/// <summary>
/// Read the header from a wave file, and move the
/// reader's position to the beginning of the data chunk
/// </summary>
/// <param name="reader">Reader for the wave file.</param>
/// <returns>Format of the wave.</returns>
private WaveFormat1 ReadHeader(BinaryReader reader)
{
if (ReadChunk(reader) != "RIFF")
throw new Exception("Invalid file format");
reader.ReadInt32(); // File length minus first 8 bytes of RIFF description, we don't use it
if (ReadChunk(reader) != "WAVE")
throw new Exception("Invalid file format");
if (ReadChunk(reader) != "fmt ")
throw new Exception("Invalid file format");
int len = reader.ReadInt32();
if (len < 16) // bad format chunk length
throw new Exception("Invalid file format");
WaveFormat1 carrierFormat = new WaveFormat1();
carrierFormat.FormatTag = reader.ReadInt16();
carrierFormat.Channels = reader.ReadInt16();
carrierFormat.SamplesPerSec = reader.ReadInt32();
carrierFormat.AvgBytesPerSec = reader.ReadInt32();
carrierFormat.BlockAlign = reader.ReadInt16();
carrierFormat.BitsPerSample = reader.ReadInt16();
// advance in the stream to skip the wave format block
len -= 16; // minimum format size
while (len > 0)
{
reader.ReadByte();
len--;
}
// assume the data chunk is aligned
string chunk;
do
{
chunk = ReadChunk(reader);
} while (reader.BaseStream.Position < reader.BaseStream.Length && chunk != "data");
return carrierFormat;
}
/// <summary>Constructor.</summary>
/// <param name="format">Format header information.</param>
/// <param name="samples">Wave samples.</param>
public WaveSound(WaveFormat1 format, short[] samples)
{
this.format = format;
this.samples = samples;
}
public static extern int waveOutOpen(out IntPtr hWaveOut, int uDeviceID, WaveFormat1 lpFormat, WaveDelegate dwCallback, int dwInstance, int dwFlags);
/// <summary>Reads a wave file.</summary>
/// <param name="fileName">Name and path of the file.</param>
/// <returns>Format and samples.</returns>
private void ReadFile(string fileName)
{
BinaryReader reader = new BinaryReader(new FileStream(fileName, FileMode.Open));
this.format = ReadHeader(reader);
if (format.BitsPerSample != 8 && format.BitsPerSample != 16)
{
System.Windows.Forms.MessageBox.Show("The sound has " + format.BitsPerSample + " bits per sample. Please choose a sound with 8 or 16 bits per sanmple.");
return;
}
int dataLength = reader.ReadInt32();
int maxSampleValue = 0;
int bytesPerSample = format.BitsPerSample / 8;
int countSamples = dataLength / bytesPerSample;
sbyte[] channelSamples8 = new sbyte[countSamples];
short[] channelSamples16 = new short[countSamples];
sbyte channelSample8;
int channelSamplesIndex = 0;
int absValue;
for (int sampleIndex = 0; sampleIndex < countSamples; sampleIndex++)
{
if (format.BitsPerSample == 8)
{
channelSample8 = reader.ReadSByte();
channelSamples16[channelSamplesIndex] = (short)(channelSample8 + (channelSample8 << 8));
if (Math.Abs((int)channelSample8) > maxSampleValue)
{
maxSampleValue = Math.Abs((int)channelSample8);
}
}
else
{
channelSamples16[channelSamplesIndex] = reader.ReadInt16();
absValue = Math.Abs((int)channelSamples16[channelSamplesIndex]);
if (absValue > maxSampleValue)
{
maxSampleValue = (absValue > short.MaxValue) ? absValue - 1 : absValue;
}
}
channelSamplesIndex++;
}
reader.Close();
format.BitsPerSample = 16;
//if (format.BitsPerSample == 8)
//{
// for (int n = 0; n < channelSamples8.Length; n++)
// {
// channelSamples16[n] = (short)channelSamples8[n];
// }
//}
var rrr = channelSamples8;
this.samples = channelSamples16;
}
//public short[] ReadFileRaw(string fileName, out float freq)
//public short[] ReadFileRaw(out float freq, out int chan)
//public short[] ReadFileRaw()
public short[] ReadFileWav()
{
reader = new BinaryReader(new FileStream(filename, FileMode.Open));
format = ReadHeader(reader);
WaveFormat1 d = format;
short[] ddss;
int dataLength = reader.ReadInt32();
int maxSampleValue = 0;
int bytesPerSample = format.BitsPerSample / 8;
int countSamples = dataLength / bytesPerSample;
//freq = format.SamplesPerSec;
{ }
//sbyte[] channelSamples8 = new sbyte[countSamples];
short[] channelSamples16 = new short[countSamples];
sbyte channelSample8;
int channelSamplesIndex = 0;
int absValue;
if (format.BitsPerSample == 8)
// 8 bit
{
reader.Close();
byte[] bt;
FileStream fs = new FileStream(filename, FileMode.Open, FileAccess.Read);
// Raw file don't have any "Header"
BinaryReader br = new BinaryReader(fs);
bt = br.ReadBytes((int)br.BaseStream.Length);
br.Close();
//ddss = new short[bt.Length - 44 - 76];
ddss = new short[bt.Length - 44 - 158];
int k = 0;
for (int i = 44; i < bt.Length - 158; i++)
ddss[k++] = Convert.ToInt16(bt[i]);
}
// 16 bit
else
{
ddss = new short[countSamples];
for (int sampleIndex = 0; sampleIndex < countSamples; sampleIndex++)
{
channelSamples16[channelSamplesIndex] = reader.ReadInt16();
absValue = Math.Abs((int)channelSamples16[channelSamplesIndex]);
if (absValue > maxSampleValue)
{
maxSampleValue = (absValue > short.MaxValue) ? absValue - 1 : absValue;
}
channelSamplesIndex++;
}
ddss = channelSamples16;
reader.Close();
}
//chan = format.Channels;
//return channelSamples16;
return ddss;
}