BlueZ connection configuration done

1 files changed, 695 insertions, 33 deletions

diff --git a/src/modules/module-bt-device.c b/src/modules/module-bt-device.c
index 8690e313..21dfa4dc 100644
--- a/src/modules/module-bt-device.c
+++ b/src/modules/module-bt-device.c
@@ -17,54 +17,97 @@
     along with PulseAudio; if not, write to the Free Software
     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
     USA.
-
-    1. Connects to the BlueZ audio service via one BlueZ specific well known unix socket
-        bluez/audio/ipc: bt_audio_service_open()
-    2. Configures a connection to the BT device
-    3. Gets a BT socket fd passed in via the unix socket
-        bluez/audio/ipc: bt_audio_service_get_data_fd()
-    4. Hands this over to its RT thread.
-        pa_thread_mq
 ***/
 
 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif
 
+#include <string.h>
+
 #include <pulse/xmalloc.h>
 #include <pulsecore/module.h>
 #include <pulsecore/modargs.h>
+#include <pulsecore/thread.h>
+#include <pulsecore/thread-mq.h>
+#include <pulsecore/rtpoll.h>
+#include <pulsecore/time-smoother.h>
+#include <pulsecore/rtclock.h>
 
 #include "dbus-util.h"
 #include "module-bt-device-symdef.h"
 #include "bt-ipc.h"
+#include "bt-sbc.h"
+
+#define DEFAULT_SINK_NAME "bt_sink"
+#define BUFFER_SIZE 2048
+#define MAX_BITPOOL 64
+#define MIN_BITPOOL 2
 
 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 of the device> "
         "addr=<address of the device> "
-        "uuid=<the profile that this device will work on>");
+        "profile=<a2dp|hsp>");
+
+struct bt_a2dp {
+    sbc_capabilities_t sbc_capabilities;
+    sbc_t sbc;                           /* Codec data */
+    int sbc_initialized;                 /* Keep track if the encoder is initialized */
+    int codesize;                        /* SBC codesize */
+    int samples;                         /* Number of encoded samples */
+    uint8_t buffer[BUFFER_SIZE];         /* Codec transfer buffer */
+    int count;                           /* Codec transfer buffer counter */
+
+    int nsamples;                        /* Cumulative number of codec samples */
+    uint16_t seq_num;                    /* Cumulative packet sequence */
+    int frame_count;                     /* Current frames in buffer*/
+};
 
 struct userdata {
     pa_core *core;
     pa_module *module;
     pa_sink *sink;
 
+    pa_thread_mq thread_mq;
+    pa_rtpoll *rtpoll;
+    pa_rtpoll_item *rtpoll_item;
+    pa_thread *thread;
+
+    pa_sample_spec ss;
+    pa_smoother *smoother;
+
+    pa_memchunk memchunk;
+
+    const char *name;
     const char *addr;
-    const char *uuid;
+    const char *profile;
+    int rate;
+    int channels;
+
+    int audioservice_fd;
+    int stream_fd;
+    int transport;
+    int link_mtu;
+
+    struct bt_a2dp a2dp;
 };
 
 static const char* const valid_modargs[] = {
+    "name",
     "addr",
-    "uuid",
+    "profile",
+    "rate",
+    "channels",
     NULL
 };
 
-static int audioservice_send(int sk, const bt_audio_msg_header_t *msg) {
+static int bt_audioservice_send(int sk, const bt_audio_msg_header_t *msg) {
     int e;
-    pa_log("sending %s", bt_audio_strmsg(msg->msg_type)); /*debug*/
+    pa_log/*_debug*/("sending %s", bt_audio_strmsg(msg->msg_type));
     if (send(sk, msg, BT_AUDIO_IPC_PACKET_SIZE, 0) > 0)
         e = 0;
     else {
@@ -74,8 +117,8 @@ static int audioservice_send(int sk, const bt_audio_msg_header_t *msg) {
     return e;
 }
 
-static int audioservice_recv(int sk, bt_audio_msg_header_t *inmsg) {
-    int err;
+static int bt_audioservice_recv(int sk, bt_audio_msg_header_t *inmsg) {
+    int e;
     const char *type;
 
     pa_log/*_debug*/("trying to receive msg from audio service...");
@@ -83,67 +126,686 @@ static int audioservice_recv(int sk, bt_audio_msg_header_t *inmsg) {
         type = bt_audio_strmsg(inmsg->msg_type);
         if (type) {
             pa_log/*_debug*/("Received %s", type);
-            err = 0;
+            e = 0;
         }
         else {
-            err = -EINVAL;
+            e = -EINVAL;
             pa_log_error("Bogus message type %d received from audio service", inmsg->msg_type);
         }
     }
     else {
-        err = -errno;
+        e = -errno;
         pa_log_error("Error receiving data from audio service: %s(%d)", strerror(errno), errno);
     }
 
-    return err;
+    return e;
 }
 
-static int audioservice_expect(int sk, bt_audio_msg_header_t *rsp_hdr, int expected_type) {
-    int err = audioservice_recv(sk, rsp_hdr);
-    if (err == 0) {
+static int bt_audioservice_expect(int sk, bt_audio_msg_header_t *rsp_hdr, int expected_type) {
+    int e = bt_audioservice_recv(sk, rsp_hdr);
+    if (e == 0) {
         if (rsp_hdr->msg_type != expected_type) {
-            err = -EINVAL;
+            e = -EINVAL;
             pa_log_error("Bogus message %s received while %s was expected", bt_audio_strmsg(rsp_hdr->msg_type),
                     bt_audio_strmsg(expected_type));
         }
     }
-    return err;
+    return e;
+}
+
+static int bt_getcaps(struct userdata *u) {
+    int e;
+    char buf[BT_AUDIO_IPC_PACKET_SIZE];
+    bt_audio_rsp_msg_header_t *rsp_hdr = (void*) buf;
+    struct bt_getcapabilities_req *getcaps_req = (void*) buf;
+    struct bt_getcapabilities_rsp *getcaps_rsp = (void*) buf;
+
+    memset(getcaps_req, 0, BT_AUDIO_IPC_PACKET_SIZE);
+    getcaps_req->h.msg_type = BT_GETCAPABILITIES_REQ;
+    strncpy(getcaps_req->device, u->addr, 18);
+    if (strcasecmp(u->profile, "a2dp") == 0)
+        getcaps_req->transport = BT_CAPABILITIES_TRANSPORT_A2DP;
+    else if (strcasecmp(u->profile, "hsp") == 0)
+        getcaps_req->transport = BT_CAPABILITIES_TRANSPORT_SCO;
+    else {
+        pa_log_error("invalid profile argument: %s", u->profile);
+        return -1;
+    }
+    getcaps_req->flags = 0;
+    getcaps_req->flags |= BT_FLAG_AUTOCONNECT;
+
+    e = bt_audioservice_send(u->audioservice_fd, &getcaps_req->h);
+    if (e < 0) {
+        pa_log_error("failed to send GETCAPABILITIES_REQ");
+        return e;
+    }
+
+    e = bt_audioservice_expect(u->audioservice_fd, &rsp_hdr->msg_h, BT_GETCAPABILITIES_RSP);
+    if (e < 0) {
+        pa_log_error("failed to expect for GETCAPABILITIES_RSP");
+        return e;
+    }
+    if (rsp_hdr->posix_errno != 0) {
+        pa_log_error("BT_GETCAPABILITIES failed : %s (%d)", strerror(rsp_hdr->posix_errno), rsp_hdr->posix_errno);
+        return -rsp_hdr->posix_errno;
+    }
+
+    if ((u->transport = getcaps_rsp->transport) == BT_CAPABILITIES_TRANSPORT_A2DP)
+        u->a2dp.sbc_capabilities = getcaps_rsp->sbc_capabilities;
+
+    return 0;
+}
+
+static uint8_t default_bitpool(uint8_t freq, uint8_t mode) {
+    switch (freq) {
+        case BT_SBC_SAMPLING_FREQ_16000:
+        case BT_SBC_SAMPLING_FREQ_32000:
+            return 53;
+        case BT_SBC_SAMPLING_FREQ_44100:
+            switch (mode) {
+                case BT_A2DP_CHANNEL_MODE_MONO:
+                case BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL:
+                    return 31;
+                case BT_A2DP_CHANNEL_MODE_STEREO:
+                case BT_A2DP_CHANNEL_MODE_JOINT_STEREO:
+                    return 53;
+                default:
+                    pa_log_warn("Invalid channel mode %u", mode);
+                    return 53;
+            }
+        case BT_SBC_SAMPLING_FREQ_48000:
+            switch (mode) {
+                case BT_A2DP_CHANNEL_MODE_MONO:
+                case BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL:
+                    return 29;
+                case BT_A2DP_CHANNEL_MODE_STEREO:
+                case BT_A2DP_CHANNEL_MODE_JOINT_STEREO:
+                    return 51;
+                default:
+                    pa_log_warn("Invalid channel mode %u", mode);
+                    return 51;
+            }
+        default:
+            pa_log_warn("Invalid sampling freq %u", freq);
+            return 53;
+    }
+}
+
+static int bt_a2dp_init(struct userdata *u) {
+    sbc_capabilities_t *cap = &u->a2dp.sbc_capabilities;
+    unsigned int max_bitpool, min_bitpool, rate, channels;
+    int dir;
+
+    switch (u->rate) {
+        case 48000:
+            cap->frequency = BT_SBC_SAMPLING_FREQ_48000;
+            break;
+        case 44100:
+            cap->frequency = BT_SBC_SAMPLING_FREQ_44100;
+            break;
+        case 32000:
+            cap->frequency = BT_SBC_SAMPLING_FREQ_32000;
+            break;
+        case 16000:
+            cap->frequency = BT_SBC_SAMPLING_FREQ_16000;
+            break;
+        default:
+            pa_log_error("Rate %d not supported", rate);
+            return -1;
+    }
+
+//    if (cfg->has_channel_mode)
+//        cap->channel_mode = cfg->channel_mode;
+//    else 
+    if (channels == 2) {
+        if (cap->channel_mode & BT_A2DP_CHANNEL_MODE_JOINT_STEREO)
+            cap->channel_mode = BT_A2DP_CHANNEL_MODE_JOINT_STEREO;
+        else if (cap->channel_mode & BT_A2DP_CHANNEL_MODE_STEREO)
+            cap->channel_mode = BT_A2DP_CHANNEL_MODE_STEREO;
+        else if (cap->channel_mode & BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL)
+            cap->channel_mode = BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL;
+    } else {
+        if (cap->channel_mode & BT_A2DP_CHANNEL_MODE_MONO)
+            cap->channel_mode = BT_A2DP_CHANNEL_MODE_MONO;
+    }
+
+    if (!cap->channel_mode) {
+        pa_log_error("No supported channel modes");
+        return -1;
+    }
+
+//    if (cfg->has_block_length)
+//        cap->block_length = cfg->block_length;
+//    else 
+    if (cap->block_length & BT_A2DP_BLOCK_LENGTH_16)
+        cap->block_length = BT_A2DP_BLOCK_LENGTH_16;
+    else if (cap->block_length & BT_A2DP_BLOCK_LENGTH_12)
+        cap->block_length = BT_A2DP_BLOCK_LENGTH_12;
+    else if (cap->block_length & BT_A2DP_BLOCK_LENGTH_8)
+        cap->block_length = BT_A2DP_BLOCK_LENGTH_8;
+    else if (cap->block_length & BT_A2DP_BLOCK_LENGTH_4)
+        cap->block_length = BT_A2DP_BLOCK_LENGTH_4;
+    else {
+        pa_log_error("No supported block lengths");
+        return -1;
+    }
+
+//    if (cfg->has_subbands)
+//        cap->subbands = cfg->subbands;
+    if (cap->subbands & BT_A2DP_SUBBANDS_8)
+        cap->subbands = BT_A2DP_SUBBANDS_8;
+    else if (cap->subbands & BT_A2DP_SUBBANDS_4)
+        cap->subbands = BT_A2DP_SUBBANDS_4;
+    else {
+        pa_log_error("No supported subbands");
+        return -1;
+    }
+
+//    if (cfg->has_allocation_method)
+//        cap->allocation_method = cfg->allocation_method;
+    if (cap->allocation_method & BT_A2DP_ALLOCATION_LOUDNESS)
+        cap->allocation_method = BT_A2DP_ALLOCATION_LOUDNESS;
+    else if (cap->allocation_method & BT_A2DP_ALLOCATION_SNR)
+        cap->allocation_method = BT_A2DP_ALLOCATION_SNR;
+
+//    if (cfg->has_bitpool)
+//        min_bitpool = max_bitpool = cfg->bitpool;
+//    else {
+    min_bitpool = MAX(MIN_BITPOOL, cap->min_bitpool);
+    max_bitpool = MIN(default_bitpool(cap->frequency, cap->channel_mode), cap->max_bitpool);
+//    }
+
+    cap->min_bitpool = min_bitpool;
+    cap->max_bitpool = max_bitpool;
+
+    return 0;
+}
+
+static void bt_a2dp_setup(struct bt_a2dp *a2dp) {
+    sbc_capabilities_t active_capabilities = a2dp->sbc_capabilities;
+
+    if (a2dp->sbc_initialized)
+        sbc_reinit(&a2dp->sbc, 0);
+    else
+        sbc_init(&a2dp->sbc, 0);
+    a2dp->sbc_initialized = 1;
+
+    if (active_capabilities.frequency & BT_SBC_SAMPLING_FREQ_16000)
+        a2dp->sbc.frequency = SBC_FREQ_16000;
+
+    if (active_capabilities.frequency & BT_SBC_SAMPLING_FREQ_32000)
+        a2dp->sbc.frequency = SBC_FREQ_32000;
+
+    if (active_capabilities.frequency & BT_SBC_SAMPLING_FREQ_44100)
+        a2dp->sbc.frequency = SBC_FREQ_44100;
+
+    if (active_capabilities.frequency & BT_SBC_SAMPLING_FREQ_48000)
+        a2dp->sbc.frequency = SBC_FREQ_48000;
+
+    if (active_capabilities.channel_mode & BT_A2DP_CHANNEL_MODE_MONO)
+        a2dp->sbc.mode = SBC_MODE_MONO;
+
+    if (active_capabilities.channel_mode & BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL)
+        a2dp->sbc.mode = SBC_MODE_DUAL_CHANNEL;
+
+    if (active_capabilities.channel_mode & BT_A2DP_CHANNEL_MODE_STEREO)
+        a2dp->sbc.mode = SBC_MODE_STEREO;
+
+    if (active_capabilities.channel_mode & BT_A2DP_CHANNEL_MODE_JOINT_STEREO)
+        a2dp->sbc.mode = SBC_MODE_JOINT_STEREO;
+
+    a2dp->sbc.allocation = active_capabilities.allocation_method == BT_A2DP_ALLOCATION_SNR ? SBC_AM_SNR : SBC_AM_LOUDNESS;
+
+    switch (active_capabilities.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;
+    }
+
+    switch (active_capabilities.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;
+    }
+
+    a2dp->sbc.bitpool = active_capabilities.max_bitpool;
+    a2dp->codesize = sbc_get_codesize(&a2dp->sbc);
+//    a2dp->count = sizeof(struct rtp_header) + sizeof(struct rtp_payload);
+}
+
+static int bt_setconf(struct userdata *u) {
+    int e;
+    char buf[BT_AUDIO_IPC_PACKET_SIZE];
+    bt_audio_rsp_msg_header_t *rsp_hdr = (void*) buf;
+    struct bt_setconfiguration_req *setconf_req = (void*) buf;
+    struct bt_setconfiguration_rsp *setconf_rsp = (void*) buf;
+
+    if (u->transport == BT_CAPABILITIES_TRANSPORT_A2DP) {
+        e = bt_a2dp_init(u);
+        if (e < 0) {
+            pa_log_error("a2dp_init error");
+            return e;
+        }
+    }
+
+    memset(setconf_req, 0, BT_AUDIO_IPC_PACKET_SIZE);
+    setconf_req->h.msg_type = BT_SETCONFIGURATION_REQ;
+    strncpy(setconf_req->device, u->addr, 18);
+    setconf_req->transport = u->transport;
+    if (u->transport == BT_CAPABILITIES_TRANSPORT_A2DP)
+        setconf_req->sbc_capabilities = u->a2dp.sbc_capabilities;
+    setconf_req->access_mode = BT_CAPABILITIES_ACCESS_MODE_WRITE;
+
+    e = bt_audioservice_send(u->audioservice_fd, &setconf_req->h);
+    if (e < 0) {
+        pa_log_error("failed to send BT_SETCONFIGURATION_REQ");
+        return e;
+    }
+
+    e = bt_audioservice_expect(u->audioservice_fd, &rsp_hdr->msg_h, BT_SETCONFIGURATION_RSP);
+    if (e < 0) {
+        pa_log_error("failed to expect BT_SETCONFIGURATION_RSP");
+        return e;
+    }
+
+    if (rsp_hdr->posix_errno != 0) {
+        pa_log_error("BT_SETCONFIGURATION failed : %s(%d)", strerror(rsp_hdr->posix_errno), rsp_hdr->posix_errno);
+        return -rsp_hdr->posix_errno;
+    }
+
+    u->transport = setconf_rsp->transport;
+    u->link_mtu = setconf_rsp->link_mtu;
+
+    /* setup SBC encoder now we agree on parameters */
+    if (u->transport == BT_CAPABILITIES_TRANSPORT_A2DP) {
+        bt_a2dp_setup(&u->a2dp);
+        pa_log/*debug*/("\tallocation=%u\n\tsubbands=%u\n\tblocks=%u\n\tbitpool=%u\n",
+                u->a2dp.sbc.allocation, u->a2dp.sbc.subbands, u->a2dp.sbc.blocks, u->a2dp.sbc.bitpool);
+    }
+
+    return 0;
+}
+
+static int bt_getstreamfd(struct userdata *u) {
+    int e, opt_name;
+    char buf[BT_AUDIO_IPC_PACKET_SIZE];
+    struct bt_streamstart_req *start_req = (void*) buf;
+    bt_audio_rsp_msg_header_t *rsp_hdr = (void*) buf;
+    struct bt_streamfd_ind *streamfd_ind = (void*) buf;
+
+    memset(start_req, 0, BT_AUDIO_IPC_PACKET_SIZE);
+    start_req->h.msg_type = BT_STREAMSTART_REQ;
+
+    e = bt_audioservice_send(u->audioservice_fd, &start_req->h);
+    if (e < 0) {
+        pa_log_error("failed to send BT_STREAMSTART_REQ");
+        return e;
+    }
+
+    e = bt_audioservice_expect(u->audioservice_fd, &rsp_hdr->msg_h, BT_STREAMSTART_RSP);
+    if (e < 0) {
+        pa_log_error("failed to expect BT_STREAMSTART_RSP");
+        return e;
+    }
+
+    if (rsp_hdr->posix_errno != 0) {
+        pa_log_error("BT_START failed : %s(%d)", strerror(rsp_hdr->posix_errno), rsp_hdr->posix_errno);
+        return -rsp_hdr->posix_errno;
+    }
+
+    e = bt_audioservice_expect(u->audioservice_fd, &streamfd_ind->h, BT_STREAMFD_IND);
+    if (e < 0) {
+        pa_log_error("failed to expect BT_STREAMFD_IND");
+        return e;
+    }
+
+    if (u->stream_fd >= 0)
+        close(u->stream_fd);
+
+    u->stream_fd = bt_audio_service_get_data_fd(u->audioservice_fd);
+    if (u->stream_fd < 0) {
+        pa_log_error("failed to get data fd");
+        return -errno;
+    }
+
+//    if (u->transport == BT_CAPABILITIES_TRANSPORT_A2DP) {
+//        opt_name = SO_SNDTIMEO;
+//        if (setsockopt(u->stream_fd, SOL_SOCKET, opt_name, &t, sizeof(t)) < 0) {
+//            pa_log_error("failed to set socket options for A2DP");
+//            return -errno;
+//        }
+//    }
+//    else {
+//        opt_name = SCO_TXBUFS;
+//        if (setsockopt(u->stream_fd, SOL_SCO, opt_name, &period_count, sizeof(period_count)) == 0)
+//            return 0;
+//        opt_name = SO_SNDBUF;
+//        if (setsockopt(u->stream_fd, SOL_SCO, opt_name, &period_count, sizeof(period_count)) == 0)
+//            return 0;
+//        /* FIXME : handle error codes */
+//    }
+
+    return 0;
+}
+
+static int bt_hw_constraint(struct userdata *u) {
+    /*TODO: A2DP */
+    u->ss.format = PA_SAMPLE_S16LE;
+    u->ss.rate = 8000;
+    u->ss.channels = 1;
+    return 0;
+}
+
+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;
+
+    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));
+                    pa_smoother_pause(u->smoother, pa_rtclock_usec());
+                    break;
+                case PA_SINK_IDLE:
+                case PA_SINK_RUNNING:
+                    if (u->sink->thread_info.state == PA_SINK_SUSPENDED)
+                        pa_smoother_resume(u->smoother, pa_rtclock_usec());
+                    break;
+                case PA_SINK_UNLINKED:
+                case PA_SINK_INIT:
+                    ;
+            }
+            break;
+
+        case PA_SINK_MESSAGE_GET_LATENCY: {
+//            pa_usec_t w, r;
+//            r = pa_smoother_get(u->smoother, pa_rtclock_usec());
+//            w = pa_bytes_to_usec(u->offset + u->memchunk.length, &u->sink->sample_spec);
+//            *((pa_usec_t*) data) = w > r ? w - r : 0;
+            break;
+        }
+
+//        case SINK_MESSAGE_PASS_SOCKET: {
+//            struct pollfd *pollfd;
+//            pa_assert(!u->rtpoll_item);
+//            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->fd;
+//            pollfd->events = pollfd->revents = 0;
+//            return 0;
+//        }
+    }
+
+    return pa_sink_process_msg(o, code, data, offset, chunk);
+}
+
+static void thread_func(void *userdata) {
+//    struct userdata *u = userdata;
+//    int write_type = 0;
+//
+//    pa_assert(u);
+//
+//    pa_log_debug("Thread starting up");
+//
+//    pa_thread_mq_install(&u->thread_mq);
+//    pa_rtpoll_install(u->rtpoll);
+//
+//    pa_smoother_set_time_offset(u->smoother, pa_rtclock_usec());
+//
+//    for (;;) {
+//        int ret;
+//
+//        if (PA_SINK_IS_OPENED(u->sink->thread_info.state))
+//            if (u->sink->thread_info.rewind_requested)
+//                pa_sink_process_rewind(u->sink, 0);
+//
+//        if (u->rtpoll_item) {
+//            struct pollfd *pollfd;
+//            pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
+//
+//            /* Render some data and write it to the fifo */
+//            if (PA_SINK_IS_OPENED(u->sink->thread_info.state) && pollfd->revents) {
+//                pa_usec_t usec;
+//                int64_t n;
+//
+//                for (;;) {
+//                    ssize_t l;
+//                    void *p;
+//
+//                    if (u->memchunk.length <= 0)
+//                        pa_sink_render(u->sink, u->block_size, &u->memchunk);
+//
+//                    pa_assert(u->memchunk.length > 0);
+//
+//                    p = pa_memblock_acquire(u->memchunk.memblock);
+//                    l = pa_write(u->fd, (uint8_t*) p + u->memchunk.index, u->memchunk.length, &write_type);
+//                    pa_memblock_release(u->memchunk.memblock);
+//
+//                    pa_assert(l != 0);
+//
+//                    if (l < 0) {
+//
+//                        if (errno == EINTR)
+//                            continue;
+//                        else if (errno == EAGAIN) {
+//
+//                            /* OK, we filled all socket buffers up
+//                             * now. */
+//                            goto filled_up;
+//
+//                        } else {
+//                            pa_log("Failed to write data to FIFO: %s", pa_cstrerror(errno));
+//                            goto fail;
+//                        }
+//
+//                    } else {
+//                        u->offset += l;
+//
+//                        u->memchunk.index += l;
+//                        u->memchunk.length -= l;
+//
+//                        if (u->memchunk.length <= 0) {
+//                            pa_memblock_unref(u->memchunk.memblock);
+//                            pa_memchunk_reset(&u->memchunk);
+//                        }
+//
+//                        pollfd->revents = 0;
+//
+//                        if (u->memchunk.length > 0)
+//
+//                            /* OK, we wrote less that we asked for,
+//                             * hence we can assume that the socket
+//                             * buffers are full now */
+//                            goto filled_up;
+//                    }
+//                }
+//
+//            filled_up:
+//
+//                /* At this spot we know that the socket buffers are
+//                 * fully filled up. This is the best time to estimate
+//                 * the playback position of the server */
+//
+//                n = u->offset;
+//
+//#ifdef SIOCOUTQ
+//                {
+//                    int l;
+//                    if (ioctl(u->fd, SIOCOUTQ, &l) >= 0 && l > 0)
+//                        n -= l;
+//                }
+//#endif
+//
+//                usec = pa_bytes_to_usec(n, &u->sink->sample_spec);
+//
+//                if (usec > u->latency)
+//                    usec -= u->latency;
+//                else
+//                    usec = 0;
+//
+//                pa_smoother_put(u->smoother, pa_rtclock_usec(), usec);
+//            }
+//
+//            /* Hmm, nothing to do. Let's sleep */
+//            pollfd->events = PA_SINK_IS_OPENED(u->sink->thread_info.state) ? POLLOUT : 0;
+//        }
+//
+//        if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0)
+//            goto fail;
+//
+//        if (ret == 0)
+//            goto finish;
+//
+//        if (u->rtpoll_item) {
+//            struct pollfd* pollfd;
+//
+//            pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
+//
+//            if (pollfd->revents & ~POLLOUT) {
+//                pa_log("FIFO shutdown.");
+//                goto fail;
+//            }
+//        }
+//    }
+//
+//fail:
+//    /* If this was no regular exit from the loop we have to continue
+//     * processing messages until we received PA_MESSAGE_SHUTDOWN */
+//    pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
+//    pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
+//
+//finish:
+//    pa_log_debug("Thread shutting down");
 }
 
 int pa__init(pa_module* m) {
+    int e;
+    char *rate, *channels;
     pa_modargs *ma;
+    pa_sink_new_data data;
     struct userdata *u;
-    int sk = -1;
 
     pa_assert(m);
     m->userdata = u = pa_xnew0(struct userdata, 1);
     u->module = m;
+    u->core = m->core;
+    u->audioservice_fd = -1;
+    u->stream_fd = -1;
+    u->transport = -1;
+    u->smoother = pa_smoother_new(PA_USEC_PER_SEC, PA_USEC_PER_SEC*2, TRUE, 10);
+    pa_memchunk_reset(&u->memchunk);
+    u->rtpoll = pa_rtpoll_new();
+    pa_thread_mq_init(&u->thread_mq, u->core->mainloop, u->rtpoll);
+    u->rtpoll_item = NULL;
 
     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
         pa_log_error("failed to parse module arguments");
         goto fail;
     }
+    if (!(u->name = pa_modargs_get_value(ma, "name", DEFAULT_SINK_NAME))) {
+        pa_log_error("failed to get device address from module arguments");
+        goto fail;
+    }
     if (!(u->addr = pa_modargs_get_value(ma, "addr", NULL))) {
-        pa_log_error("failed to parse device address from module arguments");
+        pa_log_error("failed to get device address from module arguments");
         goto fail;
     }
-    if (!(u->uuid = pa_modargs_get_value(ma, "uuid", NULL))) {
-        pa_log_error("failed to parse device uuid from module arguments");
+    if (!(u->profile = pa_modargs_get_value(ma, "profile", NULL))) {
+        pa_log_error("failed to get profile from module arguments");
         goto fail;
     }
-    pa_log("Loading module-bt-device for %s, UUID=%s", u->addr, u->uuid);
+    if (!(rate = pa_modargs_get_value(ma, "rate", NULL))) {
+        pa_log_error("failed to get rate from module arguments");
+        goto fail;
+    }
+    u->rate = atoi(rate);
+    if (!(channels = pa_modargs_get_value(ma, "channels", NULL))) {
+        pa_log_error("failed to get profile from module arguments");
+        goto fail;
+    }
+    u->channels = atoi(channels);
+    pa_log("Loading module-bt-device for %s (%s), profile %s", u->name, u->addr, u->profile);
 
-    /* Connects to the BlueZ audio service via one BlueZ specific well known unix socket */
-    sk = bt_audio_service_open();
-    if (sk <= 0) {
+    /* connect to the bluez audio service */
+    u->audioservice_fd = bt_audio_service_open();
+    if (u->audioservice_fd <= 0) {
         pa_log_error("couldn't connect to bluetooth audio service");
         goto fail;
     }
-    pa_log("socket to audio service: %d", sk); /*debug*/
 
+    /* queries device capabilities */
+    e = bt_getcaps(u);
+    if (e < 0) {
+        pa_log_error("failed to get device capabilities");
+        goto fail;
+    }
+
+    /* configures the connection */
+    e = bt_setconf(u);
+    if (e < 0) {
+        pa_log_error("failed to set config");
+        goto fail;
+    }
+
+    /* gets the device socket */
+    e = bt_getstreamfd(u);
+    if (e < 0) {
+        pa_log_error("failed to get stream fd (%d)", e);
+        goto fail;
+    }
+
+    /* configure hw supported sample specs */
+    e = bt_hw_constraint(u);
+    if (e < 0) {
+        pa_log_error("failed to configure sample spec");
+        goto fail;
+    }
+
+    /* create sink */
+    pa_sink_new_data_init(&data);
+    data.driver = __FILE__;
+    data.module = m;
+    pa_sink_new_data_set_name(&data, u->name);
+    pa_sink_new_data_set_sample_spec(&data, &u->ss);
+    pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, u->name);
+    pa_proplist_setf(data.proplist, PA_PROP_DEVICE_DESCRIPTION, "Bluetooth sink '%s' (%s)", u->name, u->addr);
+    u->sink = pa_sink_new(m->core, &data, PA_SINK_HARDWARE|PA_SINK_NETWORK);
+    pa_sink_new_data_done(&data);
+    if (!u->sink) {
+        pa_log_error("failed to create sink");
+        goto fail;
+    }
+    u->sink->userdata = u;
+    u->sink->parent.process_msg = sink_process_msg;
+    pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
+    pa_sink_set_rtpoll(u->sink, u->rtpoll);
+
+    /* start rt thread */
+    if (!(u->thread = pa_thread_new(thread_func, u))) {
+        pa_log_error("failed to create thread");
+        goto fail;
+    }
+    pa_sink_put(u->sink);
+
+    pa_modargs_free(ma);
     return 0;
 
 fail:
+    if (ma)
+        pa_modargs_free(ma);
     pa__done(m);
     return -1;
 }