audio: dts: Add library stub

This will allow the fuzzer to probe deeper into the code while also
allowing CI to build test the adapter.

Signed-off-by: Curtis Malainey <cujomalainey@chromium.org>

src/audio/module_adapter/CMakeLists.txt

@@ -77,10 +77,14 @@ if((NOT CONFIG_LIBRARY) OR CONFIG_LIBRARY_STATIC)
 	endif()
 
 	if(CONFIG_DTS_CODEC)
-	add_local_sources(sof module/dts.c)
+	add_local_sources(sof module/dts/dts.c)
 	target_compile_definitions(sof PRIVATE -DDTS_MATH_INT32 -DDTS_XTENSA)
+	if (CONFIG_DTS_CODEC_STUB)
+	add_local_sources(sof module/dts/dts_stub.c)
+	else()
 	sof_add_static_library(DtsCodec ${CMAKE_CURRENT_LIST_DIR}/lib/release/libdts-sof-interface-i32.a)
 	endif()
+	endif()
 
 	return()
 endif()

src/audio/module_adapter/Kconfig

@@ -259,6 +259,7 @@ endif # volume
 	config DTS_CODEC
 	bool "DTS codec"
 	default n
+	select DTS_CODEC_STUB if COMP_STUBS
 	help
 		Select to include DTS codec.
 		In order to compile with this option enabled, a pre-compiled static library
@@ -266,6 +267,14 @@ endif # volume
 		then compilation errors will occur.
 		For more information, please contact sales@xperi.com
 
+	config DTS_CODEC_STUB
+	bool "DTS codec stub"
+	depends on DTS_CODEC
+	default n
+	help
+		Select to include DTS codec stub library. This is meant for testing and CI
+		purposes only.
+
 	config INTEL_MODULES
 	bool "Intel modules"
 	default n

src/audio/module_adapter/module/dts/dts_stub.c

@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: BSD-3-Clause
+//
+// Copyright(c) 2023 Google LLC. All rights reserved.
+//
+// Author: Curtis Malainey <cujomalainey@chromium.org>
+
+#include <sof/audio/dts/DtsSofInterface.h>
+
+DtsSofInterfaceResult DTS_SOF_INTERFACE_API dtsSofInterfaceInit(
+		DtsSofInterfaceInst           **ppInst,
+		DtsSofInterfaceAllocateMemory pMemoryAllocationFn,
+		DtsSofInterfaceFreeMemory     pMemoryFreeFn,
+		void                          *MemoryAllocationContext) DTS_SOF_INTERFACE_NOEXCEPT
+{
+	return DTS_SOF_INTERFACE_RESULT_SUCCESS;
+}
+
+DtsSofInterfaceResult DTS_SOF_INTERFACE_API dtsSofInterfacePrepare(
+	DtsSofInterfaceInst* pInst,
+	const DtsSofInterfaceBufferConfiguration* pBufferConfiguration,
+	void** ppSofInputBuffer,
+	unsigned int* pSofInputBufferSize,
+	void** ppSofOutputBuffer,
+	unsigned int* pSofOutputBufferSize) DTS_SOF_INTERFACE_NOEXCEPT
+{
+	return DTS_SOF_INTERFACE_RESULT_SUCCESS;
+}
+
+DtsSofInterfaceResult DTS_SOF_INTERFACE_API dtsSofInterfaceInitProcess(
+	DtsSofInterfaceInst* pInst) DTS_SOF_INTERFACE_NOEXCEPT
+{
+	return DTS_SOF_INTERFACE_RESULT_SUCCESS;
+}
+
+DtsSofInterfaceResult DTS_SOF_INTERFACE_API dtsSofInterfaceProcess(
+	DtsSofInterfaceInst* pInst,
+	 unsigned int* pNumBytesProcessed) DTS_SOF_INTERFACE_NOEXCEPT
+{
+	return DTS_SOF_INTERFACE_RESULT_SUCCESS;
+}
+
+DtsSofInterfaceResult DTS_SOF_INTERFACE_API dtsSofInterfaceApplyConfig(
+	DtsSofInterfaceInst* pInst,
+	int parameterId,
+	const void *pData,
+	unsigned int dataSize) DTS_SOF_INTERFACE_NOEXCEPT
+{
+	return DTS_SOF_INTERFACE_RESULT_SUCCESS;
+}
+
+DtsSofInterfaceResult DTS_SOF_INTERFACE_API dtsSofInterfaceReset(
+	DtsSofInterfaceInst* pInst) DTS_SOF_INTERFACE_NOEXCEPT
+{
+	return DTS_SOF_INTERFACE_RESULT_SUCCESS;
+}
+
+DtsSofInterfaceResult DTS_SOF_INTERFACE_API dtsSofInterfaceFree(
+	DtsSofInterfaceInst* pInst) DTS_SOF_INTERFACE_NOEXCEPT
+{
+	return DTS_SOF_INTERFACE_RESULT_SUCCESS;
+}
+
+DtsSofInterfaceResult DTS_SOF_INTERFACE_API dtsSofInterfaceGetVersion(
+	DtsSofInterfaceVersionInfo* pInterfaceVersion,
+	DtsSofInterfaceVersionInfo* pSdkVersion) DTS_SOF_INTERFACE_NOEXCEPT
+{
+	return DTS_SOF_INTERFACE_RESULT_SUCCESS;
+}

zephyr/CMakeLists.txt

@@ -730,7 +730,11 @@ zephyr_library_sources_ifdef(CONFIG_COMP_GOOGLE_HOTWORD_DETECT
 )
 
 zephyr_library_sources_ifdef(CONFIG_DTS_CODEC
-	${SOF_AUDIO_PATH}/module_adapter/module/dts.c
+	${SOF_AUDIO_PATH}/module_adapter/module/dts/dts.c
+)
+
+zephyr_library_sources_ifdef(CONFIG_DTS_CODEC_STUB
+	${SOF_AUDIO_PATH}/module_adapter/module/dts/dts_stub.c
 )
 
 zephyr_library_sources_ifdef(CONFIG_WAVES_CODEC