public WaveReader(string file_name)
{
int i;
BinaryReader fw;
WaveHeader wav;
ChunkHeader chk;
int sflag;
int rmore;
char[] wbuff;
int wbuff_len;
// set defaults
g_wdata_in = null;
g_num_isamp = 0;
g_max_isamp = 0;
// allocate wav header
wav = new WaveHeader();
chk = new ChunkHeader();
// # open wav file
fw = new BinaryReader(File.OpenRead(file_name));
// # read riff/wav header
wav.ReadFromStream(fw);
// # check format of header
//if (strcmp(obuff, "RIFF") != 0) exit_msg(-587, "bad RIFF format");
if (!wav.rID.Equals("RIFF"))
{
throw new Exception("bad RIFF format");
}
//if (strcmp(obuff, "WAVE") != 0) exit_msg(-587, "bad WAVE format");
if (!wav.wID.Equals("WAVE"))
{
throw new Exception("bad WAVE format");
}
//if (strcmp(obuff, "fmt") != 0) exit_msg(-587, "bad fmt format");
if (!wav.fId.Equals("fmt "))
{
throw new Exception("bad fmt format");
}
//if (wav->wFormatTag != 1) exit_msg(-587, "bad wav wFormatTag");
if (wav.wFormatTag != 1)
{
throw new Exception("bad wav wFormatTag");
}
//if ((wav->nBitsPerSample != 16) && (wav->nBitsPerSample != 8)) exit_msg(-587, "bad wav stuff");
if (wav.nBitsPerSample != 16 && wav.nBitsPerSample != 8)
{
throw new Exception("bad wav nBitsPerSample");
}
// skip over any remaining portion of wav header
rmore = wav.pcm_header_len - (Marshal.SizeOf(typeof(WaveHeader)) - 20);
fw.ReadBytes(rmore);
// read chunks until a 'data' chunk is found
sflag = 1;
while (sflag != 0)
{
// check attempts
if (sflag > 10)
{
throw new Exception("too many chunks");
}
// read chunk header
chk.ReadFromStream(fw);
// check chunk type
if (chk.dId.Equals("data"))
{
break;
}
// skip over chunk
fw.ReadBytes(chk.dLen);
// increment the size flag
sflag++;
}
/* find length of remaining data */
wbuff_len = chk.dLen;
// find number of samples
g_max_isamp = chk.dLen;
g_max_isamp /= wav.nBitsPerSample / 8;
/* allocate new buffers */
wbuff = new char[wbuff_len];
// if(g_wdata_in!=NULL) delete g_wdata_in;
g_wdata_in = new double[g_max_isamp];
/* read signal data */
wbuff = fw.ReadChars(wbuff_len);
// convert data
if (wav.nBitsPerSample == 16)
{
for (i = 0; i < g_max_isamp; i++)
{
g_wdata_in[i] = (double)((ushort)(wbuff[i]));
}
}
else
{
for (i = 0; i < g_max_isamp; i++)
{
g_wdata_in[i] = (double)((byte)(wbuff[i]));
}
}
// save demographics
fs_hz = (double)(wav.nSamplesPerSec);
bits_per_sample = wav.nBitsPerSample;
num_ch = wav.nChannels;
// reset buffer stream index
g_num_isamp = 0;
// be polite - clean up
fw.Close();
}
// routine for saving a wave file.
// returns 0 on success, negative value on error
public int Save(string filename)
{
int i;
double ttt;
if (_waveData.Count <= 0)
{
throw new Exception("warning, no new data written to output");
}
// allocate wav header
WaveHeader wav = new WaveHeader();
ChunkHeader chk = new ChunkHeader();
/* allocate new data buffers */
int wbuff_len = _waveData.Count * _bitsPerSample / 8;
List <byte> wbuff = new List <byte>(wbuff_len);
// setup wav header
wav.rID = "RIFF";
wav.wID = "WAVE";
wav.fId = "fmt ";
wav.nBitsPerSample = (short)_bitsPerSample;
wav.nSamplesPerSec = (int)_sampleRate;
wav.nAvgBytesPerSec = (int)_sampleRate;
wav.nAvgBytesPerSec *= _bitsPerSample / 8;
wav.nAvgBytesPerSec *= _numChannels;
wav.nChannels = (short)_numChannels;
wav.pcm_header_len = 16;
wav.wFormatTag = 1;
wav.rLen = Marshal.SizeOf(typeof(WaveHeader)) + Marshal.SizeOf(typeof(ChunkHeader)) + wbuff_len;
wav.nBlockAlign = (short)(_numChannels * _bitsPerSample / 8);
// setup chunk header
chk.dId = "data";
chk.dLen = wbuff_len;
// convert data
if (_bitsPerSample == 16)
{
for (i = 0; i < _waveData.Count; i++)
{
ttt = Wolfram.Clamp(_waveData[i], MinUuu, MaxUuu);
wbuff.AddRange(BitConverter.GetBytes((short)ttt));
}
}
else if (_bitsPerSample == 8)
{
for (i = 0; i < _waveData.Count; i++)
{
ttt = Wolfram.Clamp(_waveData[i], MinCcc, MaxCcc);
wbuff.AddRange(BitConverter.GetBytes((byte)ttt));
}
}
else
{
throw new Exception("bunk bits per sample");
}
/* open wav file */
BinaryWriter fw = new BinaryWriter(File.Open(filename, FileMode.Create, FileAccess.Write));
/* write riff/wav header */
wav.WriteToStream(fw);
/* write chunk header */
chk.WriteToStream(fw);
/* convert to byte array */
byte[] data = wbuff.ToArray();
/* write data */
fw.Write(data, 0, data.Length);
// reset output stream index
_waveData.Clear();
// be polite
fw.Close();
return(0);
}
