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

   1 /*
   2  *
   3  *  BlueZ - Bluetooth protocol stack for Linux
   4  *
   5  *  Copyright (C) 2004-2010  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 #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 */