gstreamer/gst/videobox/gstvideobox.c
Wim Taymans 8b7c3ac223 A plugin to add an alpha channel to I420 video. Can optionally do chroma keying.
Original commit message from CVS:
* configure.ac:
* gst/alpha/Makefile.am:
* gst/alpha/gstalpha.c: (gst_alpha_method_get_type),
(gst_alpha_get_type), (gst_alpha_base_init),
(gst_alpha_class_init), (gst_alpha_init), (gst_alpha_set_property),
(gst_alpha_get_property), (gst_alpha_sink_link), (gst_alpha_add),
(gst_alpha_chroma_key), (gst_alpha_chain),
(gst_alpha_change_state), (plugin_init):
A plugin to add an alpha channel to I420 video. Can optionally do
chroma keying.
* gst/multipart/Makefile.am:
* gst/multipart/multipart.c: (plugin_init):
* gst/multipart/multipartdemux.c: (gst_multipart_demux_base_init),
(gst_multipart_demux_class_init), (gst_multipart_demux_init),
(gst_multipart_demux_finalize), (gst_multipart_demux_handle_event),
(gst_multipart_find_pad_by_mime), (gst_multipart_demux_chain),
(gst_multipart_demux_change_state),
(gst_multipart_demux_plugin_init):
* gst/multipart/multipartmux.c: (gst_multipart_mux_get_type),
(gst_multipart_mux_base_init), (gst_multipart_mux_class_init),
(gst_multipart_mux_get_sink_event_masks), (gst_multipart_mux_init),
(gst_multipart_mux_sinkconnect), (gst_multipart_mux_pad_link),
(gst_multipart_mux_pad_unlink),
(gst_multipart_mux_request_new_pad),
(gst_multipart_mux_handle_src_event),
(gst_multipart_mux_next_buffer), (gst_multipart_mux_compare_pads),
(gst_multipart_mux_queue_pads), (gst_multipart_mux_loop),
(gst_multipart_mux_get_property), (gst_multipart_mux_set_property),
(gst_multipart_mux_change_state), (gst_multipart_mux_plugin_init):
A Multipart demuxer/muxer. Not sure if it violates specs. Used to
send multipart jpeg images to a browser.
* gst/videobox/Makefile.am:
* gst/videobox/README:
* gst/videobox/gstvideobox.c: (gst_video_box_fill_get_type),
(gst_video_box_get_type), (gst_video_box_base_init),
(gst_video_box_class_init), (gst_video_box_init),
(gst_video_box_set_property), (gst_video_box_get_property),
(gst_video_box_sink_link), (gst_video_box_i420),
(gst_video_box_ayuv), (gst_video_box_chain),
(gst_video_box_change_state), (plugin_init):
Crops or adds borders around an image. can do alpha channel
borders as well.
* gst/videomixer/Makefile.am:
* gst/videomixer/README:
* gst/videomixer/videomixer.c: (gst_videomixer_pad_get_type),
(gst_videomixer_pad_base_init), (gst_videomixer_pad_class_init),
(gst_videomixer_pad_get_sink_event_masks),
(gst_videomixer_pad_get_property),
(gst_videomixer_pad_set_property),
(gst_videomixer_pad_sinkconnect), (gst_videomixer_pad_link),
(gst_videomixer_pad_unlink), (gst_videomixer_pad_init),
(gst_video_mixer_background_get_type), (gst_videomixer_get_type),
(gst_videomixer_base_init), (gst_videomixer_class_init),
(gst_videomixer_init), (gst_videomixer_request_new_pad),
(gst_videomixer_handle_src_event),
(gst_videomixer_blend_ayuv_i420), (gst_videomixer_fill_checker),
(gst_videomixer_fill_color), (gst_videomixer_fill_queues),
(gst_videomixer_blend_buffers), (gst_videomixer_update_queues),
(gst_videomixer_loop), (gst_videomixer_get_property),
(gst_videomixer_set_property), (gst_videomixer_change_state),
(plugin_init):
Generic video mixer plugin, can handle multiple inputs all with
different framerates and video sizes. Is fully alpha channel
aware.
2004-05-28 18:01:34 +00:00

734 lines
21 KiB
C

/* 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/video/video.h>
#include <string.h>
#define GST_TYPE_VIDEO_BOX \
(gst_video_box_get_type())
#define GST_VIDEO_BOX(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_VIDEO_BOX,GstVideoBox))
#define GST_VIDEO_BOX_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_VIDEO_BOX,GstVideoBoxClass))
#define GST_IS_VIDEO_BOX(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_VIDEO_BOX))
#define GST_IS_VIDEO_BOX_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_VIDEO_BOX))
typedef struct _GstVideoBox GstVideoBox;
typedef struct _GstVideoBoxClass GstVideoBoxClass;
typedef enum
{
VIDEO_BOX_FILL_BLACK,
VIDEO_BOX_FILL_GREEN,
VIDEO_BOX_FILL_BLUE,
}
GstVideoBoxFill;
struct _GstVideoBox
{
GstElement element;
/* pads */
GstPad *sinkpad;
GstPad *srcpad;
/* caps */
gint in_width, in_height;
gint out_width, out_height;
gint box_left, box_right, box_top, box_bottom;
gint border_left, border_right, border_top, border_bottom;
gint crop_left, crop_right, crop_top, crop_bottom;
gboolean use_alpha;
gdouble alpha;
gdouble border_alpha;
GstVideoBoxFill fill_type;
};
struct _GstVideoBoxClass
{
GstElementClass parent_class;
};
/* elementfactory information */
static GstElementDetails gst_video_box_details =
GST_ELEMENT_DETAILS ("video box filter",
"Filter/Effect/Video",
"Resizes a video by adding borders or cropping",
"Wim Taymans <wim@fluendo.com>");
/* VideoBox signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
#define DEFAULT_LEFT 0
#define DEFAULT_RIGHT 0
#define DEFAULT_TOP 0
#define DEFAULT_BOTTOM 0
#define DEFAULT_FILL_TYPE VIDEO_BOX_FILL_BLACK
#define DEFAULT_ALPHA 1.0
#define DEFAULT_BORDER_ALPHA 1.0
enum
{
ARG_0,
ARG_LEFT,
ARG_RIGHT,
ARG_TOP,
ARG_BOTTOM,
ARG_FILL_TYPE,
ARG_ALPHA,
ARG_BORDER_ALPHA,
/* FILL ME */
};
static GstStaticPadTemplate gst_video_box_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("{ I420, AYUV }"))
);
static GstStaticPadTemplate gst_video_box_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("I420"))
);
static void gst_video_box_base_init (gpointer g_class);
static void gst_video_box_class_init (GstVideoBoxClass * klass);
static void gst_video_box_init (GstVideoBox * video_box);
static void gst_video_box_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_video_box_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstPadLinkReturn
gst_video_box_sink_link (GstPad * pad, const GstCaps * caps);
static void gst_video_box_chain (GstPad * pad, GstData * _data);
static GstElementStateReturn gst_video_box_change_state (GstElement * element);
static GstElementClass *parent_class = NULL;
#define GST_TYPE_VIDEO_BOX_FILL (gst_video_box_fill_get_type())
static GType
gst_video_box_fill_get_type (void)
{
static GType video_box_fill_type = 0;
static GEnumValue video_box_fill[] = {
{VIDEO_BOX_FILL_BLACK, "0", "Black"},
{VIDEO_BOX_FILL_GREEN, "1", "Colorkey green"},
{VIDEO_BOX_FILL_BLUE, "2", "Colorkey blue"},
{0, NULL, NULL},
};
if (!video_box_fill_type) {
video_box_fill_type =
g_enum_register_static ("GstVideoBoxFill", video_box_fill);
}
return video_box_fill_type;
}
/* static guint gst_video_box_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_video_box_get_type (void)
{
static GType video_box_type = 0;
if (!video_box_type) {
static const GTypeInfo video_box_info = {
sizeof (GstVideoBoxClass),
gst_video_box_base_init,
NULL,
(GClassInitFunc) gst_video_box_class_init,
NULL,
NULL,
sizeof (GstVideoBox),
0,
(GInstanceInitFunc) gst_video_box_init,
};
video_box_type =
g_type_register_static (GST_TYPE_ELEMENT, "GstVideoBox",
&video_box_info, 0);
}
return video_box_type;
}
static void
gst_video_box_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (element_class, &gst_video_box_details);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_video_box_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_video_box_src_template));
}
static void
gst_video_box_class_init (GstVideoBoxClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_FILL_TYPE,
g_param_spec_enum ("fill", "Fill", "How to fill the borders",
GST_TYPE_VIDEO_BOX_FILL, DEFAULT_FILL_TYPE,
(GParamFlags) G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_LEFT,
g_param_spec_int ("left", "Left", "Pixels to box at left",
G_MININT, G_MAXINT, DEFAULT_LEFT, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_RIGHT,
g_param_spec_int ("right", "Right", "Pixels to box at right",
G_MININT, G_MAXINT, DEFAULT_RIGHT, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_TOP,
g_param_spec_int ("top", "Top", "Pixels to box at top",
G_MININT, G_MAXINT, DEFAULT_TOP, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BOTTOM,
g_param_spec_int ("bottom", "Bottom", "Pixels to box at bottom",
G_MININT, G_MAXINT, DEFAULT_BOTTOM, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_ALPHA,
g_param_spec_double ("alpha", "Alpha", "Alpha value picture",
0.0, 1.0, DEFAULT_ALPHA, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BORDER_ALPHA,
g_param_spec_double ("border_alpha", "Border Alpha",
"Alpha value of the border", 0.0, 1.0, DEFAULT_BORDER_ALPHA,
G_PARAM_READWRITE));
gobject_class->set_property = gst_video_box_set_property;
gobject_class->get_property = gst_video_box_get_property;
gstelement_class->change_state = gst_video_box_change_state;
}
static void
gst_video_box_init (GstVideoBox * video_box)
{
/* create the sink and src pads */
video_box->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&gst_video_box_sink_template), "sink");
gst_element_add_pad (GST_ELEMENT (video_box), video_box->sinkpad);
gst_pad_set_chain_function (video_box->sinkpad, gst_video_box_chain);
gst_pad_set_link_function (video_box->sinkpad, gst_video_box_sink_link);
video_box->srcpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&gst_video_box_src_template), "src");
gst_element_add_pad (GST_ELEMENT (video_box), video_box->srcpad);
video_box->box_right = DEFAULT_RIGHT;
video_box->box_left = DEFAULT_LEFT;
video_box->box_top = DEFAULT_TOP;
video_box->box_bottom = DEFAULT_BOTTOM;
video_box->fill_type = DEFAULT_FILL_TYPE;
video_box->alpha = DEFAULT_ALPHA;
video_box->border_alpha = DEFAULT_BORDER_ALPHA;
GST_FLAG_SET (video_box, GST_ELEMENT_EVENT_AWARE);
}
/* do we need this function? */
static void
gst_video_box_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstVideoBox *video_box;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_VIDEO_BOX (object));
video_box = GST_VIDEO_BOX (object);
switch (prop_id) {
case ARG_LEFT:
video_box->box_left = g_value_get_int (value);
if (video_box->box_left < 0) {
video_box->border_left = -video_box->box_left;
video_box->crop_left = 0;
} else {
video_box->border_left = 0;
video_box->crop_left = video_box->box_left;
}
break;
case ARG_RIGHT:
video_box->box_right = g_value_get_int (value);
if (video_box->box_right < 0) {
video_box->border_right = -video_box->box_right;
video_box->crop_right = 0;
} else {
video_box->border_right = 0;
video_box->crop_right = video_box->box_right;
}
break;
case ARG_TOP:
video_box->box_top = g_value_get_int (value);
if (video_box->box_top < 0) {
video_box->border_top = -video_box->box_top;
video_box->crop_top = 0;
} else {
video_box->border_top = 0;
video_box->crop_top = video_box->box_top;
}
break;
case ARG_BOTTOM:
video_box->box_bottom = g_value_get_int (value);
if (video_box->box_bottom < 0) {
video_box->border_bottom = -video_box->box_bottom;
video_box->crop_bottom = 0;
} else {
video_box->border_bottom = 0;
video_box->crop_bottom = video_box->box_bottom;
}
break;
case ARG_FILL_TYPE:
video_box->fill_type = g_value_get_enum (value);
break;
case ARG_ALPHA:
video_box->alpha = g_value_get_double (value);
break;
case ARG_BORDER_ALPHA:
video_box->border_alpha = g_value_get_double (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_video_box_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstVideoBox *video_box;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_VIDEO_BOX (object));
video_box = GST_VIDEO_BOX (object);
switch (prop_id) {
case ARG_LEFT:
g_value_set_int (value, video_box->box_left);
break;
case ARG_RIGHT:
g_value_set_int (value, video_box->box_right);
break;
case ARG_TOP:
g_value_set_int (value, video_box->box_top);
break;
case ARG_BOTTOM:
g_value_set_int (value, video_box->box_bottom);
break;
case ARG_FILL_TYPE:
g_value_set_enum (value, video_box->fill_type);
break;
case ARG_ALPHA:
g_value_set_double (value, video_box->alpha);
break;
case ARG_BORDER_ALPHA:
g_value_set_double (value, video_box->border_alpha);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstPadLinkReturn
gst_video_box_sink_link (GstPad * pad, const GstCaps * caps)
{
GstVideoBox *video_box;
GstStructure *structure;
gboolean ret;
video_box = GST_VIDEO_BOX (gst_pad_get_parent (pad));
structure = gst_caps_get_structure (caps, 0);
ret = gst_structure_get_int (structure, "width", &video_box->in_width);
ret &= gst_structure_get_int (structure, "height", &video_box->in_height);
return GST_PAD_LINK_OK;
}
#define GST_VIDEO_I420_Y_OFFSET(width,height) (0)
#define GST_VIDEO_I420_U_OFFSET(width,height) ((width)*(height))
#define GST_VIDEO_I420_V_OFFSET(width,height) ((width)*(height) + ((width/2)*(height/2)))
#define GST_VIDEO_I420_Y_ROWSTRIDE(width) (width)
#define GST_VIDEO_I420_U_ROWSTRIDE(width) ((width)/2)
#define GST_VIDEO_I420_V_ROWSTRIDE(width) ((width)/2)
static int yuv_colors_Y[] = { 16, 150, 29 };
static int yuv_colors_U[] = { 128, 46, 255 };
static int yuv_colors_V[] = { 128, 21, 107 };
static void
gst_video_box_i420 (GstVideoBox * video_box, guint8 * src, guint8 * dest)
{
guint8 *srcY, *srcU, *srcV;
guint8 *destY, *destU, *destV;
gint crop_width, crop_height;
gint out_width, out_height;
gint src_stride;
gint br, bl, bt, bb;
gint j;
gint color1, color2;
br = video_box->border_right;
bl = video_box->border_left;
bt = video_box->border_top;
bb = video_box->border_bottom;
out_width = video_box->out_width;
out_height = video_box->out_height;
destY = dest + GST_VIDEO_I420_Y_OFFSET (out_width, out_height);
srcY =
src + GST_VIDEO_I420_Y_OFFSET (video_box->in_width, video_box->in_height);
src_stride = GST_VIDEO_I420_Y_ROWSTRIDE (video_box->in_width);
crop_width =
video_box->in_width - (video_box->crop_left + video_box->crop_right);
crop_height =
video_box->in_height - (video_box->crop_top + video_box->crop_bottom);
srcY += src_stride * video_box->crop_top + video_box->crop_left;
color1 = yuv_colors_Y[video_box->fill_type];
/* copy Y plane first */
for (j = 0; j < bt; j++) {
memset (destY, color1, out_width);
destY += out_width;
}
for (j = 0; j < crop_height; j++) {
memset (destY, color1, bl);
destY += bl;
memcpy (destY, srcY, crop_width);
destY += crop_width;
memset (destY, color1, br);
destY += br;
srcY += src_stride;
}
for (j = 0; j < bb; j++) {
memset (destY, color1, out_width);
destY += out_width;
}
src_stride = GST_VIDEO_I420_U_ROWSTRIDE (video_box->in_width);
destU = dest + GST_VIDEO_I420_U_OFFSET (out_width, out_height);
destV = dest + GST_VIDEO_I420_V_OFFSET (out_width, out_height);
crop_width /= 2;
crop_height /= 2;
out_width /= 2;
out_height /= 2;
bb /= 2;
bt /= 2;
br /= 2;
bl /= 2;
srcU =
src + GST_VIDEO_I420_U_OFFSET (video_box->in_width, video_box->in_height);
srcV =
src + GST_VIDEO_I420_V_OFFSET (video_box->in_width, video_box->in_height);
srcU += src_stride * (video_box->crop_top / 2) + (video_box->crop_left / 2);
srcV += src_stride * (video_box->crop_top / 2) + (video_box->crop_left / 2);
color1 = yuv_colors_U[video_box->fill_type];
color2 = yuv_colors_V[video_box->fill_type];
for (j = 0; j < bt; j++) {
memset (destU, color1, out_width);
memset (destV, color2, out_width);
destU += out_width;
destV += out_width;
}
for (j = 0; j < crop_height; j++) {
memset (destU, color1, bl);
destU += bl;
/* copy U plane */
memcpy (destU, srcU, crop_width);
destU += crop_width;
memset (destU, color1, br);
destU += br;
srcU += src_stride;
memset (destV, color2, bl);
destV += bl;
/* copy V plane */
memcpy (destV, srcV, crop_width);
destV += crop_width;
memset (destV, color2, br);
destV += br;
srcV += src_stride;
}
for (j = 0; j < bb; j++) {
memset (destU, color1, out_width);
memset (destV, color2, out_width);
destU += out_width;
destV += out_width;
}
}
static void
gst_video_box_ayuv (GstVideoBox * video_box, guint8 * src, guint8 * dest)
{
guint8 *srcY, *srcU, *srcV;
gint crop_width, crop_width2, crop_height;
gint out_width, out_height;
gint src_stride, src_stride2;
gint br, bl, bt, bb;
gint colorY, colorU, colorV;
gint i, j;
guint8 b_alpha = (guint8) (video_box->border_alpha * 255);
guint8 i_alpha = (guint8) (video_box->alpha * 255);
guint32 *destp = (guint32 *) dest;
guint32 ayuv;
br = video_box->border_right;
bl = video_box->border_left;
bt = video_box->border_top;
bb = video_box->border_bottom;
out_width = video_box->out_width;
out_height = video_box->out_height;
src_stride = GST_VIDEO_I420_Y_ROWSTRIDE (video_box->in_width);
src_stride2 = src_stride / 2;
crop_width =
video_box->in_width - (video_box->crop_left + video_box->crop_right);
crop_width2 = crop_width / 2;
crop_height =
video_box->in_height - (video_box->crop_top + video_box->crop_bottom);
srcY =
src + GST_VIDEO_I420_Y_OFFSET (video_box->in_width, video_box->in_height);
srcY += src_stride * video_box->crop_top + video_box->crop_left;
srcU =
src + GST_VIDEO_I420_U_OFFSET (video_box->in_width, video_box->in_height);
srcU += src_stride2 * (video_box->crop_top / 2) + (video_box->crop_left / 2);
srcV =
src + GST_VIDEO_I420_V_OFFSET (video_box->in_width, video_box->in_height);
srcV += src_stride2 * (video_box->crop_top / 2) + (video_box->crop_left / 2);
colorY = yuv_colors_Y[video_box->fill_type];
colorU = yuv_colors_U[video_box->fill_type];
colorV = yuv_colors_V[video_box->fill_type];
ayuv =
GUINT32_FROM_BE ((b_alpha << 24) | (colorY << 16) | (colorU << 8) |
colorV);
/* top border */
for (i = 0; i < bt; i++) {
for (j = 0; j < out_width; j++) {
*destp++ = ayuv;
}
}
for (i = 0; i < crop_height; i++) {
/* left border */
for (j = 0; j < bl; j++) {
*destp++ = ayuv;
}
dest = (guint8 *) destp;
/* center */
for (j = 0; j < crop_width2; j++) {
*dest++ = i_alpha;
*dest++ = *srcY++;
*dest++ = *srcU;
*dest++ = *srcV;
*dest++ = i_alpha;
*dest++ = *srcY++;
*dest++ = *srcU++;
*dest++ = *srcV++;
}
if (i % 2 == 0) {
srcU -= crop_width2;
srcV -= crop_width2;
} else {
srcU += src_stride2 - crop_width2;
srcV += src_stride2 - crop_width2;
}
srcY += src_stride - crop_width;
destp = (guint32 *) dest;
/* right border */
for (j = 0; j < br; j++) {
*destp++ = ayuv;
}
}
/* bottom border */
for (i = 0; i < bb; i++) {
for (j = 0; j < out_width; j++) {
*destp++ = ayuv;
}
}
}
static void
gst_video_box_chain (GstPad * pad, GstData * _data)
{
GstBuffer *buffer;
GstVideoBox *video_box;
GstBuffer *outbuf;
gint new_width, new_height;
video_box = GST_VIDEO_BOX (gst_pad_get_parent (pad));
if (GST_IS_EVENT (_data)) {
GstEvent *event = GST_EVENT (_data);
switch (GST_EVENT_TYPE (event)) {
default:
gst_pad_event_default (pad, event);
break;
}
return;
}
buffer = GST_BUFFER (_data);
new_width =
video_box->in_width - (video_box->box_left + video_box->box_right);
new_height =
video_box->in_height - (video_box->box_top + video_box->box_bottom);
if (new_width != video_box->out_width ||
new_height != video_box->out_height ||
!GST_PAD_CAPS (video_box->srcpad)) {
GstCaps *newcaps;
newcaps = gst_caps_copy (gst_pad_get_negotiated_caps (video_box->sinkpad));
video_box->use_alpha = TRUE;
/* try AYUV first */
gst_caps_set_simple (newcaps,
"format", GST_TYPE_FOURCC, GST_STR_FOURCC ("AYUV"),
"width", G_TYPE_INT, new_width, "height", G_TYPE_INT, new_height, NULL);
if (GST_PAD_LINK_FAILED (gst_pad_try_set_caps (video_box->srcpad, newcaps))) {
video_box->use_alpha = FALSE;
newcaps =
gst_caps_copy (gst_pad_get_negotiated_caps (video_box->sinkpad));
gst_caps_set_simple (newcaps, "format", GST_TYPE_FOURCC,
GST_STR_FOURCC ("I420"), "width", G_TYPE_INT, new_width, "height",
G_TYPE_INT, new_height, NULL);
if (GST_PAD_LINK_FAILED (gst_pad_try_set_caps (video_box->srcpad,
newcaps))) {
GST_ELEMENT_ERROR (video_box, CORE, NEGOTIATION, (NULL), (NULL));
return;
}
}
video_box->out_width = new_width;
video_box->out_height = new_height;
}
if (video_box->use_alpha) {
outbuf = gst_buffer_new_and_alloc (new_width * new_height * 4);
gst_video_box_ayuv (video_box,
GST_BUFFER_DATA (buffer), GST_BUFFER_DATA (outbuf));
} else {
outbuf = gst_buffer_new_and_alloc ((new_width * new_height * 3) / 2);
gst_video_box_i420 (video_box,
GST_BUFFER_DATA (buffer), GST_BUFFER_DATA (outbuf));
}
GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buffer);
GST_BUFFER_DURATION (outbuf) = GST_BUFFER_DURATION (buffer);
gst_buffer_unref (buffer);
gst_pad_push (video_box->srcpad, GST_DATA (outbuf));
}
static GstElementStateReturn
gst_video_box_change_state (GstElement * element)
{
GstVideoBox *video_box;
video_box = GST_VIDEO_BOX (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
break;
case GST_STATE_READY_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_PLAYING:
break;
case GST_STATE_PLAYING_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_READY:
break;
case GST_STATE_READY_TO_NULL:
break;
}
parent_class->change_state (element);
return GST_STATE_SUCCESS;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "videobox", GST_RANK_NONE,
GST_TYPE_VIDEO_BOX);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"videobox",
"resizes a video by adding borders or cropping",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)