private static Tuple<int, string> WavToFlacHelper(WAVReader audioSource, string targetFlacPath)
{
int sampleRate;
AudioBuffer buffer = new AudioBuffer(audioSource, 0x10000);
FlakeWriterSettings settings = new FlakeWriterSettings();
settings.PCM = audioSource.PCM;
FlakeWriter audioDestination = new FlakeWriter(targetFlacPath, settings);
while (audioSource.Read(buffer, -1) != 0)
{
audioDestination.Write(buffer);
}
sampleRate = settings.PCM.SampleRate;
audioDestination.Close();
audioSource.Close();
return new Tuple<int, string>(sampleRate, targetFlacPath);
}
private byte[] Wav2FlacBuffConverter(byte[] Buffer)
{
Stream OutWavStream = new MemoryStream();
Stream OutFlacStream = new MemoryStream();
AudioPCMConfig pcmconf = new AudioPCMConfig(16, 1, 16000);
WAVWriter wr = new WAVWriter(null, OutWavStream, pcmconf);
wr.Write(new AudioBuffer(pcmconf, Buffer, Buffer.Length / 2));
OutWavStream.Seek(0, SeekOrigin.Begin);
WAVReader audioSource = new WAVReader(null, OutWavStream);
if (audioSource.PCM.SampleRate != 16000)
return null;
AudioBuffer buff = new AudioBuffer(audioSource, 0x10000);
FlakeWriter flakeWriter = new FlakeWriter(null, OutFlacStream, audioSource.PCM);
flakeWriter.CompressionLevel = 8;
while (audioSource.Read(buff, -1) != 0)
{
flakeWriter.Write(buff);
}
OutFlacStream.Seek(0, SeekOrigin.Begin);
byte[] barr = new byte[OutFlacStream.Length];
OutFlacStream.Read(barr, 0, (int)OutFlacStream.Length);
return barr;
}
public async Task TestWriting()
{
var wavStream =
await
(await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///test.wav")))
.OpenStreamForReadAsync();
var expectedBytes =
ReadFully(await
(await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///flake.flac")))
.OpenStreamForReadAsync());
var buff = WAVReader.ReadAllSamples(wavStream);
FlakeWriter target;
var outputStream = new MemoryStream();
target = new FlakeWriter(outputStream, new FlakeWriterSettings { PCM = buff.PCM, EncoderMode = "7" });
target.Settings.Padding = 1;
target.DoSeekTable = false;
target.Write(buff);
target.Close();
outputStream.Seek(0, SeekOrigin.Begin);
var resultContent = outputStream.ToArray();
var outStream = await ApplicationData.Current.LocalFolder.OpenStreamForWriteAsync("out.flac",
CreationCollisionOption.ReplaceExisting);
outStream.Write(resultContent, 0, resultContent.Length);
outStream.Dispose();
Debug.WriteLine(ApplicationData.Current.LocalFolder.Path);
CollectionAssert.AreEqual(expectedBytes, outputStream.ToArray(), "result and expected doesn't match.");
}
public void TestWriting()
{
AudioBuffer buff = WAVReader.ReadAllSamples("test.wav", null);
FlakeWriter target;
target = new FlakeWriter("flakewriter0.flac", null, new FlakeWriterSettings { PCM = buff.PCM, EncoderMode = "7" });
target.Settings.Padding = 1;
target.DoSeekTable = false;
//target.Vendor = "CUETools";
//target.CreationTime = DateTime.Parse("15 Aug 1976");
target.FinalSampleCount = buff.Length;
target.Write(buff);
target.Close();
//CollectionAssert.AreEqual(File.ReadAllBytes("flake.flac"), File.ReadAllBytes("flakewriter0.flac"), "flakewriter0.flac doesn't match.");
target = new FlakeWriter("flakewriter1.flac", null, new FlakeWriterSettings { PCM = buff.PCM, EncoderMode = "7" });
target.Settings.Padding = 1;
target.DoSeekTable = false;
//target.Vendor = "CUETools";
//target.CreationTime = DateTime.Parse("15 Aug 1976");
target.Write(buff);
target.Close();
CollectionAssert.AreEqual(File.ReadAllBytes("flake.flac"), File.ReadAllBytes("flakewriter1.flac"), "flakewriter1.flac doesn't match.");
}
private void ConvertToFlac(Stream sourceStream, Stream destinationStream) {
var audioSource = new WAVReader(null, sourceStream);
try {
if (audioSource.PCM.SampleRate != 16000) {
throw new InvalidOperationException("Incorrect frequency - WAV file must be at 16 KHz.");
}
var buff = new AudioBuffer(audioSource, 0x10000);
var flakeWriter = new FlakeWriter(null, destinationStream, audioSource.PCM);
// flakeWriter.CompressionLevel = 8;
while (audioSource.Read(buff, -1) != 0) {
flakeWriter.Write(buff);
}
flakeWriter.Close();
}
finally {
audioSource.Close();
}
}
/// <summary>
/// Convert stream of wav to flac format and send it to google speech recognition service.
/// </summary>
/// <param name="stream">wav stream</param>
/// <returns>recognized result</returns>
/// // Step 1- Converts wav stream to flac
public static string WavStreamToGoogle(Stream stream)
{
FlakeWriter audioDest = null;
IAudioSource audioSource = null;
string answer;
try
{
var outStream = new MemoryStream();
stream.Position = 0;
audioSource = new WAVReader("", stream);
var buff = new AudioBuffer(audioSource, 0x10000);
audioDest = new FlakeWriter("", outStream, audioSource.PCM);
var sampleRate = audioSource.PCM.SampleRate;
while (audioSource.Read(buff, -1) != 0)
{
audioDest.Write(buff);
}
answer = GoogleRequest(outStream, sampleRate);
}
finally
{
if (audioDest != null) audioDest.Close();
if (audioSource != null) audioSource.Close();
}
return answer;
}
/// <summary>
/// Convert .wav file to .flac file with the same name
/// </summary>
/// <param name="WavName">path to .wav file</param>
/// <returns>Sample Rate of converted .flac</returns>
public static int Wav2Flac(string WavName)
{
int sampleRate;
var flacName = Path.ChangeExtension(WavName, "flac");
FlakeWriter audioDest = null;
IAudioSource audioSource = null;
try
{
audioSource = new WAVReader(WavName, null);
AudioBuffer buff = new AudioBuffer(audioSource, 0x10000);
audioDest = new FlakeWriter(flacName, audioSource.PCM);
sampleRate = audioSource.PCM.SampleRate;
while (audioSource.Read(buff, -1) != 0)
{
audioDest.Write(buff);
}
}
finally
{
if (audioDest != null) audioDest.Close();
if (audioSource != null) audioSource.Close();
}
return sampleRate;
}
private static byte[] WaveSamplesToFlake(byte[] combinedChunks)
{
var audioBuffer = new AudioBuffer(new AudioPCMConfig(16, 1, 22050), combinedChunks, combinedChunks.Length/2);
byte[] flakeBuffer;
using (var flakeStream = new MemoryStream())
{
var flakeWriter = new FlakeWriter(null, flakeStream,
new FlakeWriterSettings {PCM = audioBuffer.PCM, EncoderMode = "7"});
flakeWriter.Settings.Padding = 1;
flakeWriter.DoSeekTable = false;
flakeWriter.FinalSampleCount = audioBuffer.Length;
flakeWriter.Write(audioBuffer);
flakeStream.Position = 0;
using (var br = new BinaryReader(flakeStream))
{
flakeBuffer = new byte[flakeStream.Length];
br.Read(flakeBuffer, 0, flakeBuffer.Length);
}
}
return flakeBuffer;
}
