LyricsFetcher - The Easiest Way to Find Lyrics for your Songs

/*
 * This file holds the class implementations necessary to interact with Window Media Library.
 *
 * Author: Phillip Piper
 * Date: 2009-02-06 4:28 PM
 *
 * CHANGE LOG:
 * 2009-03-14 JPP  Changed to use MetaDataEditor to update lyrics
 * 2009-02-06 JPP  Initial Version
 */

using System;
using System.ComponentModel;
using System.Runtime.InteropServices;

using WMPLib;

namespace LyricsFetcher
{
    /// <summary>
    /// This song library knows how to manipulate a WindowMediaPlayer
    /// database. 
    /// </summary>
    public class WmpLibrary : SongLibrary
    {
        protected override SongLoader ChooseSongLoader() {
            return new WmpSongLoader();
        }

        /// <summary>
        /// Close this library
        /// </summary>
        public override void Close() {
            // WMP is embedded in our program, so if we close the library, we 
            // have to stop playing any current songs, otherwise the user has no
            // way to stop the music.
            this.StopPlaying();
            base.Close();
        }

        /// <summary>
        /// Is the given song currently playing
        /// </summary>
        /// <param name="song">The song to check</param>
        /// <returns>Is the given song playing</returns>
        public override bool IsPlaying(Song song)
        {
            WmpSong wmpSong = song as WmpSong;
            if (wmpSong == null)
                return false;

            if (Wmp.Instance.Player.playState != WMPPlayState.wmppsPlaying)
                return false;

            return Wmp.Instance.Player.currentMedia.get_isIdentical(wmpSong.Media);
        }

        /// <summary>
        /// Start the given song playing
        /// </summary>
        /// <param name="song">The song to play</param>
        public override void Play(Song song)
        {
            WmpSong wmpSong = song as WmpSong;
            if (wmpSong != null) {
                Wmp.Instance.Player.currentPlaylist.appendItem(wmpSong.Media);
                Wmp.Instance.Player.controls.playItem(wmpSong.Media);
            }
        }

        /// <summary>
        /// Stop playing any song
        /// </summary>
        public override void StopPlaying()
        {
            Wmp.Instance.Player.controls.stop();
        }

        #region Event handlers

        /// <summary>
        /// Initialize all events required for this library
        /// </summary>
        public override void InitializeEvents()
        {
            Wmp.Instance.Player.PlayStateChange += new _WMPOCXEvents_PlayStateChangeEventHandler(PlayerPlayStateChange);
        }

        /// <summary>
        /// Stop listening for events on this library
        /// </summary>
        public override void DeinitializeEvents()
        {
            Wmp.Instance.Player.PlayStateChange -= new _WMPOCXEvents_PlayStateChangeEventHandler(PlayerPlayStateChange);
        }

        void PlayerPlayStateChange(int NewState) {
            this.OnPlayEvent(new EventArgs());
        }

        #endregion
    }

    public class WmpSongLoader : SongLoader
    {
        protected override object DoWork(DoWorkEventArgs e) {
            try {
                IWMPPlaylist tracks = Wmp.Instance.AllTracks;

                // How many tracks are there and how many songs should we fetch?
                int trackCount = tracks.count;
                int maxSongs = trackCount;
                if (this.MaxSongsToFetch > 0)
                    maxSongs = Math.Min(trackCount, this.MaxSongsToFetch);

                this.ReportProgress(0, "Gettings songs...");
                for (int i = 0; i < trackCount && this.Songs.Count < maxSongs && this.CanContinueRunning; i++) {

                    IWMPMedia track = tracks.get_Item(i);
                    this.AddSong(new WmpSong(track));

                    this.ReportProgress((i * 100) / maxSongs);
                }
            }
            catch (COMException ex) {
                // If the server died or stalled during the load, just ignore it
                if (!(((uint)ex.ErrorCode) == 0x80010007 || ((uint)ex.ErrorCode) == 0x8001010A))
                    throw ex;
            }
            return true;
        }
    }
}