public Encoder(EventHandler<NewFrameEventArgs> NewFrame, EventHandler<AudioSourceErrorEventArgs> AudioSourceError)
{
AudioDeviceCollection audioDevices = new AudioDeviceCollection(AudioDeviceCategory.Capture);
AudioDeviceInfo INfo = null;
foreach (var item in audioDevices)
{
INfo = item;
}
// Create capture device
this.source = new AudioCaptureDevice(INfo.Guid)
{
// Listen on 22050 Hz
DesiredFrameSize = FRAME_SIZE,
SampleRate = SAMPLE_RATE,
// We will be reading 16-bit PCM
Format = SampleFormat.Format16Bit
};
// Wire up some events
source.NewFrame += NewFrame;
source.AudioSourceError += AudioSourceError;
// Create buffer for wavechart control
this.current = new float[source.DesiredFrameSize];
// Create stream to store file
this.stream = new MemoryStream();
this.encoder = new WaveEncoder(stream);
}
public void WaveEncoderConstructorTest()
{
// Load a file in PCM 16bpp format
// Number of samples: 352.800
// Number of frames: 176.400
// Sample rate: 44.100 Hz
// Block align: 4
// Channels: 2
// Duration: 4.0 s
// Bytes: 705.644
// sizeof(float) = 4
// sizeof(int) = 4
// sizeof(short) = 2
UnmanagedMemoryStream sourceStream = Properties.Resources.Grand_Piano___Fazioli___major_A_middle;
MemoryStream destinationStream = new MemoryStream();
// Create a decoder for the source stream
WaveDecoder sourceDecoder = new WaveDecoder(sourceStream);
Assert.AreEqual(2, sourceDecoder.Channels);
Assert.AreEqual(352800, sourceDecoder.Samples);
Assert.AreEqual(176400, sourceDecoder.Frames);
Assert.AreEqual(4000, sourceDecoder.Duration);
Assert.AreEqual(44100, sourceDecoder.SampleRate);
Assert.AreEqual(16, sourceDecoder.BitsPerSample);
Assert.AreEqual(22050, sourceDecoder.AverageBitsPerSecond);
// Decode the signal in the source stream
Signal sourceSignal = sourceDecoder.Decode();
Assert.AreEqual(352800, sourceSignal.Samples);
Assert.AreEqual(176400, sourceSignal.Length);
Assert.AreEqual(4000, sourceSignal.Duration);
Assert.AreEqual(2, sourceSignal.Channels);
Assert.AreEqual(44100, sourceSignal.SampleRate);
Assert.AreEqual(sizeof(float) * 352800, sourceSignal.RawData.Length);
Assert.AreEqual(sizeof(short) * 352800, sourceDecoder.Bytes);
// Create a encoder for the destination stream
WaveEncoder encoder = new WaveEncoder(destinationStream);
// Encode the signal to the destination stream
encoder.Encode(sourceSignal);
Assert.AreEqual(2, encoder.Channels);
Assert.AreEqual(352800, encoder.Samples);
Assert.AreEqual(176400, encoder.Frames);
Assert.AreEqual(4000, encoder.Duration);
Assert.AreEqual(44100, encoder.SampleRate);
Assert.AreEqual(32, encoder.BitsPerSample);
Assert.AreEqual(sizeof(float) * 352800, encoder.Bytes);
// Rewind both streams, them attempt to read the destination
sourceStream.Seek(0, SeekOrigin.Begin);
destinationStream.Seek(0, SeekOrigin.Begin);
// Create a decoder to read the destination stream
WaveDecoder destDecoder = new WaveDecoder(destinationStream);
Assert.AreEqual(2, destDecoder.Channels);
Assert.AreEqual(176400, destDecoder.Frames);
Assert.AreEqual(352800, destDecoder.Samples);
Assert.AreEqual(4000, destDecoder.Duration);
Assert.AreEqual(44100, destDecoder.SampleRate);
Assert.AreEqual(32, destDecoder.BitsPerSample);
Assert.AreEqual(22050, sourceDecoder.AverageBitsPerSecond);
// Decode the destination stream
Signal destSignal = destDecoder.Decode();
// Assert that the signal which has been saved to the destination
// stream and the signal which has just been read from this same
// stream are identical
Assert.AreEqual(sourceSignal.Length, destSignal.Length);
Assert.AreEqual(sourceSignal.SampleFormat, destSignal.SampleFormat);
Assert.AreEqual(sourceSignal.SampleRate, destSignal.SampleRate);
Assert.AreEqual(sourceSignal.Samples, destSignal.Samples);
Assert.AreEqual(sourceSignal.Duration, destSignal.Duration);
for (int i = 0; i < sourceSignal.RawData.Length; i++)
{
byte actual = sourceSignal.RawData[i];
byte expected = destSignal.RawData[i];
Assert.AreEqual(expected, actual);
}
}
/// <summary>
/// Starts recording audio from the sound card
/// </summary>
///
private void btnRecord_Click(object sender, EventArgs e)
{
// Create capture device
source = new AudioCaptureDevice()
{
// Listen on 22050 Hz
DesiredFrameSize = 4096,
SampleRate = 22050,
// We will be reading 16-bit PCM
Format = SampleFormat.Format16Bit
};
// Wire up some events
source.NewFrame += source_NewFrame;
source.AudioSourceError += source_AudioSourceError;
// Create buffer for wavechart control
current = new float[source.DesiredFrameSize];
// Create stream to store file
stream = new MemoryStream();
encoder = new WaveEncoder(stream);
// Start
source.Start();
updateButtons();
}
private void adjustVolume(float value)
{
// First, we rewind the stream
stream.Seek(0, SeekOrigin.Begin);
// Then we create a decoder for it
decoder = new WaveDecoder(stream);
var signal = decoder.Decode();
// We apply the volume filter
var volume = new VolumeFilter(value);
volume.ApplyInPlace(signal);
// Then we store it again
stream.Seek(0, SeekOrigin.Begin);
encoder = new WaveEncoder(stream);
encoder.Encode(signal);
}
private void btnRecord_Click(object sender, EventArgs e)
{
// Create capture device
source = new AudioCaptureDevice();
source.DesiredFrameSize = 4096;
source.SampleRate = 22050;
source.NewFrame += source_NewFrame;
source.AudioSourceError += source_AudioSourceError;
// Create buffer for wavechart control
current = new float[source.DesiredFrameSize];
// Create stream to store file
stream = new MemoryStream();
encoder = new WaveEncoder(stream);
// Start
source.Start();
updateButtons();
}