static void Main(string[] args) { //Debug test //args = (@"E:\Mijn documenten\Visual Studio 2010\ADPCMEncoder\~24000HZTEST.wav|test").Split(Convert.ToChar("|")); //args = (@"E:\Mijn documenten\Visual Studio 2010\ADPCMEncoder\TestFiles\LoadingSNOW.wav|test").Split(Convert.ToChar("|")); //Print header Console.WriteLine("================="); Console.WriteLine("IMA ADPCM Encoder"); Console.WriteLine(" by Flitskikker"); Console.WriteLine("================="); Console.WriteLine(""); //Check args if(args.Length == 0){ //No args Console.WriteLine("ERROR: No command line arguments passed. Press any key to exit..."); Console.ReadLine(); Environment.Exit(1); } //Check file if(!File.Exists(args[0])){ //File not found Console.WriteLine("ERROR: File \"" + args[0] + "\" not found. Press any key to exit..."); Console.ReadLine(); Environment.Exit(2); } //Print file Console.WriteLine("File: " + args[0]); Console.WriteLine(""); //Load file WAVFile wav = new WAVFile(); wav.Open(args[0], WAVFile.WAVFileMode.READ); //Show WAV info Console.WriteLine("WAV Info:"); Console.WriteLine("\tBits per sample:\t" + wav.BitsPerSample.ToString() + " bits"); Console.WriteLine("\tBytes per sample:\t" + wav.BytesPerSample.ToString()); Console.WriteLine("\tBytes per second:\t" + wav.BytesPerSec.ToString()); Console.WriteLine("\tData size:\t\t" + wav.DataSizeBytes.ToString() + " bytes"); Console.WriteLine("\tDuration:\t\t" + Math.Round(Convert.ToDecimal((double)wav.NumSamples / (double)wav.SampleRateHz), 2).ToString() + " seconds (" + Utils.getDurationString(wav.NumSamples, wav.SampleRateHz) + ")"); Console.WriteLine("\tEncoding type:\t\t" + wav.EncodingType.ToString()); Console.WriteLine("\tFile size:\t\t" + wav.FileSizeBytes.ToString() + " bytes"); Console.WriteLine("\t# of channels:\t\t" + wav.NumChannels.ToString()); Console.WriteLine("\t# of samples:\t\t" + wav.NumSamples.ToString()); Console.WriteLine("\tRIFF type:\t\t" + wav.RIFFTypeString); Console.WriteLine("\tSample Rate:\t\t" + wav.SampleRateHz.ToString() + " Hz"); Console.WriteLine("\tWAV header:\t\t" + wav.WAVHeaderString); Console.WriteLine(""); //Check bits if(wav.BitsPerSample != 16){ //Not 16 bits Console.WriteLine("ERROR: WAV should have 16 bits per sample. Press any key to exit..."); Console.ReadLine(); Environment.Exit(1); } //Check bytes per sample if(wav.BytesPerSample / wav.NumChannels != 2){ //Not 2 bytes Console.WriteLine("ERROR: WAV should have (wav.NumChannels * 2) bytes per sample. Press any key to exit..."); Console.ReadLine(); Environment.Exit(1); } //Print message Console.WriteLine("Ready to go! Press any key when ready..."); //Wait for input Console.ReadLine(); if(wav.NumChannels > 1){ //Split channels Console.WriteLine(""); Console.WriteLine("Saving separate channels..."); Console.WriteLine(""); List<WAVFile> wavs = new List<WAVFile>(); for (int c = 0; c < wav.NumChannels; c++) { wavs.Add(new WAVFile()); wavs[c].Create(Path.GetDirectoryName(args[0]) + "\\" + Path.GetFileNameWithoutExtension(args[0]) + "_" + (c + 1).ToString() + ".wav", false, wav.SampleRateHz, wav.BitsPerSample, true); } int numSamplesCorrected = ((wav.DataSizeBytes - 8) / wav.BytesPerSample); //for (long i = 0; i < wav.NumSamples / wav.NumChannels; i++) { for (long i = 0; i < numSamplesCorrected; i++) { for (int c = 0; c < wav.NumChannels; c++) { wavs[c].AddSample_16bit(wav.GetNextSampleAs16Bit()); } } for (int c = 0; c < wav.NumChannels; c++) { wavs[c].Close(); } } //Encode Console.WriteLine(""); Console.WriteLine("Encoding file(s)..."); Console.WriteLine(""); IMAADPCM.ADPCMState state = new IMAADPCM.ADPCMState(); WAVFile cwav = new WAVFile(); int nc = wav.NumChannels; for (int c = 0; c < wav.NumChannels; c++) { Console.WriteLine("Encoding file: " + Path.GetDirectoryName(args[0]) + "\\" + Path.GetFileNameWithoutExtension(args[0]) + "_" + (c + 1).ToString() + ".bin"); MemoryStream ms = new MemoryStream(); cwav = new WAVFile(); // Open splitted WAV if(wav.NumChannels > 1){ cwav.Open(Path.GetDirectoryName(args[0]) + "\\" + Path.GetFileNameWithoutExtension(args[0]) + "_" + (c + 1).ToString() + ".wav", WAVFile.WAVFileMode.READ_WRITE); }else{ cwav = wav; //wav.Close(); //cwav.Open(args[0], WAVFile.WAVFileMode.READ_WRITE); } byte[] bytes = new byte[2]; int loopValue = ((cwav.DataSizeBytes - 8) / cwav.BytesPerSample); //Actual encode for (long i = 0; i < loopValue / 2; i++) { bytes[0] = IMAADPCM.encodeADPCM(cwav.GetNextSampleAs16Bit(), ref state); bytes[1] = IMAADPCM.encodeADPCM(cwav.GetNextSampleAs16Bit(), ref state); ms.Write(BitConverter.GetBytes(Convert.ToInt32(Utils.binaryString(bytes[1], 4) + Utils.binaryString(bytes[0], 4), 2)), 0, 1); } //Get WAV data byte[] dataWAV = new byte[ms.Length]; ms.Seek(0, SeekOrigin.Begin); ms.Read(dataWAV, 0, (int)ms.Length); ms.Close(); //Create file FileStream fs = new FileStream(Path.GetDirectoryName(args[0]) + "\\" + Path.GetFileNameWithoutExtension(args[0]) + "_" + (c + 1).ToString() + ".bin", FileMode.Create, FileAccess.ReadWrite); //Write sample fs.Seek(0, SeekOrigin.Begin); fs.Write(dataWAV, 0, dataWAV.Length); //Close cwav.Close(); ms.Close(); fs.Close(); if (nc == 1) break; } //Close WAV file wav.Close(); //Print message Console.WriteLine(""); Console.WriteLine("Done! Press any key to exit..."); //Wait for input Console.ReadLine(); //Exit Environment.Exit(0); }
/// <summary> /// Returns the highest sample value in a WAV audio file. /// The return value is a byte array and will contain one /// byte if the file contains 8-bit audio or 2 bytes if the file /// contains 16-bit audio. The return value will be null if /// the file cannot be opened. If it is known that the audio /// file contains 16-bit samples, the byte array can be converted /// to a 16-bit integer using BitConverter.ToInt16(). /// </summary> /// <param name="pFilename">The name of the WAV file</param> /// <param name="pBitsPerSample">This will contain the number of bits per sample, or 0 if the file wasn't loaded.</param> /// <returns>A byte array containing the highest audio sample, or null if the file wasn't loaded.</returns> public static byte[] HighestSampleValue(String pFilename, out short pBitsPerSample) { pBitsPerSample = 0; byte[] highestSampleValue = null; WAVFile audioFile = new WAVFile(); try { if (audioFile.Open(pFilename, WAVFileMode.READ) == "") { pBitsPerSample = audioFile.mBitsPerSample; if (audioFile.mBitsPerSample == 8) { byte sample = 0; byte highestSample = 0; for (int i = 0; i < audioFile.NumSamples; ++i) { sample = audioFile.GetNextSample_8bit(); if (sample > highestSample) highestSample = sample; } highestSampleValue = new byte[1]; highestSampleValue[0] = highestSample; } else if (audioFile.mBitsPerSample == 16) { short sample = 0; short highestSample = 0; for (int i = 0; i < audioFile.NumSamples; ++i) { sample = audioFile.GetNextSample_16bit(); if (sample > highestSample) highestSample = sample; } highestSampleValue = BitConverter.GetBytes(highestSample); if (!BitConverter.IsLittleEndian) Array.Reverse(highestSampleValue); } audioFile.Close(); } } catch (Exception) { } return (highestSampleValue); }
/// <summary> /// Returns the highest sample value in a WAV file, as a 16-bit value, regardless of /// whether the file contains 8-bit or 16-bit audio. If the sample is coming from /// an 8-bit audio file, the sample will be scaled up from 8-bit to 16-bit. /// </summary> /// <param name="pFilename">The audio file name</param> /// <returns>The highest sample value from the file, as a 16-bit value</returns> public static short HighestSampleValueAs16Bit(String pFilename) { short highestSample = 0; try { WAVFile audioFile = new WAVFile(); if (audioFile.Open(pFilename, WAVFileMode.READ) == "") { if (audioFile.BitsPerSample == 8) { short sample = 0; for (int i = 0; i < audioFile.NumSamples; ++i) { sample = ScaleByteToShort(audioFile.GetNextSample_8bit()); if (sample > highestSample) highestSample = sample; } } else if (audioFile.BitsPerSample == 16) { short sample = 0; for (int i = 0; i < audioFile.NumSamples; ++i) { sample = audioFile.GetNextSample_16bit(); if (sample > highestSample) highestSample = sample; } } audioFile.Close(); } } catch (Exception) { } return highestSample; }
/// <summary> /// Returns the highest number of bits per sample in a set of audio files. /// </summary> /// <param name="pFilenames">An array containing the audio file names</param> /// <returns>The highest number of bits per sample in the set of audio files</returns> public static short HighestBitsPerSample(String[] pFilenames) { short bitsPerSample = 0; if (pFilenames != null) { WAVFile audioFile = new WAVFile(); String retval = ""; foreach (String filename in pFilenames) { try { retval = audioFile.Open(filename, WAVFileMode.READ); if (retval == "") { if (audioFile.BitsPerSample > bitsPerSample) bitsPerSample = audioFile.BitsPerSample; audioFile.Close(); } } catch (Exception) { } } } return bitsPerSample; }
/// <summary> /// Returns the highest number of channels in a set of audio files. /// </summary> /// <param name="pFilenames">An array containing the audio file names</param> /// <returns>The highest number of channels in the set of audio files</returns> public static byte HighestNumChannels(String[] pFilenames) { byte numChannels = 0; if (pFilenames != null) { WAVFile audioFile = new WAVFile(); String retval = ""; foreach (String filename in pFilenames) { try { retval = audioFile.Open(filename, WAVFileMode.READ); if (retval == "") { if (audioFile.NumChannels > numChannels) numChannels = audioFile.NumChannels; audioFile.Close(); } } catch (Exception) { } } } return numChannels; }
/// <summary> /// Returns a WAVFormat struct containing audio format information /// (# channels, sample rate, and bits per sample) for a WAV file. /// </summary> /// <param name="pFilename">The name of the file about which to retrieve format information</param> /// <returns>A WAVFormat struct object containing the audio format information for the open file</returns> public static WAVFormat GetAudioFormat(String pFilename) { WAVFormat format = new WAVFormat(); WAVFile audioFile = new WAVFile(); if (audioFile.Open(pFilename, WAVFileMode.READ) == "") { format.BitsPerSample = audioFile.mBitsPerSample; format.NumChannels = audioFile.mNumChannels; format.SampleRateHz = audioFile.mSampleRateHz; audioFile.Close(); } return (format); }
/// <summary> /// Converts a WAV file's bits/sample and number of channels to a separate WAV file. /// </summary> /// <param name="pSrcFilename">The name of the file to convert</param> /// <param name="pDestFilename">The destination file name</param> /// <param name="pBitsPerSample">The destination's number of bits/sample</param> /// <param name="pStereo">Whether or not the destination should be stereo</param> /// <param name="pVolumeMultiplier">A multiplier that can be used to adjust the volume of the output audio file</param> public static void CopyAndConvert(String pSrcFilename, String pDestFilename, short pBitsPerSample, bool pStereo, double pVolumeMultiplier) { WAVFile srcFile = new WAVFile(); String retval = srcFile.Open(pSrcFilename, WAVFileMode.READ); if (retval != "") throw new WAVFileException(retval, "WAVFile.Convert_Copy()"); WAVFile destFile = new WAVFile(); destFile.Create(pDestFilename, pStereo, srcFile.SampleRateHz, pBitsPerSample); if ((srcFile.BitsPerSample == 8) && (pBitsPerSample == 8)) { byte sample = 0; if (srcFile.IsStereo && !pStereo) { // 8-bit to 8-bit, stereo to mono: Average each 2 samples while (srcFile.NumSamplesRemaining > 0) { sample = (byte)((short)((short)srcFile.GetNextSample_8bit() + (short)srcFile.GetNextSample_8bit()) / 2); if (pVolumeMultiplier != 1.0) sample = (byte)((double)sample * pVolumeMultiplier); destFile.AddSample_8bit(sample); } } else if ((srcFile.IsStereo && pStereo) || (!srcFile.IsStereo && !pStereo)) { // 8-bit to 8-bit, stereo to stereo or mono to mono while (srcFile.NumSamplesRemaining > 0) { sample = srcFile.GetNextSample_8bit(); if (pVolumeMultiplier != 1.0) sample = (byte)((double)sample * pVolumeMultiplier); destFile.AddSample_8bit(sample); } } else if (!srcFile.IsStereo && pStereo) { // 8-bit to 8-bit, mono to stereo: Write each sample twice while (srcFile.NumSamplesRemaining > 0) { sample = srcFile.GetNextSample_8bit(); if (pVolumeMultiplier != 1.0) sample = (byte)((double)sample * pVolumeMultiplier); destFile.AddSample_8bit(sample); destFile.AddSample_8bit(sample); } } } else if ((srcFile.BitsPerSample == 8) && (pBitsPerSample == 16)) { short sample = 0; if (srcFile.IsStereo && !pStereo) { // 8-bit to 16 bit, stereo to mono: Average each 2 samples while (srcFile.NumSamplesRemaining > 0) { sample = (short)((int)((int)srcFile.GetNextSampleAs16Bit() + (int)srcFile.GetNextSampleAs16Bit()) / 2); if (pVolumeMultiplier != 1.0) sample = (short)((double)sample * pVolumeMultiplier); destFile.AddSample_16bit(sample); } } else if ((srcFile.IsStereo && pStereo) || (!srcFile.IsStereo && !pStereo)) { // 8-bit to 16 bit, stereo to stereo or mono to mono while (srcFile.NumSamplesRemaining > 0) { sample = srcFile.GetNextSampleAs16Bit(); if (pVolumeMultiplier != 1.0) sample = (short)((double)sample * pVolumeMultiplier); destFile.AddSample_16bit(sample); } } else if (!srcFile.IsStereo && pStereo) { // 8-bit to 16 bit, mono to stereo: Write each sample twice while (srcFile.NumSamplesRemaining > 0) { sample = srcFile.GetNextSampleAs16Bit(); if (pVolumeMultiplier != 1.0) sample = (short)((double)sample * pVolumeMultiplier); destFile.AddSample_16bit(sample); destFile.AddSample_16bit(sample); } } } else if ((srcFile.BitsPerSample == 16) && (pBitsPerSample == 8)) { byte sample = 0; if (srcFile.IsStereo && !pStereo) { // 16-bit to 8-bit, stereo to mono: Average each 2 samples short sample_16bit = 0; while (srcFile.NumSamplesRemaining > 0) { sample_16bit = (short)((int)srcFile.GetNextSample_16bit() + (int)srcFile.GetNextSample_16bit() / 2); if (pVolumeMultiplier != 1.0) sample_16bit = (short)((double)sample_16bit * pVolumeMultiplier); sample = ScaleShortToByte(sample_16bit); destFile.AddSample_8bit(sample); } } else if ((srcFile.IsStereo && pStereo) || (!srcFile.IsStereo && !pStereo)) { // 16-bit to 8-bit, stereo to stereo or mono to mono while (srcFile.NumSamplesRemaining > 0) { sample = ScaleShortToByte(srcFile.GetNextSample_16bit()); if (pVolumeMultiplier != 1.0) sample = (byte)((double)sample * pVolumeMultiplier); destFile.AddSample_8bit(sample); } } else if (!srcFile.IsStereo && pStereo) { // 16-bit to 8-bit, mono to stereo: Write each sample twice while (srcFile.NumSamplesRemaining > 0) { sample = ScaleShortToByte(srcFile.GetNextSample_16bit()); if (pVolumeMultiplier != 1.0) sample = (byte)((double)sample * pVolumeMultiplier); destFile.AddSample_8bit(sample); destFile.AddSample_8bit(sample); } } } else if ((srcFile.BitsPerSample == 16) && (pBitsPerSample == 16)) { short sample = 0; if (srcFile.IsStereo && !pStereo) { // 16-bit to 16-bit, stereo to mono: Average each 2 samples while (srcFile.NumSamplesRemaining > 0) { sample = (short)((int)((int)srcFile.GetNextSample_16bit() + (int)srcFile.GetNextSample_16bit()) / 2); if (pVolumeMultiplier != 1.0) sample = (short)((double)sample * pVolumeMultiplier); destFile.AddSample_16bit(sample); } } else if ((srcFile.IsStereo && pStereo) || (!srcFile.IsStereo && !pStereo)) { // 16-bit to 16-bit, stereo to stereo or mono to mono while (srcFile.NumSamplesRemaining > 0) { sample = srcFile.GetNextSample_16bit(); if (pVolumeMultiplier != 1.0) sample = (short)((double)sample * pVolumeMultiplier); destFile.AddSample_16bit(sample); } } else if (!srcFile.IsStereo && pStereo) { // 16-bit to 16-bit, mono to stereo: Write each sample twice while (srcFile.NumSamplesRemaining > 0) { sample = srcFile.GetNextSample_16bit(); if (pVolumeMultiplier != 1.0) sample = (short)((double)sample * pVolumeMultiplier); destFile.AddSample_16bit(sample); destFile.AddSample_16bit(sample); } } } destFile.Close(); srcFile.Close(); }
/// <summary> /// For 8-bit WAV files: Adjusts the volume level and converts it to a 16-bit audio file. /// The converted data is saved to a separate file. /// </summary> /// <param name="pSrcFilename">The name of the WAV file to convert</param> /// <param name="pDestFilename">The name to use for the converted WAV file</param> /// <param name="pMultiplier">The volume multiplier</param> public static void AdjustVolume_Copy_8BitTo16Bit(String pSrcFilename, String pDestFilename, double pMultiplier) { // If an empty source or destination file were passed in, then throw an exception. if (pSrcFilename == "") throw new WAVFileReadException("Blank filename specified.", "WAVFile.AdjustVolume_Copy_8BitTo16Bit()"); if (pDestFilename == "") throw new WAVFileWriteException("Blank filename specified.", "WAVFile.AdjustVolume_Copy_8BitTo16Bit()"); // Open the srouce file WAVFile srcFile = new WAVFile(); String retval = srcFile.Open(pSrcFilename, WAVFileMode.READ); if (retval == "") { // Check to make sure the input file has 8 bits per sample. If not, then throw an exception. if (srcFile.BitsPerSample != 8) { WAVFileBitsPerSampleException exc = new WAVFileBitsPerSampleException(pSrcFilename + ": 8 bits per sample required, and the file has " + srcFile.BitsPerSample.ToString() + " bits per sample.", "WAVFile.AdjustVolume_Copy_8BitTo16Bit()", srcFile.BitsPerSample); srcFile.Close(); throw exc; } // Open the destination file WAVFile destFile = new WAVFile(); destFile.Create(pDestFilename, srcFile.IsStereo, srcFile.SampleRateHz, 16, true); // Copy the data short sample_16bit = 0; while (srcFile.NumSamplesRemaining > 0) { // Scale the sample from 8-bit to 16 bits sample_16bit = ScaleByteToShort(srcFile.GetNextSample_8bit()); // Now, apply pMultiplier if it is not 1.0 if (pMultiplier != 1.0) sample_16bit = (short)((double)sample_16bit * pMultiplier); // Save the sample to the destination file destFile.AddSample_16bit(sample_16bit); } srcFile.Close(); destFile.Close(); } else throw new WAVFileReadException(retval, "WAVFile.AdjustVolume_Copy_8BitTo16Bit()"); }
/// <summary> /// Adjusts the volume level of a WAV file, saving the adjusted file as a separate file. /// </summary> /// <param name="pSrcFilename">The name of the WAV file to adjust</param> /// <param name="pDestFilename">The name to use for the volume-adjusted WAV file</param> /// <param name="pMultiplier">The value by which to multiply the audio samples</param> public static void AdjustVolume_Copy(String pSrcFilename, String pDestFilename, double pMultiplier) { // If an empty source or destination file were passed in, then throw an exception. if (pSrcFilename == "") throw new WAVFileReadException("Blank filename specified.", "WAVFile.AdjustVolume_Copy()"); if (pDestFilename == "") throw new WAVFileWriteException("Blank filename specified.", "WAVFile.AdjustVolume_Copy()"); // Open the srouce file WAVFile srcFile = new WAVFile(); String retval = srcFile.Open(pSrcFilename, WAVFileMode.READ); if (retval == "") { // Check to make sure the input file has a supported number of bits/sample and sample rate. If // not, then throw an exception. if (!SupportedBitsPerSample(srcFile.BitsPerSample)) { WAVFileBitsPerSampleException exc = new WAVFileBitsPerSampleException(pSrcFilename + " has unsupported bits/sample (" + srcFile.BitsPerSample.ToString() + ")", "WAVFile.AdjustVolume_Copy()", srcFile.BitsPerSample); srcFile.Close(); throw exc; } // Open the destination file and start copying the adjusted audio data to it. WAVFile destFile = new WAVFile(); destFile.Create(pDestFilename, srcFile.IsStereo, srcFile.SampleRateHz, srcFile.BitsPerSample); if (srcFile.BitsPerSample == 8) { byte sample = 0; for (int i = 0; i < srcFile.NumSamples; ++i) { // Note: Only multiply the sample if pMultiplier is not 1.0 (if the multiplier is // 1.0, then it would be good to avoid any binary roundoff error). sample = srcFile.GetNextSample_8bit(); if (pMultiplier != 1.0) sample = (byte)((double)sample * pMultiplier); destFile.AddSample_8bit(sample); } } else if (srcFile.BitsPerSample == 16) { short sample = 0; for (int i = 0; i < srcFile.NumSamples; ++i) { // Note: Only multiply the sample if pMultiplier is not 1.0 (if the multiplier is // 1.0, then it would be good to avoid any binary roundoff error). sample = srcFile.GetNextSample_16bit(); if (pMultiplier != 1.0) sample = (short)((double)sample * pMultiplier); destFile.AddSample_16bit(sample); } } srcFile.Close(); destFile.Close(); } else throw new WAVFileReadException(retval, "WAVFile.AdjustVolume_Copy()"); }
/// <summary> /// Changes the volume of a WAV file. /// </summary> /// <param name="pFilename">The name of the WAV file to adjust</param> /// <param name="pMultiplier">The volume multiplier</param> public static void AdjustVolumeInPlace(String pFilename, double pMultiplier) { // If pMultiplier is 1, then we don't need to do anything. if (pMultiplier == 1.0) return; // Open the file WAVFile audioFile = new WAVFile(); String retval = audioFile.Open(pFilename, WAVFileMode.READ_WRITE); if (retval == "") { // Check to make sure the input file has a supported number of bits/sample and sample rate. If // not, then throw an exception. if (!SupportedBitsPerSample(audioFile.BitsPerSample)) { short bitsPerSample = audioFile.BitsPerSample; audioFile.Close(); throw new WAVFileBitsPerSampleException(pFilename + " has unsupported bits/sample (" + bitsPerSample.ToString() + ")", "WAVFile.AdjustVolumeInPlace()", bitsPerSample); } if (!SupportedSampleRate(audioFile.SampleRateHz)) { int sampleRate = audioFile.SampleRateHz; audioFile.Close(); throw new WAVFileSampleRateException(pFilename + " has unsupported sample rate (" + sampleRate.ToString() + ")", "WAVFile.AdjustVolumeInPlace()", sampleRate); } // Adjust the file volume if (audioFile.BitsPerSample == 8) { byte sample = 0; for (int sampleNum = 0; sampleNum < audioFile.NumSamples; ++sampleNum) { sample = (byte)((double)audioFile.GetNextSample_8bit() * pMultiplier); audioFile.SeekToAudioSample(sampleNum); audioFile.AddSample_8bit(sample); } } else if (audioFile.BitsPerSample == 16) { short sample = 0; for (int sampleNum = 0; sampleNum < audioFile.NumSamples; ++sampleNum) { sample = (short)((double)audioFile.GetNextSample_16bit() * pMultiplier); audioFile.SeekToAudioSample(sampleNum); audioFile.AddSample_16bit(sample); } } audioFile.Close(); } else throw new WAVFileReadException(retval, "WAVFile.AdjustVolumeInPlace()"); }