pulseaudio/src/modules/bluetooth/module-bluetooth-device.c

/***
  This file is part of PulseAudio.

  Copyright 2008-2009 Joao Paulo Rechi Vita
  Copyright 2011-2012 BMW Car IT GmbH.

  PulseAudio is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as
  published by the Free Software Foundation; either version 2.1 of the
  License, or (at your option) any later version.

  PulseAudio is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with PulseAudio; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA.
***/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <string.h>
#include <errno.h>
#include <linux/sockios.h>
#include <arpa/inet.h>

#include <pulse/rtclock.h>
#include <pulse/sample.h>
#include <pulse/timeval.h>
#include <pulse/xmalloc.h>

#include <pulsecore/i18n.h>
#include <pulsecore/module.h>
#include <pulsecore/modargs.h>
#include <pulsecore/core-rtclock.h>
#include <pulsecore/core-util.h>
#include <pulsecore/core-error.h>
#include <pulsecore/shared.h>
#include <pulsecore/socket-util.h>
#include <pulsecore/thread.h>
#include <pulsecore/thread-mq.h>
#include <pulsecore/poll.h>
#include <pulsecore/rtpoll.h>
#include <pulsecore/time-smoother.h>
#include <pulsecore/namereg.h>
#include <pulsecore/dbus-shared.h>

#include <sbc/sbc.h>

#include "module-bluetooth-device-symdef.h"
#include "ipc.h"
#include "a2dp-codecs.h"
#include "rtp.h"
#include "bluetooth-util.h"

#define BITPOOL_DEC_LIMIT 32
#define BITPOOL_DEC_STEP 5
#define HSP_MAX_GAIN 15

PA_MODULE_AUTHOR("Joao Paulo Rechi Vita");
PA_MODULE_DESCRIPTION("Bluetooth audio sink and source");
PA_MODULE_VERSION(PACKAGE_VERSION);
PA_MODULE_LOAD_ONCE(FALSE);
PA_MODULE_USAGE(
        "name=<name for the card/sink/source, to be prefixed> "
        "card_name=<name for the card> "
        "card_properties=<properties for the card> "
        "sink_name=<name for the sink> "
        "sink_properties=<properties for the sink> "
        "source_name=<name for the source> "
        "source_properties=<properties for the source> "
        "address=<address of the device> "
        "profile=<a2dp|hsp|hfgw> "
        "rate=<sample rate> "
        "channels=<number of channels> "
        "path=<device object path> "
        "auto_connect=<automatically connect?> "
        "sco_sink=<SCO over PCM sink name> "
        "sco_source=<SCO over PCM source name>");

/* TODO: not close fd when entering suspend mode in a2dp */

static const char* const valid_modargs[] = {
    "name",
    "card_name",
    "card_properties",
    "sink_name",
    "sink_properties",
    "source_name",
    "source_properties",
    "address",
    "profile",
    "rate",
    "channels",
    "path",
    "auto_connect",
    "sco_sink",
    "sco_source",
    NULL
};

struct a2dp_info {
    sbc_capabilities_t sbc_capabilities;
    sbc_t sbc;                           /* Codec data */
    pa_bool_t sbc_initialized;           /* Keep track if the encoder is initialized */
    size_t codesize, frame_length;       /* SBC Codesize, frame_length. We simply cache those values here */

    void* buffer;                        /* Codec transfer buffer */
    size_t buffer_size;                  /* Size of the buffer */

    uint16_t seq_num;                    /* Cumulative packet sequence */
    uint8_t min_bitpool;
    uint8_t max_bitpool;
};

struct hsp_info {
    pcm_capabilities_t pcm_capabilities;
    pa_sink *sco_sink;
    void (*sco_sink_set_volume)(pa_sink *s);
    pa_source *sco_source;
    void (*sco_source_set_volume)(pa_source *s);
    pa_hook_slot *sink_state_changed_slot;
    pa_hook_slot *source_state_changed_slot;
    pa_hook_slot *nrec_changed_slot;
};

struct bluetooth_msg {
    pa_msgobject parent;
    pa_card *card;
};

typedef struct bluetooth_msg bluetooth_msg;
PA_DEFINE_PRIVATE_CLASS(bluetooth_msg, pa_msgobject);
#define BLUETOOTH_MSG(o) (bluetooth_msg_cast(o))

struct userdata {
    pa_core *core;
    pa_module *module;

    char *address;
    char *path;
    char *transport;
    char *accesstype;

    pa_bluetooth_discovery *discovery;
    pa_bool_t auto_connect;

    pa_dbus_connection *connection;

    pa_card *card;
    pa_sink *sink;
    pa_source *source;

    pa_thread_mq thread_mq;
    pa_rtpoll *rtpoll;
    pa_rtpoll_item *rtpoll_item;
    pa_thread *thread;
    bluetooth_msg *msg;

    uint64_t read_index, write_index;
    pa_usec_t started_at;
    pa_smoother *read_smoother;

    pa_memchunk write_memchunk;

    pa_sample_spec sample_spec, requested_sample_spec;

    int stream_fd;

    size_t read_link_mtu;
    size_t read_block_size;

    size_t write_link_mtu;
    size_t write_block_size;

    struct a2dp_info a2dp;
    struct hsp_info hsp;

    enum profile profile;

    pa_modargs *modargs;

    int stream_write_type;

    pa_bool_t filter_added;
};

enum {
    BLUETOOTH_MESSAGE_IO_THREAD_FAILED,
    BLUETOOTH_MESSAGE_MAX
};

#define FIXED_LATENCY_PLAYBACK_A2DP (25*PA_USEC_PER_MSEC)
#define FIXED_LATENCY_RECORD_A2DP (25*PA_USEC_PER_MSEC)
#define FIXED_LATENCY_PLAYBACK_HSP (125*PA_USEC_PER_MSEC)
#define FIXED_LATENCY_RECORD_HSP (25*PA_USEC_PER_MSEC)

#define MAX_PLAYBACK_CATCH_UP_USEC (100*PA_USEC_PER_MSEC)

#define USE_SCO_OVER_PCM(u) (u->profile == PROFILE_HSP && (u->hsp.sco_sink && u->hsp.sco_source))

static int init_profile(struct userdata *u);

/* from IO thread */
static void a2dp_set_bitpool(struct userdata *u, uint8_t bitpool)
{
    struct a2dp_info *a2dp;

    pa_assert(u);

    a2dp = &u->a2dp;

    if (a2dp->sbc.bitpool == bitpool)
        return;

    if (bitpool > a2dp->max_bitpool)
        bitpool = a2dp->max_bitpool;
    else if (bitpool < a2dp->min_bitpool)
        bitpool = a2dp->min_bitpool;

    a2dp->sbc.bitpool = bitpool;

    a2dp->codesize = sbc_get_codesize(&a2dp->sbc);
    a2dp->frame_length = sbc_get_frame_length(&a2dp->sbc);

    pa_log_debug("Bitpool has changed to %u", a2dp->sbc.bitpool);

    u->read_block_size =
        (u->read_link_mtu - sizeof(struct rtp_header) - sizeof(struct rtp_payload))
        / a2dp->frame_length * a2dp->codesize;

    u->write_block_size =
        (u->write_link_mtu - sizeof(struct rtp_header) - sizeof(struct rtp_payload))
        / a2dp->frame_length * a2dp->codesize;

    pa_sink_set_max_request_within_thread(u->sink, u->write_block_size);
    pa_sink_set_fixed_latency_within_thread(u->sink,
            FIXED_LATENCY_PLAYBACK_A2DP + pa_bytes_to_usec(u->write_block_size, &u->sample_spec));
}

/* from IO thread, except in SCO over PCM */

static void setup_stream(struct userdata *u) {
    struct pollfd *pollfd;
    int one;

    pa_make_fd_nonblock(u->stream_fd);
    pa_make_socket_low_delay(u->stream_fd);

    one = 1;
    if (setsockopt(u->stream_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one)) < 0)
        pa_log_warn("Failed to enable SO_TIMESTAMP: %s", pa_cstrerror(errno));

    pa_log_debug("Stream properly set up, we're ready to roll!");

    if (u->profile == PROFILE_A2DP)
        a2dp_set_bitpool(u, u->a2dp.max_bitpool);

    u->rtpoll_item = pa_rtpoll_item_new(u->rtpoll, PA_RTPOLL_NEVER, 1);
    pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
    pollfd->fd = u->stream_fd;
    pollfd->events = pollfd->revents = 0;

    u->read_index = u->write_index = 0;
    u->started_at = 0;

    if (u->source)
        u->read_smoother = pa_smoother_new(
                PA_USEC_PER_SEC,
                PA_USEC_PER_SEC*2,
                TRUE,
                TRUE,
                10,
                pa_rtclock_now(),
                TRUE);
}

static bool bt_transport_is_acquired(struct userdata *u) {
    if (u->accesstype == NULL) {
        pa_assert(u->stream_fd < 0);
        return FALSE;
    } else {
        pa_assert(u->stream_fd >= 0);
        return TRUE;
    }
}

static void bt_transport_release(struct userdata *u) {
    const char *accesstype = "rw";
    const pa_bluetooth_transport *t;

    /* Ignore if already released */
    if (!bt_transport_is_acquired(u))
        return;

    pa_log_debug("Releasing transport %s", u->transport);

    t = pa_bluetooth_discovery_get_transport(u->discovery, u->transport);
    if (t)
        pa_bluetooth_transport_release(t, accesstype);

    pa_xfree(u->accesstype);
    u->accesstype = NULL;

    if (u->rtpoll_item) {
        pa_rtpoll_item_free(u->rtpoll_item);
        u->rtpoll_item = NULL;
    }

    if (u->stream_fd >= 0) {
        pa_close(u->stream_fd);
        u->stream_fd = -1;
    }

    if (u->read_smoother) {
        pa_smoother_free(u->read_smoother);
        u->read_smoother = NULL;
    }
}

static int bt_transport_acquire(struct userdata *u, pa_bool_t start) {
    const char *accesstype = "rw";
    const pa_bluetooth_transport *t;

    if (bt_transport_is_acquired(u)) {
        if (start)
            goto done;
        return 0;
    }

    pa_log_debug("Acquiring transport %s", u->transport);

    t = pa_bluetooth_discovery_get_transport(u->discovery, u->transport);
    if (!t) {
        pa_log("Transport %s no longer available", u->transport);
        pa_xfree(u->transport);
        u->transport = NULL;
        return -1;
    }

    u->stream_fd = pa_bluetooth_transport_acquire(t, accesstype, &u->read_link_mtu, &u->write_link_mtu);
    if (u->stream_fd < 0)
        return -1;

    u->accesstype = pa_xstrdup(accesstype);
    pa_log_info("Transport %s acquired: fd %d", u->transport, u->stream_fd);

    if (!start)
        return 0;

done:
    pa_log_info("Transport %s resuming", u->transport);
    setup_stream(u);

    return 0;
}

/* Run from IO thread */
static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
    struct userdata *u = PA_SINK(o)->userdata;
    pa_bool_t failed = FALSE;
    int r;

    pa_assert(u->sink == PA_SINK(o));
    pa_assert(u->transport);

    switch (code) {

        case PA_SINK_MESSAGE_SET_STATE:

            switch ((pa_sink_state_t) PA_PTR_TO_UINT(data)) {

                case PA_SINK_SUSPENDED:
                    pa_assert(PA_SINK_IS_OPENED(u->sink->thread_info.state));

                    /* Stop the device if the source is suspended as well */
                    if (!u->source || u->source->state == PA_SOURCE_SUSPENDED)
                        /* We deliberately ignore whether stopping
                         * actually worked. Since the stream_fd is
                         * closed it doesn't really matter */
                        bt_transport_release(u);

                    break;

                case PA_SINK_IDLE:
                case PA_SINK_RUNNING:
                    if (u->sink->thread_info.state != PA_SINK_SUSPENDED)
                        break;

                    /* Resume the device if the source was suspended as well */
                    if (!u->source || u->source->state == PA_SOURCE_SUSPENDED) {
                        if (bt_transport_acquire(u, TRUE) < 0)
                            failed = TRUE;
                    }
                    break;

                case PA_SINK_UNLINKED:
                case PA_SINK_INIT:
                case PA_SINK_INVALID_STATE:
                    ;
            }
            break;

        case PA_SINK_MESSAGE_GET_LATENCY: {

            if (u->read_smoother) {
                pa_usec_t wi, ri;

                ri = pa_smoother_get(u->read_smoother, pa_rtclock_now());
                wi = pa_bytes_to_usec(u->write_index + u->write_block_size, &u->sample_spec);

                *((pa_usec_t*) data) = wi > ri ? wi - ri : 0;
            } else {
                pa_usec_t ri, wi;

                ri = pa_rtclock_now() - u->started_at;
                wi = pa_bytes_to_usec(u->write_index, &u->sample_spec);

                *((pa_usec_t*) data) = wi > ri ? wi - ri : 0;
            }

            *((pa_usec_t*) data) += u->sink->thread_info.fixed_latency;
            return 0;
        }
    }

    r = pa_sink_process_msg(o, code, data, offset, chunk);

    return (r < 0 || !failed) ? r : -1;
}

/* Run from IO thread */
static int source_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
    struct userdata *u = PA_SOURCE(o)->userdata;
    pa_bool_t failed = FALSE;
    int r;

    pa_assert(u->source == PA_SOURCE(o));
    pa_assert(u->transport);

    switch (code) {

        case PA_SOURCE_MESSAGE_SET_STATE:

            switch ((pa_source_state_t) PA_PTR_TO_UINT(data)) {

                case PA_SOURCE_SUSPENDED:
                    pa_assert(PA_SOURCE_IS_OPENED(u->source->thread_info.state));

                    /* Stop the device if the sink is suspended as well */
                    if (!u->sink || u->sink->state == PA_SINK_SUSPENDED)
                        bt_transport_release(u);

                    if (u->read_smoother)
                        pa_smoother_pause(u->read_smoother, pa_rtclock_now());
                    break;

                case PA_SOURCE_IDLE:
                case PA_SOURCE_RUNNING:
                    if (u->source->thread_info.state != PA_SOURCE_SUSPENDED)
                        break;

                    /* Resume the device if the sink was suspended as well */
                    if (!u->sink || u->sink->thread_info.state == PA_SINK_SUSPENDED) {
                        if (bt_transport_acquire(u, TRUE) < 0)
                            failed = TRUE;
                    }
                    /* We don't resume the smoother here. Instead we
                     * wait until the first packet arrives */
                    break;

                case PA_SOURCE_UNLINKED:
                case PA_SOURCE_INIT:
                case PA_SOURCE_INVALID_STATE:
                    ;
            }
            break;

        case PA_SOURCE_MESSAGE_GET_LATENCY: {
            pa_usec_t wi, ri;

            if (u->read_smoother) {
                wi = pa_smoother_get(u->read_smoother, pa_rtclock_now());
                ri = pa_bytes_to_usec(u->read_index, &u->sample_spec);

                *((pa_usec_t*) data) = (wi > ri ? wi - ri : 0) + u->source->thread_info.fixed_latency;
            } else
                *((pa_usec_t*) data) = 0;

            return 0;
        }

    }

    r = pa_source_process_msg(o, code, data, offset, chunk);

    return (r < 0 || !failed) ? r : -1;
}

/* Called from main thread context */
static int device_process_msg(pa_msgobject *obj, int code, void *data, int64_t offset, pa_memchunk *chunk) {
    struct bluetooth_msg *u = BLUETOOTH_MSG(obj);

    switch (code) {
        case BLUETOOTH_MESSAGE_IO_THREAD_FAILED: {
            if (u->card->module->unload_requested)
                break;

            pa_log_debug("Switching the profile to off due to IO thread failure.");

            if (pa_card_set_profile(u->card, "off", FALSE) < 0)
                pa_log_debug("Failed to switch profile to off");
            break;
        }
    }
    return 0;
}

/* Run from IO thread */
static int hsp_process_render(struct userdata *u) {
    int ret = 0;

    pa_assert(u);
    pa_assert(u->profile == PROFILE_HSP || u->profile == PROFILE_HFGW);
    pa_assert(u->sink);

    /* First, render some data */
    if (!u->write_memchunk.memblock)
        pa_sink_render_full(u->sink, u->write_block_size, &u->write_memchunk);

    pa_assert(u->write_memchunk.length == u->write_block_size);

    for (;;) {
        ssize_t l;
        const void *p;

        /* Now write that data to the socket. The socket is of type
         * SEQPACKET, and we generated the data of the MTU size, so this
         * should just work. */

        p = (const uint8_t *) pa_memblock_acquire_chunk(&u->write_memchunk);
        l = pa_write(u->stream_fd, p, u->write_memchunk.length, &u->stream_write_type);
        pa_memblock_release(u->write_memchunk.memblock);

        pa_assert(l != 0);

        if (l < 0) {

            if (errno == EINTR)
                /* Retry right away if we got interrupted */
                continue;

            else if (errno == EAGAIN)
                /* Hmm, apparently the socket was not writable, give up for now */
                break;

            pa_log_error("Failed to write data to SCO socket: %s", pa_cstrerror(errno));
            ret = -1;
            break;
        }

        pa_assert((size_t) l <= u->write_memchunk.length);

        if ((size_t) l != u->write_memchunk.length) {
            pa_log_error("Wrote memory block to socket only partially! %llu written, wanted to write %llu.",
                        (unsigned long long) l,
                        (unsigned long long) u->write_memchunk.length);
            ret = -1;
            break;
        }

        u->write_index += (uint64_t) u->write_memchunk.length;
        pa_memblock_unref(u->write_memchunk.memblock);
        pa_memchunk_reset(&u->write_memchunk);

        ret = 1;
        break;
    }

    return ret;
}

/* Run from IO thread */
static int hsp_process_push(struct userdata *u) {
    int ret = 0;
    pa_memchunk memchunk;

    pa_assert(u);
    pa_assert(u->profile == PROFILE_HSP || u->profile == PROFILE_HFGW);
    pa_assert(u->source);
    pa_assert(u->read_smoother);

    memchunk.memblock = pa_memblock_new(u->core->mempool, u->read_block_size);
    memchunk.index = memchunk.length = 0;

    for (;;) {
        ssize_t l;
        void *p;
        struct msghdr m;
        struct cmsghdr *cm;
        uint8_t aux[1024];
        struct iovec iov;
        pa_bool_t found_tstamp = FALSE;
        pa_usec_t tstamp;

        memset(&m, 0, sizeof(m));
        memset(&aux, 0, sizeof(aux));
        memset(&iov, 0, sizeof(iov));

        m.msg_iov = &iov;
        m.msg_iovlen = 1;
        m.msg_control = aux;
        m.msg_controllen = sizeof(aux);

        p = pa_memblock_acquire(memchunk.memblock);
        iov.iov_base = p;
        iov.iov_len = pa_memblock_get_length(memchunk.memblock);
        l = recvmsg(u->stream_fd, &m, 0);
        pa_memblock_release(memchunk.memblock);

        if (l <= 0) {

            if (l < 0 && errno == EINTR)
                /* Retry right away if we got interrupted */
                continue;

            else if (l < 0 && errno == EAGAIN)
                /* Hmm, apparently the socket was not readable, give up for now. */
                break;

            pa_log_error("Failed to read data from SCO socket: %s", l < 0 ? pa_cstrerror(errno) : "EOF");
            ret = -1;
            break;
        }

        pa_assert((size_t) l <= pa_memblock_get_length(memchunk.memblock));

        memchunk.length = (size_t) l;
        u->read_index += (uint64_t) l;

        for (cm = CMSG_FIRSTHDR(&m); cm; cm = CMSG_NXTHDR(&m, cm))
            if (cm->cmsg_level == SOL_SOCKET && cm->cmsg_type == SO_TIMESTAMP) {
                struct timeval *tv = (struct timeval*) CMSG_DATA(cm);
                pa_rtclock_from_wallclock(tv);
                tstamp = pa_timeval_load(tv);
                found_tstamp = TRUE;
                break;
            }

        if (!found_tstamp) {
            pa_log_warn("Couldn't find SO_TIMESTAMP data in auxiliary recvmsg() data!");
            tstamp = pa_rtclock_now();
        }

        pa_smoother_put(u->read_smoother, tstamp, pa_bytes_to_usec(u->read_index, &u->sample_spec));
        pa_smoother_resume(u->read_smoother, tstamp, TRUE);

        pa_source_post(u->source, &memchunk);

        ret = l;
        break;
    }

    pa_memblock_unref(memchunk.memblock);

    return ret;
}

/* Run from IO thread */
static void a2dp_prepare_buffer(struct userdata *u) {
    size_t min_buffer_size = PA_MAX(u->read_link_mtu, u->write_link_mtu);

    pa_assert(u);

    if (u->a2dp.buffer_size >= min_buffer_size)
        return;

    u->a2dp.buffer_size = 2 * min_buffer_size;
    pa_xfree(u->a2dp.buffer);
    u->a2dp.buffer = pa_xmalloc(u->a2dp.buffer_size);
}

/* Run from IO thread */
static int a2dp_process_render(struct userdata *u) {
    struct a2dp_info *a2dp;
    struct rtp_header *header;
    struct rtp_payload *payload;
    size_t nbytes;
    void *d;
    const void *p;
    size_t to_write, to_encode;
    unsigned frame_count;
    int ret = 0;

    pa_assert(u);
    pa_assert(u->profile == PROFILE_A2DP);
    pa_assert(u->sink);

    /* First, render some data */
    if (!u->write_memchunk.memblock)
        pa_sink_render_full(u->sink, u->write_block_size, &u->write_memchunk);

    pa_assert(u->write_memchunk.length == u->write_block_size);

    a2dp_prepare_buffer(u);

    a2dp = &u->a2dp;
    header = a2dp->buffer;
    payload = (struct rtp_payload*) ((uint8_t*) a2dp->buffer + sizeof(*header));

    frame_count = 0;

    /* Try to create a packet of the full MTU */

    p = (const uint8_t *) pa_memblock_acquire_chunk(&u->write_memchunk);
    to_encode = u->write_memchunk.length;

    d = (uint8_t*) a2dp->buffer + sizeof(*header) + sizeof(*payload);
    to_write = a2dp->buffer_size - sizeof(*header) - sizeof(*payload);

    while (PA_LIKELY(to_encode > 0 && to_write > 0)) {
        ssize_t written;
        ssize_t encoded;

        encoded = sbc_encode(&a2dp->sbc,
                             p, to_encode,
                             d, to_write,
                             &written);

        if (PA_UNLIKELY(encoded <= 0)) {
            pa_log_error("SBC encoding error (%li)", (long) encoded);
            pa_memblock_release(u->write_memchunk.memblock);
            return -1;
        }

/*         pa_log_debug("SBC: encoded: %lu; written: %lu", (unsigned long) encoded, (unsigned long) written); */
/*         pa_log_debug("SBC: codesize: %lu; frame_length: %lu", (unsigned long) a2dp->codesize, (unsigned long) a2dp->frame_length); */

        pa_assert_fp((size_t) encoded <= to_encode);
        pa_assert_fp((size_t) encoded == a2dp->codesize);

        pa_assert_fp((size_t) written <= to_write);
        pa_assert_fp((size_t) written == a2dp->frame_length);

        p = (const uint8_t*) p + encoded;
        to_encode -= encoded;

        d = (uint8_t*) d + written;
        to_write -= written;

        frame_count++;
    }

    pa_memblock_release(u->write_memchunk.memblock);

    pa_assert(to_encode == 0);

    PA_ONCE_BEGIN {
        pa_log_debug("Using SBC encoder implementation: %s", pa_strnull(sbc_get_implementation_info(&a2dp->sbc)));
    } PA_ONCE_END;

    /* write it to the fifo */
    memset(a2dp->buffer, 0, sizeof(*header) + sizeof(*payload));
    header->v = 2;
    header->pt = 1;
    header->sequence_number = htons(a2dp->seq_num++);
    header->timestamp = htonl(u->write_index / pa_frame_size(&u->sample_spec));
    header->ssrc = htonl(1);
    payload->frame_count = frame_count;

    nbytes = (uint8_t*) d - (uint8_t*) a2dp->buffer;

    for (;;) {
        ssize_t l;

        l = pa_write(u->stream_fd, a2dp->buffer, nbytes, &u->stream_write_type);

        pa_assert(l != 0);

        if (l < 0) {

            if (errno == EINTR)
                /* Retry right away if we got interrupted */
                continue;

            else if (errno == EAGAIN)
                /* Hmm, apparently the socket was not writable, give up for now */
                break;

            pa_log_error("Failed to write data to socket: %s", pa_cstrerror(errno));
            ret = -1;
            break;
        }

        pa_assert((size_t) l <= nbytes);

        if ((size_t) l != nbytes) {
            pa_log_warn("Wrote memory block to socket only partially! %llu written, wanted to write %llu.",
                        (unsigned long long) l,
                        (unsigned long long) nbytes);
            ret = -1;
            break;
        }

        u->write_index += (uint64_t) u->write_memchunk.length;
        pa_memblock_unref(u->write_memchunk.memblock);
        pa_memchunk_reset(&u->write_memchunk);

        ret = 1;

        break;
    }

    return ret;
}

static int a2dp_process_push(struct userdata *u) {
    int ret = 0;
    pa_memchunk memchunk;

    pa_assert(u);
    pa_assert(u->profile == PROFILE_A2DP_SOURCE);
    pa_assert(u->source);
    pa_assert(u->read_smoother);

    memchunk.memblock = pa_memblock_new(u->core->mempool, u->read_block_size);
    memchunk.index = memchunk.length = 0;

    for (;;) {
        pa_bool_t found_tstamp = FALSE;
        pa_usec_t tstamp;
        struct a2dp_info *a2dp;
        struct rtp_header *header;
        struct rtp_payload *payload;
        const void *p;
        void *d;
        ssize_t l;
        size_t to_write, to_decode;

        a2dp_prepare_buffer(u);

        a2dp = &u->a2dp;
        header = a2dp->buffer;
        payload = (struct rtp_payload*) ((uint8_t*) a2dp->buffer + sizeof(*header));

        l = pa_read(u->stream_fd, a2dp->buffer, a2dp->buffer_size, &u->stream_write_type);

        if (l <= 0) {

            if (l < 0 && errno == EINTR)
                /* Retry right away if we got interrupted */
                continue;

            else if (l < 0 && errno == EAGAIN)
                /* Hmm, apparently the socket was not readable, give up for now. */
                break;

            pa_log_error("Failed to read data from socket: %s", l < 0 ? pa_cstrerror(errno) : "EOF");
            ret = -1;
            break;
        }

        pa_assert((size_t) l <= a2dp->buffer_size);

        u->read_index += (uint64_t) l;

        /* TODO: get timestamp from rtp */
        if (!found_tstamp) {
            /* pa_log_warn("Couldn't find SO_TIMESTAMP data in auxiliary recvmsg() data!"); */
            tstamp = pa_rtclock_now();
        }

        pa_smoother_put(u->read_smoother, tstamp, pa_bytes_to_usec(u->read_index, &u->sample_spec));
        pa_smoother_resume(u->read_smoother, tstamp, TRUE);

        p = (uint8_t*) a2dp->buffer + sizeof(*header) + sizeof(*payload);
        to_decode = l - sizeof(*header) - sizeof(*payload);

        d = pa_memblock_acquire(memchunk.memblock);
        to_write = memchunk.length = pa_memblock_get_length(memchunk.memblock);

        while (PA_LIKELY(to_decode > 0)) {
            size_t written;
            ssize_t decoded;

            decoded = sbc_decode(&a2dp->sbc,
                                 p, to_decode,
                                 d, to_write,
                                 &written);

            if (PA_UNLIKELY(decoded <= 0)) {
                pa_log_error("SBC decoding error (%li)", (long) decoded);
                pa_memblock_release(memchunk.memblock);
                pa_memblock_unref(memchunk.memblock);
                return -1;
            }

/*             pa_log_debug("SBC: decoded: %lu; written: %lu", (unsigned long) decoded, (unsigned long) written); */
/*             pa_log_debug("SBC: frame_length: %lu; codesize: %lu", (unsigned long) a2dp->frame_length, (unsigned long) a2dp->codesize); */

            /* Reset frame length, it can be changed due to bitpool change */
            a2dp->frame_length = sbc_get_frame_length(&a2dp->sbc);

            pa_assert_fp((size_t) decoded <= to_decode);
            pa_assert_fp((size_t) decoded == a2dp->frame_length);

            pa_assert_fp((size_t) written == a2dp->codesize);

            p = (const uint8_t*) p + decoded;
            to_decode -= decoded;

            d = (uint8_t*) d + written;
            to_write -= written;
        }

        memchunk.length -= to_write;

        pa_memblock_release(memchunk.memblock);

        pa_source_post(u->source, &memchunk);

        ret = l;
        break;
    }

    pa_memblock_unref(memchunk.memblock);

    return ret;
}

static void a2dp_reduce_bitpool(struct userdata *u)
{
    struct a2dp_info *a2dp;
    uint8_t bitpool;

    pa_assert(u);

    a2dp = &u->a2dp;

    /* Check if bitpool is already at its limit */
    if (a2dp->sbc.bitpool <= BITPOOL_DEC_LIMIT)
        return;

    bitpool = a2dp->sbc.bitpool - BITPOOL_DEC_STEP;

    if (bitpool < BITPOOL_DEC_LIMIT)
        bitpool = BITPOOL_DEC_LIMIT;

    a2dp_set_bitpool(u, bitpool);
}

static void thread_func(void *userdata) {
    struct userdata *u = userdata;
    unsigned do_write = 0;
    unsigned pending_read_bytes = 0;
    pa_bool_t writable = FALSE;

    pa_assert(u);
    pa_assert(u->transport);

    pa_log_debug("IO Thread starting up");

    if (u->core->realtime_scheduling)
        pa_make_realtime(u->core->realtime_priority);

    pa_thread_mq_install(&u->thread_mq);

    if (bt_transport_acquire(u, TRUE) < 0)
        goto fail;

    for (;;) {
        struct pollfd *pollfd;
        int ret;
        pa_bool_t disable_timer = TRUE;

        pollfd = u->rtpoll_item ? pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL) : NULL;

        if (u->source && PA_SOURCE_IS_LINKED(u->source->thread_info.state)) {

            /* We should send two blocks to the device before we expect
             * a response. */

            if (u->write_index == 0 && u->read_index <= 0)
                do_write = 2;

            if (pollfd && (pollfd->revents & POLLIN)) {
                int n_read;

                if (u->profile == PROFILE_HSP || u->profile == PROFILE_HFGW)
                    n_read = hsp_process_push(u);
                else
                    n_read = a2dp_process_push(u);

                if (n_read < 0)
                    goto fail;

                /* We just read something, so we are supposed to write something, too */
                pending_read_bytes += n_read;
                do_write += pending_read_bytes / u->write_block_size;
                pending_read_bytes = pending_read_bytes % u->write_block_size;
            }
        }

        if (u->sink && PA_SINK_IS_LINKED(u->sink->thread_info.state)) {

            if (u->sink->thread_info.rewind_requested)
                pa_sink_process_rewind(u->sink, 0);

            if (pollfd) {
                if (pollfd->revents & POLLOUT)
                    writable = TRUE;

                if ((!u->source || !PA_SOURCE_IS_LINKED(u->source->thread_info.state)) && do_write <= 0 && writable) {
                    pa_usec_t time_passed;
                    pa_usec_t audio_sent;

                    /* Hmm, there is no input stream we could synchronize
                     * to. So let's do things by time */

                    time_passed = pa_rtclock_now() - u->started_at;
                    audio_sent = pa_bytes_to_usec(u->write_index, &u->sample_spec);

                    if (audio_sent <= time_passed) {
                        pa_usec_t audio_to_send = time_passed - audio_sent;

                        /* Never try to catch up for more than 100ms */
                        if (u->write_index > 0 && audio_to_send > MAX_PLAYBACK_CATCH_UP_USEC) {
                            pa_usec_t skip_usec;
                            uint64_t skip_bytes;

                            skip_usec = audio_to_send - MAX_PLAYBACK_CATCH_UP_USEC;
                            skip_bytes = pa_usec_to_bytes(skip_usec, &u->sample_spec);

                            if (skip_bytes > 0) {
                                pa_memchunk tmp;

                                pa_log_warn("Skipping %llu us (= %llu bytes) in audio stream",
                                            (unsigned long long) skip_usec,
                                            (unsigned long long) skip_bytes);

                                pa_sink_render_full(u->sink, skip_bytes, &tmp);
                                pa_memblock_unref(tmp.memblock);
                                u->write_index += skip_bytes;

                                if (u->profile == PROFILE_A2DP)
                                    a2dp_reduce_bitpool(u);
                            }
                        }

                        do_write = 1;
                        pending_read_bytes = 0;
                    }
                }

                if (writable && do_write > 0) {
                    int n_written;

                    if (u->write_index <= 0)
                        u->started_at = pa_rtclock_now();

                    if (u->profile == PROFILE_A2DP) {
                        if ((n_written = a2dp_process_render(u)) < 0)
                            goto fail;
                    } else {
                        if ((n_written = hsp_process_render(u)) < 0)
                            goto fail;
                    }

                    if (n_written == 0)
                        pa_log("Broken kernel: we got EAGAIN on write() after POLLOUT!");

                    do_write -= n_written;
                    writable = FALSE;
                }

                if ((!u->source || !PA_SOURCE_IS_LINKED(u->source->thread_info.state)) && do_write <= 0) {
                    pa_usec_t sleep_for;
                    pa_usec_t time_passed, next_write_at;

                    if (writable) {
                        /* Hmm, there is no input stream we could synchronize
                         * to. So let's estimate when we need to wake up the latest */
                        time_passed = pa_rtclock_now() - u->started_at;
                        next_write_at = pa_bytes_to_usec(u->write_index, &u->sample_spec);
                        sleep_for = time_passed < next_write_at ? next_write_at - time_passed : 0;
                        /* pa_log("Sleeping for %lu; time passed %lu, next write at %lu", (unsigned long) sleep_for, (unsigned long) time_passed, (unsigned long)next_write_at); */
                    } else
                        /* drop stream every 500 ms */
                        sleep_for = PA_USEC_PER_MSEC * 500;

                    pa_rtpoll_set_timer_relative(u->rtpoll, sleep_for);
                    disable_timer = FALSE;
                }
            }
        }

        if (disable_timer)
            pa_rtpoll_set_timer_disabled(u->rtpoll);

        /* Hmm, nothing to do. Let's sleep */
        if (pollfd)
            pollfd->events = (short) (((u->sink && PA_SINK_IS_LINKED(u->sink->thread_info.state) && !writable) ? POLLOUT : 0) |
                                      (u->source && PA_SOURCE_IS_LINKED(u->source->thread_info.state) ? POLLIN : 0));

        if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0) {
            pa_log_debug("pa_rtpoll_run failed with: %d", ret);
            goto fail;
        }
        if (ret == 0) {
            pa_log_debug("IO thread shutdown requested, stopping cleanly");
            bt_transport_release(u);
            goto finish;
        }

        pollfd = u->rtpoll_item ? pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL) : NULL;

        if (pollfd && (pollfd->revents & ~(POLLOUT|POLLIN))) {
            pa_log_info("FD error: %s%s%s%s",
                        pollfd->revents & POLLERR ? "POLLERR " :"",
                        pollfd->revents & POLLHUP ? "POLLHUP " :"",
                        pollfd->revents & POLLPRI ? "POLLPRI " :"",
                        pollfd->revents & POLLNVAL ? "POLLNVAL " :"");
            goto fail;
        }
    }

fail:
    /* If this was no regular exit from the loop we have to continue processing messages until we receive PA_MESSAGE_SHUTDOWN */
    pa_log_debug("IO thread failed");
    pa_asyncmsgq_post(pa_thread_mq_get()->outq, PA_MSGOBJECT(u->msg), BLUETOOTH_MESSAGE_IO_THREAD_FAILED, NULL, 0, NULL, NULL);
    pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);

finish:
    pa_log_debug("IO thread shutting down");
}

static pa_bt_audio_state_t parse_state_property_change(DBusMessage *m) {
    DBusMessageIter iter;
    DBusMessageIter variant;
    const char *key;
    const char *value;
    pa_bt_audio_state_t state;

    if (!dbus_message_iter_init(m, &iter)) {
        pa_log("Failed to parse PropertyChanged");
        return PA_BT_AUDIO_STATE_INVALID;
    }

    if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING) {
        pa_log("Property name not a string");
        return PA_BT_AUDIO_STATE_INVALID;
    }

    dbus_message_iter_get_basic(&iter, &key);

    if (!pa_streq(key, "State"))
        return PA_BT_AUDIO_STATE_INVALID;

    if (!dbus_message_iter_next(&iter)) {
        pa_log("Property value missing");
        return PA_BT_AUDIO_STATE_INVALID;
    }

    dbus_message_iter_recurse(&iter, &variant);

    if (dbus_message_iter_get_arg_type(&variant) != DBUS_TYPE_STRING) {
        pa_log("Property value not a string");
        return PA_BT_AUDIO_STATE_INVALID;
    }

    dbus_message_iter_get_basic(&variant, &value);

    pa_log_debug("dbus: %s property 'State' changed to value '%s'", dbus_message_get_interface(m), value);

    state = pa_bt_audio_state_from_string(value);

    if (state == PA_BT_AUDIO_STATE_INVALID)
        pa_log("Unexpected value for property 'State': '%s'", value);

    return state;
}

/* Run from main thread */
static DBusHandlerResult filter_cb(DBusConnection *bus, DBusMessage *m, void *userdata) {
    DBusError err;
    struct userdata *u;

    pa_assert(bus);
    pa_assert(m);
    pa_assert_se(u = userdata);

    dbus_error_init(&err);

    pa_log_debug("dbus: interface=%s, path=%s, member=%s\n",
                 dbus_message_get_interface(m),
                 dbus_message_get_path(m),
                 dbus_message_get_member(m));

    if (!dbus_message_has_path(m, u->path) && !dbus_message_has_path(m, u->transport))
        goto fail;

    if (dbus_message_is_signal(m, "org.bluez.Headset", "SpeakerGainChanged") ||
        dbus_message_is_signal(m, "org.bluez.Headset", "MicrophoneGainChanged")) {

        dbus_uint16_t gain;
        pa_cvolume v;

        if (!dbus_message_get_args(m, &err, DBUS_TYPE_UINT16, &gain, DBUS_TYPE_INVALID) || gain > HSP_MAX_GAIN) {
            pa_log("Failed to parse org.bluez.Headset.{Speaker|Microphone}GainChanged: %s", err.message);
            goto fail;
        }

        if (u->profile == PROFILE_HSP) {
            if (u->sink && dbus_message_is_signal(m, "org.bluez.Headset", "SpeakerGainChanged")) {
                pa_volume_t volume = (pa_volume_t) (gain * PA_VOLUME_NORM / HSP_MAX_GAIN);

                /* increment volume by one to correct rounding errors */
                if (volume < PA_VOLUME_NORM)
                    volume++;

                pa_cvolume_set(&v, u->sample_spec.channels, volume);
                pa_sink_volume_changed(u->sink, &v);

            } else if (u->source && dbus_message_is_signal(m, "org.bluez.Headset", "MicrophoneGainChanged")) {
                pa_volume_t volume = (pa_volume_t) (gain * PA_VOLUME_NORM / HSP_MAX_GAIN);

                /* increment volume by one to correct rounding errors */
                if (volume < PA_VOLUME_NORM)
                    volume++;

                pa_cvolume_set(&v, u->sample_spec.channels, volume);
                pa_source_volume_changed(u->source, &v);
            }
        }
    } else if (dbus_message_is_signal(m, "org.bluez.HandsfreeGateway", "PropertyChanged")) {
        pa_bt_audio_state_t state = parse_state_property_change(m);

        switch(state) {
            case PA_BT_AUDIO_STATE_INVALID:
            case PA_BT_AUDIO_STATE_DISCONNECTED:
            case PA_BT_AUDIO_STATE_CONNECTED:
            case PA_BT_AUDIO_STATE_CONNECTING:
                goto fail;

            case PA_BT_AUDIO_STATE_PLAYING:
                if (u->card) {
                    pa_log_debug("Changing profile to hfgw");
                    if (pa_card_set_profile(u->card, "hfgw", FALSE) < 0)
                        pa_log("Failed to change profile to hfgw");
                }
                break;
        }
    }

fail:
    dbus_error_free(&err);

    return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}

/* Run from main thread */
static void sink_set_volume_cb(pa_sink *s) {
    DBusMessage *m;
    dbus_uint16_t gain;
    pa_volume_t volume;
    struct userdata *u;
    char *k;

    pa_assert(s);
    pa_assert(s->core);

    k = pa_sprintf_malloc("bluetooth-device@%p", (void*) s);
    u = pa_shared_get(s->core, k);
    pa_xfree(k);

    pa_assert(u);
    pa_assert(u->sink == s);
    pa_assert(u->profile == PROFILE_HSP);

    gain = (pa_cvolume_max(&s->real_volume) * HSP_MAX_GAIN) / PA_VOLUME_NORM;

    if (gain > HSP_MAX_GAIN)
        gain = HSP_MAX_GAIN;

    volume = (pa_volume_t) (gain * PA_VOLUME_NORM / HSP_MAX_GAIN);

    /* increment volume by one to correct rounding errors */
    if (volume < PA_VOLUME_NORM)
        volume++;

    pa_cvolume_set(&s->real_volume, u->sample_spec.channels, volume);

    pa_assert_se(m = dbus_message_new_method_call("org.bluez", u->path, "org.bluez.Headset", "SetSpeakerGain"));
    pa_assert_se(dbus_message_append_args(m, DBUS_TYPE_UINT16, &gain, DBUS_TYPE_INVALID));
    pa_assert_se(dbus_connection_send(pa_dbus_connection_get(u->connection), m, NULL));
    dbus_message_unref(m);
}

/* Run from main thread */
static void source_set_volume_cb(pa_source *s) {
    DBusMessage *m;
    dbus_uint16_t gain;
    pa_volume_t volume;
    struct userdata *u;
    char *k;

    pa_assert(s);
    pa_assert(s->core);

    k = pa_sprintf_malloc("bluetooth-device@%p", (void*) s);
    u = pa_shared_get(s->core, k);
    pa_xfree(k);

    pa_assert(u);
    pa_assert(u->source == s);
    pa_assert(u->profile == PROFILE_HSP);

    gain = (pa_cvolume_max(&s->real_volume) * HSP_MAX_GAIN) / PA_VOLUME_NORM;

    if (gain > HSP_MAX_GAIN)
        gain = HSP_MAX_GAIN;

    volume = (pa_volume_t) (gain * PA_VOLUME_NORM / HSP_MAX_GAIN);

    /* increment volume by one to correct rounding errors */
    if (volume < PA_VOLUME_NORM)
        volume++;

    pa_cvolume_set(&s->real_volume, u->sample_spec.channels, volume);

    pa_assert_se(m = dbus_message_new_method_call("org.bluez", u->path, "org.bluez.Headset", "SetMicrophoneGain"));
    pa_assert_se(dbus_message_append_args(m, DBUS_TYPE_UINT16, &gain, DBUS_TYPE_INVALID));
    pa_assert_se(dbus_connection_send(pa_dbus_connection_get(u->connection), m, NULL));
    dbus_message_unref(m);
}

/* Run from main thread */
static char *get_name(const char *type, pa_modargs *ma, const char *device_id, pa_bool_t *namereg_fail) {
    char *t;
    const char *n;

    pa_assert(type);
    pa_assert(ma);
    pa_assert(device_id);
    pa_assert(namereg_fail);

    t = pa_sprintf_malloc("%s_name", type);
    n = pa_modargs_get_value(ma, t, NULL);
    pa_xfree(t);

    if (n) {
        *namereg_fail = TRUE;
        return pa_xstrdup(n);
    }

    if ((n = pa_modargs_get_value(ma, "name", NULL)))
        *namereg_fail = TRUE;
    else {
        n = device_id;
        *namereg_fail = FALSE;
    }

    return pa_sprintf_malloc("bluez_%s.%s", type, n);
}

static int sco_over_pcm_state_update(struct userdata *u, pa_bool_t changed) {
    pa_assert(u);
    pa_assert(USE_SCO_OVER_PCM(u));

    if (PA_SINK_IS_OPENED(pa_sink_get_state(u->hsp.sco_sink)) ||
        PA_SOURCE_IS_OPENED(pa_source_get_state(u->hsp.sco_source))) {

        if (u->stream_fd >= 0)
            return 0;

        pa_log_debug("Resuming SCO over PCM");
        if (init_profile(u) < 0) {
            pa_log("Can't resume SCO over PCM");
            return -1;
        }

        return bt_transport_acquire(u, TRUE);
    }

    if (changed) {
        if (u->stream_fd < 0)
            return 0;

        pa_log_debug("Closing SCO over PCM");

        bt_transport_release(u);
    }

    return 0;
}

static pa_hook_result_t sink_state_changed_cb(pa_core *c, pa_sink *s, struct userdata *u) {
    pa_assert(c);
    pa_sink_assert_ref(s);
    pa_assert(u);

    if (s != u->hsp.sco_sink)
        return PA_HOOK_OK;

    sco_over_pcm_state_update(u, TRUE);

    return PA_HOOK_OK;
}

static pa_hook_result_t source_state_changed_cb(pa_core *c, pa_source *s, struct userdata *u) {
    pa_assert(c);
    pa_source_assert_ref(s);
    pa_assert(u);

    if (s != u->hsp.sco_source)
        return PA_HOOK_OK;

    sco_over_pcm_state_update(u, TRUE);

    return PA_HOOK_OK;
}

static pa_hook_result_t nrec_changed_cb(pa_bluetooth_transport *t, void *call_data, struct userdata *u) {
    pa_proplist *p;

    pa_assert(t);
    pa_assert(u);

    p = pa_proplist_new();
    pa_proplist_sets(p, "bluetooth.nrec", t->nrec ? "1" : "0");
    pa_source_update_proplist(u->source, PA_UPDATE_REPLACE, p);
    pa_proplist_free(p);

    return PA_HOOK_OK;
}

static void connect_ports(struct userdata *u, void *sink_or_source_new_data, pa_direction_t direction) {
    union {
        pa_sink_new_data *sink_new_data;
        pa_source_new_data *source_new_data;
    } data;
    pa_device_port *port;

    if (direction == PA_DIRECTION_OUTPUT)
        data.sink_new_data = sink_or_source_new_data;
    else
        data.source_new_data = sink_or_source_new_data;

    switch (u->profile) {
        case PROFILE_A2DP:
            pa_assert_se(port = pa_hashmap_get(u->card->ports, "a2dp-output"));
            pa_assert_se(pa_hashmap_put(data.sink_new_data->ports, port->name, port) >= 0);
            pa_device_port_ref(port);
            break;

        case PROFILE_A2DP_SOURCE:
            pa_assert_se(port = pa_hashmap_get(u->card->ports, "a2dp-input"));
            pa_assert_se(pa_hashmap_put(data.source_new_data->ports, port->name, port) >= 0);
            pa_device_port_ref(port);
            break;

        case PROFILE_HSP:
            if (direction == PA_DIRECTION_OUTPUT) {
                pa_assert_se(port = pa_hashmap_get(u->card->ports, "hsp-output"));
                pa_assert_se(pa_hashmap_put(data.sink_new_data->ports, port->name, port) >= 0);
            } else {
                pa_assert_se(port = pa_hashmap_get(u->card->ports, "hsp-input"));
                pa_assert_se(pa_hashmap_put(data.source_new_data->ports, port->name, port) >= 0);
            }
            pa_device_port_ref(port);
            break;

        case PROFILE_HFGW:
            if (direction == PA_DIRECTION_OUTPUT) {
                pa_assert_se(port = pa_hashmap_get(u->card->ports, "hfgw-output"));
                pa_assert_se(pa_hashmap_put(data.sink_new_data->ports, port->name, port) >= 0);
            } else {
                pa_assert_se(port = pa_hashmap_get(u->card->ports, "hfgw-input"));
                pa_assert_se(pa_hashmap_put(data.source_new_data->ports, port->name, port) >= 0);
            }
            pa_device_port_ref(port);
            break;

        default:
            pa_assert_not_reached();
    }
}

static const char *profile_to_string(enum profile profile) {
    switch(profile) {
        case PROFILE_A2DP:
            return "a2dp";
        case PROFILE_A2DP_SOURCE:
            return "a2dp_source";
        case PROFILE_HSP:
            return "hsp";
        case PROFILE_HFGW:
            return "hfgw";
        default:
            pa_assert_not_reached();
    }
}

/* Run from main thread */
static int add_sink(struct userdata *u) {
    char *k;

    if (USE_SCO_OVER_PCM(u)) {
        pa_proplist *p;

        u->sink = u->hsp.sco_sink;
        p = pa_proplist_new();
        pa_proplist_sets(p, "bluetooth.protocol", profile_to_string(u->profile));
        pa_proplist_update(u->sink->proplist, PA_UPDATE_MERGE, p);
        pa_proplist_free(p);

        if (!u->hsp.sink_state_changed_slot)
            u->hsp.sink_state_changed_slot = pa_hook_connect(&u->core->hooks[PA_CORE_HOOK_SINK_STATE_CHANGED], PA_HOOK_NORMAL, (pa_hook_cb_t) sink_state_changed_cb, u);

    } else {
        pa_sink_new_data data;
        pa_bool_t b;

        pa_sink_new_data_init(&data);
        data.driver = __FILE__;
        data.module = u->module;
        pa_sink_new_data_set_sample_spec(&data, &u->sample_spec);
        pa_proplist_sets(data.proplist, "bluetooth.protocol", profile_to_string(u->profile));
        if (u->profile == PROFILE_HSP)
            pa_proplist_sets(data.proplist, PA_PROP_DEVICE_INTENDED_ROLES, "phone");
        data.card = u->card;
        data.name = get_name("sink", u->modargs, u->address, &b);
        data.namereg_fail = b;

        if (pa_modargs_get_proplist(u->modargs, "sink_properties", data.proplist, PA_UPDATE_REPLACE) < 0) {
            pa_log("Invalid properties");
            pa_sink_new_data_done(&data);
            return -1;
        }
        connect_ports(u, &data, PA_DIRECTION_OUTPUT);

        u->sink = pa_sink_new(u->core, &data, PA_SINK_HARDWARE|PA_SINK_LATENCY);
        pa_sink_new_data_done(&data);

        if (!u->sink) {
            pa_log_error("Failed to create sink");
            return -1;
        }

        u->sink->userdata = u;
        u->sink->parent.process_msg = sink_process_msg;

        pa_sink_set_max_request(u->sink, u->write_block_size);
        pa_sink_set_fixed_latency(u->sink,
                                  (u->profile == PROFILE_A2DP ? FIXED_LATENCY_PLAYBACK_A2DP : FIXED_LATENCY_PLAYBACK_HSP) +
                                  pa_bytes_to_usec(u->write_block_size, &u->sample_spec));
    }

    if (u->profile == PROFILE_HSP) {
        pa_sink_set_set_volume_callback(u->sink, sink_set_volume_cb);
        u->sink->n_volume_steps = 16;

        k = pa_sprintf_malloc("bluetooth-device@%p", (void*) u->sink);
        pa_shared_set(u->core, k, u);
        pa_xfree(k);
    }

    return 0;
}

/* Run from main thread */
static int add_source(struct userdata *u) {
    char *k;

    if (USE_SCO_OVER_PCM(u)) {
        u->source = u->hsp.sco_source;
        pa_proplist_sets(u->source->proplist, "bluetooth.protocol", profile_to_string(u->profile));

        if (!u->hsp.source_state_changed_slot)
            u->hsp.source_state_changed_slot = pa_hook_connect(&u->core->hooks[PA_CORE_HOOK_SOURCE_STATE_CHANGED], PA_HOOK_NORMAL, (pa_hook_cb_t) source_state_changed_cb, u);

    } else {
        pa_source_new_data data;
        pa_bool_t b;

        pa_source_new_data_init(&data);
        data.driver = __FILE__;
        data.module = u->module;
        pa_source_new_data_set_sample_spec(&data, &u->sample_spec);
        pa_proplist_sets(data.proplist, "bluetooth.protocol", profile_to_string(u->profile));
        if (u->profile == PROFILE_HSP)
            pa_proplist_sets(data.proplist, PA_PROP_DEVICE_INTENDED_ROLES, "phone");

        data.card = u->card;
        data.name = get_name("source", u->modargs, u->address, &b);
        data.namereg_fail = b;

        if (pa_modargs_get_proplist(u->modargs, "source_properties", data.proplist, PA_UPDATE_REPLACE) < 0) {
            pa_log("Invalid properties");
            pa_source_new_data_done(&data);
            return -1;
        }

        connect_ports(u, &data, PA_DIRECTION_INPUT);
        u->source = pa_source_new(u->core, &data, PA_SOURCE_HARDWARE|PA_SOURCE_LATENCY);
        pa_source_new_data_done(&data);

        if (!u->source) {
            pa_log_error("Failed to create source");
            return -1;
        }

        u->source->userdata = u;
        u->source->parent.process_msg = source_process_msg;

        pa_source_set_fixed_latency(u->source,
                                    (u->profile == PROFILE_A2DP_SOURCE ? FIXED_LATENCY_RECORD_A2DP : FIXED_LATENCY_RECORD_HSP) +
                                    pa_bytes_to_usec(u->read_block_size, &u->sample_spec));
    }

    if ((u->profile == PROFILE_HSP) || (u->profile == PROFILE_HFGW)) {
        pa_bluetooth_transport *t;
        t = pa_bluetooth_discovery_get_transport(u->discovery, u->transport);
        pa_assert(t);
        pa_proplist_sets(u->source->proplist, "bluetooth.nrec", t->nrec ? "1" : "0");

        if (!u->hsp.nrec_changed_slot)
            u->hsp.nrec_changed_slot = pa_hook_connect(&t->hooks[PA_BLUETOOTH_TRANSPORT_HOOK_NREC_CHANGED], PA_HOOK_NORMAL, (pa_hook_cb_t) nrec_changed_cb, u);
    }

    if (u->profile == PROFILE_HSP) {
        pa_source_set_set_volume_callback(u->source, source_set_volume_cb);
        u->source->n_volume_steps = 16;

        k = pa_sprintf_malloc("bluetooth-device@%p", (void*) u->source);
        pa_shared_set(u->core, k, u);
        pa_xfree(k);
    }

    return 0;
}

static void bt_transport_config_a2dp(struct userdata *u) {
    const pa_bluetooth_transport *t;
    struct a2dp_info *a2dp = &u->a2dp;
    a2dp_sbc_t *config;

    t = pa_bluetooth_discovery_get_transport(u->discovery, u->transport);
    pa_assert(t);

    config = (a2dp_sbc_t *) t->config;

    u->sample_spec.format = PA_SAMPLE_S16LE;

    if (a2dp->sbc_initialized)
        sbc_reinit(&a2dp->sbc, 0);
    else
        sbc_init(&a2dp->sbc, 0);
    a2dp->sbc_initialized = TRUE;

    switch (config->frequency) {
        case BT_SBC_SAMPLING_FREQ_16000:
            a2dp->sbc.frequency = SBC_FREQ_16000;
            u->sample_spec.rate = 16000U;
            break;
        case BT_SBC_SAMPLING_FREQ_32000:
            a2dp->sbc.frequency = SBC_FREQ_32000;
            u->sample_spec.rate = 32000U;
            break;
        case BT_SBC_SAMPLING_FREQ_44100:
            a2dp->sbc.frequency = SBC_FREQ_44100;
            u->sample_spec.rate = 44100U;
            break;
        case BT_SBC_SAMPLING_FREQ_48000:
            a2dp->sbc.frequency = SBC_FREQ_48000;
            u->sample_spec.rate = 48000U;
            break;
        default:
            pa_assert_not_reached();
    }

    switch (config->channel_mode) {
        case BT_A2DP_CHANNEL_MODE_MONO:
            a2dp->sbc.mode = SBC_MODE_MONO;
            u->sample_spec.channels = 1;
            break;
        case BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL:
            a2dp->sbc.mode = SBC_MODE_DUAL_CHANNEL;
            u->sample_spec.channels = 2;
            break;
        case BT_A2DP_CHANNEL_MODE_STEREO:
            a2dp->sbc.mode = SBC_MODE_STEREO;
            u->sample_spec.channels = 2;
            break;
        case BT_A2DP_CHANNEL_MODE_JOINT_STEREO:
            a2dp->sbc.mode = SBC_MODE_JOINT_STEREO;
            u->sample_spec.channels = 2;
            break;
        default:
            pa_assert_not_reached();
    }

    switch (config->allocation_method) {
        case BT_A2DP_ALLOCATION_SNR:
            a2dp->sbc.allocation = SBC_AM_SNR;
            break;
        case BT_A2DP_ALLOCATION_LOUDNESS:
            a2dp->sbc.allocation = SBC_AM_LOUDNESS;
            break;
        default:
            pa_assert_not_reached();
    }

    switch (config->subbands) {
        case BT_A2DP_SUBBANDS_4:
            a2dp->sbc.subbands = SBC_SB_4;
            break;
        case BT_A2DP_SUBBANDS_8:
            a2dp->sbc.subbands = SBC_SB_8;
            break;
        default:
            pa_assert_not_reached();
    }

    switch (config->block_length) {
        case BT_A2DP_BLOCK_LENGTH_4:
            a2dp->sbc.blocks = SBC_BLK_4;
            break;
        case BT_A2DP_BLOCK_LENGTH_8:
            a2dp->sbc.blocks = SBC_BLK_8;
            break;
        case BT_A2DP_BLOCK_LENGTH_12:
            a2dp->sbc.blocks = SBC_BLK_12;
            break;
        case BT_A2DP_BLOCK_LENGTH_16:
            a2dp->sbc.blocks = SBC_BLK_16;
            break;
        default:
            pa_assert_not_reached();
    }

    a2dp->min_bitpool = config->min_bitpool;
    a2dp->max_bitpool = config->max_bitpool;

    /* Set minimum bitpool for source to get the maximum possible block_size */
    a2dp->sbc.bitpool = u->profile == PROFILE_A2DP ? a2dp->max_bitpool : a2dp->min_bitpool;
    a2dp->codesize = sbc_get_codesize(&a2dp->sbc);
    a2dp->frame_length = sbc_get_frame_length(&a2dp->sbc);

    u->read_block_size =
        (u->read_link_mtu - sizeof(struct rtp_header) - sizeof(struct rtp_payload))
        / a2dp->frame_length * a2dp->codesize;

    u->write_block_size =
        (u->write_link_mtu - sizeof(struct rtp_header) - sizeof(struct rtp_payload))
        / a2dp->frame_length * a2dp->codesize;

    pa_log_info("SBC parameters:\n\tallocation=%u\n\tsubbands=%u\n\tblocks=%u\n\tbitpool=%u\n",
                a2dp->sbc.allocation, a2dp->sbc.subbands, a2dp->sbc.blocks, a2dp->sbc.bitpool);
}

static void bt_transport_config(struct userdata *u) {
    if (u->profile == PROFILE_HSP || u->profile == PROFILE_HFGW) {
        u->read_block_size = u->read_link_mtu;
        u->write_block_size = u->write_link_mtu;
        u->sample_spec.format = PA_SAMPLE_S16LE;
        u->sample_spec.channels = 1;
        u->sample_spec.rate = 8000;
    } else
        bt_transport_config_a2dp(u);
}

/* Run from main thread */
static int setup_bt(struct userdata *u) {
    const pa_bluetooth_device *d;
    const pa_bluetooth_transport *t;

    pa_assert(u);

    if (!(d = pa_bluetooth_discovery_get_by_path(u->discovery, u->path))) {
        pa_log_error("Failed to get device object.");
        return -1;
    }

    /* release transport if exist */
    if (u->transport) {
        bt_transport_release(u);
        pa_xfree(u->transport);
        u->transport = NULL;
    }

    /* check if profile has a transport */
    t = pa_bluetooth_device_get_transport(d, u->profile);
    if (t == NULL) {
        pa_log_warn("Profile has no transport");
        return -1;
    }

    u->transport = pa_xstrdup(t->path);

    if (bt_transport_acquire(u, FALSE) < 0)
        return -1;

    bt_transport_config(u);

    return 0;
}

/* Run from main thread */
static int init_profile(struct userdata *u) {
    int r = 0;
    pa_assert(u);
    pa_assert(u->profile != PROFILE_OFF);

    if (setup_bt(u) < 0)
        return -1;

    if (u->profile == PROFILE_A2DP ||
        u->profile == PROFILE_HSP ||
        u->profile == PROFILE_HFGW)
        if (add_sink(u) < 0)
            r = -1;

    if (u->profile == PROFILE_HSP ||
        u->profile == PROFILE_A2DP_SOURCE ||
        u->profile == PROFILE_HFGW)
        if (add_source(u) < 0)
            r = -1;

    return r;
}

/* Run from main thread */
static void stop_thread(struct userdata *u) {
    char *k;

    pa_assert(u);

    if (u->thread) {
        pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
        pa_thread_free(u->thread);
        u->thread = NULL;
    }

    if (u->rtpoll_item) {
        pa_rtpoll_item_free(u->rtpoll_item);
        u->rtpoll_item = NULL;
    }

    if (u->hsp.sink_state_changed_slot) {
        pa_hook_slot_free(u->hsp.sink_state_changed_slot);
        u->hsp.sink_state_changed_slot = NULL;
    }

    if (u->hsp.source_state_changed_slot) {
        pa_hook_slot_free(u->hsp.source_state_changed_slot);
        u->hsp.source_state_changed_slot = NULL;
    }

    if (u->hsp.nrec_changed_slot) {
        pa_hook_slot_free(u->hsp.nrec_changed_slot);
        u->hsp.nrec_changed_slot = NULL;
    }

    if (u->sink) {
        if (u->profile == PROFILE_HSP) {
            k = pa_sprintf_malloc("bluetooth-device@%p", (void*) u->sink);
            pa_shared_remove(u->core, k);
            pa_xfree(k);
        }

        pa_sink_unref(u->sink);
        u->sink = NULL;
    }

    if (u->source) {
        if (u->profile == PROFILE_HSP) {
            k = pa_sprintf_malloc("bluetooth-device@%p", (void*) u->source);
            pa_shared_remove(u->core, k);
            pa_xfree(k);
        }

        pa_source_unref(u->source);
        u->source = NULL;
    }

    if (u->rtpoll) {
        pa_thread_mq_done(&u->thread_mq);

        pa_rtpoll_free(u->rtpoll);
        u->rtpoll = NULL;
    }

    if (u->read_smoother) {
        pa_smoother_free(u->read_smoother);
        u->read_smoother = NULL;
    }
}

/* Run from main thread */
static int start_thread(struct userdata *u) {
    pa_assert(u);
    pa_assert(!u->thread);
    pa_assert(!u->rtpoll);
    pa_assert(!u->rtpoll_item);

    u->rtpoll = pa_rtpoll_new();
    pa_thread_mq_init(&u->thread_mq, u->core->mainloop, u->rtpoll);

    if (USE_SCO_OVER_PCM(u)) {
        if (sco_over_pcm_state_update(u, FALSE) < 0) {
            char *k;

            if (u->sink) {
                k = pa_sprintf_malloc("bluetooth-device@%p", (void*) u->sink);
                pa_shared_remove(u->core, k);
                pa_xfree(k);
                u->sink = NULL;
            }
            if (u->source) {
                k = pa_sprintf_malloc("bluetooth-device@%p", (void*) u->source);
                pa_shared_remove(u->core, k);
                pa_xfree(k);
                u->source = NULL;
            }
            return -1;
        }

        pa_sink_ref(u->sink);
        pa_source_ref(u->source);
        /* FIXME: monitor stream_fd error */
        return 0;
    }

    if (!(u->thread = pa_thread_new("bluetooth", thread_func, u))) {
        pa_log_error("Failed to create IO thread");
        stop_thread(u);
        return -1;
    }

    if (u->sink) {
        pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
        pa_sink_set_rtpoll(u->sink, u->rtpoll);
        pa_sink_put(u->sink);

        if (u->sink->set_volume)
            u->sink->set_volume(u->sink);
    }

    if (u->source) {
        pa_source_set_asyncmsgq(u->source, u->thread_mq.inq);
        pa_source_set_rtpoll(u->source, u->rtpoll);
        pa_source_put(u->source);

        if (u->source->set_volume)
            u->source->set_volume(u->source);
    }

    return 0;
}

static void save_sco_volume_callbacks(struct userdata *u) {
    pa_assert(u);
    pa_assert(USE_SCO_OVER_PCM(u));

    u->hsp.sco_sink_set_volume = u->hsp.sco_sink->set_volume;
    u->hsp.sco_source_set_volume = u->hsp.sco_source->set_volume;
}

static void restore_sco_volume_callbacks(struct userdata *u) {
    pa_assert(u);
    pa_assert(USE_SCO_OVER_PCM(u));

    pa_sink_set_set_volume_callback(u->hsp.sco_sink, u->hsp.sco_sink_set_volume);
    pa_source_set_set_volume_callback(u->hsp.sco_source, u->hsp.sco_source_set_volume);
}

/* Run from main thread */
static int card_set_profile(pa_card *c, pa_card_profile *new_profile) {
    struct userdata *u;
    enum profile *d;
    pa_queue *inputs = NULL, *outputs = NULL;
    const pa_bluetooth_device *device;

    pa_assert(c);
    pa_assert(new_profile);
    pa_assert_se(u = c->userdata);

    d = PA_CARD_PROFILE_DATA(new_profile);

    if (!(device = pa_bluetooth_discovery_get_by_path(u->discovery, u->path))) {
        pa_log_error("Failed to get device object.");
        return -PA_ERR_IO;
    }

    /* The state signal is sent by bluez, so it is racy to check
       strictly for CONNECTED, we should also accept STREAMING state
       as being good enough. However, if the profile is used
       concurrently (which is unlikely), ipc will fail later on, and
       module will be unloaded. */
    if (device->headset_state < PA_BT_AUDIO_STATE_CONNECTED && *d == PROFILE_HSP) {
        pa_log_warn("HSP is not connected, refused to switch profile");
        return -PA_ERR_IO;
    } else if (device->audio_sink_state < PA_BT_AUDIO_STATE_CONNECTED && *d == PROFILE_A2DP) {
        pa_log_warn("A2DP Sink is not connected, refused to switch profile");
        return -PA_ERR_IO;
    } else if (device->audio_source_state < PA_BT_AUDIO_STATE_CONNECTED && *d == PROFILE_A2DP_SOURCE) {
        pa_log_warn("A2DP Source is not connected, refused to switch profile");
        return -PA_ERR_IO;
    } else if (device->hfgw_state < PA_BT_AUDIO_STATE_CONNECTED && *d == PROFILE_HFGW) {
        pa_log_warn("HandsfreeGateway is not connected, refused to switch profile");
        return -PA_ERR_IO;
    }

    if (u->sink) {
        inputs = pa_sink_move_all_start(u->sink, NULL);

        if (!USE_SCO_OVER_PCM(u))
            pa_sink_unlink(u->sink);
    }

    if (u->source) {
        outputs = pa_source_move_all_start(u->source, NULL);

        if (!USE_SCO_OVER_PCM(u))
            pa_source_unlink(u->source);
    }

    stop_thread(u);

    if (u->profile != PROFILE_OFF && u->transport) {
        bt_transport_release(u);
        pa_xfree(u->transport);
        u->transport = NULL;
    }

    if (USE_SCO_OVER_PCM(u))
        restore_sco_volume_callbacks(u);

    u->profile = *d;
    u->sample_spec = u->requested_sample_spec;

    if (USE_SCO_OVER_PCM(u))
        save_sco_volume_callbacks(u);

    if (u->profile != PROFILE_OFF)
        init_profile(u);

    if (u->sink || u->source)
        start_thread(u);

    if (inputs) {
        if (u->sink)
            pa_sink_move_all_finish(u->sink, inputs, FALSE);
        else
            pa_sink_move_all_fail(inputs);
    }

    if (outputs) {
        if (u->source)
            pa_source_move_all_finish(u->source, outputs, FALSE);
        else
            pa_source_move_all_fail(outputs);
    }

    return 0;
}

static void create_ports_for_profile(struct userdata *u, pa_card_new_data *card_new_data, pa_card_profile *profile) {
    pa_device_port *port;
    enum profile *d;

    d = PA_CARD_PROFILE_DATA(profile);

    switch (*d) {
        case PROFILE_A2DP:
            pa_assert_se(port = pa_device_port_new(u->core, "a2dp-output", _("Bluetooth High Quality (A2DP)"), 0));
            pa_assert_se(pa_hashmap_put(card_new_data->ports, port->name, port) >= 0);
            port->is_output = 1;
            port->is_input = 0;
            port->priority = profile->priority * 100;
            pa_hashmap_put(port->profiles, profile->name, profile);
            break;

        case PROFILE_A2DP_SOURCE:
            pa_assert_se(port = pa_device_port_new(u->core, "a2dp-input", _("Bluetooth High Quality (A2DP)"), 0));
            pa_assert_se(pa_hashmap_put(card_new_data->ports, port->name, port) >= 0);
            port->is_output = 0;
            port->is_input = 1;
            port->priority = profile->priority * 100;
            pa_hashmap_put(port->profiles, profile->name, profile);
            break;

        case PROFILE_HSP:
            pa_assert_se(port = pa_device_port_new(u->core, "hsp-output", _("Bluetooth Telephony (HSP/HFP)"), 0));
            pa_assert_se(pa_hashmap_put(card_new_data->ports, port->name, port) >= 0);
            port->is_output = 1;
            port->is_input = 0;
            port->priority = profile->priority * 100;
            pa_hashmap_put(port->profiles, profile->name, profile);

            pa_assert_se(port = pa_device_port_new(u->core, "hsp-input", _("Bluetooth Telephony (HSP/HFP)"), 0));
            pa_assert_se(pa_hashmap_put(card_new_data->ports, port->name, port) >= 0);
            port->is_output = 0;
            port->is_input = 1;
            port->priority = profile->priority * 100;
            pa_hashmap_put(port->profiles, profile->name, profile);
            break;

        case PROFILE_HFGW:
            pa_assert_se(port = pa_device_port_new(u->core, "hfgw-output", _("Bluetooth Handsfree Gateway"), 0));
            pa_assert_se(pa_hashmap_put(card_new_data->ports, port->name, port) >= 0);
            port->is_output = 1;
            port->is_input = 0;
            port->priority = profile->priority * 100;
            pa_hashmap_put(port->profiles, profile->name, profile);

            pa_assert_se(port = pa_device_port_new(u->core, "hfgw-input", _("Bluetooth Handsfree Gateway"), 0));
            pa_assert_se(pa_hashmap_put(card_new_data->ports, port->name, port) >= 0);
            port->is_output = 0;
            port->is_input = 1;
            port->priority = profile->priority * 100;
            pa_hashmap_put(port->profiles, profile->name, profile);
            break;

        default:
            pa_assert_not_reached();
    }

}

/* Run from main thread */
static int add_card(struct userdata *u, const pa_bluetooth_device *device) {
    pa_card_new_data data;
    pa_bool_t b;
    pa_card_profile *p;
    enum profile *d;
    const char *ff;
    char *n;
    const char *default_profile;

    pa_assert(u);
    pa_assert(device);

    pa_card_new_data_init(&data);
    data.driver = __FILE__;
    data.module = u->module;

    n = pa_bluetooth_cleanup_name(device->name);
    pa_proplist_sets(data.proplist, PA_PROP_DEVICE_DESCRIPTION, n);
    pa_xfree(n);
    pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, device->address);
    pa_proplist_sets(data.proplist, PA_PROP_DEVICE_API, "bluez");
    pa_proplist_sets(data.proplist, PA_PROP_DEVICE_CLASS, "sound");
    pa_proplist_sets(data.proplist, PA_PROP_DEVICE_BUS, "bluetooth");
    if ((ff = pa_bluetooth_get_form_factor(device->class)))
        pa_proplist_sets(data.proplist, PA_PROP_DEVICE_FORM_FACTOR, ff);
    pa_proplist_sets(data.proplist, "bluez.path", device->path);
    pa_proplist_setf(data.proplist, "bluez.class", "0x%06x", (unsigned) device->class);
    pa_proplist_sets(data.proplist, "bluez.name", device->name);
    data.name = get_name("card", u->modargs, device->address, &b);
    data.namereg_fail = b;

    if (pa_modargs_get_proplist(u->modargs, "card_properties", data.proplist, PA_UPDATE_REPLACE) < 0) {
        pa_log("Invalid properties");
        pa_card_new_data_done(&data);
        return -1;
    }

    /* we base hsp/a2dp availability on UUIDs.
       Ideally, it would be based on "Connected" state, but
       we can't afford to wait for this information when
       we are loaded with profile="hsp", for instance */
    if (pa_bluetooth_uuid_has(device->uuids, A2DP_SINK_UUID)) {
        p = pa_card_profile_new("a2dp", _("High Fidelity Playback (A2DP)"), sizeof(enum profile));
        p->priority = 10;
        p->n_sinks = 1;
        p->n_sources = 0;
        p->max_sink_channels = 2;
        p->max_source_channels = 0;

        d = PA_CARD_PROFILE_DATA(p);
        *d = PROFILE_A2DP;
        create_ports_for_profile(u, &data, p);

        pa_hashmap_put(data.profiles, p->name, p);
    }

    if (pa_bluetooth_uuid_has(device->uuids, A2DP_SOURCE_UUID)) {
        p = pa_card_profile_new("a2dp_source", _("High Fidelity Capture (A2DP)"), sizeof(enum profile));
        p->priority = 10;
        p->n_sinks = 0;
        p->n_sources = 1;
        p->max_sink_channels = 0;
        p->max_source_channels = 2;

        d = PA_CARD_PROFILE_DATA(p);
        *d = PROFILE_A2DP_SOURCE;
        create_ports_for_profile(u, &data, p);

        pa_hashmap_put(data.profiles, p->name, p);
    }

    if (pa_bluetooth_uuid_has(device->uuids, HSP_HS_UUID) ||
        pa_bluetooth_uuid_has(device->uuids, HFP_HS_UUID)) {
        p = pa_card_profile_new("hsp", _("Telephony Duplex (HSP/HFP)"), sizeof(enum profile));
        p->priority = 20;
        p->n_sinks = 1;
        p->n_sources = 1;
        p->max_sink_channels = 1;
        p->max_source_channels = 1;

        d = PA_CARD_PROFILE_DATA(p);
        *d = PROFILE_HSP;
        create_ports_for_profile(u, &data, p);

        pa_hashmap_put(data.profiles, p->name, p);
    }

    if (pa_bluetooth_uuid_has(device->uuids, HFP_AG_UUID)) {
        p = pa_card_profile_new("hfgw", _("Handsfree Gateway"), sizeof(enum profile));
        p->priority = 20;
        p->n_sinks = 1;
        p->n_sources = 1;
        p->max_sink_channels = 1;
        p->max_source_channels = 1;

        d = PA_CARD_PROFILE_DATA(p);
        *d = PROFILE_HFGW;
        create_ports_for_profile(u, &data, p);

        pa_hashmap_put(data.profiles, p->name, p);
    }

    pa_assert(!pa_hashmap_isempty(data.profiles));

    p = pa_card_profile_new("off", _("Off"), sizeof(enum profile));
    d = PA_CARD_PROFILE_DATA(p);
    *d = PROFILE_OFF;
    pa_hashmap_put(data.profiles, p->name, p);

    if ((default_profile = pa_modargs_get_value(u->modargs, "profile", NULL))) {
        if (pa_hashmap_get(data.profiles, default_profile))
            pa_card_new_data_set_profile(&data, default_profile);
        else
            pa_log_warn("Profile '%s' not valid or not supported by device.", default_profile);
    }

    u->card = pa_card_new(u->core, &data);
    pa_card_new_data_done(&data);

    if (!u->card) {
        pa_log("Failed to allocate card.");
        return -1;
    }

    u->card->userdata = u;
    u->card->set_profile = card_set_profile;

    d = PA_CARD_PROFILE_DATA(u->card->active_profile);

    if ((device->headset_state < PA_BT_AUDIO_STATE_CONNECTED && *d == PROFILE_HSP) ||
        (device->audio_sink_state < PA_BT_AUDIO_STATE_CONNECTED && *d == PROFILE_A2DP) ||
        (device->audio_source_state < PA_BT_AUDIO_STATE_CONNECTED && *d == PROFILE_A2DP_SOURCE) ||
        (device->hfgw_state < PA_BT_AUDIO_STATE_CONNECTED && *d == PROFILE_HFGW)) {
        pa_log_warn("Default profile not connected, selecting off profile");
        u->card->active_profile = pa_hashmap_get(u->card->profiles, "off");
        u->card->save_profile = FALSE;
    }

    d = PA_CARD_PROFILE_DATA(u->card->active_profile);
    u->profile = *d;

    if (USE_SCO_OVER_PCM(u))
        save_sco_volume_callbacks(u);

    return 0;
}

/* Run from main thread */
static const pa_bluetooth_device* find_device(struct userdata *u, const char *address, const char *path) {
    const pa_bluetooth_device *d = NULL;

    pa_assert(u);

    if (!address && !path) {
        pa_log_error("Failed to get device address/path from module arguments.");
        return NULL;
    }

    if (path) {
        if (!(d = pa_bluetooth_discovery_get_by_path(u->discovery, path))) {
            pa_log_error("%s is not a valid BlueZ audio device.", path);
            return NULL;
        }

        if (address && !(pa_streq(d->address, address))) {
            pa_log_error("Passed path %s address %s != %s don't match.", path, d->address, address);
            return NULL;
        }

    } else {
        if (!(d = pa_bluetooth_discovery_get_by_address(u->discovery, address))) {
            pa_log_error("%s is not known.", address);
            return NULL;
        }
    }

    if (d) {
        u->address = pa_xstrdup(d->address);
        u->path = pa_xstrdup(d->path);
    }

    return d;
}

/* Run from main thread */
static int setup_dbus(struct userdata *u) {
    DBusError err;

    dbus_error_init(&err);

    u->connection = pa_dbus_bus_get(u->core, DBUS_BUS_SYSTEM, &err);

    if (dbus_error_is_set(&err) || !u->connection) {
        pa_log("Failed to get D-Bus connection: %s", err.message);
        dbus_error_free(&err);
        return -1;
    }

    return 0;
}

int pa__init(pa_module* m) {
    pa_modargs *ma;
    uint32_t channels;
    struct userdata *u;
    const char *address, *path;
    DBusError err;
    char *mike, *speaker;
    const pa_bluetooth_device *device;

    pa_assert(m);

    dbus_error_init(&err);

    if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
        pa_log_error("Failed to parse module arguments");
        goto fail;
    }

    m->userdata = u = pa_xnew0(struct userdata, 1);
    u->module = m;
    u->core = m->core;
    u->stream_fd = -1;
    u->sample_spec = m->core->default_sample_spec;
    u->modargs = ma;

    if (pa_modargs_get_value(ma, "sco_sink", NULL) &&
        !(u->hsp.sco_sink = pa_namereg_get(m->core, pa_modargs_get_value(ma, "sco_sink", NULL), PA_NAMEREG_SINK))) {
        pa_log("SCO sink not found");
        goto fail;
    }

    if (pa_modargs_get_value(ma, "sco_source", NULL) &&
        !(u->hsp.sco_source = pa_namereg_get(m->core, pa_modargs_get_value(ma, "sco_source", NULL), PA_NAMEREG_SOURCE))) {
        pa_log("SCO source not found");
        goto fail;
    }

    if (pa_modargs_get_value_u32(ma, "rate", &u->sample_spec.rate) < 0 ||
        u->sample_spec.rate <= 0 || u->sample_spec.rate > PA_RATE_MAX) {
        pa_log_error("Failed to get rate from module arguments");
        goto fail;
    }

    u->auto_connect = TRUE;
    if (pa_modargs_get_value_boolean(ma, "auto_connect", &u->auto_connect)) {
        pa_log("Failed to parse auto_connect= argument");
        goto fail;
    }

    channels = u->sample_spec.channels;
    if (pa_modargs_get_value_u32(ma, "channels", &channels) < 0 ||
        channels <= 0 || channels > PA_CHANNELS_MAX) {
        pa_log_error("Failed to get channels from module arguments");
        goto fail;
    }
    u->sample_spec.channels = (uint8_t) channels;
    u->requested_sample_spec = u->sample_spec;

    address = pa_modargs_get_value(ma, "address", NULL);
    path = pa_modargs_get_value(ma, "path", NULL);

    if (setup_dbus(u) < 0)
        goto fail;

    if (!(u->discovery = pa_bluetooth_discovery_get(m->core)))
        goto fail;

    if (!(device = find_device(u, address, path)))
        goto fail;

    /* Add the card structure. This will also initialize the default profile */
    if (add_card(u, device) < 0)
        goto fail;

    if (!(u->msg = pa_msgobject_new(bluetooth_msg)))
        goto fail;

    u->msg->parent.process_msg = device_process_msg;
    u->msg->card = u->card;

    if (!dbus_connection_add_filter(pa_dbus_connection_get(u->connection), filter_cb, u, NULL)) {
        pa_log_error("Failed to add filter function");
        goto fail;
    }
    u->filter_added = TRUE;

    speaker = pa_sprintf_malloc("type='signal',sender='org.bluez',interface='org.bluez.Headset',member='SpeakerGainChanged',path='%s'", u->path);
    mike = pa_sprintf_malloc("type='signal',sender='org.bluez',interface='org.bluez.Headset',member='MicrophoneGainChanged',path='%s'", u->path);

    if (pa_dbus_add_matches(
                pa_dbus_connection_get(u->connection), &err,
                speaker,
                mike,
                "type='signal',sender='org.bluez',interface='org.bluez.MediaTransport',member='PropertyChanged'",
                "type='signal',sender='org.bluez',interface='org.bluez.HandsfreeGateway',member='PropertyChanged'",
                NULL) < 0) {

        pa_xfree(speaker);
        pa_xfree(mike);

        pa_log("Failed to add D-Bus matches: %s", err.message);
        goto fail;
    }

    pa_xfree(speaker);
    pa_xfree(mike);

    if (u->profile != PROFILE_OFF)
        if (init_profile(u) < 0)
            goto fail;

    if (u->sink || u->source)
        if (start_thread(u) < 0)
            goto fail;

    return 0;

fail:

    pa__done(m);

    dbus_error_free(&err);

    return -1;
}

int pa__get_n_used(pa_module *m) {
    struct userdata *u;

    pa_assert(m);
    pa_assert_se(u = m->userdata);

    return
        (u->sink ? pa_sink_linked_by(u->sink) : 0) +
        (u->source ? pa_source_linked_by(u->source) : 0);
}

void pa__done(pa_module *m) {
    struct userdata *u;

    pa_assert(m);

    if (!(u = m->userdata))
        return;

    if (u->sink && !USE_SCO_OVER_PCM(u))
        pa_sink_unlink(u->sink);

    if (u->source && !USE_SCO_OVER_PCM(u))
        pa_source_unlink(u->source);

    stop_thread(u);

    if (USE_SCO_OVER_PCM(u))
        restore_sco_volume_callbacks(u);

    if (u->connection) {

        if (u->path) {
            char *speaker, *mike;
            speaker = pa_sprintf_malloc("type='signal',sender='org.bluez',interface='org.bluez.Headset',member='SpeakerGainChanged',path='%s'", u->path);
            mike = pa_sprintf_malloc("type='signal',sender='org.bluez',interface='org.bluez.Headset',member='MicrophoneGainChanged',path='%s'", u->path);

            pa_dbus_remove_matches(pa_dbus_connection_get(u->connection), speaker, mike,
                "type='signal',sender='org.bluez',interface='org.bluez.MediaTransport',member='PropertyChanged'",
                "type='signal',sender='org.bluez',interface='org.bluez.HandsfreeGateway',member='PropertyChanged'",
                NULL);

            pa_xfree(speaker);
            pa_xfree(mike);
        }

        if (u->filter_added)
            dbus_connection_remove_filter(pa_dbus_connection_get(u->connection), filter_cb, u);

        pa_dbus_connection_unref(u->connection);
    }

    if (u->msg)
        pa_xfree(u->msg);

    if (u->card)
        pa_card_free(u->card);

    if (u->read_smoother)
        pa_smoother_free(u->read_smoother);

    if (u->a2dp.buffer)
        pa_xfree(u->a2dp.buffer);

    sbc_finish(&u->a2dp.sbc);

    if (u->modargs)
        pa_modargs_free(u->modargs);

    pa_xfree(u->address);
    pa_xfree(u->path);

    if (u->transport) {
        bt_transport_release(u);
        pa_xfree(u->transport);
    }

    if (u->discovery)
        pa_bluetooth_discovery_unref(u->discovery);

    pa_xfree(u);
}