gstreamer/ges/gstframepositionner.c

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/* 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 <gst/gst.h>
#include <gst/video/video.h>
#include "gstframepositionner.h"
/* 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_positionner_set_property (GObject * object,
guint property_id, const GValue * value, GParamSpec * pspec);
static void gst_frame_positionner_get_property (GObject * object,
guint property_id, GValue * value, GParamSpec * pspec);
static GstFlowReturn gst_frame_positionner_transform_ip (GstBaseTransform *
trans, GstBuffer * buf);
static gboolean
gst_frame_positionner_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
};
static GstStaticPadTemplate gst_frame_positionner_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw")
);
static GstStaticPadTemplate gst_frame_positionner_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw")
);
G_DEFINE_TYPE (GstFramePositionner, gst_frame_positionner,
GST_TYPE_BASE_TRANSFORM);
static void
_weak_notify_cb (GstFramePositionner * pos, GObject * old)
{
pos->current_track = NULL;
}
static void
gst_frame_positionner_update_properties (GstFramePositionner * pos)
{
GstCaps *caps;
gint final_width;
gint final_height;
if (pos->capsfilter == NULL)
return;
final_width = (pos->width > 0) ? pos->width : pos->track_width;
final_height = (pos->height > 0) ? pos->height : pos->track_height;
if (final_width == 0 && final_height == 0)
caps = gst_caps_new_empty_simple ("video/x-raw");
else if (final_width == 0)
caps =
gst_caps_new_simple ("video/x-raw", "height", G_TYPE_INT, final_height,
NULL);
else if (final_height == 0)
caps =
gst_caps_new_simple ("video/x-raw", "width", G_TYPE_INT, final_width,
NULL);
else
caps =
gst_caps_new_simple ("video/x-raw", "width", G_TYPE_INT,
final_width, "height", G_TYPE_INT, final_height, NULL);
GST_DEBUG_OBJECT (pos, "updated size to : %d %d", final_width, final_height);
if (pos->fps_n != -1)
gst_caps_set_simple (caps, "framerate", GST_TYPE_FRACTION, pos->fps_n,
pos->fps_d, NULL);
GST_DEBUG_OBJECT (pos, "setting caps : %s", gst_caps_to_string (caps));
g_object_set (pos->capsfilter, "caps", caps, NULL);
g_object_notify (G_OBJECT (pos), "width");
g_object_notify (G_OBJECT (pos), "height");
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gst_caps_unref (caps);
}
static void
sync_properties_from_caps (GstFramePositionner * pos, GstCaps * caps)
{
gint width, height;
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;
}
pos->track_width = width;
pos->track_height = height;
GST_DEBUG_OBJECT (pos, "syncing size from caps : %d %d", width, height);
GST_DEBUG_OBJECT (pos, "syncing framerate from caps : %d/%d", pos->fps_n,
pos->fps_d);
gst_frame_positionner_update_properties (pos);
}
static void
sync_properties_with_track (GstFramePositionner * pos, GESTrack * track)
{
GstCaps *caps;
g_object_get (track, "restriction-caps", &caps, NULL);
sync_properties_from_caps (pos, caps);
}
static void
_track_restriction_changed_cb (GESTrack * track, GParamSpec * arg G_GNUC_UNUSED,
GstFramePositionner * pos)
{
sync_properties_with_track (pos, track);
}
static void
_track_changed_cb (GESTrackElement * trksrc, GParamSpec * arg G_GNUC_UNUSED,
GstFramePositionner * 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 (trksrc);
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_with_track (pos, pos->current_track);
} else
pos->current_track = NULL;
}
void
ges_frame_positionner_set_source_and_filter (GstFramePositionner * pos,
GESTrackElement * trksrc, GstElement * capsfilter)
{
pos->track_source = trksrc;
pos->capsfilter = capsfilter;
pos->current_track = ges_track_element_get_track (trksrc);
g_object_add_weak_pointer (G_OBJECT (pos->track_source),
((gpointer *) & pos->track_source));
g_object_weak_ref (G_OBJECT (pos->current_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);
g_signal_connect (trksrc, "notify::track", (GCallback) _track_changed_cb,
pos);
sync_properties_with_track (pos, pos->current_track);
}
static void
gst_frame_positionner_dispose (GObject * object)
{
GstFramePositionner *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_positionner_parent_class)->dispose (object);
}
static void
gst_frame_positionner_class_init (GstFramePositionnerClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstBaseTransformClass *base_transform_class =
GST_BASE_TRANSFORM_CLASS (klass);
gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass),
gst_static_pad_template_get (&gst_frame_positionner_src_template));
gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass),
gst_static_pad_template_get (&gst_frame_positionner_sink_template));
gobject_class->set_property = gst_frame_positionner_set_property;
gobject_class->get_property = gst_frame_positionner_get_property;
gobject_class->dispose = gst_frame_positionner_dispose;
base_transform_class->transform_ip =
GST_DEBUG_FUNCPTR (gst_frame_positionner_transform_ip);
/**
* gstframepositionner:alpha:
*
* The desired alpha for the stream.
*/
g_object_class_install_property (gobject_class, PROP_ALPHA,
g_param_spec_double ("alpha", "alpha", "alpha of the stream",
0.0, 1.0, 1.0, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
/**
* gstframepositionner:posx:
*
* The desired x position for the stream.
*/
g_object_class_install_property (gobject_class, PROP_POSX,
g_param_spec_int ("posx", "posx", "x position of the stream",
MIN_PIXELS, MAX_PIXELS, 0,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
/**
* gstframepositionner:posy:
*
* The desired y position for the stream.
*/
g_object_class_install_property (gobject_class, PROP_POSY,
g_param_spec_int ("posy", "posy", "y position of the stream",
MIN_PIXELS, MAX_PIXELS, 0,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
/**
* gstframepositionner:zorder:
*
* The desired z order for the stream.
*/
g_object_class_install_property (gobject_class, PROP_ZORDER,
g_param_spec_uint ("zorder", "zorder", "z order of the stream",
0, 10000, 0, G_PARAM_READWRITE));
/**
* gesframepositionner:width:
*
* The desired width for that source.
* Set to 0 if size is not mandatory, will be set to width of the current track.
*/
g_object_class_install_property (gobject_class, PROP_WIDTH,
g_param_spec_int ("width", "width", "width of the source",
0, MAX_PIXELS, 0, G_PARAM_READWRITE));
/**
* gesframepositionner:height:
*
* The desired height for that source.
* Set to 0 if size is not mandatory, will be set to height of the current track.
*/
g_object_class_install_property (gobject_class, PROP_HEIGHT,
g_param_spec_int ("height", "height", "height of the source",
0, MAX_PIXELS, 0, G_PARAM_READWRITE));
gst_element_class_set_static_metadata (GST_ELEMENT_CLASS (klass),
"frame positionner", "Metadata",
"This element provides with tagging facilities",
"mduponchelle1@gmail.com");
}
static void
gst_frame_positionner_init (GstFramePositionner * framepositionner)
{
framepositionner->alpha = 1.0;
framepositionner->posx = 0.0;
framepositionner->posy = 0.0;
framepositionner->zorder = 0;
framepositionner->width = 0;
framepositionner->height = 0;
framepositionner->fps_n = -1;
framepositionner->fps_d = -1;
framepositionner->track_width = 0;
framepositionner->track_height = 0;
framepositionner->capsfilter = NULL;
framepositionner->track_source = NULL;
framepositionner->current_track = NULL;
}
void
gst_frame_positionner_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
GstFramePositionner *framepositionner = GST_FRAME_POSITIONNER (object);
GST_OBJECT_LOCK (framepositionner);
switch (property_id) {
case PROP_ALPHA:
framepositionner->alpha = g_value_get_double (value);
break;
case PROP_POSX:
framepositionner->posx = g_value_get_int (value);
break;
case PROP_POSY:
framepositionner->posy = g_value_get_int (value);
break;
case PROP_ZORDER:
framepositionner->zorder = g_value_get_uint (value);
break;
case PROP_WIDTH:
framepositionner->width = g_value_get_int (value);
gst_frame_positionner_update_properties (framepositionner);
break;
case PROP_HEIGHT:
framepositionner->height = g_value_get_int (value);
gst_frame_positionner_update_properties (framepositionner);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
GST_OBJECT_UNLOCK (framepositionner);
}
void
gst_frame_positionner_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
GstFramePositionner *pos = GST_FRAME_POSITIONNER (object);
gint real_width, real_height;
GST_DEBUG_OBJECT (pos, "get_property");
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:
real_width = (pos->width > 0) ? pos->width : pos->track_width;
g_value_set_int (value, real_width);
break;
case PROP_HEIGHT:
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_positionner_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 ("GstFramePositionnerApi", tags);
g_once_init_leave (&type, _type);
}
return type;
}
static const GstMetaInfo *
gst_frame_positionner_get_info (void)
{
static const GstMetaInfo *meta_info = NULL;
if (g_once_init_enter (&meta_info)) {
const GstMetaInfo *meta =
gst_meta_register (gst_frame_positionner_meta_api_get_type (),
"GstFramePositionnerMeta",
sizeof (GstFramePositionnerMeta), (GstMetaInitFunction) NULL,
(GstMetaFreeFunction) NULL,
(GstMetaTransformFunction) gst_frame_positionner_meta_transform);
g_once_init_leave (&meta_info, meta);
}
return meta_info;
}
static gboolean
gst_frame_positionner_meta_transform (GstBuffer * dest, GstMeta * meta,
GstBuffer * buffer, GQuark type, gpointer data)
{
GstFramePositionnerMeta *dmeta, *smeta;
smeta = (GstFramePositionnerMeta *) meta;
if (GST_META_TRANSFORM_IS_COPY (type)) {
/* only copy if the complete data is copied as well */
dmeta =
(GstFramePositionnerMeta *) gst_buffer_add_meta (dest,
gst_frame_positionner_get_info (), NULL);
dmeta->alpha = smeta->alpha;
dmeta->posx = smeta->posx;
dmeta->posy = smeta->posy;
dmeta->zorder = smeta->zorder;
}
return TRUE;
}
static GstFlowReturn
gst_frame_positionner_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
{
GstFramePositionnerMeta *meta;
GstFramePositionner *framepositionner = GST_FRAME_POSITIONNER (trans);
GstClockTime timestamp = GST_BUFFER_TIMESTAMP (buf);
if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
gst_object_sync_values (GST_OBJECT (trans), timestamp);
}
meta =
(GstFramePositionnerMeta *) gst_buffer_add_meta (buf,
gst_frame_positionner_get_info (), NULL);
GST_OBJECT_LOCK (framepositionner);
meta->alpha = framepositionner->alpha;
meta->posx = framepositionner->posx;
meta->posy = framepositionner->posy;
meta->zorder = framepositionner->zorder;
GST_OBJECT_UNLOCK (framepositionner);
return GST_FLOW_OK;
}