public static double GetAdjustedAudioLength(double length, decimal sourceBpm, decimal targetBpm)
{
var sourceLoopLength = BpmHelper.GetDefaultLoopLength(sourceBpm);
var repeatsPerLoop = Math.Round(sourceLoopLength / length, 0);
return(GetDefaultLoopLength(targetBpm) / repeatsPerLoop);
}
/// <summary>
/// Saves a shortened version the specified sample as a mono wave in the Scratch folder and launches Scratch
/// </summary>
/// <param name="sample">The sample.</param>
public static void LaunchShort(Sample sample)
{
if (_applicationFolder == "")
{
return;
}
SilenceHelper.GenerateSilenceAudioFile(GetSilenceFilename());
SaveSample(sample);
var bpm = BpmHelper.GetBpmFromLoopLength(sample.LengthSeconds);
var loopLength = BpmHelper.GetDefaultLoopLength(bpm);
var shortLength = loopLength / 8;
if (shortLength > sample.LengthSeconds)
{
shortLength = sample.LengthSeconds;
}
var gain = GetGain(sample.Filename);
var scratchFilePath = Path.Combine(_applicationFolder, ScratchFile);
AudioExportHelper.SaveAsMonoWave(sample.Filename, scratchFilePath, shortLength, gain);
var scratchExePath = Path.Combine(_applicationFolder, ScratchExe);
Process.Start(scratchExePath);
}
/// <summary>
/// Does an audio stream power down effect asynchronously
/// </summary>
/// <param name="audioStream">The audio stream.</param>
private static void PowerDownAsync(AudioStream audioStream)
{
if (audioStream == null || !audioStream.IsAudioLoaded())
{
return;
}
var freq = audioStream.DefaultSampleRate;
var interval = (int)(BpmHelper.GetDefaultLoopLength(audioStream.Bpm) * 1000) / 128;
// set the volume slide
//lock (Lock)
{
Bass.BASS_ChannelSlideAttribute(audioStream.ChannelId, BASSAttribute.BASS_ATTRIB_VOL, 0F, interval * 8);
Thread.Sleep(1);
}
var percentValue = 0.70;
while (freq > 100)
{
percentValue = percentValue / 1.2;
interval = (int)(interval * 0.9D);
freq = (int)(audioStream.DefaultSampleRate * percentValue);
if (freq <= 100 || audioStream.ChannelId == int.MinValue)
{
continue;
}
//lock (Lock)
{
Bass.BASS_ChannelSlideAttribute(audioStream.ChannelId, BASSAttribute.BASS_ATTRIB_FREQ, freq, interval);
Thread.Sleep(1);
}
Thread.Sleep(interval);
}
Pause(audioStream);
if (!audioStream.IsAudioLoaded())
{
return;
}
//lock (Lock)
{
Bass.BASS_ChannelSetAttribute(audioStream.ChannelId, BASSAttribute.BASS_ATTRIB_FREQ,
audioStream.DefaultSampleRate);
Thread.Sleep(1);
}
SetVolume(audioStream, 100M);
}
