gstreamer/ges/gstframepositioner.c
Thibault Saunier 9cf986c71c framepositioner: Reposition source when the user positioned them
Keeping the same proportion in the size and position and only if
the aspect ratio is conserved.
2020-02-26 13:39:29 -03:00

718 lines
20 KiB
C

/* GStreamer
* Copyright (C) 2013 Mathieu Duponchelle <mduponchelle1@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., 51 Franklin Street, Suite 500,
* Boston, MA 02110-1335, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include <gst/gst.h>
#include <gst/video/video.h>
#include "gstframepositioner.h"
GST_DEBUG_CATEGORY_STATIC (framepositioner);
#undef GST_CAT_DEFAULT
#define GST_CAT_DEFAULT framepositioner
/* We need to define a max number of pixel so we can interpolate them */
#define MAX_PIXELS 100000
#define MIN_PIXELS -100000
static void gst_frame_positioner_set_property (GObject * object,
guint property_id, const GValue * value, GParamSpec * pspec);
static void gst_frame_positioner_get_property (GObject * object,
guint property_id, GValue * value, GParamSpec * pspec);
static GstFlowReturn gst_frame_positioner_transform_ip (GstBaseTransform *
trans, GstBuffer * buf);
static gboolean
gst_frame_positioner_meta_init (GstMeta * meta, gpointer params,
GstBuffer * buffer);
static gboolean gst_frame_positioner_meta_transform (GstBuffer * dest,
GstMeta * meta, GstBuffer * buffer, GQuark type, gpointer data);
enum
{
PROP_0,
PROP_ALPHA,
PROP_POSX,
PROP_POSY,
PROP_ZORDER,
PROP_WIDTH,
PROP_HEIGHT,
PROP_LAST,
};
static GParamSpec *properties[PROP_LAST];
static GstStaticPadTemplate gst_frame_positioner_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw")
);
static GstStaticPadTemplate gst_frame_positioner_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw")
);
G_DEFINE_TYPE (GstFramePositioner, gst_frame_positioner,
GST_TYPE_BASE_TRANSFORM);
static void
_weak_notify_cb (GstFramePositioner * pos, GObject * old)
{
pos->current_track = NULL;
}
static gboolean
is_user_positionned (GstFramePositioner * self)
{
gint i;
GParamSpec *positioning_props[] = {
properties[PROP_WIDTH],
properties[PROP_HEIGHT],
properties[PROP_POSX],
properties[PROP_POSY],
};
if (self->user_positioned)
return TRUE;
for (i = 0; i < G_N_ELEMENTS (positioning_props); i++) {
GstControlBinding *b = gst_object_get_control_binding (GST_OBJECT (self),
positioning_props[i]->name);
if (b) {
gst_object_unref (b);
return TRUE;
}
}
return FALSE;
}
static gboolean
auto_position (GstFramePositioner * self)
{
gint scaled_width = -1, scaled_height = -1, x, y;
if (is_user_positionned (self)) {
GST_DEBUG_OBJECT (self, "Was positioned by the user, not auto positioning");
return FALSE;
}
if (!self->natural_width || !self->natural_height)
return FALSE;
if (self->track_width == self->natural_width &&
self->track_height == self->natural_height)
return TRUE;
scaled_height =
gst_util_uint64_scale_int (self->natural_height, self->track_width,
self->natural_width);
scaled_width = self->track_width;
if (scaled_height > self->track_height) {
scaled_height = self->track_height;
scaled_width =
gst_util_uint64_scale_int (self->natural_width, self->track_height,
self->natural_height);
}
x = MAX (0, gst_util_uint64_scale_int_round (1,
self->track_width - scaled_width, 2));
y = MAX (0, gst_util_uint64_scale_int_round (1,
self->track_height - scaled_height, 2));
GST_INFO_OBJECT (self, "Scalling video to match track size from "
"%dx%d to %dx%d",
self->natural_width, self->natural_height, scaled_width, scaled_height);
self->width = scaled_width;
self->height = scaled_height;
self->posx = x;
self->posy = y;
return TRUE;
}
typedef struct
{
gint *value;
gint old_track_value;
gint track_value;
GParamSpec *pspec;
} RepositionPropertyData;
static void
reposition_properties (GstFramePositioner * pos, gint old_track_width,
gint old_track_height)
{
gint i;
RepositionPropertyData props_data[] = {
{&pos->width, old_track_width, pos->track_width, properties[PROP_WIDTH]},
{&pos->height, old_track_height, pos->track_height,
properties[PROP_HEIGHT]},
{&pos->posx, old_track_width, pos->track_width, properties[PROP_POSX]},
{&pos->posy, old_track_height, pos->track_height, properties[PROP_POSY]},
};
for (i = 0; i < G_N_ELEMENTS (props_data); i++) {
GList *values, *tmp;
gboolean absolute;
GstTimedValueControlSource *source = NULL;
RepositionPropertyData d = props_data[i];
GstControlBinding *binding =
gst_object_get_control_binding (GST_OBJECT (pos), d.pspec->name);
*(d.value) = gst_util_uint64_scale_int (*(d.value), d.track_value,
d.old_track_value);
if (!binding)
continue;
if (!GST_IS_DIRECT_CONTROL_BINDING (binding)) {
GST_FIXME_OBJECT (pos, "Implement support for control binding type: %s",
G_OBJECT_TYPE_NAME (binding));
goto next;
}
g_object_get (binding, "control_source", &source, NULL);
if (!GST_IS_TIMED_VALUE_CONTROL_SOURCE (source)) {
GST_FIXME_OBJECT (pos, "Implement support for control source type: %s",
G_OBJECT_TYPE_NAME (source));
goto next;
}
values =
gst_timed_value_control_source_get_all (GST_TIMED_VALUE_CONTROL_SOURCE
(source));
if (!values)
goto next;
g_object_get (binding, "absolute", &absolute, NULL);
for (tmp = values; tmp; tmp = tmp->next) {
GstTimedValue *value = tmp->data;
gst_timed_value_control_source_set (source, value->timestamp,
value->value * d.track_value / d.old_track_value);
}
g_list_free (values);
next:
gst_clear_object (&source);
gst_object_unref (binding);
}
}
static void
gst_frame_positioner_update_properties (GstFramePositioner * pos,
gboolean track_mixing, gint old_track_width, gint old_track_height)
{
GstCaps *caps;
if (pos->capsfilter == NULL)
return;
if (pos->track_width && pos->track_height &&
(!track_mixing || !pos->scale_in_compositor)) {
caps =
gst_caps_new_simple ("video/x-raw", "width", G_TYPE_INT,
pos->track_width, "height", G_TYPE_INT, pos->track_height, NULL);
} else {
caps = gst_caps_new_empty_simple ("video/x-raw");
}
if (pos->fps_n != -1)
gst_caps_set_simple (caps, "framerate", GST_TYPE_FRACTION, pos->fps_n,
pos->fps_d, NULL);
if (pos->par_n != -1)
gst_caps_set_simple (caps, "pixel-aspect-ratio", GST_TYPE_FRACTION,
pos->par_n, pos->par_d, NULL);
if (!pos->track_width || !pos->track_height) {
GST_INFO_OBJECT (pos, "Track doesn't have a proper size, not "
"positioning the source");
goto done;
} else if (auto_position (pos))
goto done;
if (!old_track_height || !old_track_height) {
GST_DEBUG_OBJECT (pos, "No old track size, can not properly reposition");
goto done;
}
if ((!pos->natural_width || !pos->natural_height) &&
(!pos->width || !pos->height)) {
GST_DEBUG_OBJECT (pos, "No natural aspect ratio and no user set "
" image size, can't not reposition.");
goto done;
}
if (gst_util_fraction_compare (old_track_width, old_track_height,
pos->track_width, pos->track_height)) {
GST_INFO_OBJECT (pos, "Not repositioning as track size change didn't"
" keep the same aspect ratio (previous %dx%d("
"ratio=%f), new: %dx%d(ratio=%f)",
old_track_width, old_track_height,
(gdouble) old_track_width / (gdouble) old_track_height,
pos->track_width, pos->track_height,
(gdouble) pos->track_width / (gdouble) pos->track_height);
goto done;
}
reposition_properties (pos, old_track_width, old_track_height);
done:
GST_DEBUG_OBJECT (caps, "setting caps");
g_object_set (pos->capsfilter, "caps", caps, NULL);
gst_caps_unref (caps);
}
static void
sync_properties_from_track (GstFramePositioner * pos, GESTrack * track)
{
gint width, height;
gint old_track_width, old_track_height;
GstCaps *caps;
g_object_get (track, "restriction-caps", &caps, NULL);
width = height = 0;
if (caps && gst_caps_get_size (caps) > 0) {
GstStructure *structure;
structure = gst_caps_get_structure (caps, 0);
if (!gst_structure_get_int (structure, "width", &width))
width = 0;
if (!gst_structure_get_int (structure, "height", &height))
height = 0;
if (!gst_structure_get_fraction (structure, "framerate", &(pos->fps_n),
&(pos->fps_d)))
pos->fps_n = -1;
if (!gst_structure_get_fraction (structure, "pixel-aspect-ratio",
&(pos->par_n), &(pos->par_d)))
pos->par_n = -1;
}
old_track_width = pos->track_width;
old_track_height = pos->track_height;
pos->track_width = width;
pos->track_height = height;
GST_DEBUG_OBJECT (pos, "syncing framerate from caps : %d/%d", pos->fps_n,
pos->fps_d);
if (caps)
gst_caps_unref (caps);
gst_frame_positioner_update_properties (pos, ges_track_get_mixing (track),
old_track_width, old_track_height);
}
static void
_track_restriction_changed_cb (GESTrack * track, GParamSpec * arg G_GNUC_UNUSED,
GstFramePositioner * pos)
{
sync_properties_from_track (pos, track);
}
static void
set_track (GstFramePositioner * pos)
{
GESTrack *new_track;
if (pos->current_track) {
g_signal_handlers_disconnect_by_func (pos->current_track,
(GCallback) _track_restriction_changed_cb, pos);
g_object_weak_unref (G_OBJECT (pos->current_track),
(GWeakNotify) _weak_notify_cb, pos);
}
new_track = ges_track_element_get_track (pos->track_source);
if (new_track) {
pos->current_track = new_track;
g_object_weak_ref (G_OBJECT (new_track), (GWeakNotify) _weak_notify_cb,
pos);
GST_DEBUG_OBJECT (pos, "connecting to track : %p", pos->current_track);
g_signal_connect (pos->current_track, "notify::restriction-caps",
(GCallback) _track_restriction_changed_cb, pos);
sync_properties_from_track (pos, pos->current_track);
} else {
pos->current_track = NULL;
}
}
static void
_track_changed_cb (GESTrackElement * trksrc, GParamSpec * arg G_GNUC_UNUSED,
GstFramePositioner * pos)
{
set_track (pos);
}
static void
_trk_element_weak_notify_cb (GstFramePositioner * pos, GObject * old)
{
pos->track_source = NULL;
gst_object_unref (pos);
}
void
ges_frame_positioner_set_source_and_filter (GstFramePositioner * pos,
GESTrackElement * trksrc, GstElement * capsfilter)
{
pos->track_source = trksrc;
pos->capsfilter = capsfilter;
pos->current_track = ges_track_element_get_track (trksrc);
g_object_weak_ref (G_OBJECT (trksrc),
(GWeakNotify) _trk_element_weak_notify_cb, gst_object_ref (pos));
g_signal_connect (trksrc, "notify::track", (GCallback) _track_changed_cb,
pos);
set_track (pos);
}
static void
gst_frame_positioner_dispose (GObject * object)
{
GstFramePositioner *pos = GST_FRAME_POSITIONNER (object);
if (pos->track_source) {
g_signal_handlers_disconnect_by_func (pos->track_source, _track_changed_cb,
pos);
pos->track_source = NULL;
}
if (pos->current_track) {
g_signal_handlers_disconnect_by_func (pos->current_track,
_track_restriction_changed_cb, pos);
g_object_weak_unref (G_OBJECT (pos->current_track),
(GWeakNotify) _weak_notify_cb, pos);
pos->current_track = NULL;
}
G_OBJECT_CLASS (gst_frame_positioner_parent_class)->dispose (object);
}
static void
gst_frame_positioner_class_init (GstFramePositionerClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstBaseTransformClass *base_transform_class =
GST_BASE_TRANSFORM_CLASS (klass);
GST_DEBUG_CATEGORY_INIT (framepositioner, "framepositioner",
GST_DEBUG_FG_YELLOW, "ges frame positioner");
gst_element_class_add_static_pad_template (GST_ELEMENT_CLASS (klass),
&gst_frame_positioner_src_template);
gst_element_class_add_static_pad_template (GST_ELEMENT_CLASS (klass),
&gst_frame_positioner_sink_template);
gobject_class->set_property = gst_frame_positioner_set_property;
gobject_class->get_property = gst_frame_positioner_get_property;
gobject_class->dispose = gst_frame_positioner_dispose;
base_transform_class->transform_ip =
GST_DEBUG_FUNCPTR (gst_frame_positioner_transform_ip);
/**
* gstframepositioner:alpha:
*
* The desired alpha for the stream.
*/
properties[PROP_ALPHA] =
g_param_spec_double ("alpha", "alpha", "alpha of the stream", 0.0, 1.0,
1.0, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE);
/**
* gstframepositioner:posx:
*
* The desired x position for the stream.
*/
properties[PROP_POSX] =
g_param_spec_int ("posx", "posx", "x position of the stream", MIN_PIXELS,
MAX_PIXELS, 0, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE);
/**
* gstframepositioner:posy:
*
* The desired y position for the stream.
*/
properties[PROP_POSY] =
g_param_spec_int ("posy", "posy", "y position of the stream", MIN_PIXELS,
MAX_PIXELS, 0, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE);
/**
* gstframepositioner:zorder:
*
* The desired z order for the stream.
*/
properties[PROP_ZORDER] =
g_param_spec_uint ("zorder", "zorder", "z order of the stream", 0,
G_MAXUINT, 0, G_PARAM_READWRITE);
/**
* gesframepositioner:width:
*
* The desired width for that source.
* Set to 0 if size is not mandatory, will be set to width of the current track.
*/
properties[PROP_WIDTH] =
g_param_spec_int ("width", "width", "width of the source", 0, MAX_PIXELS,
0, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE);
/**
* gesframepositioner:height:
*
* The desired height for that source.
* Set to 0 if size is not mandatory, will be set to height of the current track.
*/
properties[PROP_HEIGHT] =
g_param_spec_int ("height", "height", "height of the source", 0,
MAX_PIXELS, 0, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE);
g_object_class_install_properties (gobject_class, PROP_LAST, properties);
gst_element_class_set_static_metadata (GST_ELEMENT_CLASS (klass),
"frame positioner", "Metadata",
"This element provides with tagging facilities",
"mduponchelle1@gmail.com");
}
static void
gst_frame_positioner_init (GstFramePositioner * framepositioner)
{
framepositioner->alpha = 1.0;
framepositioner->posx = 0.0;
framepositioner->posy = 0.0;
framepositioner->zorder = 0;
framepositioner->width = 0;
framepositioner->height = 0;
framepositioner->fps_n = -1;
framepositioner->fps_d = -1;
framepositioner->track_width = 0;
framepositioner->track_height = 0;
framepositioner->capsfilter = NULL;
framepositioner->track_source = NULL;
framepositioner->current_track = NULL;
framepositioner->scale_in_compositor = TRUE;
framepositioner->par_n = -1;
framepositioner->par_d = 1;
}
void
gst_frame_positioner_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
GstFramePositioner *framepositioner = GST_FRAME_POSITIONNER (object);
gboolean track_mixing = TRUE;
if (framepositioner->current_track)
track_mixing = ges_track_get_mixing (framepositioner->current_track);
GST_OBJECT_LOCK (framepositioner);
switch (property_id) {
case PROP_ALPHA:
framepositioner->alpha = g_value_get_double (value);
break;
case PROP_POSX:
framepositioner->posx = g_value_get_int (value);
framepositioner->user_positioned = TRUE;
break;
case PROP_POSY:
framepositioner->posy = g_value_get_int (value);
framepositioner->user_positioned = TRUE;
break;
case PROP_ZORDER:
framepositioner->zorder = g_value_get_uint (value);
break;
case PROP_WIDTH:
framepositioner->user_positioned = TRUE;
framepositioner->width = g_value_get_int (value);
gst_frame_positioner_update_properties (framepositioner, track_mixing,
0, 0);
break;
case PROP_HEIGHT:
framepositioner->user_positioned = TRUE;
framepositioner->height = g_value_get_int (value);
gst_frame_positioner_update_properties (framepositioner, track_mixing,
0, 0);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
GST_OBJECT_UNLOCK (framepositioner);
}
void
gst_frame_positioner_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
GstFramePositioner *pos = GST_FRAME_POSITIONNER (object);
gint real_width, real_height;
switch (property_id) {
case PROP_ALPHA:
g_value_set_double (value, pos->alpha);
break;
case PROP_POSX:
g_value_set_int (value, pos->posx);
break;
case PROP_POSY:
g_value_set_int (value, pos->posy);
break;
case PROP_ZORDER:
g_value_set_uint (value, pos->zorder);
break;
case PROP_WIDTH:
if (pos->scale_in_compositor) {
g_value_set_int (value, pos->width);
} else {
real_width = pos->width > 0 ? pos->width : pos->track_width;
g_value_set_int (value, real_width);
}
break;
case PROP_HEIGHT:
if (pos->scale_in_compositor) {
g_value_set_int (value, pos->height);
} else {
real_height = pos->height > 0 ? pos->height : pos->track_height;
g_value_set_int (value, real_height);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
GType
gst_frame_positioner_meta_api_get_type (void)
{
static volatile GType type;
static const gchar *tags[] = { "video", NULL };
if (g_once_init_enter (&type)) {
GType _type = gst_meta_api_type_register ("GstFramePositionerApi", tags);
g_once_init_leave (&type, _type);
}
return type;
}
static const GstMetaInfo *
gst_frame_positioner_get_info (void)
{
static const GstMetaInfo *meta_info = NULL;
if (g_once_init_enter ((GstMetaInfo **) & meta_info)) {
const GstMetaInfo *meta =
gst_meta_register (gst_frame_positioner_meta_api_get_type (),
"GstFramePositionerMeta",
sizeof (GstFramePositionerMeta), gst_frame_positioner_meta_init,
NULL,
gst_frame_positioner_meta_transform);
g_once_init_leave ((GstMetaInfo **) & meta_info, (GstMetaInfo *) meta);
}
return meta_info;
}
static gboolean
gst_frame_positioner_meta_init (GstMeta * meta, gpointer params,
GstBuffer * buffer)
{
GstFramePositionerMeta *smeta;
smeta = (GstFramePositionerMeta *) meta;
smeta->alpha = 0.0;
smeta->posx = smeta->posy = smeta->height = smeta->width = 0;
smeta->zorder = 0;
return TRUE;
}
static gboolean
gst_frame_positioner_meta_transform (GstBuffer * dest, GstMeta * meta,
GstBuffer * buffer, GQuark type, gpointer data)
{
GstFramePositionerMeta *dmeta, *smeta;
smeta = (GstFramePositionerMeta *) meta;
if (GST_META_TRANSFORM_IS_COPY (type)) {
/* only copy if the complete data is copied as well */
dmeta =
(GstFramePositionerMeta *) gst_buffer_add_meta (dest,
gst_frame_positioner_get_info (), NULL);
dmeta->alpha = smeta->alpha;
dmeta->posx = smeta->posx;
dmeta->posy = smeta->posy;
dmeta->width = smeta->width;
dmeta->height = smeta->height;
dmeta->zorder = smeta->zorder;
}
return TRUE;
}
static GstFlowReturn
gst_frame_positioner_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
{
GstFramePositionerMeta *meta;
GstFramePositioner *framepositioner = GST_FRAME_POSITIONNER (trans);
GstClockTime timestamp = GST_BUFFER_PTS (buf);
if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
gst_object_sync_values (GST_OBJECT (trans), timestamp);
}
meta =
(GstFramePositionerMeta *) gst_buffer_add_meta (buf,
gst_frame_positioner_get_info (), NULL);
GST_OBJECT_LOCK (framepositioner);
meta->alpha = framepositioner->alpha;
meta->posx = framepositioner->posx;
meta->posy = framepositioner->posy;
meta->width = framepositioner->width;
meta->height = framepositioner->height;
meta->zorder = framepositioner->zorder;
GST_OBJECT_UNLOCK (framepositioner);
return GST_FLOW_OK;
}