module-bluez5-device.c 71.3 KB
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/***
  This file is part of PulseAudio.

  Copyright 2008-2013 João Paulo Rechi Vita
  Copyright 2011-2013 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 <errno.h>

#include <arpa/inet.h>
#include <sbc/sbc.h>

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

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

#include "a2dp-codecs.h"
#include "bluez5-util.h"
#include "rtp.h"

#include "module-bluez5-device-symdef.h"

PA_MODULE_AUTHOR("João Paulo Rechi Vita");
PA_MODULE_DESCRIPTION("BlueZ 5 Bluetooth audio sink and source");
PA_MODULE_VERSION(PACKAGE_VERSION);
PA_MODULE_LOAD_ONCE(false);
PA_MODULE_USAGE("path=<device object path>");

#define MAX_PLAYBACK_CATCH_UP_USEC (100 * PA_USEC_PER_MSEC)
#define FIXED_LATENCY_PLAYBACK_A2DP (25 * PA_USEC_PER_MSEC)
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#define FIXED_LATENCY_PLAYBACK_SCO (125 * PA_USEC_PER_MSEC)
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#define FIXED_LATENCY_RECORD_A2DP   (25 * PA_USEC_PER_MSEC)
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#define FIXED_LATENCY_RECORD_SCO    (25 * PA_USEC_PER_MSEC)
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#define BITPOOL_DEC_LIMIT 32
#define BITPOOL_DEC_STEP 5
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#define HSP_MAX_GAIN 15
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static const char* const valid_modargs[] = {
    "path",
    NULL
};

enum {
    BLUETOOTH_MESSAGE_IO_THREAD_FAILED,
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    BLUETOOTH_MESSAGE_STREAM_FD_HUP,
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    BLUETOOTH_MESSAGE_MAX
};

typedef struct bluetooth_msg {
    pa_msgobject parent;
    pa_card *card;
} bluetooth_msg;
PA_DEFINE_PRIVATE_CLASS(bluetooth_msg, pa_msgobject);
#define BLUETOOTH_MSG(o) (bluetooth_msg_cast(o))

typedef struct sbc_info {
    sbc_t sbc;                           /* Codec data */
    bool sbc_initialized;                /* Keep track if the encoder is initialized */
    size_t codesize, frame_length;       /* SBC Codesize, frame_length. We simply cache those values here */
    uint16_t seq_num;                    /* Cumulative packet sequence */
    uint8_t min_bitpool;
    uint8_t max_bitpool;

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

struct userdata {
    pa_module *module;
    pa_core *core;

    pa_hook_slot *device_connection_changed_slot;
    pa_hook_slot *transport_state_changed_slot;
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    pa_hook_slot *transport_speaker_gain_changed_slot;
    pa_hook_slot *transport_microphone_gain_changed_slot;
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    pa_bluetooth_discovery *discovery;
    pa_bluetooth_device *device;
    pa_bluetooth_transport *transport;
    bool transport_acquired;

    pa_card *card;
    pa_sink *sink;
    pa_source *source;
    pa_bluetooth_profile_t profile;
    char *output_port_name;
    char *input_port_name;

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

    int stream_fd;
    int stream_write_type;
    size_t read_link_mtu;
    size_t write_link_mtu;
    size_t read_block_size;
    size_t write_block_size;
    uint64_t read_index;
    uint64_t write_index;
    pa_usec_t started_at;
    pa_smoother *read_smoother;
    pa_memchunk write_memchunk;
    pa_sample_spec sample_spec;
    struct sbc_info sbc_info;
};

typedef enum pa_bluetooth_form_factor {
    PA_BLUETOOTH_FORM_FACTOR_UNKNOWN,
    PA_BLUETOOTH_FORM_FACTOR_HEADSET,
    PA_BLUETOOTH_FORM_FACTOR_HANDSFREE,
    PA_BLUETOOTH_FORM_FACTOR_MICROPHONE,
    PA_BLUETOOTH_FORM_FACTOR_SPEAKER,
    PA_BLUETOOTH_FORM_FACTOR_HEADPHONE,
    PA_BLUETOOTH_FORM_FACTOR_PORTABLE,
    PA_BLUETOOTH_FORM_FACTOR_CAR,
    PA_BLUETOOTH_FORM_FACTOR_HIFI,
    PA_BLUETOOTH_FORM_FACTOR_PHONE,
} pa_bluetooth_form_factor_t;

/* Run from main thread */
static pa_bluetooth_form_factor_t form_factor_from_class(uint32_t class_of_device) {
    unsigned major, minor;
    pa_bluetooth_form_factor_t r;

    static const pa_bluetooth_form_factor_t table[] = {
        [1] = PA_BLUETOOTH_FORM_FACTOR_HEADSET,
        [2] = PA_BLUETOOTH_FORM_FACTOR_HANDSFREE,
        [4] = PA_BLUETOOTH_FORM_FACTOR_MICROPHONE,
        [5] = PA_BLUETOOTH_FORM_FACTOR_SPEAKER,
        [6] = PA_BLUETOOTH_FORM_FACTOR_HEADPHONE,
        [7] = PA_BLUETOOTH_FORM_FACTOR_PORTABLE,
        [8] = PA_BLUETOOTH_FORM_FACTOR_CAR,
        [10] = PA_BLUETOOTH_FORM_FACTOR_HIFI
    };

    /*
     * See Bluetooth Assigned Numbers:
     * https://www.bluetooth.org/Technical/AssignedNumbers/baseband.htm
     */
    major = (class_of_device >> 8) & 0x1F;
    minor = (class_of_device >> 2) & 0x3F;

    switch (major) {
        case 2:
            return PA_BLUETOOTH_FORM_FACTOR_PHONE;
        case 4:
            break;
        default:
            pa_log_debug("Unknown Bluetooth major device class %u", major);
            return PA_BLUETOOTH_FORM_FACTOR_UNKNOWN;
    }

    r = minor < PA_ELEMENTSOF(table) ? table[minor] : PA_BLUETOOTH_FORM_FACTOR_UNKNOWN;

    if (!r)
        pa_log_debug("Unknown Bluetooth minor device class %u", minor);

    return r;
}

/* Run from main thread */
static const char *form_factor_to_string(pa_bluetooth_form_factor_t ff) {
    switch (ff) {
        case PA_BLUETOOTH_FORM_FACTOR_UNKNOWN:
            return "unknown";
        case PA_BLUETOOTH_FORM_FACTOR_HEADSET:
            return "headset";
        case PA_BLUETOOTH_FORM_FACTOR_HANDSFREE:
            return "hands-free";
        case PA_BLUETOOTH_FORM_FACTOR_MICROPHONE:
            return "microphone";
        case PA_BLUETOOTH_FORM_FACTOR_SPEAKER:
            return "speaker";
        case PA_BLUETOOTH_FORM_FACTOR_HEADPHONE:
            return "headphone";
        case PA_BLUETOOTH_FORM_FACTOR_PORTABLE:
            return "portable";
        case PA_BLUETOOTH_FORM_FACTOR_CAR:
            return "car";
        case PA_BLUETOOTH_FORM_FACTOR_HIFI:
            return "hifi";
        case PA_BLUETOOTH_FORM_FACTOR_PHONE:
            return "phone";
    }

    pa_assert_not_reached();
}

/* Run from main thread */
static void connect_ports(struct userdata *u, void *new_data, pa_direction_t direction) {
    pa_device_port *port;

    if (direction == PA_DIRECTION_OUTPUT) {
        pa_sink_new_data *sink_new_data = new_data;

        pa_assert_se(port = pa_hashmap_get(u->card->ports, u->output_port_name));
        pa_assert_se(pa_hashmap_put(sink_new_data->ports, port->name, port) >= 0);
        pa_device_port_ref(port);
    } else {
        pa_source_new_data *source_new_data = new_data;

        pa_assert_se(port = pa_hashmap_get(u->card->ports, u->input_port_name));
        pa_assert_se(pa_hashmap_put(source_new_data->ports, port->name, port) >= 0);
        pa_device_port_ref(port);
    }
}

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/* Run from IO thread */
static int sco_process_render(struct userdata *u) {
    ssize_t l;
    pa_memchunk memchunk;

    pa_assert(u);
    pa_assert(u->profile == PA_BLUETOOTH_PROFILE_HEADSET_HEAD_UNIT ||
                u->profile == PA_BLUETOOTH_PROFILE_HEADSET_AUDIO_GATEWAY);
    pa_assert(u->sink);

    pa_sink_render_full(u->sink, u->write_block_size, &memchunk);

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

    for (;;) {
        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(&memchunk);
        l = pa_write(u->stream_fd, p, memchunk.length, &u->stream_write_type);
        pa_memblock_release(memchunk.memblock);

        pa_assert(l != 0);

        if (l > 0)
            break;

        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 */
            return 0;

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

    pa_assert((size_t) l <= memchunk.length);

    if ((size_t) l != 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) memchunk.length);
        return -1;
    }

    u->write_index += (uint64_t) memchunk.length;
    pa_memblock_unref(memchunk.memblock);

    return 1;
}

/* Run from IO thread */
static int sco_process_push(struct userdata *u) {
    ssize_t l;
    pa_memchunk memchunk;
    struct cmsghdr *cm;
    struct msghdr m;
    bool found_tstamp = false;
    pa_usec_t tstamp = 0;

    pa_assert(u);
    pa_assert(u->profile == PA_BLUETOOTH_PROFILE_HEADSET_HEAD_UNIT ||
                u->profile == PA_BLUETOOTH_PROFILE_HEADSET_AUDIO_GATEWAY);
    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 (;;) {
        void *p;
        uint8_t aux[1024];
        struct iovec iov;

        pa_zero(m);
        pa_zero(aux);
        pa_zero(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)
            break;

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

        pa_memblock_unref(memchunk.memblock);

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

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

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

    /* In some rare occasions, we might receive packets of a very strange
     * size. This could potentially be possible if the SCO packet was
     * received partially over-the-air, or more probably due to hardware
     * issues in our Bluetooth adapter. In these cases, in order to avoid
     * an assertion failure due to unaligned data, just discard the whole
     * packet */
    if (!pa_frame_aligned(l, &u->sample_spec)) {
        pa_log_warn("SCO packet received of unaligned size: %zu", l);
        pa_memblock_unref(memchunk.memblock);
        return -1;
    }

    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);
    pa_memblock_unref(memchunk.memblock);

    return l;
}

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/* 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->sbc_info.buffer_size >= min_buffer_size)
        return;

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

/* Run from IO thread */
static int a2dp_process_render(struct userdata *u) {
    struct sbc_info *sbc_info;
    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 == PA_BLUETOOTH_PROFILE_A2DP_SINK);
    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);

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

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

        encoded = sbc_encode(&sbc_info->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_assert_fp((size_t) encoded <= to_encode);
        pa_assert_fp((size_t) encoded == sbc_info->codesize);

        pa_assert_fp((size_t) written <= to_write);
        pa_assert_fp((size_t) written == sbc_info->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(&sbc_info->sbc)));
    } PA_ONCE_END;

    /* write it to the fifo */
    memset(sbc_info->buffer, 0, sizeof(*header) + sizeof(*payload));
    header->v = 2;
    header->pt = 1;
    header->sequence_number = htons(sbc_info->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*) sbc_info->buffer;

    for (;;) {
        ssize_t l;

        l = pa_write(u->stream_fd, sbc_info->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;
}

/* Run from IO thread */
static int a2dp_process_push(struct userdata *u) {
    int ret = 0;
    pa_memchunk memchunk;

    pa_assert(u);
    pa_assert(u->profile == PA_BLUETOOTH_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 (;;) {
        bool found_tstamp = false;
        pa_usec_t tstamp;
        struct sbc_info *sbc_info;
        struct rtp_header *header;
        struct rtp_payload *payload;
        const void *p;
        void *d;
        ssize_t l;
        size_t to_write, to_decode;
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        size_t total_written = 0;
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        a2dp_prepare_buffer(u);

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

        l = pa_read(u->stream_fd, sbc_info->buffer, sbc_info->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 <= sbc_info->buffer_size);

        /* 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();
        }

        p = (uint8_t*) sbc_info->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(&sbc_info->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);
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                return 0;
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            }

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            total_written += written;

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

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

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

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

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

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        u->read_index += (uint64_t) total_written;
        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);

639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770
        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;
}

/* Run from I/O thread */
static void a2dp_set_bitpool(struct userdata *u, uint8_t bitpool) {
    struct sbc_info *sbc_info;

    pa_assert(u);

    sbc_info = &u->sbc_info;

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

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

    sbc_info->sbc.bitpool = bitpool;

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

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

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

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

/* Run from I/O thread */
static void a2dp_reduce_bitpool(struct userdata *u) {
    struct sbc_info *sbc_info;
    uint8_t bitpool;

    pa_assert(u);

    sbc_info = &u->sbc_info;

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

    bitpool = sbc_info->sbc.bitpool - BITPOOL_DEC_STEP;

    if (bitpool < BITPOOL_DEC_LIMIT)
        bitpool = BITPOOL_DEC_LIMIT;

    a2dp_set_bitpool(u, bitpool);
}

static void teardown_stream(struct userdata *u) {
    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;
    }

    if (u->write_memchunk.memblock) {
        pa_memblock_unref(u->write_memchunk.memblock);
        pa_memchunk_reset(&u->write_memchunk);
    }

    pa_log_debug("Audio stream torn down");
}

static int transport_acquire(struct userdata *u, bool optional) {
    pa_assert(u->transport);

    if (u->transport_acquired)
        return 0;

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

    u->stream_fd = u->transport->acquire(u->transport, optional, &u->read_link_mtu, &u->write_link_mtu);
    if (u->stream_fd < 0)
        return -1;

    u->transport_acquired = true;
    pa_log_info("Transport %s acquired: fd %d", u->transport->path, u->stream_fd);

    return 0;
}

static void transport_release(struct userdata *u) {
    pa_assert(u->transport);

    /* Ignore if already released */
    if (!u->transport_acquired)
        return;

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

    u->transport->release(u->transport);

    u->transport_acquired = false;

    teardown_stream(u);
}

/* Run from I/O thread */
static void transport_config_mtu(struct userdata *u) {
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    if (u->profile == PA_BLUETOOTH_PROFILE_HEADSET_HEAD_UNIT || u->profile == PA_BLUETOOTH_PROFILE_HEADSET_AUDIO_GATEWAY) {
        u->read_block_size = u->read_link_mtu;
        u->write_block_size = u->write_link_mtu;
    } else {
        u->read_block_size =
            (u->read_link_mtu - sizeof(struct rtp_header) - sizeof(struct rtp_payload))
            / u->sbc_info.frame_length * u->sbc_info.codesize;
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779 780 781 782
        u->write_block_size =
            (u->write_link_mtu - sizeof(struct rtp_header) - sizeof(struct rtp_payload))
            / u->sbc_info.frame_length * u->sbc_info.codesize;
    }
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    if (u->sink) {
        pa_sink_set_max_request_within_thread(u->sink, u->write_block_size);
        pa_sink_set_fixed_latency_within_thread(u->sink,
787 788
                                                (u->profile == PA_BLUETOOTH_PROFILE_A2DP_SINK ?
                                                 FIXED_LATENCY_PLAYBACK_A2DP : FIXED_LATENCY_PLAYBACK_SCO) +
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                                                pa_bytes_to_usec(u->write_block_size, &u->sample_spec));
    }

    if (u->source)
        pa_source_set_fixed_latency_within_thread(u->source,
794 795
                                                  (u->profile == PA_BLUETOOTH_PROFILE_A2DP_SOURCE ?
                                                   FIXED_LATENCY_RECORD_A2DP : FIXED_LATENCY_RECORD_SCO) +
796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907
                                                  pa_bytes_to_usec(u->read_block_size, &u->sample_spec));
}

/* Run from I/O thread */
static void setup_stream(struct userdata *u) {
    struct pollfd *pollfd;
    int one;

    pa_log_info("Transport %s resuming", u->transport->path);

    transport_config_mtu(u);

    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 == PA_BLUETOOTH_PROFILE_A2DP_SINK)
        a2dp_set_bitpool(u, u->sbc_info.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, 2*PA_USEC_PER_SEC, true, true, 10, pa_rtclock_now(), true);
}

/* 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;
    bool 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:
                    /* Ignore if transition is PA_SOURCE_INIT->PA_SOURCE_SUSPENDED */
                    if (!PA_SOURCE_IS_OPENED(u->source->thread_info.state))
                        break;

                    /* Stop the device if the sink is suspended as well */
                    if (!u->sink || u->sink->state == PA_SINK_SUSPENDED)
                        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 || !PA_SINK_IS_OPENED(u->sink->thread_info.state)) {
                        if (transport_acquire(u, false) < 0)
                            failed = true;
                        else
                            setup_stream(u);
                    }

                    /* 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;
            }

            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) = FIXED_LATENCY_RECORD_A2DP + wi > ri ? FIXED_LATENCY_RECORD_A2DP + wi - ri : 0;
            } else
                *((pa_usec_t*) data) = 0;

            return 0;
        }

    }

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

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

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/* Run from main thread */
static void source_set_volume_cb(pa_source *s) {
    uint16_t gain;
    pa_volume_t volume;
    struct userdata *u;

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

    u = s->userdata;

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

    if (u->transport->set_microphone_gain == NULL)
      return;

    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);

    u->transport->set_microphone_gain(u->transport, gain);
}

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

    pa_assert(u->transport);

    pa_source_new_data_init(&data);
    data.module = u->module;
    data.card = u->card;
    data.driver = __FILE__;
    data.name = pa_sprintf_malloc("bluez_source.%s", u->device->address);
    data.namereg_fail = false;
    pa_proplist_sets(data.proplist, "bluetooth.protocol", pa_bluetooth_profile_to_string(u->profile));
    pa_source_new_data_set_sample_spec(&data, &u->sample_spec);
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    if (u->profile == PA_BLUETOOTH_PROFILE_HEADSET_HEAD_UNIT)
        pa_proplist_sets(data.proplist, PA_PROP_DEVICE_INTENDED_ROLES, "phone");
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    connect_ports(u, &data, PA_DIRECTION_INPUT);

    if (!u->transport_acquired)
        switch (u->profile) {
            case PA_BLUETOOTH_PROFILE_A2DP_SOURCE:
964
            case PA_BLUETOOTH_PROFILE_HEADSET_AUDIO_GATEWAY:
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                data.suspend_cause = PA_SUSPEND_USER;
                break;
            case PA_BLUETOOTH_PROFILE_A2DP_SINK:
968
            case PA_BLUETOOTH_PROFILE_HEADSET_HEAD_UNIT:
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            case PA_BLUETOOTH_PROFILE_OFF:
                pa_assert_not_reached();
                break;
        }

    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;

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    if (u->profile == PA_BLUETOOTH_PROFILE_HEADSET_HEAD_UNIT) {
        pa_source_set_set_volume_callback(u->source, source_set_volume_cb);
        u->source->n_volume_steps = 16;
    }
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    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;
    bool 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:
                    /* Ignore if transition is PA_SINK_INIT->PA_SINK_SUSPENDED */
                    if (!PA_SINK_IS_OPENED(u->sink->thread_info.state))
                        break;

                    /* 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 */
                        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 || !PA_SOURCE_IS_OPENED(u->source->thread_info.state)) {
                        if (transport_acquire(u, false) < 0)
                            failed = true;
                        else
                            setup_stream(u);
                    }

                    break;

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

            break;

        case PA_SINK_MESSAGE_GET_LATENCY: {
            pa_usec_t wi, ri;

            if (u->read_smoother) {
                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);
            } else {
                ri = pa_rtclock_now() - u->started_at;
                wi = pa_bytes_to_usec(u->write_index, &u->sample_spec);
            }

            *((pa_usec_t*) data) = FIXED_LATENCY_PLAYBACK_A2DP + wi > ri ? FIXED_LATENCY_PLAYBACK_A2DP + wi - ri : 0;

            return 0;
        }
    }

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

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

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/* Run from main thread */
static void sink_set_volume_cb(pa_sink *s) {
    uint16_t gain;
    pa_volume_t volume;
    struct userdata *u;

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

    u = s->userdata;

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

    if (u->transport->set_speaker_gain == NULL)
      return;

    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);

    u->transport->set_speaker_gain(u->transport, gain);
}

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

    pa_assert(u->transport);

    pa_sink_new_data_init(&data);
    data.module = u->module;
    data.card = u->card;
    data.driver = __FILE__;
    data.name = pa_sprintf_malloc("bluez_sink.%s", u->device->address);
    data.namereg_fail = false;
    pa_proplist_sets(data.proplist, "bluetooth.protocol", pa_bluetooth_profile_to_string(u->profile));
    pa_sink_new_data_set_sample_spec(&data, &u->sample_spec);
1113 1114
    if (u->profile == PA_BLUETOOTH_PROFILE_HEADSET_HEAD_UNIT)
        pa_proplist_sets(data.proplist, PA_PROP_DEVICE_INTENDED_ROLES, "phone");
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    connect_ports(u, &data, PA_DIRECTION_OUTPUT);

    if (!u->transport_acquired)
        switch (u->profile) {
1120 1121 1122
            case PA_BLUETOOTH_PROFILE_HEADSET_AUDIO_GATEWAY:
                data.suspend_cause = PA_SUSPEND_USER;
                break;
1123 1124 1125
            case PA_BLUETOOTH_PROFILE_A2DP_SINK:
                /* Profile switch should have failed */
            case PA_BLUETOOTH_PROFILE_A2DP_SOURCE:
1126
            case PA_BLUETOOTH_PROFILE_HEADSET_HEAD_UNIT:
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            case PA_BLUETOOTH_PROFILE_OFF:
                pa_assert_not_reached();
                break;
        }

    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;

1142 1143 1144 1145
    if (u->profile == PA_BLUETOOTH_PROFILE_HEADSET_HEAD_UNIT) {
        pa_sink_set_set_volume_callback(u->sink, sink_set_volume_cb);
        u->sink->n_volume_steps = 16;
    }
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    return 0;
}

/* Run from main thread */
static void transport_config(struct userdata *u) {
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    if (u->profile == PA_BLUETOOTH_PROFILE_HEADSET_HEAD_UNIT || u->profile == PA_BLUETOOTH_PROFILE_HEADSET_AUDIO_GATEWAY) {
        u->sample_spec.format = PA_SAMPLE_S16LE;
        u->sample_spec.channels = 1;
        u->sample_spec.rate = 8000;
    } else {
        sbc_info_t *sbc_info = &u->sbc_info;
        a2dp_sbc_t *config;
1158

1159
        pa_assert(u->transport);
1160

1161 1162
        u->sample_spec.format = PA_SAMPLE_S16LE;
        config = (a2dp_sbc_t *) u->transport->config;
1163

1164 1165 1166 1167 1168
        if (sbc_info->sbc_initialized)
            sbc_reinit(&sbc_info->sbc, 0);
        else
            sbc_init(&sbc_info->sbc, 0);
        sbc_info->sbc_initialized = true;
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        switch (config->frequency) {
            case SBC_SAMPLING_FREQ_16000:
                sbc_info->sbc.frequency = SBC_FREQ_16000;
                u->sample_spec.rate = 16000U;
                break;
            case SBC_SAMPLING_FREQ_32000:
                sbc_info->sbc.frequency = SBC_FREQ_32000;
                u->sample_spec.rate = 32000U;
                break;
            case SBC_SAMPLING_FREQ_44100:
                sbc_info->sbc.frequency = SBC_FREQ_44100;
                u->sample_spec.rate = 44100U;
                break;
            case SBC_SAMPLING_FREQ_48000:
                sbc_info->sbc.frequency = SBC_FREQ_48000;
                u->sample_spec.rate = 48000U;
                break;
            default:
                pa_assert_not_reached();
        }
1190

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        switch (config->channel_mode) {
            case SBC_CHANNEL_MODE_MONO:
                sbc_info->sbc.mode = SBC_MODE_MONO;
                u->sample_spec.channels = 1;
                break;
            case SBC_CHANNEL_MODE_DUAL_CHANNEL:
                sbc_info->sbc.mode = SBC_MODE_DUAL_CHANNEL;
                u->sample_spec.channels = 2;
                break;
            case SBC_CHANNEL_MODE_STEREO:
                sbc_info->sbc.mode = SBC_MODE_STEREO;
                u->sample_spec.channels = 2;
                break;
            case SBC_CHANNEL_MODE_JOINT_STEREO:
                sbc_info->sbc.mode = SBC_MODE_JOINT_STEREO;
                u->sample_spec.channels = 2;
                break;
            default:
                pa_assert_not_reached();
        }
1211

1212 1213 1214 1215 1216 1217 1218 1219 1220 1221
        switch (config->allocation_method) {
            case SBC_ALLOCATION_SNR:
                sbc_info->sbc.allocation = SBC_AM_SNR;
                break;
            case SBC_ALLOCATION_LOUDNESS:
                sbc_info->sbc.allocation = SBC_AM_LOUDNESS;
                break;
            default:
                pa_assert_not_reached();
        }
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1223 1224 1225 1226 1227 1228 1229 1230 1231 1232
        switch (config->subbands) {
            case SBC_SUBBANDS_4:
                sbc_info->sbc.subbands = SBC_SB_4;
                break;
            case SBC_SUBBANDS_8:
                sbc_info->sbc.subbands = SBC_SB_8;
                break;
            default:
                pa_assert_not_reached();
        }
1233

1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249
        switch (config->block_length) {
            case SBC_BLOCK_LENGTH_4:
                sbc_info->sbc.blocks = SBC_BLK_4;
                break;
            case SBC_BLOCK_LENGTH_8:
                sbc_info->sbc.blocks = SBC_BLK_8;
                break;
            case SBC_BLOCK_LENGTH_12:
                sbc_info->sbc.blocks = SBC_BLK_12;
                break;
            case SBC_BLOCK_LENGTH_16:
                sbc_info->sbc.blocks = SBC_BLK_16;
                break;
            default:
                pa_assert_not_reached();
        }
1250

1251 1252
        sbc_info->min_bitpool = config->min_bitpool;
        sbc_info->max_bitpool = config->max_bitpool;
1253

1254 1255 1256 1257
        /* Set minimum bitpool for source to get the maximum possible block_size */
        sbc_info->sbc.bitpool = u->profile == PA_BLUETOOTH_PROFILE_A2DP_SINK ? sbc_info->max_bitpool : sbc_info->min_bitpool;
        sbc_info->codesize = sbc_get_codesize(&sbc_info->sbc);
        sbc_info->frame_length = sbc_get_frame_length(&sbc_info->sbc);
1258

1259 1260 1261
        pa_log_info("SBC parameters: allocation=%u, subbands=%u, blocks=%u, bitpool=%u",
                    sbc_info->sbc.allocation, sbc_info->sbc.subbands, sbc_info->sbc.blocks, sbc_info->sbc.bitpool);
    }
1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280
}

/* Run from main thread */
static int setup_transport(struct userdata *u) {
    pa_bluetooth_transport *t;

    pa_assert(u);
    pa_assert(!u->transport);
    pa_assert(u->profile != PA_BLUETOOTH_PROFILE_OFF);

    /* check if profile has a transport */
    t = u->device->transports[u->profile];
    if (!t || t->state <= PA_BLUETOOTH_TRANSPORT_STATE_DISCONNECTED) {
        pa_log_warn("Profile has no transport");
        return -1;
    }

    u->transport = t;

1281
    if (u->profile == PA_BLUETOOTH_PROFILE_A2DP_SOURCE || u->profile == PA_BLUETOOTH_PROFILE_HEADSET_AUDIO_GATEWAY)
1282 1283 1284 1285 1286 1287 1288 1289 1290
        transport_acquire(u, true); /* In case of error, the sink/sources will be created suspended */
    else if (transport_acquire(u, false) < 0)
        return -1; /* We need to fail here until the interactions with module-suspend-on-idle and alike get improved */

    transport_config(u);

    return 0;
}

1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303
/* Run from main thread */
static pa_direction_t get_profile_direction(pa_bluetooth_profile_t p) {
    static const pa_direction_t profile_direction[] = {
        [PA_BLUETOOTH_PROFILE_A2DP_SINK] = PA_DIRECTION_OUTPUT,
        [PA_BLUETOOTH_PROFILE_A2DP_SOURCE] = PA_DIRECTION_INPUT,
        [PA_BLUETOOTH_PROFILE_HEADSET_HEAD_UNIT] = PA_DIRECTION_INPUT | PA_DIRECTION_OUTPUT,
        [PA_BLUETOOTH_PROFILE_HEADSET_AUDIO_GATEWAY] = PA_DIRECTION_INPUT | PA_DIRECTION_OUTPUT,
        [PA_BLUETOOTH_PROFILE_OFF] = 0
    };

    return profile_direction[p];
}

1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314
/* Run from main thread */
static int init_profile(struct userdata *u) {
    int r = 0;
    pa_assert(u);
    pa_assert(u->profile != PA_BLUETOOTH_PROFILE_OFF);

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

    pa_assert(u->transport);

1315
    if (get_profile_direction (u->profile) & PA_DIRECTION_OUTPUT)
1316 1317 1318
        if (add_sink(u) < 0)
            r = -1;

1319
    if (get_profile_direction (u->profile) & PA_DIRECTION_INPUT)
1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353
        if (add_source(u) < 0)
            r = -1;

    return r;
}

/* I/O thread function */
static void thread_func(void *userdata) {
    struct userdata *u = userdata;
    unsigned do_write = 0;
    unsigned pending_read_bytes = 0;
    bool 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);

    /* Setup the stream only if the transport was already acquired */
    if (u->transport_acquired)
        setup_stream(u);

    for (;;) {
        struct pollfd *pollfd;
        int ret;
        bool disable_timer = true;

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

1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371
        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 " :"");

            if (pollfd->revents & POLLHUP) {
                pollfd = NULL;
                teardown_stream(u);
                do_write = 0;
                pending_read_bytes = 0;
                writable = false;
                pa_asyncmsgq_post(pa_thread_mq_get()->outq, PA_MSGOBJECT(u->msg), BLUETOOTH_MESSAGE_STREAM_FD_HUP, NULL, 0, NULL, NULL);
            } else
                goto fail;
        }

1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382
        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;

1383 1384 1385 1386
                if (u->profile == PA_BLUETOOTH_PROFILE_A2DP_SOURCE)
                    n_read = a2dp_process_push(u);
                else
                    n_read = sco_process_push(u);
1387 1388

                if (n_read < 0)
1389
                    goto fail;
1390

1391 1392 1393 1394 1395 1396
                if (n_read > 0) {
                    /* 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;
                }
1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456
            }
        }

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

            if (PA_UNLIKELY(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 == PA_BLUETOOTH_PROFILE_A2DP_SINK)
                                    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();

1457 1458 1459 1460 1461 1462 1463
                    if (u->profile == PA_BLUETOOTH_PROFILE_A2DP_SINK) {
                        if ((n_written = a2dp_process_render(u)) < 0)
                            goto fail;
                    } else {
                        if ((n_written = sco_process_render(u)) < 0)
                            goto fail;
                    }
1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500

                    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));

1501
        if ((ret = pa_rtpoll_run(u->rtpoll)) < 0) {
1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787
            pa_log_debug("pa_rtpoll_run failed with: %d", ret);
            goto fail;
        }
        if (ret == 0) {
            pa_log_debug("IO thread shutdown requested, stopping cleanly");
            transport_release(u);
            goto finish;
        }
    }

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");
}

/* 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 (!(u->thread = pa_thread_new("bluetooth", thread_func, u))) {
        pa_log_error("Failed to create IO thread");
        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;
}

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

    if (u->sink)
        pa_sink_unlink(u->sink);

    if (u->source)
        pa_source_unlink(u->source);

    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->rtpoll) {
        pa_thread_mq_done(&u->thread_mq);
        pa_rtpoll_free(u->rtpoll);
        u->rtpoll = NULL;
    }

    if (u->transport) {
        transport_release(u);
        u->transport = NULL;
    }

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

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

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

/* Run from main thread */
static char *cleanup_name(const char *name) {
    char *t, *s, *d;
    bool space = false;

    pa_assert(name);

    while ((*name >= 1 && *name <= 32) || *name >= 127)
        name++;

    t = pa_xstrdup(name);

    for (s = d = t; *s; s++) {

        if (*s <= 32 || *s >= 127 || *s == '_') {
            space = true;
            continue;
        }

        if (space) {
            *(d++) = ' ';
            space = false;
        }

        *(d++) = *s;
    }

    *d = 0;

    return t;
}

/* Run from main thread */
static pa_available_t get_port_availability(struct userdata *u, pa_direction_t direction) {
    pa_available_t result = PA_AVAILABLE_NO;
    unsigned i;

    pa_assert(u);
    pa_assert(u->device);

    for (i = 0; i < PA_BLUETOOTH_PROFILE_COUNT; i++) {
        pa_bluetooth_transport *transport;

        if (!(get_profile_direction(i) & direction))
            continue;

        if (!(transport = u->device->transports[i]))
            continue;

        switch(transport->state) {
            case PA_BLUETOOTH_TRANSPORT_STATE_DISCONNECTED:
                continue;

            case PA_BLUETOOTH_TRANSPORT_STATE_IDLE:
                if (result == PA_AVAILABLE_NO)
                    result = PA_AVAILABLE_UNKNOWN;

                break;

            case PA_BLUETOOTH_TRANSPORT_STATE_PLAYING:
                return PA_AVAILABLE_YES;
        }
    }

    return result;
}

/* Run from main thread */
static pa_available_t transport_state_to_availability(pa_bluetooth_transport_state_t state) {
    switch (state) {
        case PA_BLUETOOTH_TRANSPORT_STATE_DISCONNECTED:
            return PA_AVAILABLE_NO;
        case PA_BLUETOOTH_TRANSPORT_STATE_PLAYING:
            return PA_AVAILABLE_YES;
        default:
            return PA_AVAILABLE_UNKNOWN;
    }
}

/* Run from main thread */
static void create_card_ports(struct userdata *u, pa_hashmap *ports) {
    pa_device_port *port;
    pa_device_port_new_data port_data;
    const char *name_prefix, *input_description, *output_description;

    pa_assert(u);
    pa_assert(ports);
    pa_assert(u->device);

    name_prefix = "unknown";
    input_description = _("Bluetooth Input");
    output_description = _("Bluetooth Output");

    switch (form_factor_from_class(u->device->class_of_device)) {
        case PA_BLUETOOTH_FORM_FACTOR_HEADSET:
            name_prefix = "headset";
            input_description = output_description = _("Headset");
            break;

        case PA_BLUETOOTH_FORM_FACTOR_HANDSFREE:
            name_prefix = "handsfree";
            input_description = output_description = _("Handsfree");
            break;

        case PA_BLUETOOTH_FORM_FACTOR_MICROPHONE:
            name_prefix = "microphone";
            input_description = _("Microphone");
            output_description = _("Bluetooth Output");
            break;

        case PA_BLUETOOTH_FORM_FACTOR_SPEAKER:
            name_prefix = "speaker";
            input_description = _("Bluetooth Input");
            output_description = _("Speaker");
            break;

        case PA_BLUETOOTH_FORM_FACTOR_HEADPHONE:
            name_prefix = "headphone";
            input_description = _("Bluetooth Input");
            output_description = _("Headphone");
            break;

        case PA_BLUETOOTH_FORM_FACTOR_PORTABLE:
            name_prefix = "portable";
            input_description = output_description = _("Portable");
            break;

        case PA_BLUETOOTH_FORM_FACTOR_CAR:
            name_prefix = "car";
            input_description = output_description = _("Car");
            break;

        case PA_BLUETOOTH_FORM_FACTOR_HIFI:
            name_prefix = "hifi";
            input_description = output_description = _("HiFi");
            break;

        case PA_BLUETOOTH_FORM_FACTOR_PHONE:
            name_prefix = "phone";
            input_description = output_description = _("Phone");
            break;

        case PA_BLUETOOTH_FORM_FACTOR_UNKNOWN:
            name_prefix = "unknown";
            input_description = _("Bluetooth Input");
            output_description = _("Bluetooth Output");
            break;
    }

    u->output_port_name = pa_sprintf_malloc("%s-output", name_prefix);
    pa_device_port_new_data_init(&port_data);
    pa_device_port_new_data_set_name(&port_data, u->output_port_name);
    pa_device_port_new_data_set_description(&port_data, output_description);
    pa_device_port_new_data_set_direction(&port_data, PA_DIRECTION_OUTPUT);
    pa_device_port_new_data_set_available(&port_data, get_port_availability(u, PA_DIRECTION_OUTPUT));
    pa_assert_se(port = pa_device_port_new(u->core, &port_data, 0));
    pa_assert_se(pa_hashmap_put(ports, port->name, port) >= 0);
    pa_device_port_new_data_done(&port_data);

    u->input_port_name = pa_sprintf_malloc("%s-input", name_prefix);
    pa_device_port_new_data_init(&port_data);
    pa_device_port_new_data_set_name(&port_data, u->input_port_name);
    pa_device_port_new_data_set_description(&port_data, input_description);
    pa_device_port_new_data_set_direction(&port_data, PA_DIRECTION_INPUT);
    pa_device_port_new_data_set_available(&port_data, get_port_availability(u, PA_DIRECTION_INPUT));
    pa_assert_se(port = pa_device_port_new(u->core, &port_data, 0));
    pa_assert_se(pa_hashmap_put(ports, port->name, port) >= 0);
    pa_device_port_new_data_done(&port_data);
}

/* Run from main thread */
static pa_card_profile *create_card_profile(struct userdata *u, const char *uuid, pa_hashmap *ports) {
    pa_device_port *input_port, *output_port;
    pa_card_profile *cp = NULL;
    pa_bluetooth_profile_t *p;

    pa_assert(u->input_port_name);
    pa_assert(u->output_port_name);
    pa_assert_se(input_port = pa_hashmap_get(ports, u->input_port_name));
    pa_assert_se(output_port = pa_hashmap_get(ports, u->output_port_name));

    if (pa_streq(uuid, PA_BLUETOOTH_UUID_A2DP_SINK)) {
1788
        cp = pa_card_profile_new("a2dp_sink", _("High Fidelity Playback (A2DP Sink)"), sizeof(pa_bluetooth_profile_t));
1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808
        cp->priority = 10;
        cp->n_sinks = 1;
        cp->n_sources = 0;
        cp->max_sink_channels = 2;
        cp->max_source_channels = 0;
        pa_hashmap_put(output_port->profiles, cp->name, cp);

        p = PA_CARD_PROFILE_DATA(cp);
        *p = PA_BLUETOOTH_PROFILE_A2DP_SINK;
    } else if (pa_streq(uuid, PA_BLUETOOTH_UUID_A2DP_SOURCE)) {
        cp = pa_card_profile_new("a2dp_source", _("High Fidelity Capture (A2DP Source)"), sizeof(pa_bluetooth_profile_t));
        cp->priority = 10;
        cp->n_sinks = 0;
        cp->n_sources = 1;
        cp->max_sink_channels = 0;
        cp->max_source_channels = 2;
        pa_hashmap_put(input_port->profiles, cp->name, cp);

        p = PA_CARD_PROFILE_DATA(cp);
        *p = PA_BLUETOOTH_PROFILE_A2DP_SOURCE;
1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832
    } else if (pa_streq(uuid, PA_BLUETOOTH_UUID_HSP_HS) || pa_streq(uuid, PA_BLUETOOTH_UUID_HFP_HF)) {
        cp = pa_card_profile_new("headset_head_unit", _("Headset Head Unit (HSP/HFP)"), sizeof(pa_bluetooth_profile_t));
        cp->priority = 20;
        cp->n_sinks = 1;
        cp->n_sources = 1;
        cp->max_sink_channels = 1;
        cp->max_source_channels = 1;
        pa_hashmap_put(input_port->profiles, cp->name, cp);
        pa_hashmap_put(output_port->profiles, cp->name, cp);

        p = PA_CARD_PROFILE_DATA(cp);
        *p = PA_BLUETOOTH_PROFILE_HEADSET_HEAD_UNIT;
    } else if (pa_streq(uuid, PA_BLUETOOTH_UUID_HSP_AG) || pa_streq(uuid, PA_BLUETOOTH_UUID_HFP_AG)) {
        cp = pa_card_profile_new("headset_audio_gateway", _("Headset Audio Gateway (HSP/HFP)"), sizeof(pa_bluetooth_profile_t));
        cp->priority = 20;
        cp->n_sinks = 1;
        cp->n_sources = 1;
        cp->max_sink_channels = 1;
        cp->max_source_channels = 1;
        pa_hashmap_put(input_port->profiles, cp->name, cp);
        pa_hashmap_put(output_port->profiles, cp->name, cp);

        p = PA_CARD_PROFILE_DATA(cp);
        *p = PA_BLUETOOTH_PROFILE_HEADSET_AUDIO_GATEWAY;
1833 1834
    }

1835 1836 1837 1838 1839 1840
    if (cp) {
        if (u->device->transports[*p])
            cp->available = transport_state_to_availability(u->device->transports[*p]->state);
        else
            cp->available = PA_AVAILABLE_NO;
    }
1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973

    return cp;
}

/* Run from main thread */
static int set_profile_cb(pa_card *c, pa_card_profile *new_profile) {
    struct userdata *u;
    pa_bluetooth_profile_t *p;

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

    p = PA_CARD_PROFILE_DATA(new_profile);

    if (*p != PA_BLUETOOTH_PROFILE_OFF) {
        const pa_bluetooth_device *d = u->device;

        if (!d->transports[*p] || d->transports[*p]->state <= PA_BLUETOOTH_TRANSPORT_STATE_DISCONNECTED) {
            pa_log_warn("Refused to switch profile to %s: Not connected", new_profile->name);
            return -PA_ERR_IO;
        }
    }

    stop_thread(u);

    u->profile = *p;

    if (u->profile != PA_BLUETOOTH_PROFILE_OFF)
        if (init_profile(u) < 0)
            goto off;

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

    return 0;

off:
    stop_thread(u);

    pa_assert_se(pa_card_set_profile(u->card, pa_hashmap_get(u->card->profiles, "off"), false) >= 0);

    return -PA_ERR_IO;
}

/* Run from main thread */
static int add_card(struct userdata *u) {
    const pa_bluetooth_device *d;
    pa_card_new_data data;
    char *alias;
    pa_bluetooth_form_factor_t ff;
    pa_card_profile *cp;
    pa_bluetooth_profile_t *p;
    const char *uuid;
    void *state;

    pa_assert(u);
    pa_assert(u->device);

    d = u->device;

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

    alias = cleanup_name(d->alias);
    pa_proplist_sets(data.proplist, PA_PROP_DEVICE_DESCRIPTION, alias);
    pa_xfree(alias);

    pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, d->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 = form_factor_from_class(d->class_of_device)) != PA_BLUETOOTH_FORM_FACTOR_UNKNOWN)
        pa_proplist_sets(data.proplist, PA_PROP_DEVICE_FORM_FACTOR, form_factor_to_string(ff));

    pa_proplist_sets(data.proplist, "bluez.path", d->path);
    pa_proplist_setf(data.proplist, "bluez.class", "0x%06x", d->class_of_device);
    pa_proplist_sets(data.proplist, "bluez.alias", d->alias);
    data.name = pa_sprintf_malloc("bluez_card.%s", d->address);
    data.namereg_fail = false;

    create_card_ports(u, data.ports);

    PA_HASHMAP_FOREACH(uuid, d->uuids, state) {
        cp = create_card_profile(u, uuid, data.ports);

        if (!cp)
            continue;

        if (pa_hashmap_get(data.profiles, cp->name)) {
            pa_card_profile_free(cp);
            continue;
        }

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

    pa_assert(!pa_hashmap_isempty(data.profiles));

    cp = pa_card_profile_new("off", _("Off"), sizeof(pa_bluetooth_profile_t));
    cp->available = PA_AVAILABLE_YES;
    p = PA_CARD_PROFILE_DATA(cp);
    *p = PA_BLUETOOTH_PROFILE_OFF;
    pa_hashmap_put(data.profiles, cp->name, cp);

    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 = set_profile_cb;

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

    return 0;
}

/* Run from main thread */
static void handle_transport_state_change(struct userdata *u, struct pa_bluetooth_transport *t) {
    bool acquire = false;
    bool release = false;
    pa_card_profile *cp;
    pa_device_port *port;

    pa_assert(u);
    pa_assert(t);
1974
    pa_assert_se(cp = pa_hashmap_get(u->card->profiles, pa_bluetooth_profile_to_string(t->profile)));
1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056

    pa_card_profile_set_available(cp, transport_state_to_availability(t->state));

    /* Update port availability */
    pa_assert_se(port = pa_hashmap_get(u->card->ports, u->output_port_name));
    pa_device_port_set_available(port, get_port_availability(u, PA_DIRECTION_OUTPUT));
    pa_assert_se(port = pa_hashmap_get(u->card->ports, u->input_port_name));
    pa_device_port_set_available(port, get_port_availability(u, PA_DIRECTION_INPUT));

    /* Acquire or release transport as needed */
    acquire = (t->state == PA_BLUETOOTH_TRANSPORT_STATE_PLAYING && u->profile == t->profile);
    release = (t->state != PA_BLUETOOTH_TRANSPORT_STATE_PLAYING && u->profile == t->profile);

    if (acquire && transport_acquire(u, true) >= 0) {
        if (u->source) {
            pa_log_debug("Resuming source %s because its transport state changed to playing", u->source->name);

            /* We remove the IDLE suspend cause, because otherwise
             * module-loopback doesn't uncork its streams. FIXME: Messing with
             * the IDLE suspend cause here is wrong, the correct way to handle
             * this would probably be to uncork the loopback streams not only
             * when the other end is unsuspended, but also when the other end's
             * suspend cause changes to IDLE only (currently there's no
             * notification mechanism for suspend cause changes, though). */
            pa_source_suspend(u->source, false, PA_SUSPEND_IDLE|PA_SUSPEND_USER);
        }

        if (u->sink) {
            pa_log_debug("Resuming sink %s because its transport state changed to playing", u->sink->name);

            /* FIXME: See the previous comment. */
            pa_sink_suspend(u->sink, false, PA_SUSPEND_IDLE|PA_SUSPEND_USER);
        }
    }

    if (release && u->transport_acquired) {
        /* FIXME: this release is racy, since the audio stream might have
         * been set up again in the meantime (but not processed yet by PA).
         * BlueZ should probably release the transport automatically, and in
         * that case we would just mark the transport as released */

        /* Remote side closed the stream so we consider it PA_SUSPEND_USER */
        if (u->source) {
            pa_log_debug("Suspending source %s because the remote end closed the stream", u->source->name);
            pa_source_suspend(u->source, true, PA_SUSPEND_USER);
        }

        if (u->sink) {
            pa_log_debug("Suspending sink %s because the remote end closed the stream", u->sink->name);
            pa_sink_suspend(u->sink, true, PA_SUSPEND_USER);
        }
    }
}

/* Run from main thread */
static pa_hook_result_t device_connection_changed_cb(pa_bluetooth_discovery *y, const pa_bluetooth_device *d, struct userdata *u) {
    pa_assert(d);
    pa_assert(u);

    if (d != u->device || pa_bluetooth_device_any_transport_connected(d))
        return PA_HOOK_OK;

    pa_log_debug("Unloading module for device %s", d->path);
    pa_module_unload(u->core, u->module, true);

    return PA_HOOK_OK;
}

/* Run from main thread */
static pa_hook_result_t transport_state_changed_cb(pa_bluetooth_discovery *y, pa_bluetooth_transport *t, struct userdata *u) {
    pa_assert(t);
    pa_assert(u);

    if (t == u->transport && t->state <= PA_BLUETOOTH_TRANSPORT_STATE_DISCONNECTED)
        pa_assert_se(pa_card_set_profile(u->card, pa_hashmap_get(u->card->profiles, "off"), false) >= 0);

    if (t->device == u->device)
        handle_transport_state_change(u, t);

    return PA_HOOK_OK;
}

2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104
static pa_hook_result_t transport_speaker_gain_changed_cb(pa_bluetooth_discovery *y, pa_bluetooth_transport *t, struct userdata *u) {
    pa_volume_t volume;
    pa_cvolume v;
    uint16_t gain;

    pa_assert(t);
    pa_assert(u);

    if (t != u->transport)
      return PA_HOOK_OK;

    gain = t->speaker_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(&v, u->sample_spec.channels, volume);
    pa_sink_volume_changed(u->sink, &v);

    return PA_HOOK_OK;
}

static pa_hook_result_t transport_microphone_gain_changed_cb(pa_bluetooth_discovery *y, pa_bluetooth_transport *t, struct userdata *u) {
    pa_volume_t volume;
    pa_cvolume v;
    uint16_t gain;

    pa_assert(t);
    pa_assert(u);

    if (t != u->transport)
      return PA_HOOK_OK;

    gain = t->microphone_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(&v, u->sample_spec.channels, volume);
    pa_source_volume_changed(u->source, &v);

    return PA_HOOK_OK;
}

2105 2106
/* Run from main thread context */
static int device_process_msg(pa_msgobject *obj, int code, void *data, int64_t offset, pa_memchunk *chunk) {
2107 2108
    struct bluetooth_msg *m = BLUETOOTH_MSG(obj);
    struct userdata *u = m->card->userdata;
2109 2110 2111

    switch (code) {
        case BLUETOOTH_MESSAGE_IO_THREAD_FAILED:
2112
            if (m->card->module->unload_requested)
2113 2114 2115
                break;

            pa_log_debug("Switching the profile to off due to IO thread failure.");
2116 2117 2118 2119
            pa_assert_se(pa_card_set_profile(m->card, pa_hashmap_get(m->card->profiles, "off"), false) >= 0);
            break;
        case BLUETOOTH_MESSAGE_STREAM_FD_HUP:
            pa_bluetooth_transport_set_state(u->transport, PA_BLUETOOTH_TRANSPORT_STATE_IDLE);
2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168
            break;
    }

    return 0;
}

int pa__init(pa_module* m) {
    struct userdata *u;
    const char *path;
    pa_modargs *ma;

    pa_assert(m);

    m->userdata = u = pa_xnew0(struct userdata, 1);
    u->module = m;
    u->core = m->core;

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

    if (!(path = pa_modargs_get_value(ma, "path", NULL))) {
        pa_log_error("Failed to get device path from module arguments");
        goto fail;
    }

    if ((u->discovery = pa_shared_get(u->core, "bluetooth-discovery")))
        pa_bluetooth_discovery_ref(u->discovery);
    else {
        pa_log_error("module-bluez5-discover doesn't seem to be loaded, refusing to load module-bluez5-device");
        goto fail;
    }

    if (!(u->device = pa_bluetooth_discovery_get_device_by_path(u->discovery, path))) {
        pa_log_error("%s is unknown", path);
        goto fail;
    }

    pa_modargs_free(ma);

    u->device_connection_changed_slot =
        pa_hook_connect(pa_bluetooth_discovery_hook(u->discovery, PA_BLUETOOTH_HOOK_DEVICE_CONNECTION_CHANGED),
                        PA_HOOK_NORMAL, (pa_hook_cb_t) device_connection_changed_cb, u);

    u->transport_state_changed_slot =
        pa_hook_connect(pa_bluetooth_discovery_hook(u->discovery, PA_BLUETOOTH_HOOK_TRANSPORT_STATE_CHANGED),
                        PA_HOOK_NORMAL, (pa_hook_cb_t) transport_state_changed_cb, u);

2169 2170 2171 2172 2173 2174 2175
    u->transport_speaker_gain_changed_slot =
        pa_hook_connect(pa_bluetooth_discovery_hook(u->discovery, PA_BLUETOOTH_HOOK_TRANSPORT_SPEAKER_GAIN_CHANGED), PA_HOOK_NORMAL, (pa_hook_cb_t) transport_speaker_gain_changed_cb, u);

    u->transport_microphone_gain_changed_slot =
        pa_hook_connect(pa_bluetooth_discovery_hook(u->discovery, PA_BLUETOOTH_HOOK_TRANSPORT_MICROPHONE_GAIN_CHANGED), PA_HOOK_NORMAL, (pa_hook_cb_t) transport_microphone_gain_changed_cb, u);


2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227
    if (add_card(u) < 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 (u->profile != PA_BLUETOOTH_PROFILE_OFF)
        if (init_profile(u) < 0)
            goto off;

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

    return 0;

off:
    stop_thread(u);

    pa_assert_se(pa_card_set_profile(u->card, pa_hashmap_get(u->card->profiles, "off"), false) >= 0);

    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;

    stop_thread(u);

    if (u->device_connection_changed_slot)
        pa_hook_slot_free(u->device_connection_changed_slot);

    if (u->transport_state_changed_slot)
        pa_hook_slot_free(u->transport_state_changed_slot);

2228 2229 2230 2231 2232 2233
    if (u->transport_speaker_gain_changed_slot)
        pa_hook_slot_free(u->transport_speaker_gain_changed_slot);

    if (u->transport_microphone_gain_changed_slot)
        pa_hook_slot_free(u->transport_microphone_gain_changed_slot);

2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262
    if (u->sbc_info.buffer)
        pa_xfree(u->sbc_info.buffer);

    if (u->sbc_info.sbc_initialized)
        sbc_finish(&u->sbc_info.sbc);

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

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

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

    pa_xfree(u->output_port_name);
    pa_xfree(u->input_port_name);

    pa_xfree(u);
}

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);
}