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gstreamer/gst/videocrop/gstvideocrop.c

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/* GStreamer video frame cropping
* Copyright (C) 2006 Tim-Philipp Müller <tim centricular 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.
*/
/**
* SECTION:element-videocrop
* @see_also: #GstVideoBox
*
* This element crops video frames, meaning it can remove parts of the
* picture on the left, right, top or bottom of the picture and output
* a smaller picture than the input picture, with the unwanted parts at the
* border removed.
*
* The videocrop element is similar to the videobox element, but its main
* goal is to support a multitude of formats as efficiently as possible.
* Unlike videbox, it cannot add borders to the picture and unlike videbox
* it will always output images in exactly the same format as the input image.
*
* If there is nothing to crop, the element will operate in pass-through mode.
*
* Note that no special efforts are made to handle chroma-subsampled formats
* in the case of odd-valued cropping and compensate for sub-unit chroma plane
* shifts for such formats in the case where the #GstVideoCrop:left or
* #GstVideoCrop:top property is set to an odd number. This doesn't matter for
* most use cases, but it might matter for yours.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v videotestsrc ! videocrop top=42 left=1 right=4 bottom=0 ! ximagesink
* ]|
* </refsect2>
*/
/* TODO:
* - for packed formats, we could avoid memcpy() in case crop_left
* and crop_right are 0 and just create a sub-buffer of the input
* buffer
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/video/video.h>
#include "gstvideocrop.h"
#include "gstaspectratiocrop.h"
#include <string.h>
GST_DEBUG_CATEGORY_STATIC (videocrop_debug);
#define GST_CAT_DEFAULT videocrop_debug
enum
{
ARG_0,
ARG_LEFT,
ARG_RIGHT,
ARG_TOP,
ARG_BOTTOM
};
#define VIDEO_CROP_CAPS \
GST_VIDEO_CAPS_MAKE ("{ RGBx, xRGB, BGRx, xBGR, " \
"RGBA, ARGB, BGRA, ABGR, RGB, BGR, AYUV, YUY2, " \
"YVYU, UYVY, Y800, I420, RGB16, RGB15, GRAY8 }")
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (VIDEO_CROP_CAPS)
);
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (VIDEO_CROP_CAPS)
);
#define gst_video_crop_parent_class parent_class
G_DEFINE_TYPE (GstVideoCrop, gst_video_crop, GST_TYPE_BASE_TRANSFORM);
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 GstCaps *gst_video_crop_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * filter_caps);
static GstFlowReturn gst_video_crop_transform (GstBaseTransform * trans,
GstBuffer * inbuf, GstBuffer * outbuf);
static gboolean gst_video_crop_get_unit_size (GstBaseTransform * trans,
GstCaps * caps, gsize * size);
static gboolean gst_video_crop_set_caps (GstBaseTransform * trans,
GstCaps * in_caps, GstCaps * outcaps);
static gboolean gst_video_crop_src_event (GstBaseTransform * trans,
GstEvent * event);
static gboolean
gst_video_crop_src_event (GstBaseTransform * trans, GstEvent * event)
{
GstEvent *new_event;
GstStructure *new_structure;
const GstStructure *structure;
const gchar *event_name;
double pointer_x;
double pointer_y;
GstVideoCrop *vcrop = GST_VIDEO_CROP (trans);
new_event = NULL;
GST_OBJECT_LOCK (vcrop);
if (GST_EVENT_TYPE (event) == GST_EVENT_NAVIGATION &&
(vcrop->crop_left != 0 || vcrop->crop_top != 0)) {
structure = gst_event_get_structure (event);
event_name = gst_structure_get_string (structure, "event");
if (event_name &&
(strcmp (event_name, "mouse-move") == 0 ||
strcmp (event_name, "mouse-button-press") == 0 ||
strcmp (event_name, "mouse-button-release") == 0)) {
if (gst_structure_get_double (structure, "pointer_x", &pointer_x) &&
gst_structure_get_double (structure, "pointer_y", &pointer_y)) {
new_structure = gst_structure_copy (structure);
gst_structure_set (new_structure,
"pointer_x", G_TYPE_DOUBLE, (double) (pointer_x + vcrop->crop_left),
"pointer_y", G_TYPE_DOUBLE, (double) (pointer_y + vcrop->crop_top),
NULL);
new_event = gst_event_new_navigation (new_structure);
gst_event_unref (event);
} else {
GST_WARNING_OBJECT (vcrop, "Failed to read navigation event");
}
}
}
GST_OBJECT_UNLOCK (vcrop);
return GST_BASE_TRANSFORM_CLASS (parent_class)->src_event (trans,
(new_event ? new_event : event));
}
static void
gst_video_crop_class_init (GstVideoCropClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
GstBaseTransformClass *basetransform_class;
gobject_class = (GObjectClass *) klass;
element_class = (GstElementClass *) klass;
basetransform_class = (GstBaseTransformClass *) klass;
gst_element_class_set_details_simple (element_class, "Crop",
"Filter/Effect/Video",
"Crops video into a user-defined region",
"Tim-Philipp Müller <tim centricular net>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_template));
gst_element_class_set_details_simple (element_class, "Crop",
"Filter/Effect/Video",
"Crops video into a user-defined region",
"Tim-Philipp Müller <tim centricular net>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_template));
gobject_class->set_property = gst_video_crop_set_property;
gobject_class->get_property = gst_video_crop_get_property;
g_object_class_install_property (gobject_class, ARG_LEFT,
g_param_spec_int ("left", "Left", "Pixels to crop at left",
0, G_MAXINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, ARG_RIGHT,
g_param_spec_int ("right", "Right", "Pixels to crop at right",
0, G_MAXINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, ARG_TOP,
g_param_spec_int ("top", "Top", "Pixels to crop at top",
0, G_MAXINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, ARG_BOTTOM,
g_param_spec_int ("bottom", "Bottom", "Pixels to crop at bottom",
0, G_MAXINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
basetransform_class->transform = GST_DEBUG_FUNCPTR (gst_video_crop_transform);
basetransform_class->transform_caps =
GST_DEBUG_FUNCPTR (gst_video_crop_transform_caps);
basetransform_class->set_caps = GST_DEBUG_FUNCPTR (gst_video_crop_set_caps);
basetransform_class->get_unit_size =
GST_DEBUG_FUNCPTR (gst_video_crop_get_unit_size);
basetransform_class->passthrough_on_same_caps = FALSE;
basetransform_class->src_event = GST_DEBUG_FUNCPTR (gst_video_crop_src_event);
}
static void
gst_video_crop_init (GstVideoCrop * vcrop)
{
vcrop->crop_right = 0;
vcrop->crop_left = 0;
vcrop->crop_top = 0;
vcrop->crop_bottom = 0;
}
static gboolean
gst_video_crop_get_image_details_from_caps (GstVideoCrop * vcrop,
GstVideoCropImageDetails * details, GstCaps * caps)
{
gst_video_info_init (&details->info);
if (!gst_video_info_from_caps (&details->info, caps)) {
goto incomplete_format;
}
if (details->info.width == 0 && details->info.height == 0) {
goto incomplete_format;
}
if (GST_VIDEO_INFO_IS_RGB (&details->info)
|| GST_VIDEO_INFO_IS_GRAY (&details->info)) {
details->packing = VIDEO_CROP_PIXEL_FORMAT_PACKED_SIMPLE;
} else {
switch (GST_VIDEO_INFO_FORMAT (&details->info)) {
case GST_VIDEO_FORMAT_AYUV:
details->packing = VIDEO_CROP_PIXEL_FORMAT_PACKED_SIMPLE;
break;
case GST_VIDEO_FORMAT_YVYU:
case GST_VIDEO_FORMAT_YUY2:
case GST_VIDEO_FORMAT_UYVY:
details->packing = VIDEO_CROP_PIXEL_FORMAT_PACKED_COMPLEX;
if (GST_VIDEO_INFO_FORMAT (&details->info) == GST_VIDEO_FORMAT_UYVY) {
/* UYVY = 4:2:2 - [U0 Y0 V0 Y1] [U2 Y2 V2 Y3] [U4 Y4 V4 Y5] */
details->macro_y_off = 1;
} else {
/* YUYV = 4:2:2 - [Y0 U0 Y1 V0] [Y2 U2 Y3 V2] [Y4 U4 Y5 V4] = YUY2 */
details->macro_y_off = 0;
}
break;
case GST_VIDEO_FORMAT_Y800:
details->packing = VIDEO_CROP_PIXEL_FORMAT_PACKED_SIMPLE;
break;
case GST_VIDEO_FORMAT_I420:
case GST_VIDEO_FORMAT_YV12:
details->packing = VIDEO_CROP_PIXEL_FORMAT_PLANAR;
break;
default:
goto unknown_format;
}
}
return TRUE;
/* ERRORS */
unknown_format:
{
GST_ELEMENT_ERROR (vcrop, STREAM, NOT_IMPLEMENTED, (NULL),
("Unsupported format"));
return FALSE;
}
incomplete_format:
{
GST_ELEMENT_ERROR (vcrop, CORE, NEGOTIATION, (NULL),
("Incomplete caps, some required field is missing"));
return FALSE;
}
}
static gboolean
gst_video_crop_get_unit_size (GstBaseTransform * trans, GstCaps * caps,
gsize * size)
{
GstVideoCropImageDetails img_details = { 0, };
GstVideoCrop *vcrop = GST_VIDEO_CROP (trans);
if (!gst_video_crop_get_image_details_from_caps (vcrop, &img_details, caps))
return FALSE;
*size = GST_VIDEO_INFO_SIZE (&img_details.info);
return TRUE;
}
#define ROUND_DOWN_2(n) ((n)&(~1))
static void
gst_video_crop_transform_packed_complex (GstVideoCrop * vcrop,
GstBuffer * inbuf, GstBuffer * outbuf)
{
guint8 *in_data, *out_data;
gpointer in_bufdata, out_bufdata;
gsize insize, outsize;
guint i, dx;
gint in_stride;
gint out_stride;
in_bufdata = gst_buffer_map (inbuf, &insize, NULL, GST_MAP_READ);
out_bufdata = gst_buffer_map (outbuf, &outsize, NULL, GST_MAP_WRITE);
in_data = in_bufdata;
out_data = out_bufdata;
in_stride = GST_VIDEO_INFO_PLANE_STRIDE (&vcrop->in.info, 0);
out_stride = GST_VIDEO_INFO_PLANE_STRIDE (&vcrop->out.info, 0);
in_data += vcrop->crop_top * in_stride;
/* rounding down here so we end up at the start of a macro-pixel and not
* in the middle of one */
in_data +=
ROUND_DOWN_2 (vcrop->crop_left) *
GST_VIDEO_INFO_COMP_PSTRIDE (&vcrop->in.info, 0);
dx = GST_VIDEO_INFO_WIDTH (&vcrop->out.info) *
GST_VIDEO_INFO_COMP_PSTRIDE (&vcrop->out.info, 0);
/* UYVY = 4:2:2 - [U0 Y0 V0 Y1] [U2 Y2 V2 Y3] [U4 Y4 V4 Y5]
* YUYV = 4:2:2 - [Y0 U0 Y1 V0] [Y2 U2 Y3 V2] [Y4 U4 Y5 V4] = YUY2 */
if ((vcrop->crop_left % 2) != 0) {
for (i = 0; i < GST_VIDEO_INFO_HEIGHT (&vcrop->out.info); ++i) {
gint j;
memcpy (out_data, in_data, dx);
/* move just the Y samples one pixel to the left, don't worry about
* chroma shift */
for (j = vcrop->in.macro_y_off; j < out_stride - 2; j += 2)
out_data[j] = in_data[j + 2];
in_data += in_stride;
out_data += out_stride;
}
} else {
for (i = 0; i < GST_VIDEO_INFO_HEIGHT (&vcrop->out.info); ++i) {
memcpy (out_data, in_data, dx);
in_data += in_stride;
out_data += out_stride;
}
}
gst_buffer_unmap (inbuf, in_bufdata, insize);
gst_buffer_unmap (outbuf, out_bufdata, outsize);
}
static void
gst_video_crop_transform_packed_simple (GstVideoCrop * vcrop,
GstBuffer * inbuf, GstBuffer * outbuf)
{
guint8 *in_data, *out_data;
gpointer in_bufdata, out_bufdata;
gsize insize, outsize;
guint i, dx;
gint in_stride, out_stride;
in_bufdata = gst_buffer_map (inbuf, &insize, NULL, GST_MAP_READ);
out_bufdata = gst_buffer_map (outbuf, &outsize, NULL, GST_MAP_WRITE);
in_data = in_bufdata;
out_data = out_bufdata;
in_stride = GST_VIDEO_INFO_PLANE_STRIDE (&vcrop->in.info, 0);
out_stride = GST_VIDEO_INFO_PLANE_STRIDE (&vcrop->out.info, 0);
in_data += vcrop->crop_top * in_stride;
in_data +=
vcrop->crop_left * GST_VIDEO_INFO_COMP_PSTRIDE (&vcrop->in.info, 0);
dx = GST_VIDEO_INFO_WIDTH (&vcrop->out.info) *
GST_VIDEO_INFO_COMP_PSTRIDE (&vcrop->out.info, 0);
for (i = 0; i < GST_VIDEO_INFO_HEIGHT (&vcrop->out.info); ++i) {
memcpy (out_data, in_data, dx);
in_data += in_stride;
out_data += out_stride;
}
gst_buffer_unmap (inbuf, in_bufdata, insize);
gst_buffer_unmap (outbuf, out_bufdata, outsize);
}
static void
gst_video_crop_transform_planar (GstVideoCrop * vcrop, GstBuffer * inbuf,
GstBuffer * outbuf)
{
guint8 *y_out, *u_out, *v_out;
guint8 *y_in, *u_in, *v_in;
guint i, dx;
gpointer in_bufdata, out_bufdata;
gsize insize, outsize;
in_bufdata = gst_buffer_map (inbuf, &insize, NULL, GST_MAP_READ);
out_bufdata = gst_buffer_map (outbuf, &outsize, NULL, GST_MAP_WRITE);
/* Y plane */
y_in = in_bufdata;
y_out = out_bufdata;
y_in +=
(vcrop->crop_top * GST_VIDEO_INFO_PLANE_STRIDE (&vcrop->in.info,
0)) + vcrop->crop_left;
dx = GST_VIDEO_INFO_WIDTH (&vcrop->out.info) * 1;
for (i = 0; i < GST_VIDEO_INFO_HEIGHT (&vcrop->out.info); ++i) {
memcpy (y_out, y_in, dx);
y_in += GST_VIDEO_INFO_PLANE_STRIDE (&vcrop->in.info, 0);
y_out += GST_VIDEO_INFO_PLANE_STRIDE (&vcrop->out.info, 0);
}
/* U + V planes */
u_in =
(guint8 *) in_bufdata + GST_VIDEO_INFO_PLANE_OFFSET (&vcrop->in.info, 1);
u_out =
(guint8 *) out_bufdata + GST_VIDEO_INFO_PLANE_OFFSET (&vcrop->out.info,
1);
u_in +=
(vcrop->crop_top / 2) * GST_VIDEO_INFO_PLANE_STRIDE (&vcrop->in.info, 1);
u_in += vcrop->crop_left / 2;
v_in =
(guint8 *) in_bufdata + GST_VIDEO_INFO_PLANE_OFFSET (&vcrop->in.info, 2);
v_out =
(guint8 *) out_bufdata + GST_VIDEO_INFO_PLANE_OFFSET (&vcrop->out.info,
2);
v_in +=
(vcrop->crop_top / 2) * GST_VIDEO_INFO_PLANE_STRIDE (&vcrop->in.info, 2);
v_in += vcrop->crop_left / 2;
dx = GST_ROUND_UP_2 (GST_VIDEO_INFO_WIDTH (&vcrop->out.info)) / 2;
for (i = 0; i < GST_ROUND_UP_2 (GST_VIDEO_INFO_HEIGHT (&vcrop->out.info)) / 2;
++i) {
memcpy (u_out, u_in, dx);
memcpy (v_out, v_in, dx);
u_in += GST_VIDEO_INFO_PLANE_STRIDE (&vcrop->in.info, 1);
u_out += GST_VIDEO_INFO_PLANE_STRIDE (&vcrop->out.info, 1);
v_in += GST_VIDEO_INFO_PLANE_STRIDE (&vcrop->in.info, 2);
v_out += GST_VIDEO_INFO_PLANE_STRIDE (&vcrop->out.info, 2);
}
gst_buffer_unmap (inbuf, in_bufdata, insize);
gst_buffer_unmap (outbuf, out_bufdata, outsize);
}
static GstFlowReturn
gst_video_crop_transform (GstBaseTransform * trans, GstBuffer * inbuf,
GstBuffer * outbuf)
{
GstVideoCrop *vcrop = GST_VIDEO_CROP (trans);
switch (vcrop->in.packing) {
case VIDEO_CROP_PIXEL_FORMAT_PACKED_SIMPLE:
gst_video_crop_transform_packed_simple (vcrop, inbuf, outbuf);
break;
case VIDEO_CROP_PIXEL_FORMAT_PACKED_COMPLEX:
gst_video_crop_transform_packed_complex (vcrop, inbuf, outbuf);
break;
case VIDEO_CROP_PIXEL_FORMAT_PLANAR:
gst_video_crop_transform_planar (vcrop, inbuf, outbuf);
break;
default:
g_assert_not_reached ();
}
return GST_FLOW_OK;
}
static gint
gst_video_crop_transform_dimension (gint val, gint delta)
{
gint64 new_val = (gint64) val + (gint64) delta;
new_val = CLAMP (new_val, 1, G_MAXINT);
return (gint) new_val;
}
static gboolean
gst_video_crop_transform_dimension_value (const GValue * src_val,
gint delta, GValue * dest_val)
{
gboolean ret = TRUE;
g_value_init (dest_val, G_VALUE_TYPE (src_val));
if (G_VALUE_HOLDS_INT (src_val)) {
gint ival = g_value_get_int (src_val);
ival = gst_video_crop_transform_dimension (ival, delta);
g_value_set_int (dest_val, ival);
} else if (GST_VALUE_HOLDS_INT_RANGE (src_val)) {
gint min = gst_value_get_int_range_min (src_val);
gint max = gst_value_get_int_range_max (src_val);
min = gst_video_crop_transform_dimension (min, delta);
max = gst_video_crop_transform_dimension (max, delta);
gst_value_set_int_range (dest_val, min, max);
} else if (GST_VALUE_HOLDS_LIST (src_val)) {
gint i;
for (i = 0; i < gst_value_list_get_size (src_val); ++i) {
const GValue *list_val;
GValue newval = { 0, };
list_val = gst_value_list_get_value (src_val, i);
if (gst_video_crop_transform_dimension_value (list_val, delta, &newval))
gst_value_list_append_value (dest_val, &newval);
g_value_unset (&newval);
}
if (gst_value_list_get_size (dest_val) == 0) {
g_value_unset (dest_val);
ret = FALSE;
}
} else {
g_value_unset (dest_val);
ret = FALSE;
}
return ret;
}
/* TODO use filter_caps */
static GstCaps *
gst_video_crop_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * filter_caps)
{
GstVideoCrop *vcrop;
GstCaps *other_caps;
gint dy, dx, i;
vcrop = GST_VIDEO_CROP (trans);
GST_OBJECT_LOCK (vcrop);
GST_LOG_OBJECT (vcrop, "l=%d,r=%d,b=%d,t=%d",
vcrop->crop_left, vcrop->crop_right, vcrop->crop_bottom, vcrop->crop_top);
if (direction == GST_PAD_SRC) {
dx = vcrop->crop_left + vcrop->crop_right;
dy = vcrop->crop_top + vcrop->crop_bottom;
} else {
dx = 0 - (vcrop->crop_left + vcrop->crop_right);
dy = 0 - (vcrop->crop_top + vcrop->crop_bottom);
}
GST_OBJECT_UNLOCK (vcrop);
GST_LOG_OBJECT (vcrop, "transforming caps %" GST_PTR_FORMAT, caps);
other_caps = gst_caps_new_empty ();
for (i = 0; i < gst_caps_get_size (caps); ++i) {
const GValue *v;
GstStructure *structure, *new_structure;
GValue w_val = { 0, }, h_val = {
0,};
structure = gst_caps_get_structure (caps, i);
v = gst_structure_get_value (structure, "width");
if (!gst_video_crop_transform_dimension_value (v, dx, &w_val)) {
GST_WARNING_OBJECT (vcrop, "could not tranform width value with dx=%d"
", caps structure=%" GST_PTR_FORMAT, dx, structure);
continue;
}
v = gst_structure_get_value (structure, "height");
if (!gst_video_crop_transform_dimension_value (v, dy, &h_val)) {
g_value_unset (&w_val);
GST_WARNING_OBJECT (vcrop, "could not tranform height value with dy=%d"
", caps structure=%" GST_PTR_FORMAT, dy, structure);
continue;
}
new_structure = gst_structure_copy (structure);
gst_structure_set_value (new_structure, "width", &w_val);
gst_structure_set_value (new_structure, "height", &h_val);
g_value_unset (&w_val);
g_value_unset (&h_val);
GST_LOG_OBJECT (vcrop, "transformed structure %2d: %" GST_PTR_FORMAT
" => %" GST_PTR_FORMAT, i, structure, new_structure);
gst_caps_append_structure (other_caps, new_structure);
}
if (gst_caps_is_empty (other_caps)) {
gst_caps_unref (other_caps);
other_caps = NULL;
}
if (other_caps && filter_caps) {
GstCaps *tmp = gst_caps_intersect_full (filter_caps, other_caps,
GST_CAPS_INTERSECT_FIRST);
gst_caps_replace (&other_caps, tmp);
gst_caps_unref (tmp);
}
return other_caps;
}
static gboolean
gst_video_crop_set_caps (GstBaseTransform * trans, GstCaps * incaps,
GstCaps * outcaps)
{
GstVideoCrop *crop = GST_VIDEO_CROP (trans);
if (!gst_video_crop_get_image_details_from_caps (crop, &crop->in, incaps))
goto wrong_input;
if (!gst_video_crop_get_image_details_from_caps (crop, &crop->out, outcaps))
goto wrong_output;
if (G_UNLIKELY ((crop->crop_left + crop->crop_right) >=
GST_VIDEO_INFO_WIDTH (&crop->in.info)
|| (crop->crop_top + crop->crop_bottom) >=
GST_VIDEO_INFO_HEIGHT (&crop->in.info)))
goto cropping_too_much;
GST_LOG_OBJECT (crop, "incaps = %" GST_PTR_FORMAT ", outcaps = %"
GST_PTR_FORMAT, incaps, outcaps);
if ((crop->crop_left | crop->crop_right | crop->crop_top | crop->
crop_bottom) == 0) {
GST_LOG_OBJECT (crop, "we are using passthrough");
gst_base_transform_set_passthrough (GST_BASE_TRANSFORM (crop), TRUE);
} else {
GST_LOG_OBJECT (crop, "we are not using passthrough");
gst_base_transform_set_passthrough (GST_BASE_TRANSFORM (crop), FALSE);
}
return TRUE;
/* ERROR */
wrong_input:
{
GST_DEBUG_OBJECT (crop, "failed to parse input caps %" GST_PTR_FORMAT,
incaps);
return FALSE;
}
wrong_output:
{
GST_DEBUG_OBJECT (crop, "failed to parse output caps %" GST_PTR_FORMAT,
outcaps);
return FALSE;
}
cropping_too_much:
{
GST_DEBUG_OBJECT (crop, "we are cropping too much");
return FALSE;
}
}
static void
gst_video_crop_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstVideoCrop *video_crop;
video_crop = GST_VIDEO_CROP (object);
/* don't modify while we are transforming */
GST_BASE_TRANSFORM_LOCK (GST_BASE_TRANSFORM_CAST (video_crop));
/* protect with the object lock so that we can read them */
GST_OBJECT_LOCK (video_crop);
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;
}
GST_OBJECT_UNLOCK (video_crop);
GST_LOG_OBJECT (video_crop, "l=%d,r=%d,b=%d,t=%d",
video_crop->crop_left, video_crop->crop_right, video_crop->crop_bottom,
video_crop->crop_top);
gst_base_transform_reconfigure (GST_BASE_TRANSFORM (video_crop));
GST_BASE_TRANSFORM_UNLOCK (GST_BASE_TRANSFORM_CAST (video_crop));
}
static void
gst_video_crop_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstVideoCrop *video_crop;
video_crop = GST_VIDEO_CROP (object);
GST_OBJECT_LOCK (video_crop);
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;
}
GST_OBJECT_UNLOCK (video_crop);
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (videocrop_debug, "videocrop", 0, "videocrop");
if (gst_element_register (plugin, "videocrop", GST_RANK_NONE,
GST_TYPE_VIDEO_CROP)
&& gst_element_register (plugin, "aspectratiocrop", GST_RANK_NONE,
GST_TYPE_ASPECT_RATIO_CROP))
return TRUE;
return FALSE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"videocrop",
"Crops video into a user-defined region",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
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