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453 lines
14 KiB
C
453 lines
14 KiB
C
/* GStreamer video frame cropping to aspect-ratio
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* Copyright (C) 2009 Thijs Vermeir <thijsvermeir@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:element-aspectratiocrop
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* @see_also: #GstVideoCrop
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*
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* This element crops video frames to a specified #GstAspectRatioCrop:aspect-ratio.
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*
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* If the aspect-ratio is already correct, the element will operate
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* in pass-through mode.
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*
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* <refsect2>
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* <title>Example launch line</title>
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* |[
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* gst-launch -v videotestsrc ! video/x-raw-rgb,height=640,width=480 ! aspectratiocrop aspect-ratio=16/9 ! ximagesink
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* ]| This pipeline generates a videostream in 4/3 and crops it to 16/9.
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* </refsect2>
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/gst.h>
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#include <gst/video/video.h>
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#include "gstaspectratiocrop.h"
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GST_DEBUG_CATEGORY_STATIC (aspect_ratio_crop_debug);
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#define GST_CAT_DEFAULT aspect_ratio_crop_debug
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enum
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{
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ARG_0,
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ARG_ASPECT_RATIO_CROP,
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};
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/* we support the same caps as videocrop */
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#define ASPECT_RATIO_CROP_CAPS \
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GST_VIDEO_CAPS_RGBx ";" \
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GST_VIDEO_CAPS_xRGB ";" \
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GST_VIDEO_CAPS_BGRx ";" \
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GST_VIDEO_CAPS_xBGR ";" \
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GST_VIDEO_CAPS_RGBA ";" \
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GST_VIDEO_CAPS_ARGB ";" \
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GST_VIDEO_CAPS_BGRA ";" \
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GST_VIDEO_CAPS_ABGR ";" \
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GST_VIDEO_CAPS_RGB ";" \
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GST_VIDEO_CAPS_BGR ";" \
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GST_VIDEO_CAPS_YUV ("AYUV") ";" \
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GST_VIDEO_CAPS_YUV ("YUY2") ";" \
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GST_VIDEO_CAPS_YUV ("YVYU") ";" \
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GST_VIDEO_CAPS_YUV ("UYVY") ";" \
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GST_VIDEO_CAPS_YUV ("Y800") ";" \
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GST_VIDEO_CAPS_YUV ("I420") ";" \
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GST_VIDEO_CAPS_YUV ("YV12") ";" \
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GST_VIDEO_CAPS_RGB_16 ";" \
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GST_VIDEO_CAPS_RGB_15
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static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (ASPECT_RATIO_CROP_CAPS)
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);
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static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (ASPECT_RATIO_CROP_CAPS)
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);
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GST_BOILERPLATE (GstAspectRatioCrop, gst_aspect_ratio_crop, GstBin,
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GST_TYPE_BIN);
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static void gst_aspect_ratio_crop_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_aspect_ratio_crop_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static void gst_aspect_ratio_crop_set_cropping (GstAspectRatioCrop *
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aspect_ratio_crop, gint top, gint right, gint bottom, gint left);
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static GstCaps *gst_aspect_ratio_crop_get_caps (GstPad * pad);
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static gboolean gst_aspect_ratio_crop_set_caps (GstPad * pad, GstCaps * caps);
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static void gst_aspect_ratio_crop_finalize (GObject * object);
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static void gst_aspect_ratio_transform_structure (GstAspectRatioCrop *
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aspect_ratio_crop, GstStructure * structure, GstStructure ** new_structure,
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gboolean set_videocrop);
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static void
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gst_aspect_ratio_crop_set_cropping (GstAspectRatioCrop * aspect_ratio_crop,
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gint top, gint right, gint bottom, gint left)
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{
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GValue value = { 0 };
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if (G_UNLIKELY (!aspect_ratio_crop->videocrop)) {
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GST_WARNING_OBJECT (aspect_ratio_crop,
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"Can't set the settings if there is no cropping element");
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return;
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}
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g_value_init (&value, G_TYPE_INT);
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g_value_set_int (&value, top);
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GST_DEBUG_OBJECT (aspect_ratio_crop, "set top cropping to: %d", top);
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g_object_set_property (G_OBJECT (aspect_ratio_crop->videocrop), "top",
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&value);
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g_value_set_int (&value, right);
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GST_DEBUG_OBJECT (aspect_ratio_crop, "set right cropping to: %d", right);
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g_object_set_property (G_OBJECT (aspect_ratio_crop->videocrop), "right",
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&value);
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g_value_set_int (&value, bottom);
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GST_DEBUG_OBJECT (aspect_ratio_crop, "set bottom cropping to: %d", bottom);
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g_object_set_property (G_OBJECT (aspect_ratio_crop->videocrop), "bottom",
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&value);
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g_value_set_int (&value, left);
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GST_DEBUG_OBJECT (aspect_ratio_crop, "set left cropping to: %d", left);
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g_object_set_property (G_OBJECT (aspect_ratio_crop->videocrop), "left",
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&value);
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g_value_unset (&value);
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}
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static gboolean
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gst_aspect_ratio_crop_set_caps (GstPad * pad, GstCaps * caps)
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{
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GstAspectRatioCrop *aspect_ratio_crop;
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GstPad *peer_pad;
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GstStructure *structure;
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gboolean ret;
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aspect_ratio_crop = GST_ASPECT_RATIO_CROP (gst_pad_get_parent (pad));
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g_mutex_lock (aspect_ratio_crop->crop_lock);
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structure = gst_caps_get_structure (caps, 0);
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gst_aspect_ratio_transform_structure (aspect_ratio_crop, structure, NULL,
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TRUE);
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peer_pad =
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gst_element_get_static_pad (GST_ELEMENT (aspect_ratio_crop->videocrop),
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"sink");
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ret = gst_pad_set_caps (peer_pad, caps);
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gst_object_unref (peer_pad);
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gst_object_unref (aspect_ratio_crop);
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g_mutex_unlock (aspect_ratio_crop->crop_lock);
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return ret;
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}
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static void
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gst_aspect_ratio_crop_base_init (gpointer g_class)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_set_details_simple (element_class, "aspectratiocrop",
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"Filter/Effect/Video",
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"Crops video into a user-defined aspect-ratio",
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"Thijs Vermeir <thijsvermeir@gmail.com>");
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&sink_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&src_template));
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}
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static void
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gst_aspect_ratio_crop_class_init (GstAspectRatioCropClass * klass)
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{
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GObjectClass *gobject_class;
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gobject_class = (GObjectClass *) klass;
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gobject_class->set_property = gst_aspect_ratio_crop_set_property;
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gobject_class->get_property = gst_aspect_ratio_crop_get_property;
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gobject_class->finalize = gst_aspect_ratio_crop_finalize;
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g_object_class_install_property (gobject_class, ARG_ASPECT_RATIO_CROP,
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gst_param_spec_fraction ("aspect-ratio", "aspect-ratio",
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"Target aspect-ratio of video", 0, 1, G_MAXINT, 1, 0, 1,
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G_PARAM_READWRITE));
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}
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static void
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gst_aspect_ratio_crop_finalize (GObject * object)
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{
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GstAspectRatioCrop *aspect_ratio_crop;
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aspect_ratio_crop = GST_ASPECT_RATIO_CROP (object);
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if (aspect_ratio_crop->crop_lock)
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g_mutex_free (aspect_ratio_crop->crop_lock);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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gst_aspect_ratio_crop_init (GstAspectRatioCrop * aspect_ratio_crop,
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GstAspectRatioCropClass * klass)
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{
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GstPad *link_pad;
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GstPad *src_pad;
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GST_DEBUG_CATEGORY_INIT (aspect_ratio_crop_debug, "aspectratiocrop", 0,
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"aspectratiocrop");
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aspect_ratio_crop->ar_num = 0;
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aspect_ratio_crop->ar_denom = 1;
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aspect_ratio_crop->crop_lock = g_mutex_new ();
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/* add the transform element */
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aspect_ratio_crop->videocrop = gst_element_factory_make ("videocrop", NULL);
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gst_bin_add (GST_BIN (aspect_ratio_crop), aspect_ratio_crop->videocrop);
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/* create ghost pad src */
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link_pad =
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gst_element_get_static_pad (GST_ELEMENT (aspect_ratio_crop->videocrop),
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"src");
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src_pad = gst_ghost_pad_new ("src", link_pad);
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gst_pad_set_getcaps_function (src_pad,
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GST_DEBUG_FUNCPTR (gst_aspect_ratio_crop_get_caps));
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gst_element_add_pad (GST_ELEMENT (aspect_ratio_crop), src_pad);
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gst_object_unref (link_pad);
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/* create ghost pad sink */
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link_pad =
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gst_element_get_static_pad (GST_ELEMENT (aspect_ratio_crop->videocrop),
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"sink");
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aspect_ratio_crop->sink = gst_ghost_pad_new ("sink", link_pad);
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gst_element_add_pad (GST_ELEMENT (aspect_ratio_crop),
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aspect_ratio_crop->sink);
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gst_object_unref (link_pad);
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gst_pad_set_setcaps_function (aspect_ratio_crop->sink,
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GST_DEBUG_FUNCPTR (gst_aspect_ratio_crop_set_caps));
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}
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static void
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gst_aspect_ratio_transform_structure (GstAspectRatioCrop * aspect_ratio_crop,
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GstStructure * structure, GstStructure ** new_structure,
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gboolean set_videocrop)
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{
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gdouble incoming_ar;
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gdouble requested_ar;
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gint width, height;
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gint cropvalue;
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gint par_d, par_n;
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/* Check if we need to change the aspect ratio */
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if (aspect_ratio_crop->ar_num < 1) {
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GST_DEBUG_OBJECT (aspect_ratio_crop, "No cropping requested");
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goto beach;
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}
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/* get the information from the caps */
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if (!gst_structure_get_int (structure, "width", &width) ||
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!gst_structure_get_int (structure, "height", &height))
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goto beach;
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if (!gst_structure_get_fraction (structure, "pixel-aspect-ratio",
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&par_n, &par_d)) {
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par_d = par_n = 1;
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}
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incoming_ar = ((gdouble) (width * par_n)) / (height * par_d);
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GST_LOG_OBJECT (aspect_ratio_crop,
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"incoming caps width(%d), height(%d), par (%d/%d) : ar = %f", width,
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height, par_n, par_d, incoming_ar);
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requested_ar =
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(gdouble) aspect_ratio_crop->ar_num / aspect_ratio_crop->ar_denom;
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/* check if the original aspect-ratio is the aspect-ratio that we want */
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if (requested_ar == incoming_ar) {
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GST_DEBUG_OBJECT (aspect_ratio_crop,
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"Input video already has the correct aspect ratio (%.3f == %.3f)",
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incoming_ar, requested_ar);
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goto beach;
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} else if (requested_ar > incoming_ar) {
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/* fix aspect ratio with cropping on top and bottom */
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cropvalue =
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((((double) aspect_ratio_crop->ar_denom /
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(double) (aspect_ratio_crop->ar_num)) * ((double) par_n /
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(double) par_d) * width) - height) / 2;
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if (cropvalue < 0) {
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cropvalue *= -1;
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}
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if (cropvalue >= (height / 2))
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goto crop_failed;
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if (set_videocrop) {
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gst_aspect_ratio_crop_set_cropping (aspect_ratio_crop, cropvalue, 0,
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cropvalue, 0);
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}
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if (new_structure) {
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*new_structure = gst_structure_copy (structure);
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gst_structure_set (*new_structure,
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"height", G_TYPE_INT, (int) (height - (cropvalue * 2)), NULL);
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}
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} else {
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/* fix aspect ratio with cropping on left and right */
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cropvalue =
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((((double) aspect_ratio_crop->ar_num /
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(double) (aspect_ratio_crop->ar_denom)) * ((double) par_d /
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(double) par_n) * height) - width) / 2;
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if (cropvalue < 0) {
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cropvalue *= -1;
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}
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if (cropvalue >= (width / 2))
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goto crop_failed;
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if (set_videocrop) {
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gst_aspect_ratio_crop_set_cropping (aspect_ratio_crop, 0, cropvalue,
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0, cropvalue);
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}
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if (new_structure) {
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*new_structure = gst_structure_copy (structure);
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gst_structure_set (*new_structure,
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"width", G_TYPE_INT, (int) (width - (cropvalue * 2)), NULL);
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}
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}
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return;
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crop_failed:
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GST_WARNING_OBJECT (aspect_ratio_crop,
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"can't crop to aspect ratio requested");
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goto beach;
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beach:
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if (set_videocrop) {
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gst_aspect_ratio_crop_set_cropping (aspect_ratio_crop, 0, 0, 0, 0);
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}
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if (new_structure) {
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*new_structure = gst_structure_copy (structure);
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}
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}
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static GstCaps *
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gst_aspect_ratio_crop_transform_caps (GstAspectRatioCrop * aspect_ratio_crop,
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GstCaps * caps)
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{
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GstCaps *transform;
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gint size, i;
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transform = gst_caps_new_empty ();
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size = gst_caps_get_size (caps);
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for (i = 0; i < size; i++) {
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GstStructure *s;
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GstStructure *trans_s;
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s = gst_caps_get_structure (caps, i);
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gst_aspect_ratio_transform_structure (aspect_ratio_crop, s, &trans_s,
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FALSE);
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gst_caps_append_structure (transform, trans_s);
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}
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return transform;
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}
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static GstCaps *
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gst_aspect_ratio_crop_get_caps (GstPad * pad)
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{
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GstPad *peer;
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GstAspectRatioCrop *aspect_ratio_crop;
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GstCaps *return_caps;
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aspect_ratio_crop = GST_ASPECT_RATIO_CROP (gst_pad_get_parent (pad));
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g_mutex_lock (aspect_ratio_crop->crop_lock);
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peer = gst_pad_get_peer (aspect_ratio_crop->sink);
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if (peer == NULL) {
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return_caps = gst_static_pad_template_get_caps (&src_template);
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gst_caps_ref (return_caps);
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} else {
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GstCaps *peer_caps;
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peer_caps = gst_pad_get_caps (peer);
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return_caps =
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gst_aspect_ratio_crop_transform_caps (aspect_ratio_crop, peer_caps);
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gst_caps_unref (peer_caps);
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gst_object_unref (peer);
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}
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g_mutex_unlock (aspect_ratio_crop->crop_lock);
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gst_object_unref (aspect_ratio_crop);
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return return_caps;
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}
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static void
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gst_aspect_ratio_crop_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstAspectRatioCrop *aspect_ratio_crop;
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gboolean recheck = FALSE;
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aspect_ratio_crop = GST_ASPECT_RATIO_CROP (object);
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GST_OBJECT_LOCK (aspect_ratio_crop);
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switch (prop_id) {
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case ARG_ASPECT_RATIO_CROP:
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if (GST_VALUE_HOLDS_FRACTION (value)) {
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aspect_ratio_crop->ar_num = gst_value_get_fraction_numerator (value);
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aspect_ratio_crop->ar_denom =
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gst_value_get_fraction_denominator (value);
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recheck = (GST_PAD_CAPS (aspect_ratio_crop->sink) != NULL);
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}
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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GST_OBJECT_UNLOCK (aspect_ratio_crop);
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if (recheck) {
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gst_aspect_ratio_crop_set_caps (aspect_ratio_crop->sink,
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GST_PAD_CAPS (aspect_ratio_crop->sink));
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}
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}
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static void
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gst_aspect_ratio_crop_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstAspectRatioCrop *aspect_ratio_crop;
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aspect_ratio_crop = GST_ASPECT_RATIO_CROP (object);
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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);
|
|
}
|