gstreamer/ges/gstframepositioner.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 "gstframepositioner.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_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
};
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 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 (old_track_width && pos->width == old_track_width &&
old_track_height && pos->height == old_track_height &&
pos->track_height && pos->track_width &&
((float) old_track_width / (float) old_track_height) ==
((float) pos->track_width / (float) pos->track_height)) {
GST_DEBUG_OBJECT (pos, "Following track size width old_track: %d -- pos: %d"
" || height, old_track %d -- pos: %d",
old_track_width, pos->width, old_track_height, pos->height);
pos->width = pos->track_width;
pos->height = pos->track_height;
}
GST_DEBUG_OBJECT (caps, "setting caps");
g_object_set (pos->capsfilter, "caps", caps, NULL);
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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;
}
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);
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;
}
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, 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_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.
*/
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));
/**
* gstframepositioner: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));
/**
* gstframepositioner: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));
/**
* gstframepositioner: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, 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.
*/
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 | 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.
*/
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_PARAM_CONTROLLABLE));
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;
}
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);
break;
case PROP_POSY:
framepositioner->posy = g_value_get_int (value);
break;
case PROP_ZORDER:
framepositioner->zorder = g_value_get_uint (value);
break;
case PROP_WIDTH:
framepositioner->width = g_value_get_int (value);
gst_frame_positioner_update_properties (framepositioner, track_mixing,
0, 0);
break;
case PROP_HEIGHT:
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;
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_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_TIMESTAMP (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;
}