test: add test for tensor-meta

- Verify we can add a tensor-meta to a buffer
- Verify we can get a tensor from a tensor-meta

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8848>

subprojects/gst-plugins-bad/tests/check/libs/analyticsmeta.c

@@ -1798,6 +1798,60 @@ GST_START_TEST (test_iou_float)
 
 GST_END_TEST;
 
+GST_START_TEST (test_get_tensor)
+{
+  GstBuffer *buf, *tensor_data;
+  GstTensorMeta *tmeta;
+  GstTensor *tensor;
+  const GstTensor *tensor2;
+  GstTensor **tensors;
+  GQuark tensor_id = g_quark_from_string ("tensor-encoding-1");
+  gsize dims[] = { 1 };
+  gsize index;
+
+  /* Verify we can add a tensor-meta to a buffer */
+
+  /* Create tensor data */
+  guint8 *data = g_malloc0 (1);
+  *data = 28;
+
+  /* Wrap tensor data into a GstBuffer */
+  tensor_data = gst_buffer_new_wrapped_full (0, data, 1, 0, 1, data, g_free);
+
+  /* Create a new buffer where we attach tensor-meta */
+  buf = gst_buffer_new ();
+  tmeta = gst_buffer_add_tensor_meta (buf);
+
+  /* Create a tensor */
+  tensor = gst_tensor_new_simple (tensor_id, GST_TENSOR_DATA_TYPE_UINT8,
+      tensor_data, GST_TENSOR_DIM_ORDER_COL_MAJOR, 1, dims);
+
+  /* Create an array of tensor to fullfil GstTensor API */
+  tensors = g_new (GstTensor *, 1);
+  tensors[0] = tensor;
+
+  /* Set tensor-meta's tensors */
+  gst_tensor_meta_set (tmeta, 1, tensors);
+
+  /* Retieve tensor using index interface */
+  index = gst_tensor_meta_get_index_from_id (tmeta, tensor_id);
+
+  fail_unless (index == 0);
+
+  tensor2 = gst_tensor_meta_get (tmeta, index);
+
+  /* Verify tensor retrieved */
+  fail_unless (tensor == tensor2);
+
+  /* Retrieve tensor using tensor-id directly */
+  tensor2 = gst_tensor_meta_get_by_id (tmeta, tensor_id);
+
+  fail_unless (tensor == tensor2);
+
+  gst_buffer_unref (buf);
+}
+
+GST_END_TEST;
 
 static Suite *
 analyticmeta_suite (void)
@@ -1811,6 +1865,7 @@ analyticmeta_suite (void)
   TCase *tc_chain_tracking;
   TCase *tc_chain_segmentation;
   TCase *tc_chain_util;
+  TCase *tc_chain_tensors;
 
   s = suite_create ("Analytic Meta Library");
 
@@ -1861,6 +1916,10 @@ analyticmeta_suite (void)
   tcase_add_test (tc_chain_util, test_iou_int);
   tcase_add_test (tc_chain_util, test_iou_float);
 
+  tc_chain_tensors = tcase_create ("TensorMeta");
+  suite_add_tcase (s, tc_chain_tensors);
+  tcase_add_test (tc_chain_tensors, test_get_tensor);
+
   return s;
 }