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386 lines
11 KiB
C
386 lines
11 KiB
C
/*
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* GStreamer
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* Copyright (C) 2015 Thiago Santos <thiagoss@osg.samsung.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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-digitalzoom
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* @title: digitalzoom
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*
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* Does digital zooming by cropping and scaling an image.
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*
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* It is a bin that contains the internal pipeline:
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* videocrop ! videoscale ! capsfilter
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*
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* It keeps monitoring the input caps and when it is set/updated
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* the capsfilter gets set the same caps to guarantee that the same
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* input resolution is provided as output.
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*
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* Exposes the 'zoom' property as a float to allow setting the amount
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* of zoom desired. Zooming is done in the center.
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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-i18n-plugin.h>
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#include "gstdigitalzoom.h"
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enum
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{
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PROP_0,
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PROP_ZOOM
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};
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GST_DEBUG_CATEGORY (digital_zoom_debug);
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#define GST_CAT_DEFAULT digital_zoom_debug
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#define gst_digital_zoom_parent_class parent_class
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G_DEFINE_TYPE (GstDigitalZoom, gst_digital_zoom, GST_TYPE_BIN);
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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_ANY);
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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_ANY);
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static void
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gst_digital_zoom_update_crop (GstDigitalZoom * self, GstCaps * caps)
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{
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gint w2_crop = 0, h2_crop = 0;
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gint left = 0;
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gint right = 0;
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gint top = 0;
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gint bottom = 0;
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gint width, height;
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gfloat zoom;
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GstStructure *structure;
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if (caps == NULL || gst_caps_is_any (caps)) {
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g_object_set (self->capsfilter, "caps", NULL, NULL);
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return;
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}
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structure = gst_caps_get_structure (caps, 0);
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gst_structure_get (structure, "width", G_TYPE_INT, &width, "height",
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G_TYPE_INT, &height, NULL);
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zoom = self->zoom;
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if (self->videocrop) {
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/* Update capsfilters to apply the zoom */
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GST_INFO_OBJECT (self, "zoom: %f, orig size: %dx%d", zoom, width, height);
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if (zoom != 1.0) {
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w2_crop = (width - (gint) (width * 1.0 / zoom)) / 2;
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h2_crop = (height - (gint) (height * 1.0 / zoom)) / 2;
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left += w2_crop;
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right += w2_crop;
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top += h2_crop;
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bottom += h2_crop;
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/* force number of pixels cropped from left to be even, to avoid slow code
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* path on videoscale */
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left &= 0xFFFE;
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}
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GST_INFO_OBJECT (self,
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"sw cropping: left:%d, right:%d, top:%d, bottom:%d", left, right, top,
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bottom);
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g_object_set (self->videocrop, "left", left, "right", right, "top",
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top, "bottom", bottom, NULL);
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}
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}
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static void
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gst_digital_zoom_update_zoom (GstDigitalZoom * self)
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{
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GstCaps *caps = NULL;
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if (!self->elements_created)
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return;
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g_object_get (self->capsfilter, "caps", &caps, NULL);
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if (caps) {
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gst_digital_zoom_update_crop (self, caps);
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gst_caps_unref (caps);
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}
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}
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static void
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gst_digital_zoom_set_property (GObject * object,
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guint prop_id, const GValue * value, GParamSpec * pspec)
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{
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GstDigitalZoom *self = GST_DIGITAL_ZOOM_CAST (object);
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switch (prop_id) {
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case PROP_ZOOM:
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self->zoom = g_value_get_float (value);
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GST_DEBUG_OBJECT (self, "Setting zoom: %f", self->zoom);
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gst_digital_zoom_update_zoom (self);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (self, prop_id, pspec);
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break;
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}
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}
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static void
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gst_digital_zoom_get_property (GObject * object,
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guint prop_id, GValue * value, GParamSpec * pspec)
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{
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GstDigitalZoom *self = GST_DIGITAL_ZOOM_CAST (object);
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switch (prop_id) {
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case PROP_ZOOM:
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g_value_set_float (value, self->zoom);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (self, prop_id, pspec);
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break;
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}
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}
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static gboolean
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gst_digital_zoom_sink_query (GstPad * sink, GstObject * parent,
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GstQuery * query)
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{
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GstDigitalZoom *self = GST_DIGITAL_ZOOM_CAST (parent);
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switch (GST_QUERY_TYPE (query)) {
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/* for caps related queries we want to skip videocrop ! videoscale
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* as the digital zoom preserves input dimensions */
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case GST_QUERY_CAPS:
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case GST_QUERY_ACCEPT_CAPS:
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if (self->elements_created)
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return gst_pad_peer_query (self->srcpad, query);
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/* fall through */
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default:
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return gst_pad_query_default (sink, parent, query);
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}
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}
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static gboolean
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gst_digital_zoom_src_query (GstPad * sink, GstObject * parent, GstQuery * query)
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{
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GstDigitalZoom *self = GST_DIGITAL_ZOOM_CAST (parent);
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switch (GST_QUERY_TYPE (query)) {
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/* for caps related queries we want to skip videocrop ! videoscale
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* as the digital zoom preserves input dimensions */
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case GST_QUERY_CAPS:
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case GST_QUERY_ACCEPT_CAPS:
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if (self->elements_created)
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return gst_pad_peer_query (self->sinkpad, query);
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/* fall through */
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default:
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return gst_pad_query_default (sink, parent, query);
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}
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}
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static gboolean
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gst_digital_zoom_sink_event (GstPad * sink, GstObject * parent,
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GstEvent * event)
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{
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gboolean ret;
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gboolean is_caps;
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GstDigitalZoom *self = GST_DIGITAL_ZOOM_CAST (parent);
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GstCaps *old_caps = NULL;
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GstCaps *caps = NULL;
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is_caps = GST_EVENT_TYPE (event) == GST_EVENT_CAPS;
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if (is_caps) {
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gst_event_parse_caps (event, &caps);
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g_object_get (self->capsfilter, "caps", &old_caps, NULL);
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g_object_set (self->capsfilter, "caps", caps, NULL);
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gst_digital_zoom_update_crop (self, caps);
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}
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ret = gst_pad_event_default (sink, parent, event);
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if (is_caps) {
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if (!ret) {
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gst_digital_zoom_update_crop (self, old_caps);
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g_object_set (self->capsfilter, "caps", old_caps, NULL);
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}
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if (old_caps)
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gst_caps_unref (old_caps);
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}
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return ret;
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}
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static void
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gst_digital_zoom_dispose (GObject * object)
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{
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GstDigitalZoom *self = GST_DIGITAL_ZOOM_CAST (object);
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if (self->capsfilter_sinkpad) {
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gst_object_unref (self->capsfilter_sinkpad);
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self->capsfilter_sinkpad = NULL;
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}
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G_OBJECT_CLASS (parent_class)->dispose (object);
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}
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static void
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gst_digital_zoom_init (GstDigitalZoom * self)
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{
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GstPadTemplate *tmpl;
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tmpl = gst_static_pad_template_get (&src_template);
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self->srcpad = gst_ghost_pad_new_no_target_from_template ("src", tmpl);
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gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
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gst_object_unref (tmpl);
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tmpl = gst_static_pad_template_get (&sink_template);
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self->sinkpad = gst_ghost_pad_new_no_target_from_template ("sink", tmpl);
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gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
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gst_object_unref (tmpl);
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gst_pad_set_event_function (self->sinkpad,
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GST_DEBUG_FUNCPTR (gst_digital_zoom_sink_event));
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gst_pad_set_query_function (self->sinkpad,
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GST_DEBUG_FUNCPTR (gst_digital_zoom_sink_query));
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gst_pad_set_query_function (self->srcpad,
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GST_DEBUG_FUNCPTR (gst_digital_zoom_src_query));
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self->zoom = 1;
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}
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static GstElement *
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zoom_create_element (GstDigitalZoom * self, const gchar * element_name,
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const gchar * name)
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{
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GstElement *element;
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element = gst_element_factory_make (element_name, name);
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if (element == NULL) {
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GST_ELEMENT_ERROR (self, CORE, MISSING_PLUGIN,
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(_("Missing element '%s' - check your GStreamer installation."),
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element_name), (NULL));
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}
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return element;
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}
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static gboolean
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gst_digital_zoom_create_elements (GstDigitalZoom * self)
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{
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GstPad *pad;
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if (self->elements_created)
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return TRUE;
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self->videocrop = zoom_create_element (self, "videocrop", "zoom-videocrop");
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if (self->videocrop == NULL)
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return FALSE;
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if (!gst_bin_add (GST_BIN_CAST (self), self->videocrop))
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return FALSE;
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self->videoscale =
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zoom_create_element (self, "videoscale", "zoom-videoscale");
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if (self->videoscale == NULL)
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return FALSE;
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if (!gst_bin_add (GST_BIN_CAST (self), self->videoscale))
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return FALSE;
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self->capsfilter =
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zoom_create_element (self, "capsfilter", "zoom-capsfilter");
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if (self->capsfilter == NULL)
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return FALSE;
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if (!gst_bin_add (GST_BIN_CAST (self), self->capsfilter))
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return FALSE;
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if (!gst_element_link_pads_full (self->videocrop, "src", self->videoscale,
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"sink", GST_PAD_LINK_CHECK_CAPS))
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return FALSE;
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if (!gst_element_link_pads_full (self->videoscale, "src", self->capsfilter,
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"sink", GST_PAD_LINK_CHECK_CAPS))
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return FALSE;
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pad = gst_element_get_static_pad (self->videocrop, "sink");
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gst_ghost_pad_set_target (GST_GHOST_PAD (self->sinkpad), pad);
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gst_object_unref (pad);
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pad = gst_element_get_static_pad (self->capsfilter, "src");
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gst_ghost_pad_set_target (GST_GHOST_PAD (self->srcpad), pad);
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gst_object_unref (pad);
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self->capsfilter_sinkpad =
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gst_element_get_static_pad (self->capsfilter, "sink");
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self->elements_created = TRUE;
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return TRUE;
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}
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static GstStateChangeReturn
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gst_digital_zoom_change_state (GstElement * element, GstStateChange trans)
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{
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GstDigitalZoom *self = GST_DIGITAL_ZOOM_CAST (element);
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switch (trans) {
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case GST_STATE_CHANGE_NULL_TO_READY:
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if (!gst_digital_zoom_create_elements (self)) {
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return GST_STATE_CHANGE_FAILURE;
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}
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break;
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default:
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break;
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}
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return GST_ELEMENT_CLASS (parent_class)->change_state (element, trans);
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}
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static void
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gst_digital_zoom_class_init (GstDigitalZoomClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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gobject_class = G_OBJECT_CLASS (klass);
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gstelement_class = GST_ELEMENT_CLASS (klass);
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gobject_class->dispose = gst_digital_zoom_dispose;
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gobject_class->set_property = gst_digital_zoom_set_property;
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gobject_class->get_property = gst_digital_zoom_get_property;
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/* g_object_class_install_property .... */
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g_object_class_install_property (gobject_class, PROP_ZOOM,
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g_param_spec_float ("zoom", "Zoom",
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"Digital zoom level to be used", 1.0, G_MAXFLOAT, 1.0,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gstelement_class->change_state = gst_digital_zoom_change_state;
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GST_DEBUG_CATEGORY_INIT (digital_zoom_debug, "digitalzoom",
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0, "digital zoom");
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gst_element_class_add_static_pad_template (gstelement_class, &sink_template);
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gst_element_class_add_static_pad_template (gstelement_class, &src_template);
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gst_element_class_set_static_metadata (gstelement_class,
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"Digital zoom bin", "Generic/Video",
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"Digital zoom bin", "Thiago Santos <thiagoss@osg.samsung.com>");
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}
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