Index: uspace/lib/drv/Makefile
===================================================================
--- uspace/lib/drv/Makefile	(revision 57cf3b32c4f39606c3a8d636c811ce43d8b0717c)
+++ uspace/lib/drv/Makefile	(revision c0149cc54ea29b8721df635059d2eb7364bf9936)
@@ -38,4 +38,5 @@
 	generic/logbuf.c \
 	generic/remote_audio_mixer.c \
+	generic/remote_audio_pcm_buffer.c \
 	generic/remote_hw_res.c \
 	generic/remote_char_dev.c \
Index: uspace/lib/drv/generic/dev_iface.c
===================================================================
--- uspace/lib/drv/generic/dev_iface.c	(revision 57cf3b32c4f39606c3a8d636c811ce43d8b0717c)
+++ uspace/lib/drv/generic/dev_iface.c	(revision c0149cc54ea29b8721df635059d2eb7364bf9936)
@@ -47,8 +47,10 @@
 #include "remote_pci.h"
 #include "remote_audio_mixer.h"
+#include "remote_audio_pcm_buffer.h"
 
 static const iface_dipatch_table_t remote_ifaces = {
 	.ifaces = {
 		[AUDIO_MIXER_IFACE] = &remote_audio_mixer_iface,
+		[AUDIO_PCM_BUFFER_IFACE] = &remote_audio_pcm_buffer_iface,
 		[HW_RES_DEV_IFACE] = &remote_hw_res_iface,
 		[CHAR_DEV_IFACE] = &remote_char_dev_iface,
Index: uspace/lib/drv/generic/remote_audio_pcm_buffer.c
===================================================================
--- uspace/lib/drv/generic/remote_audio_pcm_buffer.c	(revision c0149cc54ea29b8721df635059d2eb7364bf9936)
+++ uspace/lib/drv/generic/remote_audio_pcm_buffer.c	(revision c0149cc54ea29b8721df635059d2eb7364bf9936)
@@ -0,0 +1,479 @@
+/*
+ * Copyright (c) 2011 Jan Vesely
+ * 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.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR 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.
+ */
+/** @addtogroup libdrv
+ * @{
+ */
+/** @file
+ */
+
+#include <async.h>
+#include <errno.h>
+#include <assert.h>
+#include <str.h>
+#include <as.h>
+#include <sys/mman.h>
+
+#include "audio_pcm_buffer_iface.h"
+#include "ddf/driver.h"
+
+typedef enum {
+	IPC_M_AUDIO_PCM_GET_INFO_STR,
+	IPC_M_AUDIO_PCM_GET_BUFFER,
+	IPC_M_AUDIO_PCM_RELEASE_BUFFER,
+	IPC_M_AUDIO_PCM_START_PLAYBACK,
+	IPC_M_AUDIO_PCM_STOP_PLAYBACK,
+	IPC_M_AUDIO_PCM_START_RECORD,
+	IPC_M_AUDIO_PCM_STOP_RECORD,
+} audio_pcm_iface_funcs_t;
+
+/*
+ * CLIENT SIDE
+ */
+int audio_pcm_buffer_get_info_str(async_exch_t *exch, const char **name)
+{
+	if (!exch)
+		return EINVAL;
+	sysarg_t name_size;
+	const int ret = async_req_1_1(exch,
+	    DEV_IFACE_ID(AUDIO_PCM_BUFFER_IFACE),
+	    IPC_M_AUDIO_PCM_GET_INFO_STR, &name_size);
+	if (ret == EOK && name) {
+		char *name_place = calloc(1, name_size);
+		if (!name_place) {
+			/* Make the other side fail
+			 * as it waits for read request */
+			async_data_read_start(exch, (void*)-1, 0);
+			return ENOMEM;
+		}
+		const int ret =
+		    async_data_read_start(exch, name_place, name_size);
+		if (ret != EOK) {
+			free(name_place);
+			return ret;
+		}
+		*name = name_place;
+	}
+	return ret;
+}
+/*----------------------------------------------------------------------------*/
+int audio_pcm_buffer_get_buffer(async_exch_t *exch, void **buffer, size_t *size,
+    unsigned *id)
+{
+	if (!exch || !buffer || !size)
+		return EINVAL;
+	sysarg_t buffer_size, buffer_id;
+	const int ret = async_req_1_2(exch,
+	    DEV_IFACE_ID(AUDIO_PCM_BUFFER_IFACE), IPC_M_AUDIO_PCM_GET_BUFFER,
+	    &buffer_size, &buffer_id);
+	if (ret == EOK) {
+		void *dst = as_get_mappable_page(buffer_size);
+		// FIXME Should we create as_area?
+		// FIXME Do we need to know the flags?
+		const int ret =
+		    async_share_in_start_0_0(exch, dst, buffer_size);
+		if (ret != EOK) {
+			return ret;
+		}
+		*buffer = dst;
+		*size = buffer_size;
+	}
+	if (ret == EOK && id)
+		*id = buffer_id;
+	return ret;
+}
+/*----------------------------------------------------------------------------*/
+int audio_pcm_buffer_release_buffer(async_exch_t *exch, unsigned id)
+{
+	if (!exch)
+		return EINVAL;
+	return async_req_2_0(exch, DEV_IFACE_ID(AUDIO_PCM_BUFFER_IFACE),
+	    IPC_M_AUDIO_PCM_RELEASE_BUFFER, id);
+}
+/*----------------------------------------------------------------------------*/
+int audio_pcm_buffer_start_playback(async_exch_t *exch, unsigned id,
+    unsigned sample_rate, uint16_t sample_size, uint8_t channels, bool sign)
+{
+	if (!exch)
+		return EINVAL;
+	sysarg_t packed =
+	    (sample_size << 16) | (channels << 8) | (sign ? 1 : 0);
+	return async_req_4_0(exch, DEV_IFACE_ID(AUDIO_PCM_BUFFER_IFACE),
+	    IPC_M_AUDIO_PCM_START_PLAYBACK, id, sample_rate, packed);
+}
+/*----------------------------------------------------------------------------*/
+int audio_pcm_buffer_stop_playback(async_exch_t *exch, unsigned id)
+{
+	if (!exch)
+		return EINVAL;
+	return async_req_2_0(exch, DEV_IFACE_ID(AUDIO_PCM_BUFFER_IFACE),
+	    IPC_M_AUDIO_PCM_STOP_PLAYBACK, id);
+}
+/*----------------------------------------------------------------------------*/
+int audio_pcm_buffer_start_record(async_exch_t *exch, unsigned id,
+    unsigned sample_rate, unsigned sample_size, unsigned channels, bool sign)
+{
+	if (!exch || sample_size > UINT16_MAX || channels > (UINT16_MAX >> 1))
+		return EINVAL;
+	sysarg_t packed = sample_size << 16 | channels << 1 | sign ? 1 : 0;
+	return async_req_4_0(exch, DEV_IFACE_ID(AUDIO_PCM_BUFFER_IFACE),
+	    IPC_M_AUDIO_PCM_START_RECORD, id, sample_rate, packed);
+}
+/*----------------------------------------------------------------------------*/
+int audio_pcm_buffer_stop_record(async_exch_t *exch, unsigned id)
+{
+	if (!exch)
+		return EINVAL;
+	return async_req_2_0(exch, DEV_IFACE_ID(AUDIO_PCM_BUFFER_IFACE),
+	    IPC_M_AUDIO_PCM_STOP_RECORD, id);
+}
+
+/*
+ * SERVER SIDE
+ */
+static void remote_audio_pcm_get_info_str(ddf_fun_t *, void *, ipc_callid_t, ipc_call_t *);
+static void remote_audio_pcm_get_buffer(ddf_fun_t *, void *, ipc_callid_t, ipc_call_t *);
+static void remote_audio_pcm_release_buffer(ddf_fun_t *, void *, ipc_callid_t, ipc_call_t *);
+static void remote_audio_pcm_start_playback(ddf_fun_t *, void *, ipc_callid_t, ipc_call_t *);
+static void remote_audio_pcm_stop_playback(ddf_fun_t *, void *, ipc_callid_t, ipc_call_t *);
+static void remote_audio_pcm_start_record(ddf_fun_t *, void *, ipc_callid_t, ipc_call_t *);
+static void remote_audio_pcm_stop_record(ddf_fun_t *, void *, ipc_callid_t, ipc_call_t *);
+
+/** Remote audio pcm buffer interface operations. */
+static remote_iface_func_ptr_t remote_audio_pcm_iface_ops[] = {
+	[IPC_M_AUDIO_PCM_GET_INFO_STR] = remote_audio_pcm_get_info_str,
+	[IPC_M_AUDIO_PCM_GET_BUFFER] = remote_audio_pcm_get_buffer,
+	[IPC_M_AUDIO_PCM_RELEASE_BUFFER] = remote_audio_pcm_release_buffer,
+	[IPC_M_AUDIO_PCM_START_PLAYBACK] = remote_audio_pcm_start_playback,
+	[IPC_M_AUDIO_PCM_STOP_PLAYBACK] = remote_audio_pcm_stop_playback,
+	[IPC_M_AUDIO_PCM_START_RECORD] = remote_audio_pcm_start_record,
+	[IPC_M_AUDIO_PCM_STOP_RECORD] = remote_audio_pcm_stop_record,
+};
+
+/** Remote audio mixer interface structure. */
+remote_iface_t remote_audio_pcm_buffer_iface = {
+	.method_count = sizeof(remote_audio_pcm_iface_ops) /
+	    sizeof(remote_audio_pcm_iface_ops[0]),
+	.methods = remote_audio_pcm_iface_ops
+};
+/*----------------------------------------------------------------------------*/
+void remote_audio_pcm_get_info_str(ddf_fun_t *fun, void *iface,
+    ipc_callid_t callid, ipc_call_t *call)
+{
+	const audio_pcm_buffer_iface_t *pcm_iface = iface;
+
+	if (!pcm_iface->get_info_str) {
+		async_answer_0(callid, ENOTSUP);
+		return;
+	}
+	const char *name = NULL;
+	const int ret = pcm_iface->get_info_str(fun, &name);
+	const size_t name_size = name ? str_size(name) + 1 : 0;
+	async_answer_1(callid, ret, name_size);
+	/* Send the string. */
+	if (ret == EOK && name_size > 0) {
+		size_t size;
+		ipc_callid_t name_id;
+		if (!async_data_read_receive(&name_id, &size)) {
+			async_answer_0(name_id, EPARTY);
+			return;
+		}
+		if (size != name_size) {
+			async_answer_0(name_id, ELIMIT);
+			return;
+		}
+		async_data_read_finalize(name_id, name, name_size);
+	}
+}
+/*----------------------------------------------------------------------------*/
+void remote_audio_pcm_get_buffer(ddf_fun_t *fun, void *iface,
+    ipc_callid_t callid, ipc_call_t *call)
+{
+	const audio_pcm_buffer_iface_t *pcm_iface = iface;
+
+	if (!pcm_iface->get_buffer) {
+		async_answer_0(callid, ENOTSUP);
+		return;
+	}
+	void *buffer = NULL;
+	size_t size = 0;
+	unsigned id = 0;
+	const int ret = pcm_iface->get_buffer(fun, &buffer, &size, &id);
+	async_answer_2(callid, ret, size, id);
+	/* Share the buffer. */
+	if (ret == EOK && size > 0) {
+		size_t share_size;
+		ipc_callid_t name_id;
+		if (!async_share_in_receive(&name_id, &share_size)) {
+			async_answer_0(name_id, EPARTY);
+			return;
+		}
+		if (share_size != size) {
+			async_answer_0(name_id, ELIMIT);
+			return;
+		}
+		async_share_in_finalize(name_id, buffer, PROTO_READ | PROTO_WRITE);
+	}
+}
+/*----------------------------------------------------------------------------*/
+void remote_audio_pcm_release_buffer(ddf_fun_t *fun, void *iface,
+    ipc_callid_t callid, ipc_call_t *call)
+{
+	const audio_pcm_buffer_iface_t *pcm_iface = iface;
+
+	const unsigned id = DEV_IPC_GET_ARG1(*call);
+	const int ret = pcm_iface->release_buffer ?
+	    pcm_iface->release_buffer(fun, id) : ENOTSUP;
+	async_answer_0(callid, ret);
+}
+/*----------------------------------------------------------------------------*/
+void remote_audio_pcm_start_playback(ddf_fun_t *fun, void *iface,
+    ipc_callid_t callid, ipc_call_t *call)
+{
+	const audio_pcm_buffer_iface_t *pcm_iface = iface;
+
+	const unsigned id = DEV_IPC_GET_ARG1(*call);
+	const unsigned rate = DEV_IPC_GET_ARG2(*call);
+	const unsigned size = DEV_IPC_GET_ARG3(*call) >> 16;
+	const unsigned channels = (DEV_IPC_GET_ARG3(*call) >> 8) && UINT8_MAX;
+	const bool sign = (bool)(DEV_IPC_GET_ARG3(*call) & 1);
+
+	const int ret = pcm_iface->start_playback
+	    ? pcm_iface->start_playback(fun, id, rate, size, channels, sign)
+	    : ENOTSUP;
+	async_answer_0(callid, ret);
+}
+/*----------------------------------------------------------------------------*/
+void remote_audio_pcm_stop_playback(ddf_fun_t *fun, void *iface,
+    ipc_callid_t callid, ipc_call_t *call)
+{
+	const audio_pcm_buffer_iface_t *pcm_iface = iface;
+
+	const unsigned id = DEV_IPC_GET_ARG1(*call);
+	const int ret = pcm_iface->stop_playback ?
+	    pcm_iface->stop_playback(fun, id) : ENOTSUP;
+	async_answer_0(callid, ret);
+}
+/*----------------------------------------------------------------------------*/
+void remote_audio_pcm_start_record(ddf_fun_t *fun, void *iface,
+    ipc_callid_t callid, ipc_call_t *call)
+{
+	const audio_pcm_buffer_iface_t *pcm_iface = iface;
+
+	const unsigned id = DEV_IPC_GET_ARG1(*call);
+	const unsigned rate = DEV_IPC_GET_ARG2(*call);
+	const unsigned size = DEV_IPC_GET_ARG3(*call) >> 16;
+	const unsigned channels = (DEV_IPC_GET_ARG3(*call) & UINT16_MAX) >> 1;
+	const bool sign = (bool)(DEV_IPC_GET_ARG3(*call) & 1);
+
+	const int ret = pcm_iface->start_record
+	    ? pcm_iface->start_record(fun, id, rate, size, channels, sign)
+	    : ENOTSUP;
+	async_answer_0(callid, ret);
+}
+/*----------------------------------------------------------------------------*/
+void remote_audio_pcm_stop_record(ddf_fun_t *fun, void *iface,
+    ipc_callid_t callid, ipc_call_t *call)
+{
+	const audio_pcm_buffer_iface_t *pcm_iface = iface;
+
+	const unsigned id = DEV_IPC_GET_ARG1(*call);
+	const int ret = pcm_iface->stop_record ?
+	    pcm_iface->stop_record(fun, id) : ENOTSUP;
+	async_answer_0(callid, ret);
+}
+
+#if 0
+/*----------------------------------------------------------------------------*/
+void remote_audio_mixer_get_info(
+    ddf_fun_t *fun, void *iface, ipc_callid_t callid, ipc_call_t *call)
+{
+	audio_mixer_iface_t *mixer_iface = iface;
+
+	if (!mixer_iface->get_info) {
+		async_answer_0(callid, ENOTSUP);
+		return;
+	}
+	const char *name = NULL;
+	unsigned items = 0;
+	const int ret = mixer_iface->get_info(fun, &name, &items);
+	const size_t name_size = name ? str_size(name) + 1 : 0;
+	async_answer_2(callid, ret, name_size, items);
+	/* Send the name. */
+	if (ret == EOK && name_size > 0) {
+		size_t size;
+		ipc_callid_t name_id;
+		if (!async_data_read_receive(&name_id, &size)) {
+			async_answer_0(name_id, EPARTY);
+			return;
+		}
+		if (size != name_size) {
+			async_answer_0(name_id, ELIMIT);
+			return;
+		}
+		async_data_read_finalize(name_id, name, name_size);
+	}
+}
+/*----------------------------------------------------------------------------*/
+void remote_audio_mixer_get_item_info(
+    ddf_fun_t *fun, void *iface, ipc_callid_t callid, ipc_call_t *call)
+{
+	audio_mixer_iface_t *mixer_iface = iface;
+
+	if (!mixer_iface->get_item_info) {
+		async_answer_0(callid, ENOTSUP);
+		return;
+	}
+
+	const unsigned item = DEV_IPC_GET_ARG1(*call);
+	const char *name = NULL;
+	unsigned channels = 0;
+	const int ret = mixer_iface->get_item_info(fun, item, &name, &channels);
+	const size_t name_size = name ? str_size(name) + 1 : 0;
+	async_answer_2(callid, ret, name_size, channels);
+	/* Send the name. */
+	if (ret == EOK && name_size > 0) {
+		size_t size;
+		ipc_callid_t name_id;
+		if (!async_data_read_receive(&name_id, &size)) {
+			async_answer_0(name_id, EPARTY);
+			return;
+		}
+		if (size != name_size) {
+			async_answer_0(name_id, ELIMIT);
+			return;
+		}
+		async_data_read_finalize(name_id, name, name_size);
+	}
+}
+/*----------------------------------------------------------------------------*/
+void remote_audio_mixer_get_channel_info(
+    ddf_fun_t *fun, void *iface, ipc_callid_t callid, ipc_call_t *call)
+{
+	audio_mixer_iface_t *mixer_iface = iface;
+
+	if (!mixer_iface->get_channel_info) {
+		async_answer_0(callid, ENOTSUP);
+		return;
+	}
+
+	const unsigned item = DEV_IPC_GET_ARG1(*call);
+	const unsigned channel = DEV_IPC_GET_ARG2(*call);
+	const char *name = NULL;
+	unsigned levels = 0;
+	const int ret =
+	    mixer_iface->get_channel_info(fun, item, channel, &name, &levels);
+	const size_t name_size = name ? str_size(name) + 1 : 0;
+	async_answer_2(callid, ret, name_size, levels);
+	/* Send the name. */
+	if (ret == EOK && name_size > 0) {
+		size_t size;
+		ipc_callid_t name_id;
+		if (!async_data_read_receive(&name_id, &size)) {
+			async_answer_0(name_id, EPARTY);
+			return;
+		}
+		if (size != name_size) {
+			async_answer_0(name_id, ELIMIT);
+			return;
+		}
+		async_data_read_finalize(name_id, name, name_size);
+	}
+}
+/*----------------------------------------------------------------------------*/
+void remote_audio_mixer_channel_mute_set(
+    ddf_fun_t *fun, void *iface, ipc_callid_t callid, ipc_call_t *call)
+{
+	audio_mixer_iface_t *mixer_iface = iface;
+
+	if (!mixer_iface->channel_mute_set) {
+		async_answer_0(callid, ENOTSUP);
+		return;
+	}
+	const unsigned item = DEV_IPC_GET_ARG1(*call);
+	const unsigned channel = DEV_IPC_GET_ARG2(*call);
+	const bool mute = DEV_IPC_GET_ARG3(*call);
+	const int ret = mixer_iface->channel_mute_set(fun, item, channel, mute);
+	async_answer_0(callid, ret);
+}
+/*----------------------------------------------------------------------------*/
+void remote_audio_mixer_channel_mute_get(
+    ddf_fun_t *fun, void *iface, ipc_callid_t callid, ipc_call_t *call)
+{
+	audio_mixer_iface_t *mixer_iface = iface;
+
+	if (!mixer_iface->channel_mute_get) {
+		async_answer_0(callid, ENOTSUP);
+		return;
+	}
+	const unsigned item = DEV_IPC_GET_ARG1(*call);
+	const unsigned channel = DEV_IPC_GET_ARG2(*call);
+	bool mute = false;
+	const int ret =
+	    mixer_iface->channel_mute_get(fun, item, channel, &mute);
+	async_answer_1(callid, ret, mute);
+}
+/*----------------------------------------------------------------------------*/
+void remote_audio_mixer_channel_volume_set(
+    ddf_fun_t *fun, void *iface, ipc_callid_t callid, ipc_call_t *call)
+{
+	audio_mixer_iface_t *mixer_iface = iface;
+
+	if (!mixer_iface->channel_volume_set) {
+		async_answer_0(callid, ENOTSUP);
+		return;
+	}
+	const unsigned item = DEV_IPC_GET_ARG1(*call);
+	const unsigned channel = DEV_IPC_GET_ARG2(*call);
+	const unsigned level = DEV_IPC_GET_ARG3(*call);
+	const int ret =
+	    mixer_iface->channel_volume_set(fun, item, channel, level);
+	async_answer_0(callid, ret);
+}
+/*----------------------------------------------------------------------------*/
+void remote_audio_mixer_channel_volume_get(
+    ddf_fun_t *fun, void *iface, ipc_callid_t callid, ipc_call_t *call)
+{
+	audio_mixer_iface_t *mixer_iface = iface;
+
+	if (!mixer_iface->channel_volume_get) {
+		async_answer_0(callid, ENOTSUP);
+		return;
+	}
+	const unsigned item = DEV_IPC_GET_ARG1(*call);
+	const unsigned channel = DEV_IPC_GET_ARG2(*call);
+	unsigned current = 0, max = 0;
+	const int ret =
+	    mixer_iface->channel_volume_get(fun, item, channel, &current, &max);
+	async_answer_2(callid, ret, current, max);
+}
+#endif
+
+/**
+ * @}
+ */
+
Index: uspace/lib/drv/include/audio_pcm_buffer_iface.h
===================================================================
--- uspace/lib/drv/include/audio_pcm_buffer_iface.h	(revision c0149cc54ea29b8721df635059d2eb7364bf9936)
+++ uspace/lib/drv/include/audio_pcm_buffer_iface.h	(revision c0149cc54ea29b8721df635059d2eb7364bf9936)
@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2011 Jan Vesely
+ * 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.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR 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.
+ */
+/** @addtogroup libdrv
+ * @addtogroup usb
+ * @{
+ */
+/** @file
+ * @brief Audio PCM buffer interface.
+ */
+
+#ifndef LIBDRV_AUDIO_PCM_BUFFER_IFACE_H_
+#define LIBDRV_AUDIO_PCM_BUFFER_IFACE_H_
+
+#include <async.h>
+#include <bool.h>
+
+#include "ddf/driver.h"
+
+int audio_pcm_buffer_get_info_str(async_exch_t *, const char **);
+int audio_pcm_buffer_get_buffer(async_exch_t *, void **, size_t *, unsigned *);
+int audio_pcm_buffer_release_buffer(async_exch_t *, unsigned);
+
+int audio_pcm_buffer_start_playback(async_exch_t *, unsigned,
+    unsigned, uint16_t, uint8_t, bool);
+int audio_pcm_buffer_stop_playback(async_exch_t *, unsigned);
+
+int audio_pcm_buffer_start_record(async_exch_t *, unsigned,
+    unsigned, unsigned, unsigned, bool);
+int audio_pcm_buffer_stop_record(async_exch_t *, unsigned);
+
+/** Audio pcm communication interface. */
+typedef struct {
+	int (*get_info_str)(ddf_fun_t *, const char **);
+	int (*get_buffer)(ddf_fun_t *, void **, size_t *, unsigned *);
+	int (*release_buffer)(ddf_fun_t *, unsigned);
+	int (*start_playback)(ddf_fun_t *, unsigned,
+	    unsigned, unsigned, unsigned, bool);
+	int (*stop_playback)(ddf_fun_t *, unsigned);
+	int (*start_record)(ddf_fun_t *, unsigned,
+	    unsigned, unsigned, unsigned, bool);
+	int (*stop_record)(ddf_fun_t *, unsigned);
+} audio_pcm_buffer_iface_t;
+
+#endif
+/**
+ * @}
+ */
Index: uspace/lib/drv/include/remote_audio_pcm_buffer.h
===================================================================
--- uspace/lib/drv/include/remote_audio_pcm_buffer.h	(revision c0149cc54ea29b8721df635059d2eb7364bf9936)
+++ uspace/lib/drv/include/remote_audio_pcm_buffer.h	(revision c0149cc54ea29b8721df635059d2eb7364bf9936)
@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2011 Jan Vesely
+ * 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.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR 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.
+ */
+/** @addtogroup libdrv
+ * @{
+ */
+/** @file
+ */
+
+#ifndef LIBDRV_REMOTE_AUDIO_PCM_H_
+#define LIBDRV_REMOTE_AUDIO_PCM_H_
+
+extern remote_iface_t remote_audio_pcm_buffer_iface;
+
+#endif
+
+/**
+ * @}
+ */
+
