gstreamer/ges/ges-clip-asset.c
Thibault Saunier 13325aabdd ges: Add a SourceClipAsset class
Cleaning up the way we use the default framerate for natural
frame rate.
2020-03-25 11:26:29 -03:00

235 lines
7 KiB
C

/* Gstreamer Editing Services
*
* Copyright (C) <2011> Thibault Saunier <thibault.saunier@collabora.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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION: gesclipasset
* @title: GESClipAsset
* @short_description: A GESAsset subclass specialized in GESClip extraction
*
* The #GESUriClipAsset is a special #GESAsset specilized in #GESClip.
* it is mostly used to get information about the #GESTrackType-s the objects extracted
* from it can potentialy create #GESTrackElement for.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "ges-clip-asset.h"
#include "ges-source-clip.h"
#include "ges-internal.h"
#define GES_CLIP_ASSET_GET_PRIVATE(o)\
(G_TYPE_INSTANCE_GET_PRIVATE ((o), GES_TYPE_CLIP_ASSET, \
GESClipAssetPrivate))
#define parent_class ges_clip_asset_parent_class
struct _GESClipAssetPrivate
{
GESTrackType supportedformats;
};
enum
{
PROP_0,
PROP_SUPPORTED_FORMATS,
PROP_LAST
};
static GParamSpec *properties[PROP_LAST];
G_DEFINE_TYPE_WITH_PRIVATE (GESClipAsset, ges_clip_asset, GES_TYPE_ASSET);
/***********************************************
* *
* GObject vmetods implemenation *
* *
***********************************************/
static void
_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
GESClipAssetPrivate *priv = GES_CLIP_ASSET (object)->priv;
switch (property_id) {
case PROP_SUPPORTED_FORMATS:
g_value_set_flags (value, priv->supportedformats);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
GESClipAssetPrivate *priv = GES_CLIP_ASSET (object)->priv;
switch (property_id) {
case PROP_SUPPORTED_FORMATS:
priv->supportedformats = g_value_get_flags (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ges_clip_asset_init (GESClipAsset * self)
{
self->priv = ges_clip_asset_get_instance_private (self);
}
static void
_constructed (GObject * object)
{
GType extractable_type = ges_asset_get_extractable_type (GES_ASSET (object));
GObjectClass *class = g_type_class_ref (extractable_type);
GParamSpecFlags *pspec;
pspec = G_PARAM_SPEC_FLAGS (g_object_class_find_property (class,
"supported-formats"));
GES_CLIP_ASSET (object)->priv->supportedformats = pspec->default_value;
g_type_class_unref (class);
G_OBJECT_CLASS (parent_class)->constructed (object);
}
static void
ges_clip_asset_class_init (GESClipAssetClass * self_class)
{
GObjectClass *object_class = G_OBJECT_CLASS (self_class);
object_class->constructed = _constructed;
object_class->get_property = _get_property;
object_class->set_property = _set_property;
/**
* GESClipAsset:supported-formats:
*
* The formats supported by the asset.
*/
properties[PROP_SUPPORTED_FORMATS] = g_param_spec_flags ("supported-formats",
"Supported formats", "Formats supported by the file",
GES_TYPE_TRACK_TYPE, GES_TRACK_TYPE_AUDIO | GES_TRACK_TYPE_VIDEO,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT);
g_object_class_install_property (object_class, PROP_SUPPORTED_FORMATS,
properties[PROP_SUPPORTED_FORMATS]);
}
/***********************************************
* *
* Public methods *
* *
***********************************************/
/**
* ges_clip_asset_set_supported_formats:
* @self: a #GESClipAsset
* @supportedformats: The track types supported by the GESClipAsset
*
* Sets track types for which objects extracted from @self can create #GESTrackElement
*/
void
ges_clip_asset_set_supported_formats (GESClipAsset * self,
GESTrackType supportedformats)
{
g_return_if_fail (GES_IS_CLIP_ASSET (self));
self->priv->supportedformats = supportedformats;
}
/**
* ges_clip_asset_get_supported_formats:
* @self: a #GESClipAsset
*
* Gets track types for which objects extracted from @self can create #GESTrackElement
*
* Returns: The track types on which @self will create TrackElement when added to
* a layer
*/
GESTrackType
ges_clip_asset_get_supported_formats (GESClipAsset * self)
{
g_return_val_if_fail (GES_IS_CLIP_ASSET (self), GES_TRACK_TYPE_UNKNOWN);
return self->priv->supportedformats;
}
/**
* ges_clip_asset_get_natural_framerate:
* @self: The object from which to retrieve the natural framerate
* @framerate_n: The framerate numerator
* @framerate_d: The framerate denominator
*
* Result: %TRUE if @self has a natural framerate %FALSE otherwise
*/
gboolean
ges_clip_asset_get_natural_framerate (GESClipAsset * self,
gint * framerate_n, gint * framerate_d)
{
GESClipAssetClass *klass;
g_return_val_if_fail (GES_IS_CLIP_ASSET (self), FALSE);
g_return_val_if_fail (framerate_n && framerate_d, FALSE);
klass = GES_CLIP_ASSET_GET_CLASS (self);
*framerate_n = 0;
*framerate_d = -1;
if (klass->get_natural_framerate)
return klass->get_natural_framerate (self, framerate_n, framerate_d);
return FALSE;
}
/**
* ges_clip_asset_get_frame_time:
* @self: The object for which to compute timestamp for specifed frame
* @frame_number: The frame number we want the internal time coordinate timestamp of
*
* Converts the given frame number into a timestamp, using the "natural" frame
* rate of the asset.
*
* You can use this to reference a specific frame in a media file and use this
* as, for example, the `in-point` or `max-duration` of a #GESClip.
*
* Returns: The timestamp corresponding to @frame_number in the element source, given
* in internal time coordinates, or #GST_CLOCK_TIME_NONE if the clip asset does not have a
* natural frame rate.
*/
GstClockTime
ges_clip_asset_get_frame_time (GESClipAsset * self, GESFrameNumber frame_number)
{
gint fps_n, fps_d;
g_return_val_if_fail (GES_IS_CLIP_ASSET (self), GST_CLOCK_TIME_NONE);
g_return_val_if_fail (GES_FRAME_NUMBER_IS_VALID (frame_number),
GST_CLOCK_TIME_NONE);
if (!ges_clip_asset_get_natural_framerate (self, &fps_n, &fps_d))
return GST_CLOCK_TIME_NONE;
return gst_util_uint64_scale_int_ceil (frame_number, fps_d * GST_SECOND,
fps_n);
}