1 /* 2 * 3 * BlueZ - Bluetooth protocol stack for Linux 4 * 5 * Copyright (C) 2004-2010 Marcel Holtmann <marcel (at) holtmann.org> 6 * 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. 11 * 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. 16 * 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 20 * 21 */ 22 23 /* 24 Message sequence chart of streaming sequence for A2DP transport 25 26 Audio daemon User 27 on snd_pcm_open 28 <--BT_GET_CAPABILITIES_REQ 29 30 BT_GET_CAPABILITIES_RSP--> 31 32 on snd_pcm_hw_params 33 <--BT_SETCONFIGURATION_REQ 34 35 BT_SET_CONFIGURATION_RSP--> 36 37 on snd_pcm_prepare 38 <--BT_START_STREAM_REQ 39 40 <Moves to streaming state> 41 BT_START_STREAM_RSP--> 42 43 BT_NEW_STREAM_IND --> 44 45 < streams data > 46 .......... 47 48 on snd_pcm_drop/snd_pcm_drain 49 50 <--BT_STOP_STREAM_REQ 51 52 <Moves to open state> 53 BT_STOP_STREAM_RSP--> 54 55 on IPC close or appl crash 56 <Moves to idle> 57 58 */ 59 60 #ifndef BT_AUDIOCLIENT_H 61 #define BT_AUDIOCLIENT_H 62 63 #ifdef __cplusplus 64 extern "C" { 65 #endif 66 67 #include <stdint.h> 68 #include <stdio.h> 69 #include <unistd.h> 70 #include <sys/socket.h> 71 #include <sys/un.h> 72 #include <errno.h> 73 74 #define BT_SUGGESTED_BUFFER_SIZE 512 75 #define BT_IPC_SOCKET_NAME "\0/org/bluez/audio" 76 77 /* Generic message header definition, except for RESPONSE messages */ 78 typedef struct { 79 uint8_t type; 80 uint8_t name; 81 uint16_t length; 82 } __attribute__ ((packed)) bt_audio_msg_header_t; 83 84 typedef struct { 85 bt_audio_msg_header_t h; 86 uint8_t posix_errno; 87 } __attribute__ ((packed)) bt_audio_error_t; 88 89 /* Message types */ 90 #define BT_REQUEST 0 91 #define BT_RESPONSE 1 92 #define BT_INDICATION 2 93 #define BT_ERROR 3 94 95 /* Messages names */ 96 #define BT_GET_CAPABILITIES 0 97 #define BT_OPEN 1 98 #define BT_SET_CONFIGURATION 2 99 #define BT_NEW_STREAM 3 100 #define BT_START_STREAM 4 101 #define BT_STOP_STREAM 5 102 #define BT_CLOSE 6 103 #define BT_CONTROL 7 104 #define BT_DELAY_REPORT 8 105 106 #define BT_CAPABILITIES_TRANSPORT_A2DP 0 107 #define BT_CAPABILITIES_TRANSPORT_SCO 1 108 #define BT_CAPABILITIES_TRANSPORT_ANY 2 109 110 #define BT_CAPABILITIES_ACCESS_MODE_READ 1 111 #define BT_CAPABILITIES_ACCESS_MODE_WRITE 2 112 #define BT_CAPABILITIES_ACCESS_MODE_READWRITE 3 113 114 #define BT_FLAG_AUTOCONNECT 1 115 116 struct bt_get_capabilities_req { 117 bt_audio_msg_header_t h; 118 char source[18]; /* Address of the local Device */ 119 char destination[18];/* Address of the remote Device */ 120 char object[128]; /* DBus object path */ 121 uint8_t transport; /* Requested transport */ 122 uint8_t flags; /* Requested flags */ 123 uint8_t seid; /* Requested capability configuration */ 124 } __attribute__ ((packed)); 125 126 /** 127 * SBC Codec parameters as per A2DP profile 1.0 4.3 128 */ 129 130 /* A2DP seid are 6 bytes long so HSP/HFP are assigned to 7-8 bits */ 131 #define BT_A2DP_SEID_RANGE (1 << 6) - 1 132 133 #define BT_A2DP_SBC_SOURCE 0x00 134 #define BT_A2DP_SBC_SINK 0x01 135 #define BT_A2DP_MPEG12_SOURCE 0x02 136 #define BT_A2DP_MPEG12_SINK 0x03 137 #define BT_A2DP_MPEG24_SOURCE 0x04 138 #define BT_A2DP_MPEG24_SINK 0x05 139 #define BT_A2DP_ATRAC_SOURCE 0x06 140 #define BT_A2DP_ATRAC_SINK 0x07 141 #define BT_A2DP_UNKNOWN_SOURCE 0x08 142 #define BT_A2DP_UNKNOWN_SINK 0x09 143 144 #define BT_SBC_SAMPLING_FREQ_16000 (1 << 3) 145 #define BT_SBC_SAMPLING_FREQ_32000 (1 << 2) 146 #define BT_SBC_SAMPLING_FREQ_44100 (1 << 1) 147 #define BT_SBC_SAMPLING_FREQ_48000 1 148 149 #define BT_A2DP_CHANNEL_MODE_MONO (1 << 3) 150 #define BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL (1 << 2) 151 #define BT_A2DP_CHANNEL_MODE_STEREO (1 << 1) 152 #define BT_A2DP_CHANNEL_MODE_JOINT_STEREO 1 153 154 #define BT_A2DP_BLOCK_LENGTH_4 (1 << 3) 155 #define BT_A2DP_BLOCK_LENGTH_8 (1 << 2) 156 #define BT_A2DP_BLOCK_LENGTH_12 (1 << 1) 157 #define BT_A2DP_BLOCK_LENGTH_16 1 158 159 #define BT_A2DP_SUBBANDS_4 (1 << 1) 160 #define BT_A2DP_SUBBANDS_8 1 161 162 #define BT_A2DP_ALLOCATION_SNR (1 << 1) 163 #define BT_A2DP_ALLOCATION_LOUDNESS 1 164 165 #define BT_MPEG_SAMPLING_FREQ_16000 (1 << 5) 166 #define BT_MPEG_SAMPLING_FREQ_22050 (1 << 4) 167 #define BT_MPEG_SAMPLING_FREQ_24000 (1 << 3) 168 #define BT_MPEG_SAMPLING_FREQ_32000 (1 << 2) 169 #define BT_MPEG_SAMPLING_FREQ_44100 (1 << 1) 170 #define BT_MPEG_SAMPLING_FREQ_48000 1 171 172 #define BT_MPEG_LAYER_1 (1 << 2) 173 #define BT_MPEG_LAYER_2 (1 << 1) 174 #define BT_MPEG_LAYER_3 1 175 176 #define BT_HFP_CODEC_PCM 0x00 177 178 #define BT_PCM_FLAG_NREC 0x01 179 #define BT_PCM_FLAG_PCM_ROUTING 0x02 180 181 #define BT_WRITE_LOCK (1 << 1) 182 #define BT_READ_LOCK 1 183 184 typedef struct { 185 uint8_t seid; 186 uint8_t transport; 187 uint8_t type; 188 uint8_t length; 189 uint8_t configured; 190 uint8_t lock; 191 uint8_t data[0]; 192 } __attribute__ ((packed)) codec_capabilities_t; 193 194 typedef struct { 195 codec_capabilities_t capability; 196 uint8_t channel_mode; 197 uint8_t frequency; 198 uint8_t allocation_method; 199 uint8_t subbands; 200 uint8_t block_length; 201 uint8_t min_bitpool; 202 uint8_t max_bitpool; 203 } __attribute__ ((packed)) sbc_capabilities_t; 204 205 typedef struct { 206 codec_capabilities_t capability; 207 uint8_t channel_mode; 208 uint8_t crc; 209 uint8_t layer; 210 uint8_t frequency; 211 uint8_t mpf; 212 uint16_t bitrate; 213 } __attribute__ ((packed)) mpeg_capabilities_t; 214 215 typedef struct { 216 codec_capabilities_t capability; 217 uint8_t flags; 218 uint16_t sampling_rate; 219 } __attribute__ ((packed)) pcm_capabilities_t; 220 221 struct bt_get_capabilities_rsp { 222 bt_audio_msg_header_t h; 223 char source[18]; /* Address of the local Device */ 224 char destination[18];/* Address of the remote Device */ 225 char object[128]; /* DBus object path */ 226 uint8_t data[0]; /* First codec_capabilities_t */ 227 } __attribute__ ((packed)); 228 229 struct bt_open_req { 230 bt_audio_msg_header_t h; 231 char source[18]; /* Address of the local Device */ 232 char destination[18];/* Address of the remote Device */ 233 char object[128]; /* DBus object path */ 234 uint8_t seid; /* Requested capability configuration to lock */ 235 uint8_t lock; /* Requested lock */ 236 } __attribute__ ((packed)); 237 238 struct bt_open_rsp { 239 bt_audio_msg_header_t h; 240 char source[18]; /* Address of the local Device */ 241 char destination[18];/* Address of the remote Device */ 242 char object[128]; /* DBus object path */ 243 } __attribute__ ((packed)); 244 245 struct bt_set_configuration_req { 246 bt_audio_msg_header_t h; 247 codec_capabilities_t codec; /* Requested codec */ 248 } __attribute__ ((packed)); 249 250 struct bt_set_configuration_rsp { 251 bt_audio_msg_header_t h; 252 uint16_t link_mtu; /* Max length that transport supports */ 253 } __attribute__ ((packed)); 254 255 #define BT_STREAM_ACCESS_READ 0 256 #define BT_STREAM_ACCESS_WRITE 1 257 #define BT_STREAM_ACCESS_READWRITE 2 258 struct bt_start_stream_req { 259 bt_audio_msg_header_t h; 260 } __attribute__ ((packed)); 261 262 struct bt_start_stream_rsp { 263 bt_audio_msg_header_t h; 264 } __attribute__ ((packed)); 265 266 /* This message is followed by one byte of data containing the stream data fd 267 as ancilliary data */ 268 struct bt_new_stream_ind { 269 bt_audio_msg_header_t h; 270 } __attribute__ ((packed)); 271 272 struct bt_stop_stream_req { 273 bt_audio_msg_header_t h; 274 } __attribute__ ((packed)); 275 276 struct bt_stop_stream_rsp { 277 bt_audio_msg_header_t h; 278 } __attribute__ ((packed)); 279 280 struct bt_close_req { 281 bt_audio_msg_header_t h; 282 } __attribute__ ((packed)); 283 284 struct bt_close_rsp { 285 bt_audio_msg_header_t h; 286 } __attribute__ ((packed)); 287 288 struct bt_suspend_stream_ind { 289 bt_audio_msg_header_t h; 290 } __attribute__ ((packed)); 291 292 struct bt_resume_stream_ind { 293 bt_audio_msg_header_t h; 294 } __attribute__ ((packed)); 295 296 #define BT_CONTROL_KEY_POWER 0x40 297 #define BT_CONTROL_KEY_VOL_UP 0x41 298 #define BT_CONTROL_KEY_VOL_DOWN 0x42 299 #define BT_CONTROL_KEY_MUTE 0x43 300 #define BT_CONTROL_KEY_PLAY 0x44 301 #define BT_CONTROL_KEY_STOP 0x45 302 #define BT_CONTROL_KEY_PAUSE 0x46 303 #define BT_CONTROL_KEY_RECORD 0x47 304 #define BT_CONTROL_KEY_REWIND 0x48 305 #define BT_CONTROL_KEY_FAST_FORWARD 0x49 306 #define BT_CONTROL_KEY_EJECT 0x4A 307 #define BT_CONTROL_KEY_FORWARD 0x4B 308 #define BT_CONTROL_KEY_BACKWARD 0x4C 309 310 struct bt_control_req { 311 bt_audio_msg_header_t h; 312 uint8_t mode; /* Control Mode */ 313 uint8_t key; /* Control Key */ 314 } __attribute__ ((packed)); 315 316 struct bt_control_rsp { 317 bt_audio_msg_header_t h; 318 uint8_t mode; /* Control Mode */ 319 uint8_t key; /* Control Key */ 320 } __attribute__ ((packed)); 321 322 struct bt_control_ind { 323 bt_audio_msg_header_t h; 324 uint8_t mode; /* Control Mode */ 325 uint8_t key; /* Control Key */ 326 } __attribute__ ((packed)); 327 328 struct bt_delay_report_req { 329 bt_audio_msg_header_t h; 330 uint16_t delay; 331 } __attribute__ ((packed)); 332 333 struct bt_delay_report_ind { 334 bt_audio_msg_header_t h; 335 uint16_t delay; 336 } __attribute__ ((packed)); 337 338 /* Function declaration */ 339 340 /* Opens a connection to the audio service: return a socket descriptor */ 341 int bt_audio_service_open(void); 342 343 /* Closes a connection to the audio service */ 344 int bt_audio_service_close(int sk); 345 346 /* Receives stream data file descriptor : must be called after a 347 BT_STREAMFD_IND message is returned */ 348 int bt_audio_service_get_data_fd(int sk); 349 350 /* Human readable message type string */ 351 const char *bt_audio_strtype(uint8_t type); 352 353 /* Human readable message name string */ 354 const char *bt_audio_strname(uint8_t name); 355 356 #ifdef __cplusplus 357 } 358 #endif 359 360 #endif /* BT_AUDIOCLIENT_H */ 361
