--- a
+++ b/src/mediaserver/cdplugins/spotify/libspotify/api.h
@@ -0,0 +1,3966 @@
+/*
+ * Copyright (c) 2006-2012 Spotify Ltd
+ *
+ * The terms of use for this and related files can be read in
+ * the associated LICENSE file, usually stored in share/doc/libspotify/LICENSE.
+ */
+
+/**
+ * @file api.h Public API for libspotify
+ *
+ * @note All input strings are expected to be in UTF-8
+ * @note All output strings are in UTF-8.
+ *
+ * @note All usernames are valid XMPP nodeprep identifiers:
+ * http://tools.ietf.org/html/rfc3920#appendix-A
+ * If you need to store user data, we strongly advise you
+ * to use the canonical form of the username.
+ */
+
+#ifndef PUBLIC_API_H
+#define PUBLIC_API_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef SP_CALLCONV
+#ifdef _WIN32
+#define SP_CALLCONV __stdcall
+#else
+#define SP_CALLCONV
+#endif
+#endif
+
+#ifndef SP_LIBEXPORT
+#ifdef _WIN32
+#define SP_LIBEXPORT(x) x __stdcall
+#else
+#define SP_LIBEXPORT(x) x
+#endif
+#endif
+
+/* Includes */
+#include <stddef.h>
+
+#ifdef _WIN32
+typedef unsigned __int64 sp_uint64;
+#else
+#include <stdint.h>
+typedef uint64_t sp_uint64;
+#endif
+
+/* General types */
+
+#if !defined(__cplusplus) && !defined(__bool_true_false_are_defined)
+typedef unsigned char bool;
+#endif
+
+typedef unsigned char byte;
+
+/**
+ * @defgroup types Spotify types & structs
+ *
+ * @{
+ */
+
+typedef struct sp_session sp_session; ///< Representation of a session
+typedef struct sp_track sp_track; ///< A track handle
+typedef struct sp_album sp_album; ///< An album handle
+typedef struct sp_artist sp_artist; ///< An artist handle
+typedef struct sp_artistbrowse sp_artistbrowse; ///< A handle to an artist browse result
+typedef struct sp_albumbrowse sp_albumbrowse; ///< A handle to an album browse result
+typedef struct sp_toplistbrowse sp_toplistbrowse; ///< A handle to a toplist browse result
+typedef struct sp_search sp_search; ///< A handle to a search result
+typedef struct sp_link sp_link; ///< A handle to the libspotify internal representation of a URI
+typedef struct sp_image sp_image; ///< A handle to an image
+typedef struct sp_user sp_user; ///< A handle to a user
+typedef struct sp_playlist sp_playlist; ///< A playlist handle
+typedef struct sp_playlistcontainer sp_playlistcontainer; ///< A playlist container (playlist containing other playlists) handle
+typedef struct sp_inbox sp_inbox; ///< Add to inbox request handle
+/** @} */
+
+/**
+ * @defgroup error Error Handling
+ *
+ * All functions in libspotify use the same set of error codes. Most of them return
+ * an error code, and let the result of the operation be stored in an out-parameter.
+ *
+ * @{
+ */
+
+/**
+ * Error codes returned by various functions
+ */
+typedef enum sp_error {
+ SP_ERROR_OK = 0, ///< No errors encountered
+ SP_ERROR_BAD_API_VERSION = 1, ///< The library version targeted does not match the one you claim you support
+ SP_ERROR_API_INITIALIZATION_FAILED = 2, ///< Initialization of library failed - are cache locations etc. valid?
+ SP_ERROR_TRACK_NOT_PLAYABLE = 3, ///< The track specified for playing cannot be played
+ SP_ERROR_BAD_APPLICATION_KEY = 5, ///< The application key is invalid
+ SP_ERROR_BAD_USERNAME_OR_PASSWORD = 6, ///< Login failed because of bad username and/or password
+ SP_ERROR_USER_BANNED = 7, ///< The specified username is banned
+ SP_ERROR_UNABLE_TO_CONTACT_SERVER = 8, ///< Cannot connect to the Spotify backend system
+ SP_ERROR_CLIENT_TOO_OLD = 9, ///< Client is too old, library will need to be updated
+ SP_ERROR_OTHER_PERMANENT = 10, ///< Some other error occurred, and it is permanent (e.g. trying to relogin will not help)
+ SP_ERROR_BAD_USER_AGENT = 11, ///< The user agent string is invalid or too long
+ SP_ERROR_MISSING_CALLBACK = 12, ///< No valid callback registered to handle events
+ SP_ERROR_INVALID_INDATA = 13, ///< Input data was either missing or invalid
+ SP_ERROR_INDEX_OUT_OF_RANGE = 14, ///< Index out of range
+ SP_ERROR_USER_NEEDS_PREMIUM = 15, ///< The specified user needs a premium account
+ SP_ERROR_OTHER_TRANSIENT = 16, ///< A transient error occurred.
+ SP_ERROR_IS_LOADING = 17, ///< The resource is currently loading
+ SP_ERROR_NO_STREAM_AVAILABLE = 18, ///< Could not find any suitable stream to play
+ SP_ERROR_PERMISSION_DENIED = 19, ///< Requested operation is not allowed
+ SP_ERROR_INBOX_IS_FULL = 20, ///< Target inbox is full
+ SP_ERROR_NO_CACHE = 21, ///< Cache is not enabled
+ SP_ERROR_NO_SUCH_USER = 22, ///< Requested user does not exist
+ SP_ERROR_NO_CREDENTIALS = 23, ///< No credentials are stored
+ SP_ERROR_NETWORK_DISABLED = 24, ///< Network disabled
+ SP_ERROR_INVALID_DEVICE_ID = 25, ///< Invalid device ID
+ SP_ERROR_CANT_OPEN_TRACE_FILE = 26, ///< Unable to open trace file
+ SP_ERROR_APPLICATION_BANNED = 27, ///< This application is no longer allowed to use the Spotify service
+ SP_ERROR_OFFLINE_TOO_MANY_TRACKS = 31, ///< Reached the device limit for number of tracks to download
+ SP_ERROR_OFFLINE_DISK_CACHE = 32, ///< Disk cache is full so no more tracks can be downloaded to offline mode
+ SP_ERROR_OFFLINE_EXPIRED = 33, ///< Offline key has expired, the user needs to go online again
+ SP_ERROR_OFFLINE_NOT_ALLOWED = 34, ///< This user is not allowed to use offline mode
+ SP_ERROR_OFFLINE_LICENSE_LOST = 35, ///< The license for this device has been lost. Most likely because the user used offline on three other device
+ SP_ERROR_OFFLINE_LICENSE_ERROR = 36, ///< The Spotify license server does not respond correctly
+ SP_ERROR_LASTFM_AUTH_ERROR = 39, ///< A LastFM scrobble authentication error has occurred
+ SP_ERROR_INVALID_ARGUMENT = 40, ///< An invalid argument was specified
+ SP_ERROR_SYSTEM_FAILURE = 41, ///< An operating system error
+} sp_error;
+
+/**
+ * Convert a numeric libspotify error code to a text string. The error message is in
+ * English. This function is useful for logging purposes.
+ *
+ * @param[in] error The error code to lookup
+ */
+SP_LIBEXPORT(const char*) sp_error_message(sp_error error);
+
+/** @} */
+
+
+
+/**
+ * @defgroup session Session handling
+ *
+ * The concept of a session is fundamental for all communication with the Spotify ecosystem - it is the
+ * object responsible for communicating with the Spotify service. You will need to instantiate a
+ * session that then can be used to request artist information, perform searches etc.
+ *
+ * @{
+ */
+
+/**
+ * Current version of the application interface, that is, the API described by this file.
+ *
+ * This value should be set in the sp_session_config struct passed to sp_session_create().
+ *
+ * If an (upgraded) library is no longer compatible with this version the error #SP_ERROR_BAD_API_VERSION will be
+ * returned from sp_session_create(). Future versions of the library will provide you with some kind of mechanism
+ * to request an updated version of the library.
+ */
+#define SPOTIFY_API_VERSION 12
+
+/**
+ * Describes the current state of the connection
+ */
+typedef enum sp_connectionstate {
+ SP_CONNECTION_STATE_LOGGED_OUT = 0, ///< User not yet logged in
+ SP_CONNECTION_STATE_LOGGED_IN = 1, ///< Logged in against a Spotify access point
+ SP_CONNECTION_STATE_DISCONNECTED = 2, ///< Was logged in, but has now been disconnected
+ SP_CONNECTION_STATE_UNDEFINED = 3, ///< The connection state is undefined
+ SP_CONNECTION_STATE_OFFLINE = 4 ///< Logged in in offline mode
+} sp_connectionstate;
+
+
+/**
+ * Sample type descriptor
+ */
+typedef enum sp_sampletype {
+ SP_SAMPLETYPE_INT16_NATIVE_ENDIAN = 0, ///< 16-bit signed integer samples
+} sp_sampletype;
+
+/**
+ * Audio format descriptor
+ */
+typedef struct sp_audioformat {
+ sp_sampletype sample_type; ///< Sample type enum,
+ int sample_rate; ///< Audio sample rate, in samples per second.
+ int channels; ///< Number of channels. Currently 1 or 2.
+} sp_audioformat;
+
+/**
+ * Bitrate definitions for music streaming
+ */
+typedef enum sp_bitrate {
+ SP_BITRATE_160k = 0, ///< Bitrate 160kbps
+ SP_BITRATE_320k = 1, ///< Bitrate 320kbps
+ SP_BITRATE_96k = 2, ///< Bitrate 96kbps
+} sp_bitrate;
+
+/**
+ * Playlist types
+ */
+typedef enum sp_playlist_type {
+ SP_PLAYLIST_TYPE_PLAYLIST = 0, ///< A normal playlist.
+ SP_PLAYLIST_TYPE_START_FOLDER = 1, ///< Marks a folder starting point,
+ SP_PLAYLIST_TYPE_END_FOLDER = 2, ///< and ending point.
+ SP_PLAYLIST_TYPE_PLACEHOLDER = 3, ///< Unknown entry.
+} sp_playlist_type;
+
+
+
+/**
+ * Search types
+ */
+typedef enum sp_search_type {
+ SP_SEARCH_STANDARD = 0,
+ SP_SEARCH_SUGGEST = 1,
+} sp_search_type;
+
+/**
+ * Playlist offline status
+ */
+typedef enum sp_playlist_offline_status {
+ SP_PLAYLIST_OFFLINE_STATUS_NO = 0, ///< Playlist is not offline enabled
+ SP_PLAYLIST_OFFLINE_STATUS_YES = 1, ///< Playlist is synchronized to local storage
+ SP_PLAYLIST_OFFLINE_STATUS_DOWNLOADING = 2, ///< This playlist is currently downloading. Only one playlist can be in this state any given time
+ SP_PLAYLIST_OFFLINE_STATUS_WAITING = 3, ///< Playlist is queued for download
+} sp_playlist_offline_status;
+
+/**
+ * Track availability
+ */
+typedef enum sp_availability {
+ SP_TRACK_AVAILABILITY_UNAVAILABLE = 0, ///< Track is not available
+ SP_TRACK_AVAILABILITY_AVAILABLE = 1, ///< Track is available and can be played
+ SP_TRACK_AVAILABILITY_NOT_STREAMABLE = 2, ///< Track can not be streamed using this account
+ SP_TRACK_AVAILABILITY_BANNED_BY_ARTIST = 3, ///< Track not available on artist's reqeust
+} sp_track_availability;
+
+/**
+ * Track offline status
+ */
+typedef enum sp_track_offline_status {
+ SP_TRACK_OFFLINE_NO = 0, ///< Not marked for offline
+ SP_TRACK_OFFLINE_WAITING = 1, ///< Waiting for download
+ SP_TRACK_OFFLINE_DOWNLOADING = 2, ///< Currently downloading
+ SP_TRACK_OFFLINE_DONE = 3, ///< Downloaded OK and can be played
+ SP_TRACK_OFFLINE_ERROR = 4, ///< Error during download
+ SP_TRACK_OFFLINE_DONE_EXPIRED = 5, ///< Downloaded OK but not playable due to expiery
+ SP_TRACK_OFFLINE_LIMIT_EXCEEDED = 6, ///< Waiting because device have reached max number of allowed tracks
+ SP_TRACK_OFFLINE_DONE_RESYNC = 7, ///< Downloaded OK and available but scheduled for re-download
+} sp_track_offline_status;
+
+/**
+ * Image size
+ */
+typedef enum sp_image_size {
+ SP_IMAGE_SIZE_NORMAL = 0, ///< Normal image size
+ SP_IMAGE_SIZE_SMALL = 1, ///< Small image size
+ SP_IMAGE_SIZE_LARGE = 2, ///< Large image size
+} sp_image_size;
+
+/**
+ * Buffer stats used by get_audio_buffer_stats callback
+ */
+typedef struct sp_audio_buffer_stats {
+ int samples; ///< Samples in buffer
+ int stutter; ///< Number of stutters (audio dropouts) since last query
+} sp_audio_buffer_stats;
+
+/**
+ * List of subscribers returned by sp_playlist_subscribers()
+ */
+typedef struct sp_subscribers {
+ unsigned int count; ///< Number of elements in 'subscribers'
+ char *subscribers[1]; ///< Actual size is 'count'. Array of pointers to canonical usernames
+} sp_subscribers;
+
+
+/**
+ * Current connection type set using sp_session_set_connection_type()
+ */
+typedef enum sp_connection_type {
+ SP_CONNECTION_TYPE_UNKNOWN = 0, ///< Connection type unknown (Default)
+ SP_CONNECTION_TYPE_NONE = 1, ///< No connection
+ SP_CONNECTION_TYPE_MOBILE = 2, ///< Mobile data (EDGE, 3G, etc)
+ SP_CONNECTION_TYPE_MOBILE_ROAMING = 3, ///< Roamed mobile data (EDGE, 3G, etc)
+ SP_CONNECTION_TYPE_WIFI = 4, ///< Wireless connection
+ SP_CONNECTION_TYPE_WIRED = 5, ///< Ethernet cable, etc
+} sp_connection_type;
+
+
+/**
+ * Connection rules, bitwise OR of flags
+ *
+ * The default is SP_CONNECTION_RULE_NETWORK | SP_CONNECTION_RULE_ALLOW_SYNC
+ */
+typedef enum sp_connection_rules {
+ SP_CONNECTION_RULE_NETWORK = 0x1, ///< Allow network traffic. When not set libspotify will force itself into offline mode
+ SP_CONNECTION_RULE_NETWORK_IF_ROAMING = 0x2, ///< Allow network traffic even if roaming
+ SP_CONNECTION_RULE_ALLOW_SYNC_OVER_MOBILE = 0x4, ///< Set to allow syncing of offline content over mobile connections
+ SP_CONNECTION_RULE_ALLOW_SYNC_OVER_WIFI = 0x8, ///< Set to allow syncing of offline content over WiFi
+} sp_connection_rules;
+
+
+/**
+ * Controls the type of data that will be included in artist browse queries
+ */
+typedef enum sp_artistbrowse_type {
+ SP_ARTISTBROWSE_FULL, /**< All information except tophit tracks
+ This mode is deprecated and will removed in a future release */
+ SP_ARTISTBROWSE_NO_TRACKS, /**< Only albums and data about them, no tracks.
+ In other words, sp_artistbrowse_num_tracks() will return 0
+ */
+ SP_ARTISTBROWSE_NO_ALBUMS, /**< Only return data about the artist (artist name, similar artist
+ biography, etc
+ No tracks or album will be abailable.
+ sp_artistbrowse_num_tracks() and sp_artistbrowse_num_albums()
+ will both return 0
+ */
+} sp_artistbrowse_type;
+
+typedef enum sp_social_provider {
+ SP_SOCIAL_PROVIDER_SPOTIFY,
+ SP_SOCIAL_PROVIDER_FACEBOOK,
+ SP_SOCIAL_PROVIDER_LASTFM,
+} sp_social_provider;
+
+typedef enum sp_scrobbling_state {
+ SP_SCROBBLING_STATE_USE_GLOBAL_SETTING = 0,
+ SP_SCROBBLING_STATE_LOCAL_ENABLED = 1,
+ SP_SCROBBLING_STATE_LOCAL_DISABLED = 2,
+ SP_SCROBBLING_STATE_GLOBAL_ENABLED = 3,
+ SP_SCROBBLING_STATE_GLOBAL_DISABLED = 4,
+} sp_scrobbling_state;
+
+
+/**
+ * Offline sync status
+ */
+typedef struct sp_offline_sync_status {
+ /**
+ * Queued tracks/bytes is things left to sync in current sync
+ * operation
+ */
+ int queued_tracks;
+ sp_uint64 queued_bytes;
+
+ /**
+ * Done tracks/bytes is things marked for sync that existed on
+ * device before current sync operation
+ */
+ int done_tracks;
+ sp_uint64 done_bytes;
+
+ /**
+ * Copied tracks/bytes is things that has been copied in
+ * current sync operation
+ */
+ int copied_tracks;
+ sp_uint64 copied_bytes;
+
+ /**
+ * Tracks that are marked as synced but will not be copied
+ * (for various reasons)
+ */
+ int willnotcopy_tracks;
+
+ /**
+ * A track is counted as error when something goes wrong while
+ * syncing the track
+ */
+ int error_tracks;
+
+ /**
+ * Set if sync operation is in progress
+ */
+ bool syncing;
+
+} sp_offline_sync_status;
+
+
+/**
+ * Session callbacks
+ *
+ * Registered when you create a session.
+ * If some callbacks should not be of interest, set them to NULL.
+ */
+typedef struct sp_session_callbacks {
+
+ /**
+ * Called when login has been processed and was successful
+ *
+ * @param[in] session Session
+ * @param[in] error One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ * SP_ERROR_CLIENT_TOO_OLD
+ * SP_ERROR_UNABLE_TO_CONTACT_SERVER
+ * SP_ERROR_BAD_USERNAME_OR_PASSWORD
+ * SP_ERROR_USER_BANNED
+ * SP_ERROR_USER_NEEDS_PREMIUM
+ * SP_ERROR_OTHER_TRANSIENT
+ * SP_ERROR_OTHER_PERMANENT
+ */
+ void (SP_CALLCONV *logged_in)(sp_session *session, sp_error error);
+
+ /**
+ * Called when logout has been processed. Either called explicitly
+ * if you initialize a logout operation, or implicitly if there
+ * is a permanent connection error
+ *
+ * @param[in] session Session
+ */
+ void (SP_CALLCONV *logged_out)(sp_session *session);
+ /**
+ * Called whenever metadata has been updated
+ *
+ * If you have metadata cached outside of libspotify, you should purge
+ * your caches and fetch new versions.
+ *
+ * @param[in] session Session
+ */
+ void (SP_CALLCONV *metadata_updated)(sp_session *session);
+
+ /**
+ * Called when there is a connection error, and the library has problems
+ * reconnecting to the Spotify service. Could be called multiple times (as
+ * long as the problem is present)
+ *
+ *
+ * @param[in] session Session
+ * @param[in] error One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ * SP_ERROR_CLIENT_TOO_OLD
+ * SP_ERROR_UNABLE_TO_CONTACT_SERVER
+ * SP_ERROR_BAD_USERNAME_OR_PASSWORD
+ * SP_ERROR_USER_BANNED
+ * SP_ERROR_USER_NEEDS_PREMIUM
+ * SP_ERROR_OTHER_TRANSIENT
+ * SP_ERROR_OTHER_PERMANENT
+ */
+ void (SP_CALLCONV *connection_error)(sp_session *session, sp_error error);
+
+ /**
+ * Called when the access point wants to display a message to the user
+ *
+ * In the desktop client, these are shown in a blueish toolbar just below the
+ * search box.
+ *
+ * @param[in] session Session
+ * @param[in] message String in UTF-8 format.
+ */
+ void (SP_CALLCONV *message_to_user)(sp_session *session, const char *message);
+
+ /**
+ * Called when processing needs to take place on the main thread.
+ *
+ * You need to call sp_session_process_events() in the main thread to get
+ * libspotify to do more work. Failure to do so may cause request timeouts,
+ * or a lost connection.
+ *
+ * @param[in] session Session
+ *
+ * @note This function is called from an internal session thread - you need to have proper synchronization!
+ */
+ void (SP_CALLCONV *notify_main_thread)(sp_session *session);
+
+ /**
+ * Called when there is decompressed audio data available.
+ *
+ * @param[in] session Session
+ * @param[in] format Audio format descriptor sp_audioformat
+ * @param[in] frames Points to raw PCM data as described by \p format
+ * @param[in] num_frames Number of available samples in \p frames.
+ * If this is 0, a discontinuity has occurred (such as after a seek). The application
+ * should flush its audio fifos, etc.
+ *
+ * @return Number of frames consumed.
+ * This value can be used to rate limit the output from the library if your
+ * output buffers are saturated. The library will retry delivery in about 100ms.
+ *
+ * @note This function is called from an internal session thread - you need to have proper synchronization!
+ *
+ * @note This function must never block. If your output buffers are full you must return 0 to signal
+ * that the library should retry delivery in a short while.
+ */
+ int (SP_CALLCONV *music_delivery)(sp_session *session, const sp_audioformat *format, const void *frames, int num_frames);
+
+ /**
+ * Music has been paused because an account only allows music
+ * to be played from one location simultaneously.
+ *
+ * @note When this callback is invoked the application should
+ * behave just as if the user pressed the pause
+ * button. The application should also display a message
+ * to the user indicating the playback has been paused
+ * because another application is playing using the same
+ * account.
+ *
+ * @note IT MUST NOT automatically resume playback but must
+ * instead wait for the user to press play.
+ *
+ * @param[in] session Session
+ */
+ void (SP_CALLCONV *play_token_lost)(sp_session *session);
+
+ /**
+ * Logging callback.
+ *
+ * @param[in] session Session
+ * @param[in] data Log data
+ */
+ void (SP_CALLCONV *log_message)(sp_session *session, const char *data);
+
+ /**
+ * End of track.
+ * Called when the currently played track has reached its end.
+ *
+ * @note This function is invoked from the main thread
+ *
+ * @param[in] session Session
+ */
+ void (SP_CALLCONV *end_of_track)(sp_session *session);
+
+ /**
+ * Streaming error.
+ * Called when streaming cannot start or continue.
+ *
+ * @note This function is invoked from the main thread
+ *
+ * @param[in] session Session
+ * @param[in] error One of the following errors, from ::sp_error
+ * SP_ERROR_NO_STREAM_AVAILABLE
+ * SP_ERROR_OTHER_TRANSIENT
+ * SP_ERROR_OTHER_PERMANENT
+ */
+ void (SP_CALLCONV *streaming_error)(sp_session *session, sp_error error);
+
+ /**
+ * Called after user info (anything related to sp_user objects) have been updated.
+ *
+ * @param[in] session Session
+ */
+ void (SP_CALLCONV *userinfo_updated)(sp_session *session);
+
+ /**
+ * Called when audio playback should start
+ *
+ * @note For this to work correctly the application must also implement get_audio_buffer_stats()
+ *
+ * @note This function is called from an internal session thread - you need to have proper synchronization!
+ *
+ * @note This function must never block.
+ *
+ * @param[in] session Session
+ */
+ void (SP_CALLCONV *start_playback)(sp_session *session);
+
+
+ /**
+ * Called when audio playback should stop
+ *
+ * @note For this to work correctly the application must also implement get_audio_buffer_stats()
+ *
+ * @note This function is called from an internal session thread - you need to have proper synchronization!
+ *
+ * @note This function must never block.
+ *
+ * @param[in] session Session
+ */
+ void (SP_CALLCONV *stop_playback)(sp_session *session);
+
+ /**
+ * Called to query application about its audio buffer
+ *
+ * @note This function is called from an internal session thread - you need to have proper synchronization!
+ *
+ * @note This function must never block.
+ *
+ * @param[in] session Session
+ * @param[out] stats Stats struct to be filled by application
+ */
+ void (SP_CALLCONV *get_audio_buffer_stats)(sp_session *session, sp_audio_buffer_stats *stats);
+
+ /**
+ * Called when offline synchronization status is updated
+ *
+ * @param[in] session Session
+ */
+ void (SP_CALLCONV *offline_status_updated)(sp_session *session);
+
+ /**
+ * Called when offline synchronization status is updated
+ *
+ * @param[in] session Session
+ * @param[in] error Offline error. Will be SP_ERROR_OK if the offline synchronization
+ * error state has cleared
+ */
+ void (SP_CALLCONV *offline_error)(sp_session *session, sp_error error);
+
+ /**
+ * Called when storable credentials have been updated, usually called when
+ * we have connected to the AP.
+ *
+ * @param[in] session Session
+ * @param[in] blob Blob is a null-terminated string which contains
+ * an encrypted token that can be stored safely on disk
+ * instead of storing plaintext passwords.
+ */
+ void (SP_CALLCONV *credentials_blob_updated)(sp_session *session, const char *blob);
+
+ /**
+ * Called when the connection state has updated - such as when logging in, going offline, etc.
+ *
+ * @param[in] session Session
+ */
+ void (SP_CALLCONV *connectionstate_updated)(sp_session *session);
+
+ /**
+ * Called when there is a scrobble error event
+ *
+ * @param[in] session Session
+ * @param[in] error Scrobble error. Currently SP_ERROR_LASTFM_AUTH_ERROR.
+ */
+ void (SP_CALLCONV *scrobble_error)(sp_session *session, sp_error error);
+
+ /**
+ * Called when there is a change in the private session mode
+ *
+ * @param[in] session Session
+ * @param[in] isPrivate True if in private session, false otherwhise
+ */
+ void (SP_CALLCONV *private_session_mode_changed)(sp_session *session, bool is_private);
+} sp_session_callbacks;
+
+/**
+ * Session config
+ */
+typedef struct sp_session_config {
+ int api_version; ///< The version of the Spotify API your application is compiled with. Set to #SPOTIFY_API_VERSION
+ const char *cache_location; /**< The location where Spotify will write cache files.
+ * This cache include tracks, cached browse results and coverarts.
+ * Set to empty string ("") to disable cache
+ */
+ const char *settings_location; /**< The location where Spotify will write setting files and per-user
+ * cache items. This includes playlists, track metadata, etc.
+ * 'settings_location' may be the same path as 'cache_location'.
+ * 'settings_location' folder will not be created (unlike 'cache_location'),
+ * if you don't want to create the folder yourself, you can set 'settings_location' to 'cache_location'.
+ */
+ const void *application_key; ///< Your application key
+ size_t application_key_size; ///< The size of the application key in bytes
+ const char *user_agent; /**< "User-Agent" for your application - max 255 characters long
+ The User-Agent should be a relevant, customer facing identification of your application
+ */
+
+ const sp_session_callbacks *callbacks; ///< Delivery callbacks for session events, or NULL if you are not interested in any callbacks (not recommended!)
+ void *userdata; ///< User supplied data for your application
+
+ /**
+ * Compress local copy of playlists, reduces disk space usage
+ */
+ bool compress_playlists;
+
+ /**
+ * Don't save metadata for local copies of playlists
+ * Reduces disk space usage at the expense of needing
+ * to request metadata from Spotify backend when loading list
+ */
+ bool dont_save_metadata_for_playlists;
+
+ /**
+ * Avoid loading playlists into RAM on startup.
+ * See sp_playlist_is_in_ram() for more details.
+ */
+ bool initially_unload_playlists;
+
+ /**
+ * Device ID for offline synchronization and logging purposes. The Device Id must be unique to the particular device instance,
+ * i.e. no two units must supply the same Device ID. The Device ID must not change between sessions or power cycles.
+ * Good examples is the device's MAC address or unique serial number.
+ */
+ const char *device_id;
+
+ /**
+ * Url to the proxy server that should be used.
+ * The format is protocol://<host>:port (where protocal is http/https/socks4/socks5)
+ */
+ const char *proxy;
+ /**
+ * Username to authenticate with proxy server
+ */
+ const char *proxy_username;
+ /**
+ * Password to authenticate with proxy server
+ */
+ const char *proxy_password;
+
+ /**
+ * Path to a file containing the root ca certificates that the peer should be verified with.
+ * The file must be a concatenation of all certificates in PEM format. Provided with libspotify
+ * is a sample pem file in examples. It is recommended that the application export a similar file from
+ * the local certificate store.
+ */
+ const char *ca_certs_filename;
+
+ /**
+ * Path to API trace file
+ */
+ const char *tracefile;
+
+} sp_session_config;
+
+/**
+ * Initialize a session. The session returned will be initialized, but you will need
+ * to log in before you can perform any other operation
+ * Currently it is not supported to have multiple active sessions, and it's recommended to only call this once per process.
+ *
+ * Here is a snippet from \c spshell.c:
+ * @dontinclude spshell.c
+ * @skip config.api_version
+ * @until }
+ *
+ * @param[in] config The configuration to use for the session
+ * @param[out] sess If successful, a new session - otherwise NULL
+ *
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ * SP_ERROR_BAD_API_VERSION
+ * SP_ERROR_BAD_USER_AGENT
+ * SP_ERROR_BAD_APPLICATION_KEY
+ * SP_ERROR_API_INITIALIZATION_FAILED
+ * SP_ERROR_INVALID_DEVICE_ID
+ */
+SP_LIBEXPORT(sp_error) sp_session_create(const sp_session_config *config, sp_session **sess);
+
+/**
+ * Release the session. This will clean up all data and connections associated with the session
+ *
+ * @param[in] sess Session object returned from sp_session_create()
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_session_release(sp_session *sess);
+
+
+/**
+ * Logs in the specified username/password combo. This initiates the login in the background.
+ * A callback is called when login is complete
+ *
+ * An application MUST NEVER store the user's password in clear text.
+ * If automatic relogin is required, use sp_session_relogin()
+ *
+ * Here is a snippet from \c spshell.c:
+ * @dontinclude spshell.c
+ * @skip sp_session_login
+ * @until }
+ *
+ * @param[in] session Your session object
+ * @param[in] username The username to log in
+ * @param[in] password The password for the specified username
+ * @param[in] remember_me If set, the username / password will be remembered by libspotify
+ * @param[in] blob If you have received a blob in the #credentials_blob_updated
+ * you can pas this here instead of password
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_session_login(sp_session *session, const char *username, const char *password, bool remember_me, const char *blob);
+
+
+/**
+ * Log in the remembered user if last user that logged in logged in with remember_me set.
+ * If no credentials are stored, this will return SP_ERROR_NO_CREDENTIALS.
+ *
+ * @param[in] session Your session object
+ *
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ * SP_ERROR_NO_CREDENTIALS
+ */
+SP_LIBEXPORT(sp_error) sp_session_relogin(sp_session *session);
+
+
+/**
+ * Get username of the user that will be logged in via sp_session_relogin()
+ *
+ * @param[in] session Your session object
+ * @param[out] buffer The buffer to hold the username
+ * @param[in] buffer_size The max size of the buffer that will hold the username.
+ * The resulting string is guaranteed to always be null terminated if
+ * buffer_size > 0
+ *
+ * @return The number of characters in the username.
+ * If value is greater or equal than \p buffer_size, output was truncated.
+ * If returned value is -1 no credentials are stored in libspotify.
+ */
+SP_LIBEXPORT(int) sp_session_remembered_user(sp_session *session, char *buffer, size_t buffer_size);
+
+
+/**
+ * Get a pointer to a string representing the user's login username.
+ *
+ * @param[in] session Your session object
+ *
+ * @return A string representing the login username.
+ */
+SP_LIBEXPORT(const char *) sp_session_user_name(sp_session *session);
+
+
+/**
+ * Remove stored credentials in libspotify. If no credentials are currently stored, nothing will happen.
+ *
+ * @param[in] session Your session object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_session_forget_me(sp_session *session);
+
+
+/**
+ * Fetches the currently logged in user
+ *
+ * @param[in] session Your session object
+ *
+ * @return The logged in user (or NULL if not logged in)
+ */
+SP_LIBEXPORT(sp_user *) sp_session_user(sp_session *session);
+
+/**
+ * Logs out the currently logged in user
+ *
+ * Always call this before terminating the application and libspotify is currently
+ * logged in. Otherwise, the settings and cache may be lost.
+ *
+ * @param[in] session Your session object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_session_logout(sp_session *session);
+
+
+/**
+ * Flush the caches
+ *
+ * This will make libspotify write all data that is meant to be stored
+ * on disk to the disk immediately. libspotify does this periodically
+ * by itself and also on logout. So under normal conditions this
+ * should never need to be used.
+ *
+ * @param[in] session Your session object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_session_flush_caches(sp_session *session);
+
+/**
+ * The connection state of the specified session.
+ *
+ * @param[in] session Your session object
+ *
+ * @return The connection state - see the sp_connectionstate enum for possible values
+ */
+SP_LIBEXPORT(sp_connectionstate) sp_session_connectionstate(sp_session *session);
+
+/**
+ * The userdata associated with the session
+ *
+ * @param[in] session Your session object
+ *
+ * @return The userdata that was passed in on session creation
+ */
+SP_LIBEXPORT(void *) sp_session_userdata(sp_session *session);
+
+/**
+ * Set maximum cache size.
+ *
+ * @param[in] session Your session object
+ * @param[in] size Maximum cache size in megabytes.
+ * Setting it to 0 (the default) will let libspotify automatically
+ * resize the cache (10% of disk free space)
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_session_set_cache_size(sp_session *session, size_t size);
+
+/**
+ * Make the specified session process any pending events
+ *
+ * @param[in] session Your session object
+ * @param[out] next_timeout Stores the time (in milliseconds) until you should call this function again
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_session_process_events(sp_session *session, int *next_timeout);
+
+/**
+ * Loads the specified track
+ *
+ * After successfully loading the track, you have the option of running
+ * sp_session_player_play() directly, or using sp_session_player_seek() first.
+ * When this call returns, the track will have been loaded, unless an error occurred.
+ *
+ * @param[in] session Your session object
+ * @param[in] track The track to be loaded
+ *
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ * SP_ERROR_MISSING_CALLBACK
+ * SP_ERROR_TRACK_NOT_PLAYABLE
+ *
+ */
+SP_LIBEXPORT(sp_error) sp_session_player_load(sp_session *session, sp_track *track);
+
+/**
+ * Seek to position in the currently loaded track
+ *
+ * @param[in] session Your session object
+ * @param[in] offset Track position, in milliseconds.
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_session_player_seek(sp_session *session, int offset);
+
+/**
+ * Play or pause the currently loaded track
+ *
+ * @param[in] session Your session object
+ * @param[in] play If set to true, playback will occur. If set to false, the playback will be paused.
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_session_player_play(sp_session *session, bool play);
+
+/**
+ * Stops the currently playing track
+ *
+ * This frees some resources held by libspotify to identify the currently
+ * playing track.
+ *
+ * @param[in] session Your session object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_session_player_unload(sp_session *session);
+
+/**
+ * Prefetch a track
+ *
+ * Instruct libspotify to start loading of a track into its cache.
+ * This could be done by an application just before the current track ends.
+ *
+ * @param[in] session Your session object
+ * @param[in] track The track to be prefetched
+ *
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_NO_CACHE
+ * SP_ERROR_OK
+ *
+ * @note Prefetching is only possible if a cache is configured
+ *
+ */
+SP_LIBEXPORT(sp_error) sp_session_player_prefetch(sp_session *session, sp_track *track);
+
+/**
+ * Returns the playlist container for the currently logged in user.
+ *
+ * @param[in] session Your session object
+ *
+ * @return Playlist container object, NULL if not logged in
+ */
+SP_LIBEXPORT(sp_playlistcontainer *) sp_session_playlistcontainer(sp_session *session);
+
+/**
+ * Returns an inbox playlist for the currently logged in user
+ *
+ * @param[in] session Session object
+ *
+ * @return A playlist or NULL if no user is logged in
+ * @note You need to release the playlist when you are done with it.
+ * @see sp_playlist_release()
+ */
+SP_LIBEXPORT(sp_playlist *) sp_session_inbox_create(sp_session *session);
+
+/**
+ * Returns the starred list for the current user
+ *
+ * @param[in] session Session object
+ *
+ * @return A playlist or NULL if no user is logged in
+ * @note You need to release the playlist when you are done with it.
+ * @see sp_playlist_release()
+ */
+SP_LIBEXPORT(sp_playlist *) sp_session_starred_create(sp_session *session);
+
+/**
+ * Returns the starred list for a user
+ *
+ * @param[in] session Session object
+ * @param[in] canonical_username Canonical username
+ *
+ * @return A playlist or NULL if no user is logged in
+ * @note You need to release the playlist when you are done with it.
+ * @see sp_playlist_release()
+ */
+SP_LIBEXPORT(sp_playlist *) sp_session_starred_for_user_create(sp_session *session, const char *canonical_username);
+
+/**
+ * Return the published container for a given @a canonical_username,
+ * or the currently logged in user if @a canonical_username is NULL.
+ *
+ * When done with the list you should call sp_playlistconatiner_release() to
+ * decrese the reference you own by having created it.
+ *
+ * @param[in] session Your session object.
+ * @param[in] canonical_username The canonical username, or NULL.
+ *
+ * @return Playlist container object, NULL if not logged in.
+ */
+SP_LIBEXPORT(sp_playlistcontainer *) sp_session_publishedcontainer_for_user_create(sp_session *session, const char *canonical_username);
+
+
+/**
+ * Set preferred bitrate for music streaming
+ *
+ * @param[in] session Session object
+ * @param[in] bitrate Preferred bitrate, see ::sp_bitrate for possible values
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ * SP_ERROR_INVALID_ARGUMENT
+ */
+SP_LIBEXPORT(sp_error) sp_session_preferred_bitrate(sp_session *session, sp_bitrate bitrate);
+
+
+/**
+ * Set preferred bitrate for offline sync
+ *
+ * @param[in] session Session object
+ * @param[in] bitrate Preferred bitrate, see ::sp_bitrate for possible values
+ * @param[in] allow_resync Set to true if libspotify should resynchronize already synchronized tracks. Usually you should set this to false.
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ * SP_ERROR_INVALID_ARGUMENT
+ */
+SP_LIBEXPORT(sp_error) sp_session_preferred_offline_bitrate(sp_session *session, sp_bitrate bitrate, bool allow_resync);
+
+
+/**
+ * Return status of volume normalization
+ *
+ * @param[in] session Session object
+ *
+ * @return true iff volume normalization is enabled
+ *
+ */
+SP_LIBEXPORT(bool) sp_session_get_volume_normalization(sp_session *session);
+
+
+/**
+ * Set volume normalization
+ *
+ * @param[in] session Session object
+ * @param[in] on True iff volume normalization should be enabled
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_session_set_volume_normalization(sp_session *session, bool on);
+
+
+/**
+ * Set if private session is enabled. This disables sharing what the user is listening to
+ * to services such as Spotify Social, Facebook and LastFM. The private session will
+ * last for a time, and then libspotify will revert to the normal state. The private
+ * session is prolonged by user activity.
+ *
+ * @param[in] session Session object
+ * @param[in] enabled True iff private session should be enabled
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_session_set_private_session(sp_session *session, bool enabled);
+
+/**
+ * Return True if private session is enabled
+ *
+ * @param[in] session Session object
+ *
+ * @return True if private session is enabled
+ */
+SP_LIBEXPORT(bool) sp_session_is_private_session(sp_session *session);
+
+/**
+ * Set if scrobbling is enabled. This api allows setting local overrides of the global scrobbling settings.
+ * Changing the global settings are currently not supported.
+ *
+ * @param[in] session Session object
+ * @param[in] provider The scrobbling provider referred to
+ * @param[in] state The state to set the provider to
+ *
+ * @return error code
+ *
+ * @see sp_social_provider
+ * @see sp_scrobbling_state
+ */
+SP_LIBEXPORT(sp_error) sp_session_set_scrobbling(sp_session *session, sp_social_provider provider, sp_scrobbling_state state);
+
+/**
+ * Return the scrobbling state. This makes it possible to find out if scrobbling is locally overrided or
+ * if the global setting is used.
+ *
+ * @param[in] session Session object
+ * @param[in] provider The scrobbling provider referred to
+ * @param[out] state The output variable receiving the sp_scrobbling_state state
+ *
+ * @return error code
+ */
+SP_LIBEXPORT(sp_error) sp_session_is_scrobbling(sp_session *session, sp_social_provider provider, sp_scrobbling_state* state);
+
+/**
+ * Return True if scrobbling settings should be shown to the user. Currently this setting is relevant
+ * only to the facebook provider.
+ * The returned value may be false if the user is not connected to facebook,
+ * or if the user has opted out from facebook social graph.
+ *
+ * @param[in] session Session object
+ * @param[in] provider The scrobbling provider referred to
+ * @param[out] out True iff scrobbling is possible
+ *
+ * @return error code
+ */
+ SP_LIBEXPORT(sp_error) sp_session_is_scrobbling_possible(sp_session *session, sp_social_provider provider, bool* out);
+
+/**
+ * Set the user's credentials with a social provider.
+ * Currently this is only relevant for LastFm
+ * Call sp_session_set_scrobbling to force an authentication attempt
+ * with the LastFm server. If authentication fails a scrobble_error callback will be
+ * sent.
+ *
+ * @param[in] session Session object
+ * @param[in] provider The scrobbling provider referred to
+ * @param[in] username The user name
+ * @param[in] password The password
+ *
+ * @return error code
+
+ * @see sp_session_set_scrobbling
+ * @see sp_session_callbacks#scrobble_error
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_session_set_social_credentials(sp_session *session, sp_social_provider provider, const char* username, const char* password);
+
+/**
+ * Set to true if the connection is currently routed over a roamed connectivity
+ *
+ * @param[in] session Session object
+ * @param[in] type Connection type
+ *
+ * @note Used in conjunction with sp_session_set_connection_rules() to control
+ * how libspotify should behave in respect to network activity and offline
+ * synchronization.
+ * @see sp_connection_type
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_session_set_connection_type(sp_session *session, sp_connection_type type);
+
+
+/**
+ * Set rules for how libspotify connects to Spotify servers and synchronizes offline content
+ *
+ * @param[in] session Session object
+ * @param[in] rules Connection rules
+ *
+ * @note Used in conjunction with sp_session_set_connection_type() to control
+ * how libspotify should behave in respect to network activity and offline
+ * synchronization.
+ * @see sp_connection_rules
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_session_set_connection_rules(sp_session *session, sp_connection_rules rules);
+
+
+
+/**
+ * Get total number of tracks that needs download before everything
+ * from all playlists that is marked for offline is fully synchronized
+ *
+ * @param[in] session Session object
+ *
+ * @return Number of tracks
+ */
+SP_LIBEXPORT(int) sp_offline_tracks_to_sync(sp_session *session);
+
+/**
+ * Return number of playlisys that is marked for offline synchronization
+ *
+ * @param[in] session Session object
+ *
+ * @return Number of playlists
+ */
+SP_LIBEXPORT(int) sp_offline_num_playlists(sp_session *session);
+
+/**
+ * Return offline synchronization status. When the internal status is
+ * updated the offline_status_updated() callback will be invoked.
+ *
+ * @param[in] session Session object
+ * @param[out] status Status object that will be filled with info
+ *
+ * @return false if no synching is in progress (in which case the contents
+ * of status is undefined)
+ *
+ */
+SP_LIBEXPORT(bool) sp_offline_sync_get_status(sp_session *session, sp_offline_sync_status *status);
+
+/**
+ * Return remaining time (in seconds) until the offline key store expires
+ * and the user is required to relogin
+ *
+ * @param[in] session Session object
+ * @return Seconds until expiration
+ *
+ */
+SP_LIBEXPORT(int) sp_offline_time_left(sp_session *session);
+
+/**
+ * Get currently logged in users country
+ * updated the offline_status_updated() callback will be invoked.
+ *
+ * @param[in] session Session object
+ *
+ * @return Country encoded in an integer 'SE' = 'S' << 8 | 'E'
+ */
+SP_LIBEXPORT(int) sp_session_user_country(sp_session *session);
+
+
+/** @} */
+
+
+/**
+ * @defgroup link Links (Spotify URIs)
+ *
+ * These functions handle links to Spotify entities in a way that allows you to
+ * not care about the textual representation of the link.
+ * @{
+ */
+
+/**
+ * Link types
+ */
+typedef enum {
+ SP_LINKTYPE_INVALID = 0, ///< Link type not valid - default until the library has parsed the link, or when parsing failed
+ SP_LINKTYPE_TRACK = 1, ///< Link type is track
+ SP_LINKTYPE_ALBUM = 2, ///< Link type is album
+ SP_LINKTYPE_ARTIST = 3, ///< Link type is artist
+ SP_LINKTYPE_SEARCH = 4, ///< Link type is search
+ SP_LINKTYPE_PLAYLIST = 5, ///< Link type is playlist
+ SP_LINKTYPE_PROFILE = 6, ///< Link type is profile
+ SP_LINKTYPE_STARRED = 7, ///< Link type is starred
+ SP_LINKTYPE_LOCALTRACK = 8, ///< Link type is a local file
+ SP_LINKTYPE_IMAGE = 9, ///< Link type is an image
+} sp_linktype;
+
+/**
+ * Create a Spotify link given a string
+ *
+ * @param[in] link A string representation of a Spotify link
+ *
+ * @return A link representation of the given string representation.
+ * If the link could not be parsed, this function returns NULL.
+ *
+ * @note You need to release the link when you are done with it.
+ * @see sp_link_type()
+ * @see sp_link_release()
+ */
+SP_LIBEXPORT(sp_link *) sp_link_create_from_string(const char *link);
+
+/**
+ * Generates a link object from a track
+ *
+ * @param[in] track A track object
+ * @param[in] offset Offset in track in ms.
+ *
+ * @return A link representing the track
+ *
+ * @note You need to release the link when you are done with it.
+ * @see sp_link_release()
+ */
+SP_LIBEXPORT(sp_link *) sp_link_create_from_track(sp_track *track, int offset);
+
+/**
+ * Create a link object from an album
+ *
+ * @param[in] album An album object
+ *
+ * @return A link representing the album
+ *
+ * @note You need to release the link when you are done with it.
+ * @see sp_link_release()
+ */
+SP_LIBEXPORT(sp_link *) sp_link_create_from_album(sp_album *album);
+
+/**
+ * Create an image link object from an album
+ *
+ * @param[in] album An album object
+ * @param[in] size The desired size of the image
+ *
+ * @return A link representing the album cover. Type is set to SP_LINKTYPE_IMAGE
+ *
+ * @note You need to release the link when you are done with it.
+ * @see sp_link_release()
+ */
+SP_LIBEXPORT(sp_link *) sp_link_create_from_album_cover(sp_album *album, sp_image_size size);
+
+/**
+ * Creates a link object from an artist
+ *
+ * @param[in] artist An artist object
+ *
+ * @return A link object representing the artist
+ *
+ * @note You need to release the link when you are done with it.
+ * @see sp_link_release()
+ */
+SP_LIBEXPORT(sp_link *) sp_link_create_from_artist(sp_artist *artist);
+
+/**
+ * Creates a link object pointing to an artist portrait
+ *
+ * @param[in] artist Artist browse object
+ * @param[in] size The desired size of the image
+ *
+ * @return A link object representing an image
+ *
+ * @note You need to release the link when you are done with it.
+ * @see sp_link_release()
+ * @see sp_artistbrowse_num_portraits()
+ */
+SP_LIBEXPORT(sp_link *) sp_link_create_from_artist_portrait(sp_artist *artist, sp_image_size size);
+
+
+/**
+ * Creates a link object from an artist portrait
+ *
+ * @param[in] arb Artist browse object
+ * @param[in] index The index of the portrait. Should be in the interval [0, sp_artistbrowse_num_portraits() - 1]
+ *
+ * @return A link object representing an image
+ *
+ * @note You need to release the link when you are done with it.
+ * @see sp_link_release()
+ * @see sp_artistbrowse_num_portraits()
+ *
+ * @note The difference from sp_link_create_from_artist_portrait() is
+ * that the artist browse object may contain multiple portraits.
+ *
+ */
+SP_LIBEXPORT(sp_link *) sp_link_create_from_artistbrowse_portrait(sp_artistbrowse *arb, int index);
+
+
+/**
+ * Generate a link object representing the current search
+ *
+ * @param[in] search Search object
+ *
+ * @return A link representing the search
+ *
+ * @note You need to release the link when you are done with it.
+ * @see sp_link_release()
+ */
+SP_LIBEXPORT(sp_link *) sp_link_create_from_search(sp_search *search);
+
+/**
+ * Create a link object representing the given playlist
+ *
+ * @param[in] playlist Playlist object
+ *
+ * @return A link representing the playlist
+ *
+ * @note You need to release the link when you are done with it.
+ * @see sp_link_release()
+ *
+ * @note Due to reasons in the playlist backend design and the Spotify URI
+ * scheme you need to wait for the playlist to be loaded before you can
+ * successfully construct an URI. If sp_link_create_from_playlist() returns
+ * NULL, try again after teh playlist_state_changed callback has fired.
+ */
+SP_LIBEXPORT(sp_link *) sp_link_create_from_playlist(sp_playlist *playlist);
+
+/**
+ * Create a link object representing the given playlist
+ *
+ * @param[in] user User object
+ *
+ * @return A link representing the profile.
+ *
+ * @note You need to release the link when you are done with it.
+ * @see sp_link_release()
+ */
+SP_LIBEXPORT(sp_link *) sp_link_create_from_user(sp_user *user);
+
+/**
+ * Create a link object representing the given image
+ *
+ * @param[in] image Image object
+ *
+ * @return A link representing the image.
+ *
+ * @note You need to release the link when you are done with it.
+ * @see sp_link_release()
+ */
+SP_LIBEXPORT(sp_link *) sp_link_create_from_image(sp_image *image);
+
+/**
+ * Create a string representation of the given Spotify link
+ *
+ * @param[in] link The Spotify link whose string representation you are interested in
+ * @param[out] buffer The buffer to hold the string representation of link
+ * @param[in] buffer_size The max size of the buffer that will hold the string representation
+ * The resulting string is guaranteed to always be null terminated if
+ * buffer_size > 0
+ *
+ * @return The number of characters in the string representation of the link. If this
+ * value is greater or equal than \p buffer_size, output was truncated.
+ */
+SP_LIBEXPORT(int) sp_link_as_string(sp_link *link, char *buffer, int buffer_size);
+
+/**
+ * The link type of the specified link
+ *
+ * @param[in] link The Spotify link whose type you are interested in
+ *
+ * @return The link type of the specified link - see the sp_linktype enum for possible values
+ */
+SP_LIBEXPORT(sp_linktype) sp_link_type(sp_link *link);
+
+/**
+ * The track representation for the given link
+ *
+ * @param[in] link The Spotify link whose track you are interested in
+ *
+ * @return The track representation of the given track link
+ * If the link is not of track type then NULL is returned.
+ */
+SP_LIBEXPORT(sp_track *) sp_link_as_track(sp_link *link);
+
+/**
+ * The track and offset into track representation for the given link
+ *
+ * @param[in] link The Spotify link whose track you are interested in
+ * @param[out] offset Pointer to offset into track (in milliseconds). If the link
+ * does not contain an offset this will be set to 0.
+ *
+ * @return The track representation of the given track link
+ * If the link is not of track type then NULL is returned.
+ */
+SP_LIBEXPORT(sp_track *) sp_link_as_track_and_offset(sp_link *link, int *offset);
+
+/**
+ * The album representation for the given link
+ *
+ * @param[in] link The Spotify link whose album you are interested in
+ *
+ * @return The album representation of the given album link
+ * If the link is not of album type then NULL is returned
+ */
+SP_LIBEXPORT(sp_album *) sp_link_as_album(sp_link *link);
+
+/**
+ * The artist representation for the given link
+ *
+ * @param[in] link The Spotify link whose artist you are interested in
+ *
+ * @return The artist representation of the given link
+ * If the link is not of artist type then NULL is returned
+ */
+SP_LIBEXPORT(sp_artist *) sp_link_as_artist(sp_link *link);
+
+
+/**
+ * The user representation for the given link
+ *
+ * @param[in] link The Spotify link whose user you are interested in
+ *
+ * @return The user representation of the given link
+ * If the link is not of user type then NULL is returned
+ */
+SP_LIBEXPORT(sp_user *) sp_link_as_user(sp_link *link);
+
+
+/**
+ * Increase the reference count of a link
+ *
+ * @param[in] link The link object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_link_add_ref(sp_link *link);
+
+/**
+ * Decrease the reference count of a link
+ *
+ * @param[in] link The link object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_link_release(sp_link *link);
+
+/** @} */
+
+
+
+/**
+ * @defgroup track Track subsystem
+ * @{
+ */
+
+/**
+ * Return whether or not the track metadata is loaded.
+ *
+ * @param[in] track The track
+ *
+ * @return True if track is loaded
+ *
+ * @note This is equivalent to checking if sp_track_error() not returns SP_ERROR_IS_LOADING.
+ */
+SP_LIBEXPORT(bool) sp_track_is_loaded(sp_track *track);
+
+/**
+ * Return an error code associated with a track. For example if it could not load
+ *
+ * @param[in] track The track
+ *
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ * SP_ERROR_IS_LOADING
+ * SP_ERROR_OTHER_PERMANENT
+ */
+SP_LIBEXPORT(sp_error) sp_track_error(sp_track *track);
+
+
+/**
+ * Return offline status for a track. sp_session_callbacks::metadata_updated() will be invoked when
+ * offline status of a track changes
+ *
+ * @param[in] track The track
+ *
+ * @return Stats as described by ::sp_track_offline_status
+ *
+ */
+SP_LIBEXPORT(sp_track_offline_status) sp_track_offline_get_status(sp_track *track);
+
+/**
+ * Return availability for a track
+ *
+ * @param[in] session Session
+ * @param[in] track The track
+ *
+ * @return Availability status, see ::sp_track_availability
+ *
+ * @note The track must be loaded or this function will always SP_TRACK_AVAILABILITY_UNAVAILABLE
+ * @see sp_track_is_loaded()
+ */
+SP_LIBEXPORT(sp_track_availability) sp_track_get_availability(sp_session *session, sp_track *track);
+
+/**
+ * Return true if the track is a local file.
+ *
+ * @param[in] session Session
+ * @param[in] track The track
+ *
+ * @return True if track is a local file.
+ *
+ * @note The track must be loaded or this function will always return false.
+ * @see sp_track_is_loaded()
+ */
+SP_LIBEXPORT(bool) sp_track_is_local(sp_session *session, sp_track *track);
+
+/**
+ * Return true if the track is autolinked to another track.
+ *
+ * @param[in] session Session
+ * @param[in] track The track
+ *
+ * @return True if track is autolinked.
+ *
+ * @note The track must be loaded or this function will always return false.
+ * @see sp_track_is_loaded()
+ */
+SP_LIBEXPORT(bool) sp_track_is_autolinked(sp_session *session, sp_track *track);
+
+
+/**
+ * Return the actual track that will be played if the given track is played
+ *
+ * @param[in] session Session
+ * @param[in] track The track
+ *
+ * @return A track
+ *
+ */
+SP_LIBEXPORT(sp_track *) sp_track_get_playable(sp_session *session, sp_track *track);
+
+/**
+ * Return true if the track is a placeholder. Placeholder tracks are used
+ * to store other objects than tracks in the playlist. Currently this is
+ * used in the inbox to store artists, albums and playlists.
+ *
+ * Use sp_link_create_from_track() to get a link object that points
+ * to the real object this "track" points to.
+ *
+ * @param[in] track The track
+ *
+ * @return True if track is a placeholder
+ *
+ * @note Contrary to most functions the track does not have to be
+ * loaded for this function to return correct value
+ */
+SP_LIBEXPORT(bool) sp_track_is_placeholder(sp_track *track);
+
+
+/**
+ * Return true if the track is starred by the currently logged in user.
+ *
+ * @param[in] session Session
+ * @param[in] track The track
+ *
+ * @return True if track is starred.
+ *
+ * @note The track must be loaded or this function will always return false.
+ * @see sp_track_is_loaded()
+ */
+SP_LIBEXPORT(bool) sp_track_is_starred(sp_session *session, sp_track *track);
+
+/**
+ * Star/Unstar the specified track
+ *
+ * @param[in] session Session
+ * @param[in] tracks Array of pointer to tracks.
+ * @param[in] num_tracks Length of \p tracks array
+ * @param[in] star Starred status of the track
+ *
+ * @note This will fail silently if playlists are disabled.
+ * @see sp_set_playlists_enabled()
+ */
+SP_LIBEXPORT(sp_error) sp_track_set_starred(sp_session *session, sp_track *const*tracks, int num_tracks, bool star);
+
+/**
+ * The number of artists performing on the specified track
+ *
+ * @param[in] track The track whose number of participating artists you are interested in
+ *
+ * @return The number of artists performing on the specified track.
+ * If no metadata is available for the track yet, this function returns 0.
+ */
+SP_LIBEXPORT(int) sp_track_num_artists(sp_track *track);
+
+/**
+ * The artist matching the specified index performing on the current track.
+ *
+ * @param[in] track The track whose participating artist you are interested in
+ * @param[in] index The index for the participating artist. Should be in the interval [0, sp_track_num_artists() - 1]
+ *
+ * @return The participating artist, or NULL if invalid index
+ */
+SP_LIBEXPORT(sp_artist *) sp_track_artist(sp_track *track, int index);
+
+/**
+ * The album of the specified track
+ *
+ * @param[in] track A track object
+ *
+ * @return The album of the given track. You need to increase the refcount
+ * if you want to keep the pointer around.
+ * If no metadata is available for the track yet, this function returns 0.
+ */
+SP_LIBEXPORT(sp_album *) sp_track_album(sp_track *track);
+
+/**
+ * The string representation of the specified track's name
+ *
+ * @param[in] track A track object
+ *
+ * @return The string representation of the specified track's name.
+ * Returned string is valid as long as the album object stays allocated
+ * and no longer than the next call to sp_session_process_events()
+ * If no metadata is available for the track yet, this function returns empty string.
+ */
+SP_LIBEXPORT(const char *) sp_track_name(sp_track *track);
+
+/**
+ * The duration, in milliseconds, of the specified track
+ *
+ * @param[in] track A track object
+ *
+ * @return The duration of the specified track, in milliseconds
+ * If no metadata is available for the track yet, this function returns 0.
+ */
+SP_LIBEXPORT(int) sp_track_duration(sp_track *track);
+
+/**
+ * Returns popularity for track
+ *
+ * @param[in] track A track object
+ *
+ * @return Popularity in range 0 to 100, 0 if undefined.
+ * If no metadata is available for the track yet, this function returns 0.
+ */
+SP_LIBEXPORT(int) sp_track_popularity(sp_track *track);
+
+/**
+ * Returns the disc number for a track
+ *
+ * @param[in] track A track object
+ *
+ * @return Disc index. Possible values are [1, total number of discs on album]
+ * This function returns valid data only for tracks appearing in a browse
+ * artist or browse album result (otherwise returns 0).
+ */
+SP_LIBEXPORT(int) sp_track_disc(sp_track *track);
+
+/**
+ * Returns the position of a track on its disc
+ *
+ * @param[in] track A track object
+ *
+ * @return Track position, starts at 1 (relative the corresponding disc)
+ * This function returns valid data only for tracks appearing in a browse
+ * artist or browse album result (otherwise returns 0).
+ */
+SP_LIBEXPORT(int) sp_track_index(sp_track *track);
+
+/**
+ * Returns the newly created local track
+ *
+ * @param[in] artist Name of the artist
+ * @param[in] title Song title
+ * @param[in] album Name of the album, or an empty string if not available
+ * @param[in] length Length in MS, or -1 if not available.
+ *
+ * @return A track.
+ */
+SP_LIBEXPORT(sp_track *) sp_localtrack_create(const char *artist, const char *title, const char *album, int length);
+
+/**
+ * Increase the reference count of a track
+ *
+ * @param[in] track The track object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_track_add_ref(sp_track *track);
+
+/**
+ * Decrease the reference count of a track
+ *
+ * @param[in] track The track object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_track_release(sp_track *track);
+
+/** @} */
+
+
+
+/**
+ * @defgroup album Album subsystem
+ * @{
+ */
+
+/**
+ * Album types
+ */
+typedef enum {
+ SP_ALBUMTYPE_ALBUM = 0, ///< Normal album
+ SP_ALBUMTYPE_SINGLE = 1, ///< Single
+ SP_ALBUMTYPE_COMPILATION = 2, ///< Compilation
+ SP_ALBUMTYPE_UNKNOWN = 3, ///< Unknown type
+} sp_albumtype;
+
+/**
+ * Check if the album object is populated with data
+ *
+ * @param[in] album Album object
+ * @return True if metadata is present, false if not
+ */
+SP_LIBEXPORT(bool) sp_album_is_loaded(sp_album *album);
+
+
+/**
+ * Return true if the album is available in the current region.
+ *
+ * @param[in] album The album
+ *
+ * @return True if album is available for playback, otherwise false.
+ *
+ * @note The album must be loaded or this function will always return false.
+ * @see sp_album_is_loaded()
+ */
+SP_LIBEXPORT(bool) sp_album_is_available(sp_album *album);
+
+/**
+ * Get the artist associated with the given album
+ *
+ * @param[in] album Album object
+ * @return A reference to the artist. NULL if the metadata has not been loaded yet
+ */
+SP_LIBEXPORT(sp_artist *) sp_album_artist(sp_album *album);
+
+/**
+ * Return image ID representing the album's coverart.
+ *
+ * @param[in] album Album object
+ * @param[in] size The desired size of the image
+ *
+ * @return ID byte sequence that can be passed to sp_image_create()
+ * If the album has no image or the metadata for the album is not
+ * loaded yet, this function returns NULL.
+ *
+ * @see sp_image_create
+ */
+SP_LIBEXPORT(const byte *) sp_album_cover(sp_album *album, sp_image_size size);
+
+/**
+ * Return name of album
+ *
+ * @param[in] album Album object
+ *
+ * @return Name of album.
+ * Returned string is valid as long as the album object stays allocated
+ * and no longer than the next call to sp_session_process_events()
+ */
+SP_LIBEXPORT(const char *) sp_album_name(sp_album *album);
+
+/**
+ * Return release year of specified album
+ *
+ * @param[in] album Album object
+ *
+ * @return Release year
+ */
+SP_LIBEXPORT(int) sp_album_year(sp_album *album);
+
+
+/**
+ * Return type of specified album
+ *
+ * @param[in] album Album object
+ *
+ * @return sp_albumtype
+ */
+SP_LIBEXPORT(sp_albumtype) sp_album_type(sp_album *album);
+
+
+/**
+ * Increase the reference count of an album
+ *
+ * @param[in] album The album object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_album_add_ref(sp_album *album);
+
+/**
+ * Decrease the reference count of an album
+ *
+ * @param[in] album The album object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_album_release(sp_album *album);
+
+/** @} */
+
+
+
+/**
+ * @defgroup artist Artist subsystem
+ * @{
+ */
+
+/**
+ * Return name of artist
+ *
+ * @param[in] artist Artist object
+ *
+ * @return Name of artist.
+ * Returned string is valid as long as the artist object stays allocated
+ * and no longer than the next call to sp_session_process_events()
+ */
+SP_LIBEXPORT(const char *) sp_artist_name(sp_artist *artist);
+
+/**
+ * Check if the artist object is populated with data
+ *
+ * @param[in] artist An artist object
+ *
+ * @return True if metadata is present, false if not
+ *
+ */
+SP_LIBEXPORT(bool) sp_artist_is_loaded(sp_artist *artist);
+
+/**
+ * Return portrait for artist
+ *
+ * @param[in] artist The artist object
+ * @param[in] size The desired size of the image
+ *
+ * @return ID byte sequence that can be passed to sp_image_create()
+ * If the artist has no image or the metadata for the album is not
+ * loaded yet, this function returns NULL.
+ *
+ */
+SP_LIBEXPORT(const byte *) sp_artist_portrait(sp_artist *artist, sp_image_size size);
+
+/**
+ * Increase the reference count of a artist
+ *
+ * @param[in] artist The artist object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_artist_add_ref(sp_artist *artist);
+
+/**
+ * Decrease the reference count of a artist
+ *
+ * @param[in] artist The artist object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_artist_release(sp_artist *artist);
+
+/** @} */
+
+
+/**
+ * @defgroup albumbrowse Album browsing
+ *
+ * Browsing adds additional information to what an ::sp_album holds. It retrieves
+ * copyrights, reviews and tracks of the album.
+ *
+ * @{
+ */
+
+/**
+ * The type of a callback used in sp_albumbrowse_create()
+ *
+ * When the callback is called, the metadata of all tracks belonging to it will have
+ * been loaded, so sp_track_is_loaded() will return non-zero. The ::sp_artist of the
+ * album will also have been fully loaded.
+ *
+ * @param[in] result The same pointer returned by sp_albumbrowse_create()
+ * @param[in] userdata The opaque pointer given to sp_albumbrowse_create()
+ */
+typedef void SP_CALLCONV albumbrowse_complete_cb(sp_albumbrowse *result, void *userdata);
+
+/**
+ * Initiate a request for browsing an album
+ *
+ * The user is responsible for freeing the returned album browse using sp_albumbrowse_release(). This can be done in the callback.
+ *
+ * @param[in] session Session object
+ * @param[in] album Album to be browsed. The album metadata does not have to be loaded
+ * @param[in] callback Callback to be invoked when browsing has been completed. Pass NULL if you are not interested in this event.
+ * @param[in] userdata Userdata passed to callback.
+ *
+ * @return Album browse object
+ *
+ * @see ::albumbrowse_complete_cb
+ */
+SP_LIBEXPORT(sp_albumbrowse *) sp_albumbrowse_create(sp_session *session, sp_album *album, albumbrowse_complete_cb *callback, void *userdata);
+
+/**
+ * Check if an album browse request is completed
+ *
+ * @param[in] alb Album browse object
+ *
+ * @return True if browsing is completed, false if not
+ */
+SP_LIBEXPORT(bool) sp_albumbrowse_is_loaded(sp_albumbrowse *alb);
+
+
+/**
+* Check if browsing returned an error code.
+*
+* @param[in] alb Album browse object
+*
+* @return One of the following errors, from ::sp_error
+* SP_ERROR_OK
+* SP_ERROR_IS_LOADING
+* SP_ERROR_OTHER_PERMANENT
+* SP_ERROR_OTHER_TRANSIENT
+*/
+SP_LIBEXPORT(sp_error) sp_albumbrowse_error(sp_albumbrowse *alb);
+
+/**
+ * Given an album browse object, return the pointer to its album object
+ *
+ * @param[in] alb Album browse object
+ *
+ * @return Album object
+ */
+SP_LIBEXPORT(sp_album *) sp_albumbrowse_album(sp_albumbrowse *alb);
+
+/**
+ * Given an album browse object, return the pointer to its artist object
+ *
+ * @param[in] alb Album browse object
+ *
+ * @return Artist object
+ */
+SP_LIBEXPORT(sp_artist *) sp_albumbrowse_artist(sp_albumbrowse *alb);
+
+/**
+ * Given an album browse object, return number of copyright strings
+ *
+ * @param[in] alb Album browse object
+ *
+ * @return Number of copyright strings available, 0 if unknown
+ */
+SP_LIBEXPORT(int) sp_albumbrowse_num_copyrights(sp_albumbrowse *alb);
+
+/**
+ * Given an album browse object, return one of its copyright strings
+ *
+ * @param[in] alb Album browse object
+ * @param[in] index The index for the copyright string. Should be in the interval [0, sp_albumbrowse_num_copyrights() - 1]
+ *
+ * @return Copyright string in UTF-8 format, or NULL if the index is invalid.
+ * Returned string is valid as long as the album object stays allocated
+ * and no longer than the next call to sp_session_process_events()
+ */
+SP_LIBEXPORT(const char *) sp_albumbrowse_copyright(sp_albumbrowse *alb, int index);
+
+/**
+ * Given an album browse object, return number of tracks
+ *
+ * @param[in] alb Album browse object
+ *
+ * @return Number of tracks on album
+ */
+SP_LIBEXPORT(int) sp_albumbrowse_num_tracks(sp_albumbrowse *alb);
+
+/**
+ * Given an album browse object, return a pointer to one of its tracks
+ *
+ * @param[in] alb Album browse object
+ * @param[in] index The index for the track. Should be in the interval [0, sp_albumbrowse_num_tracks() - 1]
+ *
+ * @return A track.
+ *
+ * @see track
+ */
+SP_LIBEXPORT(sp_track *) sp_albumbrowse_track(sp_albumbrowse *alb, int index);
+
+/**
+ * Given an album browse object, return its review
+ *
+ * @param[in] alb Album browse object
+ *
+ * @return Review string in UTF-8 format.
+ * Returned string is valid as long as the album object stays allocated
+ * and no longer than the next call to sp_session_process_events()
+ */
+SP_LIBEXPORT(const char *) sp_albumbrowse_review(sp_albumbrowse *alb);
+
+/**
+ * Return the time (in ms) that was spent waiting for the Spotify backend to serve the request
+ *
+ * @param[in] alb Album browse object
+ *
+ * @return -1 if the request was served from the local cache
+ * If the result is not yet loaded the return value is undefined
+ */
+SP_LIBEXPORT(int) sp_albumbrowse_backend_request_duration(sp_albumbrowse *alb);
+
+
+/**
+ * Increase the reference count of an album browse result
+ *
+ * @param[in] alb The album browse result object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_albumbrowse_add_ref(sp_albumbrowse *alb);
+
+/**
+ * Decrease the reference count of an album browse result
+ *
+ * @param[in] alb The album browse result object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_albumbrowse_release(sp_albumbrowse *alb);
+
+/** @} */
+
+
+/**
+ * @defgroup artistbrowse Artist browsing
+ *
+ * Artist browsing initiates the fetching of information for a certain artist.
+ *
+ * @note There is currently no built-in functionality available for getting the albums belonging
+ * to an artist. For now, just iterate over all tracks and note the album to build a list of all albums.
+ * This feature will be added in a future version of the library.
+ *
+ * @{
+ */
+
+/**
+ * The type of a callback used in sp_artistbrowse_create()
+ *
+ * When the callback is called, the metadata of all tracks belonging to it will have
+ * been loaded, so sp_track_is_loaded() will return non-zero. The same goes for the
+ * similar artist data.
+ *
+ * @param[in] result The same pointer returned by sp_artistbrowse_create()
+ * @param[in] userdata The opaque pointer given to sp_artistbrowse_create()
+ */
+typedef void SP_CALLCONV artistbrowse_complete_cb(sp_artistbrowse *result, void *userdata);
+
+/**
+ * Initiate a request for browsing an artist
+ *
+ * The user is responsible for freeing the returned artist browse using sp_artistbrowse_release(). This can be done in the callback.
+ *
+ * @param[in] session Session object
+ * @param[in] artist Artist to be browsed. The artist metadata does not have to be loaded
+ * @param[in] type Type of data requested, see the sp_artistbrowse_type enum for details
+ * @param[in] callback Callback to be invoked when browsing has been completed. Pass NULL if you are not interested in this event.
+ * @param[in] userdata Userdata passed to callback.
+ *
+ * @return Artist browse object
+ *
+ * @see ::artistbrowse_complete_cb
+ */
+SP_LIBEXPORT(sp_artistbrowse *) sp_artistbrowse_create(sp_session *session, sp_artist *artist, sp_artistbrowse_type type, artistbrowse_complete_cb *callback, void *userdata);
+
+/**
+ * Check if an artist browse request is completed
+ *
+ * @param[in] arb Artist browse object
+ *
+ * @return True if browsing is completed, false if not
+ */
+SP_LIBEXPORT(bool) sp_artistbrowse_is_loaded(sp_artistbrowse *arb);
+
+/**
+* Check if browsing returned an error code.
+*
+* @param[in] arb Artist browse object
+*
+* @return One of the following errors, from ::sp_error
+* SP_ERROR_OK
+* SP_ERROR_IS_LOADING
+* SP_ERROR_OTHER_PERMANENT
+* SP_ERROR_OTHER_TRANSIENT
+*/
+SP_LIBEXPORT(sp_error) sp_artistbrowse_error(sp_artistbrowse *arb);
+
+/**
+ * Given an artist browse object, return a pointer to its artist object
+ *
+ * @param[in] arb Artist browse object
+ *
+ * @return Artist object
+ */
+SP_LIBEXPORT(sp_artist *) sp_artistbrowse_artist(sp_artistbrowse *arb);
+
+/**
+ * Given an artist browse object, return number of portraits available
+ *
+ * @param[in] arb Artist browse object
+ *
+ * @return Number of portraits for given artist
+ */
+SP_LIBEXPORT(int) sp_artistbrowse_num_portraits(sp_artistbrowse *arb);
+
+/**
+ * Return image ID representing a portrait of the artist
+ *
+ * @param[in] arb Artist object
+ * @param[in] index The index of the portrait. Should be in the interval [0, sp_artistbrowse_num_portraits() - 1]
+ *
+ * @return ID byte sequence that can be passed to sp_image_create()
+ *
+ * @see sp_image_create
+ */
+SP_LIBEXPORT(const byte *) sp_artistbrowse_portrait(sp_artistbrowse *arb, int index);
+
+/**
+ * Given an artist browse object, return number of tracks
+ *
+ * @param[in] arb Artist browse object
+ *
+ * @return Number of tracks for given artist
+ */
+SP_LIBEXPORT(int) sp_artistbrowse_num_tracks(sp_artistbrowse *arb);
+
+/**
+ * Given an artist browse object, return one of its tracks
+ *
+ * @param[in] arb Album browse object
+ * @param[in] index The index for the track. Should be in the interval [0, sp_artistbrowse_num_tracks() - 1]
+ *
+ * @return A track object, or NULL if the index is out of range.
+ *
+ * @see track
+ */
+SP_LIBEXPORT(sp_track *) sp_artistbrowse_track(sp_artistbrowse *arb, int index);
+
+
+/**
+ * Given an artist browse object, return number of tophit tracks
+ * This is a set of tracks for the artist with highest popularity
+ *
+ * @param[in] arb Artist browse object
+ *
+ * @return Number of tophit tracks for given artist
+ */
+SP_LIBEXPORT(int) sp_artistbrowse_num_tophit_tracks(sp_artistbrowse *arb);
+
+/**
+ * Given an artist browse object, return one of its tophit tracks
+ * This is a set of tracks for the artist with highest popularity
+ *
+ * @param[in] arb Album browse object
+ * @param[in] index The index for the track. Should be in the interval [0, sp_artistbrowse_num_tophit_tracks() - 1]
+ *
+ * @return A track object, or NULL if the index is out of range.
+ *
+ * @see track
+ */
+SP_LIBEXPORT(sp_track *) sp_artistbrowse_tophit_track(sp_artistbrowse *arb, int index);
+
+/**
+ * Given an artist browse object, return number of albums
+ *
+ * @param[in] arb Artist browse object
+ *
+ * @return Number of albums for given artist
+ */
+SP_LIBEXPORT(int) sp_artistbrowse_num_albums(sp_artistbrowse *arb);
+
+/**
+ * Given an artist browse object, return one of its albums
+ *
+ * @param[in] arb Album browse object
+ * @param[in] index The index for the album. Should be in the interval [0, sp_artistbrowse_num_albums() - 1]
+ *
+ * @return A album object, or NULL if the index is out of range.
+ *
+ * @see album
+ */
+SP_LIBEXPORT(sp_album *) sp_artistbrowse_album(sp_artistbrowse *arb, int index);
+
+/**
+ * Given an artist browse object, return number of similar artists
+ *
+ * @param[in] arb Artist browse object
+ *
+ * @return Number of similar artists for given artist
+ */
+SP_LIBEXPORT(int) sp_artistbrowse_num_similar_artists(sp_artistbrowse *arb);
+
+/**
+ * Given an artist browse object, return a similar artist by index
+ *
+ * @param[in] arb Album browse object
+ * @param[in] index The index for the artist. Should be in the interval [0, sp_artistbrowse_num_similar_artists() - 1]
+ *
+ * @return A pointer to an artist object.
+ *
+ * @see artist
+ */
+SP_LIBEXPORT(sp_artist *) sp_artistbrowse_similar_artist(sp_artistbrowse *arb, int index);
+
+/**
+ * Given an artist browse object, return the artists biography
+ *
+ * @note This function must be called from the same thread that did sp_session_create()
+ * @param[in] arb Artist browse object
+ *
+ * @return Biography string in UTF-8 format.
+ * Returned string is valid as long as the album object stays allocated
+ * and no longer than the next call to sp_session_process_events()
+ */
+SP_LIBEXPORT(const char *) sp_artistbrowse_biography(sp_artistbrowse *arb);
+
+/**
+ * Return the time (in ms) that was spent waiting for the Spotify backend to serve the request
+ *
+ * @param[in] arb Artist browse object
+ *
+ * @return -1 if the request was served from the local cache
+ * If the result is not yet loaded the return value is undefined
+ */
+SP_LIBEXPORT(int) sp_artistbrowse_backend_request_duration(sp_artistbrowse *arb);
+
+
+/**
+ * Increase the reference count of an artist browse result
+ *
+ * @param[in] arb The artist browse result object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_artistbrowse_add_ref(sp_artistbrowse *arb);
+
+/**
+ * Decrease the reference count of an artist browse result
+ *
+ * @param[in] arb The artist browse result object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_artistbrowse_release(sp_artistbrowse *arb);
+
+/** @} */
+
+
+
+/**
+ * @defgroup image Image handling
+ * @{
+ */
+
+/**
+ * Image format
+ */
+typedef enum {
+ SP_IMAGE_FORMAT_UNKNOWN = -1, ///< Unknown image format
+ SP_IMAGE_FORMAT_JPEG = 0, ///< JPEG image
+} sp_imageformat;
+
+/**
+ * The type of a callback used to notify the application that an image
+ * is done loading.
+ */
+typedef void SP_CALLCONV image_loaded_cb(sp_image *image, void *userdata);
+
+/**
+ * Create an image object
+ *
+ * @param[in] session Session
+ * @param[in] image_id Spotify image ID
+ *
+ * @return Pointer to an image object. To free the object, use
+ * sp_image_release()
+ *
+ * @see sp_album_cover
+ * @see sp_artistbrowse_portrait
+ */
+SP_LIBEXPORT(sp_image *) sp_image_create(sp_session *session, const byte image_id[20]);
+
+/**
+ * Create an image object from a link
+ *
+ * @param[in] session Session
+ * @param[in] l Spotify link object. This must be of SP_LINKTYPE_IMAGE type
+ *
+ * @return Pointer to an image object. To free the object, use
+ * sp_image_release()
+ *
+ * @see sp_image_create
+ */
+SP_LIBEXPORT(sp_image *) sp_image_create_from_link(sp_session *session, sp_link *l);
+
+/**
+ * Add a callback that will be invoked when the image is loaded
+ *
+ * If an image is loaded, and loading fails, the image will behave like an
+ * empty image.
+ *
+ * @param[in] image Image object
+ * @param[in] callback Callback that will be called when image has been
+ * fetched.
+ * @param[in] userdata Opaque pointer passed to \p callback
+ *
+ */
+SP_LIBEXPORT(sp_error) sp_image_add_load_callback(sp_image *image, image_loaded_cb *callback, void *userdata);
+
+/**
+ * Remove an image load callback previously added with sp_image_add_load_callback()
+ *
+ * @param[in] image Image object
+ * @param[in] callback Callback that will not be called when image has been
+ * fetched.
+ * @param[in] userdata Opaque pointer passed to \p callback
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_image_remove_load_callback(sp_image *image, image_loaded_cb *callback, void *userdata);
+
+/**
+ * Check if an image is loaded. Before the image is loaded, the rest of the
+ * methods will behave as if the image is empty.
+ *
+ * @param[in] image Image object
+ *
+ * @return True if image is loaded, false otherwise
+ */
+SP_LIBEXPORT(bool) sp_image_is_loaded(sp_image *image);
+
+/**
+* Check if image retrieval returned an error code.
+*
+* @param[in] image Image object
+*
+* @return One of the following errors, from ::sp_error
+* SP_ERROR_OK
+* SP_ERROR_IS_LOADING
+* SP_ERROR_OTHER_PERMANENT
+* SP_ERROR_OTHER_TRANSIENT
+*/
+SP_LIBEXPORT(sp_error) sp_image_error(sp_image *image);
+
+/**
+ * Get image format
+ *
+ * @param[in] image Image object
+ *
+ * @return Image format as described by sp_imageformat
+ */
+SP_LIBEXPORT(sp_imageformat) sp_image_format(sp_image *image);
+
+/**
+* Get image data
+*
+* @param[in] image Image object
+* @param[out] data_size Size of raw image data
+*
+* @return Pointer to raw image data
+*/
+
+SP_LIBEXPORT(const void *) sp_image_data(sp_image *image, size_t *data_size);
+
+/**
+ * Get image ID
+ *
+ * @param[in] image Image object
+ *
+ * @return Image ID
+ */
+SP_LIBEXPORT(const byte *) sp_image_image_id(sp_image *image);
+
+
+/**
+ * Increase the reference count of an image
+ *
+ * @param[in] image The image object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_image_add_ref(sp_image *image);
+
+/**
+ * Decrease the reference count of an image
+ *
+ * @param[in] image The image object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_image_release(sp_image *image);
+
+/** @} */
+
+
+
+/**
+ * @defgroup search Search subsystem
+ * @{
+ */
+
+/**
+ * The type of a callback used in sp_search_create()
+ *
+ * When this callback is called, the sp_track_is_loaded(), sp_album_is_loaded(),
+ * and sp_artist_is_loaded() functions will return non-zero for the objects
+ * contained in the search result.
+ *
+ * @param[in] result The same pointer returned by sp_search_create()
+ * @param[in] userdata The opaque pointer given to sp_search_create()
+ */
+typedef void SP_CALLCONV search_complete_cb(sp_search *result, void *userdata);
+
+/**
+ * Create a search object from the given query
+ *
+ * @param[in] session Session
+ * @param[in] query Query search string, e.g. 'The Rolling Stones' or 'album:"The Black Album"'
+ * @param[in] track_offset The offset among the tracks of the result
+ * @param[in] track_count The number of tracks to ask for
+ * @param[in] album_offset The offset among the albums of the result
+ * @param[in] album_count The number of albums to ask for
+ * @param[in] artist_offset The offset among the artists of the result
+ * @param[in] artist_count The number of artists to ask for
+ * @param[in] playlist_offset The offset among the playlists of the result
+ * @param[in] playlist_count The number of playlists to ask for
+ * @param[in] search_type Type of search, can be used for suggest searches
+ * @param[in] callback Callback that will be called once the search operation is complete. Pass NULL if you are not interested in this event.
+ * @param[in] userdata Opaque pointer passed to \p callback
+ *
+ * @return Pointer to a search object. To free the object, use sp_search_release()
+ */
+SP_LIBEXPORT(sp_search *) sp_search_create(sp_session *session, const char *query, int track_offset, int track_count, int album_offset, int album_count, int artist_offset, int artist_count, int playlist_offset, int playlist_count, sp_search_type search_type, search_complete_cb *callback, void *userdata);
+
+/**
+ * Get load status for the specified search. Before it is loaded, it will behave as an empty search result.
+ *
+ * @param[in] search Search object
+ *
+ * @return True if search is loaded, otherwise false
+ */
+SP_LIBEXPORT(bool) sp_search_is_loaded(sp_search *search);
+
+/**
+* Check if search returned an error code.
+*
+* @param[in] search Search object
+*
+* @return One of the following errors, from ::sp_error
+* SP_ERROR_OK
+* SP_ERROR_IS_LOADING
+* SP_ERROR_OTHER_PERMANENT
+* SP_ERROR_OTHER_TRANSIENT
+*/
+SP_LIBEXPORT(sp_error) sp_search_error(sp_search *search);
+
+/**
+ * Get the number of tracks for the specified search
+ *
+ * @param[in] search Search object
+ *
+ * @return The number of tracks for the specified search
+ */
+SP_LIBEXPORT(int) sp_search_num_tracks(sp_search *search);
+
+/**
+ * Return the track at the given index in the given search object
+ *
+ * @param[in] search Search object
+ * @param[in] index Index of the wanted track. Should be in the interval [0, sp_search_num_tracks() - 1]
+ *
+ * @return The track at the given index in the given search object
+ */
+SP_LIBEXPORT(sp_track *) sp_search_track(sp_search *search, int index);
+
+/**
+ * Get the number of albums for the specified search
+ *
+ * @param[in] search Search object
+ *
+ * @return The number of albums for the specified search
+ */
+SP_LIBEXPORT(int) sp_search_num_albums(sp_search *search);
+
+/**
+ * Return the album at the given index in the given search object
+ *
+ * @param[in] search Search object
+ * @param[in] index Index of the wanted album. Should be in the interval [0, sp_search_num_albums() - 1]
+ *
+ * @return The album at the given index in the given search object
+ */
+SP_LIBEXPORT(sp_album *) sp_search_album(sp_search *search, int index);
+
+/**
+ * Get the number of playlists for the specified search
+ *
+ * @param[in] search Search object
+ *
+ * @return The number of playlists for the specified search
+ */
+SP_LIBEXPORT(int) sp_search_num_playlists(sp_search *search);
+
+/**
+ * Load the playlist at the given index in the given search object
+ *
+ * @param[in] search Search object
+ * @param[in] index Index of the wanted playlist. Should be in the interval [0, sp_search_num_playlists() - 1]
+ *
+ * @return A playlist object. This reference is owned by the caller and should be released with sp_playlist_release()
+ */
+SP_LIBEXPORT(sp_playlist *) sp_search_playlist(sp_search *search, int index);
+
+/**
+ * Return the playlist at the given index in the given search object
+ *
+ * @param[in] search Search object
+ * @param[in] index Index of the wanted playlist. Should be in the interval [0, sp_search_num_playlists() - 1]
+ *
+ * @return The playlist name at the given index in the given search object
+ */
+SP_LIBEXPORT(const char *) sp_search_playlist_name(sp_search *search, int index);
+
+/**
+ * Return the uri of a playlist at the given index in the given search object
+ *
+ * @param[in] search Search object
+ * @param[in] index Index of the wanted playlist. Should be in the interval [0, sp_search_num_playlists() - 1]
+ *
+ * @return The playlist uri at the given index in the given search object
+ */
+SP_LIBEXPORT(const char *) sp_search_playlist_uri(sp_search *search, int index);
+
+/**
+ * Return the image_uri of a playlist at the given index in the given search object
+ *
+ * @param[in] search Search object
+ * @param[in] index Index of the wanted playlist. Should be in the interval [0, sp_search_num_playlists() - 1]
+ *
+ * @return The playlist image_uri at the given index in the given search object
+ */
+SP_LIBEXPORT(const char *) sp_search_playlist_image_uri(sp_search *search, int index);
+
+/**
+ * Get the number of artists for the specified search
+ *
+ * @param[in] search Search object
+ *
+ * @return The number of artists for the specified search
+ */
+SP_LIBEXPORT(int) sp_search_num_artists(sp_search *search);
+
+/**
+ * Return the artist at the given index in the given search object
+ *
+ * @param[in] search Search object
+ * @param[in] index Index of the wanted artist. Should be in the interval [0, sp_search_num_artists() - 1]
+ *
+ * @return The artist at the given index in the given search object
+ */
+SP_LIBEXPORT(sp_artist *) sp_search_artist(sp_search *search, int index);
+
+/**
+ * Return the search query for the given search object
+ *
+ * @param[in] search Search object
+ *
+ * @return The search query for the given search object
+ */
+SP_LIBEXPORT(const char *) sp_search_query(sp_search *search);
+
+/**
+ * Return the "Did you mean" query for the given search object
+ *
+ * @param[in] search Search object
+ *
+ * @return The "Did you mean" query for the given search object, or the empty string if no such info is available
+ */
+SP_LIBEXPORT(const char *) sp_search_did_you_mean(sp_search *search);
+
+/**
+ * Return the total number of tracks for the search query - regardless of the interval requested at creation.
+ * If this value is larger than the interval specified at creation of the search object, more search results are available.
+ * To fetch these, create a new search object with a new interval.
+ *
+ * @param[in] search Search object
+ *
+ * @return The total number of tracks matching the original query
+ */
+SP_LIBEXPORT(int) sp_search_total_tracks(sp_search *search);
+
+/**
+ * Return the total number of albums for the search query - regardless of the interval requested at creation.
+ * If this value is larger than the interval specified at creation of the search object, more search results are available.
+ * To fetch these, create a new search object with a new interval.
+ *
+ * @param[in] search Search object
+ *
+ * @return The total number of albums matching the original query
+ */
+SP_LIBEXPORT(int) sp_search_total_albums(sp_search *search);
+
+/**
+ * Return the total number of artists for the search query - regardless of the interval requested at creation.
+ * If this value is larger than the interval specified at creation of the search object, more search results are available.
+ * To fetch these, create a new search object with a new interval.
+ *
+ * @param[in] search Search object
+ *
+ * @return The total number of artists matching the original query
+ */
+SP_LIBEXPORT(int) sp_search_total_artists(sp_search *search);
+
+/**
+ * Return the total number of playlists for the search query - regardless of the interval requested at creation.
+ * If this value is larger than the interval specified at creation of the search object, more search results are available.
+ * To fetch these, create a new search object with a new interval.
+ *
+ * @param[in] search Search object
+ *
+ * @return The total number of playlists matching the original query
+ */
+SP_LIBEXPORT(int) sp_search_total_playlists(sp_search *search);
+
+/**
+ * Increase the reference count of a search result
+ *
+ * @param[in] search The search result object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_search_add_ref(sp_search *search);
+
+/**
+ * Decrease the reference count of a search result
+ *
+ * @param[in] search The search result object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_search_release(sp_search *search);
+
+/** @} */
+
+
+
+
+/**
+ * @defgroup playlist Playlist subsystem
+ *
+ * The playlist subsystem handles playlists and playlist containers (list of playlists).
+ *
+ * The playlist container functions are always valid, but your playlists are not
+ * guaranteed to be loaded until the sp_session_callbacks#logged_in callback has
+ * been issued.
+ *
+ * @{
+ */
+
+/**
+ * Playlist callbacks
+ *
+ * Used to get notifications when playlists are updated.
+ * If some callbacks should not be of interest, set them to NULL.
+ */
+typedef struct sp_playlist_callbacks {
+
+ /**
+ * Called when one or more tracks have been added to a playlist
+ *
+ * @param[in] pl Playlist object
+ * @param[in] tracks Array of pointers to track objects
+ * @param[in] num_tracks Number of entries in \p tracks
+ * @param[in] position Position in the playlist for the first track.
+ * @param[in] userdata Userdata passed to sp_playlist_add_callbacks()
+ */
+ void (SP_CALLCONV *tracks_added)(sp_playlist *pl, sp_track * const *tracks, int num_tracks, int position, void *userdata);
+
+ /**
+ * Called when one or more tracks have been removed from a playlist
+ *
+ * @param[in] pl Playlist object
+ * @param[in] tracks Array of positions representing the tracks that were removed
+ * @param[in] num_tracks Number of entries in \p tracks
+ * @param[in] userdata Userdata passed to sp_playlist_add_callbacks()
+ */
+ void (SP_CALLCONV *tracks_removed)(sp_playlist *pl, const int *tracks, int num_tracks, void *userdata);
+
+ /**
+ * Called when one or more tracks have been moved within a playlist
+ *
+ * @param[in] pl Playlist object
+ * @param[in] tracks Array of positions representing the tracks that were moved
+ * @param[in] num_tracks Number of entries in \p tracks
+ * @param[in] position New position in the playlist for the first track.
+ * @param[in] userdata Userdata passed to sp_playlist_add_callbacks()
+ */
+ void (SP_CALLCONV *tracks_moved)(sp_playlist *pl, const int *tracks, int num_tracks, int new_position, void *userdata);
+
+ /**
+ * Called when a playlist has been renamed. sp_playlist_name() can be used to find out the new name
+ *
+ * @param[in] pl Playlist object
+ * @param[in] userdata Userdata passed to sp_playlist_add_callbacks()
+ */
+ void (SP_CALLCONV *playlist_renamed)(sp_playlist *pl, void *userdata);
+
+ /**
+ * Called when state changed for a playlist.
+ *
+ * There are three states that trigger this callback:
+ * - Collaboration for this playlist has been turned on or off
+ * - The playlist started having pending changes, or all pending changes have now been committed
+ * - The playlist started loading, or finished loading
+ *
+ * @param[in] pl Playlist object
+ * @param[in] userdata Userdata passed to sp_playlist_add_callbacks()
+ * @sa sp_playlist_is_collaborative
+ * @sa sp_playlist_has_pending_changes
+ * @sa sp_playlist_is_loaded
+ */
+ void (SP_CALLCONV *playlist_state_changed)(sp_playlist *pl, void *userdata);
+
+ /**
+ * Called when a playlist is updating or is done updating
+ *
+ * This is called before and after a series of changes are applied to the
+ * playlist. It allows e.g. the user interface to defer updating until the
+ * entire operation is complete.
+ *
+ * @param[in] pl Playlist object
+ * @param[in] done True iff the update is completed
+ * @param[in] userdata Userdata passed to sp_playlist_add_callbacks()
+ */
+ void (SP_CALLCONV *playlist_update_in_progress)(sp_playlist *pl, bool done, void *userdata);
+
+ /**
+ * Called when metadata for one or more tracks in a playlist has been updated.
+ *
+ * @param[in] pl Playlist object
+ * @param[in] userdata Userdata passed to sp_playlist_add_callbacks()
+ */
+ void (SP_CALLCONV *playlist_metadata_updated)(sp_playlist *pl, void *userdata);
+
+ /**
+ * Called when create time and/or creator for a playlist entry changes
+ *
+ * @param[in] pl Playlist object
+ * @param[in] position Position in playlist
+ * @param[in] user User object
+ * @param[in] time When entry was created, seconds since the unix epoch.
+ * @param[in] userdata Userdata passed to sp_playlist_add_callbacks()
+ */
+ void (SP_CALLCONV *track_created_changed)(sp_playlist *pl, int position, sp_user *user, int when, void *userdata);
+
+ /**
+ * Called when seen attribute for a playlist entry changes.
+ *
+ * @param[in] pl Playlist object
+ * @param[in] position Position in playlist
+ * @param[in] seen Set if entry it marked as seen
+ * @param[in] userdata Userdata passed to sp_playlist_add_callbacks()
+ */
+ void (SP_CALLCONV *track_seen_changed)(sp_playlist *pl, int position, bool seen, void *userdata);
+
+ /**
+ * Called when playlist description has changed
+ *
+ * @param[in] pl Playlist object
+ * @param[in] desc New description
+ * @param[in] userdata Userdata passed to sp_playlist_add_callbacks()
+ */
+ void (SP_CALLCONV *description_changed)(sp_playlist *pl, const char *desc, void *userdata);
+
+
+ /**
+ * Called when playlist image has changed
+ *
+ * @param[in] pl Playlist object
+ * @param[in] image New image
+ * @param[in] userdata Userdata passed to sp_playlist_add_callbacks()
+ */
+ void (SP_CALLCONV *image_changed)(sp_playlist *pl, const byte *image, void *userdata);
+
+
+ /**
+ * Called when message attribute for a playlist entry changes.
+ *
+ * @param[in] pl Playlist object
+ * @param[in] position Position in playlist
+ * @param[in] message UTF-8 encoded message
+ * @param[in] userdata Userdata passed to sp_playlist_add_callbacks()
+ */
+ void (SP_CALLCONV *track_message_changed)(sp_playlist *pl, int position, const char *message, void *userdata);
+
+
+ /**
+ * Called when playlist subscribers changes (count or list of names)
+ *
+ * @param[in] pl Playlist object
+ * @param[in] userdata Userdata passed to sp_playlist_add_callbacks()
+ */
+ void (SP_CALLCONV *subscribers_changed)(sp_playlist *pl, void *userdata);
+
+} sp_playlist_callbacks;
+
+
+/**
+ * Get load status for the specified playlist. If it's false, you have to wait until
+ * playlist_state_changed happens, and check again if is_loaded has changed
+ *
+ * @param[in] playlist Playlist object
+ *
+ * @return True if playlist is loaded, otherwise false
+ */
+SP_LIBEXPORT(bool) sp_playlist_is_loaded(sp_playlist *playlist);
+
+/**
+ * Register interest in the given playlist
+ *
+ * Here is a snippet from \c jukebox.c:
+ * @dontinclude jukebox.c
+ * @skipline sp_playlist_add_callbacks
+ *
+ * @param[in] playlist Playlist object
+ * @param[in] callbacks Callbacks, see #sp_playlist_callbacks
+ * @param[in] userdata Userdata to be passed to callbacks
+ * @sa sp_playlist_remove_callbacks
+ *
+ */
+SP_LIBEXPORT(sp_error) sp_playlist_add_callbacks(sp_playlist *playlist, sp_playlist_callbacks *callbacks, void *userdata);
+
+/**
+ * Unregister interest in the given playlist
+ *
+ * The combination of (\p callbacks, \p userdata) is used to find the entry to be removed
+ *
+ * Here is a snippet from \c jukebox.c:
+ * @dontinclude jukebox.c
+ * @skipline sp_playlist_remove_callbacks
+ *
+ * @param[in] playlist Playlist object
+ * @param[in] callbacks Callbacks, see #sp_playlist_callbacks
+ * @param[in] userdata Userdata to be passed to callbacks
+ * @sa sp_playlist_add_callbacks
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ *
+ */
+SP_LIBEXPORT(sp_error) sp_playlist_remove_callbacks(sp_playlist *playlist, sp_playlist_callbacks *callbacks, void *userdata);
+
+/**
+ * Return number of tracks in the given playlist
+ *
+ * @param[in] playlist Playlist object
+ *
+ * @return The number of tracks in the playlist
+ */
+SP_LIBEXPORT(int) sp_playlist_num_tracks(sp_playlist *playlist);
+
+/**
+ * Return the track at the given index in a playlist
+ *
+ * @param[in] playlist Playlist object
+ * @param[in] index Index into playlist container. Should be in the interval [0, sp_playlist_num_tracks() - 1]
+ *
+ * @return The track at the given index
+ */
+SP_LIBEXPORT(sp_track *) sp_playlist_track(sp_playlist *playlist, int index);
+
+/**
+ * Return when the given index was added to the playlist
+ *
+ * @param[in] playlist Playlist object
+ * @param[in] index Index into playlist container. Should be in the interval [0, sp_playlist_num_tracks() - 1]
+ *
+ * @return Time, Seconds since unix epoch.
+ */
+SP_LIBEXPORT(int) sp_playlist_track_create_time(sp_playlist *playlist, int index);
+
+/**
+ * Return user that added the given index in the playlist
+ *
+ * @param[in] playlist Playlist object
+ * @param[in] index Index into playlist container. Should be in the interval [0, sp_playlist_num_tracks() - 1]
+ *
+ * @return User object
+ */
+SP_LIBEXPORT(sp_user *) sp_playlist_track_creator(sp_playlist *playlist, int index);
+
+/**
+ * Return if a playlist entry is marked as seen or not
+ *
+ * @param[in] playlist Playlist object
+ * @param[in] index Index into playlist container. Should be in the interval [0, sp_playlist_num_tracks() - 1]
+ *
+ * @return Seen state
+ */
+SP_LIBEXPORT(bool) sp_playlist_track_seen(sp_playlist *playlist, int index);
+
+/**
+ * Set seen status of a playlist entry
+ *
+ * @param[in] playlist Playlist object
+ * @param[in] index Index into playlist container. Should be in the interval [0, sp_playlist_num_tracks() - 1]
+ * @param[in] seen Seen status to be set
+ *
+ * @return error One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ * SP_ERROR_INDEX_OUT_OF_RANGE
+ */
+SP_LIBEXPORT(sp_error) sp_playlist_track_set_seen(sp_playlist *playlist, int index, bool seen);
+
+/**
+ * Return a message attached to a playlist item. Typically used on inbox.
+ *
+ * @param[in] playlist Playlist object
+ * @param[in] index Index into playlist container. Should be in the interval [0, sp_playlist_num_tracks() - 1]
+ *
+ * @return UTF-8 encoded message, or NULL if no message is present
+ */
+SP_LIBEXPORT(const char *) sp_playlist_track_message(sp_playlist *playlist, int index);
+
+/**
+ * Return name of given playlist
+ *
+ * @param[in] playlist Playlist object
+ *
+ * @return The name of the given playlist
+ */
+SP_LIBEXPORT(const char *) sp_playlist_name(sp_playlist *playlist);
+
+/**
+ * Rename the given playlist
+ * The name must not consist of only spaces and it must be shorter than 256 characters.
+ *
+ * @param[in] playlist Playlist object
+ * @param[in] new_name New name for playlist
+ *
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ * SP_ERROR_INVALID_INDATA
+ * SP_ERROR_PERMISSION_DENIED
+ */
+SP_LIBEXPORT(sp_error) sp_playlist_rename(sp_playlist *playlist, const char *new_name);
+
+/**
+ * Return a pointer to the user for the given playlist
+ *
+ * @param[in] playlist Playlist object
+ *
+ * @return User object
+ */
+SP_LIBEXPORT(sp_user *) sp_playlist_owner(sp_playlist *playlist);
+
+/**
+ * Return collaborative status for a playlist.
+ *
+ * A playlist in collaborative state can be modifed by all users, not only the user owning the list
+ *
+ * @param[in] playlist Playlist object
+ *
+ * @return true if playlist is collaborative, otherwise false
+ */
+SP_LIBEXPORT(bool) sp_playlist_is_collaborative(sp_playlist *playlist);
+
+/**
+ * Set collaborative status for a playlist.
+ *
+ * A playlist in collaborative state can be modified by all users, not only the user owning the list
+ *
+ * @param[in] playlist Playlist object
+ * @param[in] collaborative True or false
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_playlist_set_collaborative(sp_playlist *playlist, bool collaborative);
+
+/**
+ * Set autolinking state for a playlist.
+ *
+ * If a playlist is autolinked, unplayable tracks will be made playable
+ * by linking them to other Spotify tracks, where possible.
+ *
+ * @param[in] playlist Playlist object
+ * @param[in] link True or false
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_playlist_set_autolink_tracks(sp_playlist *playlist, bool link);
+
+
+/**
+ * Get description for a playlist
+ *
+ * @param[in] playlist Playlist object
+ *
+ * @return Playlist description or NULL if unset
+ *
+ */
+SP_LIBEXPORT(const char *) sp_playlist_get_description(sp_playlist *playlist);
+
+
+/**
+ * Get description for a playlist
+ *
+ * @param[in] playlist Playlist object
+ * @param[out] image 20 byte image id
+
+ * @return TRUE if playlist has an image, FALSE if not
+ *
+ */
+SP_LIBEXPORT(bool) sp_playlist_get_image(sp_playlist *playlist, byte image[20]);
+
+
+/**
+ * Check if a playlist has pending changes
+ *
+ * Pending changes are local changes that have not yet been acknowledged by the server.
+ *
+ * @param[in] playlist Playlist object
+ *
+ * @return A flag representing if there are pending changes or not
+ */
+SP_LIBEXPORT(bool) sp_playlist_has_pending_changes(sp_playlist *playlist);
+
+/**
+ * Add tracks to a playlist
+ *
+ * @param[in] playlist Playlist object
+ * @param[in] tracks Array of pointer to tracks.
+ * @param[in] num_tracks Length of \p tracks array
+ * @param[in] position Start position in playlist where to insert the tracks
+ * @param[in] session Your session object
+ *
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ * SP_ERROR_INVALID_INDATA - position is > current playlist length
+ * SP_ERROR_PERMISSION_DENIED
+ */
+SP_LIBEXPORT(sp_error) sp_playlist_add_tracks(sp_playlist *playlist, sp_track *const*tracks, int num_tracks, int position, sp_session *session);
+
+/**
+ * Remove tracks from a playlist
+ *
+ * @param[in] playlist Playlist object
+ * @param[in] tracks Array of pointer to track indices.
+ * A certain track index should be present at most once, e.g. [0, 1, 2] is valid indata,
+ * whereas [0, 1, 1] is invalid.
+ * @param[in] num_tracks Length of \p tracks array
+ *
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ * SP_ERROR_PERMISSION_DENIED
+ */
+SP_LIBEXPORT(sp_error) sp_playlist_remove_tracks(sp_playlist *playlist, const int *tracks, int num_tracks);
+
+/**
+ * Move tracks in playlist
+ *
+ * @param[in] playlist Playlist object
+ * @param[in] tracks Array of pointer to track indices to be moved.
+ * A certain track index should be present at most once, e.g. [0, 1, 2] is valid indata,
+ * whereas [0, 1, 1] is invalid.
+ * @param[in] num_tracks Length of \p tracks array
+ * @param[in] new_position New position for tracks
+ *
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ * SP_ERROR_INVALID_INDATA - position is > current playlist length
+ * SP_ERROR_PERMISSION_DENIED
+ */
+SP_LIBEXPORT(sp_error) sp_playlist_reorder_tracks(sp_playlist *playlist, const int *tracks, int num_tracks, int new_position);
+
+
+/**
+ * Return number of subscribers for a given playlist
+ *
+ * @param[in] playlist Playlist object
+ *
+ * @return Number of subscribers
+ *
+ */
+SP_LIBEXPORT(unsigned int) sp_playlist_num_subscribers(sp_playlist *playlist);
+
+/**
+ * Return subscribers for a playlist
+ *
+ * @param[in] playlist Playlist object
+ *
+ * @return sp_subscribers struct with array of canonical usernames.
+ * This object should be free'd using sp_playlist_subscribers_free()
+ *
+ * @note The count returned for this function may be less than those
+ * returned by sp_playlist_num_subscribers(). Spotify does not
+ * track each user subscribed to a playlist for playlist with
+ * many (>500) subscribers.
+ */
+SP_LIBEXPORT(sp_subscribers *) sp_playlist_subscribers(sp_playlist *playlist);
+
+/**
+ * Free object returned from sp_playlist_subscribers()
+ *
+ * @param[in] subscribers Subscribers object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_playlist_subscribers_free(sp_subscribers *subscribers);
+
+/**
+ * Ask library to update the subscription count for a playlist
+ *
+ * When the subscription info has been fetched from the Spotify backend
+ * the playlist subscribers_changed() callback will be invoked.
+ * In that callback use sp_playlist_num_subscribers() and/or
+ * sp_playlist_subscribers() to get information about the subscribers.
+ * You can call those two functions anytime you want but the information
+ * might not be up to date in such cases
+ *
+ * @param[in] session Session object
+ * @param[in] playlist Playlist object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_playlist_update_subscribers(sp_session *session, sp_playlist *playlist);
+
+/**
+ * Return whether a playlist is loaded in RAM (as opposed to only
+ * stored on disk)
+ *
+ * @param[in] session Session object
+ * @param[in] playlist Playlist object
+ *
+ * @return True iff playlist is in RAM, False otherwise
+ *
+ * @note When a playlist is no longer in RAM it will appear empty.
+ * However, libspotify will retain information about the
+ * list metadata (owner, title, picture, etc) in RAM.
+ * There is one caveat tough: If libspotify has never seen the
+ * playlist before this metadata will also be unset.
+ * In order for libspotify to get the metadata the playlist
+ * needs to be loaded at least once.
+ * In order words, if libspotify starts with an empty playlist
+ * cache and the application has set 'initially_unload_playlists'
+ * config parameter to True all playlists will be empty.
+ * It will not be possible to generate URI's to the playlists
+ * nor extract playlist title until the application calls
+ * sp_playlist_set_in_ram(..., true). So an application
+ * that needs to stay within a low memory profile would need to
+ * cycle thru all new playlists in order to extract metadata.
+ *
+ * The easiest way to detect this case is when
+ * sp_playlist_is_in_ram() returns false and
+ * sp_link_create_from_playlist() returns NULL
+ */
+SP_LIBEXPORT(bool) sp_playlist_is_in_ram(sp_session *session, sp_playlist *playlist);
+
+/**
+ * Return whether a playlist is loaded in RAM (as opposed to only
+ * stored on disk)
+ *
+ * @param[in] session Session object
+ * @param[in] playlist Playlist object
+ * @param[in] in_ram Controls whether or not to keep the list in RAM
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_playlist_set_in_ram(sp_session *session, sp_playlist *playlist, bool in_ram);
+
+/**
+ * Load an already existing playlist without adding it to a playlistcontainer.
+ *
+ * @param[in] session Session object
+ * @param[in] link Link object referring to a playlist
+ *
+ * @return A playlist. The reference is owned by the caller and should be released with sp_playlist_release()
+ *
+ */
+SP_LIBEXPORT(sp_playlist *) sp_playlist_create(sp_session *session, sp_link *link);
+
+/**
+ * Mark a playlist to be synchronized for offline playback.
+ * The playlist must be in the users playlistcontainer
+ *
+ * @param[in] session Session object
+ * @param[in] playlist Playlist object
+ * @param[in] offline True iff playlist should be offline, false otherwise
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_playlist_set_offline_mode(sp_session *session, sp_playlist *playlist, bool offline);
+
+/**
+ * Get offline status for a playlist
+ *
+ * @param[in] session Session object
+ * @param[in] playlist Playlist object
+ *
+ * @return sp_playlist_offline_status
+ *
+ * @see When in SP_PLAYLIST_OFFLINE_STATUS_DOWNLOADING mode the
+ * sp_playlist_get_offline_download_completed() method can be used to query
+ * progress of the download
+ */
+SP_LIBEXPORT(sp_playlist_offline_status) sp_playlist_get_offline_status(sp_session *session, sp_playlist *playlist);
+
+/**
+ * Get download progress for an offline playlist
+ *
+ * @param[in] session Session object
+ * @param[in] playlist Playlist object
+ *
+ * @return Value from 0 - 100 that indicates amount of playlist that is downloaded
+ * or 0 if the playlist is not in the SP_PLAYLIST_OFFLINE_STATUS_DOWNLOADING mode.
+ *
+ * @see sp_playlist_offline_status()
+ */
+SP_LIBEXPORT(int) sp_playlist_get_offline_download_completed(sp_session *session, sp_playlist *playlist);
+
+/**
+ * Increase the reference count of a playlist
+ *
+ * @param[in] playlist The playlist object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_playlist_add_ref(sp_playlist *playlist);
+
+/**
+ * Decrease the reference count of a playlist
+ *
+ * @param[in] playlist The playlist object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_playlist_release(sp_playlist *playlist);
+
+
+/**
+ * Playlist container callbacks.
+ * If some callbacks should not be of interest, set them to NULL.
+ *
+ * @see sp_playlistcontainer_add_callbacks
+ * @see sp_playlistcontainer_remove_callbacks
+ */
+typedef struct sp_playlistcontainer_callbacks {
+ /**
+ * Called when a new playlist has been added to the playlist container.
+ *
+ * @param[in] pc Playlist container
+ * @param[in] playlist Playlist object.
+ * @param[in] position Position in list
+ * @param[in] userdata Userdata as set in sp_playlistcontainer_add_callbacks()
+ */
+ void (SP_CALLCONV *playlist_added)(sp_playlistcontainer *pc, sp_playlist *playlist, int position, void *userdata);
+
+
+ /**
+ * Called when a new playlist has been removed from playlist container
+ *
+ * @param[in] pc Playlist container
+ * @param[in] playlist Playlist object.
+ * @param[in] position Position in list
+ * @param[in] userdata Userdata as set in sp_playlistcontainer_add_callbacks()
+ */
+ void (SP_CALLCONV *playlist_removed)(sp_playlistcontainer *pc, sp_playlist *playlist, int position, void *userdata);
+
+
+ /**
+ * Called when a playlist has been moved in the playlist container
+ *
+ * @param[in] pc Playlist container
+ * @param[in] playlist Playlist object.
+ * @param[in] position Previous position in playlist container list
+ * @param[in] new_position New position in playlist container list
+ * @param[in] userdata Userdata as set in sp_playlistcontainer_add_callbacks()
+ */
+ void (SP_CALLCONV *playlist_moved)(sp_playlistcontainer *pc, sp_playlist *playlist, int position, int new_position, void *userdata);
+
+ /**
+ * Called when the playlist container is loaded
+ *
+ * @param[in] pc Playlist container
+ * @param[in] userdata Userdata as set in sp_playlistcontainer_add_callbacks()
+ */
+ void (SP_CALLCONV *container_loaded)(sp_playlistcontainer *pc, void *userdata);
+} sp_playlistcontainer_callbacks;
+
+
+/**
+ * Register interest in changes to a playlist container
+ *
+ * @param[in] pc Playlist container
+ * @param[in] callbacks Callbacks, see sp_playlistcontainer_callbacks
+ * @param[in] userdata Opaque value passed to callbacks.
+ *
+ * @note Every sp_playlistcontainer_add_callbacks() needs to be paired with a corresponding
+ * sp_playlistcontainer_remove_callbacks() that is invoked before releasing the
+ * last reference you own for the container. In other words, you must make sure
+ * to have removed all the callbacks before the container gets destroyed.
+ *
+ * @sa sp_session_playlistcontainer()
+ * @sa sp_playlistcontainer_remove_callbacks
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_playlistcontainer_add_callbacks(sp_playlistcontainer *pc, sp_playlistcontainer_callbacks *callbacks, void *userdata);
+
+
+/**
+ * Unregister interest in changes to a playlist container
+ *
+ * @param[in] pc Playlist container
+ * @param[in] callbacks Callbacks, see sp_playlistcontainer_callbacks
+ * @param[in] userdata Opaque value passed to callbacks.
+ *
+ * @sa sp_session_playlistcontainer()
+ * @sa sp_playlistcontainer_add_callbacks
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_playlistcontainer_remove_callbacks(sp_playlistcontainer *pc, sp_playlistcontainer_callbacks *callbacks, void *userdata);
+
+/**
+ * Return the number of playlists in the given playlist container
+ *
+ * @param[in] pc Playlist container
+ *
+ * @return Number of playlists, -1 if undefined
+ *
+ * @sa sp_session_playlistcontainer()
+ */
+SP_LIBEXPORT(int) sp_playlistcontainer_num_playlists(sp_playlistcontainer *pc);
+
+/**
+ * Return true if the playlistcontainer is fully loaded
+ *
+ * @param[in] pc Playlist container
+ *
+ * @return True if container is loaded
+ *
+ * @note The container_loaded callback will be invoked when this flips to true
+ */
+SP_LIBEXPORT(bool) sp_playlistcontainer_is_loaded(sp_playlistcontainer *pc);
+
+/**
+ * Return a pointer to the playlist at a specific index
+ *
+ * @param[in] pc Playlist container
+ * @param[in] index Index in playlist container. Should be in the interval [0, sp_playlistcontainer_num_playlists() - 1]
+ *
+ * @return The playlist object
+ *
+ * @sa sp_session_playlistcontainer()
+ */
+SP_LIBEXPORT(sp_playlist *) sp_playlistcontainer_playlist(sp_playlistcontainer *pc, int index);
+
+/**
+ * Return the type of the playlist at a @a index
+ *
+ * @param[in] pc Playlist container
+ * @param[in] index Index in playlist container. Should be in the interval [0, sp_playlistcontainer_num_playlists() - 1]
+ *
+ * @return Type of the playlist, @see sp_playlist_type
+ *
+ * @sa sp_session_playlistcontainer()
+ */
+SP_LIBEXPORT(sp_playlist_type) sp_playlistcontainer_playlist_type(sp_playlistcontainer *pc, int index);
+
+/**
+ * Return the folder name at @a index
+ *
+ * @param[in] pc Playlist container
+ * @param[in] index Index in playlist container. Should be in the interval [0, sp_playlistcontainer_num_playlists() - 1].
+ * Index should point at a start-folder entry, otherwise the empty string is written to buffer.
+ * @param[in] buffer Pointer to char[] where to store folder name
+ * @param[in] buffer_size Size of array
+ *
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ * SP_ERROR_INDEX_OUT_OF_RANGE
+ *
+ * @sa sp_session_playlistcontainer()
+ */
+SP_LIBEXPORT(sp_error) sp_playlistcontainer_playlist_folder_name(sp_playlistcontainer *pc, int index, char *buffer, int buffer_size);
+
+/**
+ * Return the folder id at @a index
+ *
+ * @param[in] pc Playlist container
+ * @param[in] index Index in playlist container. Should be in the interval [0, sp_playlistcontainer_num_playlists() - 1]
+ *
+ * @return The group ID of the folder. Returns 0 on index out of range, pc being NULL or indexed item not being a folder
+ *
+ * @sa sp_session_playlistcontainer()
+ */
+SP_LIBEXPORT(sp_uint64) sp_playlistcontainer_playlist_folder_id(sp_playlistcontainer *pc, int index);
+
+/**
+ * Add an empty playlist at the end of the playlist container.
+ * The name must not consist of only spaces and it must be shorter than 256 characters.
+ *
+ * @param[in] pc Playlist container
+ * @param[in] name Name of new playlist
+ *
+ * @return Pointer to the new playlist. Can be NULL if the operation fails.
+ */
+SP_LIBEXPORT(sp_playlist *) sp_playlistcontainer_add_new_playlist(sp_playlistcontainer *pc, const char *name);
+
+/**
+ * Add an existing playlist at the end of the given playlist container
+ *
+ * @param[in] pc Playlist container
+ * @param[in] link Link object pointing to a playlist
+ *
+ * @return Pointer to the new playlist. Will be NULL if the playlist already exists.
+ */
+SP_LIBEXPORT(sp_playlist *) sp_playlistcontainer_add_playlist(sp_playlistcontainer *pc, sp_link *link);
+
+/**
+ * Remove playlist at index from the given playlist container
+ *
+ * @param[in] pc Playlist container
+ * @param[in] index Index of playlist to be removed
+ *
+ * @return error One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ * SP_ERROR_INDEX_OUT_OF_RANGE
+ */
+SP_LIBEXPORT(sp_error) sp_playlistcontainer_remove_playlist(sp_playlistcontainer *pc, int index);
+
+/**
+ * Move a playlist in the playlist container
+ *
+ * @param[in] pc Playlist container
+ * @param[in] index Index of playlist to be moved
+ * @param[in] new_position New position for the playlist
+ * @param[in] dry_run Do not execute the move, only check if it possible
+
+ * @return error One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ * SP_ERROR_INDEX_OUT_OF_RANGE
+ * SP_ERROR_INVALID_INDATA - If trying to move a folder into itself
+ */
+SP_LIBEXPORT(sp_error) sp_playlistcontainer_move_playlist(sp_playlistcontainer *pc, int index, int new_position, bool dry_run);
+
+
+/**
+ * Add a playlist folder
+ *
+ * @param[in] pc Playlist container
+ * @param[in] index Position of SP_PLAYLIST_TYPE_START_FOLDER entry
+ * @param[in] name Name of group
+
+ * @return error One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ * SP_ERROR_INDEX_OUT_OF_RANGE
+ *
+ * @note This operation will actually create two playlists. One of
+ * type SP_PLAYLIST_TYPE_START_FOLDER and immediately following a
+ * SP_PLAYLIST_TYPE_END_FOLDER one.
+ *
+ * To remove a playlist folder both of these must be deleted or the list
+ * will be left in an inconsistant state.
+ *
+ * There is no way to rename a playlist folder. Instead you need to remove
+ * the folder and recreate it again.
+ */
+SP_LIBEXPORT(sp_error) sp_playlistcontainer_add_folder(sp_playlistcontainer *pc, int index, const char *name);
+
+
+/**
+ * Return a pointer to the user object of the owner.
+ *
+ * @param[in] pc Playlist container.
+ * @return The user object or NULL if unknown or none.
+ */
+SP_LIBEXPORT(sp_user *) sp_playlistcontainer_owner(sp_playlistcontainer *pc);
+
+
+/**
+ * Increase reference count on playlistconatiner object
+ *
+ * @param[in] pc Playlist container.
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_playlistcontainer_add_ref(sp_playlistcontainer *pc);
+
+/**
+ * Release reference count on playlistconatiner object
+ *
+ * @param[in] pc Playlist container.
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_playlistcontainer_release(sp_playlistcontainer *pc);
+
+/**
+ * Get the number of new tracks in a playlist since the corresponding
+ * function sp_playlistcontainer_clear_unseen_tracks() was called. The
+ * function always returns the number of new tracks, and fills the
+ * \p tracks array with the new tracks, but not more than specified in
+ * \p num_tracks. The function will return a negative value on failure.
+ *
+ * @param[in] pc Playlist container.
+ * @param[in] playlist Playlist object.
+ * @param[out] tracks Array of pointer to new tracks (maybe NULL)
+ * @param[in] num_tracks Size of tracks array
+ * @return Returns the number of unseen tracks
+ */
+SP_LIBEXPORT(int) sp_playlistcontainer_get_unseen_tracks(sp_playlistcontainer *pc, sp_playlist *playlist, sp_track **tracks, int num_tracks);
+
+/**
+ * Clears a playlist from unseen tracks, so that next call to sp_playlistcontainer_get_unseen_tracks() will return 0 until a new track is added to the \p playslist.
+ *
+ * @param[in] pc Playlist container.
+ * @param[in] playlist Playlist object.
+ * @return Returns 0 on success and -1 on failure.
+ */
+SP_LIBEXPORT(int) sp_playlistcontainer_clear_unseen_tracks(sp_playlistcontainer *pc, sp_playlist *playlist);
+
+/** @} */
+
+
+/**
+ * @defgroup user User handling
+ * @{
+ */
+
+
+/**
+ * User relation type
+ */
+typedef enum sp_relation_type {
+ SP_RELATION_TYPE_UNKNOWN = 0, ///< Not yet known
+ SP_RELATION_TYPE_NONE = 1, ///< No relation
+ SP_RELATION_TYPE_UNIDIRECTIONAL = 2, ///< The currently logged in user is following this uer
+ SP_RELATION_TYPE_BIDIRECTIONAL = 3, ///< Bidirectional friendship established
+} sp_relation_type;
+
+
+
+/**
+ * Get a pointer to a string representing the user's canonical username.
+ *
+ * @param[in] user The Spotify user whose canonical username you would like a string representation of
+ *
+ * @return A string representing the canonical username.
+ */
+SP_LIBEXPORT(const char *) sp_user_canonical_name(sp_user *user);
+
+/**
+ * Get a pointer to a string representing the user's displayable username.
+ * If there is no difference between the canonical username and the display name,
+ * or if the library does not know about the display name yet, the canonical username will
+ * be returned.
+ *
+ * @param[in] user The Spotify user whose displayable username you would like a string representation of
+ *
+ * @return A string
+ */
+SP_LIBEXPORT(const char *) sp_user_display_name(sp_user *user);
+
+/**
+ * Get load status for a user object. Before it is loaded, only the user's canonical username
+ * is known.
+ *
+ * @param[in] user Spotify user object
+ *
+ * @return True if user object is loaded, otherwise false
+ */
+SP_LIBEXPORT(bool) sp_user_is_loaded(sp_user *user);
+
+
+/**
+ * Increase the reference count of an user
+ *
+ * @param[in] user The user object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_user_add_ref(sp_user *user);
+
+/**
+ * Decrease the reference count of an user
+ *
+ * @param[in] user The user object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_user_release(sp_user *user);
+
+/** @} */
+
+
+/**
+ * @defgroup toplist Toplist handling
+ * @{
+ */
+
+/**
+ * Toplist types
+ */
+typedef enum {
+ SP_TOPLIST_TYPE_ARTISTS = 0, ///< Top artists
+ SP_TOPLIST_TYPE_ALBUMS = 1, ///< Top albums
+ SP_TOPLIST_TYPE_TRACKS = 2, ///< Top tracks
+} sp_toplisttype;
+
+
+/**
+ * Convenience macro to create a toplist region. Toplist regions are ISO 3166-1
+ * country codes (in uppercase) encoded in an integer. There are also some reserved
+ * codes used to denote non-country regions. See sp_toplistregion
+ *
+ * Example: SP_TOPLIST_REGION('S', 'E') for Sweden
+ */
+#define SP_TOPLIST_REGION(a, b) ((a) << 8 | (b))
+
+/**
+ * Special toplist regions
+ */
+typedef enum {
+ SP_TOPLIST_REGION_EVERYWHERE = 0, ///< Global toplist
+ SP_TOPLIST_REGION_USER = 1, ///< Toplist for a given user
+} sp_toplistregion;
+
+
+/**
+ * The type of a callback used in sp_toplistbrowse_create()
+ *
+ * When the callback is called, the metadata of all tracks belonging to it will have
+ * been loaded, so sp_track_is_loaded() will return non-zero. The same goes for the
+ * similar toplist data.
+ *
+ * @param[in] result The same pointer returned by sp_toplistbrowse_create()
+ * @param[in] userdata The opaque pointer given to sp_toplistbrowse_create()
+ */
+typedef void SP_CALLCONV toplistbrowse_complete_cb(sp_toplistbrowse *result, void *userdata);
+
+/**
+ * Initiate a request for browsing an toplist
+ *
+ * The user is responsible for freeing the returned toplist browse using sp_toplistbrowse_release(). This can be done in the callback.
+ *
+ * @param[in] session Session object
+ * @param[in] type Type of toplist to be browsed. see the sp_toplisttype enum for possible values
+ * @param[in] region Region. see sp_toplistregion enum. Country specific regions are coded as two chars in an integer.
+ * Sweden would correspond to 'S' << 8 | 'E'
+ * @param[in] username If region is SP_TOPLIST_REGION_USER this specifies which user to get toplists for. NULL means the logged in user.
+ * @param[in] callback Callback to be invoked when browsing has been completed. Pass NULL if you are not interested in this event.
+ * @param[in] userdata Userdata passed to callback.
+ *
+ * @return Toplist browse object
+ *
+ * @see ::toplistbrowse_complete_cb
+ */
+SP_LIBEXPORT(sp_toplistbrowse *) sp_toplistbrowse_create(sp_session *session, sp_toplisttype type, sp_toplistregion region, const char *username, toplistbrowse_complete_cb *callback, void *userdata);
+
+
+/**
+ * Check if an toplist browse request is completed
+ *
+ * @param[in] tlb Toplist browse object
+ *
+ * @return True if browsing is completed, false if not
+ */
+SP_LIBEXPORT(bool) sp_toplistbrowse_is_loaded(sp_toplistbrowse *tlb);
+
+/**
+* Check if browsing returned an error code.
+*
+* @param[in] tlb Toplist browse object
+*
+* @return One of the following errors, from ::sp_error
+* SP_ERROR_OK
+* SP_ERROR_IS_LOADING
+* SP_ERROR_OTHER_PERMANENT
+* SP_ERROR_OTHER_TRANSIENT
+*/
+SP_LIBEXPORT(sp_error) sp_toplistbrowse_error(sp_toplistbrowse *tlb);
+
+
+
+/**
+ * Increase the reference count of an toplist browse result
+ *
+ * @param[in] tlb The toplist browse result object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_toplistbrowse_add_ref(sp_toplistbrowse *tlb);
+
+/**
+ * Decrease the reference count of an toplist browse result
+ *
+ * @param[in] tlb The toplist browse result object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_toplistbrowse_release(sp_toplistbrowse *tlb);
+
+/**
+ * Given an toplist browse object, return number of artists
+ *
+ * @param[in] tlb Toplist browse object
+ *
+ * @return Number of artists on toplist
+ */
+SP_LIBEXPORT(int) sp_toplistbrowse_num_artists(sp_toplistbrowse *tlb);
+
+/**
+ * Return the artist at the given index in the given toplist browse object
+ *
+ * @param[in] tlb Toplist object
+ * @param[in] index Index of the wanted artist. Should be in the interval [0, sp_toplistbrowse_num_artists() - 1]
+ *
+ * @return The artist at the given index in the given toplist browse object
+ */
+SP_LIBEXPORT(sp_artist *) sp_toplistbrowse_artist(sp_toplistbrowse *tlb, int index);
+
+
+/**
+ * Given an toplist browse object, return number of albums
+ *
+ * @param[in] tlb Toplist browse object
+ *
+ * @return Number of albums on toplist
+ */
+SP_LIBEXPORT(int) sp_toplistbrowse_num_albums(sp_toplistbrowse *tlb);
+
+
+/**
+ * Return the album at the given index in the given toplist browse object
+ *
+ * @param[in] tlb Toplist object
+ * @param[in] index Index of the wanted album. Should be in the interval [0, sp_toplistbrowse_num_albums() - 1]
+ *
+ * @return The album at the given index in the given toplist browse object
+ */
+SP_LIBEXPORT(sp_album *) sp_toplistbrowse_album(sp_toplistbrowse *tlb, int index);
+
+
+/**
+ * Given an toplist browse object, return number of tracks
+ *
+ * @param[in] tlb Toplist browse object
+ *
+ * @return Number of tracks on toplist
+ */
+SP_LIBEXPORT(int) sp_toplistbrowse_num_tracks(sp_toplistbrowse *tlb);
+
+
+/**
+ * Return the track at the given index in the given toplist browse object
+ *
+ * @param[in] tlb Toplist object
+ * @param[in] index Index of the wanted track. Should be in the interval [0, sp_toplistbrowse_num_tracks() - 1]
+ *
+ * @return The track at the given index in the given toplist browse object
+ */
+SP_LIBEXPORT(sp_track *) sp_toplistbrowse_track(sp_toplistbrowse *tlb, int index);
+
+/**
+ * Return the time (in ms) that was spent waiting for the Spotify backend to serve the request
+ *
+ * @param[in] tlb Toplist object
+ *
+ * @return -1 if the request was served from the local cache
+ * If the result is not yet loaded the return value is undefined
+ */
+SP_LIBEXPORT(int) sp_toplistbrowse_backend_request_duration(sp_toplistbrowse *tlb);
+
+
+/** @} */
+
+/**
+ * @defgroup inbox Inbox subsystem
+ * @{
+ */
+
+/**
+ * The type of a callback used in sp_inbox_post()
+ *
+ * When this callback is called, the sp_track_is_loaded(), sp_album_is_loaded(),
+ * and sp_artist_is_loaded() functions will return non-zero for the objects
+ * contained in the search result.
+ *
+ * @param[in] result The same pointer returned by sp_search_create()
+ * @param[in] userdata The opaque pointer given to sp_search_create()
+ */
+typedef void SP_CALLCONV inboxpost_complete_cb(sp_inbox *result, void *userdata);
+
+/**
+ * Add to inbox
+ *
+ * @param[in] session Session object
+ * @param[in] user Canonical username of recipient
+ * @param[in] tracks Array of tracks to post
+ * @param[in] num_tracks Number of tracks in \p tracks
+ * @param[in] message Message to attach to tracks. UTF-8
+ * @param[in] callback Callback to be invoked when the request has completed
+ * @param[in] userdata Userdata passed to callback
+ *
+ * @return sp_inbox object if the request has been sent, NULL if request failed to initialize
+ */
+SP_LIBEXPORT(sp_inbox *) sp_inbox_post_tracks(sp_session *session, const char *user, sp_track * const *tracks, int num_tracks, const char *message, inboxpost_complete_cb *callback, void *userdata);
+
+
+/**
+* Check if inbox operation returned an error code.
+*
+* @param[in] inbox Inbox object
+*
+* @return One of the following errors, from ::sp_error
+* SP_ERROR_OK
+* SP_ERROR_OTHER_TRANSIENT
+* SP_ERROR_PERMISSION_DENIED
+* SP_ERROR_INVALID_INDATA
+* SP_ERROR_INBOX_IS_FULL
+* SP_ERROR_NO_SUCH_USER
+* SP_ERROR_OTHER_PERMANENT
+*/
+SP_LIBEXPORT(sp_error) sp_inbox_error(sp_inbox *inbox);
+
+/**
+ * Increase the reference count of a inbox result
+ *
+ * @param[in] inbox The inbox result object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_inbox_add_ref(sp_inbox *inbox);
+
+/**
+ * Decrease the reference count of a inbox result
+ *
+ * @param[in] inbox The inbox result object
+ * @return One of the following errors, from ::sp_error
+ * SP_ERROR_OK
+ */
+SP_LIBEXPORT(sp_error) sp_inbox_release(sp_inbox *inbox);
+
+/** @} */
+
+/**
+ * Return the libspotify build ID
+ *
+ * This might be useful to have available for display somewhere in your
+ * user interface.
+ */
+SP_LIBEXPORT(const char *) sp_build_id(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* PUBLIC_API_H */
+/**
+ * @example browse.c
+ *
+ * The browse.c example shows how you can use the album, artist, and browse functions.
+ * The example also include some rudimentary playlist browsing.
+ * It is part of the spshell program
+ */
+/**
+ * @example search.c
+ *
+ * The search.c example shows how you can use search functions.
+ * It is part of the spshell program
+ */
+/**
+ * @example toplist.c
+ *
+ * The toplist.c example shows how you can use toplist functions.
+ * It is part of the spshell program
+ */
+/**
+ * @example jukebox.c
+ *
+ * The jukebox.c example shows how you can use playback and playlist functions.
+ */