MLECO-3183: Refactoring application sources

Platform agnostic application sources are moved into application
api module with their own independent CMake projects.

Changes for MLECO-3080 also included - they create CMake projects
individial API's (again, platform agnostic) that dependent on the
common logic. The API for KWS_API "joint" API has been removed and
now the use case relies on individual KWS, and ASR API libraries.

Change-Id: I1f7748dc767abb3904634a04e0991b74ac7b756d
Signed-off-by: Kshitij Sisodia <kshitij.sisodia@arm.com>

1 files changed, 67 insertions, 0 deletions

diff --git a/source/application/api/common/include/BaseProcessing.hpp b/source/application/api/common/include/BaseProcessing.hpp
new file mode 100644
index 0000000..a54dd12
--- /dev/null
+++ b/source/application/api/common/include/BaseProcessing.hpp
@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2022 Arm Limited. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef BASE_PROCESSING_HPP
+#define BASE_PROCESSING_HPP
+
+#include <cstddef>
+
+namespace arm {
+namespace app {
+
+    /**
+     * @brief   Base class exposing pre-processing API.
+     *          Use cases should provide their own PreProcessing class that inherits from this one.
+     *          All steps required to take raw input data and populate tensors ready for inference
+     *          should be handled.
+     */
+    class BasePreProcess {
+
+    public:
+        virtual ~BasePreProcess() = default;
+
+        /**
+         * @brief       Should perform pre-processing of 'raw' input data and load it into
+         *              TFLite Micro input tensors ready for inference
+         * @param[in]   input      Pointer to the data that pre-processing will work on.
+         * @param[in]   inputSize  Size of the input data.
+         * @return      true if successful, false otherwise.
+         **/
+        virtual bool DoPreProcess(const void* input, size_t inputSize) = 0;
+    };
+
+    /**
+     * @brief   Base class exposing post-processing API.
+     *          Use cases should provide their own PostProcessing class that inherits from this one.
+     *          All steps required to take inference output and populate results vectors should be handled.
+     */
+    class BasePostProcess {
+
+    public:
+        virtual ~BasePostProcess() = default;
+
+        /**
+         * @brief       Should perform post-processing of the result of inference then populate
+         *              populate result data for any later use.
+         * @return      true if successful, false otherwise.
+         **/
+        virtual bool DoPostProcess() = 0;
+    };
+
+} /* namespace app */
+} /* namespace arm */
+
+#endif /* BASE_PROCESSING_HPP */
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