// Draw the waveform in a graphics
// TODO: handle other bit depths than 16 bit.
private void DrawWaveform(Graphics g, AudioBlock block)
{
PCMFormatInfo format = this.audio.getPCMFormat();
if (format.getBitDepth() != 16)
{
throw new Exception("Cannot deal with bitdepth others than 16.");
}
ushort channels = format.getNumberOfChannels();
ushort frameSize = format.getBlockAlign();
int samplesPerPixel = (int)Math.Ceiling(this.audio.getPCMLength() / (float)frameSize / Width * channels);
int bytesPerPixel = samplesPerPixel * frameSize / channels;
byte[] bytes = new byte[bytesPerPixel];
short[] samples = new short[samplesPerPixel];
System.IO.Stream au = this.audio.getAudioData();
for (int x = 0; x < Width; ++x)
{
int read = au.Read(bytes, 0, bytesPerPixel);
Buffer.BlockCopy(bytes, 0, samples, 0, read);
DrawChannel(g, block.Highlighted ? block.Colors.WaveformChannelSelectedPen :
channels == 1 ? block.Colors.WaveformMonoPen : block.Colors.WaveformChannel1Pen,
samples, x, read, frameSize, 0, channels);
if (channels == 2)
{
DrawChannel(g, block.Selected ? block.Colors.WaveformChannelSelectedPen : block.Colors.WaveformChannel2Pen,
samples, x, read, frameSize, 1, channels);
}
}
au.Close();
}
// Repaint the waveform bitmap.
protected override void OnPaint(PaintEventArgs pe)
{
if (this.bitmap != null)
{
pe.Graphics.DrawImage(this.bitmap, new Point(0, 0));
}
AudioBlock block = Parent as AudioBlock;
if (block != null)
{
AudioSelection selection = block.Selection as AudioSelection;
if (selection != null)
{
int from = block.XForTime(selection.From);
if (selection.IsRange)
{
int to = block.XForTime(selection.To);
pe.Graphics.FillRectangle(block.Colors.AudioSelectionBrush,
new Rectangle(from < to ? from : to, 0, from < to ? to - from : from - to, Height));
pe.Graphics.DrawLine(block.Colors.AudioSelectionPen, new Point(to, 0), new Point(to, Height - 1));
}
pe.Graphics.DrawLine(block.Colors.AudioSelectionPen, new Point(from, 0), new Point(from, Height - 1));
}
if (block.Playing)
{
int at = block.XForTime(block.PlayingTime);
pe.Graphics.DrawLine(block.Colors.AudioPlaybackPen, new Point(at, 0), new Point(at, Height - 1));
}
}
base.OnPaint(pe);
}
private delegate void ClearProjectDelegate(); // delegate for thread-safe clearing
/// <summary>
/// New project view
/// </summary>
public ProjectView()
{
InitializeComponent();
DoubleBuffered = true;
Project = null;
this.clipboard = null;
this.selection = null;
this.playbackBlock = null;
AudioScale = 1.0;
Zoom = 1.0;
}
// Redraw the waveform to fit the available size.
private void UpdateWaveform(AudioBlock block)
{
if (Width > 0 && Height > 0 && block != null && block.Parent != null)
{
this.bitmap = new Bitmap(Width, Height);
Graphics g = Graphics.FromImage(this.bitmap);
g.Clear(BackColor);
g.DrawLine(block.Selected ? block.Colors.WaveformBaseLineSelectedPen : block.Colors.WaveformBaseLinePen,
new Point(0, Height / 2), new Point(Width - 1, Height / 2));
if (this.audio != null)
{
DrawWaveform(g, block);
}
Invalidate();
}
}
protected override void OnPaint(PaintEventArgs pe)
{
AudioBlock block = Parent as AudioBlock;
if (block != null)
{
AudioSelection selection = block.Selection as AudioSelection;
if (selection != null)
{
int from = block.XForTime(selection.From < selection.To ? selection.From : selection.To);
int to = block.XForTime(selection.To > selection.From ? selection.To : selection.From);
if (selection.IsRange)
{
pe.Graphics.FillRectangle(block.Colors.AudioSelectionBrush, new Rectangle(from, 0, to - from + 1, Height));
}
else
{
pe.Graphics.FillRectangle(block.Colors.AudioSelectionBrush,
new Rectangle(block.XForTime(selection.At) - Height / 2, 0, Height, Height));
}
}
if (block.Playing)
{
int at = block.XForTime(block.PlayingTime);
Point[] points = new Point[3];
points[0] = new Point(at, 0);
points[1] = new Point(at + Height / 2, Height / 2);
points[2] = new Point(at, Height);
pe.Graphics.DrawLine(block.Colors.AudioPlaybackPen, new Point(at, 0), new Point(at, Height));
pe.Graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
pe.Graphics.FillPolygon(block.Colors.AudioPlaybackBrush, points);
}
}
// Calling the base class OnPaint
base.OnPaint(pe);
}
/// <summary>
/// Add a new audio block to the track.
/// </summary>
public void AddAudioBlock(AudioBlock block)
{
block.Colors = ((ProjectView)Parent).Colors;
this.trackLayout.Controls.Add(block);
}
