public static void ADPCM2Wav(byte[] data, int sampleRate, Stream output)
{
RiffTags riff = new RiffTags()
{
FileType = "WAVE",
};
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);
/*Deinterleave(adpcm);
* 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);
WaveFmt fmt = new WaveFmt {
Format = 1,
Channels = 2,
SampleRate = sampleRate * 1,
BitsPerSample = 16,
};
fmt.UpdateValues();
riff["fmt "] = new RiffTag("fmt ", fmt.ToBytes());
riff["data"] = new RiffTag("data", wavData);
riff.Save(output);
}
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);
}
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);
}
