[v3,1/4] A2DP api with multi-codec support

Submitted by Huang-Huang Bao on Dec. 29, 2018, 3:48 p.m.

Details

Message ID 20181229154808.17235-2-eh5@sokka.cn
State New
Series "bluetooth: Adds A2DP AAC, aptX(HD), LDAC codecs"
Headers show

Commit Message

Huang-Huang Bao Dec. 29, 2018, 3:48 p.m.
Update "a2dp-codecs.h" from bluez

Separate A2DP processes from bluez5-util, module-bluez5-device.

Add prop "bluetooth.a2dp_codec" to pulseaudio sink/source properties.
---
 src/Makefile.am                               |  15 +-
 src/modules/bluetooth/a2dp-codecs.h           | 115 ---
 src/modules/bluetooth/a2dp/a2dp-api.h         | 189 +++++
 src/modules/bluetooth/a2dp/a2dp-codecs.h      | 453 ++++++++++++
 src/modules/bluetooth/a2dp/a2dp_sbc.c         | 679 ++++++++++++++++++
 src/modules/bluetooth/a2dp/a2dp_util.c        | 316 ++++++++
 src/modules/bluetooth/{ => a2dp}/rtp.h        |   0
 src/modules/bluetooth/bluez5-util.c           | 308 +++-----
 src/modules/bluetooth/bluez5-util.h           |   7 +
 src/modules/bluetooth/module-bluez5-device.c  | 461 ++++--------
 .../bluetooth/module-bluez5-discover.c        |  15 +-
 11 files changed, 1920 insertions(+), 638 deletions(-)
 delete mode 100644 src/modules/bluetooth/a2dp-codecs.h
 create mode 100644 src/modules/bluetooth/a2dp/a2dp-api.h
 create mode 100644 src/modules/bluetooth/a2dp/a2dp-codecs.h
 create mode 100644 src/modules/bluetooth/a2dp/a2dp_sbc.c
 create mode 100644 src/modules/bluetooth/a2dp/a2dp_util.c
 rename src/modules/bluetooth/{ => a2dp}/rtp.h (100%)

Patch hide | download patch | download mbox

diff --git a/src/Makefile.am b/src/Makefile.am
index 2dbb4563b..521b9b684 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -2123,8 +2123,11 @@  module_bluetooth_discover_la_CFLAGS = $(AM_CFLAGS) -DPA_MODULE_NAME=module_bluet
 libbluez5_util_la_SOURCES = \
 		modules/bluetooth/bluez5-util.c \
 		modules/bluetooth/bluez5-util.h \
-		modules/bluetooth/a2dp-codecs.h \
-		modules/bluetooth/rtp.h
+		modules/bluetooth/a2dp/a2dp_util.c \
+		modules/bluetooth/a2dp/a2dp_sbc.c \
+		modules/bluetooth/a2dp/a2dp-api.h \
+		modules/bluetooth/a2dp/a2dp-codecs.h \
+		modules/bluetooth/a2dp/rtp.h
 if HAVE_BLUEZ_5_OFONO_HEADSET
 libbluez5_util_la_SOURCES += \
 		modules/bluetooth/backend-ofono.c
@@ -2135,8 +2138,8 @@  libbluez5_util_la_SOURCES += \
 endif
 
 libbluez5_util_la_LDFLAGS = -avoid-version
-libbluez5_util_la_LIBADD = $(MODULE_LIBADD) $(DBUS_LIBS)
-libbluez5_util_la_CFLAGS = $(AM_CFLAGS) $(DBUS_CFLAGS)
+libbluez5_util_la_LIBADD = $(MODULE_LIBADD) $(DBUS_LIBS) $(SBC_LIBS)
+libbluez5_util_la_CFLAGS = $(AM_CFLAGS) $(DBUS_CFLAGS) $(SBC_CFLAGS)
 
 module_bluez5_discover_la_SOURCES = modules/bluetooth/module-bluez5-discover.c
 module_bluez5_discover_la_LDFLAGS = $(MODULE_LDFLAGS)
@@ -2145,8 +2148,8 @@  module_bluez5_discover_la_CFLAGS = $(AM_CFLAGS) $(DBUS_CFLAGS) -DPA_MODULE_NAME=
 
 module_bluez5_device_la_SOURCES = modules/bluetooth/module-bluez5-device.c
 module_bluez5_device_la_LDFLAGS = $(MODULE_LDFLAGS)
-module_bluez5_device_la_LIBADD = $(MODULE_LIBADD) $(SBC_LIBS) libbluez5-util.la
-module_bluez5_device_la_CFLAGS = $(AM_CFLAGS) $(SBC_CFLAGS) -DPA_MODULE_NAME=module_bluez5_device
+module_bluez5_device_la_LIBADD = $(MODULE_LIBADD) libbluez5-util.la
+module_bluez5_device_la_CFLAGS = $(AM_CFLAGS) -DPA_MODULE_NAME=module_bluez5_device
 
 # Apple Airtunes/RAOP
 module_raop_sink_la_SOURCES = modules/raop/module-raop-sink.c
diff --git a/src/modules/bluetooth/a2dp-codecs.h b/src/modules/bluetooth/a2dp-codecs.h
deleted file mode 100644
index 8afcfcb24..000000000
--- a/src/modules/bluetooth/a2dp-codecs.h
+++ /dev/null
@@ -1,115 +0,0 @@ 
-/*
- *
- *  BlueZ - Bluetooth protocol stack for Linux
- *
- *  Copyright (C) 2006-2010  Nokia Corporation
- *  Copyright (C) 2004-2010  Marcel Holtmann <marcel@holtmann.org>
- *
- *
- *  This library is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU Lesser General Public
- *  License as published by the Free Software Foundation; either
- *  version 2.1 of the License, or (at your option) any later version.
- *
- *  This library is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- *  Lesser General Public License for more details.
- *
- *  You should have received a copy of the GNU Lesser General Public
- *  License along with this library; if not, see <http://www.gnu.org/licenses/>.
- *
- */
-
-#define A2DP_CODEC_SBC			0x00
-#define A2DP_CODEC_MPEG12		0x01
-#define A2DP_CODEC_MPEG24		0x02
-#define A2DP_CODEC_ATRAC		0x03
-
-#define SBC_SAMPLING_FREQ_16000		(1 << 3)
-#define SBC_SAMPLING_FREQ_32000		(1 << 2)
-#define SBC_SAMPLING_FREQ_44100		(1 << 1)
-#define SBC_SAMPLING_FREQ_48000		1
-
-#define SBC_CHANNEL_MODE_MONO		(1 << 3)
-#define SBC_CHANNEL_MODE_DUAL_CHANNEL	(1 << 2)
-#define SBC_CHANNEL_MODE_STEREO		(1 << 1)
-#define SBC_CHANNEL_MODE_JOINT_STEREO	1
-
-#define SBC_BLOCK_LENGTH_4		(1 << 3)
-#define SBC_BLOCK_LENGTH_8		(1 << 2)
-#define SBC_BLOCK_LENGTH_12		(1 << 1)
-#define SBC_BLOCK_LENGTH_16		1
-
-#define SBC_SUBBANDS_4			(1 << 1)
-#define SBC_SUBBANDS_8			1
-
-#define SBC_ALLOCATION_SNR		(1 << 1)
-#define SBC_ALLOCATION_LOUDNESS		1
-
-#define MPEG_CHANNEL_MODE_MONO		(1 << 3)
-#define MPEG_CHANNEL_MODE_DUAL_CHANNEL	(1 << 2)
-#define MPEG_CHANNEL_MODE_STEREO	(1 << 1)
-#define MPEG_CHANNEL_MODE_JOINT_STEREO	1
-
-#define MPEG_LAYER_MP1			(1 << 2)
-#define MPEG_LAYER_MP2			(1 << 1)
-#define MPEG_LAYER_MP3			1
-
-#define MPEG_SAMPLING_FREQ_16000	(1 << 5)
-#define MPEG_SAMPLING_FREQ_22050	(1 << 4)
-#define MPEG_SAMPLING_FREQ_24000	(1 << 3)
-#define MPEG_SAMPLING_FREQ_32000	(1 << 2)
-#define MPEG_SAMPLING_FREQ_44100	(1 << 1)
-#define MPEG_SAMPLING_FREQ_48000	1
-
-#define MAX_BITPOOL 64
-#define MIN_BITPOOL 2
-
-#if __BYTE_ORDER == __LITTLE_ENDIAN
-
-typedef struct {
-	uint8_t channel_mode:4;
-	uint8_t frequency:4;
-	uint8_t allocation_method:2;
-	uint8_t subbands:2;
-	uint8_t block_length:4;
-	uint8_t min_bitpool;
-	uint8_t max_bitpool;
-} __attribute__ ((packed)) a2dp_sbc_t;
-
-typedef struct {
-	uint8_t channel_mode:4;
-	uint8_t crc:1;
-	uint8_t layer:3;
-	uint8_t frequency:6;
-	uint8_t mpf:1;
-	uint8_t rfa:1;
-	uint16_t bitrate;
-} __attribute__ ((packed)) a2dp_mpeg_t;
-
-#elif __BYTE_ORDER == __BIG_ENDIAN
-
-typedef struct {
-	uint8_t frequency:4;
-	uint8_t channel_mode:4;
-	uint8_t block_length:4;
-	uint8_t subbands:2;
-	uint8_t allocation_method:2;
-	uint8_t min_bitpool;
-	uint8_t max_bitpool;
-} __attribute__ ((packed)) a2dp_sbc_t;
-
-typedef struct {
-	uint8_t layer:3;
-	uint8_t crc:1;
-	uint8_t channel_mode:4;
-	uint8_t rfa:1;
-	uint8_t mpf:1;
-	uint8_t frequency:6;
-	uint16_t bitrate;
-} __attribute__ ((packed)) a2dp_mpeg_t;
-
-#else
-#error "Unknown byte order"
-#endif
diff --git a/src/modules/bluetooth/a2dp/a2dp-api.h b/src/modules/bluetooth/a2dp/a2dp-api.h
new file mode 100644
index 000000000..1492d29fd
--- /dev/null
+++ b/src/modules/bluetooth/a2dp/a2dp-api.h
@@ -0,0 +1,189 @@ 
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2018 Huang-Huang Bao
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as
+  published by the Free Software Foundation; either version 2.1 of the
+  License, or (at your option) any later version.
+
+  PulseAudio is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
+***/
+
+#ifndef fooa2dpcodecapifoo
+#define fooa2dpcodecapifoo
+
+#ifdef HAVE_CONFIG_H
+
+#include <config.h>
+
+#endif
+
+#include <pulse/sample.h>
+#include <pulse/proplist.h>
+#include <pulsecore/hashmap.h>
+
+#include "a2dp-codecs.h"
+#include "rtp.h"
+
+typedef struct pa_a2dp_codec pa_a2dp_codec_t;
+typedef struct pa_a2dp_config pa_a2dp_config_t;
+
+extern const pa_a2dp_codec_t pa_a2dp_sbc;
+
+
+/* Run from <pa_a2dp_sink_t>.encode */
+
+typedef void (*pa_a2dp_source_read_cb_t)(const void **read_buf, size_t read_buf_size, void *data);
+
+typedef void (*pa_a2dp_source_read_buf_free_cb_t)(const void **read_buf, void *data);
+
+
+// Larger index stands for higher priority by default
+typedef enum pa_a2dp_codec_index {
+    PA_A2DP_SINK_MIN,
+    PA_A2DP_SINK_SBC,
+    PA_A2DP_SINK_MAX,
+    PA_A2DP_SOURCE_MIN = PA_A2DP_SINK_MAX,
+    PA_A2DP_SOURCE_SBC,
+    PA_A2DP_SOURCE_MAX,
+    PA_A2DP_CODEC_INDEX_UNAVAILABLE
+} pa_a2dp_codec_index_t;
+
+typedef struct pa_a2dp_sink {
+    int priority;
+
+    /* Load decoder if it's not loaded; Return true if it's loaded */
+    bool (*decoder_load)();
+
+    /* Memory management is pa_a2dp_sink's work */
+    bool (*init)(void **codec_data);
+
+    /* Optional. Update user configurations
+     * Note: not transport 'configuration' or 'capabilities' */
+    int (*update_user_config)(pa_proplist *user_config, void **codec_data);
+
+    void (*config_transport)(pa_sample_spec default_sample_spec, const void *configuration, size_t configuration_size,
+                             pa_sample_spec *sample_spec, void **codec_data);
+
+    void (*get_block_size)(size_t read_link_mtu, size_t *read_block_size, void **codec_data);
+
+    void (*setup_stream)(void **codec_data);
+
+    size_t
+    (*decode)(const void *read_buf, size_t read_buf_size, void *write_buf, size_t write_buf_size, size_t *decoded,
+              uint32_t *timestamp, void **codec_data);
+
+    void (*free)(void **codec_data);
+} pa_a2dp_sink_t;
+
+
+typedef struct pa_a2dp_source {
+    int priority;
+
+    /* Load encoder if it's not loaded; Return true if it's loaded */
+    bool (*encoder_load)();
+
+    /* Memory management is pa_a2dp_source's work */
+    bool (*init)(pa_a2dp_source_read_cb_t read_cb, pa_a2dp_source_read_buf_free_cb_t free_cb, void **codec_data);
+
+    /* Optional. Update user configurations
+     * Note: not transport 'configuration' or 'capabilities' */
+    int (*update_user_config)(pa_proplist *user_config, void **codec_data);
+
+    void (*config_transport)(pa_sample_spec default_sample_spec, const void *configuration, size_t configuration_size,
+                             pa_sample_spec *sample_spec, void **codec_data);
+
+    void (*get_block_size)(size_t write_link_mtu, size_t *write_block_size, void **codec_data);
+
+    void (*setup_stream)(void **codec_data);
+
+    /* The implement should pass read_cb_data to pa_a2dp_source_read_cb, pa_a2dp_source_read_buf_free_cb */
+    size_t (*encode)(uint32_t timestamp, void *write_buf, size_t write_buf_size, size_t *encoded,
+                     void *read_cb_data, void **codec_data);
+
+    /* Optional */
+    void (*set_tx_length)(size_t len, void **codec_data);
+
+    /* Optional */
+    void (*decrease_quality)(void **codec_data);
+
+    void (*free)(void **codec_data);
+} pa_a2dp_source_t;
+
+
+struct pa_a2dp_codec {
+    const char *name;
+    uint8_t codec;
+    const a2dp_vendor_codec_t *vendor_codec;
+    pa_a2dp_sink_t *a2dp_sink;
+    pa_a2dp_source_t *a2dp_source;
+
+    /* Memory management is pa_a2dp_codec's work */
+    size_t (*get_capabilities)(void **capabilities);
+
+    void (*free_capabilities)(void **capabilities);
+
+    size_t (*select_configuration)(const pa_sample_spec default_sample_spec, const uint8_t *supported_capabilities,
+                                   const size_t capabilities_size, void **configuration);
+
+    void (*free_configuration)(void **configuration);
+
+    /* Return true if configuration valid */
+    bool (*validate_configuration)(const uint8_t *selected_configuration, const size_t configuration_size);
+
+};
+
+
+typedef struct pa_a2dp_freq_cap {
+    uint32_t rate;
+    uint32_t cap;
+} pa_a2dp_freq_cap_t;
+
+
+/* Utils */
+
+bool pa_a2dp_select_cap_frequency(uint32_t freq_cap, pa_sample_spec default_sample_spec,
+                                  const pa_a2dp_freq_cap_t *freq_cap_table,
+                                  size_t n, pa_a2dp_freq_cap_t *result);
+
+void pa_a2dp_init(pa_a2dp_config_t **a2dp_config);
+
+void pa_a2dp_set_max_priority(pa_a2dp_codec_index_t codec_index, pa_a2dp_config_t **a2dp_config);
+
+void pa_a2dp_set_disable(pa_a2dp_codec_index_t codec_index, pa_a2dp_config_t **a2dp_config);
+
+void pa_a2dp_free(pa_a2dp_config_t **a2dp_config);
+
+
+void pa_a2dp_get_sink_indices(pa_hashmap **sink_indices, pa_a2dp_config_t **a2dp_config);
+
+void pa_a2dp_get_source_indices(pa_hashmap **source_indices, pa_a2dp_config_t **a2dp_config);
+
+void pa_a2dp_get_ordered_indices(pa_hashmap **ordered_indices, pa_a2dp_config_t **a2dp_config);
+
+
+void pa_a2dp_codec_index_to_endpoint(pa_a2dp_codec_index_t codec_index, const char **endpoint);
+
+void pa_a2dp_endpoint_to_codec_index(const char *endpoint, pa_a2dp_codec_index_t *codec_index);
+
+void pa_a2dp_codec_index_to_a2dp_codec(pa_a2dp_codec_index_t codec_index, const pa_a2dp_codec_t **a2dp_codec);
+
+void
+pa_a2dp_a2dp_codec_to_codec_index(const pa_a2dp_codec_t *a2dp_codec, bool is_sink, pa_a2dp_codec_index_t *codec_index);
+
+void pa_a2dp_get_a2dp_codec(uint8_t codec, const a2dp_vendor_codec_t *vendor_codec, const pa_a2dp_codec_t **a2dp_codec);
+
+bool pa_a2dp_codec_index_is_sink(pa_a2dp_codec_index_t codec_index);
+
+bool pa_a2dp_codec_index_is_source(pa_a2dp_codec_index_t codec_index);
+
+
+#endif
diff --git a/src/modules/bluetooth/a2dp/a2dp-codecs.h b/src/modules/bluetooth/a2dp/a2dp-codecs.h
new file mode 100644
index 000000000..0bdd29110
--- /dev/null
+++ b/src/modules/bluetooth/a2dp/a2dp-codecs.h
@@ -0,0 +1,453 @@ 
+/*
+ *
+ *  BlueZ - Bluetooth protocol stack for Linux
+ *
+ *  Copyright (C) 2006-2010  Nokia Corporation
+ *  Copyright (C) 2004-2010  Marcel Holtmann <marcel@holtmann.org>
+ *  Copyright (C) 2018       Pali Rohár <pali.rohar@gmail.com>
+ *
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#include <endian.h>
+#include <stdint.h>
+
+#define A2DP_CODEC_SBC			0x00
+#define A2DP_CODEC_MPEG12		0x01
+#define A2DP_CODEC_MPEG24		0x02
+#define A2DP_CODEC_ATRAC		0x04
+#define A2DP_CODEC_VENDOR		0xFF
+
+#define SBC_SAMPLING_FREQ_16000		(1 << 3)
+#define SBC_SAMPLING_FREQ_32000		(1 << 2)
+#define SBC_SAMPLING_FREQ_44100		(1 << 1)
+#define SBC_SAMPLING_FREQ_48000		1
+
+#define SBC_CHANNEL_MODE_MONO		(1 << 3)
+#define SBC_CHANNEL_MODE_DUAL_CHANNEL	(1 << 2)
+#define SBC_CHANNEL_MODE_STEREO		(1 << 1)
+#define SBC_CHANNEL_MODE_JOINT_STEREO	1
+
+#define SBC_BLOCK_LENGTH_4		(1 << 3)
+#define SBC_BLOCK_LENGTH_8		(1 << 2)
+#define SBC_BLOCK_LENGTH_12		(1 << 1)
+#define SBC_BLOCK_LENGTH_16		1
+
+#define SBC_SUBBANDS_4			(1 << 1)
+#define SBC_SUBBANDS_8			1
+
+#define SBC_ALLOCATION_SNR		(1 << 1)
+#define SBC_ALLOCATION_LOUDNESS		1
+
+#define SBC_MAX_BITPOOL			64
+#define SBC_MIN_BITPOOL			2
+
+#define MPEG_CHANNEL_MODE_MONO		(1 << 3)
+#define MPEG_CHANNEL_MODE_DUAL_CHANNEL	(1 << 2)
+#define MPEG_CHANNEL_MODE_STEREO	(1 << 1)
+#define MPEG_CHANNEL_MODE_JOINT_STEREO	1
+
+#define MPEG_LAYER_MP1			(1 << 2)
+#define MPEG_LAYER_MP2			(1 << 1)
+#define MPEG_LAYER_MP3			1
+
+#define MPEG_SAMPLING_FREQ_16000	(1 << 5)
+#define MPEG_SAMPLING_FREQ_22050	(1 << 4)
+#define MPEG_SAMPLING_FREQ_24000	(1 << 3)
+#define MPEG_SAMPLING_FREQ_32000	(1 << 2)
+#define MPEG_SAMPLING_FREQ_44100	(1 << 1)
+#define MPEG_SAMPLING_FREQ_48000	1
+
+#define MPEG_BIT_RATE_INDEX_0		(1 << 0)
+#define MPEG_BIT_RATE_INDEX_1		(1 << 1)
+#define MPEG_BIT_RATE_INDEX_2		(1 << 2)
+#define MPEG_BIT_RATE_INDEX_3		(1 << 3)
+#define MPEG_BIT_RATE_INDEX_4		(1 << 4)
+#define MPEG_BIT_RATE_INDEX_5		(1 << 5)
+#define MPEG_BIT_RATE_INDEX_6		(1 << 6)
+#define MPEG_BIT_RATE_INDEX_7		(1 << 7)
+#define MPEG_BIT_RATE_INDEX_8		(1 << 8)
+#define MPEG_BIT_RATE_INDEX_9		(1 << 9)
+#define MPEG_BIT_RATE_INDEX_10		(1 << 10)
+#define MPEG_BIT_RATE_INDEX_11		(1 << 11)
+#define MPEG_BIT_RATE_INDEX_12		(1 << 12)
+#define MPEG_BIT_RATE_INDEX_13		(1 << 13)
+#define MPEG_BIT_RATE_INDEX_14		(1 << 14)
+
+#define MPEG_MP1_BIT_RATE_32000		MPEG_BIT_RATE_INDEX_1
+#define MPEG_MP1_BIT_RATE_64000		MPEG_BIT_RATE_INDEX_2
+#define MPEG_MP1_BIT_RATE_96000		MPEG_BIT_RATE_INDEX_3
+#define MPEG_MP1_BIT_RATE_128000	MPEG_BIT_RATE_INDEX_4
+#define MPEG_MP1_BIT_RATE_160000	MPEG_BIT_RATE_INDEX_5
+#define MPEG_MP1_BIT_RATE_192000	MPEG_BIT_RATE_INDEX_6
+#define MPEG_MP1_BIT_RATE_224000	MPEG_BIT_RATE_INDEX_7
+#define MPEG_MP1_BIT_RATE_256000	MPEG_BIT_RATE_INDEX_8
+#define MPEG_MP1_BIT_RATE_288000	MPEG_BIT_RATE_INDEX_9
+#define MPEG_MP1_BIT_RATE_320000	MPEG_BIT_RATE_INDEX_10
+#define MPEG_MP1_BIT_RATE_352000	MPEG_BIT_RATE_INDEX_11
+#define MPEG_MP1_BIT_RATE_384000	MPEG_BIT_RATE_INDEX_12
+#define MPEG_MP1_BIT_RATE_416000	MPEG_BIT_RATE_INDEX_13
+#define MPEG_MP1_BIT_RATE_448000	MPEG_BIT_RATE_INDEX_14
+
+#define MPEG_MP2_BIT_RATE_32000		MPEG_BIT_RATE_INDEX_1
+#define MPEG_MP2_BIT_RATE_48000		MPEG_BIT_RATE_INDEX_2
+#define MPEG_MP2_BIT_RATE_56000		MPEG_BIT_RATE_INDEX_3
+#define MPEG_MP2_BIT_RATE_64000		MPEG_BIT_RATE_INDEX_4
+#define MPEG_MP2_BIT_RATE_80000		MPEG_BIT_RATE_INDEX_5
+#define MPEG_MP2_BIT_RATE_96000		MPEG_BIT_RATE_INDEX_6
+#define MPEG_MP2_BIT_RATE_112000	MPEG_BIT_RATE_INDEX_7
+#define MPEG_MP2_BIT_RATE_128000	MPEG_BIT_RATE_INDEX_8
+#define MPEG_MP2_BIT_RATE_160000	MPEG_BIT_RATE_INDEX_9
+#define MPEG_MP2_BIT_RATE_192000	MPEG_BIT_RATE_INDEX_10
+#define MPEG_MP2_BIT_RATE_224000	MPEG_BIT_RATE_INDEX_11
+#define MPEG_MP2_BIT_RATE_256000	MPEG_BIT_RATE_INDEX_12
+#define MPEG_MP2_BIT_RATE_320000	MPEG_BIT_RATE_INDEX_13
+#define MPEG_MP2_BIT_RATE_384000	MPEG_BIT_RATE_INDEX_14
+
+#define MPEG_MP3_BIT_RATE_32000		MPEG_BIT_RATE_INDEX_1
+#define MPEG_MP3_BIT_RATE_40000		MPEG_BIT_RATE_INDEX_2
+#define MPEG_MP3_BIT_RATE_48000		MPEG_BIT_RATE_INDEX_3
+#define MPEG_MP3_BIT_RATE_56000		MPEG_BIT_RATE_INDEX_4
+#define MPEG_MP3_BIT_RATE_64000		MPEG_BIT_RATE_INDEX_5
+#define MPEG_MP3_BIT_RATE_80000		MPEG_BIT_RATE_INDEX_6
+#define MPEG_MP3_BIT_RATE_96000		MPEG_BIT_RATE_INDEX_7
+#define MPEG_MP3_BIT_RATE_112000	MPEG_BIT_RATE_INDEX_8
+#define MPEG_MP3_BIT_RATE_128000	MPEG_BIT_RATE_INDEX_9
+#define MPEG_MP3_BIT_RATE_160000	MPEG_BIT_RATE_INDEX_10
+#define MPEG_MP3_BIT_RATE_192000	MPEG_BIT_RATE_INDEX_11
+#define MPEG_MP3_BIT_RATE_224000	MPEG_BIT_RATE_INDEX_12
+#define MPEG_MP3_BIT_RATE_256000	MPEG_BIT_RATE_INDEX_13
+#define MPEG_MP3_BIT_RATE_320000	MPEG_BIT_RATE_INDEX_14
+
+#define MPEG_BIT_RATE_FREE		MPEG_BIT_RATE_INDEX_0
+
+#define MPEG_GET_BITRATE(a) ((uint16_t)(a).bitrate1 << 8 | (a).bitrate2)
+#define MPEG_SET_BITRATE(a, b) \
+	do { \
+		(a).bitrate1 = ((b) >> 8) & 0x7f; \
+		(a).bitrate2 = (b) & 0xff; \
+	} while (0)
+
+#define AAC_OBJECT_TYPE_MPEG2_AAC_LC	0x80
+#define AAC_OBJECT_TYPE_MPEG4_AAC_LC	0x40
+#define AAC_OBJECT_TYPE_MPEG4_AAC_LTP	0x20
+#define AAC_OBJECT_TYPE_MPEG4_AAC_SCA	0x10
+
+#define AAC_SAMPLING_FREQ_8000		0x0800
+#define AAC_SAMPLING_FREQ_11025		0x0400
+#define AAC_SAMPLING_FREQ_12000		0x0200
+#define AAC_SAMPLING_FREQ_16000		0x0100
+#define AAC_SAMPLING_FREQ_22050		0x0080
+#define AAC_SAMPLING_FREQ_24000		0x0040
+#define AAC_SAMPLING_FREQ_32000		0x0020
+#define AAC_SAMPLING_FREQ_44100		0x0010
+#define AAC_SAMPLING_FREQ_48000		0x0008
+#define AAC_SAMPLING_FREQ_64000		0x0004
+#define AAC_SAMPLING_FREQ_88200		0x0002
+#define AAC_SAMPLING_FREQ_96000		0x0001
+
+#define AAC_CHANNELS_1			0x02
+#define AAC_CHANNELS_2			0x01
+
+#define AAC_GET_BITRATE(a) ((a).bitrate1 << 16 | \
+					(a).bitrate2 << 8 | (a).bitrate3)
+#define AAC_GET_FREQUENCY(a) ((a).frequency1 << 4 | (a).frequency2)
+
+#define AAC_SET_BITRATE(a, b) \
+	do { \
+		(a).bitrate1 = (b >> 16) & 0x7f; \
+		(a).bitrate2 = (b >> 8) & 0xff; \
+		(a).bitrate3 = b & 0xff; \
+	} while (0)
+#define AAC_SET_FREQUENCY(a, f) \
+	do { \
+		(a).frequency1 = (f >> 4) & 0xff; \
+		(a).frequency2 = f & 0x0f; \
+	} while (0)
+
+#define AAC_INIT_BITRATE(b) \
+	.bitrate1 = (b >> 16) & 0x7f, \
+	.bitrate2 = (b >> 8) & 0xff, \
+	.bitrate3 = b & 0xff,
+#define AAC_INIT_FREQUENCY(f) \
+	.frequency1 = (f >> 4) & 0xff, \
+	.frequency2 = f & 0x0f,
+
+#define APTX_VENDOR_ID			0x0000004f
+#define APTX_CODEC_ID			0x0001
+
+#define APTX_CHANNEL_MODE_MONO		0x01
+#define APTX_CHANNEL_MODE_STEREO	0x02
+
+#define APTX_SAMPLING_FREQ_16000	0x08
+#define APTX_SAMPLING_FREQ_32000	0x04
+#define APTX_SAMPLING_FREQ_44100	0x02
+#define APTX_SAMPLING_FREQ_48000	0x01
+
+#define FASTSTREAM_VENDOR_ID		0x0000000a
+#define FASTSTREAM_CODEC_ID		0x0001
+
+#define FASTSTREAM_DIRECTION_SINK	0x1
+#define FASTSTREAM_DIRECTION_SOURCE	0x2
+
+#define FASTSTREAM_SINK_SAMPLING_FREQ_44100	0x2
+#define FASTSTREAM_SINK_SAMPLING_FREQ_48000	0x1
+
+#define FASTSTREAM_SOURCE_SAMPLING_FREQ_16000	0x2
+
+#define APTX_LL_VENDOR_ID		0x0000000a
+#define APTX_LL_CODEC_ID		0x0002
+
+#define APTX_LL_CHANNEL_MODE_MONO	0x01
+#define APTX_LL_CHANNEL_MODE_STEREO	0x02
+
+#define APTX_LL_SAMPLING_FREQ_16000	0x08
+#define APTX_LL_SAMPLING_FREQ_32000	0x04
+#define APTX_LL_SAMPLING_FREQ_44100	0x02
+#define APTX_LL_SAMPLING_FREQ_48000	0x01
+
+/* Default parameters for aptX Low Latency encoder */
+
+/* Target codec buffer level = 180 */
+#define APTX_LL_TARGET_LEVEL2	0xb4
+#define APTX_LL_TARGET_LEVEL1	0x00
+
+/* Initial codec buffer level = 360 */
+#define APTX_LL_INITIAL_LEVEL2	0x68
+#define APTX_LL_INITIAL_LEVEL1	0x01
+
+/* SRA max rate 0.005 * 10000 = 50 */
+#define APTX_LL_SRA_MAX_RATE		0x32
+
+/* SRA averaging time = 1s */
+#define APTX_LL_SRA_AVG_TIME		0x01
+
+/* Good working codec buffer level = 180 */
+#define APTX_LL_GOOD_WORKING_LEVEL2	0xB4
+#define APTX_LL_GOOD_WORKING_LEVEL1	0x00
+
+#define APTX_HD_VENDOR_ID		0x000000D7
+#define APTX_HD_CODEC_ID		0x0024
+
+#define APTX_HD_CHANNEL_MODE_MONO	0x1
+#define APTX_HD_CHANNEL_MODE_STEREO	0x2
+
+#define APTX_HD_SAMPLING_FREQ_16000	0x8
+#define APTX_HD_SAMPLING_FREQ_32000	0x4
+#define APTX_HD_SAMPLING_FREQ_44100	0x2
+#define APTX_HD_SAMPLING_FREQ_48000	0x1
+
+#define LDAC_VENDOR_ID			0x0000012d
+#define LDAC_CODEC_ID			0x00aa
+
+#define LDAC_SAMPLING_FREQ_44100	0x20
+#define LDAC_SAMPLING_FREQ_48000	0x10
+#define LDAC_SAMPLING_FREQ_88200	0x08
+#define LDAC_SAMPLING_FREQ_96000	0x04
+#define LDAC_SAMPLING_FREQ_176400	0x02
+#define LDAC_SAMPLING_FREQ_192000	0x01
+
+#define LDAC_CHANNEL_MODE_MONO		0x04
+#define LDAC_CHANNEL_MODE_DUAL		0x02
+#define LDAC_CHANNEL_MODE_STEREO	0x01
+
+typedef struct {
+	uint8_t vendor_id4;
+	uint8_t vendor_id3;
+	uint8_t vendor_id2;
+	uint8_t vendor_id1;
+	uint8_t codec_id2;
+	uint8_t codec_id1;
+} __attribute__ ((packed)) a2dp_vendor_codec_t;
+
+#define A2DP_GET_VENDOR_ID(a) ( \
+		(((uint32_t)(a).vendor_id4) <<  0) | \
+		(((uint32_t)(a).vendor_id3) <<  8) | \
+		(((uint32_t)(a).vendor_id2) << 16) | \
+		(((uint32_t)(a).vendor_id1) << 24) \
+	)
+#define A2DP_GET_CODEC_ID(a) ((a).codec_id2 | (((uint16_t)(a).codec_id1) << 8))
+#define A2DP_SET_VENDOR_ID_CODEC_ID(v, c) ((a2dp_vendor_codec_t){ \
+		.vendor_id4 = (((v) >>  0) & 0xff), \
+		.vendor_id3 = (((v) >>  8) & 0xff), \
+		.vendor_id2 = (((v) >> 16) & 0xff), \
+		.vendor_id1 = (((v) >> 24) & 0xff), \
+		.codec_id2 = (((c) >> 0) & 0xff), \
+		.codec_id1 = (((c) >> 8) & 0xff), \
+	})
+
+typedef struct {
+	uint8_t reserved;
+	uint8_t target_level2;
+	uint8_t target_level1;
+	uint8_t initial_level2;
+	uint8_t initial_level1;
+	uint8_t sra_max_rate;
+	uint8_t sra_avg_time;
+	uint8_t good_working_level2;
+	uint8_t good_working_level1;
+} __attribute__ ((packed)) a2dp_aptx_ll_new_caps_t;
+
+typedef struct {
+	a2dp_vendor_codec_t info;
+	uint8_t frequency;
+	uint8_t channel_mode;
+} __attribute__ ((packed)) a2dp_ldac_t;
+
+#if defined(__BYTE_ORDER) && defined(__LITTLE_ENDIAN) && \
+	__BYTE_ORDER == __LITTLE_ENDIAN
+
+typedef struct {
+	uint8_t channel_mode:4;
+	uint8_t frequency:4;
+	uint8_t allocation_method:2;
+	uint8_t subbands:2;
+	uint8_t block_length:4;
+	uint8_t min_bitpool;
+	uint8_t max_bitpool;
+} __attribute__ ((packed)) a2dp_sbc_t;
+
+typedef struct {
+	uint8_t channel_mode:4;
+	uint8_t crc:1;
+	uint8_t layer:3;
+	uint8_t frequency:6;
+	uint8_t mpf:1;
+	uint8_t rfa:1;
+	uint8_t bitrate1:7;
+	uint8_t vbr:1;
+	uint8_t bitrate2;
+} __attribute__ ((packed)) a2dp_mpeg_t;
+
+typedef struct {
+	uint8_t object_type;
+	uint8_t frequency1;
+	uint8_t rfa:2;
+	uint8_t channels:2;
+	uint8_t frequency2:4;
+	uint8_t bitrate1:7;
+	uint8_t vbr:1;
+	uint8_t bitrate2;
+	uint8_t bitrate3;
+} __attribute__ ((packed)) a2dp_aac_t;
+
+typedef struct {
+	a2dp_vendor_codec_t info;
+	uint8_t channel_mode:4;
+	uint8_t frequency:4;
+} __attribute__ ((packed)) a2dp_aptx_t;
+
+typedef struct {
+	a2dp_vendor_codec_t info;
+	uint8_t direction;
+	uint8_t sink_frequency:4;
+	uint8_t source_frequency:4;
+} __attribute__ ((packed)) a2dp_faststream_t;
+
+typedef struct {
+	a2dp_vendor_codec_t info;
+	uint8_t channel_mode:4;
+	uint8_t frequency:4;
+	uint8_t bidirect_link:1;
+	uint8_t has_new_caps:1;
+	uint8_t reserved:6;
+	a2dp_aptx_ll_new_caps_t new_caps[0];
+} __attribute__ ((packed)) a2dp_aptx_ll_t;
+
+typedef struct {
+	a2dp_vendor_codec_t info;
+	uint8_t channel_mode:4;
+	uint8_t frequency:4;
+	uint8_t reserved0;
+	uint8_t reserved1;
+	uint8_t reserved2;
+	uint8_t reserved3;
+} __attribute__ ((packed)) a2dp_aptx_hd_t;
+
+#elif defined(__BYTE_ORDER) && defined(__BIG_ENDIAN) && \
+	__BYTE_ORDER == __BIG_ENDIAN
+
+typedef struct {
+	uint8_t frequency:4;
+	uint8_t channel_mode:4;
+	uint8_t block_length:4;
+	uint8_t subbands:2;
+	uint8_t allocation_method:2;
+	uint8_t min_bitpool;
+	uint8_t max_bitpool;
+} __attribute__ ((packed)) a2dp_sbc_t;
+
+typedef struct {
+	uint8_t layer:3;
+	uint8_t crc:1;
+	uint8_t channel_mode:4;
+	uint8_t rfa:1;
+	uint8_t mpf:1;
+	uint8_t frequency:6;
+	uint8_t vbr:1;
+	uint8_t bitrate1:7;
+	uint8_t bitrate2;
+} __attribute__ ((packed)) a2dp_mpeg_t;
+
+typedef struct {
+	uint8_t object_type;
+	uint8_t frequency1;
+	uint8_t frequency2:4;
+	uint8_t channels:2;
+	uint8_t rfa:2;
+	uint8_t vbr:1;
+	uint8_t bitrate1:7;
+	uint8_t bitrate2;
+	uint8_t bitrate3;
+} __attribute__ ((packed)) a2dp_aac_t;
+
+typedef struct {
+	a2dp_vendor_codec_t info;
+	uint8_t frequency:4;
+	uint8_t channel_mode:4;
+} __attribute__ ((packed)) a2dp_aptx_t;
+
+typedef struct {
+	a2dp_vendor_codec_t info;
+	uint8_t direction;
+	uint8_t source_frequency:4;
+	uint8_t sink_frequency:4;
+} __attribute__ ((packed)) a2dp_faststream_t;
+
+typedef struct {
+	a2dp_vendor_codec_t info;
+	uint8_t frequency:4;
+	uint8_t channel_mode:4;
+	uint8_t reserved:6;
+	uint8_t has_new_caps:1;
+	uint8_t bidirect_link:1;
+	a2dp_aptx_ll_new_caps_t new_caps[0];
+} __attribute__ ((packed)) a2dp_aptx_ll_t;
+
+typedef struct {
+	a2dp_vendor_codec_t info;
+	uint8_t frequency:4;
+	uint8_t channel_mode:4;
+	uint8_t reserved0;
+	uint8_t reserved1;
+	uint8_t reserved2;
+	uint8_t reserved3;
+} __attribute__ ((packed)) a2dp_aptx_hd_t;
+
+#else
+#error "Unknown byte order"
+#endif
diff --git a/src/modules/bluetooth/a2dp/a2dp_sbc.c b/src/modules/bluetooth/a2dp/a2dp_sbc.c
new file mode 100644
index 000000000..558a04dbd
--- /dev/null
+++ b/src/modules/bluetooth/a2dp/a2dp_sbc.c
@@ -0,0 +1,679 @@ 
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2008-2013 João Paulo Rechi Vita
+  Copyright 2011-2013 BMW Car IT GmbH.
+  Copyright 2018      Huang-Huang Bao
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as
+  published by the Free Software Foundation; either version 2.1 of the
+  License, or (at your option) any later version.
+
+  PulseAudio is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <sbc/sbc.h>
+#include <arpa/inet.h>
+#include <string.h>
+
+#ifdef HAVE_CONFIG_H
+
+#include <config.h>
+
+#endif
+
+#include <pulse/xmalloc.h>
+#include <pulsecore/once.h>
+
+#include "a2dp-api.h"
+
+#define streq(a, b) (!strcmp((a),(b)))
+
+#define BITPOOL_DEC_LIMIT 32
+#define BITPOOL_DEC_STEP 5
+
+typedef struct sbc_info {
+    pa_a2dp_source_read_cb_t read_pcm;
+    pa_a2dp_source_read_buf_free_cb_t read_buf_free;
+
+    bool is_a2dp_sink;
+
+    int channel_mode;
+    sbc_t sbc;                           /* Codec data */
+    bool sbc_initialized;                /* Keep track if the encoder is initialized */
+    size_t codesize, frame_length;       /* SBC Codesize, frame_length. We simply cache those values here */
+    uint16_t seq_num;                    /* Cumulative packet sequence */
+    uint8_t min_bitpool;
+    uint8_t max_bitpool;
+
+    size_t read_block_size;
+    size_t write_block_size;
+
+} sbc_info_t;
+
+static bool pa_sbc_decoder_load() {
+    /* SBC libs dynamically linked */
+    return true;
+}
+
+static bool pa_sbc_encoder_load() {
+    /* SBC libs dynamically linked */
+    return true;
+}
+
+static bool
+pa_sbc_decoder_init(void **codec_data) {
+    sbc_info_t *info = pa_xmalloc0(sizeof(sbc_info_t));
+    *codec_data = info;
+    info->is_a2dp_sink = true;
+    return true;
+}
+
+static bool
+pa_sbc_encoder_init(pa_a2dp_source_read_cb_t read_cb, pa_a2dp_source_read_buf_free_cb_t free_cb, void **codec_data) {
+    sbc_info_t *info = pa_xmalloc0(sizeof(sbc_info_t));
+    *codec_data = info;
+    info->is_a2dp_sink = false;
+    info->read_pcm = read_cb;
+    info->read_buf_free = free_cb;
+    return true;
+}
+
+static int pa_sbc_update_user_config(pa_proplist *user_config, void **codec_data) {
+    return 0;
+}
+
+static size_t
+pa_sbc_decode(const void *read_buf, size_t read_buf_size, void *write_buf, size_t write_buf_size, size_t *_decoded,
+              uint32_t *timestamp, void **codec_data) {
+    const struct rtp_header *header;
+    const struct rtp_payload *payload;
+    const void *p;
+    void *d;
+    size_t to_write, to_decode;
+    size_t total_written = 0;
+    sbc_info_t *sbc_info = *codec_data;
+    pa_assert(sbc_info);
+
+    header = read_buf;
+    payload = (struct rtp_payload *) ((uint8_t *) read_buf + sizeof(*header));
+
+    *timestamp = ntohl(header->timestamp);
+
+    p = (uint8_t *) read_buf + sizeof(*header) + sizeof(*payload);
+    to_decode = read_buf_size - sizeof(*header) - sizeof(*payload);
+
+    d = write_buf;
+    to_write = write_buf_size;
+
+    *_decoded = 0;
+    while (PA_LIKELY(to_decode > 0)) {
+        size_t written;
+        ssize_t decoded;
+
+        decoded = sbc_decode(&sbc_info->sbc,
+                             p, to_decode,
+                             d, to_write,
+                             &written);
+
+        if (PA_UNLIKELY(decoded <= 0)) {
+            pa_log_error("SBC decoding error (%li)", (long) decoded);
+            *_decoded = 0;
+            return 0;
+        }
+
+        total_written += written;
+
+        /* Reset frame length, it can be changed due to bitpool change */
+        sbc_info->frame_length = sbc_get_frame_length(&sbc_info->sbc);
+
+        pa_assert_fp((size_t) decoded <= to_decode);
+        pa_assert_fp((size_t) decoded == sbc_info->frame_length);
+
+        pa_assert_fp((size_t) written == sbc_info->codesize);
+
+        *_decoded += decoded;
+        p = (const uint8_t *) p + decoded;
+        to_decode -= decoded;
+
+        d = (uint8_t *) d + written;
+        to_write -= written;
+    }
+
+    return total_written;
+}
+
+static size_t
+pa_sbc_encode(uint32_t timestamp, void *write_buf, size_t write_buf_size, size_t *_encoded, void *read_cb_data,
+              void **codec_data) {
+    struct rtp_header *header;
+    struct rtp_payload *payload;
+    size_t nbytes;
+    void *d;
+    const void *p;
+    size_t to_write, to_encode;
+    unsigned frame_count;
+    sbc_info_t *sbc_info = *codec_data;
+    pa_assert(sbc_info);
+
+    header = write_buf;
+    payload = (struct rtp_payload *) ((uint8_t *) write_buf + sizeof(*header));
+
+    frame_count = 0;
+
+    /* Try to create a packet of the full MTU */
+
+    sbc_info->read_pcm(&p, (size_t) sbc_info->write_block_size, read_cb_data);
+
+    to_encode = sbc_info->write_block_size;
+
+    d = (uint8_t *) write_buf + sizeof(*header) + sizeof(*payload);
+    to_write = write_buf_size - sizeof(*header) - sizeof(*payload);
+
+    *_encoded = 0;
+    while (PA_LIKELY(to_encode > 0 && to_write > 0)) {
+        ssize_t written;
+        ssize_t encoded;
+
+        encoded = sbc_encode(&sbc_info->sbc,
+                             p, to_encode,
+                             d, to_write,
+                             &written);
+
+        if (PA_UNLIKELY(encoded <= 0)) {
+            pa_log_error("SBC encoding error (%li)", (long) encoded);
+            sbc_info->read_buf_free(&p, read_cb_data);
+            *_encoded = 0;
+            return 0;
+        }
+
+        pa_assert_fp((size_t) encoded <= to_encode);
+        pa_assert_fp((size_t) encoded == sbc_info->codesize);
+
+        pa_assert_fp((size_t) written <= to_write);
+        pa_assert_fp((size_t) written == sbc_info->frame_length);
+
+        p = (const uint8_t *) p + encoded;
+        to_encode -= encoded;
+        *_encoded += encoded;
+
+        d = (uint8_t *) d + written;
+        to_write -= written;
+
+        frame_count++;
+    }
+
+    sbc_info->read_buf_free(&p, read_cb_data);
+
+    pa_assert(to_encode == 0);
+
+    PA_ONCE_BEGIN
+            {
+                    const char *impl = sbc_get_implementation_info(&sbc_info->sbc);
+                    pa_log_debug("Using SBC encoder implementation: %s", impl ? impl : "NULL");
+            }
+    PA_ONCE_END;
+
+    /* write it to the fifo */
+    memset(write_buf, 0, sizeof(*header) + sizeof(*payload));
+    header->v = 2;
+    header->pt = 1;
+    header->sequence_number = htons(sbc_info->seq_num++);
+    header->timestamp = htonl(timestamp);
+    header->ssrc = htonl(1);
+    payload->frame_count = frame_count;
+
+    nbytes = (uint8_t *) d - (uint8_t *) write_buf;
+
+    return nbytes;
+}
+
+static void
+pa_sbc_config_transport(pa_sample_spec default_sample_spec, const void *configuration, size_t configuration_size,
+                        pa_sample_spec *sample_spec, void **codec_data) {
+    sbc_info_t *sbc_info = *codec_data;
+    a2dp_sbc_t *config = (a2dp_sbc_t *) configuration;
+
+    pa_assert(sbc_info);
+    pa_assert_se(configuration_size == sizeof(*config));
+
+    if (sbc_info->sbc_initialized)
+        sbc_reinit(&sbc_info->sbc, 0);
+    else
+        sbc_init(&sbc_info->sbc, 0);
+    sbc_info->sbc_initialized = true;
+
+    sample_spec->format = PA_SAMPLE_S16LE;
+
+    switch (config->frequency) {
+        case SBC_SAMPLING_FREQ_16000:
+            sbc_info->sbc.frequency = SBC_FREQ_16000;
+            sample_spec->rate = 16000U;
+            break;
+        case SBC_SAMPLING_FREQ_32000:
+            sbc_info->sbc.frequency = SBC_FREQ_32000;
+            sample_spec->rate = 32000U;
+            break;
+        case SBC_SAMPLING_FREQ_44100:
+            sbc_info->sbc.frequency = SBC_FREQ_44100;
+            sample_spec->rate = 44100U;
+            break;
+        case SBC_SAMPLING_FREQ_48000:
+            sbc_info->sbc.frequency = SBC_FREQ_48000;
+            sample_spec->rate = 48000U;
+            break;
+        default:
+            pa_assert_not_reached();
+    }
+
+    switch (config->channel_mode) {
+        case SBC_CHANNEL_MODE_MONO:
+            sbc_info->sbc.mode = SBC_MODE_MONO;
+            sample_spec->channels = 1;
+            break;
+        case SBC_CHANNEL_MODE_DUAL_CHANNEL:
+            sbc_info->sbc.mode = SBC_MODE_DUAL_CHANNEL;
+            sample_spec->channels = 2;
+            break;
+        case SBC_CHANNEL_MODE_STEREO:
+            sbc_info->sbc.mode = SBC_MODE_STEREO;
+            sample_spec->channels = 2;
+            break;
+        case SBC_CHANNEL_MODE_JOINT_STEREO:
+            sbc_info->sbc.mode = SBC_MODE_JOINT_STEREO;
+            sample_spec->channels = 2;
+            break;
+        default:
+            pa_assert_not_reached();
+    }
+
+    switch (config->allocation_method) {
+        case SBC_ALLOCATION_SNR:
+            sbc_info->sbc.allocation = SBC_AM_SNR;
+            break;
+        case SBC_ALLOCATION_LOUDNESS:
+            sbc_info->sbc.allocation = SBC_AM_LOUDNESS;
+            break;
+        default:
+            pa_assert_not_reached();
+    }
+
+    switch (config->subbands) {
+        case SBC_SUBBANDS_4:
+            sbc_info->sbc.subbands = SBC_SB_4;
+            break;
+        case SBC_SUBBANDS_8:
+            sbc_info->sbc.subbands = SBC_SB_8;
+            break;
+        default:
+            pa_assert_not_reached();
+    }
+
+    switch (config->block_length) {
+        case SBC_BLOCK_LENGTH_4:
+            sbc_info->sbc.blocks = SBC_BLK_4;
+            break;
+        case SBC_BLOCK_LENGTH_8:
+            sbc_info->sbc.blocks = SBC_BLK_8;
+            break;
+        case SBC_BLOCK_LENGTH_12:
+            sbc_info->sbc.blocks = SBC_BLK_12;
+            break;
+        case SBC_BLOCK_LENGTH_16:
+            sbc_info->sbc.blocks = SBC_BLK_16;
+            break;
+        default:
+            pa_assert_not_reached();
+    }
+
+
+    sbc_info->min_bitpool = config->min_bitpool;
+    sbc_info->max_bitpool = config->max_bitpool;
+
+    /* Set minimum bitpool for source to get the maximum possible block_size */
+    sbc_info->sbc.bitpool = sbc_info->is_a2dp_sink ? sbc_info->min_bitpool : sbc_info->max_bitpool;
+    sbc_info->codesize = sbc_get_codesize(&sbc_info->sbc);
+    sbc_info->frame_length = sbc_get_frame_length(&sbc_info->sbc);
+
+    pa_log_info("SBC parameters: allocation=%u, subbands=%u, blocks=%u, bitpool=%u",
+                sbc_info->sbc.allocation, sbc_info->sbc.subbands ? 8 : 4, sbc_info->sbc.blocks, sbc_info->sbc.bitpool);
+};
+
+static void pa_sbc_get_read_block_size(size_t read_link_mtu, size_t *read_block_size, void **codec_data) {
+    sbc_info_t *sbc_info = *codec_data;
+    pa_assert(sbc_info);
+    *read_block_size =
+            (read_link_mtu - sizeof(struct rtp_header) - sizeof(struct rtp_payload))
+            / sbc_info->frame_length * sbc_info->codesize;
+    sbc_info->read_block_size = *read_block_size;
+};
+
+static void pa_sbc_get_write_block_size(size_t write_link_mtu, size_t *write_block_size, void **codec_data) {
+    sbc_info_t *sbc_info = *codec_data;
+    pa_assert(sbc_info);
+    *write_block_size =
+            (write_link_mtu - sizeof(struct rtp_header) - sizeof(struct rtp_payload))
+            / sbc_info->frame_length * sbc_info->codesize;
+    sbc_info->write_block_size = *write_block_size;
+};
+
+static void a2dp_set_bitpool(uint8_t bitpool, void **codec_data) {
+    sbc_info_t *sbc_info = *codec_data;
+
+    if (sbc_info->sbc.bitpool == bitpool)
+        return;
+
+    if (bitpool > sbc_info->max_bitpool)
+        bitpool = sbc_info->max_bitpool;
+    else if (bitpool < sbc_info->min_bitpool)
+        bitpool = sbc_info->min_bitpool;
+
+    sbc_info->sbc.bitpool = bitpool;
+
+    sbc_info->codesize = sbc_get_codesize(&sbc_info->sbc);
+    sbc_info->frame_length = sbc_get_frame_length(&sbc_info->sbc);
+
+    pa_log_debug("Bitpool has changed to %u", sbc_info->sbc.bitpool);
+}
+
+static void a2dp_reduce_bitpool(void **codec_data) {
+    sbc_info_t *sbc_info = *codec_data;
+    uint8_t bitpool;
+
+    /* Check if bitpool is already at its limit */
+    if (sbc_info->sbc.bitpool <= BITPOOL_DEC_LIMIT)
+        return;
+
+    bitpool = (uint8_t)(sbc_info->sbc.bitpool - BITPOOL_DEC_STEP);
+
+    if (bitpool < BITPOOL_DEC_LIMIT)
+        bitpool = BITPOOL_DEC_LIMIT;
+
+    a2dp_set_bitpool(bitpool, codec_data);
+}
+
+static void pa_sbc_setup_stream(void **codec_data) {
+    sbc_info_t *sbc_info = *codec_data;
+    pa_assert(sbc_info);
+    if (!sbc_info->is_a2dp_sink)
+        a2dp_set_bitpool(sbc_info->max_bitpool, codec_data);
+};
+
+static void pa_sbc_free(void **codec_data) {
+    sbc_info_t *sbc_info = *codec_data;
+    if (!sbc_info)
+        return;
+
+
+    pa_xfree(sbc_info);
+    *codec_data = NULL;
+
+};
+
+static size_t pa_sbc_get_capabilities(void **_capabilities) {
+    a2dp_sbc_t *capabilities = pa_xmalloc0(sizeof(a2dp_sbc_t));
+
+    capabilities->channel_mode = SBC_CHANNEL_MODE_MONO | SBC_CHANNEL_MODE_DUAL_CHANNEL | SBC_CHANNEL_MODE_STEREO |
+                                 SBC_CHANNEL_MODE_JOINT_STEREO;
+    capabilities->frequency = SBC_SAMPLING_FREQ_16000 | SBC_SAMPLING_FREQ_32000 | SBC_SAMPLING_FREQ_44100 |
+                              SBC_SAMPLING_FREQ_48000;
+    capabilities->allocation_method = SBC_ALLOCATION_SNR | SBC_ALLOCATION_LOUDNESS;
+    capabilities->subbands = SBC_SUBBANDS_4 | SBC_SUBBANDS_8;
+    capabilities->block_length = SBC_BLOCK_LENGTH_4 | SBC_BLOCK_LENGTH_8 | SBC_BLOCK_LENGTH_12 | SBC_BLOCK_LENGTH_16;
+    capabilities->min_bitpool = SBC_MIN_BITPOOL;
+    capabilities->max_bitpool = SBC_MAX_BITPOOL;
+
+    *_capabilities = capabilities;
+
+    return sizeof(*capabilities);
+};
+
+static uint8_t a2dp_default_bitpool(uint8_t freq, uint8_t mode) {
+    /* These bitpool values were chosen based on the A2DP spec recommendation */
+    switch (freq) {
+        case SBC_SAMPLING_FREQ_16000:
+        case SBC_SAMPLING_FREQ_32000:
+            return 53;
+
+        case SBC_SAMPLING_FREQ_44100:
+
+            switch (mode) {
+                case SBC_CHANNEL_MODE_MONO:
+                case SBC_CHANNEL_MODE_DUAL_CHANNEL:
+                    return 31;
+
+                case SBC_CHANNEL_MODE_STEREO:
+                case SBC_CHANNEL_MODE_JOINT_STEREO:
+                    return 53;
+                default:
+                    break;
+            }
+
+            pa_log_warn("Invalid channel mode %u", mode);
+            return 53;
+
+        case SBC_SAMPLING_FREQ_48000:
+
+            switch (mode) {
+                case SBC_CHANNEL_MODE_MONO:
+                case SBC_CHANNEL_MODE_DUAL_CHANNEL:
+                    return 29;
+
+                case SBC_CHANNEL_MODE_STEREO:
+                case SBC_CHANNEL_MODE_JOINT_STEREO:
+                    return 51;
+                default:
+                    break;
+            }
+
+            pa_log_warn("Invalid channel mode %u", mode);
+            return 51;
+        default:
+            break;
+    }
+
+    pa_log_warn("Invalid sampling freq %u", freq);
+    return 53;
+}
+
+static size_t
+pa_sbc_select_configuration(const pa_sample_spec default_sample_spec, const uint8_t *supported_capabilities,
+                            const size_t capabilities_size, void **configuration) {
+    a2dp_sbc_t *cap = (a2dp_sbc_t *) supported_capabilities;
+    a2dp_sbc_t *config = pa_xmalloc0(sizeof(a2dp_sbc_t));
+    pa_a2dp_freq_cap_t sbc_freq_cap, sbc_freq_table[] = {
+            {16000U, SBC_SAMPLING_FREQ_16000},
+            {32000U, SBC_SAMPLING_FREQ_32000},
+            {44100U, SBC_SAMPLING_FREQ_44100},
+            {48000U, SBC_SAMPLING_FREQ_48000}
+    };
+
+    if (capabilities_size != sizeof(a2dp_sbc_t))
+        return 0;
+
+    if (!pa_a2dp_select_cap_frequency(cap->frequency, default_sample_spec, sbc_freq_table,
+                                      PA_ELEMENTSOF(sbc_freq_table), &sbc_freq_cap))
+        return 0;
+
+    config->frequency = (uint8_t) sbc_freq_cap.cap;
+
+    if (default_sample_spec.channels <= 1) {
+        if (cap->channel_mode & SBC_CHANNEL_MODE_MONO)
+            config->channel_mode = SBC_CHANNEL_MODE_MONO;
+        else if (cap->channel_mode & SBC_CHANNEL_MODE_JOINT_STEREO)
+            config->channel_mode = SBC_CHANNEL_MODE_JOINT_STEREO;
+        else if (cap->channel_mode & SBC_CHANNEL_MODE_STEREO)
+            config->channel_mode = SBC_CHANNEL_MODE_STEREO;
+        else if (cap->channel_mode & SBC_CHANNEL_MODE_DUAL_CHANNEL)
+            config->channel_mode = SBC_CHANNEL_MODE_DUAL_CHANNEL;
+        else {
+            pa_log_error("No supported channel modes");
+            return 0;
+        }
+    }
+
+    if (default_sample_spec.channels >= 2) {
+        if (cap->channel_mode & SBC_CHANNEL_MODE_JOINT_STEREO)
+            config->channel_mode = SBC_CHANNEL_MODE_JOINT_STEREO;
+        else if (cap->channel_mode & SBC_CHANNEL_MODE_STEREO)
+            config->channel_mode = SBC_CHANNEL_MODE_STEREO;
+        else if (cap->channel_mode & SBC_CHANNEL_MODE_DUAL_CHANNEL)
+            config->channel_mode = SBC_CHANNEL_MODE_DUAL_CHANNEL;
+        else if (cap->channel_mode & SBC_CHANNEL_MODE_MONO)
+            config->channel_mode = SBC_CHANNEL_MODE_MONO;
+        else {
+            pa_log_error("No supported channel modes");
+            return 0;
+        }
+    }
+    if (cap->block_length & SBC_BLOCK_LENGTH_16)
+        config->block_length = SBC_BLOCK_LENGTH_16;
+    else if (cap->block_length & SBC_BLOCK_LENGTH_12)
+        config->block_length = SBC_BLOCK_LENGTH_12;
+    else if (cap->block_length & SBC_BLOCK_LENGTH_8)
+        config->block_length = SBC_BLOCK_LENGTH_8;
+    else if (cap->block_length & SBC_BLOCK_LENGTH_4)
+        config->block_length = SBC_BLOCK_LENGTH_4;
+    else {
+        pa_log_error("No supported block lengths");
+        return 0;
+    }
+
+    if (cap->subbands & SBC_SUBBANDS_8)
+        config->subbands = SBC_SUBBANDS_8;
+    else if (cap->subbands & SBC_SUBBANDS_4)
+        config->subbands = SBC_SUBBANDS_4;
+    else {
+        pa_log_error("No supported subbands");
+        return 0;
+    }
+
+    if (cap->allocation_method & SBC_ALLOCATION_LOUDNESS)
+        config->allocation_method = SBC_ALLOCATION_LOUDNESS;
+    else if (cap->allocation_method & SBC_ALLOCATION_SNR)
+        config->allocation_method = SBC_ALLOCATION_SNR;
+
+    config->min_bitpool = (uint8_t) PA_MAX(SBC_MIN_BITPOOL, cap->min_bitpool);
+    config->max_bitpool = (uint8_t) PA_MIN(a2dp_default_bitpool(config->frequency, config->channel_mode),
+                                           cap->max_bitpool);
+
+    if (config->min_bitpool > config->max_bitpool)
+        return 0;
+
+    *configuration = config;
+    return sizeof(*config);
+};
+
+static void pa_sbc_free_capabilities(void **capabilities) {
+    if (!capabilities || !*capabilities)
+        return;
+    pa_xfree(*capabilities);
+    *capabilities = NULL;
+}
+
+static bool pa_sbc_validate_configuration(const uint8_t *selected_configuration, const size_t configuration_size) {
+    a2dp_sbc_t *c = (a2dp_sbc_t *) selected_configuration;
+
+    if (configuration_size != sizeof(a2dp_sbc_t)) {
+        pa_log_error("SBC configuration array of invalid size");
+        return false;
+    }
+
+    switch (c->frequency) {
+        case SBC_SAMPLING_FREQ_16000:
+        case SBC_SAMPLING_FREQ_32000:
+        case SBC_SAMPLING_FREQ_44100:
+        case SBC_SAMPLING_FREQ_48000:
+            break;
+        default:
+            pa_log_error("Invalid sampling frequency in SBC configuration");
+            return false;
+    }
+
+    switch (c->channel_mode) {
+        case SBC_CHANNEL_MODE_MONO:
+        case SBC_CHANNEL_MODE_DUAL_CHANNEL:
+        case SBC_CHANNEL_MODE_STEREO:
+        case SBC_CHANNEL_MODE_JOINT_STEREO:
+            break;
+        default:
+            pa_log_error("Invalid channel mode in SBC Configuration");
+            return false;
+    }
+
+    switch (c->allocation_method) {
+        case SBC_ALLOCATION_SNR:
+        case SBC_ALLOCATION_LOUDNESS:
+            break;
+        default:
+            pa_log_error("Invalid allocation method in SBC configuration");
+            return false;
+    }
+
+    switch (c->subbands) {
+        case SBC_SUBBANDS_4:
+        case SBC_SUBBANDS_8:
+            break;
+        default:
+            pa_log_error("Invalid SBC subbands in SBC configuration");
+            return false;
+    }
+
+    switch (c->block_length) {
+        case SBC_BLOCK_LENGTH_4:
+        case SBC_BLOCK_LENGTH_8:
+        case SBC_BLOCK_LENGTH_12:
+        case SBC_BLOCK_LENGTH_16:
+            break;
+        default:
+            pa_log_error("Invalid block length in configuration");
+            return false;
+    }
+
+    return true;
+};
+
+
+static pa_a2dp_source_t pa_sbc_source = {
+        .encoder_load = pa_sbc_encoder_load,
+        .init = pa_sbc_encoder_init,
+        .update_user_config = pa_sbc_update_user_config,
+        .encode = pa_sbc_encode,
+        .config_transport=pa_sbc_config_transport,
+        .get_block_size=pa_sbc_get_write_block_size,
+        .setup_stream = pa_sbc_setup_stream,
+        .set_tx_length = NULL,
+        .decrease_quality = a2dp_reduce_bitpool,
+        .free = pa_sbc_free
+};
+
+static pa_a2dp_sink_t pa_sbc_sink = {
+        .decoder_load = pa_sbc_decoder_load,
+        .init = pa_sbc_decoder_init,
+        .update_user_config = pa_sbc_update_user_config,
+        .config_transport = pa_sbc_config_transport,
+        .get_block_size = pa_sbc_get_read_block_size,
+        .setup_stream = pa_sbc_setup_stream,
+        .decode = pa_sbc_decode,
+        .free = pa_sbc_free
+};
+
+const pa_a2dp_codec_t pa_a2dp_sbc = {
+        .name = "SBC",
+        .codec = A2DP_CODEC_SBC,
+        .vendor_codec = NULL,
+        .a2dp_sink = &pa_sbc_sink,
+        .a2dp_source = &pa_sbc_source,
+        .get_capabilities = pa_sbc_get_capabilities,
+        .select_configuration = pa_sbc_select_configuration,
+        .free_capabilities = pa_sbc_free_capabilities,
+        .free_configuration = pa_sbc_free_capabilities,
+        .validate_configuration = pa_sbc_validate_configuration
+};
\ No newline at end of file
diff --git a/src/modules/bluetooth/a2dp/a2dp_util.c b/src/modules/bluetooth/a2dp/a2dp_util.c
new file mode 100644
index 000000000..cc9382f2e
--- /dev/null
+++ b/src/modules/bluetooth/a2dp/a2dp_util.c
@@ -0,0 +1,316 @@ 
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2018 Huang-Huang Bao
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as
+  published by the Free Software Foundation; either version 2.1 of the
+  License, or (at your option) any later version.
+
+  PulseAudio is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <string.h>
+#include <pulse/xmalloc.h>
+
+#include "a2dp-api.h"
+
+#define streq(a, b) (!strcmp((a),(b)))
+
+#define A2DP_SOURCE_ENDPOINT "/MediaEndpoint/A2DPSource"
+#define A2DP_SINK_ENDPOINT "/MediaEndpoint/A2DPSink"
+
+#define A2DP_SBC_SRC_ENDPOINT A2DP_SOURCE_ENDPOINT "/SBC"
+#define A2DP_SBC_SNK_ENDPOINT A2DP_SINK_ENDPOINT "/SBC"
+
+#define A2DP_VENDOR_SRC_ENDPOINT A2DP_SOURCE_ENDPOINT "/VENDOR"
+#define A2DP_VENDOR_SNK_ENDPOINT A2DP_SINK_ENDPOINT "/VENDOR"
+
+
+#define PA_A2DP_PRIORITY_DISABLE 0
+#define PA_A2DP_PRIORITY_MIN 1
+
+
+struct pa_a2dp_config {
+    int max_priority;
+    pa_hashmap *a2dp_sinks;
+    pa_hashmap *a2dp_sources;
+    pa_hashmap *active_index_priorities;
+    pa_hashmap *ordered_indices;
+};
+
+static unsigned int_hash_func(const void *p) {
+    return (unsigned) *((const int *) p);
+}
+
+static int int_compare_func(const void *a, const void *b) {
+    const int x = *((const int *) a);
+    const int y = *((const int *) b);
+    return x < y ? -1 : (x > y ? 1 : 0);
+};
+
+
+void pa_a2dp_init(pa_a2dp_config_t **a2dp_config) {
+    pa_a2dp_config_t *config;
+    pa_a2dp_codec_index_t codec_index = PA_A2DP_SINK_MIN;
+    const pa_a2dp_codec_t *a2dp_codec;
+
+    config = pa_xmalloc(sizeof(pa_a2dp_config_t));
+    *a2dp_config = config;
+
+    config->a2dp_sinks = pa_hashmap_new_full(int_hash_func, int_compare_func, pa_xfree, pa_xfree);
+    config->a2dp_sources = pa_hashmap_new_full(int_hash_func, int_compare_func, pa_xfree, pa_xfree);
+    config->active_index_priorities = pa_hashmap_new_full(int_hash_func, int_compare_func,
+                                                          pa_xfree, pa_xfree);
+    config->ordered_indices = NULL;
+
+    config->max_priority = PA_A2DP_PRIORITY_MIN - 1;
+    while (++codec_index < PA_A2DP_SINK_MAX) {
+        pa_a2dp_codec_index_to_a2dp_codec(codec_index, &a2dp_codec);
+        if (!a2dp_codec || !a2dp_codec->a2dp_sink || !a2dp_codec->a2dp_sink->decoder_load())
+            continue;
+        ++config->max_priority;
+        pa_hashmap_put(config->a2dp_sinks, pa_xmemdup(&config->max_priority, sizeof(int)),
+                       pa_xmemdup(&codec_index, sizeof(pa_a2dp_codec_index_t)));
+        pa_hashmap_put(config->active_index_priorities, pa_xmemdup(&codec_index, sizeof(pa_a2dp_codec_index_t)),
+                       pa_xmemdup(&config->max_priority, sizeof(int)));
+        a2dp_codec->a2dp_sink->priority = config->max_priority;
+    }
+    codec_index = PA_A2DP_SOURCE_MIN;
+    while (++codec_index < PA_A2DP_SOURCE_MAX) {
+        pa_a2dp_codec_index_to_a2dp_codec(codec_index, &a2dp_codec);
+        if (!a2dp_codec || !a2dp_codec->a2dp_source || !a2dp_codec->a2dp_source->encoder_load())
+            continue;
+        ++config->max_priority;
+        pa_hashmap_put(config->a2dp_sources, pa_xmemdup(&config->max_priority, sizeof(int)),
+                       pa_xmemdup(&codec_index, sizeof(pa_a2dp_codec_index_t)));
+        pa_hashmap_put(config->active_index_priorities, pa_xmemdup(&codec_index, sizeof(pa_a2dp_codec_index_t)),
+                       pa_xmemdup(&config->max_priority, sizeof(int)));
+        a2dp_codec->a2dp_source->priority = config->max_priority;
+    }
+};
+
+void pa_a2dp_set_max_priority(pa_a2dp_codec_index_t codec_index, pa_a2dp_config_t **a2dp_config) {
+    const pa_a2dp_codec_t *a2dp_codec;
+    pa_a2dp_config_t *config = *a2dp_config;
+
+    pa_a2dp_codec_index_to_a2dp_codec(codec_index, &a2dp_codec);
+
+    if (!a2dp_codec || !pa_hashmap_remove(config->active_index_priorities, &codec_index)) {
+        printf("no entry;");
+        pa_log_debug("No such codec: %d", codec_index);
+        return;
+    }
+
+    ++config->max_priority;
+    pa_hashmap_put(config->active_index_priorities, pa_xmemdup(&codec_index, sizeof(pa_a2dp_codec_index_t)),
+                   pa_xmemdup(&config->max_priority, sizeof(int)));
+
+    if (pa_a2dp_codec_index_is_sink(codec_index))
+        a2dp_codec->a2dp_sink->priority = config->max_priority;
+    else
+        a2dp_codec->a2dp_source->priority = config->max_priority;
+};
+
+void pa_a2dp_set_disable(pa_a2dp_codec_index_t codec_index, pa_a2dp_config_t **a2dp_config) {
+    const pa_a2dp_codec_t *a2dp_codec;
+    pa_a2dp_config_t *config = *a2dp_config;
+    pa_a2dp_codec_index_to_a2dp_codec(codec_index, &a2dp_codec);
+
+    if (!a2dp_codec || !pa_hashmap_remove(config->active_index_priorities, &codec_index)) {
+        pa_log_debug("No such codec: %d", codec_index);
+        return;
+    }
+
+    if (pa_a2dp_codec_index_is_sink(codec_index))
+        a2dp_codec->a2dp_sink->priority = PA_A2DP_PRIORITY_DISABLE;
+    else
+        a2dp_codec->a2dp_source->priority = PA_A2DP_PRIORITY_DISABLE;
+};
+
+void pa_a2dp_free(pa_a2dp_config_t **a2dp_config) {
+    pa_a2dp_config_t *config = *a2dp_config;
+
+    if (!config)
+        return;
+    if (config->ordered_indices)
+        pa_hashmap_free(config->ordered_indices);
+
+    if (config->active_index_priorities)
+        pa_hashmap_free(config->active_index_priorities);
+
+    if (config->a2dp_sinks)
+        pa_hashmap_free(config->a2dp_sinks);
+
+    if (config->a2dp_sources)
+        pa_hashmap_free(config->a2dp_sources);
+
+    pa_xfree(config);
+    *a2dp_config = NULL;
+}
+
+
+void pa_a2dp_get_sink_indices(pa_hashmap **sink_indices, pa_a2dp_config_t **a2dp_config) {
+    pa_a2dp_config_t *config = *a2dp_config;
+    *sink_indices = config->a2dp_sinks;
+};
+
+void pa_a2dp_get_source_indices(pa_hashmap **source_indices, pa_a2dp_config_t **a2dp_config) {
+    pa_a2dp_config_t *config = *a2dp_config;
+    *source_indices = config->a2dp_sources;
+};
+
+void pa_a2dp_get_ordered_indices(pa_hashmap **ordered_indices, pa_a2dp_config_t **a2dp_config) {
+    void *state;
+    pa_a2dp_codec_index_t *index, *indices;
+    int *priority, i;
+    pa_a2dp_config_t *config = *a2dp_config;
+
+    indices = pa_xmalloc(sizeof(pa_a2dp_codec_index_t) * (config->max_priority + 1));
+
+    for (i = 0; i <= config->max_priority; i++)
+        indices[i] = PA_A2DP_CODEC_INDEX_UNAVAILABLE;
+
+    PA_HASHMAP_FOREACH_KV(index, priority, config->active_index_priorities, state)
+    {
+        if (*priority <= 0)
+            continue;
+        indices[*priority] = *index;
+    }
+
+    if (config->ordered_indices)
+        pa_hashmap_free(config->ordered_indices);
+    config->ordered_indices = pa_hashmap_new_full(int_hash_func, int_compare_func, pa_xfree, pa_xfree);
+
+    for (i = config->max_priority; i >= PA_A2DP_PRIORITY_MIN; i--) {
+        if (indices[i] == PA_A2DP_CODEC_INDEX_UNAVAILABLE)
+            continue;
+        priority = pa_xmemdup(&i, sizeof(int));
+        index = pa_xmemdup(indices + i, sizeof(pa_a2dp_codec_index_t));
+        pa_hashmap_put(config->ordered_indices, priority, index);
+    }
+
+    *ordered_indices = config->ordered_indices;
+};
+
+
+void pa_a2dp_codec_index_to_endpoint(pa_a2dp_codec_index_t codec_index, const char **endpoint) {
+    switch (codec_index) {
+        case PA_A2DP_SINK_SBC:
+            *endpoint = A2DP_SBC_SNK_ENDPOINT;
+            break;
+        case PA_A2DP_SOURCE_SBC:
+            *endpoint = A2DP_SBC_SRC_ENDPOINT;
+            break;
+        default:
+            *endpoint = NULL;
+    }
+};
+
+void pa_a2dp_endpoint_to_codec_index(const char *endpoint, pa_a2dp_codec_index_t *codec_index) {
+    if (streq(endpoint, A2DP_SBC_SNK_ENDPOINT))
+        *codec_index = PA_A2DP_SINK_SBC;
+    else if (streq(endpoint, A2DP_SBC_SRC_ENDPOINT))
+        *codec_index = PA_A2DP_SOURCE_SBC;
+    else
+        *codec_index = PA_A2DP_CODEC_INDEX_UNAVAILABLE;
+};
+
+void pa_a2dp_codec_index_to_a2dp_codec(pa_a2dp_codec_index_t codec_index, const pa_a2dp_codec_t **a2dp_codec) {
+    switch (codec_index) {
+        case PA_A2DP_SINK_SBC:
+        case PA_A2DP_SOURCE_SBC:
+            *a2dp_codec = &pa_a2dp_sbc;
+            break;
+        default:
+            *a2dp_codec = NULL;
+    }
+};
+
+void pa_a2dp_a2dp_codec_to_codec_index(const pa_a2dp_codec_t *a2dp_codec, bool is_a2dp_sink,
+                                       pa_a2dp_codec_index_t *codec_index) {
+    if (!a2dp_codec) {
+        *codec_index = PA_A2DP_CODEC_INDEX_UNAVAILABLE;
+        return;
+    }
+    switch (a2dp_codec->codec) {
+        case A2DP_CODEC_SBC:
+            *codec_index = is_a2dp_sink ? PA_A2DP_SINK_SBC : PA_A2DP_SOURCE_SBC;
+            return;
+        case A2DP_CODEC_VENDOR:
+            if (!a2dp_codec->vendor_codec) {
+                *codec_index = PA_A2DP_CODEC_INDEX_UNAVAILABLE;
+                return;
+            }
+            *codec_index = PA_A2DP_CODEC_INDEX_UNAVAILABLE;
+            break;
+        default:
+            *codec_index = PA_A2DP_CODEC_INDEX_UNAVAILABLE;
+    }
+};
+
+void
+pa_a2dp_get_a2dp_codec(uint8_t codec, const a2dp_vendor_codec_t *vendor_codec, const pa_a2dp_codec_t **a2dp_codec) {
+    switch (codec) {
+        case A2DP_CODEC_SBC:
+            *a2dp_codec = &pa_a2dp_sbc;
+            return;
+        case A2DP_CODEC_VENDOR:
+            if (!vendor_codec) {
+                *a2dp_codec = NULL;
+                pa_assert_not_reached();
+            }
+            *a2dp_codec = NULL;
+            break;
+        default:
+            *a2dp_codec = NULL;
+    }
+};
+
+bool pa_a2dp_codec_index_is_sink(pa_a2dp_codec_index_t codec_index) {
+    if (codec_index > PA_A2DP_SINK_MIN && codec_index < PA_A2DP_SINK_MAX)
+        return true;
+    return false;
+};
+
+bool pa_a2dp_codec_index_is_source(pa_a2dp_codec_index_t codec_index) {
+    if (codec_index > PA_A2DP_SOURCE_MIN && codec_index < PA_A2DP_SOURCE_MAX)
+        return true;
+    return false;
+};
+
+bool
+pa_a2dp_select_cap_frequency(uint32_t freq_cap, pa_sample_spec default_sample_spec,
+                             const pa_a2dp_freq_cap_t *freq_cap_table,
+                             size_t n, pa_a2dp_freq_cap_t *result) {
+    int i;
+    /* Find the lowest freq that is at least as high as the requested sampling rate */
+    for (i = 0; (unsigned) i < n; i++)
+        if (freq_cap_table[i].rate >= default_sample_spec.rate && (freq_cap & freq_cap_table[i].cap)) {
+            *result = freq_cap_table[i];
+            break;
+        }
+
+    if ((unsigned) i == n) {
+        for (--i; i >= 0; i--) {
+            if (freq_cap & freq_cap_table[i].cap) {
+                *result = freq_cap_table[i];
+                break;
+            }
+        }
+
+        if (i < 0) {
+            pa_log_error("Not suitable sample rate");
+            return false;
+        }
+    }
+    pa_assert((unsigned) i < n);
+    return true;
+};
diff --git a/src/modules/bluetooth/rtp.h b/src/modules/bluetooth/a2dp/rtp.h
similarity index 100%
rename from src/modules/bluetooth/rtp.h
rename to src/modules/bluetooth/a2dp/rtp.h
diff --git a/src/modules/bluetooth/bluez5-util.c b/src/modules/bluetooth/bluez5-util.c
index 2d8337317..5cc7d7951 100644
--- a/src/modules/bluetooth/bluez5-util.c
+++ b/src/modules/bluetooth/bluez5-util.c
@@ -2,6 +2,7 @@ 
   This file is part of PulseAudio.
 
   Copyright 2008-2013 João Paulo Rechi Vita
+  Copyright 2018      Huang-Huang Bao
 
   PulseAudio is free software; you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as
@@ -33,7 +34,8 @@ 
 #include <pulsecore/refcnt.h>
 #include <pulsecore/shared.h>
 
-#include "a2dp-codecs.h"
+#include "a2dp/a2dp-api.h"
+
 
 #include "bluez5-util.h"
 
@@ -48,8 +50,6 @@ 
 
 #define BLUEZ_ERROR_NOT_SUPPORTED "org.bluez.Error.NotSupported"
 
-#define A2DP_SOURCE_ENDPOINT "/MediaEndpoint/A2DPSource"
-#define A2DP_SINK_ENDPOINT "/MediaEndpoint/A2DPSink"
 
 #define ENDPOINT_INTROSPECT_XML                                         \
     DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                           \
@@ -89,6 +89,8 @@  struct pa_bluetooth_discovery {
     pa_hashmap *devices;
     pa_hashmap *transports;
 
+    pa_a2dp_config_t *a2dp_config;
+
     int headset_backend;
     pa_bluetooth_backend *ofono_backend, *native_backend;
     PA_LLIST_HEAD(pa_dbus_pending, pending);
@@ -888,7 +890,9 @@  finish:
 static void register_endpoint(pa_bluetooth_discovery *y, const char *path, const char *endpoint, const char *uuid) {
     DBusMessage *m;
     DBusMessageIter i, d;
-    uint8_t codec = 0;
+    uint8_t codec;
+    pa_a2dp_codec_index_t index;
+    const pa_a2dp_codec_t *a2dp_codec;
 
     pa_log_debug("Registering %s on adapter %s", endpoint, path);
 
@@ -899,22 +903,23 @@  static void register_endpoint(pa_bluetooth_discovery *y, const char *path, const
     dbus_message_iter_open_container(&i, DBUS_TYPE_ARRAY, DBUS_DICT_ENTRY_BEGIN_CHAR_AS_STRING DBUS_TYPE_STRING_AS_STRING
                                          DBUS_TYPE_VARIANT_AS_STRING DBUS_DICT_ENTRY_END_CHAR_AS_STRING, &d);
     pa_dbus_append_basic_variant_dict_entry(&d, "UUID", DBUS_TYPE_STRING, &uuid);
+
+    pa_a2dp_endpoint_to_codec_index(endpoint, &index);
+    pa_a2dp_codec_index_to_a2dp_codec(index, &a2dp_codec);
+
+    if(!a2dp_codec)
+        return;
+
+    codec = a2dp_codec->codec;
+
     pa_dbus_append_basic_variant_dict_entry(&d, "Codec", DBUS_TYPE_BYTE, &codec);
 
     if (pa_streq(uuid, PA_BLUETOOTH_UUID_A2DP_SOURCE) || pa_streq(uuid, PA_BLUETOOTH_UUID_A2DP_SINK)) {
-        a2dp_sbc_t capabilities;
-
-        capabilities.channel_mode = SBC_CHANNEL_MODE_MONO | SBC_CHANNEL_MODE_DUAL_CHANNEL | SBC_CHANNEL_MODE_STEREO |
-                                    SBC_CHANNEL_MODE_JOINT_STEREO;
-        capabilities.frequency = SBC_SAMPLING_FREQ_16000 | SBC_SAMPLING_FREQ_32000 | SBC_SAMPLING_FREQ_44100 |
-                                 SBC_SAMPLING_FREQ_48000;
-        capabilities.allocation_method = SBC_ALLOCATION_SNR | SBC_ALLOCATION_LOUDNESS;
-        capabilities.subbands = SBC_SUBBANDS_4 | SBC_SUBBANDS_8;
-        capabilities.block_length = SBC_BLOCK_LENGTH_4 | SBC_BLOCK_LENGTH_8 | SBC_BLOCK_LENGTH_12 | SBC_BLOCK_LENGTH_16;
-        capabilities.min_bitpool = MIN_BITPOOL;
-        capabilities.max_bitpool = MAX_BITPOOL;
-
-        pa_dbus_append_basic_array_variant_dict_entry(&d, "Capabilities", DBUS_TYPE_BYTE, &capabilities, sizeof(capabilities));
+        void * capabilities;
+        size_t capabilities_size = a2dp_codec->get_capabilities(&capabilities);
+        pa_dbus_append_basic_array_variant_dict_entry(&d, "Capabilities", DBUS_TYPE_BYTE, capabilities,
+                                                      (unsigned int) capabilities_size);
+        a2dp_codec->free_capabilities(&capabilities);
     }
 
     dbus_message_iter_close_container(&i, &d);
@@ -927,6 +932,9 @@  static void parse_interfaces_and_properties(pa_bluetooth_discovery *y, DBusMessa
     const char *path;
     void *state;
     pa_bluetooth_device *d;
+    pa_a2dp_codec_index_t *index;
+    pa_hashmap *indices;
+    const char *endpoint;
 
     pa_assert(dbus_message_iter_get_arg_type(dict_i) == DBUS_TYPE_OBJECT_PATH);
     dbus_message_iter_get_basic(dict_i, &path);
@@ -964,8 +972,13 @@  static void parse_interfaces_and_properties(pa_bluetooth_discovery *y, DBusMessa
             if (!a->valid)
                 return;
 
-            register_endpoint(y, path, A2DP_SOURCE_ENDPOINT, PA_BLUETOOTH_UUID_A2DP_SOURCE);
-            register_endpoint(y, path, A2DP_SINK_ENDPOINT, PA_BLUETOOTH_UUID_A2DP_SINK);
+            pa_a2dp_get_ordered_indices(&indices, &y->a2dp_config);
+            PA_HASHMAP_FOREACH(index, indices, state) {
+                pa_a2dp_codec_index_to_endpoint(*index, &endpoint);
+                register_endpoint(y, path, endpoint,
+                                  pa_a2dp_codec_index_is_sink(*index) ? PA_BLUETOOTH_UUID_A2DP_SINK
+                                                                      : PA_BLUETOOTH_UUID_A2DP_SOURCE);
+            }
 
         } else if (pa_streq(interface, BLUEZ_DEVICE_INTERFACE)) {
 
@@ -1257,47 +1270,6 @@  fail:
     return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 }
 
-static uint8_t a2dp_default_bitpool(uint8_t freq, uint8_t mode) {
-    /* These bitpool values were chosen based on the A2DP spec recommendation */
-    switch (freq) {
-        case SBC_SAMPLING_FREQ_16000:
-        case SBC_SAMPLING_FREQ_32000:
-            return 53;
-
-        case SBC_SAMPLING_FREQ_44100:
-
-            switch (mode) {
-                case SBC_CHANNEL_MODE_MONO:
-                case SBC_CHANNEL_MODE_DUAL_CHANNEL:
-                    return 31;
-
-                case SBC_CHANNEL_MODE_STEREO:
-                case SBC_CHANNEL_MODE_JOINT_STEREO:
-                    return 53;
-            }
-
-            pa_log_warn("Invalid channel mode %u", mode);
-            return 53;
-
-        case SBC_SAMPLING_FREQ_48000:
-
-            switch (mode) {
-                case SBC_CHANNEL_MODE_MONO:
-                case SBC_CHANNEL_MODE_DUAL_CHANNEL:
-                    return 29;
-
-                case SBC_CHANNEL_MODE_STEREO:
-                case SBC_CHANNEL_MODE_JOINT_STEREO:
-                    return 51;
-            }
-
-            pa_log_warn("Invalid channel mode %u", mode);
-            return 51;
-    }
-
-    pa_log_warn("Invalid sampling freq %u", freq);
-    return 53;
-}
 
 const char *pa_bluetooth_profile_to_string(pa_bluetooth_profile_t profile) {
     switch(profile) {
@@ -1326,6 +1298,18 @@  static DBusMessage *endpoint_set_configuration(DBusConnection *conn, DBusMessage
     pa_bluetooth_profile_t p = PA_BLUETOOTH_PROFILE_OFF;
     DBusMessageIter args, props;
     DBusMessage *r;
+    pa_a2dp_codec_index_t index;
+    const pa_a2dp_codec_t * a2dp_codec;
+    pa_a2dp_sink_t *a2dp_sink = NULL;
+    pa_a2dp_source_t *a2dp_source = NULL;
+
+    endpoint_path = dbus_message_get_path(m);
+
+    pa_a2dp_endpoint_to_codec_index(endpoint_path, &index);
+    pa_a2dp_codec_index_to_a2dp_codec(index, &a2dp_codec);
+
+    if(!a2dp_codec)
+        goto fail2;
 
     if (!dbus_message_iter_init(m, &args) || !pa_streq(dbus_message_get_signature(m), "oa{sv}")) {
         pa_log_error("Invalid signature for method SetConfiguration()");
@@ -1367,13 +1351,14 @@  static DBusMessage *endpoint_set_configuration(DBusConnection *conn, DBusMessage
 
             dbus_message_iter_get_basic(&value, &uuid);
 
-            endpoint_path = dbus_message_get_path(m);
-            if (pa_streq(endpoint_path, A2DP_SOURCE_ENDPOINT)) {
+            if (pa_a2dp_codec_index_is_source(index)) {
                 if (pa_streq(uuid, PA_BLUETOOTH_UUID_A2DP_SOURCE))
                     p = PA_BLUETOOTH_PROFILE_A2DP_SINK;
-            } else if (pa_streq(endpoint_path, A2DP_SINK_ENDPOINT)) {
+                a2dp_source = a2dp_codec->a2dp_source;
+            } else if (pa_a2dp_codec_index_is_sink(index)) {
                 if (pa_streq(uuid, PA_BLUETOOTH_UUID_A2DP_SINK))
                     p = PA_BLUETOOTH_PROFILE_A2DP_SOURCE;
+                a2dp_sink = a2dp_codec->a2dp_sink;
             }
 
             if (p == PA_BLUETOOTH_PROFILE_OFF) {
@@ -1389,7 +1374,6 @@  static DBusMessage *endpoint_set_configuration(DBusConnection *conn, DBusMessage
             dbus_message_iter_get_basic(&value, &dev_path);
         } else if (pa_streq(key, "Configuration")) {
             DBusMessageIter array;
-            a2dp_sbc_t *c;
 
             if (var != DBUS_TYPE_ARRAY) {
                 pa_log_error("Property %s of wrong type %c", key, (char)var);
@@ -1404,40 +1388,9 @@  static DBusMessage *endpoint_set_configuration(DBusConnection *conn, DBusMessage
             }
 
             dbus_message_iter_get_fixed_array(&array, &config, &size);
-            if (size != sizeof(a2dp_sbc_t)) {
-                pa_log_error("Configuration array of invalid size");
-                goto fail;
-            }
 
-            c = (a2dp_sbc_t *) config;
-
-            if (c->frequency != SBC_SAMPLING_FREQ_16000 && c->frequency != SBC_SAMPLING_FREQ_32000 &&
-                c->frequency != SBC_SAMPLING_FREQ_44100 && c->frequency != SBC_SAMPLING_FREQ_48000) {
-                pa_log_error("Invalid sampling frequency in configuration");
+            if(!a2dp_codec->validate_configuration(config, (const size_t) size))
                 goto fail;
-            }
-
-            if (c->channel_mode != SBC_CHANNEL_MODE_MONO && c->channel_mode != SBC_CHANNEL_MODE_DUAL_CHANNEL &&
-                c->channel_mode != SBC_CHANNEL_MODE_STEREO && c->channel_mode != SBC_CHANNEL_MODE_JOINT_STEREO) {
-                pa_log_error("Invalid channel mode in configuration");
-                goto fail;
-            }
-
-            if (c->allocation_method != SBC_ALLOCATION_SNR && c->allocation_method != SBC_ALLOCATION_LOUDNESS) {
-                pa_log_error("Invalid allocation method in configuration");
-                goto fail;
-            }
-
-            if (c->subbands != SBC_SUBBANDS_4 && c->subbands != SBC_SUBBANDS_8) {
-                pa_log_error("Invalid SBC subbands in configuration");
-                goto fail;
-            }
-
-            if (c->block_length != SBC_BLOCK_LENGTH_4 && c->block_length != SBC_BLOCK_LENGTH_8 &&
-                c->block_length != SBC_BLOCK_LENGTH_12 && c->block_length != SBC_BLOCK_LENGTH_16) {
-                pa_log_error("Invalid block length in configuration");
-                goto fail;
-            }
         }
 
         dbus_message_iter_next(&props);
@@ -1459,6 +1412,11 @@  static DBusMessage *endpoint_set_configuration(DBusConnection *conn, DBusMessage
         goto fail2;
     }
 
+    if(!a2dp_sink && !a2dp_source){
+        pa_log_error("No a2dp_sink or a2dp_source available for endpoint %s", endpoint_path);
+        goto fail2;
+    }
+
     sender = dbus_message_get_sender(m);
 
     pa_assert_se(r = dbus_message_new_method_return(m));
@@ -1468,6 +1426,10 @@  static DBusMessage *endpoint_set_configuration(DBusConnection *conn, DBusMessage
     t = pa_bluetooth_transport_new(d, sender, path, p, config, size);
     t->acquire = bluez5_transport_acquire_cb;
     t->release = bluez5_transport_release_cb;
+    t->codec = a2dp_codec->codec;
+    t->a2dp_codec = a2dp_codec;
+    t->a2dp_sink = a2dp_sink;
+    t->a2dp_source = a2dp_source;
     pa_bluetooth_transport_put(t);
 
     pa_log_debug("Transport %s available for profile %s", t->path, pa_bluetooth_profile_to_string(t->profile));
@@ -1484,22 +1446,15 @@  fail2:
 
 static DBusMessage *endpoint_select_configuration(DBusConnection *conn, DBusMessage *m, void *userdata) {
     pa_bluetooth_discovery *y = userdata;
-    a2dp_sbc_t *cap, config;
-    uint8_t *pconf = (uint8_t *) &config;
-    int i, size;
+    void *cap, *pconf;
+    int size,config_size;
     DBusMessage *r;
     DBusError err;
+    pa_a2dp_codec_index_t index;
+    const pa_a2dp_codec_t *a2dp_codec;
+    const char * endpoint = dbus_message_get_path(m);
 
-    static const struct {
-        uint32_t rate;
-        uint8_t cap;
-    } freq_table[] = {
-        { 16000U, SBC_SAMPLING_FREQ_16000 },
-        { 32000U, SBC_SAMPLING_FREQ_32000 },
-        { 44100U, SBC_SAMPLING_FREQ_44100 },
-        { 48000U, SBC_SAMPLING_FREQ_48000 }
-    };
-
+    pa_log_debug("selecing configuration");
     dbus_error_init(&err);
 
     if (!dbus_message_get_args(m, &err, DBUS_TYPE_ARRAY, DBUS_TYPE_BYTE, &cap, &size, DBUS_TYPE_INVALID)) {
@@ -1508,102 +1463,22 @@  static DBusMessage *endpoint_select_configuration(DBusConnection *conn, DBusMess
         goto fail;
     }
 
-    if (size != sizeof(config)) {
-        pa_log_error("Capabilities array has invalid size");
-        goto fail;
-    }
-
-    pa_zero(config);
-
-    /* Find the lowest freq that is at least as high as the requested sampling rate */
-    for (i = 0; (unsigned) i < PA_ELEMENTSOF(freq_table); i++)
-        if (freq_table[i].rate >= y->core->default_sample_spec.rate && (cap->frequency & freq_table[i].cap)) {
-            config.frequency = freq_table[i].cap;
-            break;
-        }
-
-    if ((unsigned) i == PA_ELEMENTSOF(freq_table)) {
-        for (--i; i >= 0; i--) {
-            if (cap->frequency & freq_table[i].cap) {
-                config.frequency = freq_table[i].cap;
-                break;
-            }
-        }
-
-        if (i < 0) {
-            pa_log_error("Not suitable sample rate");
-            goto fail;
-        }
-    }
-
-    pa_assert((unsigned) i < PA_ELEMENTSOF(freq_table));
-
-    if (y->core->default_sample_spec.channels <= 1) {
-        if (cap->channel_mode & SBC_CHANNEL_MODE_MONO)
-            config.channel_mode = SBC_CHANNEL_MODE_MONO;
-        else if (cap->channel_mode & SBC_CHANNEL_MODE_JOINT_STEREO)
-            config.channel_mode = SBC_CHANNEL_MODE_JOINT_STEREO;
-        else if (cap->channel_mode & SBC_CHANNEL_MODE_STEREO)
-            config.channel_mode = SBC_CHANNEL_MODE_STEREO;
-        else if (cap->channel_mode & SBC_CHANNEL_MODE_DUAL_CHANNEL)
-            config.channel_mode = SBC_CHANNEL_MODE_DUAL_CHANNEL;
-        else {
-            pa_log_error("No supported channel modes");
-            goto fail;
-        }
-    }
-
-    if (y->core->default_sample_spec.channels >= 2) {
-        if (cap->channel_mode & SBC_CHANNEL_MODE_JOINT_STEREO)
-            config.channel_mode = SBC_CHANNEL_MODE_JOINT_STEREO;
-        else if (cap->channel_mode & SBC_CHANNEL_MODE_STEREO)
-            config.channel_mode = SBC_CHANNEL_MODE_STEREO;
-        else if (cap->channel_mode & SBC_CHANNEL_MODE_DUAL_CHANNEL)
-            config.channel_mode = SBC_CHANNEL_MODE_DUAL_CHANNEL;
-        else if (cap->channel_mode & SBC_CHANNEL_MODE_MONO)
-            config.channel_mode = SBC_CHANNEL_MODE_MONO;
-        else {
-            pa_log_error("No supported channel modes");
-            goto fail;
-        }
-    }
+    pa_a2dp_endpoint_to_codec_index(endpoint, &index);
+    pa_a2dp_codec_index_to_a2dp_codec(index, &a2dp_codec);
 
-    if (cap->block_length & SBC_BLOCK_LENGTH_16)
-        config.block_length = SBC_BLOCK_LENGTH_16;
-    else if (cap->block_length & SBC_BLOCK_LENGTH_12)
-        config.block_length = SBC_BLOCK_LENGTH_12;
-    else if (cap->block_length & SBC_BLOCK_LENGTH_8)
-        config.block_length = SBC_BLOCK_LENGTH_8;
-    else if (cap->block_length & SBC_BLOCK_LENGTH_4)
-        config.block_length = SBC_BLOCK_LENGTH_4;
-    else {
-        pa_log_error("No supported block lengths");
+    if(!a2dp_codec)
         goto fail;
-    }
 
-    if (cap->subbands & SBC_SUBBANDS_8)
-        config.subbands = SBC_SUBBANDS_8;
-    else if (cap->subbands & SBC_SUBBANDS_4)
-        config.subbands = SBC_SUBBANDS_4;
-    else {
-        pa_log_error("No supported subbands");
+    config_size = (int) a2dp_codec->select_configuration(y->core->default_sample_spec, cap, (const size_t) size, &pconf);
+    if (size != config_size) {
+        pa_log_error("Capabilities array has invalid size %d, %d",size, config_size);
         goto fail;
     }
 
-    if (cap->allocation_method & SBC_ALLOCATION_LOUDNESS)
-        config.allocation_method = SBC_ALLOCATION_LOUDNESS;
-    else if (cap->allocation_method & SBC_ALLOCATION_SNR)
-        config.allocation_method = SBC_ALLOCATION_SNR;
-
-    config.min_bitpool = (uint8_t) PA_MAX(MIN_BITPOOL, cap->min_bitpool);
-    config.max_bitpool = (uint8_t) PA_MIN(a2dp_default_bitpool(config.frequency, config.channel_mode), cap->max_bitpool);
-
-    if (config.min_bitpool > config.max_bitpool)
-        goto fail;
-
     pa_assert_se(r = dbus_message_new_method_return(m));
     pa_assert_se(dbus_message_append_args(r, DBUS_TYPE_ARRAY, DBUS_TYPE_BYTE, &pconf, size, DBUS_TYPE_INVALID));
 
+    a2dp_codec->free_configuration(&pconf);
     return r;
 
 fail:
@@ -1668,6 +1543,7 @@  static DBusHandlerResult endpoint_handler(DBusConnection *c, DBusMessage *m, voi
     struct pa_bluetooth_discovery *y = userdata;
     DBusMessage *r = NULL;
     const char *path, *interface, *member;
+    pa_a2dp_codec_index_t index;
 
     pa_assert(y);
 
@@ -1677,7 +1553,8 @@  static DBusHandlerResult endpoint_handler(DBusConnection *c, DBusMessage *m, voi
 
     pa_log_debug("dbus: path=%s, interface=%s, member=%s", path, interface, member);
 
-    if (!pa_streq(path, A2DP_SOURCE_ENDPOINT) && !pa_streq(path, A2DP_SINK_ENDPOINT))
+    pa_a2dp_endpoint_to_codec_index(path, &index);
+    if (index == PA_A2DP_CODEC_INDEX_UNAVAILABLE)
         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 
     if (dbus_message_is_method_call(m, "org.freedesktop.DBus.Introspectable", "Introspect")) {
@@ -1706,6 +1583,10 @@  static DBusHandlerResult endpoint_handler(DBusConnection *c, DBusMessage *m, voi
 }
 
 static void endpoint_init(pa_bluetooth_discovery *y, pa_bluetooth_profile_t profile) {
+    void *state;
+    pa_a2dp_codec_index_t *index;
+    pa_hashmap *indices;
+    const char *endpoint;
     static const DBusObjectPathVTable vtable_endpoint = {
         .message_function = endpoint_handler,
     };
@@ -1714,33 +1595,49 @@  static void endpoint_init(pa_bluetooth_discovery *y, pa_bluetooth_profile_t prof
 
     switch(profile) {
         case PA_BLUETOOTH_PROFILE_A2DP_SINK:
-            pa_assert_se(dbus_connection_register_object_path(pa_dbus_connection_get(y->connection), A2DP_SOURCE_ENDPOINT,
-                                                              &vtable_endpoint, y));
+            pa_a2dp_get_source_indices(&indices, &y->a2dp_config);
             break;
         case PA_BLUETOOTH_PROFILE_A2DP_SOURCE:
-            pa_assert_se(dbus_connection_register_object_path(pa_dbus_connection_get(y->connection), A2DP_SINK_ENDPOINT,
-                                                              &vtable_endpoint, y));
+            pa_a2dp_get_sink_indices(&indices, &y->a2dp_config);
             break;
         default:
             pa_assert_not_reached();
             break;
     }
+
+    PA_HASHMAP_FOREACH(index, indices, state){
+        pa_a2dp_codec_index_to_endpoint(*index, &endpoint);
+        if(!endpoint)
+            continue;
+        pa_assert_se(dbus_connection_register_object_path(pa_dbus_connection_get(y->connection), endpoint,
+                                                          &vtable_endpoint, y));
+    }
 }
 
 static void endpoint_done(pa_bluetooth_discovery *y, pa_bluetooth_profile_t profile) {
+    void *state;
+    pa_a2dp_codec_index_t *index;
+    pa_hashmap *indices;
+    const char *endpoint;
+
     pa_assert(y);
 
     switch(profile) {
         case PA_BLUETOOTH_PROFILE_A2DP_SINK:
-            dbus_connection_unregister_object_path(pa_dbus_connection_get(y->connection), A2DP_SOURCE_ENDPOINT);
+            pa_a2dp_get_source_indices(&indices, &y->a2dp_config);
             break;
         case PA_BLUETOOTH_PROFILE_A2DP_SOURCE:
-            dbus_connection_unregister_object_path(pa_dbus_connection_get(y->connection), A2DP_SINK_ENDPOINT);
+            pa_a2dp_get_sink_indices(&indices, &y->a2dp_config);
             break;
         default:
             pa_assert_not_reached();
             break;
     }
+
+    PA_HASHMAP_FOREACH(index,indices,state){
+        pa_a2dp_codec_index_to_endpoint(*index, &endpoint);
+        dbus_connection_unregister_object_path(pa_dbus_connection_get(y->connection), endpoint);
+    }
 }
 
 pa_bluetooth_discovery* pa_bluetooth_discovery_get(pa_core *c, int headset_backend) {
@@ -1760,6 +1657,8 @@  pa_bluetooth_discovery* pa_bluetooth_discovery_get(pa_core *c, int headset_backe
     y->transports = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
     PA_LLIST_HEAD_INIT(pa_dbus_pending, y->pending);
 
+    pa_a2dp_init(&y->a2dp_config);
+
     for (i = 0; i < PA_BLUETOOTH_HOOK_MAX; i++)
         pa_hook_init(&y->hooks[i], y);
 
@@ -1871,6 +1770,9 @@  void pa_bluetooth_discovery_unref(pa_bluetooth_discovery *y) {
         endpoint_done(y, PA_BLUETOOTH_PROFILE_A2DP_SINK);
         endpoint_done(y, PA_BLUETOOTH_PROFILE_A2DP_SOURCE);
 
+        if(y->a2dp_config)
+            pa_a2dp_free(&y->a2dp_config);
+
         pa_dbus_connection_unref(y->connection);
     }
 
diff --git a/src/modules/bluetooth/bluez5-util.h b/src/modules/bluetooth/bluez5-util.h
index ad30708f0..c8e4b6220 100644
--- a/src/modules/bluetooth/bluez5-util.h
+++ b/src/modules/bluetooth/bluez5-util.h
@@ -5,6 +5,7 @@ 
   This file is part of PulseAudio.
 
   Copyright 2008-2013 João Paulo Rechi Vita
+  Copyright 2018      Huang-Huang Bao
 
   PulseAudio is free software; you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as
@@ -22,6 +23,8 @@ 
 
 #include <pulsecore/core.h>
 
+#include "a2dp/a2dp-api.h"
+
 #define PA_BLUETOOTH_UUID_A2DP_SOURCE "0000110a-0000-1000-8000-00805f9b34fb"
 #define PA_BLUETOOTH_UUID_A2DP_SINK   "0000110b-0000-1000-8000-00805f9b34fb"
 
@@ -78,6 +81,10 @@  struct pa_bluetooth_transport {
     char *path;
     pa_bluetooth_profile_t profile;
 
+    const pa_a2dp_codec_t *a2dp_codec;
+    pa_a2dp_sink_t *a2dp_sink;
+    pa_a2dp_source_t *a2dp_source;
+
     uint8_t codec;
     uint8_t *config;
     size_t config_size;
diff --git a/src/modules/bluetooth/module-bluez5-device.c b/src/modules/bluetooth/module-bluez5-device.c
index d983efdec..207db1623 100644
--- a/src/modules/bluetooth/module-bluez5-device.c
+++ b/src/modules/bluetooth/module-bluez5-device.c
@@ -3,6 +3,7 @@ 
 
   Copyright 2008-2013 João Paulo Rechi Vita
   Copyright 2011-2013 BMW Car IT GmbH.
+  Copyright 2018      Huang-Huang Bao
 
   PulseAudio is free software; you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as
@@ -46,9 +47,8 @@ 
 #include <pulsecore/thread-mq.h>
 #include <pulsecore/time-smoother.h>
 
-#include "a2dp-codecs.h"
+#include "a2dp/a2dp-api.h"
 #include "bluez5-util.h"
-#include "rtp.h"
 
 PA_MODULE_AUTHOR("João Paulo Rechi Vita");
 PA_MODULE_DESCRIPTION("BlueZ 5 Bluetooth audio sink and source");
@@ -62,13 +62,12 @@  PA_MODULE_USAGE("path=<device object path>"
 #define FIXED_LATENCY_RECORD_A2DP   (25 * PA_USEC_PER_MSEC)
 #define FIXED_LATENCY_RECORD_SCO    (25 * PA_USEC_PER_MSEC)
 
-#define BITPOOL_DEC_LIMIT 32
-#define BITPOOL_DEC_STEP 5
 #define HSP_MAX_GAIN 15
 
 static const char* const valid_modargs[] = {
     "path",
     "autodetect_mtu",
+    "a2dp_config",
     NULL
 };
 
@@ -94,17 +93,13 @@  typedef struct bluetooth_msg {
 PA_DEFINE_PRIVATE_CLASS(bluetooth_msg, pa_msgobject);
 #define BLUETOOTH_MSG(o) (bluetooth_msg_cast(o))
 
-typedef struct sbc_info {
-    sbc_t sbc;                           /* Codec data */
-    bool sbc_initialized;                /* Keep track if the encoder is initialized */
-    size_t codesize, frame_length;       /* SBC Codesize, frame_length. We simply cache those values here */
-    uint16_t seq_num;                    /* Cumulative packet sequence */
-    uint8_t min_bitpool;
-    uint8_t max_bitpool;
-
-    void* buffer;                        /* Codec transfer buffer */
-    size_t buffer_size;                  /* Size of the buffer */
-} sbc_info_t;
+typedef struct pa_a2dp_info {
+    pa_proplist *a2dp_config;
+    void *a2dp_sink_data;
+    void *a2dp_source_data;
+    void *buffer;
+    size_t buffer_size;
+} pa_a2dp_info_t;
 
 struct userdata {
     pa_module *module;
@@ -146,7 +141,7 @@  struct userdata {
     pa_smoother *read_smoother;
     pa_memchunk write_memchunk;
     pa_sample_spec sample_spec;
-    struct sbc_info sbc_info;
+    pa_a2dp_info_t a2dp_info;
 };
 
 typedef enum pa_bluetooth_form_factor {
@@ -418,105 +413,55 @@  static void a2dp_prepare_buffer(struct userdata *u) {
 
     pa_assert(u);
 
-    if (u->sbc_info.buffer_size >= min_buffer_size)
+    if (u->a2dp_info.buffer_size >= min_buffer_size)
         return;
 
-    u->sbc_info.buffer_size = 2 * min_buffer_size;
-    pa_xfree(u->sbc_info.buffer);
-    u->sbc_info.buffer = pa_xmalloc(u->sbc_info.buffer_size);
+    u->a2dp_info.buffer_size = 2 * min_buffer_size;
+    pa_xfree(u->a2dp_info.buffer);
+    u->a2dp_info.buffer = pa_xmalloc(u->a2dp_info.buffer_size);
+}
+
+static void a2dp_encoder_buffer_read_cb(const void **read_buf, size_t read_buf_size, void *userdata) {
+    struct userdata *u = (struct userdata *) userdata;
+    if (!u->write_memchunk.memblock)
+        pa_sink_render_full(u->sink, read_buf_size, &u->write_memchunk);
+    pa_assert(u->write_memchunk.length == read_buf_size);
+    *read_buf = (const uint8_t *) pa_memblock_acquire_chunk(&u->write_memchunk);
+}
+
+static void a2dp_encoder_buffer_free_cb(const void **read_buf, void *userdata) {
+    struct userdata *u = (struct userdata *) userdata;
+    if (!read_buf)
+        return;;
+    pa_memblock_release(u->write_memchunk.memblock);
+    pa_memblock_unref(u->write_memchunk.memblock);
+    pa_memchunk_reset(&u->write_memchunk);
+    *read_buf = NULL;
 }
 
 /* Run from IO thread */
 static int a2dp_process_render(struct userdata *u) {
-    struct sbc_info *sbc_info;
-    struct rtp_header *header;
-    struct rtp_payload *payload;
-    size_t nbytes;
-    void *d;
-    const void *p;
-    size_t to_write, to_encode;
-    unsigned frame_count;
+    size_t nbytes, encoded;
     int ret = 0;
 
     pa_assert(u);
     pa_assert(u->profile == PA_BLUETOOTH_PROFILE_A2DP_SINK);
     pa_assert(u->sink);
-
-    /* First, render some data */
-    if (!u->write_memchunk.memblock)
-        pa_sink_render_full(u->sink, u->write_block_size, &u->write_memchunk);
-
-    pa_assert(u->write_memchunk.length == u->write_block_size);
+    pa_assert(u->transport);
+    pa_assert(u->transport->a2dp_source);
 
     a2dp_prepare_buffer(u);
 
-    sbc_info = &u->sbc_info;
-    header = sbc_info->buffer;
-    payload = (struct rtp_payload*) ((uint8_t*) sbc_info->buffer + sizeof(*header));
-
-    frame_count = 0;
-
-    /* Try to create a packet of the full MTU */
-
-    p = (const uint8_t *) pa_memblock_acquire_chunk(&u->write_memchunk);
-    to_encode = u->write_memchunk.length;
-
-    d = (uint8_t*) sbc_info->buffer + sizeof(*header) + sizeof(*payload);
-    to_write = sbc_info->buffer_size - sizeof(*header) - sizeof(*payload);
-
-    while (PA_LIKELY(to_encode > 0 && to_write > 0)) {
-        ssize_t written;
-        ssize_t encoded;
-
-        encoded = sbc_encode(&sbc_info->sbc,
-                             p, to_encode,
-                             d, to_write,
-                             &written);
-
-        if (PA_UNLIKELY(encoded <= 0)) {
-            pa_log_error("SBC encoding error (%li)", (long) encoded);
-            pa_memblock_release(u->write_memchunk.memblock);
-            return -1;
-        }
-
-        pa_assert_fp((size_t) encoded <= to_encode);
-        pa_assert_fp((size_t) encoded == sbc_info->codesize);
-
-        pa_assert_fp((size_t) written <= to_write);
-        pa_assert_fp((size_t) written == sbc_info->frame_length);
-
-        p = (const uint8_t*) p + encoded;
-        to_encode -= encoded;
-
-        d = (uint8_t*) d + written;
-        to_write -= written;
-
-        frame_count++;
-    }
-
-    pa_memblock_release(u->write_memchunk.memblock);
-
-    pa_assert(to_encode == 0);
-
-    PA_ONCE_BEGIN {
-        pa_log_debug("Using SBC encoder implementation: %s", pa_strnull(sbc_get_implementation_info(&sbc_info->sbc)));
-    } PA_ONCE_END;
-
-    /* write it to the fifo */
-    memset(sbc_info->buffer, 0, sizeof(*header) + sizeof(*payload));
-    header->v = 2;
-    header->pt = 1;
-    header->sequence_number = htons(sbc_info->seq_num++);
-    header->timestamp = htonl(u->write_index / pa_frame_size(&u->sample_spec));
-    header->ssrc = htonl(1);
-    payload->frame_count = frame_count;
-
-    nbytes = (uint8_t*) d - (uint8_t*) sbc_info->buffer;
+    nbytes = u->transport->a2dp_source->encode((uint32_t) (u->write_index / pa_frame_size(&u->sample_spec)),
+                                               u->a2dp_info.buffer, u->a2dp_info.buffer_size,
+                                               &encoded, u, &u->a2dp_info.a2dp_source_data);
+    if(nbytes == 0)
+        return -1;
 
     for (;;) {
         ssize_t l;
 
-        l = pa_write(u->stream_fd, sbc_info->buffer, nbytes, &u->stream_write_type);
+        l = pa_write(u->stream_fd, u->a2dp_info.buffer, nbytes, &u->stream_write_type);
 
         pa_assert(l != 0);
 
@@ -547,9 +492,7 @@  static int a2dp_process_render(struct userdata *u) {
             break;
         }
 
-        u->write_index += (uint64_t) u->write_memchunk.length;
-        pa_memblock_unref(u->write_memchunk.memblock);
-        pa_memchunk_reset(&u->write_memchunk);
+        u->write_index += encoded;
 
         ret = 1;
 
@@ -568,6 +511,8 @@  static int a2dp_process_push(struct userdata *u) {
     pa_assert(u->profile == PA_BLUETOOTH_PROFILE_A2DP_SOURCE);
     pa_assert(u->source);
     pa_assert(u->read_smoother);
+    pa_assert(u->transport);
+    pa_assert(u->transport->a2dp_sink);
 
     memchunk.memblock = pa_memblock_new(u->core->mempool, u->read_block_size);
     memchunk.index = memchunk.length = 0;
@@ -575,22 +520,18 @@  static int a2dp_process_push(struct userdata *u) {
     for (;;) {
         bool found_tstamp = false;
         pa_usec_t tstamp;
-        struct sbc_info *sbc_info;
-        struct rtp_header *header;
-        struct rtp_payload *payload;
-        const void *p;
+        pa_a2dp_info_t *a2dp_info;
         void *d;
         ssize_t l;
-        size_t to_write, to_decode;
+        size_t decoded;
         size_t total_written = 0;
+        uint32_t timestamp;
 
         a2dp_prepare_buffer(u);
 
-        sbc_info = &u->sbc_info;
-        header = sbc_info->buffer;
-        payload = (struct rtp_payload*) ((uint8_t*) sbc_info->buffer + sizeof(*header));
+        a2dp_info = &u->a2dp_info;
 
-        l = pa_read(u->stream_fd, sbc_info->buffer, sbc_info->buffer_size, &u->stream_write_type);
+        l = pa_read(u->stream_fd, a2dp_info->buffer, a2dp_info->buffer_size, &u->stream_write_type);
 
         if (l <= 0) {
 
@@ -607,7 +548,7 @@  static int a2dp_process_push(struct userdata *u) {
             break;
         }
 
-        pa_assert((size_t) l <= sbc_info->buffer_size);
+        pa_assert((size_t) l <= a2dp_info->buffer_size);
 
         /* TODO: get timestamp from rtp */
         if (!found_tstamp) {
@@ -615,50 +556,22 @@  static int a2dp_process_push(struct userdata *u) {
             tstamp = pa_rtclock_now();
         }
 
-        p = (uint8_t*) sbc_info->buffer + sizeof(*header) + sizeof(*payload);
-        to_decode = l - sizeof(*header) - sizeof(*payload);
-
         d = pa_memblock_acquire(memchunk.memblock);
-        to_write = memchunk.length = pa_memblock_get_length(memchunk.memblock);
-
-        while (PA_LIKELY(to_decode > 0)) {
-            size_t written;
-            ssize_t decoded;
-
-            decoded = sbc_decode(&sbc_info->sbc,
-                                 p, to_decode,
-                                 d, to_write,
-                                 &written);
-
-            if (PA_UNLIKELY(decoded <= 0)) {
-                pa_log_error("SBC decoding error (%li)", (long) decoded);
-                pa_memblock_release(memchunk.memblock);
-                pa_memblock_unref(memchunk.memblock);
-                return 0;
-            }
+        memchunk.length = pa_memblock_get_length(memchunk.memblock);
 
-            total_written += written;
-
-            /* Reset frame length, it can be changed due to bitpool change */
-            sbc_info->frame_length = sbc_get_frame_length(&sbc_info->sbc);
-
-            pa_assert_fp((size_t) decoded <= to_decode);
-            pa_assert_fp((size_t) decoded == sbc_info->frame_length);
-
-            pa_assert_fp((size_t) written == sbc_info->codesize);
-
-            p = (const uint8_t*) p + decoded;
-            to_decode -= decoded;
-
-            d = (uint8_t*) d + written;
-            to_write -= written;
+        total_written = u->transport->a2dp_sink->decode(a2dp_info->buffer, (size_t) l, d, memchunk.length, &decoded,
+                                                        &timestamp, &a2dp_info->a2dp_sink_data);
+        if(total_written == 0){
+            pa_memblock_release(memchunk.memblock);
+            pa_memblock_unref(memchunk.memblock);
+            return 0;
         }
 
         u->read_index += (uint64_t) total_written;
         pa_smoother_put(u->read_smoother, tstamp, pa_bytes_to_usec(u->read_index, &u->sample_spec));
         pa_smoother_resume(u->read_smoother, tstamp, true);
 
-        memchunk.length -= to_write;
+        memchunk.length = total_written;
 
         pa_memblock_release(memchunk.memblock);
 
@@ -705,40 +618,10 @@  static void update_buffer_size(struct userdata *u) {
     }
 }
 
-/* Run from I/O thread */
-static void a2dp_set_bitpool(struct userdata *u, uint8_t bitpool) {
-    struct sbc_info *sbc_info;
-
-    pa_assert(u);
-
-    sbc_info = &u->sbc_info;
-
-    if (sbc_info->sbc.bitpool == bitpool)
-        return;
-
-    if (bitpool > sbc_info->max_bitpool)
-        bitpool = sbc_info->max_bitpool;
-    else if (bitpool < sbc_info->min_bitpool)
-        bitpool = sbc_info->min_bitpool;
-
-    sbc_info->sbc.bitpool = bitpool;
-
-    sbc_info->codesize = sbc_get_codesize(&sbc_info->sbc);
-    sbc_info->frame_length = sbc_get_frame_length(&sbc_info->sbc);
-
-    pa_log_debug("Bitpool has changed to %u", sbc_info->sbc.bitpool);
-
-    u->read_block_size =
-        (u->read_link_mtu - sizeof(struct rtp_header) - sizeof(struct rtp_payload))
-        / sbc_info->frame_length * sbc_info->codesize;
-
-    u->write_block_size =
-        (u->write_link_mtu - sizeof(struct rtp_header) - sizeof(struct rtp_payload))
-        / sbc_info->frame_length * sbc_info->codesize;
-
+static void a2dp_set_sink(struct userdata *u){
     pa_sink_set_max_request_within_thread(u->sink, u->write_block_size);
     pa_sink_set_fixed_latency_within_thread(u->sink,
-            FIXED_LATENCY_PLAYBACK_A2DP + pa_bytes_to_usec(u->write_block_size, &u->sample_spec));
+                                            FIXED_LATENCY_PLAYBACK_A2DP + pa_bytes_to_usec(u->write_block_size, &u->sample_spec));
 
     /* If there is still data in the memchunk, we have to discard it
      * because the write_block_size may have changed. */
@@ -750,27 +633,6 @@  static void a2dp_set_bitpool(struct userdata *u, uint8_t bitpool) {
     update_buffer_size(u);
 }
 
-/* Run from I/O thread */
-static void a2dp_reduce_bitpool(struct userdata *u) {
-    struct sbc_info *sbc_info;
-    uint8_t bitpool;
-
-    pa_assert(u);
-
-    sbc_info = &u->sbc_info;
-
-    /* Check if bitpool is already at its limit */
-    if (sbc_info->sbc.bitpool <= BITPOOL_DEC_LIMIT)
-        return;
-
-    bitpool = sbc_info->sbc.bitpool - BITPOOL_DEC_STEP;
-
-    if (bitpool < BITPOOL_DEC_LIMIT)
-        bitpool = BITPOOL_DEC_LIMIT;
-
-    a2dp_set_bitpool(u, bitpool);
-}
-
 static void teardown_stream(struct userdata *u) {
     if (u->rtpoll_item) {
         pa_rtpoll_item_free(u->rtpoll_item);
@@ -860,13 +722,15 @@  static void transport_config_mtu(struct userdata *u) {
             u->write_block_size = pa_frame_align(u->write_block_size, &u->sink->sample_spec);
         }
     } else {
-        u->read_block_size =
-            (u->read_link_mtu - sizeof(struct rtp_header) - sizeof(struct rtp_payload))
-            / u->sbc_info.frame_length * u->sbc_info.codesize;
-
-        u->write_block_size =
-            (u->write_link_mtu - sizeof(struct rtp_header) - sizeof(struct rtp_payload))
-            / u->sbc_info.frame_length * u->sbc_info.codesize;
+        u->read_block_size = u->read_link_mtu;
+        u->write_block_size = u->write_link_mtu;
+        if (u->transport->a2dp_sink)
+            u->transport->a2dp_sink->get_block_size(u->read_link_mtu, &u->read_block_size, &u->a2dp_info.a2dp_sink_data);
+        else if (u->transport->a2dp_source)
+            u->transport->a2dp_source->get_block_size(u->write_link_mtu, &u->write_block_size,
+                                                      &u->a2dp_info.a2dp_source_data);
+        else
+            pa_assert_not_reached();
     }
 
     if (u->sink) {
@@ -906,9 +770,19 @@  static void setup_stream(struct userdata *u) {
 
     pa_log_debug("Stream properly set up, we're ready to roll!");
 
-    if (u->profile == PA_BLUETOOTH_PROFILE_A2DP_SINK) {
-        a2dp_set_bitpool(u, u->sbc_info.max_bitpool);
-        update_buffer_size(u);
+    if (u->transport->a2dp_sink) {
+        u->transport->a2dp_sink->setup_stream(&u->a2dp_info.a2dp_sink_data);
+        u->transport->a2dp_sink->get_block_size(u->read_link_mtu, &u->read_block_size,
+                                                &u->a2dp_info.a2dp_sink_data);
+        pa_proplist_sets(u->source->proplist, "bluetooth.a2dp_codec", u->transport->a2dp_codec->name);
+
+    } else if (u->transport->a2dp_source) {
+        u->transport->a2dp_source->setup_stream(&u->a2dp_info.a2dp_source_data);
+        u->transport->a2dp_source->get_block_size(u->write_link_mtu, &u->write_block_size,
+                                                  &u->a2dp_info.a2dp_source_data);
+        a2dp_set_sink(u);
+        pa_proplist_sets(u->sink->proplist, "bluetooth.a2dp_codec", u->transport->a2dp_codec->name);
+
     }
 
     u->rtpoll_item = pa_rtpoll_item_new(u->rtpoll, PA_RTPOLL_NEVER, 1);
@@ -1095,6 +969,8 @@  static int add_source(struct userdata *u) {
                 pa_assert_not_reached();
                 break;
         }
+    else if(u->transport->a2dp_codec && u->transport->a2dp_sink)
+        pa_proplist_sets(data.proplist, "bluetooth.a2dp_codec", u->transport->a2dp_codec->name);
 
     u->source = pa_source_new(u->core, &data, PA_SOURCE_HARDWARE|PA_SOURCE_LATENCY);
     pa_source_new_data_done(&data);
@@ -1270,6 +1146,9 @@  static int add_sink(struct userdata *u) {
                 pa_assert_not_reached();
                 break;
         }
+    else if(u->transport->a2dp_codec && u->transport->a2dp_source)
+        pa_proplist_sets(data.proplist, "bluetooth.a2dp_codec", u->transport->a2dp_codec->name);
+
 
     u->sink = pa_sink_new(u->core, &data, PA_SINK_HARDWARE|PA_SINK_LATENCY);
     pa_sink_new_data_done(&data);
@@ -1296,111 +1175,39 @@  static void transport_config(struct userdata *u) {
         u->sample_spec.channels = 1;
         u->sample_spec.rate = 8000;
     } else {
-        sbc_info_t *sbc_info = &u->sbc_info;
-        a2dp_sbc_t *config;
-
+        pa_proplist *user_config = NULL;
         pa_assert(u->transport);
 
-        u->sample_spec.format = PA_SAMPLE_S16LE;
-        config = (a2dp_sbc_t *) u->transport->config;
-
-        if (sbc_info->sbc_initialized)
-            sbc_reinit(&sbc_info->sbc, 0);
-        else
-            sbc_init(&sbc_info->sbc, 0);
-        sbc_info->sbc_initialized = true;
-
-        switch (config->frequency) {
-            case SBC_SAMPLING_FREQ_16000:
-                sbc_info->sbc.frequency = SBC_FREQ_16000;
-                u->sample_spec.rate = 16000U;
-                break;
-            case SBC_SAMPLING_FREQ_32000:
-                sbc_info->sbc.frequency = SBC_FREQ_32000;
-                u->sample_spec.rate = 32000U;
-                break;
-            case SBC_SAMPLING_FREQ_44100:
-                sbc_info->sbc.frequency = SBC_FREQ_44100;
-                u->sample_spec.rate = 44100U;
-                break;
-            case SBC_SAMPLING_FREQ_48000:
-                sbc_info->sbc.frequency = SBC_FREQ_48000;
-                u->sample_spec.rate = 48000U;
-                break;
-            default:
-                pa_assert_not_reached();
-        }
-
-        switch (config->channel_mode) {
-            case SBC_CHANNEL_MODE_MONO:
-                sbc_info->sbc.mode = SBC_MODE_MONO;
-                u->sample_spec.channels = 1;
-                break;
-            case SBC_CHANNEL_MODE_DUAL_CHANNEL:
-                sbc_info->sbc.mode = SBC_MODE_DUAL_CHANNEL;
-                u->sample_spec.channels = 2;
-                break;
-            case SBC_CHANNEL_MODE_STEREO:
-                sbc_info->sbc.mode = SBC_MODE_STEREO;
-                u->sample_spec.channels = 2;
-                break;
-            case SBC_CHANNEL_MODE_JOINT_STEREO:
-                sbc_info->sbc.mode = SBC_MODE_JOINT_STEREO;
-                u->sample_spec.channels = 2;
-                break;
-            default:
-                pa_assert_not_reached();
-        }
+        if (u->a2dp_info.a2dp_config)
+            user_config = pa_proplist_copy(u->a2dp_info.a2dp_config);
 
-        switch (config->allocation_method) {
-            case SBC_ALLOCATION_SNR:
-                sbc_info->sbc.allocation = SBC_AM_SNR;
-                break;
-            case SBC_ALLOCATION_LOUDNESS:
-                sbc_info->sbc.allocation = SBC_AM_LOUDNESS;
-                break;
-            default:
-                pa_assert_not_reached();
-        }
+        if (u->transport->a2dp_sink) {
+            pa_assert_se(u->transport->a2dp_sink->init(&u->a2dp_info.a2dp_sink_data));
 
-        switch (config->subbands) {
-            case SBC_SUBBANDS_4:
-                sbc_info->sbc.subbands = SBC_SB_4;
-                break;
-            case SBC_SUBBANDS_8:
-                sbc_info->sbc.subbands = SBC_SB_8;
-                break;
-            default:
-                pa_assert_not_reached();
-        }
+            if (u->transport->a2dp_sink->update_user_config && user_config)
+                u->transport->a2dp_sink->update_user_config(user_config,
+                                                            &u->a2dp_info.a2dp_sink_data);
 
-        switch (config->block_length) {
-            case SBC_BLOCK_LENGTH_4:
-                sbc_info->sbc.blocks = SBC_BLK_4;
-                break;
-            case SBC_BLOCK_LENGTH_8:
-                sbc_info->sbc.blocks = SBC_BLK_8;
-                break;
-            case SBC_BLOCK_LENGTH_12:
-                sbc_info->sbc.blocks = SBC_BLK_12;
-                break;
-            case SBC_BLOCK_LENGTH_16:
-                sbc_info->sbc.blocks = SBC_BLK_16;
-                break;
-            default:
-                pa_assert_not_reached();
-        }
+            u->transport->a2dp_sink->config_transport(u->core->default_sample_spec, u->transport->config,
+                                                      u->transport->config_size,
+                                                      &u->sample_spec, &u->a2dp_info.a2dp_sink_data);
+        } else if (u->transport->a2dp_source) {
+            pa_assert_se(
+                    u->transport->a2dp_source->init(a2dp_encoder_buffer_read_cb, a2dp_encoder_buffer_free_cb,
+                                                    &u->a2dp_info.a2dp_source_data));
 
-        sbc_info->min_bitpool = config->min_bitpool;
-        sbc_info->max_bitpool = config->max_bitpool;
+            if (u->transport->a2dp_source->update_user_config && user_config)
+                u->transport->a2dp_source->update_user_config(user_config,
+                                                              &u->a2dp_info.a2dp_source_data);
 
-        /* Set minimum bitpool for source to get the maximum possible block_size */
-        sbc_info->sbc.bitpool = u->profile == PA_BLUETOOTH_PROFILE_A2DP_SINK ? sbc_info->max_bitpool : sbc_info->min_bitpool;
-        sbc_info->codesize = sbc_get_codesize(&sbc_info->sbc);
-        sbc_info->frame_length = sbc_get_frame_length(&sbc_info->sbc);
+            u->transport->a2dp_source->config_transport(u->core->default_sample_spec, u->transport->config,
+                                                        u->transport->config_size,
+                                                        &u->sample_spec, &u->a2dp_info.a2dp_source_data);
+        } else
+            pa_assert_not_reached();
 
-        pa_log_info("SBC parameters: allocation=%u, subbands=%u, blocks=%u, bitpool=%u",
-                    sbc_info->sbc.allocation, sbc_info->sbc.subbands ? 8 : 4, sbc_info->sbc.blocks, sbc_info->sbc.bitpool);
+        if(user_config)
+            pa_proplist_free(user_config);
     }
 }
 
@@ -1620,6 +1427,11 @@  static void thread_func(void *userdata) {
                     if (audio_sent <= time_passed) {
                         size_t bytes_to_send = pa_usec_to_bytes(time_passed - audio_sent, &u->sample_spec);
 
+                        if (u->transport->a2dp_source && u->transport->a2dp_source->set_tx_length){
+                            u->transport->a2dp_source->set_tx_length(bytes_to_send, &u->a2dp_info.a2dp_source_data);
+                            u->transport->a2dp_source->get_block_size(u->write_link_mtu, &u->write_block_size, &u->a2dp_info.a2dp_source_data);
+                        }
+
                         /* There are more than two blocks that need to be written. It seems that
                          * the socket has not been accepting data fast enough (could be due to
                          * hiccups in the wireless transmission). We need to discard everything
@@ -1651,8 +1463,13 @@  static void thread_func(void *userdata) {
                                 skip_bytes -= bytes_to_render;
                             }
 
-                            if (u->write_index > 0 && u->profile == PA_BLUETOOTH_PROFILE_A2DP_SINK)
-                                a2dp_reduce_bitpool(u);
+                            if (u->write_index > 0 && u->transport->a2dp_source &&
+                                u->transport->a2dp_source->decrease_quality) {
+
+                                u->transport->a2dp_source->decrease_quality(&u->a2dp_info.a2dp_source_data);
+                                u->transport->a2dp_source->get_block_size(u->write_link_mtu, &u->write_block_size, &u->a2dp_info.a2dp_source_data);
+                            }
+
                         }
 
                         blocks_to_write = 1;
@@ -1807,6 +1624,14 @@  static void stop_thread(struct userdata *u) {
     }
 
     if (u->transport) {
+        if(u->transport->a2dp_sink && u->a2dp_info.a2dp_sink_data){
+            u->transport->a2dp_sink->free(&u->a2dp_info.a2dp_sink_data);
+            u->a2dp_info.a2dp_sink_data = NULL;
+        }
+        if(u->transport->a2dp_source && u->a2dp_info.a2dp_sink_data){
+            u->transport->a2dp_source->free(&u->a2dp_info.a2dp_source_data);
+            u->a2dp_info.a2dp_source_data = NULL;
+        }
         transport_release(u);
         u->transport = NULL;
     }
@@ -2415,6 +2240,12 @@  int pa__init(pa_module* m) {
 
     u->device->autodetect_mtu = autodetect_mtu;
 
+    u->a2dp_info.a2dp_config = pa_proplist_new();
+    if (pa_modargs_get_proplist(ma, "a2dp_config", u->a2dp_info.a2dp_config, PA_UPDATE_REPLACE) < 0) {
+        pa_log("Invalid proplist key=value pairs for a2dp_config parameter");
+        goto fail_free_modargs;
+    }
+
     pa_modargs_free(ma);
 
     u->device_connection_changed_slot =
@@ -2492,11 +2323,17 @@  void pa__done(pa_module *m) {
     if (u->transport_microphone_gain_changed_slot)
         pa_hook_slot_free(u->transport_microphone_gain_changed_slot);
 
-    if (u->sbc_info.buffer)
-        pa_xfree(u->sbc_info.buffer);
+    if (u->a2dp_info.buffer)
+        pa_xfree(u->a2dp_info.buffer);
+
+    if (u->a2dp_info.a2dp_sink_data)
+        pa_xfree(u->a2dp_info.a2dp_sink_data);
+
+    if (u->a2dp_info.a2dp_source_data)
+        pa_xfree(u->a2dp_info.a2dp_source_data);
 
-    if (u->sbc_info.sbc_initialized)
-        sbc_finish(&u->sbc_info.sbc);
+    if (u->a2dp_info.a2dp_config)
+        pa_proplist_free(u->a2dp_info.a2dp_config);
 
     if (u->msg)
         pa_xfree(u->msg);
diff --git a/src/modules/bluetooth/module-bluez5-discover.c b/src/modules/bluetooth/module-bluez5-discover.c
index b6c8eb050..9c44eb789 100644
--- a/src/modules/bluetooth/module-bluez5-discover.c
+++ b/src/modules/bluetooth/module-bluez5-discover.c
@@ -2,6 +2,7 @@ 
   This file is part of PulseAudio.
 
   Copyright 2008-2013 João Paulo Rechi Vita
+  Copyright 2018      Huang-Huang Bao
 
   PulseAudio is free software; you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as
@@ -42,6 +43,7 @@  PA_MODULE_USAGE(
 static const char* const valid_modargs[] = {
     "headset",
     "autodetect_mtu",
+    "a2dp_config",
     NULL
 };
 
@@ -52,6 +54,7 @@  struct userdata {
     pa_hook_slot *device_connection_changed_slot;
     pa_bluetooth_discovery *discovery;
     bool autodetect_mtu;
+    const char *a2dp_config;
 };
 
 static pa_hook_result_t device_connection_changed_cb(pa_bluetooth_discovery *y, const pa_bluetooth_device *d, struct userdata *u) {
@@ -72,7 +75,8 @@  static pa_hook_result_t device_connection_changed_cb(pa_bluetooth_discovery *y,
     if (!module_loaded && pa_bluetooth_device_any_transport_connected(d)) {
         /* a new device has been connected */
         pa_module *m;
-        char *args = pa_sprintf_malloc("path=%s autodetect_mtu=%i", d->path, (int)u->autodetect_mtu);
+        char *args = pa_sprintf_malloc("path=%s autodetect_mtu=%i a2dp_config=\"%s\"",
+                                       d->path, (int) u->autodetect_mtu, u->a2dp_config);
 
         pa_log_debug("Loading module-bluez5-device %s", args);
         pa_module_load(&m, u->module->core, "module-bluez5-device", args);
@@ -100,7 +104,7 @@  const char *default_headset_backend = "ofono";
 int pa__init(pa_module *m) {
     struct userdata *u;
     pa_modargs *ma;
-    const char *headset_str;
+    const char *headset_str, *a2dp_config;
     int headset_backend;
     bool autodetect_mtu;
 
@@ -129,10 +133,14 @@  int pa__init(pa_module *m) {
         goto fail;
     }
 
+    pa_assert_se(a2dp_config = pa_modargs_get_value(ma, "a2dp_config", ""));
+
+
     m->userdata = u = pa_xnew0(struct userdata, 1);
     u->module = m;
     u->core = m->core;
     u->autodetect_mtu = autodetect_mtu;
+    u->a2dp_config = pa_xmemdup(a2dp_config, strlen(a2dp_config) + 1);
     u->loaded_device_paths = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
 
     if (!(u->discovery = pa_bluetooth_discovery_get(u->core, headset_backend)))
@@ -169,5 +177,8 @@  void pa__done(pa_module *m) {
     if (u->loaded_device_paths)
         pa_hashmap_free(u->loaded_device_paths);
 
+    if (u->a2dp_config)
+        pa_xfree((void *) u->a2dp_config);
+
     pa_xfree(u);
 }