private void button1_Click(object sender, EventArgs e)
{
// int[] x = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }; // RMS = 6.20483682299543
// int[] x = new int[] { 10, 9, 8, 9, 10, 9, 8, 9, 10, 9, 8, 9, 10 }; // RMS = 9.10621089823187
// int[] x = new int[] { 10, 9, 8, 10, 9, 8, 10, 9, 8, 10, 9, 8 }; // RMS = 9.03696114115064
Int16[] x = new Int16[] { 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9 }; // RMS = 9
TextboxRmsValue.Text = (AudioMath.RootMeanSquare(x)).ToString();
}
private void DecodePcmAudio()
{
int bytesReadFromBuffer;
int samplesReadFromBuffer;
int totalSamplesReadFromBuffer = 0;
int framesReadFromBuffer = 0;
int totalBytesToRead = bytesPerSample * samplesTotal;
int frameCount = samplesTotal / channelCount;
int frameSizeBytes = bytesPerSample * channelCount;
int frameWindowSize = 1024;
int frameWindowIndex = 0;
int framesRemaining;
int dataIndex = 0;
int numberOfSamplesToRead = frameWindowSize * channelCount;
int dbfsValue;
ISampleProvider decoder = new AudioFileReader(selectedFile);
Log.Debug("Beginning decode of PCM audio");
if (CheckboxShowDsp.Checked == true)
{
float rmsValue = 0f;
List <string> rmsList = new List <string>();
Stopwatch stopWatch = new Stopwatch();
stopWatch.Start();
float[] sampleBuffer = new float[frameWindowSize * channelCount];
while ((totalSamplesReadFromBuffer = decoder.Read(sampleBuffer, 0, sampleBuffer.Length)) > 0)
{
if (totalSamplesReadFromBuffer < sampleBuffer.Length) // We must be at the end of the file then
{
rmsValue = AudioMath.RootMeanSquare(sampleBuffer, totalSamplesReadFromBuffer);
}
else
{
rmsValue = AudioMath.RootMeanSquare(sampleBuffer);
}
dbfsValue = AudioMath.ConvertToDbfs(rmsValue);
#if DSP_USES_SIGNALS
CanPlayAudio.WaitOne();
ThreadPool.QueueUserWorkItem(PlaybackAudioFromBuffer, sampleBuffer);
#else
PlaybackAudioFromBuffer(sampleBuffer);
#endif
long elapsedTime = stopWatch.ElapsedMilliseconds;
string dbfsString = String.Format("FrameWindow: {0}, Time: {1}ms, dBFS: {2}", frameWindowIndex.ToString(), elapsedTime.ToString(), dbfsValue.ToString());
TextboxRmsValue.Text = dbfsString;
rmsList.Add(dbfsString);
if (CheckboxReverseList.Checked == true)
{
ListboxRmsList.Items.Insert(0, dbfsString);
}
else
{
ListboxRmsList.Items.Add(dbfsString);
}
frameWindowIndex++;
#if DSP_FORCES_FORM_UPDATE
this.Update();
#endif
}
stopWatch.Stop();
}
else
{
if (outputDevice == null)
{
var trimmed = new OffsetSampleProvider(decoder)
{
// DelayBy = TimeSpan.FromSeconds(1),
// LeadOut = TimeSpan.FromSeconds(1),
// SkipOverSamples = 4096 * 4
};
outputDevice = new WaveOutEvent();
outputDevice.DesiredLatency = 600;
outputDevice.PlaybackStopped += OnPlaybackStopped;
outputDevice.Init(trimmed);
outputDevice.Play();
}
}
Log.Debug("Finished decode of PCM audio");
}