * -0.0813 + 128;
data[0] = data[3];
data[1] = y;
data[2] = u;
data[3] = v;
data += 4;
size -= 4;
}
}
static GstFlowReturn
gst_alpha_color_transform_ip (GstBaseTransform * btrans, GstBuffer * inbuf)
{
GstFlowReturn ret = GST_FLOW_OK;
GstAlphaColor *alpha;
alpha = GST_ALPHA_COLOR (btrans);
/* Transform in place */
if (alpha->in_rgba)
transform_rgb (GST_BUFFER_DATA (inbuf), GST_BUFFER_SIZE (inbuf));
else
transform_bgr (GST_BUFFER_DATA (inbuf), GST_BUFFER_SIZE (inbuf));
return ret;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "alphacolor", GST_RANK_NONE,
GST_TYPE_ALPHA_COLOR);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"alphacolor",
"RGB->YUV colorspace conversion preserving the alpha channels",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)