Revert "external: tinycompress: add support for compress plugins"

This reverts commit 43b7f4b911e942f2ee3e6418743821dce93d48f1.

CRs-Fixed: 2653755
Change-Id: I825f4a07b62c2925c13767a40dbc9eac67f65fa9

8 files changed, 107 insertions, 1005 deletions

diff --git a/Android.mk b/Android.mk
index 3744f43..6242708 100644
--- a/Android.mk
+++ b/Android.mk
@@ -7,11 +7,10 @@ ifeq ($(strip $(AUDIO_FEATURE_ENABLED_EXTENDED_COMPRESS_FORMAT)), true)
 LOCAL_CFLAGS += -DENABLE_EXTENDED_COMPRESS_FORMAT
 endif
 LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
-LOCAL_C_INCLUDES += $(LOCAL_PATH)/
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/techpack/audio/include
 LOCAL_ADDITIONAL_DEPENDENCIES := $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr
-LOCAL_SRC_FILES := compress.c utils.c compress_hw.c compress_plugin.c snd_utils.c
+LOCAL_SRC_FILES := compress.c utils.c
 LOCAL_MODULE := libtinycompress
 LOCAL_SHARED_LIBRARIES := libcutils libutils
 LOCAL_MODULE_TAGS := optional
@@ -21,7 +20,6 @@ include $(BUILD_SHARED_LIBRARY)
 include $(CLEAR_VARS)
 LOCAL_CFLAGS := -Wno-macro-redefined -Wno-unused-function
 LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
-LOCAL_C_INCLUDES += $(LOCAL_PATH)/
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/techpack/audio/include
 LOCAL_ADDITIONAL_DEPENDENCIES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr
@@ -35,11 +33,10 @@ include $(BUILD_EXECUTABLE)
 include $(CLEAR_VARS)
 LOCAL_CFLAGS := -Wno-macro-redefined -Wno-unused-function
 LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
-LOCAL_C_INCLUDES += $(LOCAL_PATH)/
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/techpack/audio/include
 LOCAL_ADDITIONAL_DEPENDENCIES := $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr
-LOCAL_SRC_FILES := compress.c utils.c  compress_hw.c compress_plugin.c snd_utils.c
+LOCAL_SRC_FILES := compress.c utils.c
 LOCAL_CFLAGS += -DUSE_VENDOR_EXTN
 LOCAL_CFLAGS += -DENABLE_EXTENDED_COMPRESS_FORMAT
 LOCAL_MODULE := libtinycompress_vendor
diff --git a/compress.c b/compress.c
index 7422c4b..5845cae 100644
--- a/compress.c
+++ b/compress.c
@@ -75,8 +75,6 @@
 #include "sound/compress_params.h"
 #include "sound/compress_offload.h"
 #include "tinycompress/tinycompress.h"
-#include "compress_ops.h"
-#include "snd_utils.h"
 
 #define COMPR_ERR_MAX 128
 
@@ -93,15 +91,8 @@ struct compress {
 	int nonblocking;
 	unsigned int gapless_metadata;
 	unsigned int next_track;
-
-	struct compress_ops *ops;
-	void *data;
-	void *snd_node;
 };
 
-extern struct compress_ops compr_hw_ops;
-extern struct compress_ops compr_plug_ops;
-
 static int oops(struct compress *compress, int e, const char *fmt, ...)
 {
 	va_list ap;
@@ -129,33 +120,75 @@ static struct compress bad_compress = {
 
 int is_compress_running(struct compress *compress)
 {
-	return ((compress->fd >= 0) && compress->running) ? 1 : 0;
+	return ((compress->fd > 0) && compress->running) ? 1 : 0;
 }
 
 int is_compress_ready(struct compress *compress)
 {
-	return (compress->fd >= 0) ? 1 : 0;
+	return (compress->fd > 0) ? 1 : 0;
 }
 
 static int get_compress_version(struct compress *compress)
 {
 	int version = 0;
 
-	if (compress->ops->ioctl(compress->data, SNDRV_COMPRESS_IOCTL_VERSION, &version)) {
+	if (ioctl(compress->fd, SNDRV_COMPRESS_IOCTL_VERSION, &version)) {
 		oops(compress, errno, "cant read version");
 		return -1;
 	}
 	return version;
 }
 
-static bool _is_codec_type_supported(struct compress_ops *ops, void *data,
-		struct snd_codec *codec)
+static bool _is_codec_supported(struct compress *compress, struct compr_config *config,
+				const struct snd_compr_caps *caps)
+{
+	bool codec = false;
+	unsigned int i;
+
+	for (i = 0; i < caps->num_codecs; i++) {
+		if (caps->codecs[i] == config->codec->id) {
+			/* found the codec */
+			codec = true;
+			break;
+		}
+	}
+	if (codec == false) {
+		oops(compress, ENXIO, "this codec is not supported");
+		return false;
+	}
+
+	if (config->fragment_size < caps->min_fragment_size) {
+		oops(compress, EINVAL, "requested fragment size %d is below min supported %d",
+			config->fragment_size, caps->min_fragment_size);
+		return false;
+	}
+	if (config->fragment_size > caps->max_fragment_size) {
+		oops(compress, EINVAL, "requested fragment size %d is above max supported %d",
+			config->fragment_size, caps->max_fragment_size);
+		return false;
+	}
+	if (config->fragments < caps->min_fragments) {
+		oops(compress, EINVAL, "requested fragments %d are below min supported %d",
+			config->fragments, caps->min_fragments);
+		return false;
+	}
+	if (config->fragments > caps->max_fragments) {
+		oops(compress, EINVAL, "requested fragments %d are above max supported %d",
+			config->fragments, caps->max_fragments);
+		return false;
+	}
+
+	/* TODO: match the codec properties */
+	return true;
+}
+
+static bool _is_codec_type_supported(int fd, struct snd_codec *codec)
 {
 	struct snd_compr_caps caps;
 	bool found = false;
 	unsigned int i;
 
-	if (ops->ioctl(data, SNDRV_COMPRESS_GET_CAPS, &caps)) {
+	if (ioctl(fd, SNDRV_COMPRESS_GET_CAPS, &caps)) {
 		oops(&bad_compress, errno, "cannot get device caps");
 		return false;
 	}
@@ -185,7 +218,7 @@ struct compress *compress_open(unsigned int card, unsigned int device,
 	struct compress *compress;
 	struct snd_compr_params params;
 	struct snd_compr_caps caps;
-	int compress_type;
+	char fn[256];
 
 	if (!config) {
 		oops(&bad_compress, EINVAL, "passed bad config");
@@ -204,6 +237,8 @@ struct compress *compress_open(unsigned int card, unsigned int device,
 	if (!compress->config)
 		goto input_fail;
 
+	snprintf(fn, sizeof(fn), "/dev/snd/comprC%uD%u", card, device);
+
 	compress->max_poll_wait_ms = DEFAULT_MAX_POLL_WAIT_MS;
 
 	compress->flags = flags;
@@ -212,22 +247,17 @@ struct compress *compress_open(unsigned int card, unsigned int device,
 		goto config_fail;
 	}
 
-	compress->snd_node = snd_utils_get_dev_node(card, device, NODE_COMPRESS);
-	compress_type = snd_utils_get_node_type(compress->snd_node);
-	if (compress_type == SND_NODE_TYPE_PLUGIN)
-		compress->ops = &compr_plug_ops;
-	else
-		compress->ops = &compr_hw_ops;
-
-	compress->fd = compress->ops->open(card, device, flags,
-									   &compress->data, compress->snd_node);
+	if (flags & COMPRESS_OUT) {
+		compress->fd = open(fn, O_RDONLY);
+	} else {
+		compress->fd = open(fn, O_WRONLY);
+	}
 	if (compress->fd < 0) {
-		oops(&bad_compress, errno, "cannot open card(%u) device(%u)",
-			card, device);
+		oops(&bad_compress, errno, "cannot open device '%s'", fn);
 		goto config_fail;
 	}
 
-	if (compress->ops->ioctl(compress->data, SNDRV_COMPRESS_GET_CAPS, &caps)) {
+	if (ioctl(compress->fd, SNDRV_COMPRESS_GET_CAPS, &caps)) {
 		oops(compress, errno, "cannot get device caps");
 		goto codec_fail;
 	}
@@ -251,7 +281,7 @@ struct compress *compress_open(unsigned int card, unsigned int device,
 	memcpy(compress->config, config, sizeof(*compress->config));
 	fill_compress_params(config, &params);
 
-	if (compress->ops->ioctl(compress->data, SNDRV_COMPRESS_SET_PARAMS, &params)) {
+	if (ioctl(compress->fd, SNDRV_COMPRESS_SET_PARAMS, &params)) {
 		oops(&bad_compress, errno, "cannot set device");
 		goto codec_fail;
 	}
@@ -259,8 +289,7 @@ struct compress *compress_open(unsigned int card, unsigned int device,
 	return compress;
 
 codec_fail:
-	snd_utils_put_dev_node(compress->snd_node);
-	compress->ops->close(compress->data);
+	close(compress->fd);
 	compress->fd = -1;
 config_fail:
 	free(compress->config);
@@ -274,8 +303,8 @@ void compress_close(struct compress *compress)
 	if (compress == &bad_compress)
 		return;
 
-	snd_utils_put_dev_node(compress->snd_node);
-	compress->ops->close(compress->data);
+	if (compress->fd >= 0)
+		close(compress->fd);
 	compress->running = 0;
 	compress->fd = -1;
 	free(compress->config);
@@ -291,7 +320,7 @@ int compress_get_hpointer(struct compress *compress,
 	if (!is_compress_ready(compress))
 		return oops(compress, ENODEV, "device not ready");
 
-	if (compress->ops->ioctl(compress->data, SNDRV_COMPRESS_AVAIL, &kavail))
+	if (ioctl(compress->fd, SNDRV_COMPRESS_AVAIL, &kavail))
 		return oops(compress, errno, "cannot get avail");
 	if (0 == kavail.tstamp.sampling_rate)
 		return oops(compress, ENODATA, "sample rate unknown");
@@ -311,7 +340,7 @@ int compress_get_tstamp(struct compress *compress,
 	if (!is_compress_ready(compress))
 		return oops(compress, ENODEV, "device not ready");
 
-	if (compress->ops->ioctl(compress->data, SNDRV_COMPRESS_TSTAMP, &ktstamp))
+	if (ioctl(compress->fd, SNDRV_COMPRESS_TSTAMP, &ktstamp))
 		return oops(compress, errno, "cannot get tstamp");
 
 	*samples = ktstamp.pcm_io_frames;
@@ -332,11 +361,12 @@ int compress_write(struct compress *compress, const void *buf, unsigned int size
 		return oops(compress, EINVAL, "Invalid flag set");
 	if (!is_compress_ready(compress))
 		return oops(compress, ENODEV, "device not ready");
+	fds.fd = compress->fd;
 	fds.events = POLLOUT;
 
 	/*TODO: treat auto start here first */
 	while (size) {
-		if (compress->ops->ioctl(compress->data, SNDRV_COMPRESS_AVAIL, &avail))
+		if (ioctl(compress->fd, SNDRV_COMPRESS_AVAIL, &avail))
 			return oops(compress, errno, "cannot get avail");
 
 		/* We can write if we have at least one fragment available
@@ -347,14 +377,13 @@ int compress_write(struct compress *compress, const void *buf, unsigned int size
 			if (compress->nonblocking)
 				return total;
 
-			ret = compress->ops->poll(compress->data, &fds, 1,
-								compress->max_poll_wait_ms);
+			ret = poll(&fds, 1, compress->max_poll_wait_ms);
 			if (fds.revents & POLLERR) {
 				return oops(compress, EIO, "poll returned error!");
 			}
 			/* A pause will cause -EBADFD or zero.
 			 * This is not an error, just stop writing */
-			if ((ret == 0) || (ret < 0 && errno == EBADFD))
+			if ((ret == 0) || (ret == -EBADFD))
 				break;
 			if (ret < 0)
 				return oops(compress, errno, "poll error");
@@ -367,13 +396,12 @@ int compress_write(struct compress *compress, const void *buf, unsigned int size
 			to_write =  avail.avail;
 		else
 			to_write = size;
-		written = compress->ops->write(compress->data, cbuf, to_write);
-		if (written < 0) {
-			/* If play was paused the write returns -EBADFD */
-			if (errno == EBADFD)
-				break;
+		written = write(compress->fd, cbuf, to_write);
+		/* If play was paused the write returns -EBADFD */
+		if (written == -EBADFD)
+			break;
+		if (written < 0)
 			return oops(compress, errno, "write failed!");
-		}
 
 		size -= written;
 		cbuf += written;
@@ -395,10 +423,11 @@ int compress_read(struct compress *compress, void *buf, unsigned int size)
 		return oops(compress, EINVAL, "Invalid flag set");
 	if (!is_compress_ready(compress))
 		return oops(compress, ENODEV, "device not ready");
+	fds.fd = compress->fd;
 	fds.events = POLLIN;
 
 	while (size) {
-		if (compress->ops->ioctl(compress->data, SNDRV_COMPRESS_AVAIL, &avail))
+		if (ioctl(compress->fd, SNDRV_COMPRESS_AVAIL, &avail))
 			return oops(compress, errno, "cannot get avail");
 
 		if ( (avail.avail < frag_size) && (avail.avail < size) ) {
@@ -408,14 +437,13 @@ int compress_read(struct compress *compress, void *buf, unsigned int size)
 			if (compress->nonblocking)
 				return total;
 
-			ret = compress->ops->poll(compress->data, &fds, 1,
-							compress->max_poll_wait_ms);
+			ret = poll(&fds, 1, compress->max_poll_wait_ms);
 			if (fds.revents & POLLERR) {
 				return oops(compress, EIO, "poll returned error!");
 			}
 			/* A pause will cause -EBADFD or zero.
 			 * This is not an error, just stop reading */
-			if ((ret == 0) || (ret < 0 && errno == EBADFD))
+			if ((ret == 0) || (ret == -EBADFD))
 				break;
 			if (ret < 0)
 				return oops(compress, errno, "poll error");
@@ -428,13 +456,12 @@ int compress_read(struct compress *compress, void *buf, unsigned int size)
 			to_read = avail.avail;
 		else
 			to_read = size;
-		num_read = compress->ops->read(compress->data, cbuf, to_read);
-		if (num_read < 0) {
-			/* If play was paused the read returns -EBADFD */
-			if (errno == EBADFD)
-				break;
+		num_read = read(compress->fd, cbuf, to_read);
+		/* If play was paused the read returns -EBADFD */
+		if (num_read == -EBADFD)
+			break;
+		if (num_read < 0)
 			return oops(compress, errno, "read failed!");
-		}
 
 		size -= num_read;
 		cbuf += num_read;
@@ -448,7 +475,7 @@ int compress_start(struct compress *compress)
 {
 	if (!is_compress_ready(compress))
 		return oops(compress, ENODEV, "device not ready");
-	if (compress->ops->ioctl(compress->data, SNDRV_COMPRESS_START))
+	if (ioctl(compress->fd, SNDRV_COMPRESS_START))
 		return oops(compress, errno, "cannot start the stream");
 	compress->running = 1;
 	return 0;
@@ -459,7 +486,7 @@ int compress_stop(struct compress *compress)
 {
 	if (!is_compress_running(compress))
 		return oops(compress, ENODEV, "device not ready");
-	if (compress->ops->ioctl(compress->data, SNDRV_COMPRESS_STOP))
+	if (ioctl(compress->fd, SNDRV_COMPRESS_STOP))
 		return oops(compress, errno, "cannot stop the stream");
 	return 0;
 }
@@ -468,14 +495,14 @@ int compress_pause(struct compress *compress)
 {
 	if (!is_compress_running(compress))
 		return oops(compress, ENODEV, "device not ready");
-	if (compress->ops->ioctl(compress->data, SNDRV_COMPRESS_PAUSE))
+	if (ioctl(compress->fd, SNDRV_COMPRESS_PAUSE))
 		return oops(compress, errno, "cannot pause the stream");
 	return 0;
 }
 
 int compress_resume(struct compress *compress)
 {
-	if (compress->ops->ioctl(compress->data, SNDRV_COMPRESS_RESUME))
+	if (ioctl(compress->fd, SNDRV_COMPRESS_RESUME))
 		return oops(compress, errno, "cannot resume the stream");
 	return 0;
 }
@@ -484,7 +511,7 @@ int compress_drain(struct compress *compress)
 {
 	if (!is_compress_running(compress))
 		return oops(compress, ENODEV, "device not ready");
-	if (compress->ops->ioctl(compress->data, SNDRV_COMPRESS_DRAIN))
+	if (ioctl(compress->fd, SNDRV_COMPRESS_DRAIN))
 		return oops(compress, errno, "cannot drain the stream");
 	return 0;
 }
@@ -496,7 +523,7 @@ int compress_partial_drain(struct compress *compress)
 
 	if (!compress->next_track)
 		return oops(compress, EPERM, "next track not signalled");
-	if (compress->ops->ioctl(compress->data, SNDRV_COMPRESS_PARTIAL_DRAIN))
+	if (ioctl(compress->fd, SNDRV_COMPRESS_PARTIAL_DRAIN))
 		return oops(compress, errno, "cannot drain the stream\n");
 	compress->next_track = 0;
 	return 0;
@@ -509,7 +536,7 @@ int compress_next_track(struct compress *compress)
 
 	if (!compress->gapless_metadata)
 		return oops(compress, EPERM, "metadata not set");
-	if (compress->ops->ioctl(compress->data, SNDRV_COMPRESS_NEXT_TRACK))
+	if (ioctl(compress->fd, SNDRV_COMPRESS_NEXT_TRACK))
 		return oops(compress, errno, "cannot set next track\n");
 	compress->next_track = 1;
 	compress->gapless_metadata = 0;
@@ -534,12 +561,12 @@ int compress_set_gapless_metadata(struct compress *compress,
 
 	metadata.key = SNDRV_COMPRESS_ENCODER_PADDING;
 	metadata.value[0] = mdata->encoder_padding;
-	if (compress->ops->ioctl(compress->data, SNDRV_COMPRESS_SET_METADATA, &metadata))
+	if (ioctl(compress->fd, SNDRV_COMPRESS_SET_METADATA, &metadata))
 		return oops(compress, errno, "can't set metadata for stream\n");
 
 	metadata.key = SNDRV_COMPRESS_ENCODER_DELAY;
 	metadata.value[0] = mdata->encoder_delay;
-	if (compress->ops->ioctl(compress->data, SNDRV_COMPRESS_SET_METADATA, &metadata))
+	if (ioctl(compress->fd, SNDRV_COMPRESS_SET_METADATA, &metadata))
 		return oops(compress, errno, "can't set metadata for stream\n");
 	compress->gapless_metadata = 1;
 	return 0;
@@ -561,27 +588,25 @@ int compress_set_next_track_param(struct compress *compress,
 bool is_codec_supported(unsigned int card, unsigned int device,
 		unsigned int flags, struct snd_codec *codec)
 {
-	struct compress_ops *ops;
-	void *snd_node, *data;
+	unsigned int dev_flag;
 	bool ret;
-	int compress_type, fd;
+	int fd;
+	char fn[256];
+
+	snprintf(fn, sizeof(fn), "/dev/snd/comprC%uD%u", card, device);
 
-	snd_node = snd_utils_get_dev_node(card, device, NODE_COMPRESS);
-	compress_type = snd_utils_get_node_type(snd_node);
-	if (compress_type == SND_NODE_TYPE_PLUGIN)
-		ops = &compr_plug_ops;
+	if (flags & COMPRESS_OUT)
+		dev_flag = O_RDONLY;
 	else
-		ops = &compr_hw_ops;
+		dev_flag = O_WRONLY;
 
-	fd = ops->open(card, device, flags, &data, NULL);
+	fd = open(fn, dev_flag);
 	if (fd < 0)
-		return oops(&bad_compress, errno, "cannot open card %u, device %u",
-					card, device);
+		return oops(&bad_compress, errno, "cannot open device '%s'", fn);
 
-	ret = _is_codec_type_supported(ops, data, codec);
+	ret = _is_codec_type_supported(fd, codec);
 
-	snd_utils_put_dev_node(snd_node);
-	ops->close(data);
+	close(fd);
 	return ret;
 }
 
@@ -600,9 +625,10 @@ int compress_wait(struct compress *compress, int timeout_ms)
 	struct pollfd fds;
 	int ret;
 
+	fds.fd = compress->fd;
 	fds.events = POLLOUT | POLLIN;
 
-	ret = compress->ops->poll(compress->data, &fds, 1, timeout_ms);
+	ret = poll(&fds, 1, timeout_ms);
 	if (ret > 0) {
 		if (fds.revents & POLLERR)
 			return oops(compress, EIO, "poll returned error!");
diff --git a/compress_hw.c b/compress_hw.c
deleted file mode 100644
index b2252cc..0000000
--- a/compress_hw.c
+++ /dev/null
@@ -1,138 +0,0 @@
-/* compress_hw.c
-**
-** Copyright (c) 2019, The Linux Foundation. All rights reserved.
-**
-** Redistribution and use in source and binary forms, with or without
-** modification, are permitted provided that the following conditions are
-** met:
-**   * Redistributions of source code must retain the above copyright
-**     notice, this list of conditions and the following disclaimer.
-**   * Redistributions in binary form must reproduce the above
-**     copyright notice, this list of conditions and the following
-**     disclaimer in the documentation and/or other materials provided
-**     with the distribution.
-**   * Neither the name of The Linux Foundation nor the names of its
-**     contributors may be used to endorse or promote products derived
-**     from this software without specific prior written permission.
-**
-** THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
-** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
-** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
-** ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
-** BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
-** BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
-** OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
-** IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-**/
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <fcntl.h>
-#include <stdarg.h>
-#include <string.h>
-#include <stdbool.h>
-#include <errno.h>
-#include <unistd.h>
-#include <poll.h>
-
-#include <sys/ioctl.h>
-#include <linux/ioctl.h>
-#include <sound/asound.h>
-#include "tinycompress/tinycompress.h"
-#include "compress_ops.h"
-
-struct compress_hw_data {
-	unsigned int card;
-	unsigned int device;
-	unsigned int fd;
-};
-
-static int compress_hw_poll(void *data, struct pollfd *fds,
-				nfds_t nfds, int timeout)
-{
-	struct compress_hw_data *hw_data = data;
-
-	fds->fd = hw_data->fd;
-	return poll(fds, nfds, timeout);
-}
-
-static int compress_hw_write(void *data, const void *buf, size_t size)
-{
-	struct compress_hw_data *hw_data = data;
-
-	return write(hw_data->fd, buf, size);
-}
-
-static int compress_hw_read(void *data, void *buf, size_t size)
-{
-	struct compress_hw_data *hw_data = data;
-
-	return read(hw_data->fd, buf, size);
-}
-
-static int compress_hw_ioctl(void *data, unsigned int cmd, ...)
-{
-	struct compress_hw_data *hw_data = data;
-	va_list ap;
-	void *arg;
-
-	va_start(ap, cmd);
-	arg = va_arg(ap, void *);
-	va_end(ap);
-
-	return ioctl(hw_data->fd, cmd, arg);
-}
-
-static void compress_hw_close(void *data)
-{
-	struct compress_hw_data *hw_data = data;
-
-	if (hw_data->fd > 0)
-		close(hw_data->fd);
-
-	free(hw_data);
-}
-
-static int compress_hw_open(unsigned int card, unsigned int device,
-		unsigned int flags, void **data, __unused void *node)
-{
-	struct compress_hw_data *hw_data;
-	char fn[256];
-	int fd;
-
-	hw_data = calloc(1, sizeof(*hw_data));
-	if (!hw_data) {
-		return -ENOMEM;
-	}
-
-	snprintf(fn, sizeof(fn), "/dev/snd/comprC%uD%u", card, device);
-
-	if (flags & COMPRESS_OUT)
-		fd = open(fn,  O_RDONLY);
-	else
-		fd = open(fn, O_WRONLY);
-
-	if (fd < 0) {
-		return fd;
-	}
-
-	hw_data->card = card;
-	hw_data->device = device;
-	hw_data->fd = fd;
-
-	*data = hw_data;
-
-	return fd;
-}
-
-struct compress_ops compr_hw_ops = {
-	.open = compress_hw_open,
-	.close = compress_hw_close,
-	.ioctl = compress_hw_ioctl,
-	.read = compress_hw_read,
-	.write = compress_hw_write,
-	.poll = compress_hw_poll,
-};
diff --git a/compress_ops.h b/compress_ops.h
deleted file mode 100644
index a3147b7..0000000
--- a/compress_ops.h
+++ /dev/null
@@ -1,50 +0,0 @@
-/* compress.h
-**
-** Copyright (c) 2019, The Linux Foundation. All rights reserved.
-**
-** Redistribution and use in source and binary forms, with or without
-** modification, are permitted provided that the following conditions are
-** met:
-**   * Redistributions of source code must retain the above copyright
-**     notice, this list of conditions and the following disclaimer.
-**   * Redistributions in binary form must reproduce the above
-**     copyright notice, this list of conditions and the following
-**     disclaimer in the documentation and/or other materials provided
-**     with the distribution.
-**   * Neither the name of The Linux Foundation nor the names of its
-**     contributors may be used to endorse or promote products derived
-**     from this software without specific prior written permission.
-**
-** THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
-** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
-** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
-** ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
-** BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
-** BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
-** OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
-** IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-**/
-
-#ifndef __COMPRESS_H__
-#define __COMPRESS_H__
-
-#include <poll.h>
-
-#include "sound/compress_params.h"
-#include "sound/compress_offload.h"
-
-struct compress_ops {
-	int (*open) (unsigned int card, unsigned int device,
-			unsigned int flags, void **data, void *node);
-	void (*close) (void *data);
-	int (*ioctl) (void *data, unsigned int cmd, ...);
-	int (*read) (void *data, void *buf, size_t size);
-	int (*write) (void *data, const void *buf, size_t size);
-	int (*poll) (void *data, struct pollfd *fds, nfds_t nfds,
-				 int timeout);
-};
-
-#endif /* end of __PCM_H__ */
diff --git a/compress_plugin.c b/compress_plugin.c
deleted file mode 100644
index d445ae9..0000000
--- a/compress_plugin.c
+++ /dev/null
@@ -1,423 +0,0 @@
-/* compress_plugin.c
-**
-** Copyright (c) 2019, The Linux Foundation. All rights reserved.
-**
-** Redistribution and use in source and binary forms, with or without
-** modification, are permitted provided that the following conditions are
-** met:
-**   * Redistributions of source code must retain the above copyright
-**     notice, this list of conditions and the following disclaimer.
-**   * Redistributions in binary form must reproduce the above
-**     copyright notice, this list of conditions and the following
-**     disclaimer in the documentation and/or other materials provided
-**     with the distribution.
-**   * Neither the name of The Linux Foundation nor the names of its
-**     contributors may be used to endorse or promote products derived
-**     from this software without specific prior written permission.
-**
-** THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
-** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
-** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
-** ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
-** BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
-** BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
-** OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
-** IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-**/
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdint.h>
-#include <fcntl.h>
-#include <stdarg.h>
-#include <string.h>
-#include <errno.h>
-#include <unistd.h>
-#include <poll.h>
-#include <dlfcn.h>
-
-#include <sys/ioctl.h>
-#include <linux/ioctl.h>
-#include <sound/asound.h>
-#include "tinycompress/compress_plugin.h"
-#include "sound/compress_offload.h"
-#include "compress_ops.h"
-#include "snd_utils.h"
-
-#define U32_MAX	((uint32_t)~0U)
-
-enum {
-	COMPRESS_PLUG_STATE_OPEN,
-	COMPRESS_PLUG_STATE_SETUP,
-	COMPRESS_PLUG_STATE_PREPARED,
-	COMPRESS_PLUG_STATE_PAUSE,
-	COMPRESS_PLUG_STATE_RUNNING,
-};
-
-struct compress_plug_data {
-	unsigned int card;
-	unsigned int device;
-	unsigned int fd;
-	unsigned int flags;
-
-	void *dl_hdl;
-	COMPRESS_PLUGIN_OPEN_FN_PTR();
-
-	struct compress_plugin *plugin;
-	void *dev_node;
-};
-
-static int compress_plug_get_caps(struct compress_plug_data *plug_data,
-		struct snd_compr_caps *caps)
-{
-	struct compress_plugin *plugin = plug_data->plugin;
-
-	return plugin->ops->get_caps(plugin, caps);
-}
-
-static int compress_plug_set_params(struct compress_plug_data *plug_data,
-		struct snd_compr_params *params)
-{
-	struct compress_plugin *plugin = plug_data->plugin;
-	int rc;
-
-	if (plugin->state != COMPRESS_PLUG_STATE_OPEN)
-		return -EBADFD;
-
-	if (params->buffer.fragment_size == 0 ||
-	   params->buffer.fragments > U32_MAX / params->buffer.fragment_size ||
-	   params->buffer.fragments == 0)
-		return -EINVAL;
-
-	rc = plugin->ops->set_params(plugin, params);
-	if (!rc)
-		plugin->state = COMPRESS_PLUG_STATE_SETUP;
-
-	return rc;
-}
-
-static int compress_plug_avail(struct compress_plug_data *plug_data,
-		struct snd_compr_avail *avail)
-{
-	struct compress_plugin *plugin = plug_data->plugin;
-
-	return plugin->ops->avail(plugin, avail);
-}
-
-static int compress_plug_tstamp(struct compress_plug_data *plug_data,
-		struct snd_compr_tstamp *tstamp)
-{
-	struct compress_plugin *plugin = plug_data->plugin;
-
-	if (plugin->state != COMPRESS_PLUG_STATE_SETUP)
-		return -EBADFD;
-
-	return plugin->ops->tstamp(plugin, tstamp);
-}
-
-static int compress_plug_start(struct compress_plug_data *plug_data)
-{
-	struct compress_plugin *plugin = plug_data->plugin;
-	int rc;
-
-	/* for playback moved to prepare in first write */
-	/* for capture: move to prepare state set params */
-	 /* TODO: add direction in set params */
-	if (plugin->state != COMPRESS_PLUG_STATE_PREPARED)
-		return -EBADFD;
-
-	rc = plugin->ops->start(plugin);
-	if (!rc)
-		plugin->state = COMPRESS_PLUG_STATE_RUNNING;
-
-	return rc;
-}
-
-static int compress_plug_stop(struct compress_plug_data *plug_data)
-{
-	struct compress_plugin *plugin = plug_data->plugin;
-	int rc;
-
-	if (plugin->state == COMPRESS_PLUG_STATE_PREPARED ||
-		plugin->state == COMPRESS_PLUG_STATE_SETUP)
-		return -EBADFD;
-
-	rc = plugin->ops->stop(plugin);
-	if (!rc)
-		plugin->state = COMPRESS_PLUG_STATE_SETUP;
-
-	return rc;
-}
-
-static int compress_plug_pause(struct compress_plug_data *plug_data)
-{
-	struct compress_plugin *plugin = plug_data->plugin;
-	int rc;
-
-	if (plugin->state != COMPRESS_PLUG_STATE_RUNNING)
-		return -EBADFD;
-
-	rc = plugin->ops->pause(plugin);
-	if (!rc)
-		plugin->state = COMPRESS_PLUG_STATE_PAUSE;
-
-	return rc;
-}
-
-static int compress_plug_resume(struct compress_plug_data *plug_data)
-{
-	struct compress_plugin *plugin = plug_data->plugin;
-	int rc;
-
-	if (plugin->state != COMPRESS_PLUG_STATE_PAUSE)
-		return -EBADFD;
-
-	rc = plugin->ops->resume(plugin);
-	if (!rc)
-		plugin->state = COMPRESS_PLUG_STATE_RUNNING;
-
-	return rc;
-}
-
-static int compress_plug_drain(struct compress_plug_data *plug_data)
-{
-	struct compress_plugin *plugin = plug_data->plugin;
-
-	/* check if we will allow in pause */
-	if (plugin->state != COMPRESS_PLUG_STATE_RUNNING)
-		return -EBADFD;
-
-	return plugin->ops->drain(plugin);
-}
-
-static int compress_plug_partial_drain(struct compress_plug_data *plug_data)
-{
-	struct compress_plugin *plugin = plug_data->plugin;
-
-	 /* check if we will allow in pause */
-	if (plugin->state != COMPRESS_PLUG_STATE_RUNNING)
-		return -EBADFD;
-
-	return plugin->ops->partial_drain(plugin);
-}
-
-static int compress_plug_next_track(struct compress_plug_data *plug_data)
-{
-	struct compress_plugin *plugin = plug_data->plugin;
-
-	/* transion to next track applied to running stream only */
-	if (plugin->state != COMPRESS_PLUG_STATE_RUNNING)
-		return -EBADFD;
-
-	return plugin->ops->next_track(plugin);
-}
-
-static int compress_plug_ioctl(void *data, unsigned int cmd, ...)
-{
-	struct compress_plug_data *plug_data = data;
-	struct compress_plugin *plugin = plug_data->plugin;
-	int ret = 0;
-	va_list ap;
-	void *arg;
-
-	va_start(ap, cmd);
-	arg = va_arg(ap, void *);
-	va_end(ap);
-
-	switch (cmd) {
-	case SNDRV_COMPRESS_IOCTL_VERSION:
-		*((int*)arg) = SNDRV_COMPRESS_VERSION;
-		break;
-	case SNDRV_COMPRESS_GET_CAPS:
-		ret = compress_plug_get_caps(plug_data, arg);
-		break;
-	case SNDRV_COMPRESS_SET_PARAMS:
-		ret = compress_plug_set_params(plug_data, arg);
-		break;
-	case SNDRV_COMPRESS_AVAIL:
-		ret = compress_plug_avail(plug_data, arg);
-		break;
-	case SNDRV_COMPRESS_TSTAMP:
-		ret = compress_plug_tstamp(plug_data, arg);
-		break;
-	case SNDRV_COMPRESS_START:
-		ret = compress_plug_start(plug_data);
-		break;
-	case SNDRV_COMPRESS_STOP:
-		ret = compress_plug_stop(plug_data);
-		break;
-	case SNDRV_COMPRESS_PAUSE:
-		ret = compress_plug_pause(plug_data);
-		break;
-	case SNDRV_COMPRESS_RESUME:
-		ret = compress_plug_resume(plug_data);
-		break;
-	case SNDRV_COMPRESS_DRAIN:
-		ret = compress_plug_drain(plug_data);
-		break;
-	case SNDRV_COMPRESS_PARTIAL_DRAIN:
-		ret = compress_plug_partial_drain(plug_data);
-		break;
-	case SNDRV_COMPRESS_NEXT_TRACK:
-		ret = compress_plug_next_track(plug_data);
-		break;
-	default:
-		if (plugin->ops->ioctl)
-			ret = plugin->ops->ioctl(plugin, cmd, arg);
-		else
-			ret = -EINVAL;
-		break;
-	}
-
-	return ret;
-}
-
-static int compress_plug_poll(void *data, struct pollfd *fds,
-				nfds_t nfds, int timeout)
-{
-	struct compress_plug_data *plug_data = data;
-	struct compress_plugin *plugin = plug_data->plugin;
-
-	if (plugin->state != COMPRESS_PLUG_STATE_RUNNING)
-		return -EBADFD;
-
-	return plugin->ops->poll(plugin, fds, nfds, timeout);
-}
-
-
-static int compress_plug_read(void *data, void *buf, size_t size)
-{
-	struct compress_plug_data *plug_data = data;
-	struct compress_plugin *plugin = plug_data->plugin;
-
-	if (plugin->state != COMPRESS_PLUG_STATE_RUNNING &&
-		plugin->state != COMPRESS_PLUG_STATE_SETUP)
-		return -EBADFD;
-
-	return plugin->ops->read(plugin, buf, size);
-}
-
-static int compress_plug_write(void *data, const void *buf, size_t size)
-{
-	struct compress_plug_data *plug_data = data;
-	struct compress_plugin *plugin = plug_data->plugin;
-	int rc;
-
-	if (plugin->state != COMPRESS_PLUG_STATE_SETUP &&
-	    plugin->state != COMPRESS_PLUG_STATE_PREPARED &&
-	    plugin->state != COMPRESS_PLUG_STATE_RUNNING)
-		return -EBADFD;
-
-	rc = plugin->ops->write(plugin, buf, size);
-	if ((rc > 0) && (plugin->state == COMPRESS_PLUG_STATE_SETUP))
-		plugin->state = COMPRESS_PLUG_STATE_PREPARED;
-
-	return rc;
-}
-
-static void compress_plug_close(void *data)
-{
-	struct compress_plug_data *plug_data = data;
-	struct compress_plugin *plugin = plug_data->plugin;
-
-	plugin->ops->close(plugin);
-	dlclose(plug_data->dl_hdl);
-
-	free(plug_data);
-}
-
-static int compress_plug_open(unsigned int card, unsigned int device,
-			unsigned int flags, void **data, void *node)
-{
-	struct compress_plug_data *plug_data;
-	const char *err = NULL;
-	void *dl_hdl;
-	int rc = 0;
-	char *so_name, *open_fn, token[80], *name;
-
-	plug_data = calloc(1, sizeof(*plug_data));
-	if (!plug_data) {
-		return -ENOMEM;
-	}
-
-	rc = snd_utils_get_str(node, "so-name", &so_name);
-	if (rc) {
-		fprintf(stderr, "%s: failed to get plugin lib name\n",
-				__func__);
-		goto err_get_lib;
-	}
-
-	dl_hdl = dlopen(so_name, RTLD_NOW);
-	if (!dl_hdl) {
-		fprintf(stderr, "%s: unable to open %s, error: %s\n",
-					__func__, so_name, dlerror());
-		goto err_dl_open;
-	} else {
-		fprintf(stderr, "%s: dlopen successful for %s\n",
-					__func__, so_name);
-	}
-
-	sscanf(so_name, "lib%s", token);
-	name = strtok(token, ".");
-	open_fn = calloc(1, strlen(name) + strlen("_open") + 1);
-	if (!open_fn) {
-		rc = -ENOMEM;
-		goto err_open_fn;
-	}
-
-	strncpy(open_fn, name, strlen(name) + 1);
-	strcat(open_fn, "_open");
-
-	plug_data->plugin_open_fn = dlsym(dl_hdl, open_fn);
-	err = dlerror();
-
-	if (err) {
-		fprintf(stderr, "%s: dlsym to open fn failed, err = '%s'\n",
-				__func__, err);
-		goto err_dlsym;
-	}
-
-	rc = plug_data->plugin_open_fn(&plug_data->plugin,
-					card, device, flags);
-	if (rc) {
-		fprintf(stderr, "%s: failed to open plugin\n", __func__);
-		goto err_dlsym;
-	}
-
-	/* Call snd-card-def to get card and compress nodes */
-	/* Check how to manage fd for plugin */
-
-	plug_data->dl_hdl = dl_hdl;
-	plug_data->card = card;
-	plug_data->device = device;
-	plug_data->dev_node = node;
-	plug_data->flags = flags;
-
-	*data = plug_data;
-
-	plug_data->plugin->state = COMPRESS_PLUG_STATE_OPEN;
-
-	return 0;
-
-err_dlsym:
-	free(open_fn);
-err_open_fn:
-	dlclose(dl_hdl);
-err_get_lib:
-err_dl_open:
-	free(plug_data);
-
-	return rc;
-}
-
-struct compress_ops compr_plug_ops = {
-	.open = compress_plug_open,
-	.close = compress_plug_close,
-	.ioctl = compress_plug_ioctl,
-	.read = compress_plug_read,
-	.write = compress_plug_write,
-	.poll = compress_plug_poll,
-};
diff --git a/include/tinycompress/compress_plugin.h b/include/tinycompress/compress_plugin.h
deleted file mode 100644
index abd59f2..0000000
--- a/include/tinycompress/compress_plugin.h
+++ /dev/null
@@ -1,89 +0,0 @@
-/* compress_plugin.h
-**
-** Copyright (c) 2019, The Linux Foundation. All rights reserved.
-**
-** Redistribution and use in source and binary forms, with or without
-** modification, are permitted provided that the following conditions are
-** met:
-**   * Redistributions of source code must retain the above copyright
-**     notice, this list of conditions and the following disclaimer.
-**   * Redistributions in binary form must reproduce the above
-**     copyright notice, this list of conditions and the following
-**     disclaimer in the documentation and/or other materials provided
-**     with the distribution.
-**   * Neither the name of The Linux Foundation nor the names of its
-**     contributors may be used to endorse or promote products derived
-**     from this software without specific prior written permission.
-**
-** THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
-** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
-** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
-** ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
-** BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
-** BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
-** OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
-** IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-**/
-
-#ifndef __COMPRESS_PLUGIN_H__
-#define __COMPRESS_PLUGIN_H__
-
-#include "sound/compress_params.h"
-#include "sound/compress_offload.h"
-
-#define COMPRESS_PLUGIN_OPEN_FN(name)                    \
-	int name##_open(struct compress_plugin **plugin,     \
-			unsigned int card,                   \
-			unsigned int device,                  \
-			unsigned int flags)
-
-#define COMPRESS_PLUGIN_OPEN_FN_PTR()                        \
-	int (*plugin_open_fn) (struct compress_plugin **plugin,  \
-				unsigned int card,                \
-				unsigned int device,               \
-				unsigned int flags);
-
-struct compress_plugin;
-
-struct compress_plugin_ops {
-	void (*close) (struct compress_plugin *plugin);
-	int (*get_caps) (struct compress_plugin *plugin,
-					 struct snd_compr_caps *caps);
-	int (*set_params) (struct compress_plugin *plugin,
-					   struct snd_compr_params *params);
-	int (*avail) (struct compress_plugin *plugin,
-				  struct snd_compr_avail *avail);
-	int (*tstamp) (struct compress_plugin *plugin,
-					 struct snd_compr_tstamp *tstamp);
-	int (*write) (struct compress_plugin *plugin,
-					 const void *buf, size_t size);
-	int (*read) (struct compress_plugin *plugin,
-					 void *buf, size_t size);
-	int (*start) (struct compress_plugin *plugin);
-	int (*stop) (struct compress_plugin *plugin);
-	int (*pause) (struct compress_plugin *plugin);
-	int (*resume) (struct compress_plugin *plugin);
-	int (*drain) (struct compress_plugin *plugin);
-	int (*partial_drain) (struct compress_plugin *plugin);
-	int (*next_track) (struct compress_plugin *plugin);
-	int (*ioctl) (struct compress_plugin *plugin, int cmd, ...);
-	int (*poll) (struct compress_plugin *plugin,
-			struct pollfd *fds, nfds_t nfds, int timeout);
-};
-
-struct compress_plugin {
-	unsigned int card;
-
-	struct compress_plugin_ops *ops;
-
-	void *node;
-	int mode;
-	void *priv;
-
-	unsigned int state;
-};
-
-#endif /* end of __COMPRESS_PLUGIN_H__ */
diff --git a/snd_utils.c b/snd_utils.c
deleted file mode 100644
index 2c244cc..0000000
--- a/snd_utils.c
+++ /dev/null
@@ -1,149 +0,0 @@
-/* snd_utils.c
-**
-** Copyright (c) 2019, The Linux Foundation. All rights reserved.
-**
-** Redistribution and use in source and binary forms, with or without
-** modification, are permitted provided that the following conditions are
-** met:
-**   * Redistributions of source code must retain the above copyright
-**     notice, this list of conditions and the following disclaimer.
-**   * Redistributions in binary form must reproduce the above
-**     copyright notice, this list of conditions and the following
-**     disclaimer in the documentation and/or other materials provided
-**     with the distribution.
-**   * Neither the name of The Linux Foundation nor the names of its
-**     contributors may be used to endorse or promote products derived
-**     from this software without specific prior written permission.
-**
-** THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
-** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
-** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
-** ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
-** BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
-** BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
-** OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
-** IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-**/
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <errno.h>
-#include "snd_utils.h"
-
-#define SND_DLSYM(h, p, s, err) \
-do {                            \
-	err = 0;                    \
-	p = dlsym(h, s);            \
-	if (!p)                     \
-		err = -ENODEV;          \
-} while(0)
-
-int snd_utils_get_int(struct snd_node *node, const char *prop, int *val)
-{
-	if (!node || !node->card_node || !node->dev_node)
-		return SND_NODE_TYPE_HW;
-
-	return node->get_int(node->dev_node, prop, val);
-}
-
-int snd_utils_get_str(struct snd_node *node, const char *prop, char **val)
-{
-	if (!node || !node->card_node || !node->dev_node)
-		return SND_NODE_TYPE_HW;
-
-	return node->get_str(node->dev_node, prop, val);
-}
-
-void snd_utils_put_dev_node(struct snd_node *node)
-{
-	if (!node)
-		return;
-
-	if (node->card_node)
-		node->put_card(node->card_node);
-
-	if (node->dl_hdl)
-		dlclose(node->dl_hdl);
-
-	free(node);
-}
-
-enum snd_node_type snd_utils_get_node_type(struct snd_node *node)
-{
-	int val = SND_NODE_TYPE_HW;
-
-	if (!node || !node->card_node || !node->dev_node)
-		return SND_NODE_TYPE_HW;
-
-	node->get_int(node->dev_node, "type", &val);
-
-	return val;
-};
-
-
-static int snd_utils_resolve_symbols(struct snd_node *node)
-{
-	void *dl = node->dl_hdl;
-	int err;
-
-	SND_DLSYM(dl, node->get_card, "snd_card_def_get_card", err);
-	if (err)
-		goto done;
-	SND_DLSYM(dl, node->put_card, "snd_card_def_put_card", err);
-	if (err)
-		goto done;
-	SND_DLSYM(dl, node->get_node, "snd_card_def_get_node", err);
-	if (err)
-		goto done;
-	SND_DLSYM(dl, node->get_int, "snd_card_def_get_int", err);
-	if (err)
-		goto done;
-	SND_DLSYM(dl, node->get_str, "snd_card_def_get_str", err);
-
-done:
-	return err;
-}
-
-struct snd_node *snd_utils_get_dev_node(unsigned int card,
-		unsigned int device, int dev_type)
-{
-	struct snd_node *node;
-	int rc = 0;
-
-	node = calloc(1, sizeof(*node));
-	if (!node)
-		return NULL;
-
-	node->dl_hdl = dlopen("libsndcardparser.so", RTLD_NOW);
-	if (!node->dl_hdl) {
-		goto err_dl_open;
-	}
-
-	rc = snd_utils_resolve_symbols(node);
-	if (rc < 0)
-		goto err_resolve_symbols;
-
-	node->card_node = node->get_card(card);
-	if (!node->card_node)
-		goto err_resolve_symbols;
-
-	node->dev_node = node->get_node(node->card_node,
-					device, dev_type);
-	if (!node->dev_node)
-		goto err_get_node;
-
-	return node;
-
-err_get_node:
-	node->put_card(node->card_node);
-
-err_resolve_symbols:
-	dlclose(node->dl_hdl);
-
-err_dl_open:
-	free(node);
-	return NULL;
-}
diff --git a/snd_utils.h b/snd_utils.h
deleted file mode 100644
index d00f7f2..0000000
--- a/snd_utils.h
+++ /dev/null
@@ -1,72 +0,0 @@
-/* snd_utils.h
-**
-** Copyright (c) 2019, The Linux Foundation. All rights reserved.
-**
-** Redistribution and use in source and binary forms, with or without
-** modification, are permitted provided that the following conditions are
-** met:
-**   * Redistributions of source code must retain the above copyright
-**     notice, this list of conditions and the following disclaimer.
-**   * Redistributions in binary form must reproduce the above
-**     copyright notice, this list of conditions and the following
-**     disclaimer in the documentation and/or other materials provided
-**     with the distribution.
-**   * Neither the name of The Linux Foundation nor the names of its
-**     contributors may be used to endorse or promote products derived
-**     from this software without specific prior written permission.
-**
-** THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
-** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
-** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
-** ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
-** BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
-** BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
-** OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
-** IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-**/
-
-#ifndef __SND_CARD_UTILS_H__
-#define __SND_CARD_UTILS_H__
-
-#include <dlfcn.h>
-
-struct snd_node {
-	void *card_node;
-	void *dev_node;
-	void *dl_hdl;
-
-	void* (*get_card) (unsigned int card);
-	void (*put_card) (void *card);
-	void* (*get_node) (void *card, unsigned int id,
-				int type);
-	int (*get_int) (void *node, const char *prop, int *val);
-	int (*get_str) (void *node, const char *prop, char **val);
-};
-
-enum {
-	NODE_PCM,
-	NODE_MIXER,
-	NODE_COMPRESS,
-};
-
-enum snd_node_type {
-	SND_NODE_TYPE_HW = 0,
-	SND_NODE_TYPE_PLUGIN,
-	SND_NODE_TYPE_INVALID,
-};
-
-struct snd_node *snd_utils_get_dev_node(unsigned int card,
-		unsigned int device, int dev_type);
-
-void snd_utils_put_dev_node(struct snd_node *node);
-
-enum snd_node_type snd_utils_get_node_type(struct snd_node *node);
-
-int snd_utils_get_int(struct snd_node *node, const char *prop, int *val);
-
-int snd_utils_get_str(struct snd_node *node, const char *prop, char **val);
-
-#endif /* end of __SND_CARD_UTILS_H__ */