/// <summary>
/// Ensure any given wave file path that the file matches with default or base format [16bit 8kHz Mono]
/// </summary>
/// <param name="strPath">Wave file path</param>
/// <returns>True/False</returns>
public bool Validate(string strPath)
{
if (strPath == null)
{
strPath = "";
}
if (strPath == "")
{
return(false);
}
clsWaveProcessor wa_val = new clsWaveProcessor();
wa_val.WaveHeaderIN(strPath);
if (wa_val.BitsPerSample != BIT_PER_SMPL)
{
return(false);
}
if (wa_val.Channels != CHNL)
{
return(false);
}
if (wa_val.SampleRate != SMPL_RATE)
{
return(false);
}
return(true);
}
/// <summary>
/// Compare two wave files to ensure both are in same format
/// </summary>
/// <param name="Wave1">ref. to processor object</param>
/// <param name="Wave2">ref. to processor object</param>
/// <returns>True/False</returns>
private bool Compare(ref clsWaveProcessor Wave1, ref clsWaveProcessor Wave2)
{
if (Wave1.Channels != Wave2.Channels)
{
return(false);
}
if (Wave1.BitsPerSample != Wave2.BitsPerSample)
{
return(false);
}
if (Wave1.SampleRate != Wave2.SampleRate)
{
return(false);
}
return(true);
}
/// <summary>
/// Adapted from - Concatenation Wave Files using C# 2005 by By Ehab Mohamed Essa
/// URL - http://www.codeproject.com/useritems/Concatenation_Wave_Files.asp
/// </summary>
/// <param name="StartFile">Wave file to stay in the begining</param>
/// <param name="EndFile">Wave file to stay at the end</param>
/// <param name="OutFile">Merged output to wave file</param>
/// <returns>True/False</returns>
public bool Merge(string strStartFile, string strEndFile, string strOutFile)
{
if ((strStartFile == strEndFile) && (strStartFile == null))
{
return(false);
}
if ((strStartFile == strEndFile) && (strStartFile == ""))
{
return(false);
}
if ((strStartFile == strOutFile) || (strEndFile == strOutFile))
{
return(false);
}
clsWaveProcessor wa_IN_Start = new clsWaveProcessor();
clsWaveProcessor wa_IN_End = new clsWaveProcessor();
clsWaveProcessor wa_out = new clsWaveProcessor();
wa_out.DataLength = 0;
wa_out.Length = 0;
try
{
//Gather header data
if (!wa_IN_Start.WaveHeaderIN(@strStartFile))
{
return(false);
}
if (!wa_IN_End.WaveHeaderIN(@strEndFile))
{
return(false);
}
if (!Compare(ref wa_IN_Start, ref wa_IN_End))
{
return(false);
}
wa_out.DataLength = wa_IN_Start.DataLength + wa_IN_End.DataLength;
wa_out.Length = wa_IN_Start.Length + wa_IN_End.Length;
//Recontruct new header
wa_out.BitsPerSample = wa_IN_Start.BitsPerSample;
wa_out.Channels = wa_IN_Start.Channels;
wa_out.SampleRate = wa_IN_Start.SampleRate;
wa_out.WaveHeaderOUT(@strOutFile);
//Write data - modified code
byte[] arrfileStart = GetWAVEData(strStartFile);
byte[] arrfileEnd = GetWAVEData(strEndFile);
int intLngthofStart = arrfileStart.Length;
Array.Resize(ref arrfileStart, (arrfileStart.Length + arrfileEnd.Length));
Array.Copy(arrfileEnd, 0, arrfileStart, intLngthofStart, arrfileEnd.Length);
WriteWAVEData(strOutFile, ref arrfileStart);
}
catch (Exception ex)
{
throw ex;
return(false);
}
return(true);
}
/// <summary>
/// Filter out sielence or noise from wave file. The noise or silence frequencies are set in filter constants -
/// FILTER_FREQ_HIGH and FILTER_FREQ_LOW. For a given application, some experimentation may be required in
/// begining to decide the HIGH and LOW filter frequencies (alternate suggestion are most welcome).
/// </summary>
/// <param name="strPath">Path for wave file</param>
/// <returns>True/False</returns>
public bool StripSilence(string strPath)
{
if (strPath == null)
{
strPath = "";
}
if (strPath == "")
{
return(false);
}
clsWaveProcessor wain = new clsWaveProcessor();
clsWaveProcessor waout = new clsWaveProcessor();
waout.DataLength = waout.Length = 0;
if (!wain.WaveHeaderIN(@strPath))
{
return(false);
}
waout.DataLength = wain.DataLength;
waout.Length = wain.Length;
waout.BitsPerSample = wain.BitsPerSample;
waout.Channels = wain.Channels;
waout.SampleRate = wain.SampleRate;
byte[] arrfile = GetWAVEData(strPath);
//check for silence
int startpos = 0;
int endpos = arrfile.Length - 1;
//At start
try
{
for (int j = 0; j < arrfile.Length; j += 2)
{
short snd = ComplementToSigned(ref arrfile, j);
if (snd > FILTER_FREQ_LOW && snd < FILTER_FREQ_HIGH)
{
startpos = j;
}
else
{
break;
}
}
}
catch (Exception ex)
{
Console.Write(ex.Message);
}
//At end
for (int k = arrfile.Length - 1; k >= 0; k -= 2)
{
short snd = ComplementToSigned(ref arrfile, k - 1);
if (snd > FILTER_FREQ_LOW && snd < FILTER_FREQ_HIGH)
{
endpos = k;
}
else
{
break;
}
}
if (startpos == endpos)
{
return(false);
}
if ((endpos - startpos) < 1)
{
return(false);
}
byte[] newarr = new byte[(endpos - startpos) + 1];
for (int ni = 0, m = startpos; m <= endpos; m++, ni++)
{
newarr[ni] = arrfile[m];
}
//write file
waout.DataLength = newarr.Length;
waout.WaveHeaderOUT(@strPath);
WriteWAVEData(strPath, ref newarr);
return(true);
}
/// <summary>
/// Mix two wave files. The mixed data will be written back to the main wave file.
/// </summary>
/// <param name="strPath">Path for source or main wave file.</param>
/// <param name="strMixPath">Path for wave file to be mixed with source.</param>
/// <returns>True/False</returns>
public bool WaveMix(string strPath, string strMixPath)
{
if (strPath == null)
{
strPath = "";
}
if (strPath == "")
{
return(false);
}
if (strMixPath == null)
{
strMixPath = "";
}
if (strMixPath == "")
{
return(false);
}
clsWaveProcessor wain = new clsWaveProcessor();
clsWaveProcessor wamix = new clsWaveProcessor();
clsWaveProcessor waout = new clsWaveProcessor();
wain.DataLength = wamix.Length = 0;
if (!wain.WaveHeaderIN(strPath))
{
return(false);
}
if (!wamix.WaveHeaderIN(strMixPath))
{
return(false);
}
waout.DataLength = wain.DataLength;
waout.Length = wain.Length;
waout.BitsPerSample = wain.BitsPerSample;
waout.Channels = wain.Channels;
waout.SampleRate = wain.SampleRate;
byte[] arrfile = GetWAVEData(strPath);
byte[] arrmix = GetWAVEData(strMixPath);
for (int j = 0, k = 0; j < arrfile.Length; j += 2, k += 2)
{
if (k >= arrmix.Length)
{
k = 0;
}
short snd1 = ComplementToSigned(ref arrfile, j);
short snd2 = ComplementToSigned(ref arrmix, k);
short o = 0;
// ensure the value is within range of signed short
if ((snd1 + snd2) >= -32768 && (snd1 + snd2) <= 32767)
{
o = Convert.ToInt16(snd1 + snd2);
}
byte[] b = SignedToComplement(o);
arrfile[j] = b[0];
arrfile[j + 1] = b[1];
}
//write mixed file
waout.WaveHeaderOUT(@strPath);
WriteWAVEData(strPath, ref arrfile);
return(true);
}
/// <summary>
/// Increase or decrease volume of a wave file by percentage
/// </summary>
/// <param name="strPath">Source wave</param>
/// <param name="booIncrease">True - Increase, False - Decrease</param>
/// <param name="shtPcnt">1-100 in %-age</param>
/// <returns>True/False</returns>
public bool ChangeVolume(string strPath, bool booIncrease, short shtPcnt)
{
if (strPath == null)
{
strPath = "";
}
if (strPath == "")
{
return(false);
}
if (shtPcnt > 100)
{
return(false);
}
clsWaveProcessor wain = new clsWaveProcessor();
clsWaveProcessor waout = new clsWaveProcessor();
waout.DataLength = waout.Length = 0;
if (!wain.WaveHeaderIN(@strPath))
{
return(false);
}
waout.DataLength = wain.DataLength;
waout.Length = wain.Length;
waout.BitsPerSample = wain.BitsPerSample;
waout.Channels = wain.Channels;
waout.SampleRate = wain.SampleRate;
byte[] arrfile = GetWAVEData(strPath);
//change volume
for (int j = 0; j < arrfile.Length; j += 2)
{
short snd = ComplementToSigned(ref arrfile, j);
try
{
short p = Convert.ToInt16((snd * shtPcnt) / 100);
if (booIncrease)
{
snd += p;
}
else
{
snd -= p;
}
}
catch
{
snd = ComplementToSigned(ref arrfile, j);
}
byte[] newval = SignedToComplement(snd);
if ((newval[0] != null) && (newval[1] != null))
{
arrfile[j] = newval[0];
arrfile[j + 1] = newval[1];
}
}
//write back to the file
waout.DataLength = arrfile.Length;
waout.WaveHeaderOUT(@strPath);
WriteWAVEData(strPath, ref arrfile);
return(true);
}
