/// <summary>
/// Get min amplitude ( for right choose silence threshold for method DetectSilenceLevel() )
/// </summary>
/// <returns>Min Amplitude</returns>
public float GetMinAmplitude()
{
// safe old position of cursor
long oldPosition = AudioReader.Position;
// buffer
float[] amplitudeArray = new float[AudioReader.WaveFormat.SampleRate];
// end of file
bool eof = false;
float min = 0;
while (!eof)
{
int ReadedSamples = AudioReader.Read(amplitudeArray, 0, amplitudeArray.Length);
if (ReadedSamples == 0)
{
eof = true;
}
for (int i = 0; i < ReadedSamples; i++)
{
min = Math.Min(amplitudeArray[i], min);
}
}
AudioReader.Position = oldPosition;
return(min);
}
/// ------------------------------------------------------------------------------------
/// <summary>
///
/// </summary>
/// ------------------------------------------------------------------------------------
private bool Initialize(string audioFilePath)
{
m_doc = SaAudioDocument.Load(audioFilePath, false, true);
if (m_doc != null)
{
ResetSegmentEnumerators();
return(true);
}
try
{
using (AudioReader audioReader = new AudioReader())
{
AudioReader.InitResult result = audioReader.Initialize(audioFilePath);
if (result == AudioReader.InitResult.FileNotFound)
{
return(false);
}
if ((result == AudioReader.InitResult.InvalidFormat))
{
return(false);
}
// Try reading data from older SA audio files, converting
// it to Unicode along the way.
if (!audioReader.Read(true))
{
return(false);
}
// Now try reading the companion transcription file again.
m_doc = SaAudioDocument.Load(audioFilePath, false, false);
ResetSegmentEnumerators();
}
}
catch
{
return(false);
}
return(true);
}
void ProcessImpulse(object sender, RoutedEventArgs e)
{
if (browser.ShowDialog().Value)
{
AudioReader reader = AudioReader.Open(browser.FileName);
float[] impulse = reader.Read();
float gain = 1;
if (keepGain.IsChecked.Value)
{
gain = WaveformUtils.GetPeak(impulse);
}
if (commonEQ.IsChecked.Value)
{
ProcessCommon(reader, ref impulse);
}
else
{
ProcessPerChannel(reader, ref impulse);
}
if (keepGain.IsChecked.Value)
{
WaveformUtils.Gain(impulse, gain / WaveformUtils.GetPeak(impulse));
}
BitDepth bits = reader.Bits;
if (forceFloat.IsChecked.Value)
{
bits = BitDepth.Float32;
}
int targetLen = QMath.Base2Ceil((int)reader.Length);
if (separateExport.IsChecked.Value)
{
ReferenceChannel[] channels = ChannelPrototype.GetStandardMatrix(reader.ChannelCount);
for (int ch = 0; ch < reader.ChannelCount; ++ch)
{
string exportName = Path.GetFileName(browser.FileName);
int idx = exportName.LastIndexOf('.');
string channelName = ChannelPrototype.Mapping[(int)channels[ch]].Name;
exporter.FileName = $"{exportName[..idx]} - {channelName}{exportName[idx..]}";
private void LoadFiles(object sender, RoutedEventArgs e)
{
AudioReader responseReader = Import("Response.wav");
if (responseReader == null)
{
return;
}
AudioReader impulseReader = Import("Impulse.wav");
if (impulseReader == null)
{
return;
}
float[] response = responseReader.Read(),
impulse = impulseReader.Read();
if (responseReader.SampleRate != impulseReader.SampleRate)
{
Error("The sample rate of the two clips don't match.");
return;
}
int responseChannels = responseReader.ChannelCount,
impulseChannels = impulseReader.ChannelCount;
if (impulseChannels != 1 && impulseChannels != responseChannels)
{
Error("The channel count of the two clips don't match. A single-channel impulse is also acceptable.");
return;
}
int fftSize = Math.Max(
QMath.Base2Ceil((int)responseReader.Length),
QMath.Base2Ceil((int)impulseReader.Length)
);
if (padding.IsChecked.Value)
{
Array.Resize(ref response, fftSize + response.Length);
Array.Copy(response, 0, response, fftSize, response.Length - fftSize);
Array.Clear(response, 0, fftSize);
fftSize = Math.Max(fftSize, QMath.Base2Ceil(response.Length));
}
Complex[] impulseFFT = new Complex[fftSize],
responseFFT = new Complex[fftSize];
FFTCache cache = new FFTCache(fftSize);
float[] responseChannel = new float[response.Length / responseChannels];
for (int channel = 0; channel < responseChannels; ++channel)
{
if (channel < impulseChannels) // After the channel count check this runs once or for each channel
{
float[] impulseChannel = impulse;
if (impulseChannels != 1)
{
impulseChannel = new float[impulseReader.Length];
WaveformUtils.ExtractChannel(impulse, impulseChannel, channel, impulseChannels);
Array.Clear(impulseFFT, 0, fftSize);
}
for (int sample = 0; sample < impulseChannel.Length; ++sample)
{
impulseFFT[sample].Real = impulseChannel[sample];
}
Measurements.InPlaceFFT(impulseFFT, cache);
}
if (responseChannels == 1)
{
responseChannel = response;
}
else
{
WaveformUtils.ExtractChannel(response, responseChannel, channel, responseChannels);
}
if (channel != 1)
{
Array.Clear(responseFFT, 0, fftSize);
}
for (int sample = 0; sample < responseChannel.Length; ++sample)
{
responseFFT[sample].Real = responseChannel[sample];
}
Measurements.InPlaceFFT(responseFFT, cache);
for (int sample = 0; sample < fftSize; ++sample)
{
responseFFT[sample].Divide(impulseFFT[sample]);
}
Measurements.InPlaceIFFT(responseFFT, cache);
for (int i = 0, channels = responseChannels; i < responseChannel.Length; ++i)
{
response[channels * i + channel] = responseFFT[i].Real;
}
}
exporter.FileName = "Deconvolved.wav";
if (exporter.ShowDialog().Value)
{
BinaryWriter handler = new BinaryWriter(File.OpenWrite(exporter.FileName));
using RIFFWaveWriter writer = new RIFFWaveWriter(handler, responseChannels, responseReader.Length,
responseReader.SampleRate, responseReader.Bits);
writer.Write(response);
}
}
/// <summary>
/// detect volume level in audio file
/// </summary>
/// <param name="amplitudeSilenceThreshold">amplitude Threshold ( between 1 and 0 )</param>
/// <param name="Millisec">we split all audio on millisec blocks and detect this block as silence or sound</param>
/// <returns>
/// List of Time duration and Volume level ( Sound or Silence )
/// </returns>
private List <TimeSpanVolume> DetectVolumeLevel(
float amplitudeSilenceThreshold,
int Millisec)
{
if (amplitudeSilenceThreshold > 1 || amplitudeSilenceThreshold < 0)
{
throw new ArgumentOutOfRangeException($"amplitudeSilenceThreshold ({amplitudeSilenceThreshold}) can't be more than 1 or less than 0");
}
List <TimeSpanVolume> TimeSpanVolumes = new List <TimeSpanVolume>();
// safe old position of cursor
long oldPosition = AudioReader.Position;
// define blockSamples by millisec
TimeSpan timeSpan = TimeSpan.FromMilliseconds(Millisec);
// number of Samples we ananlyze for 1 time
int blockSamples = MillisecToSamplesBlock(Millisec);
// buffer
BufferSize = MillisecToSamplesBlock(Millisec);
float[] amplitudeArray = new float[BufferSize];
// end of file
bool eof = false;
while (!eof)
{
int ReadedSamples = AudioReader.Read(amplitudeArray, 0, amplitudeArray.Length);
if (ReadedSamples == 0)
{
eof = true;
}
// Samples that is not divided on blockSamples
int RemainSamples = ReadedSamples % blockSamples;
ReadedSamples -= RemainSamples;
// MAIN ANALYZE
for (int i = 0; i < ReadedSamples; i += blockSamples)
{
float average = 0;
// one block can be not completed ( size of block not equals blockSamples )
int analyzedSamples = 0;
// i + j < amplitudeArray.Length - out of the range
for (int j = 0; j < blockSamples && i + j < amplitudeArray.Length; j++)
{
// amplitude can be negative
float sampleLocal = Math.Abs(amplitudeArray[i + j]);
average += sampleLocal;
analyzedSamples++;
}
average /= analyzedSamples;
// DETECT Is Silence
bool isSilenceRemain = average < amplitudeSilenceThreshold ? true : false;
VolumeValue volumeRemain = isSilenceRemain ?
VolumeValue.Silence :
VolumeValue.Noise;
// add timespan to list
TimeSpanVolume spanRemain = new TimeSpanVolume(volumeRemain, timeSpan);
TimeSpanVolumes.Add(spanRemain);
}
// Remain ANALYZE
// if Remain samples is not 0, that means we need to analyze it separately (last samples is not clear for dividing it on blocks)
float averageRemain = 0;
for (int i = ReadedSamples; i < ReadedSamples + RemainSamples; i++)
{
float sampleLocal = Math.Abs(amplitudeArray[i]);
averageRemain += sampleLocal;
}
averageRemain /= RemainSamples;
// check if Time span is not empty
TimeSpan remainTimeSpan = TimeSpan.FromMilliseconds(SamplesBlockToMillisec(RemainSamples));
if (remainTimeSpan > TimeSpan.Zero)
{
// DETECT Is Silence
bool isSilence = averageRemain < amplitudeSilenceThreshold ? true : false;
VolumeValue volume = isSilence ?
VolumeValue.Silence :
VolumeValue.Noise;
// add timespan to list
TimeSpanVolume span = new TimeSpanVolume(volume, remainTimeSpan);
TimeSpanVolumes.Add(span);
}
}
AudioReader.Position = oldPosition;
TimeSpanVolumes.TrimExcess();
//TimeSpanVolumes = SqueezeListOfTimeSpans(TimeSpanVolumes);
return(TimeSpanVolumes);
}
