static void read_callback(SoundIOInStream instream, int frame_count_min, int frame_count_max)
{
var write_ptr = ring_buffer.WritePointer;
int free_bytes = ring_buffer.FreeCount;
int free_count = free_bytes / instream.BytesPerFrame;
if (frame_count_min > free_count)
{
throw new InvalidOperationException("ring buffer overflow"); // panic()
}
int write_frames = Math.Min(free_count, frame_count_max);
int frames_left = write_frames;
for (; ;)
{
int frame_count = frames_left;
var areas = instream.BeginRead(ref frame_count);
if (frame_count == 0)
{
break;
}
if (areas.IsEmpty)
{
// Due to an overflow there is a hole. Fill the ring buffer with
// silence for the size of the hole.
for (int i = 0; i < frame_count * instream.BytesPerFrame; i++)
{
Marshal.WriteByte(write_ptr + i, 0);
}
Console.Error.WriteLine("Dropped {0} frames due to internal overflow", frame_count);
}
else
{
for (int frame = 0; frame < frame_count; frame += 1)
{
int chCount = instream.Layout.ChannelCount;
int copySize = instream.BytesPerSample;
unsafe {
for (int ch = 0; ch < chCount; ch += 1)
{
var area = areas.GetArea(ch);
Buffer.MemoryCopy((void *)area.Pointer, (void *)write_ptr, copySize, copySize);
area.Pointer += area.Step;
write_ptr += copySize;
}
}
}
}
instream.EndRead();
frames_left -= frame_count;
if (frames_left <= 0)
{
break;
}
}
int advance_bytes = write_frames * instream.BytesPerFrame;
ring_buffer.AdvanceWritePointer(advance_bytes);
}
static void ReadCallback(SoundIOInStream instream, int frameCountMin, int frameCountMax)
{
SoundIORingBuffer ringBuffer = ringBuffers[instream.UserData];
SoundIOChannelAreas areas;
SoundIoError err;
IntPtr writePtr = ringBuffer.WritePointer;
int freeBytes = ringBuffer.FreeCount;
int freeCount = freeBytes / instream.BytesPerFrame;
if (frameCountMin > freeCount)
{
throw new SoundIOException("Ring buffer overflow");
}
int writeFrames = Math.Min(freeCount, frameCountMax);
int framesLeft = writeFrames;
while (true)
{
int frameCount = framesLeft;
err = instream.BeginRead(out areas, ref frameCount);
if (err != SoundIoError.None)
{
throw new SoundIOException(string.Format("Begin read error: {0}.", err.GetErrorMessage()));
}
if (frameCount == 0)
{
break;
}
if (areas == null)
{
// Due to an overflow there is a hole. Fill the ring buffer with
// silence for the size of the hole.
int count = frameCount * instream.BytesPerFrame;
for (int i = 0; i < count; i++)
{
Marshal.WriteByte(writePtr + i, 0);
}
}
else
{
int channelCount = instream.Layout.ChannelCount;
int bytesPerSample = instream.BytesPerSample;
for (int frame = 0; frame < frameCount; frame++)
{
for (int ch = 0; ch < channelCount; ch++)
{
unsafe
{
Buffer.MemoryCopy((void *)areas[ch].Pointer, (void *)writePtr, bytesPerSample, bytesPerSample);
}
areas[ch].AdvancePointer();
writePtr += bytesPerSample;
}
}
}
err = instream.EndRead();
if (err != SoundIoError.None)
{
throw new SoundIOException(string.Format("End read error: {0}.", err.GetErrorMessage()));
}
framesLeft -= frameCount;
if (framesLeft <= 0)
{
break;
}
}
int advanceBytes = writeFrames * instream.BytesPerFrame;
ringBuffer.AdvanceWritePointer(advanceBytes);
}
public static int Main(string [] args)
{
string in_device_id = null, out_device_id = null;
string backend_name = null;
bool in_raw = false, out_raw = false;
double microphone_latency = 0.2; // seconds
foreach (var arg in args)
{
switch (arg)
{
case "--in_raw":
in_raw = true;
continue;
case "--out_raw":
out_raw = true;
continue;
default:
if (arg.StartsWith("--backend:"))
{
backend_name = arg.Substring(arg.IndexOf(':') + 1);
}
else if (arg.StartsWith("--in-device:"))
{
in_device_id = arg.Substring(arg.IndexOf(':') + 1);
}
else if (arg.StartsWith("--out-device:"))
{
out_device_id = arg.Substring(arg.IndexOf(':') + 1);
}
else if (arg.StartsWith("--latency:"))
{
microphone_latency = double.Parse(arg.Substring(arg.IndexOf(':') + 1));
}
continue;
}
}
var api = new SoundIO();
var backend = backend_name == null ? SoundIOBackend.None : (SoundIOBackend)Enum.Parse(typeof(SoundIOBackend), backend_name);
if (backend == SoundIOBackend.None)
{
api.Connect();
}
else
{
api.ConnectBackend(backend);
}
Console.WriteLine("backend: " + api.CurrentBackend);
api.FlushEvents();
var in_device = in_device_id == null?api.GetInputDevice(api.DefaultInputDeviceIndex) :
Enumerable.Range(0, api.InputDeviceCount)
.Select(i => api.GetInputDevice(i))
.FirstOrDefault(d => d.Id == in_device_id && d.IsRaw == in_raw);
if (in_device == null)
{
Console.Error.WriteLine("Input device " + in_device_id + " not found.");
return(1);
}
Console.WriteLine("input device: " + in_device.Name);
if (in_device.ProbeError != 0)
{
Console.Error.WriteLine("Cannot probe input device " + in_device_id + ".");
return(1);
}
var out_device = out_device_id == null?api.GetOutputDevice(api.DefaultOutputDeviceIndex) :
Enumerable.Range(0, api.OutputDeviceCount)
.Select(i => api.GetOutputDevice(i))
.FirstOrDefault(d => d.Id == out_device_id && d.IsRaw == out_raw);
if (out_device == null)
{
Console.Error.WriteLine("Output device " + out_device_id + " not found.");
return(1);
}
Console.WriteLine("output device: " + out_device.Name);
if (out_device.ProbeError != 0)
{
Console.Error.WriteLine("Cannot probe output device " + out_device_id + ".");
return(1);
}
out_device.SortDeviceChannelLayouts();
var layout = SoundIODevice.BestMatchingChannelLayout(out_device, in_device);
if (layout.IsNull)
{
throw new InvalidOperationException("channel layouts not compatible"); // panic()
}
var sample_rate = prioritized_sample_rates.FirstOrDefault(sr => in_device.SupportsSampleRate(sr) && out_device.SupportsSampleRate(sr));
if (sample_rate == default(int))
{
throw new InvalidOperationException("incompatible sample rates"); // panic()
}
var fmt = prioritized_formats.FirstOrDefault(f => in_device.SupportsFormat(f) && out_device.SupportsFormat(f));
if (fmt == default(SoundIOFormat))
{
throw new InvalidOperationException("incompatible sample formats"); // panic()
}
var instream = in_device.CreateInStream();
instream.Format = fmt;
instream.SampleRate = sample_rate;
instream.Layout = layout;
instream.SoftwareLatency = microphone_latency;
instream.ReadCallback = (fmin, fmax) => read_callback(instream, fmin, fmax);
instream.Open();
var outstream = out_device.CreateOutStream();
outstream.Format = fmt;
outstream.SampleRate = sample_rate;
outstream.Layout = layout;
outstream.SoftwareLatency = microphone_latency;
outstream.WriteCallback = (fmin, fmax) => write_callback(outstream, fmin, fmax);
outstream.UnderflowCallback = () => underflow_callback(outstream);
outstream.Open();
int capacity = (int)(microphone_latency * 2 * instream.SampleRate * instream.BytesPerFrame);
ring_buffer = api.CreateRingBuffer(capacity);
var buf = ring_buffer.WritePointer;
int fill_count = (int)(microphone_latency * outstream.SampleRate * outstream.BytesPerFrame);
// FIXME: there should be more efficient way for memset()
for (int i = 0; i < fill_count; i++)
{
Marshal.WriteByte(buf, i, 0);
}
ring_buffer.AdvanceWritePointer(fill_count);
instream.Start();
outstream.Start();
for (;;)
{
api.WaitEvents();
}
outstream.Dispose();
instream.Dispose();
in_device.RemoveReference();
out_device.RemoveReference();
api.Dispose();
return(0);
}