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analytics: add more convenient API to retrieve tensor

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`gst_tensor_meta_get_by_id (meta,id)' is more convenient then
retrieving the tensor index using `gst_tensor_meta_get_index_from_id()` followed
by `gst_tensor_meta_get ()`.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8848>
This commit is contained in:
Daniel Morin 2025-04-10 09:58:57 -04:00
parent 37629385d0
commit 93af941ce7
3 changed files with 48 additions and 0 deletions
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19
girs/GstAnalytics-1.0.gir
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@ -1481,6 +1481,25 @@ smaller than #GstTensorMeta.num_tensors</doc>
</parameter>
</parameters>
</method>
<method name="get_by_id" c:identifier="gst_tensor_meta_get_by_id" version="1.28">
<doc xml:space="preserve" filename="../subprojects/gst-plugins-bad/gst-libs/gst/analytics/gsttensormeta.c">Get the first tensor from the #GstTensorMeta identified by @id.</doc>
<source-position filename="../subprojects/gst-plugins-bad/gst-libs/gst/analytics/gsttensormeta.h"/>
<return-value transfer-ownership="none" nullable="1">
<doc xml:space="preserve" filename="../subprojects/gst-plugins-bad/gst-libs/gst/analytics/gsttensormeta.c">a GstTensor with id matching @id.
Otherwise NULL will be returned.</doc>
<type name="Tensor" c:type="const GstTensor*"/>
</return-value>
<parameters>
<instance-parameter name="tmeta" transfer-ownership="none">
<doc xml:space="preserve" filename="../subprojects/gst-plugins-bad/gst-libs/gst/analytics/gsttensormeta.c">A #GstTensorMeta</doc>
<type name="TensorMeta" c:type="GstTensorMeta*"/>
</instance-parameter>
<parameter name="id" transfer-ownership="none">
<doc xml:space="preserve" filename="../subprojects/gst-plugins-bad/gst-libs/gst/analytics/gsttensormeta.c">A #GQuark identifying tensor-encoding</doc>
<type name="GLib.Quark" c:type="GQuark"/>
</parameter>
</parameters>
</method>
<method name="get_index_from_id" c:identifier="gst_tensor_meta_get_index_from_id" version="1.26">
<doc xml:space="preserve" filename="../subprojects/gst-plugins-bad/gst-libs/gst/analytics/gsttensormeta.c">Finds the first tensor with the requsted ID in the meta</doc>
<source-position filename="../subprojects/gst-plugins-bad/gst-libs/gst/analytics/gsttensormeta.h"/>

26
subprojects/gst-plugins-bad/gst-libs/gst/analytics/gsttensormeta.c
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@ -153,6 +153,32 @@ gst_tensor_meta_set (GstTensorMeta * tmeta, guint num_tensors,
tmeta->tensors = tensors;
}
/**
* gst_tensor_meta_get_by_id:
* @tmeta: A #GstTensorMeta
* @id: A #GQuark identifying tensor-encoding
*
* Get the first tensor from the #GstTensorMeta identified by @id.
*
* Return: (nullable)(transfer none): a GstTensor with id matching @id.
* Otherwise NULL will be returned.
*
* Since: 1.28
*/
const GstTensor *
gst_tensor_meta_get_by_id (GstTensorMeta * tmeta, GQuark id)
{
g_return_val_if_fail (tmeta != NULL, NULL);
g_return_val_if_fail (tmeta->tensors, NULL);
for (int i = 0; i < tmeta->num_tensors; ++i) {
if (tmeta->tensors[i]->id == id)
return tmeta->tensors[i];
}
return NULL;
}
/**
* gst_tensor_meta_get:
* @tmeta: A #GstTensorMeta

3
subprojects/gst-plugins-bad/gst-libs/gst/analytics/gsttensormeta.h
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@ -79,6 +79,9 @@ GST_ANALYTICS_META_API
void gst_tensor_meta_set (GstTensorMeta *tmeta, guint num_tensors,
GstTensor **tensors);
GST_ANALYTICS_META_API
const GstTensor *gst_tensor_meta_get_by_id (GstTensorMeta *tmeta, GQuark id);
GST_ANALYTICS_META_API
const GstTensor *gst_tensor_meta_get (GstTensorMeta *tmeta, gsize index);