private void PullAudioFrameThread()
{
var avsync_type = 0;
var bytesPerSample = 2;
var type = AUDIO_FRAME_TYPE.FRAME_TYPE_PCM16;
var channels = CHANNEL;
var samples = SAMPLE_RATE / PULL_FREQ_PER_SEC * CHANNEL;
var samplesPerSec = SAMPLE_RATE;
var buffer = Marshal.AllocHGlobal(samples * bytesPerSample);
var freq = 1000 / PULL_FREQ_PER_SEC;
var tic = new TimeSpan(DateTime.Now.Ticks);
while (_pullAudioFrameThreadSignal)
{
var toc = new TimeSpan(DateTime.Now.Ticks);
if (toc.Subtract(tic).Duration().Milliseconds >= freq)
{
tic = new TimeSpan(DateTime.Now.Ticks);
_audioRawDataManager.PullAudioFrame(buffer, (int)type, samples, bytesPerSample, channels,
samplesPerSec, 0, avsync_type);
var byteArray = new byte[samples * bytesPerSample];
Marshal.Copy(buffer, byteArray, 0, samples * bytesPerSample);
var floatArray = ConvertByteToFloat16(byteArray);
lock (audioBuffer)
{
audioBuffer.Put(floatArray);
}
writeCount += floatArray.Length;
count += 1;
}
if (count == 100)
{
_startSignal = true;
}
}
Marshal.FreeHGlobal(buffer);
}
unsafe void PullAudioFrameThread()
{
int sampleRate = _sampleRate;
int channels = _channelCount;
var frameType = AUDIO_FRAME_TYPE.FRAME_TYPE_PCM16;
var bytesPerSample = 2; // PCM16
var samplesPerChannel = (int)(sampleRate * _frameDurationMs / 1000.0f);
var frameBufferPointer = Marshal.AllocHGlobal(samplesPerChannel * channels * bytesPerSample);
var pcmBuffer = new float[samplesPerChannel * channels];
_ringBuffer = new RingBuffer <float>(samplesPerChannel * channels * 4); // 4[frames]
var tic = new TimeSpan(DateTime.Now.Ticks);
while (_pullAudioFrame)
{
var toc = new TimeSpan(DateTime.Now.Ticks);
if (toc.Subtract(tic).Duration().Milliseconds >= _frameDurationMs)
{
tic = new TimeSpan(DateTime.Now.Ticks);
_audioRawDataManager.PullAudioFrame(frameBufferPointer, (int)frameType, samplesPerChannel, bytesPerSample, channels, sampleRate, 0, 0);
var span = new ReadOnlySpan <Byte>((void *)frameBufferPointer, samplesPerChannel * channels * bytesPerSample);
// Convert 16bit PCM data bytes to 32bit float PCM data.
for (var i = 0; i < pcmBuffer.Length; i++)
{
pcmBuffer[i] = ConvertBytesToInt16(span.Slice(2 * i)) / 32768f; // The maximum absolute value of Int16 is 32768.
}
lock (_ringBuffer)
{
_ringBuffer.Enqueue(pcmBuffer);
}
}
}
Marshal.FreeHGlobal(frameBufferPointer);
}