public void Enqueue(Mp3FrameInfo frameInfo)
{
if(_buffer == null)
{
// initialize the frame information
_buffer = new Queue<Mp3FrameInfo>();
var frame = frameInfo.Frame;
var samplesPerMillisecond = (double)frame.SampleRate / (double)1000;
var numSamples = _duration * samplesPerMillisecond;
_durationInFrames = Math.Ceiling(numSamples / frame.SampleCount);
}
// if we're already full then drop the first frame that was added.
if (IsFull)
Dequeue();
_buffer.Enqueue(frameInfo);
}
public void Enqueue(Mp3FrameInfo frameInfo)
{
if (_buffer == null)
{
// initialize the frame information
_buffer = new Queue <Mp3FrameInfo>();
var frame = frameInfo.Frame;
var samplesPerMillisecond = (double)frame.SampleRate / (double)1000;
var numSamples = _duration * samplesPerMillisecond;
_durationInFrames = Math.Ceiling(numSamples / frame.SampleCount);
}
// if we're already full then drop the first frame that was added.
if (IsFull)
{
Dequeue();
}
_buffer.Enqueue(frameInfo);
}
public void AddFrameInfo(Mp3FrameInfo frameInfo)
{
if(_buffer == null)
{
_buffer = new Queue<Mp3FrameInfo>();
var frame = frameInfo.Frame;
var samplesPerMillisecond = (double)frame.SampleRate / (double)1000;
var numSamples = _duration * samplesPerMillisecond;
_durationInFrames = Math.Ceiling(numSamples / frame.SampleCount);
}
if(IsFull())
{
_buffer.Dequeue();
var v = _volumes.Dequeue();
_totalVolume -= v;
}
_buffer.Enqueue(frameInfo);
var frameVolume = frameInfo.AverageVolume;
_volumes.Enqueue(frameVolume);
_totalVolume += frameVolume;
_averageVolume = _totalVolume / _volumes.Count;
if(_greaterThan)
{
if (_averageVolume >= _volumeLevel && IsFull())
_isSet = true;
}
else
{
if (_averageVolume <= _volumeLevel && IsFull())
_isSet = true;
}
}
public void ProcessFrames(IEnumerable<Mp3Frame> frames)
{
var decompressedData = new byte[1024 * 16];
var bytesDecompressed = 0;
var samples = new float[1024 * 4];
var currentTrigger = _startTrigger;
var isRecording = false;
Stream outputFile = null;
string outputFileName = string.Empty;
string fullOutputFileName = string.Empty;
foreach (var frame in frames)
{
// find the average volume for the samples in this frame.
bytesDecompressed = DecompressFrame(frame, decompressedData);
// convert samples to wave
_waveProvider.AddSamples(decompressedData, 0, bytesDecompressed);
var samplesRead = _sampleProvider.Read(samples, 0, _waveProvider.BufferedBytes);
// find average of samples
var average = GetSamplesAverage(samples, samplesRead);
var frameInfo = new Mp3FrameInfo(frame, average);
currentTrigger.AddFrameInfo(frameInfo);
if(currentTrigger.IsSet())
{
// we need to switch state
if(isRecording)
{
// the end recording trigger was set
isRecording = false;
_buffer.Clear();
_startTrigger.Clear();
currentTrigger = _startTrigger;
outputFile.Flush();
outputFile.Close();
}
else
{
// the start recording trigger was set
isRecording = true;
_endTrigger.Clear();
currentTrigger = _endTrigger;
if(!_buffer.IsFull && !string.IsNullOrEmpty(outputFileName))
{
// since we had a previous file and the buffer isn't full yet we'll just append
// this recording to the previous one.
outputFile = File.OpenWrite(fullOutputFileName);
Console.WriteLine($"Appneding clip {outputFileName}");
// the trigger frames should be contained in the buffer along with any
// frames since the previous recording stopped.
foreach (var fi in _buffer.GetFrames())
{
var d = fi.Frame.RawData;
outputFile.Write(d, 0, d.Length);
}
}
else
{
var fileTime = DateTime.Now;
outputFileName = fileTime.ToString("yyyy.MM.dd.THH.mm.ss.ffffff") + ".mp3";
fullOutputFileName = Path.Combine(GetFilePath(fileTime), outputFileName);
outputFile = File.OpenWrite(fullOutputFileName);
Console.WriteLine($"Writing clip {outputFileName}");
// We want to put the frames from the trigger into the output
foreach (var fi in _startTrigger.GetFrames())
{
var d = fi.Frame.RawData;
outputFile.Write(d, 0, d.Length);
}
}
}
}
if(!isRecording)
{
_buffer.Enqueue(frameInfo);
}
else
{
// write the frame to the file.
var data = frameInfo.Frame.RawData;
outputFile.Write(data, 0, data.Length);
}
}
}
