| public Read ( byte sampleBuffer, int offset, int numBytes ) : int | ||
| sampleBuffer | byte | |
| offset | int | |
| numBytes | int | |
| return | int | |
public double[][] GetNextChunk(int samplesDesired, Mp3FileReader fr, bool fullnormalize = false)
{
byte[] buffer = new byte[samplesDesired * 4];
short[] left = new short[samplesDesired];
//short[] right = new short[samplesDesired];
double[] leftd = new double[samplesDesired];
//double[] rightd = new double[samplesDesired];
int bytesRead = 0;
try
{
bytesRead = fr.Read(buffer, 0, 4 * samplesDesired);
}
catch
{
new Exception("An error occurred while reading file");
}
int index = 0;
for (int sample = 0; sample < bytesRead / 4; sample++)
{
left[sample] = BitConverter.ToInt16(buffer, index); index += 2;
//right[sample] = BitConverter.ToInt16(buffer, index);
index += 2;
}
if (fullnormalize)
leftd = Utilities.NormalizeFull(ref left, left.Length);
else
leftd = Utilities.Normalize(ref left, left.Length);
return new double[][] { leftd, null }; //rightd };
}
public void CanLoadAndReadVariousProblemMp3Files()
{
string testDataFolder = @"C:\Users\Mark\Downloads\NAudio";
if (!Directory.Exists(testDataFolder))
{
Assert.Ignore("{0} not found", testDataFolder);
}
foreach (string file in Directory.GetFiles(testDataFolder, "*.mp3"))
{
string mp3File = Path.Combine(testDataFolder, file);
Debug.WriteLine(String.Format("Opening {0}", mp3File));
using (var reader = new Mp3FileReader(mp3File))
{
byte[] buffer = new byte[4096];
int bytesRead;
int total = 0;
do
{
bytesRead = reader.Read(buffer, 0, buffer.Length);
total += bytesRead;
} while (bytesRead > 0);
Debug.WriteLine(String.Format("Read {0} bytes", total));
}
}
}
public mp3Processor(string file)
{
buf = new byte[maxLen];
WaveStream mp3Reader = new Mp3FileReader(file);
int read = mp3Reader.Read(buf, 0, buf.Length);
len = read;
}
public static byte[] getByteArray(string file, ref int len, ref int channels)
{
byte[] buf = new byte[maxLen];
WaveStream mp3Reader = new Mp3FileReader(file);
channels = mp3Reader.WaveFormat.Channels;
int read = mp3Reader.Read(buf, 0, buf.Length);
len = read;
return buf;
}
public bool MakeSnaps(int _snapsize, int _snapcount, string _path, int smooth_size)
{
try
{
using (Mp3FileReader pcm = new Mp3FileReader(_path))
{
int samplesDesired = _snapsize;
int blockscount = _snapcount;
snap_size = _snapsize;
snap_count = _snapcount;
total_samples = pcm.Length;
length = pcm.TotalTime.Seconds;
path = _path;
if ((pcm.WaveFormat.SampleRate != 44100) || (pcm.WaveFormat.BitsPerSample != 16))
return false;
for (int i = 0; i < blockscount; i++)
{
byte[] buffer = new byte[samplesDesired * 4];
short[] left = new short[samplesDesired];
short[] right = new short[samplesDesired];
double[] leftd = new double[samplesDesired];
double[] rightd = new double[samplesDesired];
int bytesRead = 0;
//for (int j = 0; j < 1; j++) ///////////
int seek_counter = 0;
seek: pcm.Seek((i + 1) * (i + 1) * (i + 1) * blockscount * samplesDesired % (total_samples - samplesDesired), SeekOrigin.Begin);
seek_counter++;
bytesRead = pcm.Read(buffer, 0, 4 * samplesDesired);
int index = 0;
for (int sample = 0; sample < bytesRead / 4; sample++)
{
left[sample] = BitConverter.ToInt16(buffer, index); index += 2;
right[sample] = BitConverter.ToInt16(buffer, index); index += 2;
}
if (left.Average(t => Math.Abs(t)) == 0)
if (seek_counter > 5)
return false;
else
goto seek;
//snap_log10_energy.Add(Math.Log10(left.Average(t => Math.Abs(t))));
leftd = Normalize(left, left.Length);
rightd = Normalize(right, right.Length);
//alglib.complex[] fl;
//alglib.fftr1d(leftd, out fl);
//fl[0].x;
FourierTransformer ft = new FourierTransformer(samplesDesired);
var xxa = new Complex[leftd.Length];
for (int j = 0; j < leftd.Length; j++)
xxa[j] = new Complex(leftd[j], rightd[j]);
var ftt = ft.Transform(xxa);
List<double> pow_re_im = new List<double>();
//List<double> arg_re_im = new List<double>();
ftt.ToList().ForEach(t => pow_re_im.Add(ComplexMath.Abs(t)));
//ftt.ToList().ForEach(t => arg_re_im.Add(ComplexMath.Arg(t)));
/*if (Double.IsNaN(MC_Log10_Energy(pow_re_im)))
if (seek_counter > 5)
return false;
else
goto seek;*/
fft_snaps.Add(pow_re_im);
//fft_smoothed_snaps.Add(Smoothen(pow_re_im, smooth_size));
//pow_re_im = Normalize(pow_re_im);
/*
var f_pwri = pow_re_im.Average(t => Math.Abs(t));
for (int k = 0; k < pow_re_im.Count; k++)
pow_re_im[k] = (Math.Abs(pow_re_im[k]) >= f_pwri * 1.5) ? pow_re_im[k] : 0;
*/
/*
FourierTransformer ft2 = new FourierTransformer(samplesDesired);
var xx2 = new List<Complex>();
for (int j = 0; j < pow_re_im.Count; j++)
{
xx2.Add(new Complex(pow_re_im[j], arg_re_im[j]));
}
var ftt2 = ft2.Transform(xx2);
//var ftt2 = ft2.Transform(ftt);
List<double> pow_re_im2 = new List<double>();
ftt2.ToList().ForEach(t => pow_re_im2.Add(ComplexMath.Abs(t)));
pow_re_im2 = Normalize(pow_re_im2);
fft2_snaps.Add(pow_re_im2);
fft2_smoothed_snaps.Add(Smoothen(pow_re_im2, smooth_size));
*/
}
pcm.Close();
}
}
catch (Exception e)
{
return false;
}
return true;
}
private static byte[] PlayAudioFile(string substring)
{
//return File.ReadAllBytes(substring);
Console.WriteLine("Playing...");
Stream inputStream = new MemoryStream(File.ReadAllBytes(substring));
inputStream.Seek(0, SeekOrigin.Begin);
Stream outputStream = new MemoryStream();
byte[] bytes = new byte[inputStream.Length];
string path = @"C:\temp";
string wavFile = @"C:\temp\tempWav.wav";
if (!Directory.Exists(path))
Directory.CreateDirectory(path);
if (File.Exists(wavFile))
File.Delete(wavFile);
using (var reader = new Mp3FileReader(substring))
{
using (var writer = new WaveFileWriter(wavFile, new WaveFormat()))
{
var buf = new byte[4096];
for (; ; )
{
var cnt = reader.Read(buf, 0, buf.Length);
if (cnt == 0) break;
writer.Write(buf, 0, cnt);
}
}
}
//SoundPlayer p = new SoundPlayer(wavFile);
//p.Play();
return File.ReadAllBytes(wavFile);
}
/// <summary>
/// Convert a MP3 file to a Wav file
/// </summary>
/// <param name="mp3FilePath"></param>
/// <param name="wavFilePath"></param>
public static void ConvertMp3ToWav(string mp3FilePath, string wavFilePath)
{
using (var reader = new Mp3FileReader(mp3FilePath)) {
using (var writer = new WaveFileWriter(wavFilePath, new WaveFormat())) {
byte[] buffer = new byte[16*1024];
for (;;) {
int bytes = reader.Read(buffer, 0, buffer.Length);
if (bytes == 0) break;
writer.Write(buffer, 0, bytes);
}
}
}
}
private void WriteToFile(string SongID, string strPath, byte[] Buffer)
{
try
{
int samplesPerPixel = 128;
long startPosition = 0;
//FileStream newFile = new FileStream(GeneralUtils.Get_SongFilePath() + "/" + strPath, FileMode.Create);
float[] data = FloatArrayFromByteArray(Buffer);
Bitmap bmp = new Bitmap(1170, 200);
int BORDER_WIDTH = 5;
int width = bmp.Width - (2 * BORDER_WIDTH);
int height = bmp.Height - (2 * BORDER_WIDTH);
NAudio.Wave.Mp3FileReader reader = new NAudio.Wave.Mp3FileReader(strPath, wf => new NAudio.FileFormats.Mp3.DmoMp3FrameDecompressor(wf));
NAudio.Wave.WaveChannel32 channelStream = new NAudio.Wave.WaveChannel32(reader);
int bytesPerSample = (reader.WaveFormat.BitsPerSample / 8) * channelStream.WaveFormat.Channels;
using (Graphics g = Graphics.FromImage(bmp))
{
g.Clear(Color.White);
Pen pen1 = new Pen(Color.Gray);
int size = data.Length;
string hexValue1 = "#009adf";
Color colour1 = System.Drawing.ColorTranslator.FromHtml(hexValue1);
pen1.Color = colour1;
Stream wavestream = new NAudio.Wave.Mp3FileReader(strPath, wf => new NAudio.FileFormats.Mp3.DmoMp3FrameDecompressor(wf));
wavestream.Position = 0;
int bytesRead1;
byte[] waveData1 = new byte[samplesPerPixel * bytesPerSample];
wavestream.Position = startPosition + (width * bytesPerSample * samplesPerPixel);
for (float x = 0; x < width; x++)
{
short low = 0;
short high = 0;
bytesRead1 = wavestream.Read(waveData1, 0, samplesPerPixel * bytesPerSample);
if (bytesRead1 == 0)
{
break;
}
for (int n = 0; n < bytesRead1; n += 2)
{
short sample = BitConverter.ToInt16(waveData1, n);
if (sample < low)
{
low = sample;
}
if (sample > high)
{
high = sample;
}
}
float lowPercent = ((((float)low) - short.MinValue) / ushort.MaxValue);
float highPercent = ((((float)high) - short.MinValue) / ushort.MaxValue);
float lowValue = height * lowPercent;
float highValue = height * highPercent;
g.DrawLine(pen1, x, lowValue, x, highValue);
}
}
string filename = Server.MapPath("image/060.png");
bmp.Save(filename);
bmp.Dispose();
}
catch (Exception e)
{
}
}
