test(cmocka, drc): add DRC process unit test

Add a process-level cmocka test for the DRC module.

The new drc_process test follows the eq_iir_process harness (legacy
process_audio_stream API): it builds a small libaudio, creates the DRC
component through the full lifecycle (comp_new -> set_configuration ->
prepare -> streaming) and pushes a chirp signal in S16/S24/S32.

Author: piotrhoppeintel

test/cmocka/src/audio/drc/CMakeLists.txt

@@ -10,3 +10,54 @@ cmocka_test(drc_math_test
 )
 
 target_include_directories(drc_math_test PRIVATE ${PROJECT_SOURCE_DIR}/src/audio)
+
+cmocka_test(drc_process
+	drc_process.c
+)
+
+target_include_directories(drc_process PRIVATE ${PROJECT_SOURCE_DIR}/src/audio)
+
+# make small version of libaudio so we don't have to care
+# about unused missing references
+
+add_compile_options(-DUNIT_TEST)
+
+add_library(audio_for_drc STATIC
+	${PROJECT_SOURCE_DIR}/src/audio/drc/drc.c
+	${PROJECT_SOURCE_DIR}/src/audio/drc/drc_generic.c
+	${PROJECT_SOURCE_DIR}/src/audio/drc/drc_math_generic.c
+	${PROJECT_SOURCE_DIR}/src/audio/drc/drc_math_hifi3.c
+	${PROJECT_SOURCE_DIR}/src/audio/drc/drc_log.c
+	${PROJECT_SOURCE_DIR}/src/math/numbers.c
+	${PROJECT_SOURCE_DIR}/src/math/exp_fcn.c
+	${PROJECT_SOURCE_DIR}/src/math/exp_fcn_hifi.c
+	${PROJECT_SOURCE_DIR}/src/math/lut_trig.c
+	${PROJECT_SOURCE_DIR}/src/audio/module_adapter/module_adapter.c
+	${PROJECT_SOURCE_DIR}/src/audio/module_adapter/module_adapter_ipc3.c
+	${PROJECT_SOURCE_DIR}/src/audio/module_adapter/module/generic.c
+	${PROJECT_SOURCE_DIR}/src/audio/buffers/comp_buffer.c
+	${PROJECT_SOURCE_DIR}/src/audio/buffers/audio_buffer.c
+	${PROJECT_SOURCE_DIR}/src/audio/source_api_helper.c
+	${PROJECT_SOURCE_DIR}/src/audio/sink_api_helper.c
+	${PROJECT_SOURCE_DIR}/src/audio/sink_source_utils.c
+	${PROJECT_SOURCE_DIR}/src/audio/audio_stream.c
+	${PROJECT_SOURCE_DIR}/src/audio/component.c
+	${PROJECT_SOURCE_DIR}/src/audio/data_blob.c
+	${PROJECT_SOURCE_DIR}/src/module/audio/source_api.c
+	${PROJECT_SOURCE_DIR}/src/module/audio/sink_api.c
+	${PROJECT_SOURCE_DIR}/src/ipc/ipc3/helper.c
+	${PROJECT_SOURCE_DIR}/src/ipc/ipc-common.c
+	${PROJECT_SOURCE_DIR}/src/ipc/ipc-helper.c
+	${PROJECT_SOURCE_DIR}/src/lib/objpool.c
+	${PROJECT_SOURCE_DIR}/test/cmocka/src/notifier_mocks.c
+	${PROJECT_SOURCE_DIR}/src/audio/pipeline/pipeline-graph.c
+	${PROJECT_SOURCE_DIR}/src/audio/pipeline/pipeline-params.c
+	${PROJECT_SOURCE_DIR}/src/audio/pipeline/pipeline-schedule.c
+	${PROJECT_SOURCE_DIR}/src/audio/pipeline/pipeline-stream.c
+	${PROJECT_SOURCE_DIR}/src/audio/pipeline/pipeline-xrun.c
+)
+sof_append_relative_path_definitions(audio_for_drc)
+
+target_link_libraries(audio_for_drc PRIVATE sof_options)
+
+target_link_libraries(drc_process PRIVATE audio_for_drc)

test/cmocka/src/audio/drc/cmocka_drc_coef.h

@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright(c) 2024 Intel Corporation.
+ *
+ * DRC configuration blobs for the process unit test. Generated from
+ * tools/ctl/ipc4/drc/{passthrough,speaker_default}.txt (see
+ * src/audio/drc/tune/sof_example_drc.m). Each array is a sof_abi_hdr
+ * header followed by a struct sof_drc_config payload.
+ */
+
+#ifndef CMOCKA_DRC_COEF_H
+#define CMOCKA_DRC_COEF_H
+
+#include <stdint.h>
+
+/* Pass-through configuration (params.enabled = 0) */
+static const uint32_t drc_coef_pass_2ch[35] = {
+	0x00464f53, 0x00000000, 0x0000006c, 0x03013000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x0000006c, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00000000, 0xe8000000, 0x1e000000,
+	0x0c000000, 0x00624dd3, 0x0409c2b1, 0x05555555,
+	0x001efa50, 0x00946055, 0xff6a987e, 0x01fec983,
+	0x22474764, 0x01745617, 0x0071c71c, 0xff777777,
+	0x001f77d8, 0x00000005, 0x00438000, 0x00047dd7,
+	0x0025cea0, 0x00097dd7, 0x0000b5b1
+};
+
+/* Enabled configuration, small speaker default (params.enabled = 1) */
+static const uint32_t drc_coef_enabled_2ch[35] = {
+	0x00464f53, 0x00000000, 0x0000006c, 0x03013000,
+	0x00000000, 0x00000000, 0x00000000, 0x00000000,
+	0x0000006c, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0x00000001, 0xe2000000, 0x14000000,
+	0x0a000000, 0x00624dd3, 0x02061b8a, 0x06666666,
+	0x00ba972f, 0x001e0c18, 0xffe04220, 0x0050f44e,
+	0x08349f9a, 0x04d82cd3, 0x0071c71c, 0xff777777,
+	0x001f77d8, 0x00000005, 0x00438000, 0x00047dd7,
+	0x0025cea0, 0x00097dd7, 0x0000b5b1
+};
+
+#endif /* CMOCKA_DRC_COEF_H */