public AudioStream(SampleFormat format, Synthesizer synth)
{
MMRESULT result;
var fmt = CreateFormatSpec(format, synth.SampleRate);
// Create output device
if ((result = waveOutOpen(ref _ptrOutputDevice, WAVE_MAPPER, ref fmt, WaveOutProc, IntPtr.Zero, WaveOutOpenFlags.CALLBACK_FUNCTION)) != MMRESULT.MMSYSERR_NOERROR)
throw new ExternalException($"Function 'waveOutOpen' returned error code {result}");
synth.TTS.AddActiveAudio(this);
_synth = synth;
}
public void Speak(string text)
{
// Actual speaking isn't supported yet. This is debug code for testing vocal properties.
var synth = new Synthesizer(this)
{
Fundamental = 165
};
const float amp = .015f;
const float tilt = -3.00f;
// Generate 100 harmonics
for (int i = 0; i < 100; i++)
synth.AddSampler(new HarmonicSampler(synth, i, amp, .14f * i, tilt));
synth.AddSampler(new VocalSampler(synth, Phoneme.GetPresetIPA("e")));
synth.CreateAudioStream();
ThreadPool.QueueUserWorkItem(PlaySynthFunc, synth);
}
public static void GenerateWavHeader(Synthesizer synth, Stream stream, int sampleCount, SampleFormat sampleFormat)
{
using (var headerStream = new MemoryStream(40))
using(var header = new BinaryWriter(headerStream, Encoding.Default, false))
{
header.Write(CHUNK_RIFF);
int posFileSize = (int)headerStream.Position;
header.Write(0); // Replace later
header.Write(ID_WAVE);
// "fmt " chunk
header.Write(CHUNK_FMT);
header.Write(FMT_CHUNK_SIZE);
header.Write(sampleFormat == SampleFormat.Float32 || sampleFormat == SampleFormat.Float64 ? WAV_FORMAT_IEEE_FLOAT : WAV_FORMAT_PCM);
header.Write(NUM_CHANNELS);
header.Write(synth.SampleRate);
// Data rate (bytes per second), block size, and bits per sample
int blockSize = 0;
switch (sampleFormat)
{
case SampleFormat.Float64:
header.Write(synth.SampleRate * sizeof(double) * NUM_CHANNELS);
header.Write((short)(blockSize = sizeof(double) * NUM_CHANNELS));
header.Write((short)(sizeof(double) * 8));
break;
case SampleFormat.Float32:
header.Write(synth.SampleRate * sizeof(float) * NUM_CHANNELS);
header.Write((short)(blockSize = sizeof(float) * NUM_CHANNELS));
header.Write((short)(sizeof(float) * 8));
break;
case SampleFormat.Signed16:
header.Write(synth.SampleRate * sizeof(short) * NUM_CHANNELS);
header.Write((short)(blockSize = sizeof(short) * NUM_CHANNELS));
header.Write((short)(sizeof(short) * 8));
break;
case SampleFormat.Unsigned8:
header.Write(synth.SampleRate * sizeof(byte) * NUM_CHANNELS);
header.Write((short)(blockSize = sizeof(byte) * NUM_CHANNELS));
header.Write((short)(sizeof(byte) * 8));
break;
}
header.Write(EXT_SIZE); // cbSize, required for non-PCM formats
// "fact" chunk (required for non-PCM formats)
if (sampleFormat == SampleFormat.Float32 || sampleFormat == SampleFormat.Float64)
{
header.Write(CHUNK_FACT);
header.Write(FACT_CHUNK_SIZE);
header.Write(sampleCount);
}
// "data" chunk
header.Write(CHUNK_DATA);
int dataSize = blockSize * sampleCount;
header.Write(dataSize);
int dataPos = (int)headerStream.Position;
headerStream.Position = posFileSize;
header.Write((int)headerStream.Length + dataSize);
// Copy the data over to the audio stream
headerStream.Flush();
headerStream.WriteTo(stream);
stream.Position = dataPos;
}
}
