Move bluetooth discover and device modules to src/modules/bluetooth

1 files changed, 949 insertions, 0 deletions

diff --git a/src/modules/bluetooth/module-bluetooth-device.c b/src/modules/bluetooth/module-bluetooth-device.c
new file mode 100644
index 00000000..335a8ed5
--- /dev/null
+++ b/src/modules/bluetooth/module-bluetooth-device.c
@@ -0,0 +1,949 @@
+/***
+    This file is part of PulseAudio.
+
+    Copyright 2008 Joao Paulo Rechi Vita
+
+    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 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 <poll.h>
+#include <sys/ioctl.h>
+#include <linux/sockios.h>
+#include <arpa/inet.h>
+
+#include <pulse/xmalloc.h>
+#include <pulse/timeval.h>
+#include <pulse/sample.h>
+#include <pulsecore/module.h>
+#include <pulsecore/modargs.h>
+#include <pulsecore/core-util.h>
+#include <pulsecore/core-error.h>
+#include <pulsecore/socket-util.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-bluetooth-device-symdef.h"
+#include "ipc.h"
+#include "sbc.h"
+#include "rtp.h"
+
+#define DEFAULT_SINK_NAME "bluetooth_sink"
+#define BUFFER_SIZE 2048
+#define MAX_BITPOOL 64
+#define MIN_BITPOOL 2
+#define SOL_SCO 17
+#define SCO_TXBUFS 0x03
+#define SCO_RXBUFS 0x04
+
+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> "
+        "profile=<a2dp|hsp>");
+
+struct bt_a2dp {
+    sbc_capabilities_t sbc_capabilities;
+    sbc_t sbc;                           /* Codec data */
+    pa_bool_t 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 */
+
+    uint32_t 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;
+
+    int64_t offset;
+    pa_smoother *smoother;
+
+    pa_memchunk memchunk;
+    pa_mempool *mempool;
+
+    char *name;
+    char *addr;
+    char *profile;
+    pa_sample_spec ss;
+
+    int audioservice_fd;
+    int stream_fd;
+
+    int transport;
+    char *strtransport;
+    int link_mtu;
+    size_t block_size;
+    pa_usec_t latency;
+
+    struct bt_a2dp a2dp;
+};
+
+static const char* const valid_modargs[] = {
+    "name",
+    "addr",
+    "profile",
+    "rate",
+    "channels",
+    NULL
+};
+
+static int bt_audioservice_send(int sk, const bt_audio_msg_header_t *msg) {
+    int e;
+    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 {
+        e = -errno;
+        pa_log_error("Error sending data to audio service: %s(%d)", pa_cstrerror(errno), errno);
+    }
+    return e;
+}
+
+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...");
+    if (recv(sk, inmsg, BT_AUDIO_IPC_PACKET_SIZE, 0) > 0) {
+        type = bt_audio_strmsg(inmsg->msg_type);
+        if (type) {
+            pa_log_debug("Received %s", type);
+            e = 0;
+        }
+        else {
+            e = -EINVAL;
+            pa_log_error("Bogus message type %d received from audio service", inmsg->msg_type);
+        }
+    }
+    else {
+        e = -errno;
+        pa_log_error("Error receiving data from audio service: %s(%d)", pa_cstrerror(errno), errno);
+    }
+
+    return e;
+}
+
+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) {
+            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 e;
+}
+
+static int bt_getcaps(struct userdata *u) {
+    int e;
+    union {
+        bt_audio_rsp_msg_header_t rsp_hdr;
+        struct bt_getcapabilities_req getcaps_req;
+        struct bt_getcapabilities_rsp getcaps_rsp;
+        uint8_t buf[BT_AUDIO_IPC_PACKET_SIZE];
+    } msg;
+
+    memset(msg.buf, 0, BT_AUDIO_IPC_PACKET_SIZE);
+    msg.getcaps_req.h.msg_type = BT_GETCAPABILITIES_REQ;
+    strncpy(msg.getcaps_req.device, u->addr, 18);
+    if (strcasecmp(u->profile, "a2dp") == 0)
+        msg.getcaps_req.transport = BT_CAPABILITIES_TRANSPORT_A2DP;
+    else if (strcasecmp(u->profile, "hsp") == 0)
+        msg.getcaps_req.transport = BT_CAPABILITIES_TRANSPORT_SCO;
+    else {
+        pa_log_error("invalid profile argument: %s", u->profile);
+        return -1;
+    }
+    msg.getcaps_req.flags = BT_FLAG_AUTOCONNECT;
+
+    e = bt_audioservice_send(u->audioservice_fd, &msg.getcaps_req.h);
+    if (e < 0) {
+        pa_log_error("failed to send GETCAPABILITIES_REQ");
+        return e;
+    }
+
+    e = bt_audioservice_expect(u->audioservice_fd, &msg.rsp_hdr.msg_h, BT_GETCAPABILITIES_RSP);
+    if (e < 0) {
+        pa_log_error("failed to expect for GETCAPABILITIES_RSP");
+        return e;
+    }
+    if (msg.rsp_hdr.posix_errno != 0) {
+        pa_log_error("BT_GETCAPABILITIES failed : %s (%d)", pa_cstrerror(msg.rsp_hdr.posix_errno), msg.rsp_hdr.posix_errno);
+        return -msg.rsp_hdr.posix_errno;
+    }
+
+    if ((u->transport = msg.getcaps_rsp.transport) == BT_CAPABILITIES_TRANSPORT_A2DP)
+        u->a2dp.sbc_capabilities = msg.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;
+
+    switch (u->ss.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", u->ss.rate);
+            return -1;
+    }
+
+    if (u->ss.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 (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 (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 (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;
+
+    min_bitpool = PA_MAX(MIN_BITPOOL, cap->min_bitpool);
+    max_bitpool = PA_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 = TRUE;
+
+    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;
+    union {
+        bt_audio_rsp_msg_header_t rsp_hdr;
+        struct bt_setconfiguration_req setconf_req;
+        struct bt_setconfiguration_rsp setconf_rsp;
+        uint8_t buf[BT_AUDIO_IPC_PACKET_SIZE];
+    } msg;
+
+    if (u->transport == BT_CAPABILITIES_TRANSPORT_A2DP) {
+        e = bt_a2dp_init(u);
+        if (e < 0) {
+            pa_log_error("a2dp_init error");
+            return e;
+        }
+        u->ss.format = PA_SAMPLE_S16LE;
+    }
+    else
+        u->ss.format = PA_SAMPLE_U8;
+
+    memset(msg.buf, 0, BT_AUDIO_IPC_PACKET_SIZE);
+    msg.setconf_req.h.msg_type = BT_SETCONFIGURATION_REQ;
+    strncpy(msg.setconf_req.device, u->addr, 18);
+    msg.setconf_req.transport = u->transport;
+    if (u->transport == BT_CAPABILITIES_TRANSPORT_A2DP)
+        msg.setconf_req.sbc_capabilities = u->a2dp.sbc_capabilities;
+    msg.setconf_req.access_mode = BT_CAPABILITIES_ACCESS_MODE_WRITE;
+
+    e = bt_audioservice_send(u->audioservice_fd, &msg.setconf_req.h);
+    if (e < 0) {
+        pa_log_error("failed to send BT_SETCONFIGURATION_REQ");
+        return e;
+    }
+
+    e = bt_audioservice_expect(u->audioservice_fd, &msg.rsp_hdr.msg_h, BT_SETCONFIGURATION_RSP);
+    if (e < 0) {
+        pa_log_error("failed to expect BT_SETCONFIGURATION_RSP");
+        return e;
+    }
+
+    if (msg.rsp_hdr.posix_errno != 0) {
+        pa_log_error("BT_SETCONFIGURATION failed : %s(%d)", pa_cstrerror(msg.rsp_hdr.posix_errno), msg.rsp_hdr.posix_errno);
+        return -msg.rsp_hdr.posix_errno;
+    }
+
+    u->transport = msg.setconf_rsp.transport;
+    u->strtransport = (u->transport == BT_CAPABILITIES_TRANSPORT_A2DP ? pa_xstrdup("A2DP") : pa_xstrdup("SCO"));
+    u->link_mtu = msg.setconf_rsp.link_mtu;
+
+    /* setup SBC encoder now we agree on parameters */
+    if (u->transport == BT_CAPABILITIES_TRANSPORT_A2DP) {
+        bt_a2dp_setup(&u->a2dp);
+        u->block_size = u->a2dp.codesize;
+        pa_log_info("sbc parameters:\n\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);
+    }
+    else
+        u->block_size = u->link_mtu;
+
+    return 0;
+}
+
+static int bt_getstreamfd(struct userdata *u) {
+    int e;
+//    uint32_t period_count = io->buffer_size / io->period_size;
+    union {
+        bt_audio_rsp_msg_header_t rsp_hdr;
+        struct bt_streamstart_req start_req;
+        struct bt_streamfd_ind streamfd_ind;
+        uint8_t buf[BT_AUDIO_IPC_PACKET_SIZE];
+    } msg;
+
+    memset(msg.buf, 0, BT_AUDIO_IPC_PACKET_SIZE);
+    msg.start_req.h.msg_type = BT_STREAMSTART_REQ;
+
+    e = bt_audioservice_send(u->audioservice_fd, &msg.start_req.h);
+    if (e < 0) {
+        pa_log_error("failed to send BT_STREAMSTART_REQ");
+        return e;
+    }
+
+    e = bt_audioservice_expect(u->audioservice_fd, &msg.rsp_hdr.msg_h, BT_STREAMSTART_RSP);
+    if (e < 0) {
+        pa_log_error("failed to expect BT_STREAMSTART_RSP");
+        return e;
+    }
+
+    if (msg.rsp_hdr.posix_errno != 0) {
+        pa_log_error("BT_START failed : %s(%d)", pa_cstrerror(msg.rsp_hdr.posix_errno), msg.rsp_hdr.posix_errno);
+        return -msg.rsp_hdr.posix_errno;
+    }
+
+    e = bt_audioservice_expect(u->audioservice_fd, &msg.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)
+        pa_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: %s (%d)",pa_cstrerror(errno), errno);
+        return -errno;
+    }
+
+    if (u->transport == BT_CAPABILITIES_TRANSPORT_A2DP) {
+        if (pa_socket_set_sndbuf(u->stream_fd, 10*u->link_mtu) < 0) {
+            pa_log_error("failed to set socket options for A2DP: %s (%d)",pa_cstrerror(errno), errno);
+            return -errno;
+        }
+    }
+
+//   if (setsockopt(u->stream_fd, SOL_SCO, SCO_TXBUFS, &period_count, sizeof(period_count)) == 0)
+//       return 0;
+//   if (setsockopt(u->stream_fd, SOL_SCO, SO_SNDBUF, &period_count, sizeof(period_count)) == 0)
+//       return 0;
+//   /* FIXME : handle error codes */
+    pa_make_fd_nonblock(u->stream_fd);
+//    pa_make_socket_low_delay(u->stream_fd);
+
+    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;
+
+    pa_log_debug("got message: %d", code);
+    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;
+            return 0;
+        }
+
+    }
+
+    return pa_sink_process_msg(o, code, data, offset, chunk);
+}
+
+static int sco_process_render(struct userdata *u) {
+    void *p;
+    ssize_t l;
+    int write_type = 0;
+
+    u->memchunk.memblock = pa_memblock_new(u->mempool, u->block_size);
+    pa_log_debug("memblock asked size %d", u->block_size);
+    u->memchunk.length = pa_memblock_get_length(u->memchunk.memblock);
+    pa_log_debug("memchunk length %d", u->memchunk.length);
+    pa_sink_render_into_full(u->sink, &u->memchunk);
+
+    pa_assert(u->memchunk.length > 0);
+
+    p = pa_memblock_acquire(u->memchunk.memblock);
+
+sco_write:
+    l = pa_write(u->stream_fd, (uint8_t*) p, u->memchunk.length, &write_type);
+    pa_log_debug("memblock written to socket: %d bytes", l);
+
+    pa_assert(l != 0);
+
+    if (l < 0) {
+        if (errno == EINTR) {
+            pa_log_debug("EINTR");
+            goto sco_write;
+        }
+        else if (errno == EAGAIN) {
+            pa_log_debug("EAGAIN");
+            goto sco_write;
+        }
+        else {
+            pa_memblock_release(u->memchunk.memblock);
+            pa_memblock_unref(u->memchunk.memblock);
+            pa_memchunk_reset(&u->memchunk);
+            pa_log_debug("memchunk reseted");
+            pa_log_error("Failed to write data to FIFO: %s", pa_cstrerror(errno));
+            return -1;
+        }
+    } else {
+        pa_memblock_release(u->memchunk.memblock);
+        pa_memblock_unref(u->memchunk.memblock);
+        pa_memchunk_reset(&u->memchunk);
+        pa_log_debug("memchunk reseted");
+        u->offset += l;
+        return 0;
+    }
+}
+
+static int a2dp_process_render(struct userdata *u) {
+    ssize_t l;
+    int write_type = 0, written;
+    struct bt_a2dp *a2dp = &u->a2dp;
+    struct rtp_header *header = (void *) a2dp->buffer;
+    struct rtp_payload *payload = (void *) (a2dp->buffer + sizeof(*header));
+
+    pa_assert(u);
+
+    do {
+        /* Render some data */
+        int frame_size, encoded;
+        void *p;
+
+        u->memchunk.memblock = pa_memblock_new(u->mempool, u->block_size);
+        pa_log_debug("memblock asked size %d", u->block_size);
+        u->memchunk.length = pa_memblock_get_length(u->memchunk.memblock);
+        pa_log_debug("memchunk length %d", u->memchunk.length);
+        pa_sink_render_into_full(u->sink, &u->memchunk);
+
+        pa_assert(u->memchunk.length > 0);
+
+        p = pa_memblock_acquire(u->memchunk.memblock);
+        frame_size = sbc_get_frame_length(&a2dp->sbc);
+        pa_log_debug("SBC frame_size: %d", frame_size);
+
+        encoded = sbc_encode(&a2dp->sbc, (uint8_t*) p, a2dp->codesize, a2dp->buffer + a2dp->count,
+                sizeof(a2dp->buffer) - a2dp->count, &written);
+        pa_log_debug("SBC: encoded: %d; written: %d", encoded, written);
+        if (encoded <= 0) {
+            pa_log_error("SBC encoding error (%d)", encoded);
+            return -1;
+        }
+        pa_memblock_release(u->memchunk.memblock);
+        pa_memblock_unref(u->memchunk.memblock);
+        pa_memchunk_reset(&u->memchunk);
+        pa_log_debug("memchunk reseted");
+
+        a2dp->count += written;
+        a2dp->frame_count++;
+        a2dp->samples += encoded / frame_size;
+        a2dp->nsamples += encoded / frame_size;
+
+    } while (a2dp->count + written <= u->link_mtu);
+
+    /* write it to the fifo */
+    memset(a2dp->buffer, 0, sizeof(*header) + sizeof(*payload));
+    payload->frame_count = a2dp->frame_count;
+    header->v = 2;
+    header->pt = 1;
+    header->sequence_number = htons(a2dp->seq_num);
+    header->timestamp = htonl(a2dp->nsamples);
+    header->ssrc = htonl(1);
+
+avdtp_write:
+    l = pa_write(u->stream_fd, a2dp->buffer, a2dp->count, &write_type);
+    pa_log_debug("avdtp_write: requested %d bytes; written %d bytes", a2dp->count, l);
+
+    pa_assert(l != 0);
+
+    if (l < 0) {
+        if (errno == EINTR) {
+            pa_log_debug("EINTR");
+            goto avdtp_write;
+        }
+        else if (errno == EAGAIN) {
+            pa_log_debug("EAGAIN");
+            goto avdtp_write;
+        }
+        else {
+            pa_log_error("Failed to write data to FIFO: %s", pa_cstrerror(errno));
+            return -1;
+        }
+    }
+
+    u->offset += a2dp->codesize*a2dp->frame_count;
+
+    /* Reset buffer of data to send */
+    a2dp->count = sizeof(struct rtp_header) + sizeof(struct rtp_payload);
+    a2dp->frame_count = 0;
+    a2dp->samples = 0;
+    a2dp->seq_num++;
+
+    return 0;
+}
+
+static void thread_func(void *userdata) {
+    struct userdata *u = userdata;
+
+    pa_assert(u);
+
+    pa_log_debug("IO 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, l;
+        struct pollfd *pollfd;
+        uint64_t n;
+        pa_usec_t usec;
+
+        if (PA_SINK_IS_OPENED(u->sink->thread_info.state)) {
+            if (u->sink->thread_info.rewind_requested) {
+                pa_sink_process_rewind(u->sink, 0);
+            }
+        }
+
+        pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
+
+        if (PA_SINK_IS_OPENED(u->sink->thread_info.state) && pollfd->revents) {
+            if (u->transport == BT_CAPABILITIES_TRANSPORT_A2DP) {
+                if ((l = a2dp_process_render(u)) < 0)
+                    goto fail;
+            }
+            else {
+                if ((l = sco_process_render(u)) < 0)
+                    goto fail;
+            }
+            pollfd->revents = 0;
+
+            /* feed the time smoother */
+            n = u->offset;
+            if (ioctl(u->stream_fd, SIOCOUTQ, &l) >= 0 && l > 0)
+                n -= l;
+            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 */
+        pa_log_debug("IO thread going to sleep");
+        pollfd->events = PA_SINK_IS_OPENED(u->sink->thread_info.state) ? POLLOUT : 0;
+        if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0) {
+            pa_log_error("rtpoll_run < 0");
+            goto fail;
+        }
+        pa_log_debug("IO thread waking up");
+
+        if (ret == 0) {
+            pa_log_debug("rtpoll_run == 0");
+            goto finish;
+        }
+
+        pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
+        if (pollfd->revents & ~POLLOUT) {
+            pa_log_error("FIFO shutdown.");
+            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(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("IO thread shutting down");
+}
+
+int pa__init(pa_module* m) {
+    int e;
+    pa_modargs *ma;
+    uint32_t channels;
+    pa_sink_new_data data;
+    struct pollfd *pollfd;
+    struct userdata *u;
+
+    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->offset = 0;
+    u->latency = 0;
+    u->a2dp.sbc_initialized = FALSE;
+    u->smoother = pa_smoother_new(PA_USEC_PER_SEC, PA_USEC_PER_SEC*2, TRUE, 10);
+    u->mempool = pa_mempool_new(FALSE);
+    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_xstrdup(pa_modargs_get_value(ma, "name", DEFAULT_SINK_NAME)))) {
+        pa_log_error("failed to get device name from module arguments");
+        goto fail;
+    }
+    if (!(u->addr = pa_xstrdup(pa_modargs_get_value(ma, "addr", NULL)))) {
+        pa_log_error("failed to get device address from module arguments");
+        goto fail;
+    }
+    if (!(u->profile = pa_xstrdup(pa_modargs_get_value(ma, "profile", NULL)))) {
+        pa_log_error("failed to get profile from module arguments");
+        goto fail;
+    }
+    if (pa_modargs_get_value_u32(ma, "rate", &u->ss.rate) < 0) {
+        pa_log_error("failed to get rate from module arguments");
+        goto fail;
+    }
+    if (pa_modargs_get_value_u32(ma, "channels", &channels) < 0) {
+        pa_log_error("failed to get channels from module arguments");
+        goto fail;
+    }
+    u->ss.channels = (uint8_t) channels;
+
+    /* 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_debug("connected to the bluetooth audio service");
+
+    /* queries device capabilities */
+    e = bt_getcaps(u);
+    if (e < 0) {
+        pa_log_error("failed to get device capabilities");
+        goto fail;
+    }
+    pa_log_debug("got device capabilities");
+
+    /* configures the connection */
+    e = bt_setconf(u);
+    if (e < 0) {
+        pa_log_error("failed to set config");
+        goto fail;
+    }
+    pa_log_debug("connection to the device configured");
+
+    /* gets the device socket */
+    e = bt_getstreamfd(u);
+    if (e < 0) {
+        pa_log_error("failed to get stream fd (%d)", e);
+        goto fail;
+    }
+    pa_log_debug("got the device socket");
+
+    /* 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 %s '%s' (%s)", u->strtransport, u->name, u->addr);
+    pa_proplist_setf(data.proplist, "bluetooth.protocol", u->profile);
+    pa_proplist_setf(data.proplist, PA_PROP_DEVICE_API, "bluez");
+    pa_proplist_setf(data.proplist, PA_PROP_DEVICE_CLASS, "sound");
+    pa_proplist_setf(data.proplist, PA_PROP_DEVICE_CONNECTOR, "bluetooth");
+    pa_proplist_setf(data.proplist, PA_PROP_DEVICE_FORM_FACTOR, "headset"); /*FIXME*/
+    pa_proplist_setf(data.proplist, PA_PROP_DEVICE_VENDOR_PRODUCT_ID, "product_id"); /*FIXME*/
+    pa_proplist_setf(data.proplist, PA_PROP_DEVICE_SERIAL, "serial"); /*FIXME*/
+    u->sink = pa_sink_new(m->core, &data, PA_SINK_HARDWARE|PA_SINK_LATENCY);
+    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);
+
+    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;
+
+    /* start rt thread */
+    if (!(u->thread = pa_thread_new(thread_func, u))) {
+        pa_log_error("failed to create IO 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;
+}
+
+void pa__done(pa_module *m) {
+    struct userdata *u;
+    pa_assert(m);
+
+    if (!(u = m->userdata))
+        return;
+
+    if (u->sink)
+        pa_sink_unlink(u->sink);
+
+    if (u->thread) {
+        pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
+        pa_thread_free(u->thread);
+    }
+
+    pa_thread_mq_done(&u->thread_mq);
+
+    if (u->sink)
+        pa_sink_unref(u->sink);
+
+    if (u->rtpoll_item)
+        pa_rtpoll_item_free(u->rtpoll_item);
+
+    if (u->rtpoll)
+        pa_rtpoll_free(u->rtpoll);
+
+    if (u->memchunk.memblock)
+        pa_memblock_unref(u->memchunk.memblock);
+
+    if (u->mempool)
+        pa_mempool_free(u->mempool);
+
+    if (u->smoother)
+        pa_smoother_free(u->smoother);
+
+    if (u->name)
+        pa_xfree(u->name);
+
+    if (u->addr)
+        pa_xfree(u->addr);
+
+    if (u->profile)
+        pa_xfree(u->profile);
+
+    if (u->stream_fd >= 0)
+        pa_close(u->stream_fd);
+
+    if (u->audioservice_fd >= 0)
+        pa_close(u->audioservice_fd);
+
+    pa_xfree(u);
+}