gstreamer/subprojects/gst-editing-services/ges/gesvideoscale.c
Thibault Saunier 14d6773aba ges: framepositioner: Expose positioning properties as doubles
Making it possible to properly handle compositors that have those
properties as doubles and handle antialiasing.

Internally we were handling those values as doubles in framepositioner,
so expose new properties so user can set values as doubles also.

This changes the GESFramePositionMeta API but we are still on time for 1.24

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6241>
2024-02-29 00:56:30 +00:00

176 lines
4.9 KiB
C

/* GStreamer
* Copyright (C) 2023 Thibault Saunier <tsaunier@igalia.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., 51 Franklin Street, Suite 500,
* Boston, MA 02110-1335, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <math.h>
#include "ges-frame-composition-meta.h"
typedef struct _GESVideoScale GESVideoScale;
typedef struct
{
GstBinClass parent_class;
} GESVideoScaleClass;
struct _GESVideoScale
{
GstBin parent;
GstPad *sink;
GstElement *capsfilter;
gint width, height;
};
/* *INDENT-OFF* */
static GstStaticPadTemplate gst_video_scale_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("ANY")
);
static GstStaticPadTemplate gst_video_scale_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("ANY")
);
GES_DECLARE_TYPE (VideoScale, video_scale, VIDEO_SCALE)
G_DEFINE_TYPE (GESVideoScale, ges_video_scale, GST_TYPE_BIN);
/* *INDENT-ON* */
static void
set_dimension (GESVideoScale * self, gint width, gint height)
{
GstCaps *caps = gst_caps_new_simple ("video/x-raw",
"pixel-aspect-ratio", GST_TYPE_FRACTION, 1, 1,
NULL);
if (width >= 0)
gst_caps_set_simple (caps, "width", G_TYPE_INT, width, NULL);
if (height >= 0)
gst_caps_set_simple (caps, "height", G_TYPE_INT, height, NULL);
gst_caps_set_features (caps, 0, gst_caps_features_new_any ());
g_object_set (self->capsfilter, "caps", caps, NULL);
gst_caps_unref (caps);
GST_OBJECT_LOCK (self);
self->width = width;
self->height = height;
GST_OBJECT_UNLOCK (self);
}
static GstFlowReturn
chain (GstPad * pad, GESVideoScale * self, GstBuffer * buffer)
{
GESFrameCompositionMeta *meta;
meta =
(GESFrameCompositionMeta *) gst_buffer_get_meta (buffer,
ges_frame_composition_meta_api_get_type ());
if (meta) {
GST_OBJECT_LOCK (self);
if (meta->height != self->height || meta->width != self->width) {
GST_OBJECT_UNLOCK (self);
set_dimension (self, (gint) round (meta->width),
(gint) round (meta->height));
} else {
GST_OBJECT_UNLOCK (self);
}
meta->height = meta->width = -1;
}
return gst_proxy_pad_chain_default (pad, GST_OBJECT (self), buffer);
}
static GstStateChangeReturn
change_state (GstElement * element, GstStateChange transition)
{
GESVideoScale *self = GES_VIDEO_SCALE (element);
GstStateChangeReturn res =
((GstElementClass *) ges_video_scale_parent_class)->change_state (element,
transition);
if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) {
GST_OBJECT_LOCK (self);
self->width = 0;
self->height = 0;
GST_OBJECT_UNLOCK (self);
}
return res;
}
static void
ges_video_scale_init (GESVideoScale * self)
{
GstPad *pad;
GstElement *scale;
GstPadTemplate *template =
gst_static_pad_template_get (&gst_video_scale_sink_template);
scale = gst_element_factory_make ("videoscale", NULL);
g_object_set (scale, "add-borders", FALSE, NULL);
self->capsfilter = gst_element_factory_make ("capsfilter", NULL);
gst_bin_add_many (GST_BIN (self), scale, self->capsfilter, NULL);
gst_element_link (scale, self->capsfilter);
self->sink =
gst_ghost_pad_new_from_template ("sink", scale->sinkpads->data, template);
gst_pad_set_chain_function (self->sink, (GstPadChainFunction) chain);
gst_element_add_pad (GST_ELEMENT (self), self->sink);
gst_object_unref (template);
template = gst_static_pad_template_get (&gst_video_scale_src_template);
pad =
gst_ghost_pad_new_from_template ("src", self->capsfilter->srcpads->data,
template);
gst_element_add_pad (GST_ELEMENT (self), pad);
gst_object_unref (template);
}
static void
ges_video_scale_class_init (GESVideoScaleClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_set_static_metadata (element_class,
"VideoScale",
"Video/Filter",
"Scaling element usable as a GES effect",
"Thibault Saunier <tsaunier@igalia.com>");
gst_element_class_add_static_pad_template (element_class,
&gst_video_scale_sink_template);
gst_element_class_add_static_pad_template (element_class,
&gst_video_scale_src_template);
element_class->change_state = change_state;
}