src/modules/module-bt-device.c

   1 /***
   2     This file is part of PulseAudio.
   3
   4     Copyright 2008 Joao Paulo Rechi Vita
   5
   6     PulseAudio is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU Lesser General Public License as published
   8     by the Free Software Foundation; either version 2 of the License,
   9     or (at your option) any later version.
  10
  11     PulseAudio is distributed in the hope that it will be useful, but
  12     WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14     General Public License for more details.
  15
  16     You should have received a copy of the GNU Lesser General Public License
  17     along with PulseAudio; if not, write to the Free Software
  18     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19     USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <string.h>
  27 #include <errno.h>
  28 #include <poll.h>
  29
  30 #include <pulse/xmalloc.h>
  31 #include <pulse/timeval.h>
  32 #include <pulse/sample.h>
  33 #include <pulsecore/core-util.h>
  34 #include <pulsecore/core-error.h>
  35 #include <pulsecore/module.h>
  36 #include <pulsecore/modargs.h>
  37 #include <pulsecore/thread.h>
  38 #include <pulsecore/thread-mq.h>
  39 #include <pulsecore/rtpoll.h>
  40 #include <pulsecore/time-smoother.h>
  41 #include <pulsecore/rtclock.h>
  42
  43 #include "dbus-util.h"
  44 #include "module-bt-device-symdef.h"
  45 #include "bt-ipc.h"
  46 #include "bt-sbc.h"
  47 #include "bt-rtp.h"
  48
  49 #define DEFAULT_SINK_NAME "bluetooth_sink"
  50 #define BUFFER_SIZE 2048
  51 #define MAX_BITPOOL 64
  52 #define MIN_BITPOOL 2
  53 #define SOL_SCO 17
  54 #define SCO_TXBUFS 0x03
  55 #define SCO_RXBUFS 0x04
  56
  57 PA_MODULE_AUTHOR("Joao Paulo Rechi Vita");
  58 PA_MODULE_DESCRIPTION("Bluetooth audio sink and source");
  59 PA_MODULE_VERSION(PACKAGE_VERSION);
  60 PA_MODULE_LOAD_ONCE(FALSE);
  61 PA_MODULE_USAGE(
  62         "name=<name of the device> "
  63         "addr=<address of the device> "
  64         "profile=<a2dp|hsp>");
  65
  66 struct bt_a2dp {
  67     sbc_capabilities_t sbc_capabilities;
  68     sbc_t sbc;                           /* Codec data */
  69     int sbc_initialized;                 /* Keep track if the encoder is initialized */
  70     int codesize;                        /* SBC codesize */
  71     int samples;                         /* Number of encoded samples */
  72     uint8_t buffer[BUFFER_SIZE];         /* Codec transfer buffer */
  73     int count;                           /* Codec transfer buffer counter */
  74
  75     int nsamples;                        /* Cumulative number of codec samples */
  76     uint16_t seq_num;                    /* Cumulative packet sequence */
  77     int frame_count;                     /* Current frames in buffer*/
  78 };
  79
  80 struct userdata {
  81     pa_core *core;
  82     pa_module *module;
  83     pa_sink *sink;
  84
  85     pa_thread_mq thread_mq;
  86     pa_rtpoll *rtpoll;
  87     pa_rtpoll_item *rtpoll_item;
  88     pa_thread *thread;
  89
  90     int64_t offset;
  91     pa_smoother *smoother;
  92
  93     pa_memchunk memchunk;
  94     pa_mempool *mempool;
  95
  96     const char *name;
  97     const char *addr;
  98     const char *profile;
  99     int rate;
 100     int channels;
 101     pa_sample_spec ss;
 102
 103     int audioservice_fd;
 104     int stream_fd;
 105
 106     int transport;
 107     int link_mtu;
 108     size_t block_size;
 109     pa_usec_t latency;
 110
 111     struct bt_a2dp a2dp;
 112 };
 113
 114 static const char* const valid_modargs[] = {
 115     "name",
 116     "addr",
 117     "profile",
 118     "rate",
 119     "channels",
 120     NULL
 121 };
 122
 123 static int bt_audioservice_send(int sk, const bt_audio_msg_header_t *msg) {
 124     int e;
 125     pa_log/*_debug*/("sending %s", bt_audio_strmsg(msg->msg_type));
 126     if (send(sk, msg, BT_AUDIO_IPC_PACKET_SIZE, 0) > 0)
 127         e = 0;
 128     else {
 129         e = -errno;
 130         pa_log_error("Error sending data to audio service: %s(%d)", pa_cstrerror(errno), errno);
 131     }
 132     return e;
 133 }
 134
 135 static int bt_audioservice_recv(int sk, bt_audio_msg_header_t *inmsg) {
 136     int e;
 137     const char *type;
 138
 139     pa_log/*_debug*/("trying to receive msg from audio service...");
 140     if (recv(sk, inmsg, BT_AUDIO_IPC_PACKET_SIZE, 0) > 0) {
 141         type = bt_audio_strmsg(inmsg->msg_type);
 142         if (type) {
 143             pa_log/*_debug*/("Received %s", type);
 144             e = 0;
 145         }
 146         else {
 147             e = -EINVAL;
 148             pa_log_error("Bogus message type %d received from audio service", inmsg->msg_type);
 149         }
 150     }
 151     else {
 152         e = -errno;
 153         pa_log_error("Error receiving data from audio service: %s(%d)", pa_cstrerror(errno), errno);
 154     }
 155
 156     return e;
 157 }
 158
 159 static int bt_audioservice_expect(int sk, bt_audio_msg_header_t *rsp_hdr, int expected_type) {
 160     int e = bt_audioservice_recv(sk, rsp_hdr);
 161     if (e == 0) {
 162         if (rsp_hdr->msg_type != expected_type) {
 163             e = -EINVAL;
 164             pa_log_error("Bogus message %s received while %s was expected", bt_audio_strmsg(rsp_hdr->msg_type),
 165                     bt_audio_strmsg(expected_type));
 166         }
 167     }
 168     return e;
 169 }
 170
 171 static int bt_getcaps(struct userdata *u) {
 172     int e;
 173     char buf[BT_AUDIO_IPC_PACKET_SIZE];
 174     bt_audio_rsp_msg_header_t *rsp_hdr = (void*) buf;
 175     struct bt_getcapabilities_req *getcaps_req = (void*) buf;
 176     struct bt_getcapabilities_rsp *getcaps_rsp = (void*) buf;
 177
 178     memset(getcaps_req, 0, BT_AUDIO_IPC_PACKET_SIZE);
 179     getcaps_req->h.msg_type = BT_GETCAPABILITIES_REQ;
 180     strncpy(getcaps_req->device, u->addr, 18);
 181     if (strcasecmp(u->profile, "a2dp") == 0)
 182         getcaps_req->transport = BT_CAPABILITIES_TRANSPORT_A2DP;
 183     else if (strcasecmp(u->profile, "hsp") == 0)
 184         getcaps_req->transport = BT_CAPABILITIES_TRANSPORT_SCO;
 185     else {
 186         pa_log_error("invalid profile argument: %s", u->profile);
 187         return -1;
 188     }
 189     getcaps_req->flags = 0;
 190     getcaps_req->flags |= BT_FLAG_AUTOCONNECT;
 191
 192     e = bt_audioservice_send(u->audioservice_fd, &getcaps_req->h);
 193     if (e < 0) {
 194         pa_log_error("failed to send GETCAPABILITIES_REQ");
 195         return e;
 196     }
 197
 198     e = bt_audioservice_expect(u->audioservice_fd, &rsp_hdr->msg_h, BT_GETCAPABILITIES_RSP);
 199     if (e < 0) {
 200         pa_log_error("failed to expect for GETCAPABILITIES_RSP");
 201         return e;
 202     }
 203     if (rsp_hdr->posix_errno != 0) {
 204         pa_log_error("BT_GETCAPABILITIES failed : %s (%d)", pa_cstrerror(rsp_hdr->posix_errno), rsp_hdr->posix_errno);
 205         return -rsp_hdr->posix_errno;
 206     }
 207
 208     if ((u->transport = getcaps_rsp->transport) == BT_CAPABILITIES_TRANSPORT_A2DP)
 209         u->a2dp.sbc_capabilities = getcaps_rsp->sbc_capabilities;
 210
 211     return 0;
 212 }
 213
 214 static uint8_t default_bitpool(uint8_t freq, uint8_t mode) {
 215     switch (freq) {
 216         case BT_SBC_SAMPLING_FREQ_16000:
 217         case BT_SBC_SAMPLING_FREQ_32000:
 218             return 53;
 219         case BT_SBC_SAMPLING_FREQ_44100:
 220             switch (mode) {
 221                 case BT_A2DP_CHANNEL_MODE_MONO:
 222                 case BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL:
 223                     return 31;
 224                 case BT_A2DP_CHANNEL_MODE_STEREO:
 225                 case BT_A2DP_CHANNEL_MODE_JOINT_STEREO:
 226                     return 53;
 227                 default:
 228                     pa_log_warn("Invalid channel mode %u", mode);
 229                     return 53;
 230             }
 231         case BT_SBC_SAMPLING_FREQ_48000:
 232             switch (mode) {
 233                 case BT_A2DP_CHANNEL_MODE_MONO:
 234                 case BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL:
 235                     return 29;
 236                 case BT_A2DP_CHANNEL_MODE_STEREO:
 237                 case BT_A2DP_CHANNEL_MODE_JOINT_STEREO:
 238                     return 51;
 239                 default:
 240                     pa_log_warn("Invalid channel mode %u", mode);
 241                     return 51;
 242             }
 243         default:
 244             pa_log_warn("Invalid sampling freq %u", freq);
 245             return 53;
 246     }
 247 }
 248
 249 static int bt_a2dp_init(struct userdata *u) {
 250     sbc_capabilities_t *cap = &u->a2dp.sbc_capabilities;
 251     unsigned int max_bitpool, min_bitpool;
 252
 253     switch (u->rate) {
 254         case 48000:
 255             cap->frequency = BT_SBC_SAMPLING_FREQ_48000;
 256             break;
 257         case 44100:
 258             cap->frequency = BT_SBC_SAMPLING_FREQ_44100;
 259             break;
 260         case 32000:
 261             cap->frequency = BT_SBC_SAMPLING_FREQ_32000;
 262             break;
 263         case 16000:
 264             cap->frequency = BT_SBC_SAMPLING_FREQ_16000;
 265             break;
 266         default:
 267             pa_log_error("Rate %d not supported", u->rate);
 268             return -1;
 269     }
 270
 271 //    if (cfg->has_channel_mode)
 272 //        cap->channel_mode = cfg->channel_mode;
 273 //    else
 274     if (u->channels == 2) {
 275         if (cap->channel_mode & BT_A2DP_CHANNEL_MODE_JOINT_STEREO)
 276             cap->channel_mode = BT_A2DP_CHANNEL_MODE_JOINT_STEREO;
 277         else if (cap->channel_mode & BT_A2DP_CHANNEL_MODE_STEREO)
 278             cap->channel_mode = BT_A2DP_CHANNEL_MODE_STEREO;
 279         else if (cap->channel_mode & BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL)
 280             cap->channel_mode = BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL;
 281     } else {
 282         if (cap->channel_mode & BT_A2DP_CHANNEL_MODE_MONO)
 283             cap->channel_mode = BT_A2DP_CHANNEL_MODE_MONO;
 284     }
 285
 286     if (!cap->channel_mode) {
 287         pa_log_error("No supported channel modes");
 288         return -1;
 289     }
 290
 291 //    if (cfg->has_block_length)
 292 //        cap->block_length = cfg->block_length;
 293 //    else
 294     if (cap->block_length & BT_A2DP_BLOCK_LENGTH_16)
 295         cap->block_length = BT_A2DP_BLOCK_LENGTH_16;
 296     else if (cap->block_length & BT_A2DP_BLOCK_LENGTH_12)
 297         cap->block_length = BT_A2DP_BLOCK_LENGTH_12;
 298     else if (cap->block_length & BT_A2DP_BLOCK_LENGTH_8)
 299         cap->block_length = BT_A2DP_BLOCK_LENGTH_8;
 300     else if (cap->block_length & BT_A2DP_BLOCK_LENGTH_4)
 301         cap->block_length = BT_A2DP_BLOCK_LENGTH_4;
 302     else {
 303         pa_log_error("No supported block lengths");
 304         return -1;
 305     }
 306
 307 //    if (cfg->has_subbands)
 308 //        cap->subbands = cfg->subbands;
 309     if (cap->subbands & BT_A2DP_SUBBANDS_8)
 310         cap->subbands = BT_A2DP_SUBBANDS_8;
 311     else if (cap->subbands & BT_A2DP_SUBBANDS_4)
 312         cap->subbands = BT_A2DP_SUBBANDS_4;
 313     else {
 314         pa_log_error("No supported subbands");
 315         return -1;
 316     }
 317
 318 //    if (cfg->has_allocation_method)
 319 //        cap->allocation_method = cfg->allocation_method;
 320     if (cap->allocation_method & BT_A2DP_ALLOCATION_LOUDNESS)
 321         cap->allocation_method = BT_A2DP_ALLOCATION_LOUDNESS;
 322     else if (cap->allocation_method & BT_A2DP_ALLOCATION_SNR)
 323         cap->allocation_method = BT_A2DP_ALLOCATION_SNR;
 324
 325 //    if (cfg->has_bitpool)
 326 //        min_bitpool = max_bitpool = cfg->bitpool;
 327 //    else {
 328     min_bitpool = MAX(MIN_BITPOOL, cap->min_bitpool);
 329     max_bitpool = MIN(default_bitpool(cap->frequency, cap->channel_mode), cap->max_bitpool);
 330 //    }
 331
 332     cap->min_bitpool = min_bitpool;
 333     cap->max_bitpool = max_bitpool;
 334
 335     return 0;
 336 }
 337
 338 static void bt_a2dp_setup(struct bt_a2dp *a2dp) {
 339     sbc_capabilities_t active_capabilities = a2dp->sbc_capabilities;
 340
 341     if (a2dp->sbc_initialized)
 342         sbc_reinit(&a2dp->sbc, 0);
 343     else
 344         sbc_init(&a2dp->sbc, 0);
 345     a2dp->sbc_initialized = 1;
 346
 347     if (active_capabilities.frequency & BT_SBC_SAMPLING_FREQ_16000)
 348         a2dp->sbc.frequency = SBC_FREQ_16000;
 349
 350     if (active_capabilities.frequency & BT_SBC_SAMPLING_FREQ_32000)
 351         a2dp->sbc.frequency = SBC_FREQ_32000;
 352
 353     if (active_capabilities.frequency & BT_SBC_SAMPLING_FREQ_44100)
 354         a2dp->sbc.frequency = SBC_FREQ_44100;
 355
 356     if (active_capabilities.frequency & BT_SBC_SAMPLING_FREQ_48000)
 357         a2dp->sbc.frequency = SBC_FREQ_48000;
 358
 359     if (active_capabilities.channel_mode & BT_A2DP_CHANNEL_MODE_MONO)
 360         a2dp->sbc.mode = SBC_MODE_MONO;
 361
 362     if (active_capabilities.channel_mode & BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL)
 363         a2dp->sbc.mode = SBC_MODE_DUAL_CHANNEL;
 364
 365     if (active_capabilities.channel_mode & BT_A2DP_CHANNEL_MODE_STEREO)
 366         a2dp->sbc.mode = SBC_MODE_STEREO;
 367
 368     if (active_capabilities.channel_mode & BT_A2DP_CHANNEL_MODE_JOINT_STEREO)
 369         a2dp->sbc.mode = SBC_MODE_JOINT_STEREO;
 370
 371     a2dp->sbc.allocation = (active_capabilities.allocation_method == BT_A2DP_ALLOCATION_SNR ? SBC_AM_SNR : SBC_AM_LOUDNESS);
 372
 373     switch (active_capabilities.subbands) {
 374         case BT_A2DP_SUBBANDS_4:
 375             a2dp->sbc.subbands = SBC_SB_4;
 376             break;
 377         case BT_A2DP_SUBBANDS_8:
 378             a2dp->sbc.subbands = SBC_SB_8;
 379             break;
 380     }
 381
 382     switch (active_capabilities.block_length) {
 383         case BT_A2DP_BLOCK_LENGTH_4:
 384             a2dp->sbc.blocks = SBC_BLK_4;
 385             break;
 386         case BT_A2DP_BLOCK_LENGTH_8:
 387             a2dp->sbc.blocks = SBC_BLK_8;
 388             break;
 389         case BT_A2DP_BLOCK_LENGTH_12:
 390             a2dp->sbc.blocks = SBC_BLK_12;
 391             break;
 392         case BT_A2DP_BLOCK_LENGTH_16:
 393             a2dp->sbc.blocks = SBC_BLK_16;
 394             break;
 395     }
 396
 397     a2dp->sbc.bitpool = active_capabilities.max_bitpool;
 398     a2dp->codesize = sbc_get_codesize(&a2dp->sbc);
 399     a2dp->count = sizeof(struct rtp_header) + sizeof(struct rtp_payload);
 400 }
 401
 402 static int bt_setconf(struct userdata *u) {
 403     int e;
 404     char buf[BT_AUDIO_IPC_PACKET_SIZE];
 405     bt_audio_rsp_msg_header_t *rsp_hdr = (void*) buf;
 406     struct bt_setconfiguration_req *setconf_req = (void*) buf;
 407     struct bt_setconfiguration_rsp *setconf_rsp = (void*) buf;
 408
 409     if (u->transport == BT_CAPABILITIES_TRANSPORT_A2DP) {
 410         e = bt_a2dp_init(u);
 411         if (e < 0) {
 412             pa_log_error("a2dp_init error");
 413             return e;
 414         }
 415     }
 416
 417     u->ss.format = PA_SAMPLE_S16LE;
 418     u->ss.rate = u->rate;
 419     u->ss.channels = u->channels;
 420
 421     memset(setconf_req, 0, BT_AUDIO_IPC_PACKET_SIZE);
 422     setconf_req->h.msg_type = BT_SETCONFIGURATION_REQ;
 423     strncpy(setconf_req->device, u->addr, 18);
 424     setconf_req->transport = u->transport;
 425     if (u->transport == BT_CAPABILITIES_TRANSPORT_A2DP)
 426         setconf_req->sbc_capabilities = u->a2dp.sbc_capabilities;
 427     setconf_req->access_mode = BT_CAPABILITIES_ACCESS_MODE_WRITE;
 428
 429     e = bt_audioservice_send(u->audioservice_fd, &setconf_req->h);
 430     if (e < 0) {
 431         pa_log_error("failed to send BT_SETCONFIGURATION_REQ");
 432         return e;
 433     }
 434
 435     e = bt_audioservice_expect(u->audioservice_fd, &rsp_hdr->msg_h, BT_SETCONFIGURATION_RSP);
 436     if (e < 0) {
 437         pa_log_error("failed to expect BT_SETCONFIGURATION_RSP");
 438         return e;
 439     }
 440
 441     if (rsp_hdr->posix_errno != 0) {
 442         pa_log_error("BT_SETCONFIGURATION failed : %s(%d)", pa_cstrerror(rsp_hdr->posix_errno), rsp_hdr->posix_errno);
 443         return -rsp_hdr->posix_errno;
 444     }
 445
 446     u->transport = setconf_rsp->transport;
 447     u->link_mtu = setconf_rsp->link_mtu;
 448
 449     /* setup SBC encoder now we agree on parameters */
 450     if (u->transport == BT_CAPABILITIES_TRANSPORT_A2DP) {
 451         bt_a2dp_setup(&u->a2dp);
 452         u->block_size = u->a2dp.codesize;
 453         pa_log/*debug*/("\tallocation=%u\n\tsubbands=%u\n\tblocks=%u\n\tbitpool=%u\n",
 454                 u->a2dp.sbc.allocation, u->a2dp.sbc.subbands, u->a2dp.sbc.blocks, u->a2dp.sbc.bitpool);
 455     }
 456     else
 457         u->block_size = u->link_mtu;
 458
 459     return 0;
 460 }
 461
 462 static int bt_getstreamfd(struct userdata *u) {
 463     int e;
 464 //    uint32_t period_count = io->buffer_size / io->period_size;
 465 //    struct timeval t = { 0, period_count };
 466     char buf[BT_AUDIO_IPC_PACKET_SIZE];
 467     struct bt_streamstart_req *start_req = (void*) buf;
 468     bt_audio_rsp_msg_header_t *rsp_hdr = (void*) buf;
 469     struct bt_streamfd_ind *streamfd_ind = (void*) buf;
 470
 471     memset(start_req, 0, BT_AUDIO_IPC_PACKET_SIZE);
 472     start_req->h.msg_type = BT_STREAMSTART_REQ;
 473
 474     e = bt_audioservice_send(u->audioservice_fd, &start_req->h);
 475     if (e < 0) {
 476         pa_log_error("failed to send BT_STREAMSTART_REQ");
 477         return e;
 478     }
 479
 480     e = bt_audioservice_expect(u->audioservice_fd, &rsp_hdr->msg_h, BT_STREAMSTART_RSP);
 481     if (e < 0) {
 482         pa_log_error("failed to expect BT_STREAMSTART_RSP");
 483         return e;
 484     }
 485
 486     if (rsp_hdr->posix_errno != 0) {
 487         pa_log_error("BT_START failed : %s(%d)", pa_cstrerror(rsp_hdr->posix_errno), rsp_hdr->posix_errno);
 488         return -rsp_hdr->posix_errno;
 489     }
 490
 491     e = bt_audioservice_expect(u->audioservice_fd, &streamfd_ind->h, BT_STREAMFD_IND);
 492     if (e < 0) {
 493         pa_log_error("failed to expect BT_STREAMFD_IND");
 494         return e;
 495     }
 496
 497     if (u->stream_fd >= 0)
 498         pa_close(u->stream_fd);
 499
 500     u->stream_fd = bt_audio_service_get_data_fd(u->audioservice_fd);
 501     if (u->stream_fd < 0) {
 502         pa_log_error("failed to get data fd: %s (%d)",pa_cstrerror(errno), errno);
 503         return -errno;
 504     }
 505
 506 //    if (u->transport == BT_CAPABILITIES_TRANSPORT_A2DP) {
 507 //        if (setsockopt(u->stream_fd, SOL_SOCKET, SO_SNDTIMEO, &t, sizeof(t)) < 0) {
 508 //            pa_log_error("failed to set socket options for A2DP: %s (%d)",pa_cstrerror(errno), errno);
 509 //            return -errno;
 510 //        }
 511 //    }
 512 //    else {
 513 //        if (setsockopt(u->stream_fd, SOL_SCO, SCO_TXBUFS, &period_count, sizeof(period_count)) == 0)
 514 //            return 0;
 515 //        if (setsockopt(u->stream_fd, SOL_SCO, SO_SNDBUF, &period_count, sizeof(period_count)) == 0)
 516 //            return 0;
 517 //        /* FIXME : handle error codes */
 518 //    }
 519     pa_make_fd_nonblock(u->stream_fd);
 520
 521     return 0;
 522 }
 523
 524 static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
 525     struct userdata *u = PA_SINK(o)->userdata;
 526
 527     pa_log/*_debug*/("got message: %d", code);
 528     switch (code) {
 529
 530         case PA_SINK_MESSAGE_SET_STATE:
 531             switch ((pa_sink_state_t) PA_PTR_TO_UINT(data)) {
 532                 case PA_SINK_SUSPENDED:
 533                     pa_assert(PA_SINK_IS_OPENED(u->sink->thread_info.state));
 534                     pa_smoother_pause(u->smoother, pa_rtclock_usec());
 535                     break;
 536                 case PA_SINK_IDLE:
 537                 case PA_SINK_RUNNING:
 538                     if (u->sink->thread_info.state == PA_SINK_SUSPENDED)
 539                         pa_smoother_resume(u->smoother, pa_rtclock_usec());
 540                     break;
 541                 case PA_SINK_UNLINKED:
 542                 case PA_SINK_INIT:
 543                     ;
 544             }
 545             break;
 546
 547         case PA_SINK_MESSAGE_GET_LATENCY: {
 548             pa_usec_t w, r;
 549             r = pa_smoother_get(u->smoother, pa_rtclock_usec());
 550             w = pa_bytes_to_usec(u->offset + u->memchunk.length, &u->sink->sample_spec);
 551             *((pa_usec_t*) data) = w > r ? w - r : 0;
 552             return 0;
 553         }
 554
 555     }
 556
 557     return pa_sink_process_msg(o, code, data, offset, chunk);
 558 }
 559
 560 static void thread_func(void *userdata) {
 561     struct userdata *u = userdata;
 562     int write_type = 0;
 563
 564     pa_assert(u);
 565
 566     pa_log/*_debug*/("Thread starting up");
 567
 568     pa_thread_mq_install(&u->thread_mq);
 569     pa_rtpoll_install(u->rtpoll);
 570
 571     pa_smoother_set_time_offset(u->smoother, pa_rtclock_usec());
 572
 573     for (;;) {
 574         int ret;
 575         struct pollfd *pollfd;
 576
 577         if (PA_SINK_IS_OPENED(u->sink->thread_info.state)) {
 578             if (u->sink->thread_info.rewind_requested) {
 579                 pa_log("rewind_requested");
 580                 pa_sink_process_rewind(u->sink, 0);
 581                 pa_log("rewind_finished");
 582             }
 583         }
 584
 585         pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 586
 587         /* Render some data and write it to the fifo */
 588         if (PA_SINK_IS_OPENED(u->sink->thread_info.state) && pollfd->revents) {
 589             pa_usec_t usec;
 590             int64_t n;
 591             pa_log("Render some data and write it to the fifo");
 592
 593             for (;;) {
 594                 ssize_t l;
 595                 void *p;
 596
 597                 u->memchunk.memblock = pa_memblock_new(u->mempool, u->block_size);
 598                 pa_log("memblock allocated");
 599                 u->memchunk.length = pa_memblock_get_length(u->memchunk.memblock);
 600                 pa_log("memchunk length");
 601                 pa_sink_render_into_full(u->sink, &u->memchunk);
 602                 pa_log("rendered");
 603
 604                 pa_assert(u->memchunk.length > 0);
 605
 606                 p = pa_memblock_acquire(u->memchunk.memblock);
 607                 pa_log("memblock acquired");
 608                 l = pa_write(u->stream_fd, (uint8_t*) p, u->memchunk.length, &write_type);
 609                 pa_log("memblock written");
 610                 pa_memblock_release(u->memchunk.memblock);
 611                 pa_log("memblock released");
 612
 613                 pa_assert(l != 0);
 614
 615                 if (l < 0) {
 616                     pa_log("l = %d < 0", l);
 617                     if (errno == EINTR)
 618                         continue;
 619                     else if (errno == EAGAIN)
 620                         goto filled_up;
 621                     else {
 622                         pa_log("Failed to write data to FIFO: %s", pa_cstrerror(errno));
 623                         goto fail;
 624                     }
 625                 } else {
 626                     pa_log("l = %d >= 0", l);
 627                     u->offset += l;
 628                     pa_memblock_unref(u->memchunk.memblock);
 629                     pa_log("memblock unrefered");
 630                     pa_memchunk_reset(&u->memchunk);
 631                     pa_log("memchunk reseted");
 632                     pollfd->revents = 0;
 633                 }
 634             }
 635
 636 filled_up:
 637
 638             pa_log("filled_up");
 639             /* At this spot we know that the socket buffers are fully filled up.
 640              * This is the best time to estimate the playback position of the server */
 641             n = u->offset;
 642
 643 #ifdef SIOCOUTQ
 644             {
 645                 int l;
 646                 if (ioctl(u->fd, SIOCOUTQ, &l) >= 0 && l > 0)
 647                     n -= l;
 648             }
 649 #endif
 650
 651             usec = pa_bytes_to_usec(n, &u->sink->sample_spec);
 652             if (usec > u->latency)
 653                 usec -= u->latency;
 654             else
 655                 usec = 0;
 656             pa_smoother_put(u->smoother, pa_rtclock_usec(), usec);
 657         }
 658
 659         /* Hmm, nothing to do. Let's sleep */
 660         pa_log("let's sleep");
 661         pollfd->events = PA_SINK_IS_OPENED(u->sink->thread_info.state) ? POLLOUT : 0;
 662
 663         if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0) {
 664             pa_log("ret < 0");
 665             goto fail;
 666         }
 667         pa_log("waking up");
 668
 669         if (ret == 0) {
 670             pa_log("ret == 0");
 671             goto finish;
 672         }
 673
 674         pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 675         if (pollfd->revents & ~POLLOUT) {
 676             pa_log("FIFO shutdown.");
 677             goto fail;
 678         }
 679     }
 680
 681 fail:
 682     /* If this was no regular exit from the loop we have to continue processing messages until we receive PA_MESSAGE_SHUTDOWN */
 683     pa_log("fail");
 684     pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
 685     pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
 686
 687 finish:
 688     pa_log_debug("Thread shutting down");
 689 }
 690
 691 int pa__init(pa_module* m) {
 692     int e;
 693     const char *rate, *channels;
 694     pa_modargs *ma;
 695     pa_sink_new_data data;
 696     struct pollfd *pollfd;
 697     struct userdata *u;
 698
 699     pa_assert(m);
 700     m->userdata = u = pa_xnew0(struct userdata, 1);
 701     u->module = m;
 702     u->core = m->core;
 703     u->audioservice_fd = -1;
 704     u->stream_fd = -1;
 705     u->transport = -1;
 706     u->offset = 0;
 707     u->latency = 0;
 708     u->a2dp.sbc_initialized = 0;
 709     u->smoother = pa_smoother_new(PA_USEC_PER_SEC, PA_USEC_PER_SEC*2, TRUE, 10);
 710     u->mempool = pa_mempool_new(FALSE);
 711     pa_memchunk_reset(&u->memchunk);
 712     u->rtpoll = pa_rtpoll_new();
 713     pa_thread_mq_init(&u->thread_mq, u->core->mainloop, u->rtpoll);
 714     u->rtpoll_item = NULL;
 715
 716     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 717         pa_log_error("failed to parse module arguments");
 718         goto fail;
 719     }
 720     if (!(u->name = pa_xstrdup(pa_modargs_get_value(ma, "name", DEFAULT_SINK_NAME)))) {
 721         pa_log_error("failed to get device name from module arguments");
 722         goto fail;
 723     }
 724     if (!(u->addr = pa_xstrdup(pa_modargs_get_value(ma, "addr", NULL)))) {
 725         pa_log_error("failed to get device address from module arguments");
 726         goto fail;
 727     }
 728     if (!(u->profile = pa_xstrdup(pa_modargs_get_value(ma, "profile", NULL)))) {
 729         pa_log_error("failed to get profile from module arguments");
 730         goto fail;
 731     }
 732     if (pa_modargs_get_value_u32(ma, "rate", &u->rate) < 0) {
 733         pa_log_error("failed to get rate from module arguments");
 734         goto fail;
 735     }
 736     if (pa_modargs_get_value_u32(ma, "channels", &u->channels) < 0) {
 737         pa_log_error("failed to get channels from module arguments");
 738         goto fail;
 739     }
 740     pa_log("Loading module-bt-device for %s (%s), profile %s", u->name, u->addr, u->profile);
 741
 742     /* connect to the bluez audio service */
 743     u->audioservice_fd = bt_audio_service_open();
 744     if (u->audioservice_fd <= 0) {
 745         pa_log_error("couldn't connect to bluetooth audio service");
 746         goto fail;
 747     }
 748
 749     /* queries device capabilities */
 750     e = bt_getcaps(u);
 751     if (e < 0) {
 752         pa_log_error("failed to get device capabilities");
 753         goto fail;
 754     }
 755
 756     /* configures the connection */
 757     e = bt_setconf(u);
 758     if (e < 0) {
 759         pa_log_error("failed to set config");
 760         goto fail;
 761     }
 762
 763     /* gets the device socket */
 764     e = bt_getstreamfd(u);
 765     if (e < 0) {
 766         pa_log_error("failed to get stream fd (%d)", e);
 767         goto fail;
 768     }
 769
 770     /* create sink */
 771     pa_sink_new_data_init(&data);
 772     data.driver = __FILE__;
 773     data.module = m;
 774     pa_sink_new_data_set_name(&data, u->name);
 775     pa_sink_new_data_set_sample_spec(&data, &u->ss);
 776     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, u->name);
 777     pa_proplist_setf(data.proplist, PA_PROP_DEVICE_DESCRIPTION, "Bluetooth sink '%s' (%s)", u->name, u->addr);
 778     u->sink = pa_sink_new(m->core, &data, PA_SINK_HARDWARE|PA_SINK_LATENCY);
 779     pa_sink_new_data_done(&data);
 780     if (!u->sink) {
 781         pa_log_error("failed to create sink");
 782         goto fail;
 783     }
 784     u->sink->userdata = u;
 785     u->sink->parent.process_msg = sink_process_msg;
 786     pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
 787     pa_sink_set_rtpoll(u->sink, u->rtpoll);
 788
 789     u->rtpoll_item = pa_rtpoll_item_new(u->rtpoll, PA_RTPOLL_NEVER, 1);
 790     pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 791     pollfd->fd = u->stream_fd;
 792     pollfd->events = pollfd->revents = 0;
 793
 794     /* start rt thread */
 795     if (!(u->thread = pa_thread_new(thread_func, u))) {
 796         pa_log_error("failed to create thread");
 797         goto fail;
 798     }
 799     pa_sink_put(u->sink);
 800
 801     pa_modargs_free(ma);
 802     return 0;
 803
 804 fail:
 805     if (ma)
 806         pa_modargs_free(ma);
 807     pa__done(m);
 808     return -1;
 809 }
 810
 811 void pa__done(pa_module *m) {
 812     pa_log("Unloading module-bt-device");
 813 }
 814