gstreamer/ext/gdk_pixbuf/pixbufscale.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) <2004> Jan Schmidt <thaytan@mad.scientist.com>
* Copyright (C) <2004> Tim-Philipp Mueller <t.i.m@orange.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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <pixbufscale.h>
#include <gst/video/video.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#define ROUND_UP_2(x) (((x)+1)&~1)
#define ROUND_UP_4(x) (((x)+3)&~3)
#define ROUND_UP_8(x) (((x)+7)&~7)
/* These match the ones gstffmpegcolorspace uses (Tim) */
#define GST_RGB24_ROWSTRIDE(width) (ROUND_UP_4 ((width)*3))
#define GST_RGB24_SIZE(width,height) ((height)*GST_RGB24_ROWSTRIDE(width))
GST_DEBUG_CATEGORY_STATIC (pixbufscale_debug);
#define GST_CAT_DEFAULT pixbufscale_debug
/* GstPixbufScale signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_METHOD
/* FILL ME */
};
static GstStaticPadTemplate gst_pixbufscale_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB)
);
static GstStaticPadTemplate gst_pixbufscale_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB)
);
#define GST_TYPE_PIXBUFSCALE_METHOD (gst_pixbufscale_method_get_type())
static GType
gst_pixbufscale_method_get_type (void)
{
static GType pixbufscale_method_type = 0;
static const GEnumValue pixbufscale_methods[] = {
{GST_PIXBUFSCALE_NEAREST, "0", "Nearest Neighbour"},
{GST_PIXBUFSCALE_TILES, "1", "Tiles"},
{GST_PIXBUFSCALE_BILINEAR, "2", "Bilinear"},
{GST_PIXBUFSCALE_HYPER, "3", "Hyper"},
{0, NULL, NULL},
};
if (!pixbufscale_method_type) {
pixbufscale_method_type =
g_enum_register_static ("GstPixbufScaleMethod", pixbufscale_methods);
}
return pixbufscale_method_type;
}
static void gst_pixbufscale_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_pixbufscale_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstCaps *gst_pixbufscale_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps);
static gboolean gst_pixbufscale_set_caps (GstBaseTransform * trans,
GstCaps * in, GstCaps * out);
static gboolean gst_pixbufscale_get_unit_size (GstBaseTransform * trans,
GstCaps * caps, guint * size);
static void gst_pixbufscale_fixate_caps (GstBaseTransform * base,
GstPadDirection direction, GstCaps * caps, GstCaps * othercaps);
static GstFlowReturn gst_pixbufscale_transform (GstBaseTransform * trans,
GstBuffer * in, GstBuffer * out);
static gboolean gst_pixbufscale_handle_src_event (GstPad * pad,
GstEvent * event);
static gboolean parse_caps (GstCaps * caps, gint * width, gint * height);
GST_BOILERPLATE (GstPixbufScale, gst_pixbufscale, GstBaseTransform,
GST_TYPE_BASE_TRANSFORM);
static void
gst_pixbufscale_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details_simple (element_class, "GdkPixbuf image scaler",
"Filter/Effect/Video", "Resizes video",
"Jan Schmidt <thaytan@mad.scientist.com>, "
"Wim Taymans <wim.taymans@chello.be>, "
"Renato Filho <renato.filho@indt.org.br>");
gst_element_class_add_static_pad_template (element_class,
&gst_pixbufscale_src_template);
gst_element_class_add_static_pad_template (element_class,
&gst_pixbufscale_sink_template);
}
static void
gst_pixbufscale_class_init (GstPixbufScaleClass * klass)
{
GObjectClass *gobject_class;
GstBaseTransformClass *trans_class;
gobject_class = (GObjectClass *) klass;
trans_class = (GstBaseTransformClass *) klass;
gobject_class->set_property = gst_pixbufscale_set_property;
gobject_class->get_property = gst_pixbufscale_get_property;
g_object_class_install_property (gobject_class,
ARG_METHOD,
g_param_spec_enum ("method", "method", "method",
GST_TYPE_PIXBUFSCALE_METHOD, GST_PIXBUFSCALE_BILINEAR,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
trans_class->transform_caps =
GST_DEBUG_FUNCPTR (gst_pixbufscale_transform_caps);
trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_pixbufscale_set_caps);
trans_class->get_unit_size =
GST_DEBUG_FUNCPTR (gst_pixbufscale_get_unit_size);
trans_class->transform = GST_DEBUG_FUNCPTR (gst_pixbufscale_transform);
trans_class->fixate_caps = GST_DEBUG_FUNCPTR (gst_pixbufscale_fixate_caps);
trans_class->passthrough_on_same_caps = TRUE;
parent_class = g_type_class_peek_parent (klass);
}
static void
gst_pixbufscale_init (GstPixbufScale * pixbufscale,
GstPixbufScaleClass * kclass)
{
GstBaseTransform *trans;
GST_DEBUG_OBJECT (pixbufscale, "_init");
trans = GST_BASE_TRANSFORM (pixbufscale);
gst_pad_set_event_function (trans->srcpad, gst_pixbufscale_handle_src_event);
pixbufscale->method = GST_PIXBUFSCALE_TILES;
pixbufscale->gdk_method = GDK_INTERP_TILES;
}
static void
gst_pixbufscale_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstPixbufScale *src;
g_return_if_fail (GST_IS_PIXBUFSCALE (object));
src = GST_PIXBUFSCALE (object);
switch (prop_id) {
case ARG_METHOD:
src->method = g_value_get_enum (value);
switch (src->method) {
case GST_PIXBUFSCALE_NEAREST:
src->gdk_method = GDK_INTERP_NEAREST;
break;
case GST_PIXBUFSCALE_TILES:
src->gdk_method = GDK_INTERP_TILES;
break;
case GST_PIXBUFSCALE_BILINEAR:
src->gdk_method = GDK_INTERP_BILINEAR;
break;
case GST_PIXBUFSCALE_HYPER:
src->gdk_method = GDK_INTERP_HYPER;
break;
}
break;
default:
break;
}
}
static void
gst_pixbufscale_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstPixbufScale *src;
g_return_if_fail (GST_IS_PIXBUFSCALE (object));
src = GST_PIXBUFSCALE (object);
switch (prop_id) {
case ARG_METHOD:
g_value_set_enum (value, src->method);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstCaps *
gst_pixbufscale_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps)
{
GstCaps *ret;
int i;
ret = gst_caps_copy (caps);
for (i = 0; i < gst_caps_get_size (ret); i++) {
GstStructure *structure = gst_caps_get_structure (ret, i);
gst_structure_set (structure,
"width", GST_TYPE_INT_RANGE, 16, 4096,
"height", GST_TYPE_INT_RANGE, 16, 4096, NULL);
gst_structure_remove_field (structure, "pixel-aspect-ratio");
}
GST_DEBUG_OBJECT (trans, "returning caps: %" GST_PTR_FORMAT, ret);
return ret;
}
static gboolean
parse_caps (GstCaps * caps, gint * width, gint * height)
{
gboolean ret;
GstStructure *structure;
structure = gst_caps_get_structure (caps, 0);
ret = gst_structure_get_int (structure, "width", width);
ret &= gst_structure_get_int (structure, "height", height);
return ret;
}
static gboolean
gst_pixbufscale_set_caps (GstBaseTransform * trans, GstCaps * in, GstCaps * out)
{
GstPixbufScale *pixbufscale;
gboolean ret;
pixbufscale = GST_PIXBUFSCALE (trans);
ret = parse_caps (in, &pixbufscale->from_width, &pixbufscale->from_height);
ret &= parse_caps (out, &pixbufscale->to_width, &pixbufscale->to_height);
if (!ret)
goto done;
pixbufscale->from_stride = GST_ROUND_UP_4 (pixbufscale->from_width * 3);
pixbufscale->from_buf_size =
pixbufscale->from_stride * pixbufscale->from_height;
pixbufscale->to_stride = GST_ROUND_UP_4 (pixbufscale->to_width * 3);
pixbufscale->to_buf_size = pixbufscale->to_stride * pixbufscale->to_height;
GST_DEBUG_OBJECT (pixbufscale, "from=%dx%d, size %d -> to=%dx%d, size %d",
pixbufscale->from_width, pixbufscale->from_height,
pixbufscale->from_buf_size, pixbufscale->to_width, pixbufscale->to_height,
pixbufscale->to_buf_size);
done:
return ret;
}
static gboolean
gst_pixbufscale_get_unit_size (GstBaseTransform * trans,
GstCaps * caps, guint * size)
{
gint width, height;
g_assert (size);
if (!parse_caps (caps, &width, &height))
return FALSE;
*size = GST_ROUND_UP_4 (width * 3) * height;
return TRUE;
}
static void
gst_pixbufscale_fixate_caps (GstBaseTransform * base, GstPadDirection direction,
GstCaps * caps, GstCaps * othercaps)
{
GstStructure *ins, *outs;
const GValue *from_par, *to_par;
g_return_if_fail (gst_caps_is_fixed (caps));
GST_DEBUG_OBJECT (base, "trying to fixate othercaps %" GST_PTR_FORMAT
" based on caps %" GST_PTR_FORMAT, othercaps, caps);
ins = gst_caps_get_structure (caps, 0);
outs = gst_caps_get_structure (othercaps, 0);
from_par = gst_structure_get_value (ins, "pixel-aspect-ratio");
to_par = gst_structure_get_value (outs, "pixel-aspect-ratio");
if (from_par && to_par) {
GValue to_ratio = { 0, }; /* w/h of output video */
int from_w, from_h, from_par_n, from_par_d, to_par_n, to_par_d;
int count = 0, w = 0, h = 0, num, den;
/* if both width and height are already fixed, we can't do anything
* * about it anymore */
if (gst_structure_get_int (outs, "width", &w))
++count;
if (gst_structure_get_int (outs, "height", &h))
++count;
if (count == 2) {
GST_DEBUG_OBJECT (base, "dimensions already set to %dx%d, not fixating",
w, h);
return;
}
gst_structure_get_int (ins, "width", &from_w);
gst_structure_get_int (ins, "height", &from_h);
from_par_n = gst_value_get_fraction_numerator (from_par);
from_par_d = gst_value_get_fraction_denominator (from_par);
to_par_n = gst_value_get_fraction_numerator (to_par);
to_par_d = gst_value_get_fraction_denominator (to_par);
g_value_init (&to_ratio, GST_TYPE_FRACTION);
gst_value_set_fraction (&to_ratio, from_w * from_par_n * to_par_d,
from_h * from_par_d * to_par_n);
num = gst_value_get_fraction_numerator (&to_ratio);
den = gst_value_get_fraction_denominator (&to_ratio);
GST_DEBUG_OBJECT (base,
"scaling input with %dx%d and PAR %d/%d to output PAR %d/%d",
from_w, from_h, from_par_n, from_par_d, to_par_n, to_par_d);
GST_DEBUG_OBJECT (base,
"resulting output should respect ratio of %d/%d", num, den);
/* now find a width x height that respects this display ratio.
* * prefer those that have one of w/h the same as the incoming video
* * using wd / hd = num / den */
/* start with same height, because of interlaced video */
/* check hd / den is an integer scale factor, and scale wd with the PAR */
if (from_h % den == 0) {
GST_DEBUG_OBJECT (base, "keeping video height");
h = from_h;
w = h * num / den;
} else if (from_w % num == 0) {
GST_DEBUG_OBJECT (base, "keeping video width");
w = from_w;
h = w * den / num;
} else {
GST_DEBUG_OBJECT (base, "approximating but keeping video height");
h = from_h;
w = h * num / den;
}
GST_DEBUG_OBJECT (base, "scaling to %dx%d", w, h);
/* now fixate */
gst_structure_fixate_field_nearest_int (outs, "width", w);
gst_structure_fixate_field_nearest_int (outs, "height", h);
} else {
gint width, height;
if (gst_structure_get_int (ins, "width", &width)) {
if (gst_structure_has_field (outs, "width")) {
gst_structure_fixate_field_nearest_int (outs, "width", width);
}
}
if (gst_structure_get_int (ins, "height", &height)) {
if (gst_structure_has_field (outs, "height")) {
gst_structure_fixate_field_nearest_int (outs, "height", height);
}
}
}
GST_DEBUG_OBJECT (base, "fixated othercaps to %" GST_PTR_FORMAT, othercaps);
}
static GstFlowReturn
gst_pixbufscale_transform (GstBaseTransform * trans,
GstBuffer * in, GstBuffer * out)
{
GstPixbufScale *scale;
GdkPixbuf *src_pixbuf, *dest_pixbuf;
scale = GST_PIXBUFSCALE (trans);
src_pixbuf =
gdk_pixbuf_new_from_data (GST_BUFFER_DATA (in), GDK_COLORSPACE_RGB, FALSE,
8, scale->from_width, scale->from_height,
GST_RGB24_ROWSTRIDE (scale->from_width), NULL, NULL);
dest_pixbuf =
gdk_pixbuf_new_from_data (GST_BUFFER_DATA (out), GDK_COLORSPACE_RGB,
FALSE, 8, scale->to_width, scale->to_height,
GST_RGB24_ROWSTRIDE (scale->to_width), NULL, NULL);
gdk_pixbuf_scale (src_pixbuf, dest_pixbuf, 0, 0,
scale->to_width,
scale->to_height, 0, 0,
(double) scale->to_width / scale->from_width,
(double) scale->to_height / scale->from_height, scale->gdk_method);
g_object_unref (src_pixbuf);
g_object_unref (dest_pixbuf);
return GST_FLOW_OK;
}
static gboolean
gst_pixbufscale_handle_src_event (GstPad * pad, GstEvent * event)
{
GstPixbufScale *pixbufscale;
gboolean ret;
double a;
GstStructure *structure;
pixbufscale = GST_PIXBUFSCALE (gst_pad_get_parent (pad));
GST_DEBUG_OBJECT (pixbufscale, "handling %s event",
GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NAVIGATION:
event =
GST_EVENT (gst_mini_object_make_writable (GST_MINI_OBJECT (event)));
structure = (GstStructure *) gst_event_get_structure (event);
if (gst_structure_get_double (structure, "pointer_x", &a)) {
gst_structure_set (structure, "pointer_x", G_TYPE_DOUBLE,
a * pixbufscale->from_width / pixbufscale->to_width, NULL);
}
if (gst_structure_get_double (structure, "pointer_y", &a)) {
gst_structure_set (structure, "pointer_y", G_TYPE_DOUBLE,
a * pixbufscale->from_height / pixbufscale->to_height, NULL);
}
break;
default:
break;
}
ret = gst_pad_event_default (pad, event);
gst_object_unref (pixbufscale);
return ret;
}
gboolean
pixbufscale_init (GstPlugin * plugin)
{
if (!gst_element_register (plugin, "gdkpixbufscale", GST_RANK_NONE,
GST_TYPE_PIXBUFSCALE))
return FALSE;
GST_DEBUG_CATEGORY_INIT (pixbufscale_debug, "gdkpixbufscale", 0,
"pixbufscale element");
return TRUE;
}