private FileStream _fileStream;
private long _waveDataPosition;
private long _lastSampleIndex;
private BinaryReader _binaryReader;
private SoundPlayer _wavPlayer;
private DateTime _waveStartTime;
private int _samplePerSecond;
private int _sampleSize;
private readonly List<int> _waveSamples = new List<int>();
private void btnWaveAudio_Click(object sender, EventArgs e)
{
var filePath = @"E:\Mp3\WAV\Khabari Hast (128).wav";
_fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);
_binaryReader = new BinaryReader(_fileStream);
var chunkId = _binaryReader.ReadInt32();
if (chunkId != 0x46464952) // RIFF
{
throw new Exception("Invalid file format!");
}
var fileSize = _binaryReader.ReadInt32();
var riffType = _binaryReader.ReadInt32();
while (_fileStream.Position <= _fileStream.Length - 8)
{
var subId = _binaryReader.ReadInt32();
var subSize = _binaryReader.ReadInt32();
var nextPos = _fileStream.Position + subSize;
var channels = 0;
switch (subId)
{
case 0x20746D66: //fmt
var fmtCode = _binaryReader.ReadInt16();
if (fmtCode != 1) //pcm
{
throw new Exception("Audio format must be PCM!");
}
channels = _binaryReader.ReadInt16();
var sampleRate = _binaryReader.ReadInt32();
var fmtAvgBps = _binaryReader.ReadInt32();
var fmtBlockAlign = _binaryReader.ReadInt16();
var bitDepth = _binaryReader.ReadInt16();
if (bitDepth != 16)
{
throw new Exception("Samples must be 16-bit!");
}
_sampleSize = bitDepth / 8;
_samplePerSecond = sampleRate * channels;
break;
case 0x61746164: //data
_waveDataPosition = _fileStream.Position;
_lastSampleIndex = subSize / _sampleSize - channels;
break;
}
_fileStream.Position = nextPos;
}
////////////////////////////////////////
_wavPlayer = new SoundPlayer(File.OpenRead(filePath));
_wavPlayer.LoadCompleted += new AsyncCompletedEventHandler(this.wavPlayer_LoadCompleted);
_wavPlayer.LoadAsync();
}
private void wavPlayer_LoadCompleted(object sender, AsyncCompletedEventArgs e)
{
_waveStartTime = DateTime.Now;
_wavPlayer.Play();
var tmrWav = new System.Windows.Forms.Timer();
tmrWav.Enabled = true;
tmrWav.Interval = 25; // 40 fps
tmrWav.Tick += new EventHandler(this.tmrWav_Tick);
this.tmrWav_Tick(tmrWav, new EventArgs());
}
private void tmrWav_Tick(object sender, EventArgs e)
{
// AllWavHeaderData WaveDatas 25 ms
var curTime = DateTime.Now;
var elaspedWavTimeSec = curTime.Subtract(this._waveStartTime).TotalSeconds;
var sampleIndex = (int)Math.Round(_samplePerSecond * elaspedWavTimeSec * _sampleSize) / _sampleSize;
if (sampleIndex >= _lastSampleIndex)
{
var tmrWav = (System.Windows.Forms.Timer)sender;
tmrWav.Enabled = false;
_binaryReader.Close();
return;
}
_fileStream.Position = _waveDataPosition + sampleIndex * _sampleSize;
var sample = _binaryReader.ReadInt16();
var sampleY = this.panelCustDanceLight.Height / 2 - (int)(panelCustDanceLight.Height / 2f * sample / short.MaxValue);
if (_waveSamples.Count >= panelCustDanceLight.Width / 2)
{
_waveSamples.RemoveAt(0);
}
_waveSamples.Add(sampleY);
this.panelCustDanceLight.Invalidate();
}
private void panelCustDanceLight_Paint(object sender, PaintEventArgs e)
{
e.Graphics.DrawLine(Pens.DarkGreen, 0, panelCustDanceLight.Height / 2, panelCustDanceLight.Width, panelCustDanceLight.Height / 2);
for (var i = 1; i < _waveSamples.Count; i++)
{
var x = i * 2;
e.Graphics.DrawLine(Pens.Blue, x - 2, _waveSamples[i - 1], x, _waveSamples[i]);
}
}
