gstreamer/subprojects/gst-plugins-bad/gst-libs/gst/analytics/gstanalyticsclassificationmtd.c

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/* GStreamer
* Copyright (C) 2023 Collabora Ltd
*
* gstanalyticsclassificationmtd.c
*
* 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 St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstanalyticsclassificationmtd.h"
/**
* SECTION:gstanalyticsclassificationtd
* @title: GstAnalyticsClsMtd
* @short_description: An analytics metadata for classification inside a #GstAnalyticsRelationMeta
* @symbols:
* - GstAnalyticsClsMtd
* @see_also: #GstAnalyticsMtd, #GstAnalyticsRelationMeta
*
* This type of metadata holds classification, it is generally used in
* relationship with another metadata type to enhance its content. For example,
* it can enhance the classifcation of an object detection held by the
* #GstAnalyticsODMtd metadata type.
*
* Since: 1.24
*/
static const GstAnalyticsMtdImpl cls_impl = {
"classification",
NULL
};
typedef struct _GstAnalyticsClsConfLvlAndClass GstAnalyticsClsConfLvlAndClass;
typedef struct _GstAnalyticsClsMtdData GstAnalyticsClsMtdData;
struct _GstAnalyticsClsConfLvlAndClass
{
GQuark class;
gfloat confidence_levels;
};
/*
* GstAnalyticsClsMtd:
* @length: classes and confidence levels count
* @class_quarks: (array length=length): Array of quark representing a class
* @confidence_levels: (array length=length): Array of confidence levels for
* each class in @class_quarks.
*
* Information on results of a classification of buffer content.
*/
struct _GstAnalyticsClsMtdData
{
gsize length;
GstAnalyticsClsConfLvlAndClass confidence_levels_and_classes[]; // Must be last
};
/**
* gst_analytics_cls_mtd_get_mtd_type:
*
* Get an id identifying #GstAnalyticsMtd type.
*
* Returns: opaque id of #GstAnalyticsMtd type
*
* Since: 1.24
*/
GstAnalyticsMtdType
gst_analytics_cls_mtd_get_mtd_type (void)
{
return (GstAnalyticsMtdType) & cls_impl;
}
/**
* gst_analytics_cls_mtd_get_level:
* @handle: instance handle
* @index: Object class index
*
* Get confidence level for class at @index
* Returns: confidence level for @index, <0.0 if the call failed.
*
* Since: 1.24
*/
gfloat
gst_analytics_cls_mtd_get_level (GstAnalyticsClsMtd * handle, gsize index)
{
g_return_val_if_fail (handle, -1.0);
g_return_val_if_fail (handle->meta != NULL, -1.0);
GstAnalyticsClsMtdData *cls_mtd_data;
cls_mtd_data = gst_analytics_relation_meta_get_mtd_data (handle->meta,
handle->id);
g_return_val_if_fail (cls_mtd_data != NULL, -1.0);
g_return_val_if_fail (cls_mtd_data->length > index, -1.0);
return cls_mtd_data->confidence_levels_and_classes[index].confidence_levels;
}
/**
* gst_analytics_cls_mtd_get_index_by_quark:
* @handle: Instance handle
* @quark: Quark of the class
* Get index of class represented by @quark
* Returns: index of the class associated with @quarks ( and label) or
* a negative value on failure.
*
* Since: 1.24
*/
gint
gst_analytics_cls_mtd_get_index_by_quark (GstAnalyticsClsMtd * handle,
GQuark quark)
{
g_return_val_if_fail (handle, -1);
GstAnalyticsClsMtdData *cls_mtd_data;
cls_mtd_data = gst_analytics_relation_meta_get_mtd_data (handle->meta,
handle->id);
g_return_val_if_fail (cls_mtd_data != NULL, -1);
for (gint i = 0; i < cls_mtd_data->length; i++) {
if (quark == cls_mtd_data->confidence_levels_and_classes[i].class) {
return i;
}
}
return -1;
}
/**
* gst_analytics_cls_mtd_get_length:
* @handle: Instance handle
* Get number of classes
* Returns: Number of classes in this classification instance
*
* Since: 1.24
*/
gsize
gst_analytics_cls_mtd_get_length (GstAnalyticsClsMtd * handle)
{
GstAnalyticsClsMtdData *cls_mtd_data;
cls_mtd_data = gst_analytics_relation_meta_get_mtd_data (handle->meta,
handle->id);
g_return_val_if_fail (cls_mtd_data != NULL, 0);
return cls_mtd_data->length;
}
/**
* gst_analytics_cls_mtd_get_quark:
* @handle: Instance handle
* @index: index of the class
* Get quark of the class at @index
* Returns: Quark of this class (label) associated with @index
*
* Since: 1.24
*/
GQuark
gst_analytics_cls_mtd_get_quark (GstAnalyticsClsMtd * handle, gsize index)
{
GstAnalyticsClsMtdData *cls_mtd_data;
g_return_val_if_fail (handle, 0);
cls_mtd_data = gst_analytics_relation_meta_get_mtd_data (handle->meta,
handle->id);
g_return_val_if_fail (cls_mtd_data != NULL, 0);
g_return_val_if_fail (cls_mtd_data->length > index, 0);
return cls_mtd_data->confidence_levels_and_classes[index].class;
}
/**
* gst_analytics_relation_meta_add_cls_mtd:
* @instance: Instance of #GstAnalyticsRelationMeta where to add classification instance
* @length: length of @confidence_levels
* @confidence_levels: (array length=length): confidence levels
* @class_quarks: (array length=length): labels of this
* classification. Order define index, quark, labels relation. This array
* need to exist as long has this classification meta exist.
* @cls_mtd: (out) (not nullable): Handle updated to newly added classification meta.
*
* Add analytic classification metadata to @instance.
* Returns: Added successfully
*
* Since: 1.24
*/
gboolean
gst_analytics_relation_meta_add_cls_mtd (GstAnalyticsRelationMeta *
instance, gsize length, gfloat * confidence_levels, GQuark * class_quarks,
GstAnalyticsClsMtd * cls_mtd)
{
g_return_val_if_fail (instance, FALSE);
gsize confidence_levels_size =
(sizeof (GstAnalyticsClsConfLvlAndClass) * length);
gsize size = sizeof (GstAnalyticsClsMtdData) + confidence_levels_size;
GstAnalyticsClsConfLvlAndClass *conf_lvls_and_classes;
GstAnalyticsClsMtdData *cls_mtd_data = (GstAnalyticsClsMtdData *)
gst_analytics_relation_meta_add_mtd (instance, &cls_impl, size, cls_mtd);
if (cls_mtd_data) {
cls_mtd_data->length = length;
for (gsize i = 0; i < length; i++) {
conf_lvls_and_classes = &(cls_mtd_data->confidence_levels_and_classes[i]);
conf_lvls_and_classes->class = class_quarks[i];
conf_lvls_and_classes->confidence_levels = confidence_levels[i];
}
}
return cls_mtd_data != NULL;
}
/**
* gst_analytics_relation_meta_add_one_cls_mtd:
* @instance: Instance of #GstAnalyticsRelationMeta where to add classification instance
* @confidence_level: confidence levels
* @class_quark: labels of this
* classification. Order define index, quark, labels relation. This array
* need to exist as long has this classification meta exist.
* @cls_mtd: (out) (not nullable): Handle updated to newly added classification meta.
*
* Add analytic classification metadata to @instance.
* Returns: Added successfully
*
* Since: 1.24
*/
gboolean
gst_analytics_relation_meta_add_one_cls_mtd (GstAnalyticsRelationMeta *
instance, gfloat confidence_level, GQuark class_quark,
GstAnalyticsClsMtd * cls_mtd)
{
static const gsize len = 1;
return gst_analytics_relation_meta_add_cls_mtd (instance, len,
&confidence_level, &class_quark, cls_mtd);
}
/**
* gst_analytics_relation_meta_get_cls_mtd:
* @meta: Instance of #GstAnalyticsRelationMeta
* @an_meta_id: Id of #GstAnalyticsClsMtd instance to retrieve
* @rlt: (out caller-allocates)(not nullable): Will be filled with relatable
* meta
*
* Fill @rlt if a analytics-meta with id == @an_meta_id exist in @meta instance,
* otherwise this method return FALSE and @rlt is invalid.
*
* Returns: TRUE if successful.
*
* Since: 1.24
*/
gboolean
gst_analytics_relation_meta_get_cls_mtd (GstAnalyticsRelationMeta * meta,
guint an_meta_id, GstAnalyticsClsMtd * rlt)
{
return gst_analytics_relation_meta_get_mtd (meta, an_meta_id,
gst_analytics_cls_mtd_get_mtd_type (), (GstAnalyticsClsMtd *) rlt);
}