code.delx.au - pulseaudio/blob - src/modules/bluetooth/ipc.h

   1 /*
   2  *
   3  *  BlueZ - Bluetooth protocol stack for Linux
   4  *
   5  *  Copyright (C) 2004-2009  Marcel Holtmann <marcel@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
 105 #define BT_CAPABILITIES_TRANSPORT_A2DP  0
 106 #define BT_CAPABILITIES_TRANSPORT_SCO   1
 107 #define BT_CAPABILITIES_TRANSPORT_ANY   2
 108
 109 #define BT_CAPABILITIES_ACCESS_MODE_READ        1
 110 #define BT_CAPABILITIES_ACCESS_MODE_WRITE       2
 111 #define BT_CAPABILITIES_ACCESS_MODE_READWRITE   3
 112
 113 #define BT_FLAG_AUTOCONNECT     1
 114
 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));
 124
 125 /**
 126  * SBC Codec parameters as per A2DP profile 1.0 § 4.3
 127  */
 128
 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
 131
 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
 142
 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
 147
 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
 152
 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
 157
 158 #define BT_A2DP_SUBBANDS_4                      (1 << 1)
 159 #define BT_A2DP_SUBBANDS_8                      1
 160
 161 #define BT_A2DP_ALLOCATION_SNR                  (1 << 1)
 162 #define BT_A2DP_ALLOCATION_LOUDNESS             1
 163
 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
 170
 171 #define BT_MPEG_LAYER_1                         (1 << 2)
 172 #define BT_MPEG_LAYER_2                         (1 << 1)
 173 #define BT_MPEG_LAYER_3                         1
 174
 175 #define BT_HFP_CODEC_PCM                        0x00
 176
 177 #define BT_PCM_FLAG_NREC                        0x01
 178 #define BT_PCM_FLAG_PCM_ROUTING                 0x02
 179
 180 #define BT_WRITE_LOCK                           (1 << 1)
 181 #define BT_READ_LOCK                            1
 182
 183 typedef struct {
 184         uint8_t seid;
 185         uint8_t transport;
 186         uint8_t type;
 187         uint8_t length;
 188         uint8_t configured;
 189         uint8_t lock;
 190         uint8_t data[0];
 191 } __attribute__ ((packed)) codec_capabilities_t;
 192
 193 typedef struct {
 194         codec_capabilities_t capability;
 195         uint8_t channel_mode;
 196         uint8_t frequency;
 197         uint8_t allocation_method;
 198         uint8_t subbands;
 199         uint8_t block_length;
 200         uint8_t min_bitpool;
 201         uint8_t max_bitpool;
 202 } __attribute__ ((packed)) sbc_capabilities_t;
 203
 204 #if __BYTE_ORDER == __LITTLE_ENDIAN
 205
 206 typedef struct {
 207         uint8_t channel_mode:4;
 208         uint8_t frequency:4;
 209         uint8_t allocation_method:2;
 210         uint8_t subbands:2;
 211         uint8_t block_length:4;
 212         uint8_t min_bitpool;
 213         uint8_t max_bitpool;
 214 } __attribute__ ((packed)) sbc_capabilities_raw_t;
 215
 216 #elif __BYTE_ORDER == __BIG_ENDIAN
 217
 218 typedef struct {
 219         uint8_t frequency:4;
 220         uint8_t channel_mode:4;
 221         uint8_t block_length:4;
 222         uint8_t subbands:2;
 223         uint8_t allocation_method:2;
 224         uint8_t min_bitpool;
 225         uint8_t max_bitpool;
 226 } __attribute__ ((packed)) sbc_capabilities_raw_t;
 227
 228 #else
 229 #error "Unknown byte order"
 230 #endif
 231
 232 typedef struct {
 233         codec_capabilities_t capability;
 234         uint8_t channel_mode;
 235         uint8_t crc;
 236         uint8_t layer;
 237         uint8_t frequency;
 238         uint8_t mpf;
 239         uint16_t bitrate;
 240 } __attribute__ ((packed)) mpeg_capabilities_t;
 241
 242 typedef struct {
 243         codec_capabilities_t capability;
 244         uint8_t flags;
 245         uint16_t sampling_rate;
 246 } __attribute__ ((packed)) pcm_capabilities_t;
 247
 248 struct bt_get_capabilities_rsp {
 249         bt_audio_msg_header_t   h;
 250         char                    source[18];     /* Address of the local Device */
 251         char                    destination[18];/* Address of the remote Device */
 252         char                    object[128];    /* DBus object path */
 253         uint8_t                 data[0];        /* First codec_capabilities_t */
 254 } __attribute__ ((packed));
 255
 256 struct bt_open_req {
 257         bt_audio_msg_header_t   h;
 258         char                    source[18];     /* Address of the local Device */
 259         char                    destination[18];/* Address of the remote Device */
 260         char                    object[128];    /* DBus object path */
 261         uint8_t                 seid;           /* Requested capability configuration to lock */
 262         uint8_t                 lock;           /* Requested lock */
 263 } __attribute__ ((packed));
 264
 265 struct bt_open_rsp {
 266         bt_audio_msg_header_t   h;
 267         char                    source[18];     /* Address of the local Device */
 268         char                    destination[18];/* Address of the remote Device */
 269         char                    object[128];    /* DBus object path */
 270 } __attribute__ ((packed));
 271
 272 struct bt_set_configuration_req {
 273         bt_audio_msg_header_t   h;
 274         codec_capabilities_t    codec;          /* Requested codec */
 275 } __attribute__ ((packed));
 276
 277 struct bt_set_configuration_rsp {
 278         bt_audio_msg_header_t   h;
 279         uint16_t                link_mtu;       /* Max length that transport supports */
 280 } __attribute__ ((packed));
 281
 282 #define BT_STREAM_ACCESS_READ           0
 283 #define BT_STREAM_ACCESS_WRITE          1
 284 #define BT_STREAM_ACCESS_READWRITE      2
 285 struct bt_start_stream_req {
 286         bt_audio_msg_header_t   h;
 287 } __attribute__ ((packed));
 288
 289 struct bt_start_stream_rsp {
 290         bt_audio_msg_header_t   h;
 291 } __attribute__ ((packed));
 292
 293 /* This message is followed by one byte of data containing the stream data fd
 294    as ancilliary data */
 295 struct bt_new_stream_ind {
 296         bt_audio_msg_header_t   h;
 297 } __attribute__ ((packed));
 298
 299 struct bt_stop_stream_req {
 300         bt_audio_msg_header_t   h;
 301 } __attribute__ ((packed));
 302
 303 struct bt_stop_stream_rsp {
 304         bt_audio_msg_header_t   h;
 305 } __attribute__ ((packed));
 306
 307 struct bt_close_req {
 308         bt_audio_msg_header_t   h;
 309 } __attribute__ ((packed));
 310
 311 struct bt_close_rsp {
 312         bt_audio_msg_header_t   h;
 313 } __attribute__ ((packed));
 314
 315 struct bt_suspend_stream_ind {
 316         bt_audio_msg_header_t   h;
 317 } __attribute__ ((packed));
 318
 319 struct bt_resume_stream_ind {
 320         bt_audio_msg_header_t   h;
 321 } __attribute__ ((packed));
 322
 323 #define BT_CONTROL_KEY_POWER                    0x40
 324 #define BT_CONTROL_KEY_VOL_UP                   0x41
 325 #define BT_CONTROL_KEY_VOL_DOWN                 0x42
 326 #define BT_CONTROL_KEY_MUTE                     0x43
 327 #define BT_CONTROL_KEY_PLAY                     0x44
 328 #define BT_CONTROL_KEY_STOP                     0x45
 329 #define BT_CONTROL_KEY_PAUSE                    0x46
 330 #define BT_CONTROL_KEY_RECORD                   0x47
 331 #define BT_CONTROL_KEY_REWIND                   0x48
 332 #define BT_CONTROL_KEY_FAST_FORWARD             0x49
 333 #define BT_CONTROL_KEY_EJECT                    0x4A
 334 #define BT_CONTROL_KEY_FORWARD                  0x4B
 335 #define BT_CONTROL_KEY_BACKWARD                 0x4C
 336
 337 struct bt_control_req {
 338         bt_audio_msg_header_t   h;
 339         uint8_t                 mode;           /* Control Mode */
 340         uint8_t                 key;            /* Control Key */
 341 } __attribute__ ((packed));
 342
 343 struct bt_control_rsp {
 344         bt_audio_msg_header_t   h;
 345         uint8_t                 mode;           /* Control Mode */
 346         uint8_t                 key;            /* Control Key */
 347 } __attribute__ ((packed));
 348
 349 struct bt_control_ind {
 350         bt_audio_msg_header_t   h;
 351         uint8_t                 mode;           /* Control Mode */
 352         uint8_t                 key;            /* Control Key */
 353 } __attribute__ ((packed));
 354
 355 /* Function declaration */
 356
 357 /* Opens a connection to the audio service: return a socket descriptor */
 358 int bt_audio_service_open(void);
 359
 360 /* Closes a connection to the audio service */
 361 int bt_audio_service_close(int sk);
 362
 363 /* Receives stream data file descriptor : must be called after a
 364 BT_STREAMFD_IND message is returned */
 365 int bt_audio_service_get_data_fd(int sk);
 366
 367 /* Human readable message type string */
 368 const char *bt_audio_strtype(uint8_t type);
 369
 370 /* Human readable message name string */
 371 const char *bt_audio_strname(uint8_t name);
 372
 373 #ifdef __cplusplus
 374 }
 375 #endif
 376
 377 #endif /* BT_AUDIOCLIENT_H */