gstreamer/gst/videocrop/gstaspectratiocrop.c

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/* GStreamer video frame cropping to aspect-ratio
* Copyright (C) 2009 Thijs Vermeir <thijsvermeir@gmail.com>
*
* 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.
*/
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/**
* SECTION:element-aspectratiocrop
* @see_also: #GstVideoCrop
*
* This element crops video frames to a specified #GstAspectRatioCrop:aspect-ratio.
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*
* If the aspect-ratio is already correct, the element will operate
* in pass-through mode.
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*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v videotestsrc ! video/x-raw-rgb,height=640,width=480 ! aspectratiocrop aspect-ratio=16/9 ! ximagesink
* ]| This pipeline generates a videostream in 4/3 and crops it to 16/9.
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* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/video/video.h>
#include "gstaspectratiocrop.h"
GST_DEBUG_CATEGORY_STATIC (aspect_ratio_crop_debug);
#define GST_CAT_DEFAULT aspect_ratio_crop_debug
static const GstElementDetails aspect_ratio_crop_details =
GST_ELEMENT_DETAILS ("aspectratiocrop",
"Filter/Effect/Video",
"Crops video into a user-defined aspect-ratio",
"Thijs Vermeir <thijsvermeir@gmail.com>");
enum
{
ARG_0,
ARG_ASPECT_RATIO_CROP,
};
/* we support the same caps as videocrop */
#define ASPECT_RATIO_CROP_CAPS \
GST_VIDEO_CAPS_RGBx ";" \
GST_VIDEO_CAPS_xRGB ";" \
GST_VIDEO_CAPS_BGRx ";" \
GST_VIDEO_CAPS_xBGR ";" \
GST_VIDEO_CAPS_RGBA ";" \
GST_VIDEO_CAPS_ARGB ";" \
GST_VIDEO_CAPS_BGRA ";" \
GST_VIDEO_CAPS_ABGR ";" \
GST_VIDEO_CAPS_RGB ";" \
GST_VIDEO_CAPS_BGR ";" \
GST_VIDEO_CAPS_YUV ("AYUV") ";" \
GST_VIDEO_CAPS_YUV ("YUY2") ";" \
GST_VIDEO_CAPS_YUV ("YVYU") ";" \
GST_VIDEO_CAPS_YUV ("UYVY") ";" \
GST_VIDEO_CAPS_YUV ("Y800") ";" \
GST_VIDEO_CAPS_YUV ("I420") ";" \
GST_VIDEO_CAPS_YUV ("YV12") ";" \
GST_VIDEO_CAPS_RGB_16 ";" \
GST_VIDEO_CAPS_RGB_15
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (ASPECT_RATIO_CROP_CAPS)
);
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (ASPECT_RATIO_CROP_CAPS)
);
GST_BOILERPLATE (GstAspectRatioCrop, gst_aspect_ratio_crop, GstBin,
GST_TYPE_BIN);
static void gst_aspect_ratio_crop_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_aspect_ratio_crop_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_aspect_ratio_crop_set_cropping (GstAspectRatioCrop *
aspect_ratio_crop, gint top, gint right, gint bottom, gint left);
static GstCaps *gst_aspect_ratio_crop_get_caps (GstPad * pad);
static gboolean gst_aspect_ratio_crop_set_caps (GstPad * pad, GstCaps * caps);
static void gst_aspect_ratio_crop_finalize (GObject * object);
static void gst_aspect_ratio_transform_structure (GstAspectRatioCrop *
aspect_ratio_crop, GstStructure * structure, GstStructure ** new_structure,
gboolean set_videocrop);
static void
gst_aspect_ratio_crop_set_cropping (GstAspectRatioCrop * aspect_ratio_crop,
gint top, gint right, gint bottom, gint left)
{
GValue value = { 0 };
if (G_UNLIKELY (!aspect_ratio_crop->videocrop)) {
GST_WARNING_OBJECT (aspect_ratio_crop,
"Can't set the settings if there is no cropping element");
return;
}
g_value_init (&value, G_TYPE_INT);
g_value_set_int (&value, top);
GST_DEBUG_OBJECT (aspect_ratio_crop, "set top cropping to: %d", top);
g_object_set_property (G_OBJECT (aspect_ratio_crop->videocrop), "top",
&value);
g_value_set_int (&value, right);
GST_DEBUG_OBJECT (aspect_ratio_crop, "set right cropping to: %d", right);
g_object_set_property (G_OBJECT (aspect_ratio_crop->videocrop), "right",
&value);
g_value_set_int (&value, bottom);
GST_DEBUG_OBJECT (aspect_ratio_crop, "set bottom cropping to: %d", bottom);
g_object_set_property (G_OBJECT (aspect_ratio_crop->videocrop), "bottom",
&value);
g_value_set_int (&value, left);
GST_DEBUG_OBJECT (aspect_ratio_crop, "set left cropping to: %d", left);
g_object_set_property (G_OBJECT (aspect_ratio_crop->videocrop), "left",
&value);
g_value_unset (&value);
}
static gboolean
gst_aspect_ratio_crop_set_caps (GstPad * pad, GstCaps * caps)
{
GstAspectRatioCrop *aspect_ratio_crop;
GstPad *peer_pad;
GstStructure *structure;
gboolean ret;
aspect_ratio_crop = GST_ASPECT_RATIO_CROP (gst_pad_get_parent (pad));
g_mutex_lock (aspect_ratio_crop->crop_lock);
structure = gst_caps_get_structure (caps, 0);
gst_aspect_ratio_transform_structure (aspect_ratio_crop, structure, NULL,
TRUE);
peer_pad =
gst_element_get_static_pad (GST_ELEMENT (aspect_ratio_crop->videocrop),
"sink");
ret = gst_pad_set_caps (peer_pad, caps);
gst_object_unref (peer_pad);
gst_object_unref (aspect_ratio_crop);
g_mutex_unlock (aspect_ratio_crop->crop_lock);
return ret;
}
static void
gst_aspect_ratio_crop_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (element_class, &aspect_ratio_crop_details);
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));
}
static void
gst_aspect_ratio_crop_class_init (GstAspectRatioCropClass * klass)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass *) klass;
gobject_class->set_property = gst_aspect_ratio_crop_set_property;
gobject_class->get_property = gst_aspect_ratio_crop_get_property;
gobject_class->finalize = gst_aspect_ratio_crop_finalize;
g_object_class_install_property (gobject_class, ARG_ASPECT_RATIO_CROP,
gst_param_spec_fraction ("aspect-ratio", "aspect-ratio",
"Target aspect-ratio of video", 0, 1, G_MAXINT, 1, 0, 1,
G_PARAM_READWRITE));
}
static void
gst_aspect_ratio_crop_finalize (GObject * object)
{
GstAspectRatioCrop *aspect_ratio_crop;
aspect_ratio_crop = GST_ASPECT_RATIO_CROP (object);
if (aspect_ratio_crop->crop_lock)
g_mutex_free (aspect_ratio_crop->crop_lock);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_aspect_ratio_crop_init (GstAspectRatioCrop * aspect_ratio_crop,
GstAspectRatioCropClass * klass)
{
GstPad *link_pad;
GstPad *src_pad;
GST_DEBUG_CATEGORY_INIT (aspect_ratio_crop_debug, "aspectratiocrop", 0,
"aspectratiocrop");
aspect_ratio_crop->ar_num = 0;
aspect_ratio_crop->ar_denom = 1;
aspect_ratio_crop->crop_lock = g_mutex_new ();
/* add the transform element */
aspect_ratio_crop->videocrop = gst_element_factory_make ("videocrop", NULL);
gst_bin_add (GST_BIN (aspect_ratio_crop), aspect_ratio_crop->videocrop);
/* create ghost pad src */
link_pad =
gst_element_get_static_pad (GST_ELEMENT (aspect_ratio_crop->videocrop),
"src");
src_pad = gst_ghost_pad_new ("src", link_pad);
gst_pad_set_getcaps_function (src_pad,
GST_DEBUG_FUNCPTR (gst_aspect_ratio_crop_get_caps));
gst_element_add_pad (GST_ELEMENT (aspect_ratio_crop), src_pad);
gst_object_unref (link_pad);
/* create ghost pad sink */
link_pad =
gst_element_get_static_pad (GST_ELEMENT (aspect_ratio_crop->videocrop),
"sink");
aspect_ratio_crop->sink = gst_ghost_pad_new ("sink", link_pad);
gst_element_add_pad (GST_ELEMENT (aspect_ratio_crop),
aspect_ratio_crop->sink);
gst_object_unref (link_pad);
gst_pad_set_setcaps_function (aspect_ratio_crop->sink,
GST_DEBUG_FUNCPTR (gst_aspect_ratio_crop_set_caps));
}
static void
gst_aspect_ratio_transform_structure (GstAspectRatioCrop * aspect_ratio_crop,
GstStructure * structure, GstStructure ** new_structure,
gboolean set_videocrop)
{
gdouble incoming_ar;
gdouble requested_ar;
gint width, height;
gint cropvalue;
gint par_d, par_n;
/* Check if we need to change the aspect ratio */
if (aspect_ratio_crop->ar_num < 1) {
GST_DEBUG_OBJECT (aspect_ratio_crop, "No cropping requested");
goto beach;
}
/* get the information from the caps */
if (!gst_structure_get_int (structure, "width", &width) ||
!gst_structure_get_int (structure, "height", &height))
goto beach;
if (!gst_structure_get_fraction (structure, "pixel-aspect-ratio",
&par_n, &par_d)) {
par_d = par_n = 1;
}
incoming_ar = ((gdouble) (width * par_n)) / (height * par_d);
GST_LOG_OBJECT (aspect_ratio_crop,
"incoming caps width(%d), height(%d), par (%d/%d) : ar = %f", width,
height, par_n, par_d, incoming_ar);
requested_ar =
(gdouble) aspect_ratio_crop->ar_num / aspect_ratio_crop->ar_denom;
/* check if the original aspect-ratio is the aspect-ratio that we want */
if (requested_ar == incoming_ar) {
GST_DEBUG_OBJECT (aspect_ratio_crop,
"Input video already has the correct aspect ratio (%.3f == %.3f)",
incoming_ar, requested_ar);
goto beach;
} else if (requested_ar > incoming_ar) {
/* fix aspect ratio with cropping on top and bottom */
cropvalue =
((((double) aspect_ratio_crop->ar_denom /
(double) (aspect_ratio_crop->ar_num)) * ((double) par_n /
(double) par_d) * width) - height) / 2;
if (cropvalue < 0) {
cropvalue *= -1;
}
if (cropvalue >= (height / 2))
goto crop_failed;
if (set_videocrop) {
gst_aspect_ratio_crop_set_cropping (aspect_ratio_crop, cropvalue, 0,
cropvalue, 0);
}
if (new_structure) {
*new_structure = gst_structure_copy (structure);
gst_structure_set (*new_structure,
"height", G_TYPE_INT, (int) (height - (cropvalue * 2)), NULL);
}
} else {
/* fix aspect ratio with cropping on left and right */
cropvalue =
((((double) aspect_ratio_crop->ar_num /
(double) (aspect_ratio_crop->ar_denom)) * ((double) par_d /
(double) par_n) * height) - width) / 2;
if (cropvalue < 0) {
cropvalue *= -1;
}
if (cropvalue >= (width / 2))
goto crop_failed;
if (set_videocrop) {
gst_aspect_ratio_crop_set_cropping (aspect_ratio_crop, 0, cropvalue,
0, cropvalue);
}
if (new_structure) {
*new_structure = gst_structure_copy (structure);
gst_structure_set (*new_structure,
"width", G_TYPE_INT, (int) (width - (cropvalue * 2)), NULL);
}
}
return;
crop_failed:
GST_WARNING_OBJECT (aspect_ratio_crop,
"can't crop to aspect ratio requested");
goto beach;
beach:
if (set_videocrop) {
gst_aspect_ratio_crop_set_cropping (aspect_ratio_crop, 0, 0, 0, 0);
}
if (new_structure) {
*new_structure = gst_structure_copy (structure);
}
}
static GstCaps *
gst_aspect_ratio_crop_transform_caps (GstAspectRatioCrop * aspect_ratio_crop,
GstCaps * caps)
{
GstCaps *transform;
gint size, i;
transform = gst_caps_new_empty ();
size = gst_caps_get_size (caps);
for (i = 0; i < size; i++) {
GstStructure *s;
GstStructure *trans_s;
s = gst_caps_get_structure (caps, i);
gst_aspect_ratio_transform_structure (aspect_ratio_crop, s, &trans_s,
FALSE);
gst_caps_append_structure (transform, trans_s);
}
return transform;
}
static GstCaps *
gst_aspect_ratio_crop_get_caps (GstPad * pad)
{
GstPad *peer;
GstAspectRatioCrop *aspect_ratio_crop;
GstCaps *return_caps;
aspect_ratio_crop = GST_ASPECT_RATIO_CROP (gst_pad_get_parent (pad));
g_mutex_lock (aspect_ratio_crop->crop_lock);
peer = gst_pad_get_peer (aspect_ratio_crop->sink);
if (peer == NULL) {
return_caps = gst_static_pad_template_get_caps (&src_template);
gst_caps_ref (return_caps);
} else {
GstCaps *peer_caps;
peer_caps = gst_pad_get_caps (peer);
return_caps =
gst_aspect_ratio_crop_transform_caps (aspect_ratio_crop, peer_caps);
gst_caps_unref (peer_caps);
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gst_object_unref (peer);
}
g_mutex_unlock (aspect_ratio_crop->crop_lock);
gst_object_unref (aspect_ratio_crop);
return return_caps;
}
static void
gst_aspect_ratio_crop_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstAspectRatioCrop *aspect_ratio_crop;
gboolean recheck = FALSE;
aspect_ratio_crop = GST_ASPECT_RATIO_CROP (object);
GST_OBJECT_LOCK (aspect_ratio_crop);
switch (prop_id) {
case ARG_ASPECT_RATIO_CROP:
if (GST_VALUE_HOLDS_FRACTION (value)) {
aspect_ratio_crop->ar_num = gst_value_get_fraction_numerator (value);
aspect_ratio_crop->ar_denom =
gst_value_get_fraction_denominator (value);
recheck = (GST_PAD_CAPS (aspect_ratio_crop->sink) != NULL);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (aspect_ratio_crop);
if (recheck) {
gst_aspect_ratio_crop_set_caps (aspect_ratio_crop->sink,
GST_PAD_CAPS (aspect_ratio_crop->sink));
}
}
static void
gst_aspect_ratio_crop_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstAspectRatioCrop *aspect_ratio_crop;
aspect_ratio_crop = GST_ASPECT_RATIO_CROP (object);
GST_OBJECT_LOCK (aspect_ratio_crop);
switch (prop_id) {
case ARG_ASPECT_RATIO_CROP:
gst_value_set_fraction (value, aspect_ratio_crop->ar_num,
aspect_ratio_crop->ar_denom);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (aspect_ratio_crop);
}