codec: Add dummy codec implementation

This is useful to test codec adapter component and generic codec code.

Our dummy codec has 1 input buffer and 1 output buffer and in its
initial implementation just copies input to output without any processing
on the data.

Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>

src/audio/Kconfig

@@ -336,6 +336,14 @@ config CADENCE_CODEC
 		Select for codecs which conforms to the Cadence API.
 		This will cause codec adapter component to include header
 		files specific to CADENCE base codecs.
+
+config DUMMY_CODEC
+	bool "Dummy codec"
+	default n
+	help
+	  Select for a dummy API codec implementation.
+	  This will cause codec adapter component to include header
+	  files specific to DUMMY base codecs.
 endif
 endmenu # "Audio components"
 

src/audio/codec_adapter/CMakeLists.txt

@@ -4,3 +4,7 @@ add_local_sources(sof codec_adapter.c codec/generic.c)
 if(CONFIG_CADENCE_CODEC)
 add_local_sources(sof codec/cadence.c)
 endif()
+
+if(CONFIG_DUMMY_CODEC)
+add_local_sources(sof codec/dummy.c)
+endif()

src/audio/codec_adapter/codec/dummy.c

@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: BSD-3-Clause
+//
+// Copyright 2020 NXP
+//
+// Author: Daniel Baluta <daniel.baluta@nxp.com>
+//
+// Dummy codec implementation to demonstrate Codec Adapter API
+
+#include <sof/audio/codec_adapter/codec/generic.h>
+#include <sof/audio/codec_adapter/codec/dummy.h>
+
+int dummy_codec_init(struct comp_dev *dev)
+{
+	comp_info(dev, "dummy_codec_init() start");
+	return 0;
+}
+
+int dummy_codec_prepare(struct comp_dev *dev)
+{
+	struct codec_data *codec = comp_get_codec(dev);
+	struct comp_data *cd = comp_get_drvdata(dev);
+
+	comp_info(dev, "dummy_codec_process()");
+
+	codec->cpd.in_buff = rballoc(0, SOF_MEM_CAPS_RAM, cd->period_bytes);
+	if (!codec->cpd.in_buff) {
+		comp_err(dev, "dummy_codec_prepare(): Failed to alloc in_buff");
+		return -ENOMEM;
+	}
+	codec->cpd.in_buff_size = cd->period_bytes;
+
+	codec->cpd.out_buff = rballoc(0, SOF_MEM_CAPS_RAM, cd->period_bytes);
+	if (!codec->cpd.out_buff) {
+		comp_err(dev, "dummy_codec_prepare(): Failed to alloc out_buff");
+		rfree(codec->cpd.in_buff);
+		return -ENOMEM;
+	}
+	codec->cpd.out_buff_size = cd->period_bytes;
+
+	return 0;
+}
+
+int dummy_codec_process(struct comp_dev *dev)
+{
+	struct codec_data *codec = comp_get_codec(dev);
+	struct comp_data *cd = comp_get_drvdata(dev);
+
+	comp_dbg(dev, "dummy_codec_process()");
+
+	memcpy_s(codec->cpd.out_buff, codec->cpd.out_buff_size,
+		 codec->cpd.in_buff, codec->cpd.in_buff_size);
+	codec->cpd.produced = cd->period_bytes;
+
+	return 0;
+}
+
+int dummy_codec_apply_config(struct comp_dev *dev)
+{
+	comp_info(dev, "dummy_codec_apply_config()");
+
+	/* nothing to do */
+	return 0;
+}
+
+int dummy_codec_reset(struct comp_dev *dev)
+{
+	comp_info(dev, "dummy_codec_reset()");
+
+	/* nothing to do */
+	return 0;
+}
+
+int dummy_codec_free(struct comp_dev *dev)
+{
+	struct codec_data *codec = comp_get_codec(dev);
+
+	comp_info(dev, "dummy_codec_free()");
+
+	rfree(codec->cpd.in_buff);
+	rfree(codec->cpd.out_buff);
+
+	return 0;
+}

src/include/sof/audio/codec_adapter/codec/dummy.h

@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright 2020 NXP
+ *
+ * Author: Daniel Baluta <daniel.baluta@nxp.com>
+ */
+
+#ifndef __SOF_AUDIO_DUMMY_CODEC__
+#define __SOF_AUDIO_DUMMY_CODEC__
+
+int dummy_codec_init(struct comp_dev *dev);
+int dummy_codec_prepare(struct comp_dev *dev);
+int dummy_codec_process(struct comp_dev *dev);
+int dummy_codec_apply_config(struct comp_dev *dev);
+int dummy_codec_reset(struct comp_dev *dev);
+int dummy_codec_free(struct comp_dev *dev);
+
+#endif /* __SOF_AUDIO_DUMMY_CODEC__ */

src/include/sof/audio/codec_adapter/interfaces.h

@@ -15,7 +15,12 @@
 #include <sof/audio/codec_adapter/codec/cadence.h>
 #endif /* CONFIG_CADENCE_CODEC */
 
+#if CONFIG_DUMMY_CODEC
+#include <sof/audio/codec_adapter/codec/dummy.h>
+#endif
+
 #define CADENCE_ID 0xCADE01
+#define DUMMY_ID   0xD03311
 
 /*****************************************************************************/
 /* Linked codecs interfaces						     */
@@ -32,6 +37,18 @@ static struct codec_interface interfaces[] = {
 		.free = cadence_codec_free
 	},
 #endif /* CONFIG_CADENCE_CODEC */
+
+#ifdef CONFIG_DUMMY_CODEC
+	{
+		.id = DUMMY_ID, /** dummy interface */
+		.init  = dummy_codec_init,
+		.prepare = dummy_codec_prepare,
+		.process = dummy_codec_process,
+		.apply_config = dummy_codec_apply_config,
+		.reset = dummy_codec_reset,
+		.free = dummy_codec_free
+	},
+#endif /* CONFIG_DUMMY_CODEC */
 };
 
 #endif /* __SOF_AUDIO_CODEC_INTERFACES__ */