//initPlay(): plays the loaded music file, this method is to be used only when the file is fresh in the MCI device (not paused)
private bool initPlay()
{
if (loadedPlaylist.Count == 0)
{
errorMsg = "initPlay(): loaded playlist is empty.";
return(false);
}
Track t = loadedPlaylist.SelectedTrack;
if (loadFile(t.Path))
{
mciCommand = "play MediaFile";
rflag = MusicFileInfo.mciSendString(mciCommand, mciReturn, mciReturn.Capacity, IntPtr.Zero);
if (rflag == 0)
{
setVolume(volume);
playing = true;
return(true);
}
close();
MusicFileInfo.mciGetErrorString(rflag, mciReturn, mciReturn.Capacity);
errorMsg = "initPlay(): mci play command failed -> " + mciReturn.ToString();
return(false);
}
return(false);
}
//close(): closes MCI device
private void close()
{
mciCommand = "close MediaFile";
MusicFileInfo.mciSendString(mciCommand, null, 0, IntPtr.Zero);
paused = false;
playing = false;
}
//loadFile(): initializes the MCI device with the desired music file
private bool loadFile(string path)
{
if (seeked)
{
seeked = false;
return(true);
}
close();
//try to open as mpegvideo
mciCommand = "open \"" + path +
"\" type mpegvideo alias MediaFile";
rflag = MusicFileInfo.mciSendString(mciCommand, mciReturn, mciReturn.Capacity, IntPtr.Zero);
if (rflag != 0)
{
// Let MCI decide which file type the song is
mciCommand = "open \"" + path +
"\" alias MediaFile";
rflag = MusicFileInfo.mciSendString(mciCommand, mciReturn, mciReturn.Capacity, IntPtr.Zero);
if (rflag == 0)
{
return(true);
}
else
{
MusicFileInfo.mciGetErrorString(rflag, mciReturn, mciReturn.Capacity);
errorMsg = "loadFile(): mci open command failed -> " + mciReturn.ToString();
return(false);
}
}
else
{
return(true);
}
}
//getCurrentPosition(): gets the current position in ms of the currently playing music track
//returns -1 on errors
public int getCurrentPosition()
{
if (loadedPlaylist.Count == 0)
{
return(0);
}
mciCommand = "status MediaFile position";
rflag = MusicFileInfo.mciSendString(mciCommand, mciReturn, mciReturn.Capacity, IntPtr.Zero);
if (rflag == 0)
{
if (mciReturn.Length == 0)
{
return(0);
}
try
{
int c = int.Parse(mciReturn.ToString());
if (c > SelectedTrack.Length)
{
return(SelectedTrack.Length);
}
return(c);
}
catch (Exception e)
{
errorMsg = "getCurrentPosition(): return string:" + mciReturn.ToString() + " exception:" + e.Message;
return(-1);
}
}
MusicFileInfo.mciGetErrorString(rflag, mciReturn, mciReturn.Capacity);
errorMsg = "getCurrentPosition(): mci status command failed -> " + mciReturn.ToString();
return(-1);
}
//setPosition(): seeks into a desired position in ms of the currently selected track
public bool setPosition(int ms)
{
if (ms < 0 || ms > getTrackLength())
{
errorMsg = "setPosition(): desired position out of range";
return(false);
}
if (playing)
{
mciCommand = "play MediaFile from " + ms.ToString();
}
else
{
mciCommand = "seek MediaFile to " + ms.ToString();
paused = false;
seeked = true;
}
rflag = MusicFileInfo.mciSendString(mciCommand, mciReturn, mciReturn.Capacity, IntPtr.Zero);
if (rflag == 0)
{
return(true);
}
MusicFileInfo.mciGetErrorString(rflag, mciReturn, mciReturn.Capacity);
errorMsg = "setPosition(): mci play/seek command failed -> " + mciReturn.ToString();
return(false);
}
//getTrackLength(): gets the length in ms of the currently selected track in the playlist
//returns -1 on errors
public int getTrackLength()
{
if (loadedPlaylist.Count == 0)
{
errorMsg = "getTrackLength(): loaded playlist is empty";
return(-1);
}
if (loadedPlaylist.SelectedTrack.Length <= 0)
{
mciCommand = "status MediaFile length";
rflag = MusicFileInfo.mciSendString(mciCommand, mciReturn, mciReturn.Capacity, IntPtr.Zero);
if (rflag == 0)
{
if (mciReturn.Length == 0)
{
return(0);
}
try
{
int l = int.Parse(mciReturn.ToString());
return(l);
}
catch (Exception e)
{
errorMsg = "getTrackLength(): return string:" + mciReturn.ToString() + " exception:" + e.Message;
return(-1);
}
}
MusicFileInfo.mciGetErrorString(rflag, mciReturn, mciReturn.Capacity);
errorMsg = "getTrackLength(): mci status command failed -> " + mciReturn.ToString();
return(-1);
}
return(loadedPlaylist.SelectedTrack.Length);
}
private void validateFileFormat_throws()//throws exception if file type is not supported
{
if (!MusicFileInfo.isCorrectFormat(path))
{
error_msg = MusicFileInfo.error_msg;
throw new FileFormatNotSupported(error_msg);
}
}
//stop(): stops the currently playing file
public bool stop()
{
mciCommand = "stop MediaFile";
rflag = MusicFileInfo.mciSendString(mciCommand, mciReturn, mciReturn.Capacity, IntPtr.Zero);
if (rflag == 0)
{
paused = false;
playing = false;
close();
return(true);
}
MusicFileInfo.mciGetErrorString(rflag, mciReturn, mciReturn.Capacity);
errorMsg = "stop(): mci stop command failed -> " + mciReturn.ToString();
return(false);
}
//setVolume(): sets the volume of the MCI device
public bool setVolume(int v)
{
if (v >= 0 || v <= 1000)
{
this.volume = v;
mciCommand = "setaudio MediaFile volume to " + volume.ToString();
rflag = MusicFileInfo.mciSendString(mciCommand, mciReturn, mciReturn.Capacity, IntPtr.Zero);
if (rflag == 0)
{
return(true);
}
MusicFileInfo.mciGetErrorString(rflag, mciReturn, mciReturn.Capacity);
errorMsg = "setVolume(): mci setaudio command failed -> " + mciReturn.ToString();
return(false);
}
errorMsg = "setVolume(): desired volume out of range";
return(false);
}
//resume(): public method used to play music tracks
//this method should be used to toggle play/resume button
public bool resume()
{
if (paused)
{
mciCommand = "resume MediaFile";
rflag = MusicFileInfo.mciSendString(mciCommand, mciReturn, mciReturn.Capacity, IntPtr.Zero);
if (rflag == 0)
{
paused = false;
playing = true;
return(true);
}
MusicFileInfo.mciGetErrorString(rflag, mciReturn, mciReturn.Capacity);
errorMsg = "resume(): mci resume command failed -> " + mciReturn.ToString();
return(false);
}
return(initPlay());
}
public bool pause()
{
if (playing)
{
mciCommand = "pause MediaFile";
rflag = MusicFileInfo.mciSendString(mciCommand, mciReturn, mciReturn.Capacity, IntPtr.Zero);
if (rflag == 0)
{
playing = false;
paused = true;
return(true);
}
MusicFileInfo.mciGetErrorString(rflag, mciReturn, mciReturn.Capacity);
errorMsg = "pause(): mci pause command failed -> " + mciReturn.ToString();
return(false);
}
errorMsg = "pause(): no music playing";
return(false);
}
private bool fixLength()
{
this.length = MusicFileInfo.getLength(path);
if (length < 0)
{
if (this.Format.Equals("MP3"))
{
try
{
this.length = (int)new NAudio.Wave.Mp3FileReader(path).TotalTime.TotalMilliseconds;
}
catch (Exception e)
{
this.length = 0;
}
}
else if (this.Format.Equals("WAV"))
{
try
{
this.length = (int)new NAudio.Wave.WaveFileReader(path).TotalTime.TotalMilliseconds;
}
catch (Exception e)
{
this.length = 0;
}
}
if (this.length < 0)
{
error_msg = MusicFileInfo.error_msg;
return(false);
}
}
return(true);
}
