gstreamer/gst/videocrop/gstvideocrop.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/video/video.h>
#include <string.h>
#define GST_TYPE_VIDEO_CROP \
(gst_video_crop_get_type())
#define GST_VIDEO_CROP(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_VIDEO_CROP,GstVideoCrop))
#define GST_VIDEO_CROP_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_VIDEO_CROP,GstVideoCropClass))
#define GST_IS_VIDEO_CROP(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_VIDEO_CROP))
#define GST_IS_VIDEO_CROP_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_VIDEO_CROP))
typedef struct _GstVideoCrop GstVideoCrop;
typedef struct _GstVideoCropClass GstVideoCropClass;
struct _GstVideoCrop {
GstElement element;
/* pads */
GstPad *sinkpad;
GstPad *srcpad;
/* caps */
gint width, height;
gdouble fps;
gint crop_left, crop_right, crop_top, crop_bottom;
};
struct _GstVideoCropClass {
GstElementClass parent_class;
};
/* elementfactory information */
static GstElementDetails gst_video_crop_details = GST_ELEMENT_DETAILS (
"video crop filter",
"Filter/Effect/Video",
"Crops video into a user defined region",
"Wim Taymans <wim.taymans@chello.be>"
);
/* VideoCrop signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_LEFT,
ARG_RIGHT,
ARG_TOP,
ARG_BOTTOM,
/* FILL ME */
};
static GstStaticPadTemplate gst_video_crop_src_template =
GST_STATIC_PAD_TEMPLATE (
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_YUV_PAD_TEMPLATE_CAPS ("I420"))
);
static GstStaticPadTemplate gst_video_crop_sink_template =
GST_STATIC_PAD_TEMPLATE (
"sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_YUV_PAD_TEMPLATE_CAPS ("I420"))
);
static void gst_video_crop_base_init (gpointer g_class);
static void gst_video_crop_class_init (GstVideoCropClass *klass);
static void gst_video_crop_init (GstVideoCrop *video_crop);
static void gst_video_crop_set_property (GObject *object, guint prop_id,
const GValue *value, GParamSpec *pspec);
static void gst_video_crop_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec);
static GstPadLinkReturn
gst_video_crop_sink_link (GstPad *pad, const GstCaps *caps);
static void gst_video_crop_chain (GstPad *pad, GstData *_data);
static GstElementStateReturn
gst_video_crop_change_state (GstElement *element);
static GstElementClass *parent_class = NULL;
/* static guint gst_video_crop_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_video_crop_get_type (void)
{
static GType video_crop_type = 0;
if (!video_crop_type) {
static const GTypeInfo video_crop_info = {
sizeof(GstVideoCropClass),
gst_video_crop_base_init,
NULL,
(GClassInitFunc)gst_video_crop_class_init,
NULL,
NULL,
sizeof(GstVideoCrop),
0,
(GInstanceInitFunc)gst_video_crop_init,
};
video_crop_type = g_type_register_static(GST_TYPE_ELEMENT, "GstVideoCrop", &video_crop_info, 0);
}
return video_crop_type;
}
static void
gst_video_crop_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (element_class, &gst_video_crop_details);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_video_crop_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_video_crop_src_template));
}
static void
gst_video_crop_class_init (GstVideoCropClass *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_LEFT,
g_param_spec_int ("left", "Left", "Pixels to crop at left",
0, G_MAXINT, 0, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_RIGHT,
g_param_spec_int ("right", "Right", "Pixels to crop at right",
0, G_MAXINT, 0, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_TOP,
g_param_spec_int ("top", "Top", "Pixels to crop at top",
0, G_MAXINT, 0, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BOTTOM,
g_param_spec_int ("bottom", "Bottom", "Pixels to crop at bottom",
0, G_MAXINT, 0, G_PARAM_READWRITE));
gobject_class->set_property = gst_video_crop_set_property;
gobject_class->get_property = gst_video_crop_get_property;
gstelement_class->change_state = gst_video_crop_change_state;
}
static void
gst_video_crop_init (GstVideoCrop *video_crop)
{
/* create the sink and src pads */
video_crop->sinkpad = gst_pad_new_from_template(
gst_static_pad_template_get (&gst_video_crop_sink_template), "sink");
gst_element_add_pad (GST_ELEMENT (video_crop), video_crop->sinkpad);
gst_pad_set_chain_function (video_crop->sinkpad, gst_video_crop_chain);
gst_pad_set_link_function (video_crop->sinkpad, gst_video_crop_sink_link);
video_crop->srcpad = gst_pad_new_from_template(
gst_static_pad_template_get (&gst_video_crop_src_template), "src");
gst_element_add_pad (GST_ELEMENT (video_crop), video_crop->srcpad);
video_crop->crop_right = 0;
video_crop->crop_left = 0;
video_crop->crop_top = 0;
video_crop->crop_bottom = 0;
GST_FLAG_SET (video_crop, GST_ELEMENT_EVENT_AWARE);
}
/* do we need this function? */
static void
gst_video_crop_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
GstVideoCrop *video_crop;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_VIDEO_CROP (object));
video_crop = GST_VIDEO_CROP (object);
switch (prop_id) {
case ARG_LEFT:
video_crop->crop_left = g_value_get_int (value);
break;
case ARG_RIGHT:
video_crop->crop_right = g_value_get_int (value);
break;
case ARG_TOP:
video_crop->crop_top = g_value_get_int (value);
break;
case ARG_BOTTOM:
video_crop->crop_bottom = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_video_crop_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
GstVideoCrop *video_crop;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_VIDEO_CROP (object));
video_crop = GST_VIDEO_CROP (object);
switch (prop_id) {
case ARG_LEFT:
g_value_set_int (value, video_crop->crop_left);
break;
case ARG_RIGHT:
g_value_set_int (value, video_crop->crop_right);
break;
case ARG_TOP:
g_value_set_int (value, video_crop->crop_top);
break;
case ARG_BOTTOM:
g_value_set_int (value, video_crop->crop_bottom);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstPadLinkReturn
gst_video_crop_sink_link (GstPad *pad, const GstCaps *caps)
{
GstVideoCrop *video_crop;
GstStructure *structure;
gboolean ret;
video_crop = GST_VIDEO_CROP (gst_pad_get_parent (pad));
structure = gst_caps_get_structure (caps, 0);
ret = gst_structure_get_int (structure, "width", &video_crop->width);
ret &= gst_structure_get_int (structure, "height", &video_crop->height);
ret &= gst_structure_get_double (structure, "framerate", &video_crop->fps);
return GST_PAD_LINK_OK;
}
#define GST_VIDEO_I420_SIZE(width,height) ((width)*(height) + ((width)/2)*((height)/2)*2)
#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 void
gst_video_crop_i420 (GstVideoCrop *video_crop, GstBuffer *src_buffer, GstBuffer *dest_buffer)
{
guint8 *src;
guint8 *dest;
guint8 *srcY, *srcU, *srcV;
guint8 *destY, *destU, *destV;
gint out_width = video_crop->width -
(video_crop->crop_left + video_crop->crop_right);
gint out_height = video_crop->height -
(video_crop->crop_top + video_crop->crop_bottom);
gint src_stride;
gint j;
src = GST_BUFFER_DATA (src_buffer);
dest = GST_BUFFER_DATA (dest_buffer);
g_return_if_fail(GST_BUFFER_SIZE (dest_buffer) == GST_VIDEO_I420_SIZE(out_width,out_height));
srcY = src + GST_VIDEO_I420_Y_OFFSET(video_crop->width, video_crop->height);
destY = dest + GST_VIDEO_I420_Y_OFFSET(out_width, out_height);
src_stride = GST_VIDEO_I420_Y_ROWSTRIDE(video_crop->width);
/* copy Y plane first */
srcY += src_stride * video_crop->crop_top + video_crop->crop_left;
for (j = 0; j < out_height; j++) {
memcpy (destY, srcY, out_width);
srcY += src_stride;
destY += out_width;
}
src_stride = GST_VIDEO_I420_U_ROWSTRIDE(video_crop->width);
destU = dest + GST_VIDEO_I420_U_OFFSET(out_width, out_height);
destV = dest + GST_VIDEO_I420_V_OFFSET(out_width, out_height);
srcU = src + GST_VIDEO_I420_U_OFFSET(video_crop->width, video_crop->height);
srcV = src + GST_VIDEO_I420_V_OFFSET(video_crop->width, video_crop->height);
srcU += src_stride * (video_crop->crop_top/2) + (video_crop->crop_left/2);
srcV += src_stride * (video_crop->crop_top/2) + (video_crop->crop_left/2);
for (j = 0; j < out_height/2; j++) {
/* copy U plane */
memcpy (destU, srcU, out_width/2);
srcU += src_stride;
destU += out_width/2;
/* copy V plane */
memcpy (destV, srcV, out_width/2);
srcV += src_stride;
destV += out_width/2;
}
}
static void
gst_video_crop_chain (GstPad *pad, GstData *_data)
{
GstBuffer *buffer = GST_BUFFER (_data);
GstVideoCrop *video_crop;
GstBuffer *outbuf;
gint new_width, new_height;
video_crop = GST_VIDEO_CROP (gst_pad_get_parent (pad));
if (GST_IS_EVENT (buffer)) {
GstEvent *event = GST_EVENT (buffer);
switch (GST_EVENT_TYPE (event)) {
default:
gst_pad_event_default (pad, event);
break;
}
return;
}
new_width = video_crop->width -
(video_crop->crop_left + video_crop->crop_right);
new_height = video_crop->height -
(video_crop->crop_top + video_crop->crop_bottom);
outbuf = gst_buffer_new_and_alloc ((new_width * new_height * 3) / 2);
GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buffer);
gst_video_crop_i420 (video_crop, buffer, outbuf);
gst_buffer_unref (buffer);
gst_pad_push (video_crop->srcpad, GST_DATA (outbuf));
}
static GstElementStateReturn
gst_video_crop_change_state (GstElement *element)
{
GstVideoCrop *video_crop;
video_crop = GST_VIDEO_CROP (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, "videocrop", GST_RANK_PRIMARY, GST_TYPE_VIDEO_CROP);
}
GST_PLUGIN_DEFINE (
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"videocrop",
"Crops video into a user defined region",
plugin_init,
VERSION,
GST_LICENSE,
GST_PACKAGE,
GST_ORIGIN
)