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

   1 /*
   2  *
   3  *  BlueZ - Bluetooth protocol stack for Linux
   4  *
   5  *  Copyright (C) 2004-2008  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   128
  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_SET_CONFIGURATION            1
  98 #define BT_NEW_STREAM                   2
  99 #define BT_START_STREAM                 3
 100 #define BT_STOP_STREAM                  4
 101 #define BT_SUSPEND_STREAM               5
 102 #define BT_RESUME_STREAM                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                    device[18];     /* Address of the remote Device */
 118         uint8_t                 transport;      /* Requested transport */
 119         uint8_t                 flags;          /* Requested flags */
 120 } __attribute__ ((packed));
 121
 122 /**
 123  * SBC Codec parameters as per A2DP profile 1.0 § 4.3
 124  */
 125
 126 #define BT_A2DP_CODEC_SBC                       0x00
 127 #define BT_A2DP_CODEC_MPEG12                    0x01
 128 #define BT_A2DP_CODEC_MPEG24                    0x02
 129 #define BT_A2DP_CODEC_ATRAC                     0x03
 130
 131 #define BT_SBC_SAMPLING_FREQ_16000              (1 << 3)
 132 #define BT_SBC_SAMPLING_FREQ_32000              (1 << 2)
 133 #define BT_SBC_SAMPLING_FREQ_44100              (1 << 1)
 134 #define BT_SBC_SAMPLING_FREQ_48000              1
 135
 136 #define BT_A2DP_CHANNEL_MODE_MONO               (1 << 3)
 137 #define BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL       (1 << 2)
 138 #define BT_A2DP_CHANNEL_MODE_STEREO             (1 << 1)
 139 #define BT_A2DP_CHANNEL_MODE_JOINT_STEREO       1
 140
 141 #define BT_A2DP_BLOCK_LENGTH_4                  (1 << 3)
 142 #define BT_A2DP_BLOCK_LENGTH_8                  (1 << 2)
 143 #define BT_A2DP_BLOCK_LENGTH_12                 (1 << 1)
 144 #define BT_A2DP_BLOCK_LENGTH_16                 1
 145
 146 #define BT_A2DP_SUBBANDS_4                      (1 << 1)
 147 #define BT_A2DP_SUBBANDS_8                      1
 148
 149 #define BT_A2DP_ALLOCATION_SNR                  (1 << 1)
 150 #define BT_A2DP_ALLOCATION_LOUDNESS             1
 151
 152 #define BT_MPEG_SAMPLING_FREQ_16000             (1 << 5)
 153 #define BT_MPEG_SAMPLING_FREQ_22050             (1 << 4)
 154 #define BT_MPEG_SAMPLING_FREQ_24000             (1 << 3)
 155 #define BT_MPEG_SAMPLING_FREQ_32000             (1 << 2)
 156 #define BT_MPEG_SAMPLING_FREQ_44100             (1 << 1)
 157 #define BT_MPEG_SAMPLING_FREQ_48000             1
 158
 159 #define BT_MPEG_LAYER_1                         (1 << 2)
 160 #define BT_MPEG_LAYER_2                         (1 << 1)
 161 #define BT_MPEG_LAYER_3                         1
 162
 163 #define BT_HFP_CODEC_PCM                        0x00
 164
 165 #define BT_PCM_FLAG_NREC                        1
 166
 167 typedef struct {
 168         uint8_t transport;
 169         uint8_t type;
 170         uint8_t length;
 171         uint8_t data[0];
 172 } __attribute__ ((packed)) codec_capabilities_t;
 173
 174 typedef struct {
 175         codec_capabilities_t capability;
 176         uint8_t channel_mode;
 177         uint8_t frequency;
 178         uint8_t allocation_method;
 179         uint8_t subbands;
 180         uint8_t block_length;
 181         uint8_t min_bitpool;
 182         uint8_t max_bitpool;
 183 } __attribute__ ((packed)) sbc_capabilities_t;
 184
 185 typedef struct {
 186         codec_capabilities_t capability;
 187         uint8_t channel_mode;
 188         uint8_t crc;
 189         uint8_t layer;
 190         uint8_t frequency;
 191         uint8_t mpf;
 192         uint16_t bitrate;
 193 } __attribute__ ((packed)) mpeg_capabilities_t;
 194
 195 typedef struct {
 196         codec_capabilities_t capability;
 197         uint8_t flags;
 198         uint16_t sampling_rate;
 199 } __attribute__ ((packed)) pcm_capabilities_t;
 200
 201
 202 struct bt_get_capabilities_rsp {
 203         bt_audio_msg_header_t   h;
 204         uint8_t                 data[0];        /* First codec_capabilities_t */
 205 } __attribute__ ((packed));
 206
 207 struct bt_set_configuration_req {
 208         bt_audio_msg_header_t   h;
 209         char                    device[18];     /* Address of the remote Device */
 210         uint8_t                 access_mode;    /* Requested access mode */
 211         codec_capabilities_t    codec;          /* Requested codec */
 212 } __attribute__ ((packed));
 213
 214 struct bt_set_configuration_rsp {
 215         bt_audio_msg_header_t   h;
 216         uint8_t                 transport;      /* Granted transport */
 217         uint8_t                 access_mode;    /* Granted access mode */
 218         uint16_t                link_mtu;       /* Max length that transport supports */
 219 } __attribute__ ((packed));
 220
 221 #define BT_STREAM_ACCESS_READ           0
 222 #define BT_STREAM_ACCESS_WRITE          1
 223 #define BT_STREAM_ACCESS_READWRITE      2
 224 struct bt_start_stream_req {
 225         bt_audio_msg_header_t   h;
 226 } __attribute__ ((packed));
 227
 228 struct bt_start_stream_rsp {
 229         bt_audio_msg_header_t   h;
 230 } __attribute__ ((packed));
 231
 232 /* This message is followed by one byte of data containing the stream data fd
 233    as ancilliary data */
 234 struct bt_new_stream_ind {
 235         bt_audio_msg_header_t   h;
 236 } __attribute__ ((packed));
 237
 238 struct bt_stop_stream_req {
 239         bt_audio_msg_header_t   h;
 240 } __attribute__ ((packed));
 241
 242 struct bt_stop_stream_rsp {
 243         bt_audio_msg_header_t   h;
 244 } __attribute__ ((packed));
 245
 246 struct bt_suspend_stream_ind {
 247         bt_audio_msg_header_t   h;
 248 } __attribute__ ((packed));
 249
 250 struct bt_resume_stream_ind {
 251         bt_audio_msg_header_t   h;
 252 } __attribute__ ((packed));
 253
 254 #define BT_CONTROL_KEY_POWER                    0x40
 255 #define BT_CONTROL_KEY_VOL_UP                   0x41
 256 #define BT_CONTROL_KEY_VOL_DOWN                 0x42
 257 #define BT_CONTROL_KEY_MUTE                     0x43
 258 #define BT_CONTROL_KEY_PLAY                     0x44
 259 #define BT_CONTROL_KEY_STOP                     0x45
 260 #define BT_CONTROL_KEY_PAUSE                    0x46
 261 #define BT_CONTROL_KEY_RECORD                   0x47
 262 #define BT_CONTROL_KEY_REWIND                   0x48
 263 #define BT_CONTROL_KEY_FAST_FORWARD             0x49
 264 #define BT_CONTROL_KEY_EJECT                    0x4A
 265 #define BT_CONTROL_KEY_FORWARD                  0x4B
 266 #define BT_CONTROL_KEY_BACKWARD                 0x4C
 267
 268 struct bt_control_req {
 269         bt_audio_msg_header_t   h;
 270         uint8_t                 mode;           /* Control Mode */
 271         uint8_t                 key;            /* Control Key */
 272 } __attribute__ ((packed));
 273
 274 struct bt_control_rsp {
 275         bt_audio_msg_header_t   h;
 276         uint8_t                 mode;           /* Control Mode */
 277         uint8_t                 key;            /* Control Key */
 278 } __attribute__ ((packed));
 279
 280 struct bt_control_ind {
 281         bt_audio_msg_header_t   h;
 282         uint8_t                 mode;           /* Control Mode */
 283         uint8_t                 key;            /* Control Key */
 284 } __attribute__ ((packed));
 285
 286 /* Function declaration */
 287
 288 /* Opens a connection to the audio service: return a socket descriptor */
 289 int bt_audio_service_open(void);
 290
 291 /* Closes a connection to the audio service */
 292 int bt_audio_service_close(int sk);
 293
 294 /* Receives stream data file descriptor : must be called after a
 295 BT_STREAMFD_IND message is returned */
 296 int bt_audio_service_get_data_fd(int sk);
 297
 298 /* Human readable message type string */
 299 const char *bt_audio_strtype(uint8_t type);
 300
 301 /* Human readable message name string */
 302 const char *bt_audio_strname(uint8_t name);
 303
 304 #ifdef __cplusplus
 305 }
 306 #endif
 307
 308 #endif /* BT_AUDIOCLIENT_H */