Default output stream working

.gitignore

@@ -4,3 +4,4 @@ __pycache__
 python/lasprs/_lasprs*
 .venv
 .vscode/launch.json
+.vscode

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "lasprs"
-version = "0.2.2"
+version = "0.3.0"
 edition = "2021"
 authors = ["J.A. de Jong <j.a.dejong@ascee.nl>"]
 description = "Library for Acoustic Signal Processing (Rust edition, with optional Python bindings via pyo3)"
@@ -37,7 +37,7 @@ rand = "0.8.5"
 rand_distr = "0.4.3"
 
 # Cross-platform audio lib
-cpal = { version = "0.15.2", optional = true }
+cpal = { version = "0.15.3", optional = true }
 
 # Nice enumerations
 strum = "0.25.0"

src/bin/lasp_devinfo.rs

@@ -6,7 +6,8 @@ use lasprs::daq::{DaqConfig, StreamMgr};
 #[derive(Parser, Debug)]
 #[command(author, version, about="Generates DAQ configurations for available devices.", long_about = None)]
 struct Args {
-    /// Name of the person to greet
+    /// Devices to match. Search for these substrings in device names. Only
+    /// configurations are output based on these names.
     #[arg(short, long)]
     matches: Vec<String>,
 }
@@ -16,18 +17,26 @@ fn main() -> Result<()> {
     let write_all = args.matches.len() == 0;
     let mut smgr = StreamMgr::new();
 
+    // Obtain list of devices
     let devs = smgr.getDeviceInfo();
+
+    // Iterate over them
     for dev in devs.iter() {
+        // The file name will be the device name, plus toml extension
         let filename = dev.device_name.clone() + ".toml";
+
+        // If no device name strings are given, we are outputting them all to a file.
         if write_all {
             let daqconfig = DaqConfig::newFromDeviceInfo(&dev);
             daqconfig.serialize_TOML_file(&filename.clone().into())?;
         } else {
+            // See if we find the name in the match list.
             for m in args.matches.iter() {
                 let needle = m.to_lowercase();
                 let dev_lower = (&dev.device_name).to_lowercase();
                 if dev_lower.contains(&needle) {
-                    DaqConfig::newFromDeviceInfo(&dev).serialize_TOML_file(&filename.clone().into())?;
+                    DaqConfig::newFromDeviceInfo(&dev)
+                        .serialize_TOML_file(&filename.clone().into())?;
                 }
             }
         }

src/bin/lasp_outputdefault.rs

@@ -0,0 +1,66 @@
+use anyhow::Result;
+use crossbeam::channel::{unbounded, Receiver, TryRecvError};
+use lasprs::daq::{InStreamMsg, StreamHandler, StreamMgr, StreamStatus, StreamType};
+use lasprs::siggen::Siggen;
+use std::io;
+use std::{thread, time};
+// use
+
+fn spawn_stdin_channel() -> Receiver<String> {
+    let (tx, rx) = unbounded();
+    thread::spawn(move || 'tt: loop {
+        let mut buffer = String::new();
+        io::stdin().read_line(&mut buffer).unwrap();
+        if let Err(_) = tx.send(buffer) {
+            break 'tt;
+        }
+    });
+    rx
+}
+fn sleep(millis: u64) {
+    let duration = time::Duration::from_millis(millis);
+    thread::sleep(duration);
+}
+fn main() -> Result<()> {
+    let mut smgr = StreamMgr::new();
+
+    println!("Starting stream...");
+    smgr.startDefaultOutputStream()?;
+    let stdin_channel = spawn_stdin_channel();
+
+    println!("Creating signal generator...");
+    let mut siggen = Siggen::newSineWave(2, 100.);
+    siggen.setDCOffset(&[0.1, 0.]);
+    // let mut siggen = Siggen::newWhiteNoise(2);
+    siggen.setAllGains(0.1);
+    // siggen.setMute(&[true, true]);
+    // siggen.setMute(&[true, false]);
+    // siggen.setAllMute(false);
+    smgr.setSiggen(siggen)?;
+
+    'infy: loop {
+        match stdin_channel.try_recv() {
+            Ok(_key) => break 'infy,
+            Err(TryRecvError::Empty) => {}
+            Err(TryRecvError::Disconnected) => panic!("Channel disconnected"),
+        }
+        sleep(1000);
+        match smgr.getStatus(StreamType::Output) {
+            StreamStatus::NotRunning => {
+                println!("Stream is not running?");
+                break 'infy;
+            }
+            StreamStatus::Running => {
+                println!("Stream is running...");
+            }
+            StreamStatus::Error(e) => {
+                println!("Stream error: {}", e);
+                break 'infy;
+            }
+        }
+
+        // let stat = smgr.
+    }
+
+    Ok(())
+}

src/bin/lasp_record.rs

@@ -48,8 +48,10 @@ fn main() -> Result<()> {
         startDelay: Duration::from_secs(ops.start_delay_s as u64),
     };
     match ops.config_file_daq {
+        // No config file is given, start default input stream
         None => smgr.startDefaultInputStream()?,
         Some(filename) => {
+            // If config file is given, use that.
             let file = std::fs::read_to_string(filename)?;
             let cfg = DaqConfig::deserialize_TOML_str(&file)?;
             smgr.startStream(StreamType::Input, &cfg)?;
@@ -66,7 +68,9 @@ fn main() -> Result<()> {
                 println!("\nRecord error: {}", e);
                 break 'infy;
             }
-            RecordStatus::Waiting => { println!("Waiting in start delay...");},
+            RecordStatus::Waiting => {
+                println!("Waiting in start delay...");
+            }
             RecordStatus::Finished => {
                 println!("\nRecording finished.");
                 break 'infy;
@@ -82,7 +86,7 @@ fn main() -> Result<()> {
                 println!("User pressed key. Manually stopping recording here.");
                 match _key.to_lowercase().as_str() {
                     "c" => r.cancel(),
-                   _ => r.stop()
+                    _ => r.stop(),
                 }
                 break 'infy;
             }

src/daq/api/api_cpal.rs

@@ -1,44 +1,43 @@
 #![allow(dead_code)]
 use super::Stream;
 use crate::config::{self, *};
-use crate::daq::daqconfig::{DaqChannel, DaqConfig};
+use crate::daq::{self, *};
-use crate::daq::deviceinfo::DeviceInfo;
-use crate::daq::{self, streammsg::*, DataType};
-use crate::siggen::Siggen;
 use anyhow::{bail, Result};
 use cpal::traits::{DeviceTrait, HostTrait, StreamTrait};
 use cpal::{Device, Host, Sample, SampleFormat, SupportedBufferSize};
+use crossbeam::atomic::AtomicCell;
 use crossbeam::channel::{Receiver, Sender};
 use itertools::Itertools;
+use num::ToPrimitive;
+use reinterpret::reinterpret_slice;
+use std::any::{Any, TypeId};
 use std::collections::VecDeque;
+use std::fmt::Debug;
 use std::sync::Arc;
 
-/// Convert datatype in CPAL sampleformat
+/// Convert CPAL sampleformat datatype
 impl From<DataType> for cpal::SampleFormat {
     fn from(dt: DataType) -> cpal::SampleFormat {
-        let sf = match dt {
+        match dt {
             DataType::F64 => SampleFormat::F64,
             DataType::F32 => SampleFormat::F32,
             DataType::I8 => SampleFormat::I8,
             DataType::I16 => SampleFormat::I16,
             DataType::I32 => SampleFormat::I32,
-            DataType::I64 => SampleFormat::I64,
-        };
-        sf
         }
     }
+}
+// Convert datatype to CPAL sample format
 impl From<cpal::SampleFormat> for DataType {
     fn from(sf: cpal::SampleFormat) -> DataType {
-        let dt = match sf {
+        match sf {
             SampleFormat::F64 => DataType::F64,
             SampleFormat::F32 => DataType::F32,
             SampleFormat::I8 => DataType::I8,
             SampleFormat::I16 => DataType::I16,
             SampleFormat::I32 => DataType::I32,
-            SampleFormat::I64 => DataType::I64,
             _ => panic!("Not implemented sample format: {}", sf),
-        };
+        }
-        dt
     }
 }
 
@@ -48,22 +47,23 @@ pub struct CpalApi {
 }
 pub struct CpalStream {
     stream: cpal::Stream,
-    md: Option<StreamMetaData>,
+    md: Arc<StreamMetaData>,
     noutchannels: usize,
+    status: Arc<AtomicCell<StreamStatus>>,
 }
 impl Stream for CpalStream {
-    fn metadata(&self) -> Option<StreamMetaData> {
+    fn metadata(&self) -> Arc<StreamMetaData> {
         self.md.clone()
     }
     fn ninchannels(&self) -> usize {
-        if let Some(md) = &self.md {
+        self.md.nchannels()
-            return md.nchannels();
-        }
-        0
     }
     fn noutchannels(&self) -> usize {
         self.noutchannels
     }
+    fn status(&self) -> StreamStatus {
+        self.status.load()
+    }
 }
 
 impl CpalApi {
@@ -93,7 +93,7 @@ impl CpalApi {
             let mut iChannelCount = 0;
             let mut oChannelCount = 0;
 
-            let mut sample_rates = srs_tot.clone();
+            let mut avSampleRates = srs_tot.clone();
             let mut avFramesPerBlock = vec![256 as usize, 512, 1024, 2048, 8192];
 
             let mut sample_formats = vec![];
@@ -105,8 +105,8 @@ impl CpalApi {
                         continue;
                     }
                     sample_formats.push(icfg.sample_format());
-                    sample_rates.retain(|sr| *sr >= icfg.min_sample_rate().0 as Flt);
+                    avSampleRates.retain(|sr| *sr >= icfg.min_sample_rate().0 as Flt);
-                    sample_rates.retain(|sr| *sr <= icfg.max_sample_rate().0 as Flt);
+                    avSampleRates.retain(|sr| *sr <= icfg.max_sample_rate().0 as Flt);
                     if let SupportedBufferSize::Range { min, max } = icfg.buffer_size() {
                         avFramesPerBlock.retain(|i| i >= &(*min as usize));
                         avFramesPerBlock.retain(|i| i <= &(*max as usize));
@@ -122,8 +122,8 @@ impl CpalApi {
                         continue;
                     }
                     sample_formats.push(thissf);
-                    sample_rates.retain(|sr| *sr >= ocfg.min_sample_rate().0 as Flt);
+                    avSampleRates.retain(|sr| *sr >= ocfg.min_sample_rate().0 as Flt);
-                    sample_rates.retain(|sr| *sr <= ocfg.max_sample_rate().0 as Flt);
+                    avSampleRates.retain(|sr| *sr <= ocfg.max_sample_rate().0 as Flt);
                     if let SupportedBufferSize::Range { min, max } = ocfg.buffer_size() {
                         avFramesPerBlock.retain(|i| i >= &(*min as usize));
                         avFramesPerBlock.retain(|i| i <= &(*max as usize));
@@ -143,15 +143,15 @@ impl CpalApi {
                 Some(idx) => dtypes[idx],
                 None => dtypes[dtypes.len() - 1],
             };
-            let prefSampleRate = *sample_rates.last().unwrap_or(&48000.);
+            let prefSampleRate = *avSampleRates.last().unwrap_or(&48000.);
             devs.push(DeviceInfo {
                 api: super::StreamApiDescr::Cpal,
                 device_name: dev.name()?,
                 avDataTypes: dtypes,
                 prefDataType,
 
-                avSampleRates: sample_rates,
+                avSampleRates,
-                prefSampleRate: prefSampleRate,
+                prefSampleRate,
                 avFramesPerBlock,
                 prefFramesPerBlock: 2048,
 
@@ -163,7 +163,7 @@ impl CpalApi {
                 hasInputTrigger: false,
                 hasInternalOutputMonitor: false,
                 duplexModeForced: false,
-                physicalIOQty: daq::Qty::Number,
+                physicalIOQty: Qty::Number,
             })
         }
 
@@ -171,18 +171,71 @@ impl CpalApi {
     }
 
     // Create the error function closure, that capture the send channel on which error messages from the stream are sent
-    fn create_errfcn(send_ch: Sender<RawStreamData>) -> impl FnMut(cpal::StreamError) {
+    fn create_errfcn(
-        let errfn = move |err: cpal::StreamError| match err {
+        send_ch: Option<Sender<RawStreamData>>,
-            cpal::StreamError::DeviceNotAvailable => send_ch
+        status: Arc<AtomicCell<StreamStatus>>,
-                .send(RawStreamData::StreamError(StreamError::DeviceNotAvailable))
+    ) -> impl FnMut(cpal::StreamError) {
-                .unwrap(),
+        let errfn = move |err: cpal::StreamError| {
-            cpal::StreamError::BackendSpecific { err: _ } => send_ch
+            let serr = match err {
-                .send(RawStreamData::StreamError(StreamError::DriverError))
+                cpal::StreamError::DeviceNotAvailable => StreamError::DeviceNotAvailable,
-                .unwrap(),
+                cpal::StreamError::BackendSpecific { err: _ } => StreamError::DriverError,
+            };
+            if let Some(sender) = &send_ch {
+                sender.send(RawStreamData::StreamError(serr)).unwrap();
+            }
+            status.store(StreamStatus::Error(serr));
         };
         errfn
     }
 
+    fn create_incallback<T>(
+        config: &cpal::StreamConfig,
+        sender: Sender<RawStreamData>,
+        framesPerBlock: usize,
+        en_inchannels: Vec<usize>,
+    ) -> impl FnMut(&[T], &cpal::InputCallbackInfo)
+    where
+        T: 'static + Sample + ToPrimitive,
+    {
+        let tot_inch = config.channels as usize;
+
+        let mut q = VecDeque::<T>::with_capacity(2 * tot_inch * framesPerBlock);
+
+        let mut enabled_ch_data: Vec<T> =
+            vec![Sample::EQUILIBRIUM; en_inchannels.len() * framesPerBlock];
+
+        // The actual callback that is returned
+        move |input: &[T], _: &cpal::InputCallbackInfo| {
+            // Copy elements over in ring buffer
+            q.extend(input);
+
+            while q.len() > tot_inch * framesPerBlock {
+                // println!("q full enough: {}", q.len());
+
+                //         // Loop over enabled channels
+                for (i, ch) in en_inchannels.iter().enumerate() {
+                    let in_iterator = q.iter().skip(*ch).step_by(tot_inch);
+                    let out_iterator = enabled_ch_data
+                        .iter_mut()
+                        .skip(i)
+                        .step_by(en_inchannels.len());
+
+                    // Copy over elements, *DEINTERLEAVED*
+                    out_iterator.zip(in_iterator).for_each(|(o, i)| {
+                        *o = *i;
+                    });
+                }
+
+                // Drain copied elements from ring buffer
+                q.drain(0..framesPerBlock * tot_inch);
+
+                // Send over data
+                let msg = RawStreamData::from(enabled_ch_data.clone());
+                sender.send(msg).unwrap()
+            }
+        }
+    }
+
     /// Create an input stream for a CPAL device.
     ///
     /// # Arguments
@@ -195,32 +248,21 @@ impl CpalApi {
         sender: Sender<RawStreamData>,
         en_inchannels: Vec<usize>,
         framesPerBlock: usize,
-    ) -> Result<cpal::Stream> {
+    ) -> Result<(cpal::Stream, Arc<AtomicCell<StreamStatus>>)> {
-        let tot_inch = config.channels as usize;
+        let status = Arc::new(AtomicCell::new(StreamStatus::NotRunning));
 
-        let sender_err = sender.clone();
+        let errfcn = CpalApi::create_errfcn(Some(sender.clone()), status.clone());
 
         macro_rules! build_stream{
-            ($($cpaltype:pat, $rtype:ty);*) => {
+            ($($cpaltype:pat => $rtype:ty),*) => {
                 match sf {
                     $(
                         $cpaltype => {
-                            let mut q = VecDeque::<$rtype>::with_capacity(2*tot_inch*framesPerBlock);
+                        let icb = CpalApi::create_incallback::<$rtype>(&config, sender, framesPerBlock, en_inchannels);
-
                             device.build_input_stream(
                             &config,
-                            move |data, _: &_| InStreamCallback::<$rtype>(
+                            icb,
-                                data, &sender,
+                            errfcn,
-                                // Total number of input channels. This API has to filter out
-                                // the channels that are not enabled
-                                tot_inch,
-                                // Vector of channels numbers that are enabled
-                                 &en_inchannels,
-                                // Frames per block
-                                framesPerBlock,
-                                // Ring buffer for storage of samples as required.
-                                &mut q),
-                            CpalApi::create_errfcn(sender_err),
                             None)?
                 }),*,
                         _ => bail!("Unsupported sample format '{}'", sf)
@@ -228,12 +270,106 @@ impl CpalApi {
             }
         }
         let stream: cpal::Stream = build_stream!(
-        SampleFormat::I8, i8;
+        SampleFormat::I8 => i8,
-        SampleFormat::I16, i16;
+        SampleFormat::I16 => i16,
-        SampleFormat::I32, i32;
+        SampleFormat::I32 => i32,
-        SampleFormat::F32, f32
+        SampleFormat::F32 => f32
         );
-        Ok(stream)
+        Ok((stream, status))
+    }
+
+    fn create_outcallback<T>(
+        config: &cpal::StreamConfig,
+        streamstatus: Arc<AtomicCell<StreamStatus>>,
+        receiver: Receiver<RawStreamData>,
+        framesPerBlock: usize,
+    ) -> impl FnMut(&mut [T], &cpal::OutputCallbackInfo)
+    where
+        T: 'static + Sample + Debug,
+    {
+        let tot_outch: usize = config.channels as usize;
+        // println!("Numer of channels: {:?}", tot_outch);
+        let mut callback_ctr: usize = 0;
+        let mut q = VecDeque::<T>::with_capacity(2 * tot_outch * framesPerBlock);
+
+        move |data, _info: &_| {
+            let nsamples_asked = data.len();
+            let status = streamstatus.load();
+            callback_ctr += 1;
+
+            let mut setToEquilibrium = || data.iter_mut().for_each(|v| *v = Sample::EQUILIBRIUM);
+            match status {
+                StreamStatus::NotRunning | StreamStatus::Error(_) => {
+                    setToEquilibrium();
+                    return;
+                }
+                _ => {}
+            }
+
+            if q.len() < nsamples_asked {
+                // Obtain new samples from the generator
+                for dat in receiver.try_iter() {
+                    let slice = dat.getRef::<T>();
+                    if let StreamStatus::Running = status {
+                        q.extend(slice);
+                    }
+                }
+            }
+
+            if q.len() >= nsamples_asked {
+                // All right, we have enough samples to send out! They are
+                // drained from the queue
+                data.iter_mut()
+                    .zip(q.drain(..nsamples_asked))
+                    .for_each(|(o, i)| *o = i);
+            } else if callback_ctr <= 2 {
+                // For the first two blocks, we allow dat the data is not yet
+                // ready, without complaining on underruns
+                setToEquilibrium();
+            } else {
+                // Output buffer underrun
+                streamstatus.store(StreamStatus::Error(StreamError::OutputUnderrunError));
+                setToEquilibrium();
+            }
+        }
+    }
+
+    fn build_output_stream(
+        sf: cpal::SampleFormat,
+        config: &cpal::StreamConfig,
+        device: &cpal::Device,
+        receiver: Receiver<RawStreamData>,
+        framesPerBlock: usize,
+    ) -> Result<(cpal::Stream, Arc<AtomicCell<StreamStatus>>)> {
+        // let tot_ch = config.channels as usize;
+
+        let status = Arc::new(AtomicCell::new(StreamStatus::NotRunning));
+
+        let err_cb = CpalApi::create_errfcn(None, status.clone());
+        macro_rules! build_stream{
+            ($($cpaltype:pat => $rtype:ty),*) => {
+                match sf {
+                    $(
+                        $cpaltype => {
+        let outcallback = CpalApi::create_outcallback::<$rtype>(config, status.clone(), receiver, framesPerBlock);
+                            device.build_output_stream(
+                            &config,
+                            outcallback,
+                            err_cb,
+                            None)?
+                }),*,
+                        _ => bail!("Unsupported sample format '{}'", sf)
+                }
+            }
+        }
+        let stream: cpal::Stream = build_stream!(
+        SampleFormat::I8 => i8,
+        SampleFormat::I16 => i16,
+        SampleFormat::I32 => i32,
+        SampleFormat::F32 => f32
+        );
+
+        Ok((stream, status))
     }
 
     /// Create CPAL specific configuration, from our specified daq config and device info
@@ -285,7 +421,7 @@ impl CpalApi {
     }
 
     /// Start a stream for a device with a given configuration.
-    pub fn startStream(
+    pub fn startInputStream(
         &self,
         stype: StreamType,
         devinfo: &DeviceInfo,
@@ -316,16 +452,15 @@ impl CpalApi {
             let sf = supported_config.sample_format();
             let config: cpal::StreamConfig = supported_config.config();
 
-            let (stream, metadata) = match stype {
-                StreamType::Input => {
             let meta = StreamMetaData::new(
                 &conf.enabledInchannelConfig(),
                 conf.dtype,
                 supported_config.sample_rate().0 as Flt,
                 framesPerBlock,
             )?;
+            let meta = Arc::new(meta);
 
-                    let stream = CpalApi::build_input_stream(
+            let (stream, status) = CpalApi::build_input_stream(
                 sf,
                 &config,
                 &cpaldev,
@@ -333,20 +468,15 @@ impl CpalApi {
                 conf.enabledInchannelsList(),
                 framesPerBlock,
             )?;
-                    (stream, Some(meta))
-                }
-
-                StreamType::Output => bail!("Not implemented output stream"),
-                _ => unreachable!(""),
-            };
 
             stream.play()?;
+            status.store(StreamStatus::Running);
 
-            let noutchannels = conf.numberEnabledOutChannels();
             return Ok(Box::new(CpalStream {
                 stream,
-                md: metadata,
+                md: meta,
-                noutchannels,
+                noutchannels: 0,
+                status,
             }));
         }
         bail!(format!(
@@ -373,7 +503,7 @@ impl CpalApi {
                 let en_inchannels = Vec::from_iter((0..config.channels()).map(|i| i as usize));
 
                 let sf = config.sample_format();
-                let stream = CpalApi::build_input_stream(
+                let (stream, status) = CpalApi::build_input_stream(
                     sf,
                     &final_config,
                     &device,
@@ -382,11 +512,13 @@ impl CpalApi {
                     framesPerBlock,
                 )?;
                 stream.play()?;
+                status.store(StreamStatus::Running);
 
                 // Daq: default channel config
-                let daqchannels = Vec::from_iter((0..final_config.channels).map(|i| {
+                let daqchannels = Vec::from_iter(
-                    DaqChannel::defaultAudioInput(format!("Unnamed input channel {}", i))
+                    (0..final_config.channels)
-                }));
+                        .map(|i| DaqChannel::defaultAudio(format!("Unnamed input channel {}", i))),
+                );
 
                 // Specify data tape
                 let dtype = DataType::from(sf);
@@ -398,10 +530,12 @@ impl CpalApi {
                     config.sample_rate().0 as Flt,
                     framesPerBlock,
                 )?;
+                let md = Arc::new(md);
                 Ok(Box::new(CpalStream {
                     stream,
-                    md: Some(md),
+                    md,
                     noutchannels: 0,
+                    status,
                 }))
             } else {
                 bail!("Could not obtain default input configuration")
@@ -410,72 +544,71 @@ impl CpalApi {
             bail!("Could not open default input device")
         }
     }
-    // Create an output stream, using given signal generators for each channel.
-    // fn build_output_stream(
-    //     sf: cpal::SampleFormat,
-    //     config: cpal::StreamConfig,
-    //     device: &cpal::Device,
-    //     siggens: Vec<Siggen>,
-    // ) -> Result<cpal::Stream> {
-    //     macro_rules! build_stream{
-    //         ($($cpaltype:pat, $rtype:ty);*) => {
-    //             match sf {
-    //                 $(
-    //                     $cpaltype => device.build_input_stream(
-    //                         &config,
-    //                         move |data, _: &_| InStreamCallback::<$rtype>(data, &sender),
-    //                         CpalApi::create_errfcn(sender.clone()),
-    //                         None)?
-    //                     ),*,
-    //                     _ => bail!("Unsupported sample format '{}'", sf)
-    //             }
-    //         }
-    //     }
-    //     let stream: cpal::Stream = build_stream!(
-    //     SampleFormat::I8, i8;
-    //     SampleFormat::I16, i16;
-    //     SampleFormat::I32, i32;
-    //     SampleFormat::F32, f32
-    //     );
-    //     Ok(stream)
-    // }
-}
 
-fn InStreamCallback<T>(
+    pub fn startDefaultOutputStream(
-    input: &[T],
+        &self,
-    sender: &Sender<RawStreamData>,
+        receiver: Receiver<RawStreamData>,
-    tot_inch: usize,
+    ) -> Result<Box<dyn Stream>> {
-    en_inchannels: &[usize],
+        if let Some(device) = self.host.default_output_device() {
-    framesPerBlock: usize,
+            if let Ok(config) = device.default_output_config() {
-    q: &mut VecDeque<T>,
+                // let framesPerBlock: usize = 256;
-) where
+                // let framesPerBlock: usize = 8192;
-    T: Copy + num::ToPrimitive + 'static,
+                let framesPerBlock: usize = config.sample_rate().0 as usize;
-{
+                // let framesPerBlock: usize = 256;
-    // Copy elements over in ring buffer
+                let final_config = cpal::StreamConfig {
-    q.extend(input);
+                    channels: config.channels(),
-    while q.len() > tot_inch * framesPerBlock {
+                    sample_rate: config.sample_rate(),
-        // println!("q full enough: {}", q.len());
+                    buffer_size: cpal::BufferSize::Fixed(framesPerBlock as u32),
-        let mut enabled_ch_data: Vec<T> = Vec::with_capacity(en_inchannels.len() * framesPerBlock);
+                };
-        unsafe {
+                // let en_outchannels = Vec::from_iter((0..config.channels()).map(|i| i as usize));
-            enabled_ch_data.set_len(enabled_ch_data.capacity());
-        }
 
-        // Loop over enabled channels
+                let sampleformat = config.sample_format();
-        for (i, ch) in en_inchannels.iter().enumerate() {
+                let (stream, status) = CpalApi::build_output_stream(
-            let in_iterator = q.iter().skip(*ch).step_by(tot_inch);
+                    sampleformat,
-            let out_iterator = enabled_ch_data.iter_mut().skip(i).step_by(en_inchannels.len());
+                    &final_config,
+                    &device,
+                    receiver,
+                    framesPerBlock,
+                )?;
 
-            // Copy over elements, *DEINTERLEAVED*
+                stream.play()?;
-            out_iterator.zip(in_iterator).for_each(|(o, i)| {
+                status.store(StreamStatus::Running);
-                *o = *i;
+
+                // Daq: default channel config
+                let daqchannels =
+                    Vec::from_iter((0..final_config.channels).map(|i| {
+                        DaqChannel::defaultAudio(format!("Unnamed output channel {}", i))
+                    }));
+
+                // // Specify data tape
+                let dtype = DataType::from(sampleformat);
+
+                // // Create stream metadata
+                let md = StreamMetaData::new(
+                    &daqchannels,
+                    dtype,
+                    config.sample_rate().0 as Flt,
+                    framesPerBlock,
+                )?;
+                let md = Arc::new(md);
+                let str = Box::new(CpalStream {
+                    stream,
+                    md,
+                    noutchannels: daqchannels.len(),
+                    status,
                 });
+                Ok(str)
+            } else {
+                bail!("Could not obtain default output configuration")
+            } // Default output config is OK
+        } else {
+            bail!("Could not open output device")
+        } // Could not
     }
+    // Create an output stream, using given signal generators for each channel.
+    // }
 
-        // Drain copied elements from ring buffer
+    pub fn startOutputStream(&self, rx: Receiver<RawStreamData>) -> Result<Box<dyn Stream>> {
-        q.drain(0..framesPerBlock * tot_inch);
+        bail!("Not implemented");
-
-        // Send over data
-        let msg = RawStreamData::from(enabled_ch_data);
-        sender.send(msg).unwrap()
     }
 }

src/daq/api/mod.rs

@@ -5,24 +5,28 @@ use serde::{Deserialize, Serialize};
 /// - ...
 use strum::EnumMessage;
 use strum_macros;
+use  std::sync::Arc;
 
-use super::StreamMetaData;
+use super::{streamstatus::StreamStatus, StreamMetaData};
 
 #[cfg(feature = "cpal-api")]
 pub mod api_cpal;
 
 #[cfg(feature = "pulse_api")]
 pub mod api_pulse;
+
 /// A currently running stream
 pub trait Stream {
     /// Stream metadata. Only available for input streams
-    fn metadata(&self) -> Option<StreamMetaData>;
+    fn metadata(&self) -> Arc<StreamMetaData>;
 
     /// Number of input channels in stream
     fn ninchannels(&self) -> usize;
 
     /// Number of output channels in stream
     fn noutchannels(&self) -> usize;
+
+    fn status(&self) -> StreamStatus;
 }
 
 #[derive(strum_macros::EnumMessage, Debug, Clone, PartialEq, Serialize, Deserialize)]

src/daq/daqconfig.rs

@@ -1,11 +1,11 @@
 use std::{ops::Index, path::PathBuf};
 
-use anyhow::Result;
 use super::api::StreamApiDescr;
 use super::datatype::DataType;
 use super::deviceinfo::DeviceInfo;
 use super::qty::Qty;
 use crate::config::*;
+use anyhow::Result;
 use serde::{Deserialize, Serialize};
 
 /// DAQ Configuration for a single channel
@@ -41,10 +41,10 @@ impl Default for DaqChannel {
 }
 impl DaqChannel {
     /// Default channel configuration for audio input from a certain channel
-    pub fn defaultAudioInput(name: String) -> Self {
+    pub fn defaultAudio(name: String) -> Self {
         DaqChannel {
             enabled: true,
-            name: name,
+            name,
             sensitivity: 1.0,
             IEPEEnabled: false,
             ACCouplingMode: false,
@@ -59,21 +59,27 @@ impl DaqChannel {
 pub struct DaqConfig {
     /// The API
     pub api: StreamApiDescr,
+
     /// Device name. Should match when starting a stream
     pub device_name: String,
 
     /// Configuration of the input channels
     pub inchannel_config: Vec<DaqChannel>,
+    
     /// Configuration of the output channels
     pub outchannel_config: Vec<DaqChannel>,
     /// The data type to use
     pub dtype: DataType,
+
     /// Whether to apply a digital high pass on the input. <= 0 means disabled. > 0 means, the value specifies the cut-on frequency for the first order high pass filter.
     pub digitalHighPassCutOn: Flt,
+
     /// The index to use in the list of possible sample rates
     sampleRateIndex: usize,
+
     /// The index to use in the list of possible frames per block
     framesPerBlockIndex: usize,
+
     /// Used when output channels should be monitored, i.e. reverse-looped back as input channels.
     monitorOutput: bool,
 }
@@ -82,7 +88,6 @@ impl DaqConfig {
     /// Creates a new default device configuration for a given device as specified with
     /// the DeviceInfo descriptor.
     pub fn newFromDeviceInfo(devinfo: &DeviceInfo) -> DaqConfig {
-
         let inchannel_config = (0..devinfo.iChannelCount)
             .map(|_| DaqChannel::default())
             .collect();
@@ -122,7 +127,6 @@ impl DaqConfig {
     /// * writer: Output writer, can be file or string, or anything that *is* std::io::Write
     ///
     pub fn serialize_TOML(&self, writer: &mut dyn std::io::Write) -> Result<()> {
-
         let ser_str = toml::to_string(&self)?;
         writer.write_all(ser_str.as_bytes())?;
 
@@ -134,14 +138,16 @@ impl DaqConfig {
     /// # Args
     ///
     /// * reader: implements the Read trait, from which we read the data.
-    pub fn deserialize_TOML<T>(reader: &mut T) -> Result<DaqConfig> where T: std::io::Read {
+    pub fn deserialize_TOML<T>(reader: &mut T) -> Result<DaqConfig>
+    where
+        T: std::io::Read,
+    {
         let mut read_str = vec![];
         reader.read_to_end(&mut read_str)?;
         let read_str = String::from_utf8(read_str)?;
         DaqConfig::deserialize_TOML_str(&read_str)
     }
 
-
     /// Deserialize from TOML string
     ///
     /// # Args
@@ -159,7 +165,6 @@ impl DaqConfig {
     /// * file: Name of file to write to
     ///
     pub fn serialize_TOML_file(&self, file: &PathBuf) -> Result<()> {
-
         let mut file = std::fs::File::create(file)?;
         self.serialize_TOML(&mut file)?;
         Ok(())

src/daq/datatype.rs

@@ -23,7 +23,4 @@ pub enum DataType {
     /// 32-bit integers
     #[strum(message = "I32", detailed_message = "32-bits integers")]
     I32 = 4,
-    /// 64-bit integers
-    #[strum(message = "I64", detailed_message = "64-bits integers")]
-    I64 = 5,
 }

src/daq/deviceinfo.rs

@@ -1,15 +1,15 @@
 //! Data acquisition model. Provides abstract layers around DAQ devices.
 #![allow(non_snake_case)]
 
-use super::*;
 use super::api::StreamApiDescr;
+use super::*;
+use  crate::config::*;
 
 /// Device info structure. Gives all information regarding a device, i.e. the number of input and
 /// output channels, its name and available sample rates and types.
 #[derive(Clone, Debug)]
 #[allow(dead_code)]
 pub struct DeviceInfo {
-
     /// The api in use for this device
     pub api: StreamApiDescr,
 
@@ -18,21 +18,25 @@ pub struct DeviceInfo {
 
     /// Available data types for the sample
     pub avDataTypes: Vec<DataType>,
+
     /// Preferred data type for device
     pub prefDataType: DataType,
 
     /// Available frames per block
     pub avFramesPerBlock: Vec<usize>,
+
     /// Preferred frames per block for device
     pub prefFramesPerBlock: usize,
 
     /// Available sample rates
     pub avSampleRates: Vec<Flt>,
+
     /// Preferred sample rate for device
     pub prefSampleRate: Flt,
 
     /// Number of input channels available for this device
     pub iChannelCount: u8,
+
     /// Number of output channels available for this device
     pub oChannelCount: u8,
 

src/daq/mod.rs

@@ -5,385 +5,79 @@ mod daqconfig;
 mod datatype;
 mod deviceinfo;
 mod qty;
+
 #[cfg(feature = "record")]
 mod record;
+
+mod streamcmd;
+mod streamdata;
 mod streamhandler;
+mod streammgr;
 mod streammsg;
+mod streamstatus;
 
 pub use daqconfig::*;
 pub use datatype::*;
 pub use deviceinfo::*;
 pub use qty::*;
+pub use streamcmd::*;
+pub use streamdata::*;
 pub use streamhandler::*;
+pub use streammgr::*;
 pub use streammsg::*;
+pub use streamstatus::*;
 
 #[cfg(feature = "record")]
 pub use record::*;
 
-#[cfg(feature = "cpal-api")]
+use strum_macros::Display;
-use api::api_cpal::CpalApi;
-
-use crate::{
-    config::*,
-    siggen::{self, Siggen},
-};
-use anyhow::{bail, Error, Result};
-use api::Stream;
-use core::time;
-use crossbeam::{
-    channel::{unbounded, Receiver, Sender, TrySendError},
-    thread,
-};
-use deviceinfo::DeviceInfo;
-use std::sync::{atomic::AtomicBool, Arc, Mutex};
-use std::thread::{JoinHandle, Thread};
-use streammsg::*;
-
-use self::api::StreamApiDescr;
 
 cfg_if::cfg_if! {
 if #[cfg(feature = "python-bindings")] {
     use pyo3::exceptions::PyValueError;
     use pyo3::prelude::*;
-    use pyo3::{pymodule, types::PyModule, PyResult};
+    use pyo3::{pymodule, pyclass, types::PyModule, PyResult};
 } else {} }
 
-/// Keep track of whether the stream has been created. To ensure singleton behaviour.
+/// Stream types that can be started
-static smgr_created: AtomicBool = AtomicBool::new(false);
-
-struct StreamData<T> {
-    streamtype: StreamType,
-    stream: Box<dyn Stream>,
-    threadhandle: JoinHandle<T>,
-    comm: Sender<StreamCommand>,
-}
-
-#[cfg_attr(feature = "python-bindings", pyclass(unsendable))]
-/// Configure and manage input / output streams.
 ///
-pub struct StreamMgr {
+#[cfg_attr(feature = "python-bindings", pyclass)]
-    // List of available devices
+#[derive(PartialEq, Clone, Copy)]
-    devs: Vec<DeviceInfo>,
+pub enum StreamType {
-
+    /// Input-only stream
-    // Input stream can be both input and duplex
+    Input,
-    input_stream: Option<StreamData<InQueues>>,
+    /// Output-only stream
-
+    Output,
-    // Output only stream
+    /// Input and output at the same time
-    output_stream: Option<StreamData<Siggen>>,
+    Duplex,
-
-    #[cfg(feature = "cpal-api")]
-    cpal_api: CpalApi,
-
-    /// The storage of queues. When no streams are running, they
-    /// are here. When stream is running, they will become available
-    /// in the JoinHandle of the thread.
-    instreamqueues: Option<InQueues>,
-
-    // Signal generator. Stored here on the bench in case no stream is running.
-    // It is picked when it is configured correctly for the starting output stream
-    // If it is not configured correctly, when a stream that outputs data is started
-    // ,it is removed here.
-    siggen: Option<crate::siggen::Siggen>,
 }
 
-#[cfg(feature = "python-bindings")]
+/// Errors that happen in a stream
-#[cfg_attr(feature = "python-bindings", pymethods)]
+#[derive(strum_macros::EnumMessage, Debug, Clone, Display, Copy)]
-impl StreamMgr {
+pub enum StreamError {
-    #[new]
+    /// Input overrun
-    /// See (StreamMgr::new())
+    #[strum(
-    fn new_py<'py>() -> StreamMgr {
+        message = "InputOverrun Error",
-        StreamMgr::new()
+        detailed_message = "Input buffer overrun"
-    }
+    )]
+    InputOverrunError,
     
-    // #[pyo3(name = "unit")]
+    /// Output underrun
-    // #[staticmethod]
+    #[strum(
-    // /// See: [Biquad::unit()]
+        message = "OutputUnderrunError",
-    // pub fn unit_py() -> Biquad {
+        detailed_message = "Output buffer underrun"
-    //     Biquad::unit()
+    )]
-    // }
+    OutputUnderrunError,
-    // #[pyo3(name = "firstOrderHighPass")]
-}
-impl StreamMgr {
-    /// Create new stream manager. A stream manager is supposed to be a singleton.
-    ///
-    /// # Panics
-    ///
-    /// When a StreamMgr object is already alive.
-    pub fn new() -> StreamMgr {
-        if smgr_created.load(std::sync::atomic::Ordering::Relaxed) {
-            panic!("BUG: Only one stream manager is supposed to be a singleton");
-        }
-        smgr_created.store(true, std::sync::atomic::Ordering::Relaxed);
 
-        let mut smgr = StreamMgr {
+    /// Driver specific error
-            devs: vec![],
+    #[strum(message = "DriverError", detailed_message = "Driver error")]
-            input_stream: None,
+    DriverError,
-            output_stream: None,
-            siggen: None,
 
-            #[cfg(feature = "cpal-api")]
+    /// Device
-            cpal_api: CpalApi::new(),
+    #[strum(detailed_message = "Device not available (anymore)")]
+    DeviceNotAvailable,
 
-            instreamqueues: Some(vec![]),
+    /// Logic error (something weird happened)
-        };
+    #[strum(detailed_message = "Logic error")]
-        smgr.devs = smgr.scanDeviceInfo();
+    LogicError,
-        smgr
-    }
-    /// Set a new signal generator. Returns an error if it is unapplicable.
-    /// It is unapplicable if the number of channels of output does not match the
-    /// number of output channels in a running stream.
-    pub fn setSiggen(&mut self, siggen: Siggen) -> Result<()> {
-        // Current signal generator. Where to place it?
-        if let Some(is) = &self.input_stream {
-            if let StreamType::Duplex = is.streamtype {
-                if siggen.nchannels() != is.stream.noutchannels() {
-                    bail!("Invalid number of channels configured in signal generator")
-                }
-                assert!(self.siggen.is_none());
-                is.comm.send(StreamCommand::NewSiggen(siggen)).unwrap();
-                return Ok(());
-            }
-        } else if let Some(os) = &self.output_stream {
-            assert!(self.siggen.is_none());
-            if siggen.nchannels() != os.stream.noutchannels() {
-                bail!("Invalid number of channels configured in signal generator")
-            }
-            os.comm.send(StreamCommand::NewSiggen(siggen)).unwrap();
-            return Ok(());
-        } else {
-            self.siggen = Some(siggen);
-            return Ok(());
-        }
-        unreachable!()
-    }
-
-    /// Obtain a list of devices that are available for each available API
-    pub fn getDeviceInfo(&mut self) -> &Vec<DeviceInfo> {
-        &self.devs
-    }
-
-    fn scanDeviceInfo(&self) -> Vec<DeviceInfo> {
-        let mut devinfo = vec![];
-        #[cfg(feature = "cpal-api")]
-        {
-            let cpal_devs = self.cpal_api.getDeviceInfo();
-            if let Ok(devs) = cpal_devs {
-                devinfo.extend(devs);
-            }
-        }
-        devinfo
-    }
-
-    /// Add a new queue to the lists of queues
-    pub fn addInQueue(&mut self, tx: Sender<InStreamMsg>) {
-        if let Some(is) = &self.input_stream {
-            is.comm.send(StreamCommand::AddInQueue(tx)).unwrap()
-        } else {
-            self.instreamqueues.as_mut().unwrap().push(tx);
-        }
-    }
-
-    fn startInputStreamThread(
-        &mut self,
-        stream: &Box<dyn Stream>,
-        rx: Receiver<RawStreamData>,
-    ) -> (JoinHandle<InQueues>, Sender<StreamCommand>) {
-        let (commtx, commrx) = unbounded();
-
-        // Unwrap here, as the queues should be free to grab
-        let mut iqueues = self.instreamqueues.take().unwrap();
-
-        let meta = stream.metadata().unwrap();
-
-        let threadhandle = std::thread::spawn(move || {
-            let mut ctr: usize = 0;
-            'infy: loop {
-                if let Ok(comm_msg) = commrx.try_recv() {
-                    match comm_msg {
-                        // New queue added
-                        StreamCommand::AddInQueue(queue) => {
-                            match queue.send(InStreamMsg::StreamStarted(Arc::new(meta.clone()))) {
-                                Ok(()) => iqueues.push(queue),
-                                Err(_) => {}
-                            }
-                        }
-
-                        // Remove queue from list
-                        StreamCommand::RemoveInQueue(queue) => {
-                            iqueues.retain(|q| !q.same_channel(&queue))
-                        }
-
-                        // Stop this thread. Returns the queue
-                        StreamCommand::StopThread => {
-                            sendMsgToAllQueues(&mut iqueues, InStreamMsg::StreamStopped);
-                            break 'infy;
-                        }
-                        StreamCommand::NewSiggen(_) => {
-                            panic!("Error: signal generator send to input-only stream.");
-                        }
-                    }
-                }
-                if let Ok(msg) = rx.recv_timeout(time::Duration::from_millis(10)) {
-                    // println!("Obtained raw stream data!");
-                    let msg = Arc::new(msg);
-                    let msg = InStreamMsg::RawStreamData(ctr, msg);
-                    sendMsgToAllQueues(&mut iqueues, msg);
-                    ctr += 1;
-                }
-            }
-            iqueues
-        });
-        (threadhandle, commtx)
-    }
-    fn match_devinfo(&self, cfg: &DaqConfig) -> Option<&DeviceInfo> {
-        for d in self.devs.iter() {
-            if d.device_name == cfg.device_name {
-                return Some(d);
-            }
-        }
-        None
-    }
-
-    /// Start a stream of certain type, using given configuration
-    pub fn startStream(&mut self, stype: StreamType, cfg: &DaqConfig) -> Result<()> {
-        if self.input_stream.is_some() {
-            bail!("Input stream is already running. Please first stop existing input stream.")
-        }
-        match stype {
-            StreamType::Input | StreamType::Duplex => {
-                if cfg.numberEnabledInChannels() == 0 {
-                    bail!("At least one input channel should be enabled for an input stream")
-                }
-            }
-            _ => {}
-        }
-
-        let (tx, rx): (Sender<RawStreamData>, Receiver<RawStreamData>) = unbounded();
-
-        let stream = match cfg.api {
-            StreamApiDescr::Cpal => {
-                let devinfo = self
-                    .match_devinfo(cfg)
-                    .ok_or(anyhow::anyhow!("Unable to find device {}", cfg.device_name))?;
-                self.cpal_api.startStream(stype, devinfo, cfg, tx)?
-            }
-            _ => bail!("Unimplemented api!"),
-        };
-
-        let iqueues = self.instreamqueues.as_mut().unwrap();
-        let meta = stream.metadata().unwrap();
-        sendMsgToAllQueues(iqueues, InStreamMsg::StreamStarted(Arc::new(meta)));
-
-        let (threadhandle, commtx) = self.startInputStreamThread(&stream, rx);
-
-        self.input_stream = Some(StreamData {
-            streamtype: stype,
-            stream,
-            threadhandle,
-            comm: commtx,
-        });
-
-        Ok(())
-    }
-
-    /// Start a default input stream, using default settings on everything. This is only possible
-    /// when the CPAL_api is available
-    pub fn startDefaultInputStream(&mut self) -> Result<()> {
-        if self.input_stream.is_some() {
-            bail!("Input stream is already running. Please first stop existing input stream.")
-        }
-
-        let (tx, rx): (Sender<RawStreamData>, Receiver<RawStreamData>) = unbounded();
-
-        // Only a default input stream when CPAL feature is enabled
-        cfg_if::cfg_if! {
-        if #[cfg(feature="cpal-api")] {
-        let stream = self.cpal_api.startDefaultInputStream(tx)?;
-                // Inform all listeners of new stream data
-
-        let iqueues = self.instreamqueues.as_mut().unwrap();
-        let meta = stream.metadata().unwrap();
-        sendMsgToAllQueues(iqueues, InStreamMsg::StreamStarted(Arc::new(meta)));
-
-        let (threadhandle, commtx) = self.startInputStreamThread(&stream, rx);
-
-        self.input_stream = Some(StreamData {
-            streamtype: StreamType::Input,
-            stream,
-            threadhandle,
-            comm: commtx,
-        });
-        Ok(())
-
-        }
-        else {
-        bail!("Unable to start default input stream: no CPAL api available")
-        }
-        }
-    }
-
-    /// Stop existing input stream.
-    pub fn stopInputStream(&mut self) -> Result<()> {
-        if let Some(StreamData {
-            streamtype: _, // Ignored here
-            stream: _,
-            threadhandle,
-            comm,
-        }) = self.input_stream.take()
-        {
-            // println!("Stopping existing stream..");
-            // Send thread to stop
-            comm.send(StreamCommand::StopThread).unwrap();
-
-            // Store stream queues back into StreamMgr
-            self.instreamqueues = Some(threadhandle.join().expect("Stream thread panicked!"));
-        } else {
-            bail!("Stream is not running.")
-        }
-        Ok(())
-    }
-    /// Stop existing running stream.
-    ///
-    /// Args
-    ///
-    /// * st: The stream type.
-    pub fn stopStream(&mut self, st: StreamType) -> Result<()> {
-        match st {
-            StreamType::Input | StreamType::Duplex => self.stopInputStream(),
-            _ => bail!("Not implemented output stream"),
-        }
-    }
-} // impl StreamMgr
-impl Drop for StreamMgr {
-    fn drop(&mut self) {
-        // Kill input stream if there is one
-        if self.input_stream.is_some() {
-            self.stopStream(StreamType::Input).unwrap();
-        }
-        if self.output_stream.is_some() {
-            self.stopStream(StreamType::Output).unwrap();
-        }
-
-        // Decref the singleton
-        smgr_created.store(false, std::sync::atomic::Ordering::Relaxed);
-    }
-}
-
-// Send to all queues, remove queues that are disconnected when found out
-// on the way.
-fn sendMsgToAllQueues(iqueues: &mut InQueues, msg: InStreamMsg) {
-    // Loop over queues. Remove queues that error when we try to send
-    // to them
-    iqueues.retain(|q| match q.try_send(msg.clone()) {
-        Ok(_) => true,
-        Err(_e) => false,
-    });
-}
-/// Daq devices
-trait Daq {}
-
-#[cfg(test)]
-mod tests {
-
-    // #[test]
 }

src/daq/record.rs

@@ -1,4 +1,5 @@
 use super::*;
+use crate::config::Flt;
 use anyhow::{bail, Error, Result};
 use clap::builder::OsStr;
 use crossbeam::atomic::AtomicCell;
@@ -10,8 +11,8 @@ use rayon::iter::Empty;
 use serde::de::IntoDeserializer;
 use std::path::{Path, PathBuf};
 use std::str::FromStr;
-use std::sync::atomic::Ordering::SeqCst;
+use std::sync::atomic::{AtomicBool, Ordering::SeqCst};
-use std::sync::Mutex;
+use std::sync::{Arc, Mutex};
 use std::thread::{spawn, JoinHandle};
 use std::time::Duration;
 use strum::EnumMessage;
@@ -100,7 +101,6 @@ impl Recording {
             DataType::I8 => Recording::create_dataset_type::<i8>(file, meta),
             DataType::I16 => Recording::create_dataset_type::<i16>(file, meta),
             DataType::I32 => Recording::create_dataset_type::<i32>(file, meta),
-            DataType::I64 => Recording::create_dataset_type::<i64>(file, meta),
             DataType::F32 => Recording::create_dataset_type::<f32>(file, meta),
             DataType::F64 => Recording::create_dataset_type::<f64>(file, meta),
         }
@@ -152,9 +152,6 @@ impl Recording {
                 let arr = ndarray::ArrayView2::<f64>::from_shape((framesPerBlock, nchannels), dat)?;
                 ds.write_slice(arr, (ctr, .., ..))?;
             }
-            RawStreamData::UnknownDataType => {
-                bail!("Unknown data type!")
-            }
             RawStreamData::StreamError(e) => {
                 bail!("Stream error: {}", e)
             }
@@ -289,17 +286,16 @@ impl Recording {
                         // Early stop. User stopped it.
                         break 'recloop;
                     }
-                    InStreamMsg::RawStreamData(incoming_ctr, dat) => {
+                    InStreamMsg::StreamData(dat) => {
                         if first {
                             first = false;
                             // Initialize counter offset
-                            ctr_offset = incoming_ctr;
+                            ctr_offset = dat.ctr;
-                        } else {
+                        } else if dat.ctr != stored_ctr + ctr_offset {
-                            if incoming_ctr != stored_ctr + ctr_offset {
                             println!("********** PACKAGES MISSED ***********");
                             bail!("Packages missed. Recording is invalid.")
                         }
-                        }
+
                         if wait_block_ctr > 0 {
                             // We are still waiting
                             wait_block_ctr -= 1;
@@ -316,7 +312,7 @@ impl Recording {
                         Recording::append_to_dset(
                             &ds,
                             stored_ctr,
-                            dat.as_ref(),
+                            &dat.raw,
                             framesPerBlock,
                             nchannels,
                         )?;

src/daq/streamcmd.rs

@@ -0,0 +1,31 @@
+//! Provides stream messages that come from a running stream
+use crate::config::*;
+use crate::daq::Qty;
+use crate::siggen::Siggen;
+use anyhow::{bail, Result};
+use crossbeam::channel::Sender;
+use std::any::TypeId;
+use std::sync::{Arc, RwLock};
+
+use super::*;
+cfg_if::cfg_if! {
+if #[cfg(feature = "python-bindings")] {
+    use pyo3::exceptions::PyValueError;
+    use pyo3::prelude::*;
+    use pyo3::{pymodule, pyclass, types::PyModule, PyResult};
+} else {} }
+
+/// Commands that can be sent to a running stream
+pub enum StreamCommand {
+    /// Add a new queue to a running stream
+    AddInQueue(SharedInQueue),
+
+    /// Remove a queue to a running stream
+    RemoveInQueue(SharedInQueue),
+
+    /// New signal generator config to be used
+    NewSiggen(Siggen),
+
+    /// Stop the thread, do not listen for data anymore.
+    StopThread,
+}

src/daq/streamdata.rs

@@ -0,0 +1,303 @@
+//! Provides stream messages that come from a running stream
+use crate::config::*;
+use crate::daq::Qty;
+use crate::siggen::Siggen;
+use anyhow::{bail, Result};
+use cpal::Sample;
+use crossbeam::channel::Sender;
+use reinterpret::{reinterpret_slice, reinterpret_vec};
+use std::any::TypeId;
+use std::sync::{Arc, RwLock};
+use std::u128::MAX;
+use strum_macros::Display;
+
+use super::*;
+cfg_if::cfg_if! {
+if #[cfg(feature = "python-bindings")] {
+    use pyo3::exceptions::PyValueError;
+    use pyo3::prelude::*;
+    use pyo3::{pymodule, pyclass, types::PyModule, PyResult};
+} else {} }
+
+/// Raw stream data coming from a stream.
+#[derive(Clone, Debug)]
+pub enum RawStreamData {
+    /// 8-bits integer
+    Datai8(Vec<i8>),
+    /// 16-bits integer
+    Datai16(Vec<i16>),
+    /// 32-bits integer
+    Datai32(Vec<i32>),
+    /// 32-bits float
+    Dataf32(Vec<f32>),
+    /// 64-bits float
+    Dataf64(Vec<f64>),
+
+    /// A stream error occured
+    StreamError(StreamError),
+}
+
+impl RawStreamData {
+    pub fn toFloat(&self, nchannels: usize) -> Dmat {
+        // match &self {
+        //     RawStreamData::Datai8(c) => {
+        //         Dmat::zeros((2, 2));
+        //     }
+        //     RawStreamData::Datai16(c) => {
+        //         Dmat::zeros((2, 2));
+        //     }
+        // }
+        todo!()
+    }
+}
+impl RawStreamData {
+    /// Get reference to raw data buffer
+    pub fn getRef<T>(&self) -> &[T]
+    where
+        T: Sample + 'static,
+    {
+        let thetype: TypeId = TypeId::of::<T>();
+        match &self {
+            RawStreamData::Datai8(t) => {
+                let i8type: TypeId = TypeId::of::<i8>();
+                assert!(thetype == i8type);
+                let v: &[T] = unsafe { reinterpret_slice(t) };
+                v
+            }
+            RawStreamData::Datai16(t) => {
+                let i16type: TypeId = TypeId::of::<i16>();
+                assert!(thetype == i16type);
+                let v: &[T] = unsafe { reinterpret_slice(t) };
+                v
+            }
+            RawStreamData::Datai32(t) => {
+                let i32type: TypeId = TypeId::of::<i32>();
+                assert!(thetype == i32type);
+                let v: &[T] = unsafe { reinterpret_slice(t) };
+                v
+            }
+            RawStreamData::Dataf32(t) => {
+                let f32type: TypeId = TypeId::of::<f32>();
+                assert!(thetype == f32type);
+                let v: &[T] = unsafe { reinterpret_slice(t) };
+                v
+            }
+            RawStreamData::Dataf64(t) => {
+                let f64type: TypeId = TypeId::of::<f64>();
+                assert!(thetype == f64type);
+                let v: &[T] = unsafe { reinterpret_slice(t) };
+                v
+            }
+            _ => panic!("Cannot getRef from "),
+        }
+    }
+}
+
+// Create InStreamData object from
+impl<T> From<&[T]> for RawStreamData
+where
+    T: num::ToPrimitive + Clone + 'static,
+{
+    fn from(input: &[T]) -> RawStreamData {
+        // Apparently, this code does not work with a match. I have searched around and have not found the
+        // reason for this. So this is a bit of stupid boilerplate.
+        let i8type: TypeId = TypeId::of::<i8>();
+        let i16type: TypeId = TypeId::of::<i16>();
+        let i32type: TypeId = TypeId::of::<i32>();
+        let f32type: TypeId = TypeId::of::<f32>();
+        let f64type: TypeId = TypeId::of::<f64>();
+        let thetype: TypeId = TypeId::of::<T>();
+        if i8type == thetype {
+            let v: Vec<i8> = unsafe { reinterpret_slice(input).to_vec() };
+            RawStreamData::Datai8(v)
+        } else if i16type == thetype {
+            let v: Vec<i16> = unsafe { reinterpret_slice(input).to_vec() };
+            RawStreamData::Datai16(v)
+        } else if i16type == thetype {
+            let v: Vec<i16> = unsafe { reinterpret_slice(input).to_vec() };
+            RawStreamData::Datai16(v)
+        } else if i32type == thetype {
+            let v: Vec<i32> = unsafe { reinterpret_slice(input).to_vec() };
+            RawStreamData::Datai32(v)
+        } else if f32type == thetype {
+            let v: Vec<f32> = unsafe { reinterpret_slice(input).to_vec() };
+            RawStreamData::Dataf32(v)
+        } else if f64type == thetype {
+            let v: Vec<f64> = unsafe { reinterpret_slice(input).to_vec() };
+            RawStreamData::Dataf64(v)
+        } else {
+            panic!("Not implemented sample type!")
+        }
+    }
+}
+
+// Create InStreamData object from
+impl<T> From<Vec<T>> for RawStreamData
+where
+    T: num::ToPrimitive + Clone + 'static,
+{
+    fn from(input: Vec<T>) -> RawStreamData {
+        // Apparently, this code does not work with a match. I have searched around and have not found the
+        // reason for this. So this is a bit of stupid boilerplate.
+        let i8type: TypeId = TypeId::of::<i8>();
+        let i16type: TypeId = TypeId::of::<i16>();
+        let i32type: TypeId = TypeId::of::<i32>();
+        let f32type: TypeId = TypeId::of::<f32>();
+        let f64type: TypeId = TypeId::of::<f64>();
+        let thetype: TypeId = TypeId::of::<T>();
+        if i8type == thetype {
+            let v: Vec<i8> = unsafe { reinterpret_vec(input) };
+            RawStreamData::Datai8(v)
+        } else if i16type == thetype {
+            let v: Vec<i16> = unsafe { reinterpret_vec(input) };
+            RawStreamData::Datai16(v)
+        } else if i16type == thetype {
+            let v: Vec<i16> = unsafe { reinterpret_vec(input) };
+            RawStreamData::Datai16(v)
+        } else if i32type == thetype {
+            let v: Vec<i32> = unsafe { reinterpret_vec(input) };
+            RawStreamData::Datai32(v)
+        } else if f32type == thetype {
+            let v: Vec<f32> = unsafe { reinterpret_vec(input) };
+            RawStreamData::Dataf32(v)
+        } else if f64type == thetype {
+            let v: Vec<f64> = unsafe { reinterpret_vec(input) };
+            RawStreamData::Dataf64(v)
+        } else {
+            panic!("Not implemented sample type!")
+        }
+    }
+}
+
+/// Stream metadata. All information required for properly interpreting the raw
+/// data that is coming from the stream.
+#[derive(Clone, Debug)]
+pub struct StreamMetaData {
+    /// Information for each channel in the stream
+    pub channelInfo: Vec<DaqChannel>,
+
+    /// The data type of the device [Number / voltage / Acoustic pressure / ...]
+    pub rawDatatype: DataType,
+
+    /// Sample rate in [Hz]
+    pub samplerate: Flt,
+
+    /// The number of frames per block of data that comes in. Multiplied by
+    /// channelInfo.len() we get the total number of samples that come in at
+    /// each callback.
+    pub framesPerBlock: usize,
+}
+impl StreamMetaData {
+    /// Create new metadata object.
+    ///     ///
+    /// # Args
+    ///
+    pub fn new(
+        channelInfo: &[DaqChannel],
+        rawdtype: DataType,
+        sr: Flt,
+        framesPerBlock: usize,
+    ) -> Result<StreamMetaData> {
+        Ok(StreamMetaData {
+            channelInfo: channelInfo.to_vec(),
+            rawDatatype: rawdtype,
+            samplerate: sr,
+            framesPerBlock,
+        })
+    }
+
+    /// Returns the number of channels in the stream metadata.
+    pub fn nchannels(&self) -> usize {
+        self.channelInfo.len()
+    }
+}
+
+/// Stream data (audio / other) coming from a stream or to be send to a stream
+#[derive(Debug)]
+pub struct StreamData {
+    /// Package counter. Should always increase monotonically.
+    pub ctr: usize,
+
+    /// Stream metadata. All info required for properly interpreting the raw data.
+    pub meta: Arc<StreamMetaData>,
+
+    /// This is typically what is stored when recording
+    pub raw: RawStreamData,
+
+    // Converted to floating point format. Used for further real time
+    // processing. Stored in an rw-lock. The first thread that acesses this data
+    // will perform the conversion. All threads after that will get the data.
+    converted: RwLock<Option<Arc<Dmat>>>,
+}
+impl StreamData {
+    /// Create new stream data object.
+    pub fn new(ctr: usize, meta: Arc<StreamMetaData>, raw: RawStreamData) -> StreamData {
+        StreamData {
+            ctr,
+            meta,
+            raw,
+            converted: RwLock::new(None),
+        }
+    }
+
+    /// Get the data in floating point format. If already converted, uses the
+    /// cached float data.
+    pub fn getFloatData(&self) -> Arc<Dmat> {
+        if let Some(dat) = self.converted.read().unwrap().as_ref() {
+            return dat.clone();
+        }
+
+        // In case we reach here, the data has not yet be converted to floating
+        // point, so we do this.
+        let mut o = self.converted.write().unwrap();
+
+        // It might be that another thread was 'first', and already performed
+        // the conversion. In that case, we still do an early return, and we
+        // just openend the lock twice for writing. Not a problem.
+        if let Some(dat) = o.as_ref() {
+            return dat.clone();
+        }
+        // Perform the actual conversion
+        let converted_data = Arc::new(self.raw.toFloat(self.meta.nchannels()));
+        // Replace the option with the Some
+        o.replace(converted_data.clone());
+
+        converted_data
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use num::traits::sign;
+    use cpal::Sample;
+
+    use super::*;
+
+    #[test]
+    fn test() {
+        
+        const fs: Flt = 20.;
+        // Number of samples per channel
+        const Nframes: usize = 20;
+        const Nch: usize = 2;
+        let mut signal = [0.; Nch*Nframes];
+        let mut siggen = Siggen::newSineWave(Nch, 1.);
+
+        siggen.reset(fs);
+        siggen.setMute(&[false, true]);
+        siggen.genSignal(&mut signal);
+
+        let raw: Vec<i16> = Vec::from_iter(signal.iter().map(
+            |o| o.to_sample::<i16>()));
+        
+        let ms1 = raw.iter().step_by(2).map(|s1| {*s1 as f64 * *s1 as f64}).sum::<f64>() / Nframes as f64;
+
+        let i16maxsq = (i16::MAX as f64).powf(2.);
+        // println!("ms1: {} {}", ms1, i16maxsq/2.);
+        // println!("{:?}", raw.iter().cloned().step_by(2).collect::<Vec<i16>>());
+        // println!("{:?}", i16::EQUILIBRIUM);
+        assert!(f64::abs(ms1 - i16maxsq/2.)/i16maxsq < 1e-3);
+
+    }
+
+}

src/daq/streamhandler.rs

@@ -1,5 +1,5 @@
 
-use crossbeam::channel::unbounded;
+use crossbeam::channel::{unbounded, Receiver};
 use super::*;
 
 /// A stream handler registers a queue in the stream manager, and keeps the other end to 

src/daq/streammgr.rs

@@ -0,0 +1,589 @@
+//! Data acquisition model. Provides abstract layers around DAQ devices.
+use super::api::*;
+use super::*;
+use crate::{
+    config::*,
+    siggen::{self, Siggen},
+};
+use anyhow::{bail, Error, Result};
+use array_init::from_iter;
+use core::time;
+use cpal::Sample;
+use crossbeam::{
+    channel::{unbounded, Receiver, Sender, TrySendError},
+    thread,
+};
+use std::sync::{atomic::AtomicBool, Arc, Mutex};
+use std::thread::{JoinHandle, Thread};
+
+#[cfg(feature = "cpal-api")]
+use super::api::api_cpal::CpalApi;
+
+cfg_if::cfg_if! {
+if #[cfg(feature = "python-bindings")] {
+    use pyo3::exceptions::PyValueError;
+    use pyo3::prelude::*;
+    use pyo3::{pymodule, types::PyModule, PyResult};
+} else {} }
+
+/// Store a queue in a shared pointer, to share sending
+/// and receiving part of the queue.
+pub type SharedInQueue = Sender<InStreamMsg>;
+/// Vector of queues for stream messages
+pub type InQueues = Vec<SharedInQueue>;
+
+struct StreamInfo<T> {
+    streamtype: StreamType,
+    stream: Box<dyn Stream>,
+    threadhandle: JoinHandle<T>,
+    comm: Sender<StreamCommand>,
+}
+
+/// Keep track of whether the stream has been created. To ensure singleton behaviour.
+static smgr_created: AtomicBool = AtomicBool::new(false);
+
+#[cfg_attr(feature = "python-bindings", pyclass(unsendable))]
+/// Configure and manage input / output streams.
+///
+pub struct StreamMgr {
+    // List of available devices
+    devs: Vec<DeviceInfo>,
+
+    // Input stream can be both input and duplex
+    input_stream: Option<StreamInfo<InQueues>>,
+
+    // Output only stream
+    output_stream: Option<StreamInfo<Siggen>>,
+
+    #[cfg(feature = "cpal-api")]
+    cpal_api: CpalApi,
+
+    /// The storage of queues. When no streams are running, they
+    /// are here. When stream is running, they will become available
+    /// in the JoinHandle of the thread.
+    instreamqueues: Option<InQueues>,
+
+    // Signal generator. Stored here on the bench in case no stream is running.
+    // It is picked when it is configured correctly for the starting output stream
+    // If it is not configured correctly, when a stream that outputs data is started
+    // ,it is removed here.
+    siggen: Option<crate::siggen::Siggen>,
+}
+
+#[cfg(feature = "python-bindings")]
+#[cfg_attr(feature = "python-bindings", pymethods)]
+impl StreamMgr {
+    #[new]
+    /// See (StreamMgr::new())
+    fn new_py<'py>() -> StreamMgr {
+        StreamMgr::new()
+    }
+
+    // #[pyo3(name = "unit")]
+    // #[staticmethod]
+    // /// See: [Biquad::unit()]
+    // pub fn unit_py() -> Biquad {
+    //     Biquad::unit()
+    // }
+    // #[pyo3(name = "firstOrderHighPass")]
+}
+impl StreamMgr {
+    /// Create new stream manager. A stream manager is supposed to be a singleton.
+    ///
+    /// # Panics
+    ///
+    /// When a StreamMgr object is already alive.
+    pub fn new() -> StreamMgr {
+        if smgr_created.load(std::sync::atomic::Ordering::Relaxed) {
+            panic!("BUG: Only one stream manager is supposed to be a singleton");
+        }
+        smgr_created.store(true, std::sync::atomic::Ordering::Relaxed);
+
+        let mut smgr = StreamMgr {
+            devs: vec![],
+            input_stream: None,
+            output_stream: None,
+            siggen: None,
+
+            #[cfg(feature = "cpal-api")]
+            cpal_api: CpalApi::new(),
+
+            instreamqueues: Some(vec![]),
+        };
+        smgr.devs = smgr.scanDeviceInfo();
+        smgr
+    }
+    
+    /// Get stream status for given stream type.
+    pub fn getStatus(&self, t: StreamType) -> StreamStatus {
+        match t {
+            StreamType::Input | StreamType::Duplex => {
+                if let Some(s) = &self.input_stream {
+                    s.stream.status()
+                } else {
+                    StreamStatus::NotRunning
+                }
+            }
+            StreamType::Output => {
+                if let Some(s) = &self.output_stream {
+                    s.stream.status()
+                } else {
+                    StreamStatus::NotRunning
+                }
+            }
+        }
+    }
+    /// Set a new signal generator. Returns an error if it is unapplicable.
+    /// It is unapplicable if the number of channels of output does not match the
+    /// number of output channels in a running stream.
+    pub fn setSiggen(&mut self, siggen: Siggen) -> Result<()> {
+        // Current signal generator. Where to place it?
+        if let Some(istream) = &self.input_stream {
+            if let StreamType::Duplex = istream.streamtype {
+                if siggen.nchannels() != istream.stream.noutchannels() {
+                    bail!("Invalid number of channels configured in signal generator")
+                }
+                assert!(self.siggen.is_none());
+                istream.comm.send(StreamCommand::NewSiggen(siggen)).unwrap();
+                return Ok(());
+            }
+        } else if let Some(os) = &self.output_stream {
+            assert!(self.siggen.is_none());
+            if siggen.nchannels() != os.stream.noutchannels() {
+                bail!("Invalid number of channels configured in signal generator")
+            }
+            os.comm.send(StreamCommand::NewSiggen(siggen)).unwrap();
+            return Ok(());
+        } else {
+            self.siggen = Some(siggen);
+            return Ok(());
+        }
+        unreachable!()
+    }
+
+    /// Obtain a list of devices that are available for each available API
+    pub fn getDeviceInfo(&mut self) -> &Vec<DeviceInfo> {
+        &self.devs
+    }
+
+    fn scanDeviceInfo(&self) -> Vec<DeviceInfo> {
+        let mut devinfo = vec![];
+        #[cfg(feature = "cpal-api")]
+        {
+            let cpal_devs = self.cpal_api.getDeviceInfo();
+            if let Ok(devs) = cpal_devs {
+                devinfo.extend(devs);
+            }
+        }
+        devinfo
+    }
+
+    /// Add a new queue to the lists of queues
+    pub fn addInQueue(&mut self, tx: Sender<InStreamMsg>) {
+        if let Some(is) = &self.input_stream {
+            is.comm.send(StreamCommand::AddInQueue(tx)).unwrap()
+        } else {
+            self.instreamqueues.as_mut().unwrap().push(tx);
+        }
+    }
+
+    fn startInputStreamThread(
+        &mut self,
+        meta: Arc<StreamMetaData>,
+        rx: Receiver<RawStreamData>,
+    ) -> (JoinHandle<InQueues>, Sender<StreamCommand>) {
+        let (commtx, commrx) = unbounded();
+
+        // Unwrap here, as the queues should be free to grab
+        let mut iqueues = self
+            .instreamqueues
+            .take()
+            .expect("No input streams queues!");
+
+        let threadhandle = std::thread::spawn(move || {
+            let mut ctr: usize = 0;
+            'infy: loop {
+                if let Ok(comm_msg) = commrx.try_recv() {
+                    match comm_msg {
+                        // New queue added
+                        StreamCommand::AddInQueue(queue) => {
+                            match queue.send(InStreamMsg::StreamStarted(meta.clone())) {
+                                Ok(()) => iqueues.push(queue),
+                                Err(_) => {}
+                            }
+                        }
+
+                        // Remove queue from list
+                        StreamCommand::RemoveInQueue(queue) => {
+                            iqueues.retain(|q| !q.same_channel(&queue))
+                        }
+
+                        // Stop this thread. Returns the queue
+                        StreamCommand::StopThread => {
+                            sendMsgToAllQueues(&mut iqueues, InStreamMsg::StreamStopped);
+                            break 'infy;
+                        }
+                        StreamCommand::NewSiggen(_) => {
+                            panic!("Error: signal generator send to input-only stream.");
+                        }
+                    }
+                }
+                if let Ok(raw) = rx.recv_timeout(time::Duration::from_millis(10)) {
+                    // println!("Obtained raw stream data!");
+
+                    let streamdata = StreamData::new(ctr, meta.clone(), raw);
+                    let streamdata = Arc::new(streamdata);
+
+                    let msg = InStreamMsg::StreamData(streamdata);
+                    sendMsgToAllQueues(&mut iqueues, msg);
+                    ctr += 1;
+                }
+            }
+            iqueues
+        });
+        (threadhandle, commtx)
+    }
+
+    // Match device info struct on given daq config.
+    fn match_devinfo(&self, cfg: &DaqConfig) -> Option<&DeviceInfo> {
+        for d in self.devs.iter() {
+            if d.device_name == cfg.device_name {
+                return Some(d);
+            }
+        }
+        None
+    }
+    fn startOuputStreamThread<T>(
+        &mut self,
+        meta: Arc<StreamMetaData>,
+        tx: Sender<RawStreamData>,
+    ) -> (JoinHandle<Siggen>, Sender<StreamCommand>) {
+        let (commtx, commrx) = unbounded();
+
+        // Number of channels to output for
+        let nchannels = meta.nchannels();
+
+        // Obtain signal generator. Set to silence when no signal generator is
+        // installed.
+        let mut siggen = self
+            .siggen
+            .take()
+            .unwrap_or_else(|| Siggen::newSilence(nchannels));
+
+        if siggen.nchannels() != nchannels {
+            // Updating number of channels
+            siggen.setNChannels(nchannels);
+        }
+        siggen.reset(meta.samplerate);
+
+        let threadhandle = std::thread::spawn(move || {
+            let mut floatbuf: Vec<Flt> = Vec::with_capacity(nchannels * meta.framesPerBlock);
+            'infy: loop {
+                if let Ok(comm_msg) = commrx.try_recv() {
+                    match comm_msg {
+                        // New queue added
+                        StreamCommand::AddInQueue(_) => {
+                            panic!("Invalid message send to output thread: AddInQueue");
+                        }
+
+                        // Remove queue from list
+                        StreamCommand::RemoveInQueue(_) => {
+                            panic!("Invalid message send to output thread: RemoveInQueue");
+                        }
+
+                        // Stop this thread. Returns the queue
+                        StreamCommand::StopThread => {
+                            break 'infy;
+                        }
+                        StreamCommand::NewSiggen(new_siggen) => {
+                            // println!("NEW SIGNAL GENERATOR ARRIVED!");
+                            siggen = new_siggen;
+                            siggen.reset(meta.samplerate);
+                            if siggen.nchannels() != nchannels {
+                                // println!("Updating channels");
+                                siggen.setNChannels(nchannels);
+                            }
+                        }
+                    }
+                }
+                while tx.len() < 2 {
+                    unsafe {
+                        floatbuf.set_len(nchannels * meta.framesPerBlock);
+                    }
+                    // Obtain signal
+                    siggen.genSignal(&mut floatbuf);
+                    // println!("level: {}", floatbuf.iter().sum::<Flt>());
+                    let msg = match meta.rawDatatype {
+                        DataType::I8 => {
+                            let v = Vec::<i8>::from_iter(floatbuf.iter().map(|f| f.to_sample()));
+                            RawStreamData::Datai8(v)
+                        }
+                        DataType::I16 => {
+                            let v = Vec::<i16>::from_iter(floatbuf.iter().map(|f| f.to_sample()));
+                            RawStreamData::Datai16(v)
+                        }
+                        DataType::I32 => {
+                            let v = Vec::<i32>::from_iter(floatbuf.iter().map(|f| f.to_sample()));
+                            RawStreamData::Datai32(v)
+                        }
+                        DataType::F32 => {
+                            let v = Vec::<f32>::from_iter(floatbuf.iter().map(|f| f.to_sample()));
+                            RawStreamData::Dataf32(v)
+                        }
+                        DataType::F64 => {
+                            let v = Vec::<f64>::from_iter(floatbuf.iter().map(|f| f.to_sample()));
+                            RawStreamData::Dataf64(v)
+                        }
+                    };
+                    if let Err(_e) = tx.send(msg) {
+                        // println!("Error sending raw stream data to output stream!");
+                        break 'infy;
+                    }
+                }
+
+                // }
+            }
+            siggen
+        });
+        (threadhandle, commtx)
+    }
+
+    /// Start a stream of certain type, using given configuration
+    pub fn startStream(&mut self, stype: StreamType, cfg: &DaqConfig) -> Result<()> {
+        match stype {
+            StreamType::Input | StreamType::Duplex => {
+                self.startInputOrDuplexStream(stype, cfg)?;
+            }
+            StreamType::Output => {
+                // self.startOutputStream(cfg)?;
+                bail!("No output stream defined yet");
+            }
+        }
+        Ok(())
+    }
+
+    // fn startOutputStream(&mut self, cfg: &DaqConfig) -> Result<()> {
+    //     let (tx, rx): (Sender<RawStreamData>, Receiver<RawStreamData>) = unbounded();
+    //     let stream = match cfg.api {
+    //         StreamApiDescr::Cpal => {
+    //             let devinfo = self
+    //                 .match_devinfo(cfg)
+    //                 .ok_or(anyhow::anyhow!("Unable to find device {}", cfg.device_name))?;
+    //             self.cpal_api.startOutputStream(devinfo, cfg, tx)?
+    //         }
+    //         _ => bail!("Unimplemented api!"),
+    //     };
+
+    //     Ok(())
+    // }
+
+    // Start an input or duplex stream
+    fn startInputOrDuplexStream(&mut self, stype: StreamType, cfg: &DaqConfig) -> Result<()> {
+        if self.input_stream.is_some() {
+            bail!("An input stream is already running. Please first stop existing input stream.")
+        }
+        if cfg.numberEnabledInChannels() == 0 {
+            bail!("At least one input channel should be enabled for an input stream")
+        }
+        if stype == StreamType::Duplex {
+            if cfg.numberEnabledOutChannels() == 0 {
+                bail!("At least one output channel should be enabled for a duplex stream")
+            }
+            if self.output_stream.is_some() {
+                bail!("An output stream is already running. Duplex mode stream cannot be started. Please first stop existing output stream.");
+            }
+        }
+        let (tx, rx): (Sender<RawStreamData>, Receiver<RawStreamData>) = unbounded();
+
+        let stream = match cfg.api {
+            StreamApiDescr::Cpal => {
+                if stype == StreamType::Duplex {
+                    bail!("Duplex mode not supported for CPAL api");
+                }
+                let devinfo = self
+                    .match_devinfo(cfg)
+                    .ok_or(anyhow::anyhow!("Unable to find device {}", cfg.device_name))?;
+                self.cpal_api.startInputStream(stype, devinfo, cfg, tx)?
+            }
+            _ => bail!("Unimplemented api!"),
+        };
+
+        // Input queues should be available, otherwise panic bug.
+        let iqueues = self.instreamqueues.as_mut().unwrap();
+
+        let meta = stream.metadata();
+
+        sendMsgToAllQueues(iqueues, InStreamMsg::StreamStarted(meta.clone()));
+
+        let (threadhandle, commtx) = self.startInputStreamThread(meta, rx);
+
+        self.input_stream = Some(StreamInfo {
+            streamtype: stype,
+            stream,
+            threadhandle,
+            comm: commtx,
+        });
+
+        Ok(())
+    }
+
+    /// Start a default input stream, using default settings on everything. This is only possible
+    /// when the CPAL_api is available
+    pub fn startDefaultInputStream(&mut self) -> Result<()> {
+        if self.input_stream.is_some() {
+            bail!("Input stream is already running. Please first stop existing input stream.")
+        }
+
+        let (tx, rx): (Sender<RawStreamData>, Receiver<RawStreamData>) = unbounded();
+
+        // Only a default input stream when CPAL feature is enabled
+        cfg_if::cfg_if! {
+        if #[cfg(feature="cpal-api")] {
+        let stream = self.cpal_api.startDefaultInputStream(tx)?;
+                // Inform all listeners of new stream data
+
+        let iqueues = self.instreamqueues.as_mut().unwrap();
+        let meta = stream.metadata();
+        sendMsgToAllQueues(iqueues, InStreamMsg::StreamStarted(meta.clone()));
+
+        let (threadhandle, commtx) = self.startInputStreamThread(meta, rx);
+
+        self.input_stream = Some(StreamInfo {
+            streamtype: StreamType::Input,
+            stream,
+            threadhandle,
+            comm: commtx,
+        });
+        Ok(())
+
+        }
+        else {
+        bail!("Unable to start default input stream: no CPAL api available")
+        }
+        }
+    }
+
+    /// Start a default output stream. Only possible when CPAL Api is available.
+    pub fn startDefaultOutputStream(&mut self) -> Result<()> {
+        if let Some(istream) = &self.input_stream {
+            if istream.streamtype == StreamType::Duplex {
+                bail!("Duplex stream is already running");
+            }
+        }
+        if self.output_stream.is_some() {
+            bail!("An output stream is already running. Duplex mode stream cannot be started. Please first stop existing output stream.");
+        }
+
+        cfg_if::cfg_if! {
+        if #[cfg(feature="cpal-api")] {
+
+        let (tx, rx)= unbounded();
+        let stream = self.cpal_api.startDefaultOutputStream(rx)?;
+        let meta = stream.metadata();
+        let (threadhandle, commtx) = self.startOuputStreamThread::<u16>(meta, tx);
+                // Inform all listeners of new stream data
+
+
+        self.output_stream = Some(StreamInfo {
+            streamtype: StreamType::Input,
+            stream,
+            threadhandle,
+            comm: commtx,
+        });
+        Ok(())
+
+        }  // end if cpal api available
+        else {
+        bail!("Unable to start default input stream: no CPAL api available")
+        }
+
+        } // end of cfg_if
+    }
+
+    /// Stop existing input stream.
+    pub fn stopInputStream(&mut self) -> Result<()> {
+        if let Some(StreamInfo {
+            streamtype: _, // Ignored here
+            stream: _,
+            threadhandle,
+            comm,
+        }) = self.input_stream.take()
+        {
+            // println!("Stopping existing stream..");
+            // Send thread to stop
+            comm.send(StreamCommand::StopThread).unwrap();
+
+            // Store stream queues back into StreamMgr
+            self.instreamqueues = Some(threadhandle.join().expect("Stream thread panicked!"));
+        } else {
+            bail!("Stream is not running.")
+        }
+        Ok(())
+    }
+    /// Stop existing output stream
+    pub fn stopOutputStream(&mut self) -> Result<()> {
+        if let Some(StreamInfo {
+            streamtype: _, // Ignored here
+            stream: _,
+            threadhandle,
+            comm,
+        }) = self.output_stream.take()
+        {
+            if let Err(_) = comm.send(StreamCommand::StopThread){
+                assert!(threadhandle.is_finished());
+            }
+            // println!("Wainting for threadhandle to join...");
+            self.siggen = Some(threadhandle.join().expect("Output thread panicked!"));
+            // println!("Threadhandle joined!");
+        } else {
+            bail!("Stream is not running.");
+        }
+        Ok(())
+    }
+    /// Stop existing running stream.
+    ///
+    /// Args
+    ///
+    /// * st: The stream type.
+    pub fn stopStream(&mut self, st: StreamType) -> Result<()> {
+        match st {
+            StreamType::Input | StreamType::Duplex => self.stopInputStream(),
+            StreamType::Output => self.stopOutputStream(),
+        }
+    }
+} // impl StreamMgr
+impl Drop for StreamMgr {
+    fn drop(&mut self) {
+        // Kill input stream if there is one
+        if self.input_stream.is_some() {
+            self.stopStream(StreamType::Input).unwrap();
+        }
+        if self.output_stream.is_some() {
+            // println!("Stopstream in Drop");
+            self.stopStream(StreamType::Output).unwrap();
+            // println!("Stopstream in Drop done");
+        }
+
+        // Decref the singleton
+        smgr_created.store(false, std::sync::atomic::Ordering::Relaxed);
+    }
+}
+
+// Send to all queues, remove queues that are disconnected when found out
+// on the way.
+fn sendMsgToAllQueues(iqueues: &mut InQueues, msg: InStreamMsg) {
+    // Loop over queues. Remove queues that error when we try to send
+    // to them
+    iqueues.retain(|q| match q.try_send(msg.clone()) {
+        Ok(_) => true,
+        Err(_e) => false,
+    });
+}
+/// Daq devices
+trait Daq {}
+
+#[cfg(test)]
+mod tests {
+
+    // #[test]
+}

src/daq/streammsg.rs

@@ -6,160 +6,18 @@ use anyhow::{bail, Result};
 use crossbeam::channel::Sender;
 use reinterpret::{reinterpret_slice, reinterpret_vec};
 use std::any::TypeId;
-use std::sync::Arc;
+use std::sync::{Arc, RwLock};
 use std::u128::MAX;
 use strum_macros::Display;
 
 use super::*;
-cfg_if::cfg_if! {
-if #[cfg(feature = "python-bindings")] {
-    use pyo3::exceptions::PyValueError;
-    use pyo3::prelude::*;
-    use pyo3::{pymodule, pyclass, types::PyModule, PyResult};
-} else {} }
 
-/// Raw stream data coming from a stream.
-#[derive(Clone, Debug)]
-pub enum RawStreamData {
-    /// 8-bits integer
-    Datai8(Arc<Vec<i8>>),
-    /// 16-bits integer
-    Datai16(Arc<Vec<i16>>),
-    /// 32-bits integer
-    Datai32(Arc<Vec<i32>>),
-    /// 32-bits float
-    Dataf32(Arc<Vec<f32>>),
-    /// 64-bits float
-    Dataf64(Arc<Vec<f64>>),
-
-    /// Unknown data type. We cannot do anything with it, we could instead also create an error, although this is easier to pass downstream.
-    UnknownDataType,
-
-    /// A stream error occured
-    StreamError(StreamError),
-}
-
-// Create InStreamData object from
-impl<T> From<&[T]> for RawStreamData
-where
-    T: num::ToPrimitive + Clone + 'static,
-{
-    fn from(input: &[T]) -> RawStreamData {
-        // Apparently, this code does not work with a match. I have searched around and have not found the
-        // reason for this. So this is a bit of stupid boilerplate.
-        let i8type: TypeId = TypeId::of::<i8>();
-        let i16type: TypeId = TypeId::of::<i16>();
-        let i32type: TypeId = TypeId::of::<i32>();
-        let f32type: TypeId = TypeId::of::<f32>();
-        let f64type: TypeId = TypeId::of::<f64>();
-        let thetype: TypeId = TypeId::of::<T>();
-        if i8type == thetype {
-            let v: Vec<i8> = unsafe { reinterpret_slice(input).to_vec() };
-            RawStreamData::Datai8(Arc::new(v))
-        } else if i16type == thetype {
-            let v: Vec<i16> = unsafe { reinterpret_slice(input).to_vec() };
-            RawStreamData::Datai16(Arc::new(v))
-        } else if i16type == thetype {
-            let v: Vec<i16> = unsafe { reinterpret_slice(input).to_vec() };
-            RawStreamData::Datai16(Arc::new(v))
-        } else if i32type == thetype {
-            let v: Vec<i32> = unsafe { reinterpret_slice(input).to_vec() };
-            RawStreamData::Datai32(Arc::new(v))
-        } else if f32type == thetype {
-            let v: Vec<f32> = unsafe { reinterpret_slice(input).to_vec() };
-            RawStreamData::Dataf32(Arc::new(v))
-        } else if f64type == thetype {
-            let v: Vec<f64> = unsafe { reinterpret_slice(input).to_vec() };
-            RawStreamData::Dataf64(Arc::new(v))
-        } else {
-            panic!("Not implemented sample type!")
-        }
-    }
-}
-
-// Create InStreamData object from
-impl<T> From<Vec<T>> for RawStreamData
-where
-    T: num::ToPrimitive + Clone + 'static,
-{
-    fn from(input: Vec<T>) -> RawStreamData {
-        // Apparently, this code does not work with a match. I have searched around and have not found the
-        // reason for this. So this is a bit of stupid boilerplate.
-        let i8type: TypeId = TypeId::of::<i8>();
-        let i16type: TypeId = TypeId::of::<i16>();
-        let i32type: TypeId = TypeId::of::<i32>();
-        let f32type: TypeId = TypeId::of::<f32>();
-        let f64type: TypeId = TypeId::of::<f64>();
-        let thetype: TypeId = TypeId::of::<T>();
-        if i8type == thetype {
-            let v: Vec<i8> = unsafe { reinterpret_vec(input) };
-            RawStreamData::Datai8(Arc::new(v))
-        } else if i16type == thetype {
-            let v: Vec<i16> = unsafe { reinterpret_vec(input) };
-            RawStreamData::Datai16(Arc::new(v))
-        } else if i16type == thetype {
-            let v: Vec<i16> = unsafe { reinterpret_vec(input) };
-            RawStreamData::Datai16(Arc::new(v))
-        } else if i32type == thetype {
-            let v: Vec<i32> = unsafe { reinterpret_vec(input) };
-            RawStreamData::Datai32(Arc::new(v))
-        } else if f32type == thetype {
-            let v: Vec<f32> = unsafe { reinterpret_vec(input) };
-            RawStreamData::Dataf32(Arc::new(v))
-        } else if f64type == thetype {
-            let v: Vec<f64> = unsafe { reinterpret_vec(input) };
-            RawStreamData::Dataf64(Arc::new(v))
-        } else {
-            panic!("Not implemented sample type!")
-        }
-    }
-}
-
-/// Stream metadata. All information required for
-#[derive(Clone, Debug)]
-pub struct StreamMetaData {
-    /// Information for each channel in the stream
-    pub channelInfo: Vec<DaqChannel>,
-
-    /// The data type of the device [Number / voltage]
-    pub rawDatatype: DataType,
-
-    /// Sample rate in [Hz]
-    pub samplerate: Flt,
-
-    /// The number of frames per block send over
-    pub framesPerBlock: usize,
-}
-impl StreamMetaData {
-    /// Create new metadata object.
-    ///     ///
-    /// # Args
-    ///
-    pub fn new(
-        channelInfo: &[DaqChannel],
-        rawdtype: DataType,
-        sr: Flt,
-        framesPerBlock: usize,
-    ) -> Result<StreamMetaData> {
-        Ok(StreamMetaData {
-            channelInfo: channelInfo.to_vec(),
-            rawDatatype: rawdtype,
-            samplerate: sr,
-            framesPerBlock,
-        })
-    }
-
-    /// Returns the number of channels in the stream metadata.
-    pub fn nchannels(&self) -> usize {
-        self.channelInfo.len()
-    }
-}
 /// Input stream messages, to be send to handlers.
 #[derive(Clone, Debug)]
 pub enum InStreamMsg {
     /// Raw stream data that is coming from a device. This is interleaved data. The number of channels is correct and
     /// specified in the stream metadata.
-    RawStreamData(usize, Arc<RawStreamData>),
+    StreamData(Arc<StreamData>),
 
     /// An error has occured in the stream
     StreamError(StreamError),
@@ -175,25 +33,6 @@ pub enum InStreamMsg {
     StreamStopped,
 }
 
-/// Store a queue in a shared pointer, to share sending
-/// and receiving part of the queue.
-pub type SharedInQueue = Sender<InStreamMsg>;
-/// Vector of queues for stream messages
-pub type InQueues = Vec<SharedInQueue>;
-
-/// Commands that can be sent to a running stream
-pub enum StreamCommand {
-    /// Add a new queue to a running stream
-    AddInQueue(SharedInQueue),
-    /// Remove a queue to a running stream
-    RemoveInQueue(SharedInQueue),
-
-    /// New signal generator config to be used
-    NewSiggen(Siggen),
-
-    /// Stop the thread, do not listen for data anymore.
-    StopThread,
-}
 
 /// Stream types that can be started
 ///
@@ -207,28 +46,3 @@ pub enum StreamType {
     /// Input and output at the same time
     Duplex,
 }
-
-/// Errors that happen in a stream
-#[derive(strum_macros::EnumMessage, Debug, Clone, Display)]
-pub enum StreamError {
-    /// Input overrun
-    #[strum(message = "InputXRunError", detailed_message = "Input buffer overrun")]
-    InputXRunError,
-    /// Output underrun
-    #[strum(
-        message = "OutputXRunError",
-        detailed_message = "Output buffer overrun"
-    )]
-    OutputXRunError,
-    /// Driver specific error
-    #[strum(message = "DriverError", detailed_message = "Driver error")]
-    DriverError,
-
-    /// Device
-    #[strum(detailed_message = "Device not available")]
-    DeviceNotAvailable,
-
-    /// Logic error (something weird happened)
-    #[strum(detailed_message = "Logic error")]
-    LogicError,
-}

src/daq/streamstatus.rs

@@ -0,0 +1,25 @@
+//! Provides stream messages that come from a running stream
+use strum_macros::Display;
+
+use super::*;
+cfg_if::cfg_if! {
+if #[cfg(feature = "python-bindings")] {
+    use pyo3::exceptions::PyValueError;
+    use pyo3::prelude::*;
+    use pyo3::{pymodule, pyclass, types::PyModule, PyResult};
+} else {} }
+
+/// Gives the stream status of a stream, either input / output or duplex.
+#[derive(strum_macros::EnumMessage, Debug, Clone, Copy, Display)]
+pub enum StreamStatus {
+    /// Stream is not running
+    #[strum(message = "NotRunning", detailed_message = "Stream is not running")]
+    NotRunning,
+    /// Stream is running properly
+    #[strum(message = "Running", detailed_message = "Stream is running")]
+    Running,
+
+    /// An error occured in the stream.
+    #[strum(message = "Error", detailed_message = "An error occured with the stream")]
+    Error(StreamError)
+}

src/filter.rs

@@ -61,7 +61,7 @@ impl Biquad {
     /// Create new biquad filter. See [Biquad::new()]
     ///
     pub fn new_py<'py>(coefs: PyReadonlyArrayDyn<Flt>) -> PyResult<Self> {
-        Ok(Biquad::new(&coefs.as_slice()?)?)
+        Ok(Biquad::new(coefs.as_slice()?)?)
     }
     #[pyo3(name = "unit")]
     #[staticmethod]
@@ -146,12 +146,12 @@ impl Biquad {
         Ok(Biquad::new(&coefs).unwrap())
     }
     fn filter_inout(&mut self, inout: &mut [Flt]) {
-        for sample in 0..inout.len() {
+        for sample in inout.iter_mut() {
-            let w0 = inout[sample] - self.a1 * self.w1 - self.a2 * self.w2;
+            let w0 = *sample - self.a1 * self.w1 - self.a2 * self.w2;
             let yn = self.b0 * w0 + self.b1 * self.w1 + self.b2 * self.w2;
             self.w2 = self.w1;
             self.w1 = w0;
-            inout[sample] = yn;
+            *sample = yn;
         }
         // println!("{:?}", inout);
     }
@@ -238,7 +238,7 @@ impl SeriesBiquad {
             biqs.push(biq);
         }
 
-        if biqs.len() == 0 {
+        if biqs.is_empty() {
             bail!("No filter coefficients given!");
         }
 

src/siggen.rs

@@ -18,6 +18,10 @@
 use super::config::*;
 use super::filter::Filter;
 use dasp_sample::{FromSample, Sample};
+use rayon::prelude::*;
+use std::fmt::Debug;
+use std::iter::ExactSizeIterator;
+use std::slice::IterMut;
 
 #[cfg(feature = "python-bindings")]
 use pyo3::prelude::*;
@@ -26,10 +30,12 @@ use rand::prelude::*;
 use rand::rngs::ThreadRng;
 use rand_distr::StandardNormal;
 
+const twopi: Flt = 2. * pi;
+
 /// Source for the signal generator. Implementations are sine waves, sweeps, noise.
 pub trait Source: Send {
     /// Generate the 'pure' source signal. Output is placed inside the `sig` argument.
-    fn genSignal_unscaled(&mut self, sig: &mut [Flt]);
+    fn genSignal_unscaled(&mut self, sig: &mut dyn ExactSizeIterator<Item = &mut Flt>);
     /// Reset the source state, i.e. set phase to 0, etc
     fn reset(&mut self, fs: Flt);
     /// Used to make the Siggen struct cloneable
@@ -41,6 +47,19 @@ impl Clone for Box<dyn Source> {
     }
 }
 
+#[derive(Clone)]
+struct Silence {}
+
+impl Source for Silence {
+    fn genSignal_unscaled(&mut self, sig: &mut dyn ExactSizeIterator<Item = &mut Flt>) {
+        sig.for_each(|s| *s = 0.0);
+    }
+    fn reset(&mut self, _fs: Flt) {}
+    fn clone_dyn(&self) -> Box<dyn Source> {
+        Box::new(self.clone())
+    }
+}
+
 /// White noise source
 #[derive(Clone)]
 struct WhiteNoise {}
@@ -51,9 +70,8 @@ impl WhiteNoise {
     }
 }
 impl Source for WhiteNoise {
-    fn genSignal_unscaled(&mut self, sig: &mut [Flt]) {
+    fn genSignal_unscaled(&mut self, sig: &mut dyn ExactSizeIterator<Item = &mut Flt>) {
-        sig.iter_mut()
+        sig.for_each(|s| *s = thread_rng().sample(StandardNormal));
-            .for_each(|s| *s = thread_rng().sample(StandardNormal));
     }
     fn reset(&mut self, _fs: Flt) {}
     fn clone_dyn(&self) -> Box<dyn Source> {
@@ -87,20 +105,18 @@ impl Sine {
     }
 }
 impl Source for Sine {
-    fn genSignal_unscaled(&mut self, sig: &mut [Flt]) {
+    fn genSignal_unscaled(&mut self, sig: &mut dyn ExactSizeIterator<Item = &mut Flt>) {
-        if self.fs < 0. {
+        if self.fs <= 0. {
-            sig.iter_mut().for_each(|s| {
+            sig.for_each(|s| {
                 *s = 0.;
             });
             return;
         }
-        sig.iter_mut().for_each(|s| {
+        sig.for_each(|s| {
             *s = Flt::sin(self.phase);
             self.phase += self.omg / self.fs;
+            self.phase %= twopi;
         });
-        while self.phase > 2. * pi {
-            self.phase -= 2. * pi;
-        }
     }
     fn reset(&mut self, fs: Flt) {
         self.fs = fs;
@@ -123,6 +139,12 @@ pub struct Siggen {
     source: Box<dyn Source>,
     // Filter applied to the source signal
     channels: Vec<SiggenChannelConfig>,
+
+    // Temporary source signal buffer
+    source_buf: Vec<Flt>,
+
+    // Output buffers (for filtered source signal)
+    chout_buf: Vec<Vec<Flt>>,
 }
 /// Multiple channel signal generator. Can use a single source (coherent) to provide multiple signals
 /// that can be sent out through different EQ's
@@ -134,6 +156,17 @@ impl Siggen {
         self.channels.len()
     }
 
+    /// Silence: create a signal generator that does not output any dynamic
+    /// signal at all.
+    pub fn newSilence(nchannels: usize) -> Siggen {
+        Siggen {
+            channels: vec![SiggenChannelConfig::new(); nchannels],
+            source: Box::new(Silence {}),
+            source_buf: vec![],
+            chout_buf: vec![],
+        }
+    }
+
     /// Create a white noise signal generator.
     pub fn newWhiteNoise(nchannels: usize) -> Siggen {
         Siggen::new(nchannels, Box::new(WhiteNoise::new()))
@@ -148,6 +181,27 @@ impl Siggen {
         self.channels.iter_mut().for_each(|set| set.setGain(g))
     }
 
+    /// Set the number of channels to generate a signal for. Truncates the
+    /// output in case the value before calling this method is too little.
+    /// Appends new channel configs in case to little is available.
+    ///
+    /// * nch: The new required number of channels
+    pub fn setNChannels(&mut self, nch: usize) {
+        self.channels.truncate(nch);
+
+        while self.channels.len() < nch {
+            self.channels.push(SiggenChannelConfig::new());
+        }
+    }
+
+    /// Set the DC offset for all channels
+    pub fn setDCOffset(&mut self,dc: &[Flt]) {
+        self.channels.iter_mut().zip(dc).for_each(
+            |(ch, dc)| {ch.DCOffset = *dc;});
+        
+
+    }
+
     /// Create a sine wave signal generator
     ///
     /// * freq: Frequency of the sine wave in \[Hz\]
@@ -160,44 +214,49 @@ impl Siggen {
         Siggen {
             source,
             channels: vec![SiggenChannelConfig::new(); nchannels],
+            source_buf: vec![],
+            chout_buf: vec![],
         }
     }
 
     /// Creates *interleaved* output signal
     pub fn genSignal<T>(&mut self, out: &mut [T])
     where
-        T: Sample + FromSample<Flt>,
+        T: Sample + FromSample<Flt> + Debug,
-        Flt: Sample
+        Flt: Sample,
     {
         let nch = self.nchannels();
         let nsamples: usize = out.len() / nch;
         assert!(out.len() % self.nchannels() == 0);
 
-        // No initialization required here, as the data is filled in in genSignal_unscaled
         // Create source signal
-        let mut src = Vec::with_capacity(nsamples);
+        self.source_buf.resize(nsamples, 0.);
-        unsafe {
+        self.source
-            src.set_len(nsamples);
+            .genSignal_unscaled(&mut self.source_buf.iter_mut());
-        }
+        // println!("Source signal: {:?}", self.source_buf);
-        self.source.genSignal_unscaled(&mut src);
-
-        // Create output temporary vector
-        let mut chout = Vec::with_capacity(nsamples);
-        unsafe {
-            chout.set_len(nsamples);
-        }
 
         // Write output while casted to the correct type
         // Iterate over each channel, and counter
-        for (ch, channel) in self.channels.iter_mut().enumerate() {
+        self.chout_buf.resize(nch, vec![]);
-            // Create output signal, overwrite chout, as it 
-            channel.genSignal(&src, &mut chout);
 
-            let out_iterator = out.iter_mut().skip(ch).step_by(nch);
+        for (channelno, (channel, chout)) in self
-            for (sampleout, samplein) in out_iterator.zip(&chout) {
+            .channels
-                *sampleout = samplein.to_sample();
+            .iter_mut()
-            }
+            .zip(self.chout_buf.iter_mut())
+            .enumerate()
+        {
+            chout.resize(nsamples, 0.);
+
+            // Create output signal, overwrite chout
+            channel.genSignal(&self.source_buf, chout);
+            // println!("Channel: {}, {:?}", channelno, chout);
+
+            let out_iterator = out.iter_mut().skip(channelno).step_by(nch);
+            out_iterator
+                .zip(chout)
+                .for_each(|(out, chin)| *out = chin.to_sample());
         }
+        // println!("{:?}", out);
     }
 
     /// Reset signal generator. Applies any kind of cleanup necessary.
@@ -212,18 +271,30 @@ impl Siggen {
     }
     /// Mute / unmute all channels at once
     pub fn setAllMute(&mut self, mute: bool) {
-        self.channels.iter_mut().for_each(|s| {s.muted = mute;});
+        self.channels.iter_mut().for_each(|s| {
+            s.setMute(mute);
+        });
+    }
+
+    /// Mute / unmute individual channels. Array of bools should have same size
+    /// as number of channels in signal generator.
+    pub fn setMute(&mut self, mute: &[bool]) {
+        assert!(mute.len() == self.nchannels());
+        self.channels.iter_mut().zip(mute).for_each(|(s, m)| {
+            s.setMute(*m);
+        });
     }
 }
 
 /// Signal generator config for a certain channel
 #[derive(Clone)]
-pub struct SiggenChannelConfig {
+struct SiggenChannelConfig {
     muted: bool,
     prefilter: Option<Box<dyn Filter>>,
     gain: Flt,
     DCOffset: Flt,
 }
+unsafe impl Send for SiggenChannelConfig {}
 impl SiggenChannelConfig {
     /// Set new pre-filter that filters the source signal
     pub fn setPreFilter(&mut self, pref: Option<Box<dyn Filter>>) {
@@ -301,17 +372,54 @@ mod test {
         // This code is just to check syntax. We should really be listening to these outputs.
         let mut t = [0.; 10];
         Siggen::newWhiteNoise(1).genSignal(&mut t);
-        println!("{:?}", &t);
+        // println!("{:?}", &t);
     }
 
     #[test]
     fn test_sine() {
-        // This code is just to check syntax. We should really be listening to these outputs.
+        // This code is just to check syntax. We should really be listening to
-        let mut s = [0.; 9];
+        // these outputs.
+        const N: usize = 10000;
+        let mut s1 = [0.; N];
+        let mut s2 = [0.; N];
         let mut siggen = Siggen::newSineWave(1, 1.);
-        siggen.reset(1.);
+
-        siggen.genSignal(&mut s);
+        siggen.reset(10.);
-        println!("{:?}", &s);
+        siggen.setAllMute(false);
+        siggen.genSignal(&mut s1);
+        siggen.genSignal(&mut s2);
+
+        let absdiff = s1.iter().zip(s2.iter()).map(|(s1, s2)| {Flt::abs(*s1-*s2)}).sum::<Flt>();
+        assert!(absdiff< 1e-10);
+    }
+
+    #[test]
+    fn test_sine2() {
+        // Test if channels are properly separated etc. Check if RMS is correct
+        // for amplitude = 1.0.
+        const fs: Flt = 10.;
+        // Number of samples per channel
+        const Nframes: usize = 10000;
+        const Nch: usize = 2;
+        let mut signal = [0.; Nch*Nframes];
+        let mut siggen = Siggen::newSineWave(Nch, 1.);
+
+        siggen.reset(fs);
+        siggen.setMute(&[false, true]);
+        // siggen.channels[0].DCOffset = 0.1;
+
+        // Split off in two terms, see if this works properly
+        siggen.genSignal(&mut signal[..Nframes/2]);
+        siggen.genSignal(&mut signal[Nframes/2..]);
+
+        // Mean square of the signal
+        let ms1 = signal.iter().step_by(2).map(|s1| {*s1 * *s1}).sum::<Flt>() / Nframes as Flt;
+        println!("ms1: {}",ms1);
+
+        let ms2 = signal.iter().skip(1).step_by(2).map(|s1| {*s1 * *s1}).sum::<Flt>() / Nframes as Flt;
+
+        assert!(Flt::abs(ms1 - 0.5) < 1e-12);
+        assert_eq!(ms2  , 0.);
     }
 
     // A small test to learn a bit about sample types and conversion. This
@@ -322,6 +430,5 @@ mod test {
         assert_eq!(1.0f32.to_sample::<i8>(), 127);
         assert_eq!(-1.0f32.to_sample::<i8>(), -127);
         assert_eq!(1.0f32.to_sample::<i16>(), i16::MAX);
-
     }
 }