/// <summary>
/// The BackgroundWorker_DoWork.
/// </summary>
/// <param name="sender">The sender<see cref="object"/>.</param>
/// <param name="e">The e<see cref="DoWorkEventArgs"/>.</param>
private void BackgroundWorker_DoWork(object sender, DoWorkEventArgs e)
{
progress = 0.0;
// loop through selected ACM items
foreach (int index in chkListBox.CheckedIndices)
{
if (this.IsDisposed)
{
break;
}
ACM acm = acms[index];
acm.WaveStream.Position = 0; // important! - always read stream from position 0.
WaveFormat outWaveFormat = new WaveFormat(); // output format: 16bit, 44.1 kHz
// Input is 16bit, 22050 Hz
WaveFormatConversionStream waveFormatConversionStream = new WaveFormatConversionStream(outWaveFormat, acm.WaveStream);
int li = acm.Tag.LastIndexOf('.'); // last index of dot; point is to remove extension to add the new one
string outFile = outDir + Path.DirectorySeparatorChar + acm.Tag.Substring(0, li + 1) + audioFormat.ToString().ToLower();
switch (audioFormat)
{
case AudioFormat.AAC:
MediaFoundationApi.Startup();
MediaFoundationEncoder.EncodeToAac(waveFormatConversionStream, outFile);
MediaFoundationApi.Shutdown();
break;
case AudioFormat.MP3:
MediaFoundationApi.Startup();
MediaFoundationEncoder.EncodeToMp3(waveFormatConversionStream, outFile);
MediaFoundationApi.Shutdown();
break;
case AudioFormat.WAV:
using (waveFormatConversionStream)
{
WaveFileWriter.CreateWaveFile(outFile, waveFormatConversionStream);
}
break;
}
progress += 100.0 / (double)chkListBox.CheckedItems.Count;
backgroundWorker.ReportProgress((int)progress);
}
progress = 100.0;
}
/// <summary>
/// The ListBox_SelectedIndexChanged.
/// </summary>
/// <param name="sender">The sender<see cref="object"/>.</param>
/// <param name="e">The e<see cref="EventArgs"/>.</param>
private void ListBox_SelectedIndexChanged(object sender, EventArgs e)
{
int index = listBox.SelectedIndex;
if (index != -1)
{
if (wo.PlaybackState != PlaybackState.Stopped)
{
wo.Stop();
}
ACM acm = acms[index];
if (acm.WaveStream != null && wo.PlaybackState == PlaybackState.Stopped)
{
acm.WaveStream.Position = 0;
wo.Init(acm.WaveStream);
}
}
}
/// <summary>
/// The BtnPlay_Click.
/// </summary>
/// <param name="sender">The sender<see cref="object"/>.</param>
/// <param name="e">The e<see cref="EventArgs"/>.</param>
private void BtnPlay_Click(object sender, EventArgs e)
{
if (wo.PlaybackState != PlaybackState.Paused)
{
wo.Stop();
}
int index = listBox.SelectedIndex;
if (index != -1)
{
ACM acm = acms[index];
if (acm.WaveStream != null &&
acm.WaveStream.Position == acm.WaveStream.Length)
{
acm.WaveStream.Position = 0;
}
if (wo.PlaybackState != PlaybackState.Playing)
{
wo.Play();
}
}
}