ChangeTrack() is used by applications to inform BlueZ that current track
changed, passing also the metadata. It's expected to work only when the
device is in TG role.
---
audio/control.c | 167 +++++++++++++++++++++++++++++++++++++++++++++++++++
doc/control-api.txt | 3 +
2 files changed, 170 insertions(+), 0 deletions(-)
diff --git a/audio/control.c b/audio/control.c
index 03f1cb4..670660f 100644
--- a/audio/control.c
+++ b/audio/control.c
@@ -261,6 +261,13 @@ struct avctp_server {
struct media_info {
enum play_status status;
uint32_t current_position;
+
+ char *title;
+ char *artist;
+ char *album;
+ char *genre;
+ uint32_t ntracks;
+ uint32_t track;
uint32_t track_length;
};
@@ -1240,6 +1247,47 @@ static void media_info_init(struct media_info *mi)
mi->current_position = 0xFFFFFFFF;
}
+static void media_info_reset(struct media_info *mi)
+{
+ DBG("");
+
+ if (mi->title)
+ free(mi->title);
+
+ if (mi->artist)
+ free(mi->artist);
+
+ if (mi->album)
+ free(mi->album);
+
+ if (mi->genre)
+ free(mi->genre);
+
+ media_info_init(mi);
+}
+
+static void media_info_copy(struct media_info *dest, struct media_info *src)
+{
+ DBG("");
+
+ if (src->title)
+ dest->title = strdup(src->title);
+
+ if (src->artist)
+ dest->artist = strdup(src->artist);
+
+ if (src->album)
+ dest->album = strdup(src->album);
+
+ if (src->genre)
+ dest->genre = strdup(src->genre);
+
+ dest->ntracks = src->ntracks;
+ dest->track = src->track;
+ dest->track_length = src->track_length;
+}
+
+
static void avctp_connect_cb(GIOChannel *chan, GError *err, gpointer data)
{
struct control *control = data;
@@ -1817,6 +1865,124 @@ static DBusMessage *control_change_playback(DBusConnection *conn,
return dbus_message_new_method_return(msg);
}
+static gboolean media_info_parse(DBusMessageIter *iter, struct media_info *mi)
+{
+ DBusMessageIter dict;
+ DBusMessageIter var;
+ int ctype;
+
+ ctype = dbus_message_iter_get_arg_type(iter);
+ if (ctype != DBUS_TYPE_ARRAY)
+ return FALSE;
+
+ media_info_init(mi);
+ dbus_message_iter_recurse(iter, &dict);
+
+ while ((ctype = dbus_message_iter_get_arg_type(&dict)) !=
+ DBUS_TYPE_INVALID) {
+ DBusMessageIter entry;
+ const char *key;
+
+ if (ctype != DBUS_TYPE_DICT_ENTRY)
+ return FALSE;
+
+ dbus_message_iter_recurse(&dict, &entry);
+ if (dbus_message_iter_get_arg_type(&entry) != DBUS_TYPE_STRING)
+ return FALSE;
+
+ dbus_message_iter_get_basic(&entry, &key);
+ dbus_message_iter_next(&entry);
+
+ if (dbus_message_iter_get_arg_type(&entry) != DBUS_TYPE_VARIANT)
+ return FALSE;
+
+ dbus_message_iter_recurse(&entry, &var);
+
+ if (!strcmp(key, "Title")) {
+ if (dbus_message_iter_get_arg_type(&var) !=
+ DBUS_TYPE_STRING)
+ return FALSE;
+
+ dbus_message_iter_get_basic(&var, &mi->title);
+ } else if (!strcmp(key, "Artist")) {
+ if (dbus_message_iter_get_arg_type(&var) !=
+ DBUS_TYPE_STRING)
+ return FALSE;
+
+ dbus_message_iter_get_basic(&var, &mi->artist);
+ } else if (!strcmp(key, "Album")) {
+ if (dbus_message_iter_get_arg_type(&var) !=
+ DBUS_TYPE_STRING)
+ return FALSE;
+
+ dbus_message_iter_get_basic(&var, &mi->album);
+ } else if (!strcmp(key, "Genre")) {
+ if (dbus_message_iter_get_arg_type(&var) !=
+ DBUS_TYPE_STRING)
+ return FALSE;
+
+ dbus_message_iter_get_basic(&var, &mi->genre);
+ } else if (!strcmp(key, "NumberOfTracks")) {
+ if (dbus_message_iter_get_arg_type(&var) !=
+ DBUS_TYPE_UINT32)
+ return FALSE;
+
+ dbus_message_iter_get_basic(&var, &mi->ntracks);
+ } else if (!strcmp(key, "TrackNumber")) {
+ if (dbus_message_iter_get_arg_type(&var) !=
+ DBUS_TYPE_UINT32)
+ return FALSE;
+
+ dbus_message_iter_get_basic(&var, &mi->track);
+ } else if (!strcmp(key, "TrackDuration")) {
+ if (dbus_message_iter_get_arg_type(&var) !=
+ DBUS_TYPE_UINT32)
+ return FALSE;
+
+ dbus_message_iter_get_basic(&var, &mi->track_length);
+ } else {
+ return FALSE;
+ }
+
+ dbus_message_iter_next(&dict);
+ }
+
+ if (mi->title == NULL)
+ return FALSE;
+
+ return TRUE;
+}
+
+static DBusMessage *control_change_track(DBusConnection *conn,
+ DBusMessage *msg, void *data)
+{
+ struct audio_device *device = data;
+ struct control *control = device->control;
+ DBusMessageIter iter;
+ struct media_info mi;
+
+ if (control->state != AVCTP_STATE_CONNECTED)
+ return btd_error_not_connected(msg);
+
+ if (control->target) /* Only supported if this device is in TG role */
+ return btd_error_not_supported(msg);
+
+ dbus_message_iter_init(msg, &iter);
+ if (!media_info_parse(&iter, &mi))
+ return btd_error_invalid_args(msg);
+
+ media_info_reset(&control->mi);
+ media_info_copy(&control->mi, &mi);
+
+ DBG("Track change:\n\ttitle: %s\n\tartist: %s\n\talbum: %s\n"
+ "\tgenre: %s\n\tNumber of tracks: %u\n"
+ "\tTrack number: %u\n\tTrack duration: %u",
+ mi.title, mi.artist, mi.album, mi.genre,
+ mi.ntracks, mi.track, mi.track_length);
+
+ return dbus_message_new_method_return(msg);
+}
+
static GDBusMethodTable control_methods[] = {
{ "IsConnected", "", "b", control_is_connected,
G_DBUS_METHOD_FLAG_DEPRECATED },
@@ -1825,6 +1991,7 @@ static GDBusMethodTable control_methods[] = {
{ "VolumeDown", "", "", volume_down },
{ "ChangeSetting", "sv", "", control_change_setting },
{ "ChangePlayback", "su", "", control_change_playback },
+ { "ChangeTrack", "a{sv}","", control_change_track },
{ NULL, NULL, NULL, NULL }
};
diff --git a/doc/control-api.txt b/doc/control-api.txt
index ca97544..c2fa0e9 100644
--- a/doc/control-api.txt
+++ b/doc/control-api.txt
@@ -68,6 +68,9 @@ Methods void Connect()
TrackNumber uint32
TrackDuration uint32 (in milliseconds)
+ When track is changed, all metadata information not
+ supplied is treat as absent.
+
void ChangeSetting(string setting, variant value)
Called to transmit Application Settings, CT Status
--
1.7.6
--
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