test: audio: add unit test for multiband_drc

Add the ztest framework test cases for the multiband_drc module, validating
component instantiation and evaluation configuration structs bindings.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Author: lrgirdwo

zephyr/test/audio/test_multiband_drc.c

@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * Copyright(c) 2026 Intel Corporation.
+ */
+
+#include <zephyr/kernel.h>
+#include <zephyr/ztest.h>
+#include <string.h>
+#include <rtos/sof.h>
+#include <sof/list.h>
+#include <sof/audio/component.h>
+#include <sof/audio/component_ext.h>
+#include <sof/ipc/topology.h>
+#include <ipc4/base-config.h>
+#include "../../../src/audio/multiband_drc/user/multiband_drc.h"
+
+#include <rtos/alloc.h>
+
+extern void sys_comp_module_multiband_drc_interface_init(void);
+
+static void *setup(void)
+{
+	struct sof *sof = sof_get();
+
+	sys_comp_init(sof);
+
+	if (!sof->ipc) {
+		sof->ipc = rzalloc(SOF_MEM_FLAG_COHERENT, sizeof(*sof->ipc));
+		sof->ipc->comp_data = rzalloc(SOF_MEM_FLAG_COHERENT, 4096);
+		k_spinlock_init(&sof->ipc->lock);
+		list_init(&sof->ipc->msg_list);
+		list_init(&sof->ipc->comp_list);
+	}
+
+	sys_comp_module_multiband_drc_interface_init();
+	return NULL;
+}
+
+SOF_DEFINE_UUID("multiband_drc_test", multiband_drc_test_uuid,
+		0x0d9f2256, 0x8e4f, 0x47b3,
+		0x84, 0x48, 0x23, 0x9a, 0x33, 0x4f, 0x11, 0x91);
+
+struct custom_ipc4_config_multiband_drc {
+	struct ipc4_base_module_cfg base;
+	struct sof_multiband_drc_config config;
+	struct sof_drc_params drc_coef[2];
+} __attribute__((packed, aligned(8)));
+
+/* Test Multiband_DRC initialization */
+ZTEST(audio_multiband_drc, test_multiband_drc_init)
+{
+	struct comp_dev *comp;
+	struct comp_ipc_config ipc_config;
+	struct ipc_config_process spec;
+	struct custom_ipc4_config_multiband_drc init_data;
+
+	memset(&init_data, 0, sizeof(init_data));
+	init_data.base.audio_fmt.channels_count = 2;
+	init_data.base.audio_fmt.sampling_frequency = 48000;
+	init_data.base.audio_fmt.depth = 16;
+	init_data.base.audio_fmt.valid_bit_depth = 16;
+	init_data.base.audio_fmt.interleaving_style = IPC4_CHANNELS_INTERLEAVED;
+	init_data.base.ibs = 2048;
+	init_data.base.obs = 2048;
+
+	/* Setup Multiband_DRC specific parameters */
+	init_data.config.size = sizeof(struct sof_multiband_drc_config) + sizeof(struct sof_drc_params) * 2;
+	init_data.config.num_bands = 2;
+	init_data.config.enable_emp_deemp = 0;
+
+	/* Setup basic IPC configuration */
+	memset(&ipc_config, 0, sizeof(ipc_config));
+	ipc_config.id = 1;
+	ipc_config.pipeline_id = 1;
+	ipc_config.core = 0;
+
+	memset(&spec, 0, sizeof(spec));
+	spec.size = sizeof(init_data);
+	spec.data = (unsigned char *)&init_data;
+
+	struct list_item *clist;
+	const struct comp_driver *drv = NULL;
+
+	/* Find driver by UUID */
+	list_for_item(clist, &comp_drivers_get()->list) {
+		struct comp_driver_info *info = container_of(clist, struct comp_driver_info, list);
+		if (!info->drv->uid) continue;
+		if (!memcmp(info->drv->uid, &multiband_drc_test_uuid, sizeof(struct sof_uuid))) {
+			drv = info->drv;
+			break;
+		}
+	}
+	zassert_not_null(drv, "Driver for Multiband DRC not found");
+
+	/* Initialize component via ops */
+	comp = drv->ops.create(drv, &ipc_config, &spec);
+	zassert_not_null(comp, "Multiband DRC allocation failed");
+
+	/* Verify component state */
+	zassert_equal(comp->state, COMP_STATE_READY, "Component is not in READY state");
+	zassert_equal(comp->ipc_config.id, 1, "IPC ID mismatch");
+
+	/* Free the component */
+	drv->ops.free(comp);
+}
+
+ZTEST_SUITE(audio_multiband_drc, NULL, setup, NULL, NULL, NULL);