public void CreateCurrentSongImage(AudioFile audioFile)
{
try
{
int bytesPerSample = 0;
WaveStream reader;
switch (audioFile.Format.ToLower())
{
case ".mp3":
reader = new Mp3FileReader(audioFile.Path);
break;
case ".wav":
reader = new WaveFileReader(audioFile.Path);
break;
case ".aiff":
reader = new AiffFileReader(audioFile.Path);
break;
default:
reader = new AudioFileReader(audioFile.Path);
break;
}
using (NAudio.Wave.WaveChannel32 channelStream = new NAudio.Wave.WaveChannel32(reader))
{
//initialize the progress bar, once the audio stream has been created
_progBar.Maximum = (int)reader.TotalTime.TotalMilliseconds / _visEventTimer.Interval;
bytesPerSample = (reader.WaveFormat.BitsPerSample / 8) * channelStream.WaveFormat.Channels;
//Give a size to the bitmap; either a fixed size, or something based on the length of the audio
using (Bitmap bitmap = new Bitmap((int)Math.Round(reader.TotalTime.TotalSeconds * 80), 300))
{
int width = bitmap.Width;
int height = bitmap.Height;
using (Graphics graphics = Graphics.FromImage(bitmap))
{
graphics.Clear(Color.White);
Pen bluePen = new Pen(Color.Blue);
int samplesPerPixel = (int)(reader.Length / (double)(width * bytesPerSample));
int bytesPerPixel = bytesPerSample * samplesPerPixel;
int bytesRead;
byte[] waveData = new byte[bytesPerPixel];
for (float x = 0; x < width; x++)
{
bytesRead = reader.Read(waveData, 0, bytesPerPixel);
if (bytesRead == 0)
{
break;
}
short low = 0;
short high = 0;
for (int n = 0; n < bytesRead; n += 2)
{
short sample = BitConverter.ToInt16(waveData, n);
if (sample < low)
{
low = sample;
}
if (sample > high)
{
high = sample;
}
}
float lowPercent = ((((float)low) - short.MinValue) / ushort.MaxValue);
float highPercent = ((((float)high) - short.MinValue) / ushort.MaxValue);
float lowValue = height * lowPercent;
float highValue = height * highPercent;
graphics.DrawLine(bluePen, x, lowValue, x, highValue);
}
}
_currentSongImage = new System.Drawing.Bitmap(bitmap);
bitmap.Dispose();
}
}
reader.Dispose();
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
