Switch player to MPRIS interface
This commit is contained in:
parent
ec1548ec0f
commit
d9823bf0c8
5
go.mod
5
go.mod
@ -2,4 +2,7 @@ module go.arsenm.dev/infinitime
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go 1.16
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require github.com/muka/go-bluetooth v0.0.0-20211122080231-b99792bbe62a
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require (
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github.com/godbus/dbus/v5 v5.0.3
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github.com/muka/go-bluetooth v0.0.0-20211122080231-b99792bbe62a
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)
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37
internal/utils/dbus.go
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37
internal/utils/dbus.go
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@ -0,0 +1,37 @@
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package utils
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import "github.com/godbus/dbus/v5"
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func NewSystemBusConn() (*dbus.Conn, error) {
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// Connect to dbus session bus
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conn, err := dbus.SystemBusPrivate()
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if err != nil {
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return nil, err
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}
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err = conn.Auth(nil)
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if err != nil {
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return nil, err
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}
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err = conn.Hello()
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if err != nil {
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return nil, err
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}
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return conn, nil
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}
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func NewSessionBusConn() (*dbus.Conn, error) {
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// Connect to dbus session bus
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conn, err := dbus.SessionBusPrivate()
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if err != nil {
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return nil, err
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}
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err = conn.Auth(nil)
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if err != nil {
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return nil, err
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}
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err = conn.Hello()
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if err != nil {
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return nil, err
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}
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return conn, nil
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}
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224
pkg/player/player.go
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224
pkg/player/player.go
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@ -0,0 +1,224 @@
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package player
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import (
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"strings"
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"github.com/godbus/dbus/v5"
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"go.arsenm.dev/infinitime/internal/utils"
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)
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var (
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method, monitor *dbus.Conn
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monitorCh chan *dbus.Message
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)
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// Init makes required connections to DBis and
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// initializes change monitoring channel
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func Init() error {
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// Connect to session bus for monitoring
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monitorConn, err := utils.NewSessionBusConn()
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if err != nil {
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return err
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}
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// Add match rule for PropertiesChanged on media player
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monitorConn.AddMatchSignal(
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dbus.WithMatchObjectPath("/org/mpris/MediaPlayer2"),
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dbus.WithMatchInterface("org.freedesktop.DBus.Properties"),
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dbus.WithMatchMember("PropertiesChanged"),
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)
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monitorCh = make(chan *dbus.Message)
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monitorConn.Eavesdrop(monitorCh)
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// Connect to session bus for method calls
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methodConn, err := utils.NewSessionBusConn()
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if err != nil {
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return err
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}
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method, monitor = methodConn, monitorConn
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return nil
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}
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// Exit closes all connections and channels
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func Exit() {
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close(monitorCh)
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method.Close()
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monitor.Close()
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}
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// Play uses MPRIS to play media
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func Play() error {
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player, err := getPlayerObj()
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if err != nil {
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return err
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}
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if player != nil {
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call := player.Call("org.mpris.MediaPlayer2.Player.Play", 0)
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if call.Err != nil {
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return call.Err
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}
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}
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return nil
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}
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// Pause uses MPRIS to pause media
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func Pause() error {
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player, err := getPlayerObj()
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if err != nil {
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return err
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}
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if player != nil {
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call := player.Call("org.mpris.MediaPlayer2.Player.Pause", 0)
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if call.Err != nil {
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return call.Err
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}
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}
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return nil
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}
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// Next uses MPRIS to skip to next media
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func Next() error {
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player, err := getPlayerObj()
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if err != nil {
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return err
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}
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if player != nil {
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call := player.Call("org.mpris.MediaPlayer2.Player.Next", 0)
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if call.Err != nil {
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return call.Err
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}
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}
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return nil
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}
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// Prev uses MPRIS to skip to previous media
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func Prev() error {
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player, err := getPlayerObj()
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if err != nil {
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return err
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}
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if player != nil {
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call := player.Call("org.mpris.MediaPlayer2.Player.Previous", 0)
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if call.Err != nil {
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return call.Err
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}
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}
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return nil
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}
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type ChangeType int
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const (
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ChangeTypeTitle ChangeType = iota
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ChangeTypeArtist
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ChangeTypeAlbum
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ChangeTypeStatus
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)
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func (ct ChangeType) String() string {
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switch ct {
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case ChangeTypeTitle:
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return "Title"
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case ChangeTypeAlbum:
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return "Album"
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case ChangeTypeArtist:
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return "Artist"
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case ChangeTypeStatus:
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return "Status"
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}
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return ""
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}
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// OnChange runs cb when a value changes
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func OnChange(cb func(ChangeType, string)) {
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go func() {
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// For every message on channel
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for msg := range monitorCh {
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// Parse PropertiesChanged
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iface, changed, ok := parsePropertiesChanged(msg)
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if !ok || iface != "org.mpris.MediaPlayer2.Player" {
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continue
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}
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// For every property changed
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for name, val := range changed {
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// If metadata changed
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if name == "Metadata" {
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// Get fields
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fields := val.Value().(map[string]dbus.Variant)
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// For every field
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for name, val := range fields {
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// Handle each field appropriately
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if strings.HasSuffix(name, "title") {
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title := val.Value().(string)
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if title == "" {
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title = "Unknown " + ChangeTypeTitle.String()
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}
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cb(ChangeTypeTitle, title)
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} else if strings.HasSuffix(name, "album") {
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album := val.Value().(string)
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if album == "" {
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album = "Unknown " + ChangeTypeAlbum.String()
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}
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cb(ChangeTypeAlbum, album)
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} else if strings.HasSuffix(name, "artist") {
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artists := val.Value().([]string)
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artistStr := strings.Join(artists, ", ")
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if artistStr == "" {
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artistStr = "Unknown " + ChangeTypeArtist.String()
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}
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cb(ChangeTypeArtist, artistStr)
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}
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}
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} else if name == "PlaybackStatus" {
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// Handle status change
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cb(ChangeTypeStatus, val.Value().(string))
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}
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}
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}
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}()
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}
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// getPlayerNames gets all DBus MPRIS player bus names
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func getPlayerNames(conn *dbus.Conn) ([]string, error) {
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var names []string
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err := conn.BusObject().Call("org.freedesktop.DBus.ListNames", 0).Store(&names)
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if err != nil {
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return nil, err
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}
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var players []string
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for _, name := range names {
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if strings.HasPrefix(name, "org.mpris.MediaPlayer2") {
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players = append(players, name)
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}
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}
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return players, nil
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}
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// GetPlayerObj gets the object corresponding to the first
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// bus name found in DBus
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func getPlayerObj() (dbus.BusObject, error) {
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players, err := getPlayerNames(method)
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if err != nil {
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return nil, err
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}
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if len(players) == 0 {
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return nil, nil
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}
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return method.Object(players[0], "/org/mpris/MediaPlayer2"), nil
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}
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// parsePropertiesChanged parses a DBus PropertiesChanged signal
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func parsePropertiesChanged(msg *dbus.Message) (iface string, changed map[string]dbus.Variant, ok bool) {
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if len(msg.Body) != 3 {
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return "", nil, false
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}
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iface, ok = msg.Body[0].(string)
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if !ok {
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return
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}
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changed, ok = msg.Body[1].(map[string]dbus.Variant)
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if !ok {
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return
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}
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return
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}
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@ -1,112 +0,0 @@
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package player
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import (
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"bufio"
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"io"
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"os/exec"
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"strings"
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)
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// Play uses playerctl to play media
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func Play() error {
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return exec.Command("playerctl", "play").Run()
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}
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// Pause uses playerctl to pause media
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func Pause() error {
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return exec.Command("playerctl", "pause").Run()
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}
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// Next uses playerctl to skip to next media
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func Next() error {
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return exec.Command("playerctl", "next").Run()
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}
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// Prev uses playerctl to skip to previous media
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func Prev() error {
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return exec.Command("playerctl", "previous").Run()
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}
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// Metadata uses playerctl to detect music metadata changes
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func Metadata(key string, onChange func(string)) error {
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// Execute playerctl command with key and follow flag
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cmd := exec.Command("playerctl", "metadata", key, "-F")
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// Get stdout pipe
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stdout, err := cmd.StdoutPipe()
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if err != nil {
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return err
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}
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go func() {
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for {
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// Read line from command stdout
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line, _, err := bufio.NewReader(stdout).ReadLine()
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if err == io.EOF {
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continue
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}
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// Convert line to string
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data := string(line)
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// If key unknown, return suitable default
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if data == "No player could handle this command" || data == "" {
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data = "Unknown " + strings.Title(key)
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}
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// Run the onChange callback
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onChange(data)
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}
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}()
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// Start command asynchronously
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err = cmd.Start()
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if err != nil {
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return err
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}
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return nil
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}
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func Status(onChange func(bool)) error {
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// Execute playerctl status with follow flag
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cmd := exec.Command("playerctl", "status", "-F")
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// Get stdout pipe
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stdout, err := cmd.StdoutPipe()
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if err != nil {
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return err
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}
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go func() {
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for {
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// Read line from command stdout
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line, _, err := bufio.NewReader(stdout).ReadLine()
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if err == io.EOF {
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continue
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}
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// Convert line to string
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data := string(line)
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// Run the onChange callback
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onChange(data == "Playing")
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}
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}()
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// Start command asynchronously
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err = cmd.Start()
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if err != nil {
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return err
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}
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return nil
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}
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func CurrentMetadata(key string) (string, error) {
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out, err := exec.Command("playerctl", "metadata", key).Output()
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if err != nil {
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return "", err
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}
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data := string(out)
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if data == "No player could handle this command" || data == "" {
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data = "Unknown " + strings.Title(key)
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}
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return data, nil
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}
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func CurrentStatus() (bool, error) {
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out, err := exec.Command("playerctl", "status").Output()
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if err != nil {
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return false, err
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}
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data := string(out)
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return data == "Playing", nil
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}
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