This adds initial code for mcp plugin which handles Media Control Profile
and Generic Media Control Service for Client Role.
---
Makefile.plugins | 5 +
configure.ac | 4 +
profiles/audio/mcp.c | 429 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 438 insertions(+)
create mode 100644 profiles/audio/mcp.c
diff --git a/Makefile.plugins b/Makefile.plugins
index a3654980f..20cac384e 100644
--- a/Makefile.plugins
+++ b/Makefile.plugins
@@ -122,6 +122,11 @@ builtin_modules += bap
builtin_sources += profiles/audio/bap.c
endif
+if MCP
+builtin_modules += mcp
+builtin_sources += profiles/audio/mcp.c
+endif
+
if VCP
builtin_modules += vcp
builtin_sources += profiles/audio/vcp.c
diff --git a/configure.ac b/configure.ac
index 79645e691..363a222a7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -199,6 +199,10 @@ AC_ARG_ENABLE(bap, AS_HELP_STRING([--disable-bap],
[disable BAP profile]), [enable_bap=${enableval}])
AM_CONDITIONAL(BAP, test "${enable_bap}" != "no")
+AC_ARG_ENABLE(mcp, AS_HELP_STRING([--disable-mcp],
+ [disable MCP profile]), [enable_mcp=${enableval}])
+AM_CONDITIONAL(MCP, test "${enable_mcp}" != "no")
+
AC_ARG_ENABLE(vcp, AS_HELP_STRING([--disable-vcp],
[disable VCP profile]), [enable_vcp=${enableval}])
AM_CONDITIONAL(VCP, test "${enable_vcp}" != "no")
diff --git a/profiles/audio/mcp.c b/profiles/audio/mcp.c
new file mode 100644
index 000000000..0a8d83198
--- /dev/null
+++ b/profiles/audio/mcp.c
@@ -0,0 +1,429 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *
+ * BlueZ - Bluetooth protocol stack for Linux
+ *
+ * Copyright (C) 2020 Intel Corporation. All rights reserved.
+ *
+ *
+ */
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#define _GNU_SOURCE
+
+#include <ctype.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include <glib.h>
+
+#include "gdbus/gdbus.h"
+
+#include "lib/bluetooth.h"
+#include "lib/hci.h"
+#include "lib/sdp.h"
+#include "lib/uuid.h"
+
+#include "src/dbus-common.h"
+#include "src/shared/util.h"
+#include "src/shared/att.h"
+#include "src/shared/queue.h"
+#include "src/shared/gatt-db.h"
+#include "src/shared/gatt-client.h"
+#include "src/shared/gatt-server.h"
+#include "src/shared/mcp.h"
+#include "src/shared/mcs.h"
+
+#include "btio/btio.h"
+#include "src/plugin.h"
+#include "src/adapter.h"
+#include "src/gatt-database.h"
+#include "src/device.h"
+#include "src/profile.h"
+#include "src/service.h"
+#include "src/log.h"
+#include "src/error.h"
+#include "player.h"
+
+#define GMCS_UUID_STR "00001849-0000-1000-8000-00805f9b34fb"
+
+struct mcp_data {
+ struct btd_device *device;
+ struct btd_service *service;
+ struct bt_mcp *mcp;
+ unsigned int state_id;
+
+ struct media_player *mp;
+};
+
+static void mcp_debug(const char *str, void *user_data)
+{
+ DBG_IDX(0xffff, "%s", str);
+}
+
+static char *name2utf8(const uint8_t *name, uint16_t len)
+{
+ char utf8_name[HCI_MAX_NAME_LENGTH + 2];
+ int i;
+
+ if (g_utf8_validate((const char *) name, len, NULL))
+ return g_strndup((char *) name, len);
+
+ len = MIN(len, sizeof(utf8_name) - 1);
+
+ memset(utf8_name, 0, sizeof(utf8_name));
+ strncpy(utf8_name, (char *) name, len);
+
+ /* Assume ASCII, and replace all non-ASCII with spaces */
+ for (i = 0; utf8_name[i] != '\0'; i++) {
+ if (!isascii(utf8_name[i]))
+ utf8_name[i] = ' ';
+ }
+
+ /* Remove leading and trailing whitespace characters */
+ g_strstrip(utf8_name);
+
+ return g_strdup(utf8_name);
+}
+
+static const char *mcp_status_val_to_string(uint8_t status)
+{
+ switch (status) {
+ case BT_MCS_STATUS_PLAYING:
+ return "playing";
+ case BT_MCS_STATUS_PAUSED:
+ return "paused";
+ case BT_MCS_STATUS_INACTIVE:
+ return "stopped";
+ case BT_MCS_STATUS_SEEKING:
+ /* TODO: find a way for fwd/rvs seeking, probably by storing
+ * control point operation sent before
+ */
+ return "forward-seek";
+ default:
+ return "error";
+ }
+}
+
+static struct mcp_data *mcp_data_new(struct btd_device *device)
+{
+ struct mcp_data *data;
+
+ data = new0(struct mcp_data, 1);
+ data->device = device;
+
+ return data;
+}
+
+static void cb_player_name(struct bt_mcp *mcp, const uint8_t *value,
+ uint16_t length)
+{
+ char *name;
+ struct media_player *mp = bt_mcp_get_user_data(mcp);
+
+ name = name2utf8(value, length);
+ DBG("Media Player Name %s", (const char *)name);
+
+ media_player_set_name(mp, name);
+
+ g_free(name);
+}
+
+void cb_track_changed(struct bt_mcp *mcp)
+{
+ DBG("Track Changed");
+ /* Since track changed has happened
+ * track title notification is expected
+ */
+}
+
+void cb_track_title(struct bt_mcp *mcp, const uint8_t *value,
+ uint16_t length)
+{
+ char *name;
+ uint16_t len;
+ struct media_player *mp = bt_mcp_get_user_data(mcp);
+
+ name = name2utf8(value, length);
+ len = strlen(name);
+
+ DBG("Track Title %s", (const char *)name);
+
+ media_player_set_metadata(mp, NULL, "Title", name, len);
+ media_player_metadata_changed(mp);
+
+ g_free(name);
+}
+
+void cb_track_duration(struct bt_mcp *mcp, int32_t duration)
+{
+ struct media_player *mp = bt_mcp_get_user_data(mcp);
+ unsigned char buf[10];
+
+ /* MCP defines duration is int32 but api takes it as uint32 */
+ sprintf(buf, "%d", duration);
+ media_player_set_metadata(mp, NULL, "Duration", buf, sizeof(buf));
+ media_player_metadata_changed(mp);
+}
+
+void cb_track_position(struct bt_mcp *mcp, int32_t duration)
+{
+ struct media_player *mp = bt_mcp_get_user_data(mcp);
+
+ /* MCP defines duration is int32 but api takes it as uint32 */
+ media_player_set_position(mp, duration);
+}
+
+void cb_media_state(struct bt_mcp *mcp, uint8_t status)
+{
+ struct media_player *mp = bt_mcp_get_user_data(mcp);
+
+ media_player_set_status(mp, mcp_status_val_to_string(status));
+}
+
+static const struct bt_mcp_event_callback cbs = {
+ .player_name = &cb_player_name,
+ .track_changed = &cb_track_changed,
+ .track_title = &cb_track_title,
+ .track_duration = &cb_track_duration,
+ .track_position = &cb_track_position,
+ .playback_speed = NULL,
+ .seeking_speed = NULL,
+ .play_order = NULL,
+ .play_order_supported = NULL,
+ .media_state = &cb_media_state,
+ .content_control_id = NULL,
+};
+
+static int ct_play(struct media_player *mp, void *user_data)
+{
+ struct bt_mcp *mcp = user_data;
+
+ return bt_mcp_play(mcp);
+}
+
+static int ct_pause(struct media_player *mp, void *user_data)
+{
+ struct bt_mcp *mcp = user_data;
+
+ return bt_mcp_pause(mcp);
+}
+
+static int ct_stop(struct media_player *mp, void *user_data)
+{
+ struct bt_mcp *mcp = user_data;
+
+ return bt_mcp_stop(mcp);
+}
+
+static const struct media_player_callback ct_cbs = {
+ .set_setting = NULL,
+ .play = &ct_play,
+ .pause = &ct_pause,
+ .stop = &ct_stop,
+ .next = NULL,
+ .previous = NULL,
+ .fast_forward = NULL,
+ .rewind = NULL,
+ .press = NULL,
+ .hold = NULL,
+ .release = NULL,
+ .list_items = NULL,
+ .change_folder = NULL,
+ .search = NULL,
+ .play_item = NULL,
+ .add_to_nowplaying = NULL,
+ .total_items = NULL,
+};
+
+static int mcp_probe(struct btd_service *service)
+{
+ struct btd_device *device = btd_service_get_device(service);
+ struct btd_adapter *adapter = device_get_adapter(device);
+ struct btd_gatt_database *database = btd_adapter_get_database(adapter);
+ struct mcp_data *data = btd_service_get_user_data(service);
+ char addr[18];
+
+ ba2str(device_get_address(device), addr);
+ DBG("%s", addr);
+
+ /* Ignore, if we were probed for this device already */
+ if (data) {
+ error("Profile probed twice for the same device!");
+ return -EINVAL;
+ }
+
+ data = mcp_data_new(device);
+ data->service = service;
+
+ data->mcp = bt_mcp_new(btd_gatt_database_get_db(database),
+ btd_device_get_gatt_db(device));
+
+ bt_mcp_set_debug(data->mcp, mcp_debug, NULL, NULL);
+ btd_service_set_user_data(service, data);
+
+ return 0;
+}
+
+static void mcp_data_free(struct mcp_data *data)
+{
+ DBG("");
+
+ if (data->service) {
+ btd_service_set_user_data(data->service, NULL);
+ bt_mcp_set_user_data(data->mcp, NULL);
+ }
+
+ if (data->mp) {
+ media_player_destroy(data->mp);
+ data->mp = NULL;
+ }
+
+ bt_mcp_unref(data->mcp);
+ free(data);
+}
+
+static void mcp_data_remove(struct mcp_data *data)
+{
+ DBG("data %p", data);
+
+ mcp_data_free(data);
+}
+
+static void mcp_remove(struct btd_service *service)
+{
+ struct btd_device *device = btd_service_get_device(service);
+ struct mcp_data *data;
+ char addr[18];
+
+ ba2str(device_get_address(device), addr);
+ DBG("%s", addr);
+
+ data = btd_service_get_user_data(service);
+ if (!data) {
+ error("MCP service not handled by profile");
+ return;
+ }
+
+ mcp_data_remove(data);
+}
+
+static int mcp_accept(struct btd_service *service)
+{
+ struct btd_device *device = btd_service_get_device(service);
+ struct bt_gatt_client *client = btd_device_get_gatt_client(device);
+ struct mcp_data *data = btd_service_get_user_data(service);
+ char addr[18];
+
+ ba2str(device_get_address(device), addr);
+ DBG("%s", addr);
+
+ bt_mcp_attach(data->mcp, client);
+
+ data->mp = media_player_controller_create(device_get_path(device), 0);
+ if (data->mp == NULL) {
+ DBG("Unable to create Media Player");
+ return -EINVAL;
+ }
+
+ media_player_set_callbacks(data->mp, &ct_cbs, data->mcp);
+
+ bt_mcp_set_user_data(data->mcp, data->mp);
+ bt_mcp_set_event_callbacks(data->mcp, &cbs, data->mp);
+ btd_service_connecting_complete(service, 0);
+
+ return 0;
+}
+
+static int mcp_connect(struct btd_service *service)
+{
+ struct btd_device *device = btd_service_get_device(service);
+ char addr[18];
+
+ ba2str(device_get_address(device), addr);
+ DBG("%s", addr);
+
+ return 0;
+}
+
+static int mcp_disconnect(struct btd_service *service)
+{
+ struct btd_device *device = btd_service_get_device(service);
+ struct mcp_data *data = btd_service_get_user_data(service);
+ char addr[18];
+
+ ba2str(device_get_address(device), addr);
+ DBG("%s", addr);
+
+ if (data->mp) {
+ media_player_destroy(data->mp);
+ data->mp = NULL;
+ }
+
+ bt_mcp_detach(data->mcp);
+
+ btd_service_disconnecting_complete(service, 0);
+
+ return 0;
+}
+
+static int media_control_server_probe(struct btd_profile *p,
+ struct btd_adapter *adapter)
+{
+ struct btd_gatt_database *database = btd_adapter_get_database(adapter);
+ bt_mcp_register(btd_gatt_database_get_db(database));
+ return 0;
+}
+
+static void media_control_server_remove(struct btd_profile *p,
+ struct btd_adapter *adapter)
+{
+
+}
+
+static struct btd_profile mcp_profile = {
+ .name = "mcp",
+ .priority = BTD_PROFILE_PRIORITY_MEDIUM,
+ .remote_uuid = GMCS_UUID_STR,
+ .device_probe = mcp_probe,
+ .device_remove = mcp_remove,
+ .accept = mcp_accept,
+ .connect = mcp_connect,
+ .disconnect = mcp_disconnect,
+
+ .adapter_probe = media_control_server_probe,
+ .adapter_remove = media_control_server_remove,
+};
+
+static int mcp_init(void)
+{
+ DBG("");
+
+ if (!(g_dbus_get_flags() & G_DBUS_FLAG_ENABLE_EXPERIMENTAL)) {
+ warn("D-Bus experimental not enabled");
+ return -ENOTSUP;
+ }
+
+ btd_profile_register(&mcp_profile);
+ return 0;
+}
+
+static void mcp_exit(void)
+{
+ DBG("");
+
+ if (g_dbus_get_flags() & G_DBUS_FLAG_ENABLE_EXPERIMENTAL) {
+ btd_profile_unregister(&mcp_profile);
+ }
+}
+
+BLUETOOTH_PLUGIN_DEFINE(mcp, VERSION, BLUETOOTH_PLUGIN_PRIORITY_DEFAULT,
+ mcp_init, mcp_exit)
--
2.25.1
