3 * BlueZ - Bluetooth protocol stack for Linux
5 * Copyright (C) 2004-2009 Marcel Holtmann <marcel@holtmann.org>
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 Message sequence chart of streaming sequence for A2DP transport
28 <--BT_GET_CAPABILITIES_REQ
30 BT_GET_CAPABILITIES_RSP-->
33 <--BT_SETCONFIGURATION_REQ
35 BT_SET_CONFIGURATION_RSP-->
38 <--BT_START_STREAM_REQ
40 <Moves to streaming state>
41 BT_START_STREAM_RSP-->
48 on snd_pcm_drop/snd_pcm_drain
55 on IPC close or appl crash
60 #ifndef BT_AUDIOCLIENT_H
61 #define BT_AUDIOCLIENT_H
70 #include <sys/socket.h>
74 #define BT_SUGGESTED_BUFFER_SIZE 512
75 #define BT_IPC_SOCKET_NAME "\0/org/bluez/audio"
77 /* Generic message header definition, except for RESPONSE messages */
82 } __attribute__ ((packed)) bt_audio_msg_header_t;
85 bt_audio_msg_header_t h;
87 } __attribute__ ((packed)) bt_audio_error_t;
92 #define BT_INDICATION 2
96 #define BT_GET_CAPABILITIES 0
98 #define BT_SET_CONFIGURATION 2
99 #define BT_NEW_STREAM 3
100 #define BT_START_STREAM 4
101 #define BT_STOP_STREAM 5
105 #define BT_CAPABILITIES_TRANSPORT_A2DP 0
106 #define BT_CAPABILITIES_TRANSPORT_SCO 1
107 #define BT_CAPABILITIES_TRANSPORT_ANY 2
109 #define BT_CAPABILITIES_ACCESS_MODE_READ 1
110 #define BT_CAPABILITIES_ACCESS_MODE_WRITE 2
111 #define BT_CAPABILITIES_ACCESS_MODE_READWRITE 3
113 #define BT_FLAG_AUTOCONNECT 1
115 struct bt_get_capabilities_req {
116 bt_audio_msg_header_t h;
117 char source[18]; /* Address of the local Device */
118 char destination[18];/* Address of the remote Device */
119 char object[128]; /* DBus object path */
120 uint8_t transport; /* Requested transport */
121 uint8_t flags; /* Requested flags */
122 uint8_t seid; /* Requested capability configuration */
123 } __attribute__ ((packed));
126 * SBC Codec parameters as per A2DP profile 1.0 ยง 4.3
129 /* A2DP seid are 6 bytes long so HSP/HFP are assigned to 7-8 bits */
130 #define BT_A2DP_SEID_RANGE (1 << 6) - 1
132 #define BT_A2DP_SBC_SOURCE 0x00
133 #define BT_A2DP_SBC_SINK 0x01
134 #define BT_A2DP_MPEG12_SOURCE 0x02
135 #define BT_A2DP_MPEG12_SINK 0x03
136 #define BT_A2DP_MPEG24_SOURCE 0x04
137 #define BT_A2DP_MPEG24_SINK 0x05
138 #define BT_A2DP_ATRAC_SOURCE 0x06
139 #define BT_A2DP_ATRAC_SINK 0x07
140 #define BT_A2DP_UNKNOWN_SOURCE 0x08
141 #define BT_A2DP_UNKNOWN_SINK 0x09
143 #define BT_SBC_SAMPLING_FREQ_16000 (1 << 3)
144 #define BT_SBC_SAMPLING_FREQ_32000 (1 << 2)
145 #define BT_SBC_SAMPLING_FREQ_44100 (1 << 1)
146 #define BT_SBC_SAMPLING_FREQ_48000 1
148 #define BT_A2DP_CHANNEL_MODE_MONO (1 << 3)
149 #define BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL (1 << 2)
150 #define BT_A2DP_CHANNEL_MODE_STEREO (1 << 1)
151 #define BT_A2DP_CHANNEL_MODE_JOINT_STEREO 1
153 #define BT_A2DP_BLOCK_LENGTH_4 (1 << 3)
154 #define BT_A2DP_BLOCK_LENGTH_8 (1 << 2)
155 #define BT_A2DP_BLOCK_LENGTH_12 (1 << 1)
156 #define BT_A2DP_BLOCK_LENGTH_16 1
158 #define BT_A2DP_SUBBANDS_4 (1 << 1)
159 #define BT_A2DP_SUBBANDS_8 1
161 #define BT_A2DP_ALLOCATION_SNR (1 << 1)
162 #define BT_A2DP_ALLOCATION_LOUDNESS 1
164 #define BT_MPEG_SAMPLING_FREQ_16000 (1 << 5)
165 #define BT_MPEG_SAMPLING_FREQ_22050 (1 << 4)
166 #define BT_MPEG_SAMPLING_FREQ_24000 (1 << 3)
167 #define BT_MPEG_SAMPLING_FREQ_32000 (1 << 2)
168 #define BT_MPEG_SAMPLING_FREQ_44100 (1 << 1)
169 #define BT_MPEG_SAMPLING_FREQ_48000 1
171 #define BT_MPEG_LAYER_1 (1 << 2)
172 #define BT_MPEG_LAYER_2 (1 << 1)
173 #define BT_MPEG_LAYER_3 1
175 #define BT_HFP_CODEC_PCM 0x00
177 #define BT_PCM_FLAG_NREC 0x01
178 #define BT_PCM_FLAG_PCM_ROUTING 0x02
180 #define BT_WRITE_LOCK (1 << 1)
181 #define BT_READ_LOCK 1
191 } __attribute__ ((packed)) codec_capabilities_t;
194 codec_capabilities_t capability;
195 uint8_t channel_mode;
197 uint8_t allocation_method;
199 uint8_t block_length;
202 } __attribute__ ((packed)) sbc_capabilities_t;
205 codec_capabilities_t capability;
206 uint8_t channel_mode;
212 } __attribute__ ((packed)) mpeg_capabilities_t;
215 codec_capabilities_t capability;
217 uint16_t sampling_rate;
218 } __attribute__ ((packed)) pcm_capabilities_t;
220 struct bt_get_capabilities_rsp {
221 bt_audio_msg_header_t h;
222 char source[18]; /* Address of the local Device */
223 char destination[18];/* Address of the remote Device */
224 char object[128]; /* DBus object path */
225 uint8_t data[0]; /* First codec_capabilities_t */
226 } __attribute__ ((packed));
229 bt_audio_msg_header_t h;
230 char source[18]; /* Address of the local Device */
231 char destination[18];/* Address of the remote Device */
232 char object[128]; /* DBus object path */
233 uint8_t seid; /* Requested capability configuration to lock */
234 uint8_t lock; /* Requested lock */
235 } __attribute__ ((packed));
238 bt_audio_msg_header_t h;
239 char source[18]; /* Address of the local Device */
240 char destination[18];/* Address of the remote Device */
241 char object[128]; /* DBus object path */
242 } __attribute__ ((packed));
244 struct bt_set_configuration_req {
245 bt_audio_msg_header_t h;
246 codec_capabilities_t codec; /* Requested codec */
247 } __attribute__ ((packed));
249 struct bt_set_configuration_rsp {
250 bt_audio_msg_header_t h;
251 uint16_t link_mtu; /* Max length that transport supports */
252 } __attribute__ ((packed));
254 #define BT_STREAM_ACCESS_READ 0
255 #define BT_STREAM_ACCESS_WRITE 1
256 #define BT_STREAM_ACCESS_READWRITE 2
257 struct bt_start_stream_req {
258 bt_audio_msg_header_t h;
259 } __attribute__ ((packed));
261 struct bt_start_stream_rsp {
262 bt_audio_msg_header_t h;
263 } __attribute__ ((packed));
265 /* This message is followed by one byte of data containing the stream data fd
266 as ancilliary data */
267 struct bt_new_stream_ind {
268 bt_audio_msg_header_t h;
269 } __attribute__ ((packed));
271 struct bt_stop_stream_req {
272 bt_audio_msg_header_t h;
273 } __attribute__ ((packed));
275 struct bt_stop_stream_rsp {
276 bt_audio_msg_header_t h;
277 } __attribute__ ((packed));
279 struct bt_close_req {
280 bt_audio_msg_header_t h;
281 } __attribute__ ((packed));
283 struct bt_close_rsp {
284 bt_audio_msg_header_t h;
285 } __attribute__ ((packed));
287 struct bt_suspend_stream_ind {
288 bt_audio_msg_header_t h;
289 } __attribute__ ((packed));
291 struct bt_resume_stream_ind {
292 bt_audio_msg_header_t h;
293 } __attribute__ ((packed));
295 #define BT_CONTROL_KEY_POWER 0x40
296 #define BT_CONTROL_KEY_VOL_UP 0x41
297 #define BT_CONTROL_KEY_VOL_DOWN 0x42
298 #define BT_CONTROL_KEY_MUTE 0x43
299 #define BT_CONTROL_KEY_PLAY 0x44
300 #define BT_CONTROL_KEY_STOP 0x45
301 #define BT_CONTROL_KEY_PAUSE 0x46
302 #define BT_CONTROL_KEY_RECORD 0x47
303 #define BT_CONTROL_KEY_REWIND 0x48
304 #define BT_CONTROL_KEY_FAST_FORWARD 0x49
305 #define BT_CONTROL_KEY_EJECT 0x4A
306 #define BT_CONTROL_KEY_FORWARD 0x4B
307 #define BT_CONTROL_KEY_BACKWARD 0x4C
309 struct bt_control_req {
310 bt_audio_msg_header_t h;
311 uint8_t mode; /* Control Mode */
312 uint8_t key; /* Control Key */
313 } __attribute__ ((packed));
315 struct bt_control_rsp {
316 bt_audio_msg_header_t h;
317 uint8_t mode; /* Control Mode */
318 uint8_t key; /* Control Key */
319 } __attribute__ ((packed));
321 struct bt_control_ind {
322 bt_audio_msg_header_t h;
323 uint8_t mode; /* Control Mode */
324 uint8_t key; /* Control Key */
325 } __attribute__ ((packed));
327 /* Function declaration */
329 /* Opens a connection to the audio service: return a socket descriptor */
330 int bt_audio_service_open(void);
332 /* Closes a connection to the audio service */
333 int bt_audio_service_close(int sk);
335 /* Receives stream data file descriptor : must be called after a
336 BT_STREAMFD_IND message is returned */
337 int bt_audio_service_get_data_fd(int sk);
339 /* Human readable message type string */
340 const char *bt_audio_strtype(uint8_t type);
342 /* Human readable message name string */
343 const char *bt_audio_strname(uint8_t name);
349 #endif /* BT_AUDIOCLIENT_H */