bluetooth: Add support for Media API

Make use of D-Bus to transfer file descriptors.

1 files changed, 653 insertions, 13 deletions

diff --git a/src/modules/bluetooth/bluetooth-util.c b/src/modules/bluetooth/bluetooth-util.c
index c3b08ea3..bce27663 100644
--- a/src/modules/bluetooth/bluetooth-util.c
+++ b/src/modules/bluetooth/bluetooth-util.c
@@ -28,6 +28,38 @@
 #include <pulsecore/dbus-shared.h>
 
 #include "bluetooth-util.h"
+#include "ipc.h"
+
+#define HFP_AG_ENDPOINT "/MediaEndpoint/HFPAG"
+#define A2DP_SOURCE_ENDPOINT "/MediaEndpoint/A2DPSource"
+#define A2DP_SINK_ENDPOINT "/MediaEndpoint/A2DPSink"
+
+#define ENDPOINT_INTROSPECT_XML                                         \
+    DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                           \
+    "<node>"                                                            \
+    " <interface name=\"org.bluez.MediaEndpoint\">"                     \
+    "  <method name=\"SetConfiguration\">"                              \
+    "   <arg name=\"transport\" direction=\"in\" type=\"o\"/>"          \
+    "   <arg name=\"configuration\" direction=\"in\" type=\"ay\"/>"     \
+    "  </method>"                                                       \
+    "  <method name=\"SelectConfiguration\">"                           \
+    "   <arg name=\"capabilities\" direction=\"in\" type=\"ay\"/>"      \
+    "   <arg name=\"configuration\" direction=\"out\" type=\"ay\"/>"    \
+    "  </method>"                                                       \
+    "  <method name=\"ClearConfiguration\">"                            \
+    "  </method>"                                                       \
+    "  <method name=\"Release\">"                                       \
+    "  </method>"                                                       \
+    " </interface>"                                                     \
+    " <interface name=\"org.freedesktop.DBus.Introspectable\">"         \
+    "  <method name=\"Introspect\">"                                    \
+    "   <arg name=\"data\" type=\"s\" direction=\"out\"/>"              \
+    "  </method>"                                                       \
+    " </interface>"                                                     \
+    "</node>"
+
+#define MAX_BITPOOL 64
+#define MIN_BITPOOL 2U
 
 struct pa_bluetooth_discovery {
     PA_REFCNT_DECLARE;
@@ -86,6 +118,7 @@ static pa_bluetooth_device* device_new(const char *path) {
 
     d->name = NULL;
     d->path = pa_xstrdup(path);
+    d->transports = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
     d->paired = -1;
     d->alias = NULL;
     d->device_connected = -1;
@@ -103,11 +136,25 @@ static pa_bluetooth_device* device_new(const char *path) {
     return d;
 }
 
+static void transport_free(pa_bluetooth_transport *t) {
+    pa_assert(t);
+
+    pa_xfree(t->path);
+    pa_xfree(t->config);
+    pa_xfree(t);
+}
+
 static void device_free(pa_bluetooth_device *d) {
     pa_bluetooth_uuid *u;
+    pa_bluetooth_transport *t;
 
     pa_assert(d);
 
+    while ((t = pa_hashmap_steal_first(d->transports)))
+        transport_free(t);
+
+    pa_hashmap_free(d->transports, NULL, NULL);
+
     while ((u = d->uuids)) {
         PA_LLIST_REMOVE(pa_bluetooth_uuid, d->uuids, u);
         uuid_free(u);
@@ -331,6 +378,29 @@ static void remove_all_devices(pa_bluetooth_discovery *y) {
     }
 }
 
+static pa_bluetooth_device *found_device(pa_bluetooth_discovery *y, const char* path) {
+    DBusMessage *m;
+    pa_bluetooth_device *d;
+
+    pa_assert(y);
+    pa_assert(path);
+
+    d = pa_hashmap_get(y->devices, path);
+    if (d)
+        return d;
+
+    d = device_new(path);
+
+    pa_hashmap_put(y->devices, d->path, d);
+
+    pa_assert_se(m = dbus_message_new_method_call("org.bluez", path, "org.bluez.Device", "GetProperties"));
+    send_and_add_to_pending(y, d, m, get_properties_reply);
+
+    /* Before we read the other properties (Audio, AudioSink, AudioSource,
+     * Headset) we wait that the UUID is read */
+    return d;
+}
+
 static void get_properties_reply(DBusPendingCall *pending, void *userdata) {
     DBusMessage *r;
     DBusMessageIter arg_i, element_i;
@@ -415,6 +485,7 @@ static void get_properties_reply(DBusPendingCall *pending, void *userdata) {
             }  else if (dbus_message_has_interface(p->message, "org.bluez.HandsfreeGateway")) {
                 if (parse_audio_property(y, &d->hfgw_state, &arg_i) < 0)
                     goto finish;
+
             }
         }
 
@@ -448,25 +519,36 @@ static pa_dbus_pending* send_and_add_to_pending(pa_bluetooth_discovery *y, pa_bl
     return p;
 }
 
-static void found_device(pa_bluetooth_discovery *y, const char* path) {
-    DBusMessage *m;
-    pa_bluetooth_device *d;
+static void register_endpoint_reply(DBusPendingCall *pending, void *userdata) {
+    DBusError e;
+    DBusMessage *r;
+    pa_dbus_pending *p;
+    pa_bluetooth_discovery *y;
 
-    pa_assert(y);
-    pa_assert(path);
+    pa_assert(pending);
 
-    if (pa_hashmap_get(y->devices, path))
-        return;
+    dbus_error_init(&e);
 
-    d = device_new(path);
+    pa_assert_se(p = userdata);
+    pa_assert_se(y = p->context_data);
+    pa_assert_se(r = dbus_pending_call_steal_reply(pending));
 
-    pa_hashmap_put(y->devices, d->path, d);
+    if (dbus_message_is_error(r, DBUS_ERROR_SERVICE_UNKNOWN)) {
+        pa_log_debug("Bluetooth daemon is apparently not available.");
+        remove_all_devices(y);
+        goto finish;
+    }
 
-    pa_assert_se(m = dbus_message_new_method_call("org.bluez", path, "org.bluez.Device", "GetProperties"));
-    send_and_add_to_pending(y, d, m, get_properties_reply);
+    if (dbus_message_get_type(r) == DBUS_MESSAGE_TYPE_ERROR) {
+        pa_log("Error from RegisterEndpoint reply: %s", dbus_message_get_error_name(r));
+        goto finish;
+    }
 
-    /* Before we read the other properties (Audio, AudioSink, AudioSource,
-     * Headset) we wait that the UUID is read */
+finish:
+    dbus_message_unref(r);
+
+    PA_LLIST_REMOVE(pa_dbus_pending, y->pending, p);
+    pa_dbus_pending_free(p);
 }
 
 static void list_devices_reply(DBusPendingCall *pending, void *userdata) {
@@ -516,11 +598,126 @@ finish:
     pa_dbus_pending_free(p);
 }
 
+static void append_variant(DBusMessageIter *iter, int type, const void *val)
+{
+    DBusMessageIter value;
+    char sig[2] = { type, '\0' };
+
+    dbus_message_iter_open_container(iter, DBUS_TYPE_VARIANT, sig, &value);
+
+    dbus_message_iter_append_basic(&value, type, val);
+
+    dbus_message_iter_close_container(iter, &value);
+}
+
+static void append_array_variant(DBusMessageIter *iter, int type, const void *val, int n_elements)
+{
+    DBusMessageIter variant, array;
+    char type_sig[2] = { type, '\0' };
+    char array_sig[3] = { DBUS_TYPE_ARRAY, type, '\0' };
+
+    dbus_message_iter_open_container(iter, DBUS_TYPE_VARIANT, array_sig, &variant);
+
+    dbus_message_iter_open_container(&variant, DBUS_TYPE_ARRAY, type_sig, &array);
+
+    dbus_message_iter_append_fixed_array(&array, type, val, n_elements);
+
+    dbus_message_iter_close_container(&variant, &array);
+
+    dbus_message_iter_close_container(iter, &variant);
+}
+
+static void dict_append_entry(DBusMessageIter *dict, const char *key, int type, void *val)
+{
+    DBusMessageIter entry;
+
+    if (type == DBUS_TYPE_STRING) {
+        const char *str = *((const char **) val);
+        if (str == NULL)
+            return;
+    }
+
+    dbus_message_iter_open_container(dict, DBUS_TYPE_DICT_ENTRY, NULL, &entry);
+
+    dbus_message_iter_append_basic(&entry, DBUS_TYPE_STRING, &key);
+
+    append_variant(&entry, type, val);
+
+    dbus_message_iter_close_container(dict, &entry);
+}
+
+static void dict_append_array(DBusMessageIter *dict, const char *key, int type, void *val, int n_elements)
+{
+    DBusMessageIter entry;
+
+    dbus_message_iter_open_container(dict, DBUS_TYPE_DICT_ENTRY, NULL, &entry);
+
+    dbus_message_iter_append_basic(&entry, DBUS_TYPE_STRING, &key);
+
+    append_array_variant(&entry, type, val, n_elements);
+
+    dbus_message_iter_close_container(dict, &entry);
+}
+
+static void register_endpoint(pa_bluetooth_discovery *y, const char *path, const char *endpoint, const char *uuid)
+{
+    DBusMessage *m;
+    DBusMessageIter i, d;
+    uint8_t codec = 0;
+
+    pa_log_debug("Registering %s on adapter %s.", endpoint, path);
+
+    pa_assert_se(m = dbus_message_new_method_call("org.bluez", path, "org.bluez.Media", "RegisterEndpoint"));
+
+    dbus_message_iter_init_append(m, &i);
+
+    dbus_message_iter_append_basic(&i, DBUS_TYPE_OBJECT_PATH, &endpoint);
+
+    dbus_message_iter_open_container(&i, DBUS_TYPE_ARRAY, DBUS_DICT_ENTRY_BEGIN_CHAR_AS_STRING
+                                    DBUS_TYPE_STRING_AS_STRING DBUS_TYPE_VARIANT_AS_STRING DBUS_DICT_ENTRY_END_CHAR_AS_STRING,
+                                    &d);
+
+    dict_append_entry(&d, "UUID", DBUS_TYPE_STRING, &uuid);
+
+    dict_append_entry(&d, "Codec", DBUS_TYPE_BYTE, &codec);
+
+    if (pa_streq(uuid, HFP_AG_UUID)) {
+        uint8_t *caps = NULL;
+        dict_append_array(&d, "Capabilities", DBUS_TYPE_BYTE, &caps, 0);
+    } else {
+        sbc_capabilities_raw_t capabilities;
+        uint8_t *caps = (uint8_t *) &capabilities;
+
+        capabilities.channel_mode = BT_A2DP_CHANNEL_MODE_MONO | BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL |
+                                    BT_A2DP_CHANNEL_MODE_STEREO | BT_A2DP_CHANNEL_MODE_JOINT_STEREO;
+        capabilities.frequency = BT_SBC_SAMPLING_FREQ_16000 | BT_SBC_SAMPLING_FREQ_32000 |
+                                 BT_SBC_SAMPLING_FREQ_44100 | BT_SBC_SAMPLING_FREQ_48000;
+        capabilities.allocation_method = BT_A2DP_ALLOCATION_SNR | BT_A2DP_ALLOCATION_LOUDNESS;
+        capabilities.subbands = BT_A2DP_SUBBANDS_4 | BT_A2DP_SUBBANDS_8;
+        capabilities.block_length = BT_A2DP_BLOCK_LENGTH_4 | BT_A2DP_BLOCK_LENGTH_8 |
+                                    BT_A2DP_BLOCK_LENGTH_12 | BT_A2DP_BLOCK_LENGTH_16;
+        capabilities.min_bitpool = MIN_BITPOOL;
+        capabilities.max_bitpool = MAX_BITPOOL;
+
+        dict_append_array(&d, "Capabilities", DBUS_TYPE_BYTE, &caps, sizeof(capabilities));
+    }
+
+    dbus_message_iter_close_container(&i, &d);
+
+    send_and_add_to_pending(y, NULL, m, register_endpoint_reply);
+}
+
 static void found_adapter(pa_bluetooth_discovery *y, const char *path) {
     DBusMessage *m;
 
     pa_assert_se(m = dbus_message_new_method_call("org.bluez", path, "org.bluez.Adapter", "ListDevices"));
     send_and_add_to_pending(y, NULL, m, list_devices_reply);
+
+#ifdef DBUS_TYPE_UNIX_FD
+    register_endpoint(y, path, HFP_AG_ENDPOINT, HFP_AG_UUID);
+    register_endpoint(y, path, A2DP_SOURCE_ENDPOINT, A2DP_SOURCE_UUID);
+    register_endpoint(y, path, A2DP_SINK_ENDPOINT, A2DP_SINK_UUID);
+#endif
 }
 
 static void list_adapters_reply(DBusPendingCall *pending, void *userdata) {
@@ -769,6 +966,87 @@ const pa_bluetooth_device* pa_bluetooth_discovery_get_by_path(pa_bluetooth_disco
     return NULL;
 }
 
+const pa_bluetooth_transport* pa_bluetooth_discovery_get_transport(pa_bluetooth_discovery *y, const char *path) {
+    pa_bluetooth_device *d;
+    pa_bluetooth_transport *t;
+    void *state = NULL;
+
+    pa_assert(y);
+    pa_assert(PA_REFCNT_VALUE(y) > 0);
+    pa_assert(path);
+
+    while ((d = pa_hashmap_iterate(y->devices, &state, NULL)))
+        if ((t = pa_hashmap_get(d->transports, path)))
+            return t;
+
+    return NULL;
+}
+
+const pa_bluetooth_transport* pa_bluetooth_device_get_transport(const pa_bluetooth_device *d, enum profile profile) {
+    pa_bluetooth_transport *t;
+    void *state = NULL;
+
+    pa_assert(d);
+
+    while ((t = pa_hashmap_iterate(d->transports, &state, NULL)))
+        if (t->profile == profile)
+            return t;
+
+    return NULL;
+}
+
+int pa_bluetooth_transport_acquire(const pa_bluetooth_transport *t, const char *accesstype) {
+    DBusMessage *m, *r;
+    DBusError err;
+    int ret;
+
+    pa_assert(t);
+    pa_assert(t->y);
+
+    dbus_error_init(&err);
+
+    pa_assert_se(m = dbus_message_new_method_call("org.bluez", t->path, "org.bluez.MediaTransport", "Acquire"));
+    pa_assert_se(dbus_message_append_args(m, DBUS_TYPE_STRING, &accesstype, DBUS_TYPE_INVALID));
+    r = dbus_connection_send_with_reply_and_block(pa_dbus_connection_get(t->y->connection), m, -1, &err);
+
+    if (dbus_error_is_set(&err) || !r) {
+        pa_log("Failed to acquire transport fd: %s", err.message);
+        dbus_error_free(&err);
+        return -1;
+    }
+
+    if (!dbus_message_get_args(r, &err, DBUS_TYPE_UNIX_FD, &ret, DBUS_TYPE_INVALID)) {
+        pa_log("Failed to parse org.bluez.MediaTransport.Acquire(): %s", err.message);
+        ret = -1;
+        dbus_error_free(&err);
+        goto fail;
+    }
+
+fail:
+    dbus_message_unref(r);
+    return ret;
+}
+
+void pa_bluetooth_transport_release(const pa_bluetooth_transport *t, const char *accesstype) {
+    DBusMessage *m;
+    DBusError err;
+
+    pa_assert(t);
+    pa_assert(t->y);
+
+    dbus_error_init(&err);
+
+    pa_assert_se(m = dbus_message_new_method_call("org.bluez", t->path, "org.bluez.MediaTransport", "Release"));
+    pa_assert_se(dbus_message_append_args(m, DBUS_TYPE_STRING, &accesstype, DBUS_TYPE_INVALID));
+    dbus_connection_send_with_reply_and_block(pa_dbus_connection_get(t->y->connection), m, -1, &err);
+
+    if (dbus_error_is_set(&err)) {
+        pa_log("Failed to release transport %s: %s", t->path, err.message);
+        dbus_error_free(&err);
+    } else
+        pa_log_info("Transport %s released", t->path);
+}
+
 static int setup_dbus(pa_bluetooth_discovery *y) {
     DBusError err;
 
@@ -785,9 +1063,358 @@ static int setup_dbus(pa_bluetooth_discovery *y) {
     return 0;
 }
 
+static pa_bluetooth_transport *transport_new(pa_bluetooth_discovery *y, const char *path, enum profile p, const uint8_t *config, int size) {
+    pa_bluetooth_transport *t;
+
+    t = pa_xnew0(pa_bluetooth_transport, 1);
+    t->y = y;
+    t->path = pa_xstrdup(path);
+    t->profile = p;
+    t->config_size = size;
+
+    if (size > 0) {
+        t->config = pa_xnew(uint8_t, size);
+        memcpy(t->config, config, size);
+    }
+
+    return t;
+}
+
+static DBusMessage *endpoint_set_configuration(DBusConnection *conn, DBusMessage *m, void *userdata) {
+    pa_bluetooth_discovery *y = userdata;
+    pa_bluetooth_device *d;
+    pa_bluetooth_transport *t;
+    const char *path, *dev_path = NULL, *uuid = NULL;
+    uint8_t *config = NULL;
+    int size = 0;
+    enum profile p;
+    DBusMessageIter args, props;
+    DBusMessage *r;
+
+    dbus_message_iter_init(m, &args);
+
+    dbus_message_iter_get_basic(&args, &path);
+    if (!dbus_message_iter_next(&args))
+        goto fail;
+
+    dbus_message_iter_recurse(&args, &props);
+    if (dbus_message_iter_get_arg_type(&props) != DBUS_TYPE_DICT_ENTRY)
+        goto fail;
+
+    /* Read transport properties */
+    while (dbus_message_iter_get_arg_type(&props) == DBUS_TYPE_DICT_ENTRY) {
+        const char *key;
+        DBusMessageIter value, entry;
+        int var;
+
+        dbus_message_iter_recurse(&props, &entry);
+        dbus_message_iter_get_basic(&entry, &key);
+
+        dbus_message_iter_next(&entry);
+        dbus_message_iter_recurse(&entry, &value);
+
+        var = dbus_message_iter_get_arg_type(&value);
+        if (strcasecmp(key, "UUID") == 0) {
+            if (var != DBUS_TYPE_STRING)
+                goto fail;
+            dbus_message_iter_get_basic(&value, &uuid);
+        } else if (strcasecmp(key, "Device") == 0) {
+            if (var != DBUS_TYPE_OBJECT_PATH)
+                goto fail;
+            dbus_message_iter_get_basic(&value, &dev_path);
+        } else if (strcasecmp(key, "Configuration") == 0) {
+            DBusMessageIter array;
+            if (var != DBUS_TYPE_ARRAY)
+                goto fail;
+            dbus_message_iter_recurse(&value, &array);
+            dbus_message_iter_get_fixed_array(&array, &config, &size);
+        }
+
+        dbus_message_iter_next(&props);
+    }
+
+    d = found_device(y, dev_path);
+    if (!d)
+        goto fail;
+
+    if (dbus_message_has_path(m, HFP_AG_ENDPOINT))
+        p = PROFILE_HSP;
+    else if (dbus_message_has_path(m, A2DP_SOURCE_ENDPOINT))
+        p = PROFILE_A2DP;
+    else
+        p = PROFILE_A2DP_SOURCE;
+
+    t = transport_new(y, path, p, config, size);
+    pa_hashmap_put(d->transports, t->path, t);
+
+    pa_log_debug("Transport %s profile %d available", t->path, t->profile);
+
+    pa_assert_se(r = dbus_message_new_method_return(m));
+
+    return r;
+
+fail:
+    pa_log("org.bluez.MediaEndpoint.SetConfiguration: invalid arguments");
+    pa_assert_se(r = (dbus_message_new_error(m, "org.bluez.MediaEndpoint.Error.InvalidArguments",
+                                                        "Unable to set configuration")));
+    return r;
+}
+
+static DBusMessage *endpoint_clear_configuration(DBusConnection *c, DBusMessage *m, void *userdata) {
+    pa_bluetooth_discovery *y = userdata;
+    pa_bluetooth_device *d;
+    pa_bluetooth_transport *t;
+    void *state = NULL;
+    DBusMessage *r;
+    DBusError e;
+    const char *path;
+
+    dbus_error_init(&e);
+
+    if (!dbus_message_get_args(m, &e, DBUS_TYPE_OBJECT_PATH, &path, DBUS_TYPE_INVALID)) {
+        pa_log("org.bluez.MediaEndpoint.ClearConfiguration: %s", e.message);
+        dbus_error_free(&e);
+        goto fail;
+    }
+
+    while ((d = pa_hashmap_iterate(y->devices, &state, NULL))) {
+        if ((t = pa_hashmap_get(d->transports, path))) {
+            pa_log_debug("Clearing transport %s profile %d", t->path, t->profile);
+            pa_hashmap_remove(d->transports, t->path);
+            transport_free(t);
+            break;
+        }
+    }
+
+    pa_assert_se(r = dbus_message_new_method_return(m));
+
+    return r;
+
+fail:
+    pa_assert_se(r = (dbus_message_new_error(m, "org.bluez.MediaEndpoint.Error.InvalidArguments",
+                                                        "Unable to clear configuration")));
+    return r;
+}
+
+static uint8_t a2dp_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 DBusMessage *endpoint_select_configuration(DBusConnection *c, DBusMessage *m, void *userdata) {
+    pa_bluetooth_discovery *y = userdata;
+    sbc_capabilities_raw_t *cap, config;
+    uint8_t *pconf = (uint8_t *) &config;
+    int i, size;
+    DBusMessage *r;
+    DBusError e;
+
+    static const struct {
+        uint32_t rate;
+        uint8_t cap;
+    } freq_table[] = {
+        { 16000U, BT_SBC_SAMPLING_FREQ_16000 },
+        { 32000U, BT_SBC_SAMPLING_FREQ_32000 },
+        { 44100U, BT_SBC_SAMPLING_FREQ_44100 },
+        { 48000U, BT_SBC_SAMPLING_FREQ_48000 }
+    };
+
+    dbus_error_init(&e);
+
+    if (!dbus_message_get_args(m, &e, DBUS_TYPE_ARRAY, DBUS_TYPE_BYTE, &cap, &size, DBUS_TYPE_INVALID)) {
+        pa_log("org.bluez.MediaEndpoint.SelectConfiguration: %s", e.message);
+        dbus_error_free(&e);
+        goto fail;
+    }
+
+    if (dbus_message_has_path(m, HFP_AG_ENDPOINT))
+        goto done;
+
+    pa_assert(size == sizeof(config));
+
+    memset(&config, 0, sizeof(config));
+
+    /* Find the lowest freq that is at least as high as the requested
+     * sampling rate */
+    for (i = 0; (unsigned) i < PA_ELEMENTSOF(freq_table); i++)
+        if (freq_table[i].rate >= y->core->default_sample_spec.rate && (cap->frequency & freq_table[i].cap)) {
+            config.frequency = freq_table[i].cap;
+            break;
+        }
+
+    if ((unsigned) i == PA_ELEMENTSOF(freq_table)) {
+        for (--i; i >= 0; i--) {
+            if (cap->frequency & freq_table[i].cap) {
+                config.frequency = freq_table[i].cap;
+                break;
+            }
+        }
+
+        if (i < 0) {
+            pa_log("Not suitable sample rate");
+            goto fail;
+        }
+    }
+
+    pa_assert((unsigned) i < PA_ELEMENTSOF(freq_table));
+
+    if (y->core->default_sample_spec.channels <= 1) {
+        if (cap->channel_mode & BT_A2DP_CHANNEL_MODE_MONO)
+            config.channel_mode = BT_A2DP_CHANNEL_MODE_MONO;
+    }
+
+    if (y->core->default_sample_spec.channels >= 2) {
+        if (cap->channel_mode & BT_A2DP_CHANNEL_MODE_JOINT_STEREO)
+            config.channel_mode = BT_A2DP_CHANNEL_MODE_JOINT_STEREO;
+        else if (cap->channel_mode & BT_A2DP_CHANNEL_MODE_STEREO)
+            config.channel_mode = BT_A2DP_CHANNEL_MODE_STEREO;
+        else if (cap->channel_mode & BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL)
+            config.channel_mode = BT_A2DP_CHANNEL_MODE_DUAL_CHANNEL;
+        else if (cap->channel_mode & BT_A2DP_CHANNEL_MODE_MONO) {
+            config.channel_mode = BT_A2DP_CHANNEL_MODE_MONO;
+        } else {
+            pa_log("No supported channel modes");
+            goto fail;
+        }
+    }
+
+    if (cap->block_length & BT_A2DP_BLOCK_LENGTH_16)
+        config.block_length = BT_A2DP_BLOCK_LENGTH_16;
+    else if (cap->block_length & BT_A2DP_BLOCK_LENGTH_12)
+        config.block_length = BT_A2DP_BLOCK_LENGTH_12;
+    else if (cap->block_length & BT_A2DP_BLOCK_LENGTH_8)
+        config.block_length = BT_A2DP_BLOCK_LENGTH_8;
+    else if (cap->block_length & BT_A2DP_BLOCK_LENGTH_4)
+        config.block_length = BT_A2DP_BLOCK_LENGTH_4;
+    else {
+        pa_log_error("No supported block lengths");
+        goto fail;
+    }
+
+    if (cap->subbands & BT_A2DP_SUBBANDS_8)
+        config.subbands = BT_A2DP_SUBBANDS_8;
+    else if (cap->subbands & BT_A2DP_SUBBANDS_4)
+        config.subbands = BT_A2DP_SUBBANDS_4;
+    else {
+        pa_log_error("No supported subbands");
+        goto fail;
+    }
+
+    if (cap->allocation_method & BT_A2DP_ALLOCATION_LOUDNESS)
+        config.allocation_method = BT_A2DP_ALLOCATION_LOUDNESS;
+    else if (cap->allocation_method & BT_A2DP_ALLOCATION_SNR)
+        config.allocation_method = BT_A2DP_ALLOCATION_SNR;
+
+    config.min_bitpool = (uint8_t) PA_MAX(MIN_BITPOOL, cap->min_bitpool);
+    config.max_bitpool = (uint8_t) PA_MIN(a2dp_default_bitpool(config.frequency, config.channel_mode), cap->max_bitpool);
+
+done:
+    pa_assert_se(r = dbus_message_new_method_return(m));
+
+    pa_assert_se(dbus_message_append_args(
+                                     r,
+                                     DBUS_TYPE_ARRAY, DBUS_TYPE_BYTE, &pconf, size,
+                                     DBUS_TYPE_INVALID));
+
+    return r;
+
+fail:
+    pa_assert_se(r = (dbus_message_new_error(m, "org.bluez.MediaEndpoint.Error.InvalidArguments",
+                                                        "Unable to select configuration")));
+    return r;
+}
+
+static DBusHandlerResult endpoint_handler(DBusConnection *c, DBusMessage *m, void *userdata) {
+    struct pa_bluetooth_discovery *y = userdata;
+    DBusMessage *r = NULL;
+    DBusError e;
+    const char *path;
+
+    pa_assert(y);
+
+    pa_log_debug("dbus: interface=%s, path=%s, member=%s\n",
+            dbus_message_get_interface(m),
+            dbus_message_get_path(m),
+            dbus_message_get_member(m));
+
+    path = dbus_message_get_path(m);
+    dbus_error_init(&e);
+
+    if (!pa_streq(path, A2DP_SOURCE_ENDPOINT) && !pa_streq(path, A2DP_SINK_ENDPOINT) && !pa_streq(path, HFP_AG_ENDPOINT))
+        return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
+
+    if (dbus_message_is_method_call(m, "org.freedesktop.DBus.Introspectable", "Introspect")) {
+        const char *xml = ENDPOINT_INTROSPECT_XML;
+
+        pa_assert_se(r = dbus_message_new_method_return(m));
+        pa_assert_se(dbus_message_append_args(
+                                 r,
+                                 DBUS_TYPE_STRING, &xml,
+                                 DBUS_TYPE_INVALID));
+
+    } else if (dbus_message_is_method_call(m, "org.bluez.MediaEndpoint", "SetConfiguration")) {
+        r = endpoint_set_configuration(c, m, userdata);
+    } else if (dbus_message_is_method_call(m, "org.bluez.MediaEndpoint", "SelectConfiguration")) {
+        r = endpoint_select_configuration(c, m, userdata);
+    } else if (dbus_message_is_method_call(m, "org.bluez.MediaEndpoint", "ClearConfiguration"))
+        r = endpoint_clear_configuration(c, m, userdata);
+    else
+        return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
+
+    if (r) {
+        pa_assert_se(dbus_connection_send(pa_dbus_connection_get(y->connection), r, NULL));
+        dbus_message_unref(r);
+    }
+
+    return DBUS_HANDLER_RESULT_HANDLED;
+}
+
 pa_bluetooth_discovery* pa_bluetooth_discovery_get(pa_core *c) {
     DBusError err;
     pa_bluetooth_discovery *y;
+    static const DBusObjectPathVTable vtable_endpoint = {
+        .message_function = endpoint_handler,
+    };
 
     pa_assert(c);
 
@@ -832,6 +1459,12 @@ pa_bluetooth_discovery* pa_bluetooth_discovery_get(pa_core *c) {
         goto fail;
     }
 
+#ifdef DBUS_TYPE_UNIX_FD
+    pa_assert_se(dbus_connection_register_object_path(pa_dbus_connection_get(y->connection), HFP_AG_ENDPOINT, &vtable_endpoint, y));
+    pa_assert_se(dbus_connection_register_object_path(pa_dbus_connection_get(y->connection), A2DP_SOURCE_ENDPOINT, &vtable_endpoint, y));
+    pa_assert_se(dbus_connection_register_object_path(pa_dbus_connection_get(y->connection), A2DP_SINK_ENDPOINT, &vtable_endpoint, y));
+#endif
+
     list_adapters(y);
 
     return y;
@@ -870,6 +1503,11 @@ void pa_bluetooth_discovery_unref(pa_bluetooth_discovery *y) {
     }
 
     if (y->connection) {
+#ifdef DBUS_TYPE_UNIX_FD
+        dbus_connection_unregister_object_path(pa_dbus_connection_get(y->connection), HFP_AG_ENDPOINT);
+        dbus_connection_unregister_object_path(pa_dbus_connection_get(y->connection), A2DP_SOURCE_ENDPOINT);
+        dbus_connection_unregister_object_path(pa_dbus_connection_get(y->connection), A2DP_SINK_ENDPOINT);
+#endif
         pa_dbus_remove_matches(pa_dbus_connection_get(y->connection),
                                "type='signal',sender='org.freedesktop.DBus',interface='org.freedesktop.DBus',member='NameOwnerChanged',arg0='org.bluez'",
                                "type='signal',sender='org.bluez',interface='org.bluez.Manager',member='AdapterAdded'",
@@ -888,6 +1526,8 @@ void pa_bluetooth_discovery_unref(pa_bluetooth_discovery *y) {
         if (y->filter_added)
             dbus_connection_remove_filter(pa_dbus_connection_get(y->connection), filter_cb, y);
 
+        dbus_connection_remove_filter(pa_dbus_connection_get(y->connection), filter_cb, y);
+
         pa_dbus_connection_unref(y->connection);
     }