public static void ADPCM2Wav(Stream input, Stream output)
{
RiffTags riff = new RiffTags(input);
// Remove unnecissary tags
foreach (string key in riff.Keys.ToArray())
{
if (key != "fmt " && key != "data")
{
riff.Remove(key);
}
}
if (riff.FileType != "WAVE")
{
throw new Exception("Input is not a WAVE file!");
}
WaveFmt fmt = WaveFmt.Read(riff["fmt "].Data);
if (fmt.Format != 20)
{
throw new Exception("Input is not ADPCM format!");
}
if (fmt.Channels != 2)
{
throw new Exception("Input does not have 2 channels!");
}
if (fmt.BitsPerSample != 4)
{
throw new Exception("Input does not have 4 bits per sample!");
}
byte[] data = riff["data"].Data;
byte[] adpcm = new byte[data.Length];
short[] wavSamples = new short[data.Length * 2];
Buffer.BlockCopy(data, 0, adpcm, 0, data.Length);
ADPCM2PCM2(wavSamples, 0, adpcm, 0);
ADPCM2PCM(wavSamples, 0, adpcm, 0, adpcm.Length / 2);
ADPCM2PCM(wavSamples, wavSamples.Length / 2, adpcm, adpcm.Length / 2, adpcm.Length / 2);
//Interleave(wavSamples);
byte[] wavData = new byte[wavSamples.Length * sizeof(short)];
Buffer.BlockCopy(wavSamples, 0, wavData, 0, wavData.Length);
fmt.Format = 1;
fmt.BitsPerSample = 16;
fmt.UpdateValues();
riff["fmt "] = new RiffTag("fmt ", fmt.ToBytes());
riff["data"] = new RiffTag("data", wavData);
riff.Save(output);
}
private static byte[] ReadADPCM(string file, ref int convSampleRate, bool ffmpeg)
{
try {
using (FileStream stream = File.OpenRead(file)) {
RiffTags riff = new RiffTags(stream);
if (riff.FileType != "WAVE")
{
throw new Exception("File is a not a wave file!");
}
byte[] fmt = riff["fmt "].Data;
short type = BitConverter.ToInt16(fmt, 0);
if (type != 20)
{
throw new Exception("File file is not ADPCM!");
}
short channels = BitConverter.ToInt16(fmt, 2);
int sampleRate = BitConverter.ToInt32(fmt, 4);
int bitsPerSample = BitConverter.ToInt16(fmt, 14);
if (type == 20 && channels >= 1 && channels <= 2 && sampleRate <= 4000 && bitsPerSample == 4)
{
convSampleRate = sampleRate;
byte[] data = riff["data"].Data;
byte[] newData = new byte[data.Length];
int halfLength = data.Length / 2;
for (int i = 0, j = 0; i < data.Length; i += 2, j++)
{
newData[i + 0] = data[j];
newData[i + 1] = data[halfLength + j];
}
return(newData);
}
//else if (ffmpeg) {
throw new Exception("Unexpected ffmpeg output!");
//}
}
}
catch (FileNotFoundException) {
throw;
}
catch (Exception ex) {
//if (ffmpeg)
throw;
}
return(Convert(file, convSampleRate));
}
public static byte[] Wav2ADPCMData(Stream input, out int sampleRate)
{
RiffTags riff = new RiffTags(input);
// Remove unnecissary tags
foreach (string key in riff.Keys.ToArray())
{
if (key != "fmt " && key != "data")
{
riff.Remove(key);
}
}
if (riff.FileType != "WAVE")
{
throw new Exception("Input is not a WAVE file!");
}
WaveFmt fmt = WaveFmt.Read(riff["fmt "].Data);
if (fmt.Format != 1)
{
throw new Exception("Input is not PCM format!");
}
if (fmt.Channels != 2)
{
throw new Exception("Input does not have 2 channels!");
}
if (fmt.BitsPerSample != 16)
{
throw new Exception("Input does not have 16 bits per sample!");
}
byte[] data = riff["data"].Data;
short[] wavSamples = new short[data.Length / 2];
byte[] adpcm = new byte[data.Length / 4];
Buffer.BlockCopy(data, 0, wavSamples, 0, data.Length);
/*Deinterleave(wavSamples);
* PCM2ADPCM(adpcm, 0, wavSamples, 0, adpcm.Length / 2);
* PCM2ADPCM(adpcm, adpcm.Length / 2, wavSamples, wavSamples.Length / 2, adpcm.Length / 2);*/
PCM2ADPCM2(adpcm, 0, wavSamples, 0);
sampleRate = fmt.SampleRate;
return(adpcm);
}
private static byte[] ReadPCM(string file, ref int convSampleRate, bool ffmpeg)
{
try {
using (FileStream stream = File.OpenRead(file)) {
RiffTags riff = new RiffTags(stream);
if (riff.FileType != "WAVE")
{
throw new Exception("File is a not a wave file!");
}
byte[] fmt = riff["fmt "].Data;
short type = BitConverter.ToInt16(fmt, 0);
if (type != 1)
{
throw new Exception("Wave file is not PCM!");
}
short channels = BitConverter.ToInt16(fmt, 2);
int sampleRate = BitConverter.ToInt32(fmt, 4);
int bitsPerSample = BitConverter.ToInt16(fmt, 14);
if (type == 1 && channels == 1 && sampleRate <= 4000 && bitsPerSample == 8)
{
convSampleRate = sampleRate;
return(UnsignedToSigned8BitPCM(riff["data"].Data));
}
else if (ffmpeg)
{
throw new Exception("Unexpected ffmpeg output!");
}
}
}
catch (FileNotFoundException) {
throw;
}
catch (Exception ex) {
if (ffmpeg)
{
throw;
}
}
return(Convert(file, convSampleRate));
}
public static byte[] Wav2PCMs8Data(Stream input, out int sampleRate)
{
RiffTags riff = new RiffTags(input);
// Remove unnecissary tags
foreach (string key in riff.Keys.ToArray())
{
if (key != "fmt " && key != "data")
{
riff.Remove(key);
}
}
if (riff.FileType != "WAVE")
{
throw new Exception("Input is not a WAVE file!");
}
WaveFmt fmt = WaveFmt.Read(riff["fmt "].Data);
if (fmt.Format != 1)
{
throw new Exception("Input is not PCM format!");
}
if (fmt.Channels != 2)
{
throw new Exception("Input does not have 2 channels!");
}
if (fmt.BitsPerSample != 16)
{
throw new Exception("Input does not have 16 bits per sample!");
}
byte[] data = riff["data"].Data;
short[] wavSamples = new short[data.Length / 2];
Buffer.BlockCopy(data, 0, wavSamples, 0, data.Length);
int pcmLength = data.Length / 2;
if (pf.HasFlag(PCMFlags.S16LE) || pf.HasFlag(PCMFlags.S16BE))
{
pcmLength *= 2;
}
if (pf.HasFlag(PCMFlags.MonoL) || pf.HasFlag(PCMFlags.MonoR))
{
pcmLength /= 2;
}
byte[] pcm = new byte[pcmLength];
if (pf.HasFlag(PCMFlags.Deinterleave))
{
Deinterleave(wavSamples);
}
for (int w = 0, p = 0; w < wavSamples.Length; w += 2, p += 2)
{
short sample = 0;
if (pf.HasFlag(PCMFlags.MonoLR))
{
sample = (short)((wavSamples[w + 0] + wavSamples[w + 1]) / 2);
}
else if (pf.HasFlag(PCMFlags.MonoR))
{
sample = wavSamples[w + 1];
}
else if (pf.HasFlag(PCMFlags.MonoL))
{
sample = wavSamples[w + 0];
}
else
{
sample = wavSamples[w];
w--;
}
if (pf.HasFlag(PCMFlags.S16LE))
{
//Signed 16-bit LITTLE ENDIAN:
pcm[p + 0] = unchecked ((byte)(sample & 0xFF));
pcm[p + 1] = unchecked ((byte)((sample >> 8) & 0xFF));
}
else if (pf.HasFlag(PCMFlags.S16BE))
{
//Signed 16-bit BIG ENDIAN:
pcm[p + 0] = unchecked ((byte)((sample >> 8) & 0xFF));
pcm[p + 1] = unchecked ((byte)(sample & 0xFF));
}
else
{
//Signed 8-bit:
pcm[p] = unchecked ((byte)((sample >> 8) & 0xFF));
p--;
}
}
/*int outSampleCount = wavSamples
* //byte[] pcm = new byte[data.Length / 2];//;
* bool? s16e = true;// null;
* //s16e (stereo)
* if (s16e.HasValue)
* pcm = new byte[data.Length];
* //pcm = new byte[data.Length];
* //s16e = true;
* //s8 (stereo)
* //pcm = new byte[data.Length / 2];
* //byte[] pcm = new byte[data.Length / 4];
* Buffer.BlockCopy(data, 0, wavSamples, 0, data.Length);
*
* //Deinterleave(wavSamples);
* //PCM2ADPCM(adpcm, 0, wavSamples, 0, adpcm.Length / 2);
* //PCM2ADPCM(adpcm, adpcm.Length / 2, wavSamples, wavSamples.Length / 2, adpcm.Length / 2);
* PCM2PCMs82(pcm, 0, wavSamples, 0, s16e);*/
sampleRate = fmt.SampleRate;
return(pcm);
}
public static bool MaximizeWavVolume(string inputFile, out string outputFile)
{
RiffTags riff = new RiffTags(inputFile);
// Remove unnecissary tags
foreach (string key in riff.Keys.ToArray())
{
if (key != "fmt " && key != "data")
{
riff.Remove(key);
}
}
if (riff.FileType != "WAVE")
{
throw new Exception("Input is not a WAVE file!");
}
WaveFmt fmt = WaveFmt.Read(riff["fmt "].Data);
if (fmt.Format != 1)
{
throw new Exception("Input is not PCM format!");
}
if (fmt.Channels != 2)
{
throw new Exception("Input does not have 2 channels!");
}
if (fmt.BitsPerSample != 16)
{
throw new Exception("Input does not have 16 bits per sample!");
}
if (fmt.SampleRate > 5000)
{
throw new Exception("Sample rate must be 5000Hz or less!");
}
byte[] data = riff["data"].Data;
short[] wavSamples = new short[data.Length / 2];
Buffer.BlockCopy(data, 0, wavSamples, 0, data.Length);
short max = 0;
short min = 0;
for (int i = 0; i < wavSamples.Length; i++)
{
max = Math.Max(max, wavSamples[i]);
min = Math.Min(min, wavSamples[i]);
}
// Silent File
if (min == 0 && max == 0)
{
outputFile = inputFile;
return(false);
}
// Lazy maximum volume checking
const short range = 32;
if (min <= (short.MinValue + range) || max >= (short.MaxValue - range))
{
outputFile = inputFile;
return(false);
}
double maxScale = (double)short.MaxValue / max;
double minScale = (double)short.MinValue / min;
double scale = Math.Min(maxScale, minScale);
for (int i = 0; i < wavSamples.Length; i++)
{
wavSamples[i] = (short)(wavSamples[i] * scale);
}
byte[] wavData = new byte[wavSamples.Length * sizeof(short)];
Buffer.BlockCopy(wavSamples, 0, wavData, 0, wavData.Length);
outputFile = Path.Combine(Directory.GetCurrentDirectory(), "wiimote.maximized.wav");
riff["data"] = new RiffTag("data", wavData);
riff.Save(outputFile);
return(false);
}
