Bugfix in type detection for instreammsg. Refactored some overcomplicated code, added first steps for rtaps

Cargo.toml

@@ -81,6 +81,9 @@ clap = { version = "4.5.8", features = ["derive", "color", "help", "suggestions"
 # FFT's
 realfft = "3.3.0"
 
+# Fast Mutex
+parking_lot = "0.12.3"
+
 [dev-dependencies]
 approx = "0.5.1"
 ndarray-rand = "0.14.0"

src/bin/lasp_inputdefault.rs

@@ -38,8 +38,9 @@ fn main() -> Result<()> {
                 // eprint!("Obtained message: {:?}", msg);
                 match msg {
                     InStreamMsg::StreamStarted(meta) => {
-                        println!("Stream started: {:?}", meta);
+                        println!("Stream started metadata: {meta:#?}");
                     },
+                    InStreamMsg::InStreamData(_) => {}
                     _ => { println!("Other msg...");}
                 }
             }

src/daq/api/api_cpal.rs

@@ -53,16 +53,16 @@ pub struct CpalApi {
 }
 pub struct CpalStream {
     stream: cpal::Stream,
-    md: Arc<StreamMetaData>,
+    metadata: Arc<StreamMetaData>,
     noutchannels: usize,
     status: Arc<AtomicCell<StreamStatus>>,
 }
 impl Stream for CpalStream {
     fn metadata(&self) -> Arc<StreamMetaData> {
-        self.md.clone()
+        self.metadata.clone()
     }
     fn ninchannels(&self) -> usize {
-        self.md.nchannels()
+        self.metadata.nchannels()
     }
     fn noutchannels(&self) -> usize {
         self.noutchannels
@@ -82,17 +82,14 @@ impl CpalApi {
         }
     }
     pub fn getDeviceInfo(&self) -> Result<Vec<DeviceInfo>> {
-        let srs_1 = [1000, 2000, 4000, 8000, 12000, 16000, 24000, 48000, 96000, 192000, 384000];
+        let srs_1 = [
+            1000, 2000, 4000, 8000, 12000, 16000, 24000, 48000, 96000, 192000, 384000,
+        ];
         let srs_2 = [11025, 22050, 44100, 88200];
 
         let mut srs_tot = Vec::from_iter(srs_1.iter().chain(srs_2.iter()));
         srs_tot.sort();
-        let srs_tot = Vec::from_iter(
+        let srs_tot = Vec::from_iter(srs_tot.iter().copied().map(|i| *i as Flt));
-            srs_tot
-                .iter()
-                .copied()
-                .map(|i| *i as Flt)
-        );
 
         // srs_tot.sort();
 
@@ -145,11 +142,8 @@ impl CpalApi {
                 continue;
             }
 
-            let dtypes: Vec<DataType> = sample_formats
+            let dtypes: Vec<DataType> =
-                .iter()
+                sample_formats.iter().dedup().map(|i| (*i).into()).collect();
-                .dedup()
-                .map(|i| (*i).into())
-                .collect();
 
             let prefDataType = match dtypes.iter().position(|d| d == &DataType::F32) {
                 Some(idx) => dtypes[idx],
@@ -189,8 +183,8 @@ 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: Option<Sender<RawStreamData>>,
+        send_ch: Option<Sender<InStreamMsg>>,
-        status: Arc<AtomicCell<StreamStatus>>
+        status: Arc<AtomicCell<StreamStatus>>,
     ) -> impl FnMut(cpal::StreamError) {
         move |err: cpal::StreamError| {
             let serr = match err {
@@ -198,19 +192,21 @@ impl CpalApi {
                 cpal::StreamError::BackendSpecific { err: _ } => StreamError::DriverError,
             };
             if let Some(sender) = &send_ch {
-                sender.send(RawStreamData::StreamError(serr)).unwrap();
+                sender.send(InStreamMsg::StreamError(serr)).unwrap();
             }
             status.store(StreamStatus::Error { e: serr });
         }
     }
 
     fn create_incallback<T>(
+        meta: Arc<StreamMetaData>,
         config: &cpal::StreamConfig,
-        sender: Sender<RawStreamData>,
+        sender: Sender<InStreamMsg>,
         framesPerBlock: usize,
-        en_inchannels: Vec<usize>
+        en_inchannels: Vec<usize>,
     ) -> impl FnMut(&[T], &cpal::InputCallbackInfo)
-        where T: 'static + Sample + ToPrimitive
+    where
+        T: 'static + Sample + ToPrimitive,
     {
         let tot_inch = config.channels as usize;
 
@@ -219,15 +215,16 @@ impl CpalApi {
         let mut enabled_ch_data: Vec<T> =
             vec![Sample::EQUILIBRIUM; en_inchannels.len() * framesPerBlock];
 
+        // let meta = StreamMetaData::new()
+        let mut ctr = 0;
+
         // 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
-
-                //         // 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
@@ -245,8 +242,14 @@ impl CpalApi {
                 q.drain(0..framesPerBlock * tot_inch);
 
                 // Send over data
-                let msg = RawStreamData::from(enabled_ch_data.clone());
+                let streamdata = Arc::new(InStreamData::new(
-                sender.send(msg).unwrap();
+                    ctr,
+                    meta.clone(),
+                    enabled_ch_data.clone(),
+                ));
+
+                sender.send(InStreamMsg::InStreamData(streamdata)).unwrap();
+                ctr += 1;
             }
         }
     }
@@ -257,12 +260,13 @@ impl CpalApi {
     ///
     /// * sf: Sample format
     fn build_input_stream(
+        meta: Arc<StreamMetaData>,
         sf: cpal::SampleFormat,
         config: &cpal::StreamConfig,
         device: &cpal::Device,
-        sender: Sender<RawStreamData>,
+        sender: Sender<InStreamMsg>,
         en_inchannels: Vec<usize>,
-        framesPerBlock: usize
+        framesPerBlock: usize,
     ) -> Result<(cpal::Stream, Arc<AtomicCell<StreamStatus>>)> {
         let status = Arc::new(AtomicCell::new(StreamStatus::NotRunning {}));
 
@@ -273,7 +277,9 @@ impl CpalApi {
                 match sf {
                     $(
                         $cpaltype => {
-                        let icb = CpalApi::create_incallback::<$rtype>(&config, sender, framesPerBlock, en_inchannels);
+                        let icb = CpalApi::create_incallback::<$rtype>(
+                            meta,
+                            &config, sender, framesPerBlock, en_inchannels);
                             device.build_input_stream(
                             &config,
                             icb,
@@ -284,8 +290,7 @@ impl CpalApi {
                 }
             };
         }
-        let stream: cpal::Stream =
+        let stream: cpal::Stream = build_stream!(
-            build_stream!(
         SampleFormat::I8 => i8,
         SampleFormat::I16 => i16,
         SampleFormat::I32 => i32,
@@ -299,15 +304,13 @@ impl CpalApi {
         streamstatus: Arc<AtomicCell<StreamStatus>>,
         receiver: Receiver<RawStreamData>,
         ch_config: &[DaqChannel],
-        framesPerBlock: usize
+        framesPerBlock: usize,
     ) -> impl FnMut(&mut [T], &cpal::OutputCallbackInfo)
-        where T: 'static + Sample + Debug
+    where
+        T: 'static + Sample + Debug,
     {
         let number_total_out_channels: usize = config.channels as usize;
-        let number_enabled_out_channels = ch_config
+        let number_enabled_out_channels = ch_config.iter().filter(|ch| ch.enabled).count();
-            .iter()
-            .filter(|ch| ch.enabled)
-            .count();
 
         let disabled_ch = DaqChannel::default();
         let disabled_repeater = std::iter::repeat(&disabled_ch);
@@ -329,10 +332,11 @@ impl CpalApi {
             let status = streamstatus.load();
             callback_ctr += 1;
 
-            let mut setToEquilibrium = ||
+            let mut setToEquilibrium = || {
                 outdata.iter_mut().for_each(|v| {
                     *v = Sample::EQUILIBRIUM;
-                });
+                })
+            };
             match status {
                 StreamStatus::NotRunning {} | StreamStatus::Error { .. } => {
                     setToEquilibrium();
@@ -355,19 +359,18 @@ impl CpalApi {
                 // All right, we have enough samples to send out! They are
                 // drained from the queue
                 let out_chunks = outdata.iter_mut().chunks(number_total_out_channels);
-                let siggen_chunks = q.drain(..nsamples_asked).chunks(number_enabled_out_channels);
+                let siggen_chunks = q
+                    .drain(..nsamples_asked)
+                    .chunks(number_enabled_out_channels);
                 for (och, ich) in out_chunks.into_iter().zip(siggen_chunks.into_iter()) {
-                    
                     let mut sig_frame_iter = ich.into_iter();
-                    och.into_iter()
+                    och.into_iter().zip(&enabled_outch).for_each(|(o, en)| {
-                        .zip(&enabled_outch)
+                        (if *en {
-                        .for_each(|(o, en)| (
-                            if *en {
                             *o = sig_frame_iter.next().unwrap();
                         } else {
                             *o = Sample::EQUILIBRIUM;
-                            }
+                        })
-                        ));
+                    });
                 }
 
                 // outdata
@@ -396,7 +399,7 @@ impl CpalApi {
         device: &cpal::Device,
         receiver: Receiver<RawStreamData>,
         ch_config: &[DaqChannel],
-        framesPerBlock: usize
+        framesPerBlock: usize,
     ) -> Result<(cpal::Stream, Arc<AtomicCell<StreamStatus>>)> {
         let status = Arc::new(AtomicCell::new(StreamStatus::NotRunning {}));
 
@@ -417,8 +420,7 @@ impl CpalApi {
                 }
             };
         }
-        let stream: cpal::Stream =
+        let stream: cpal::Stream = build_stream!(
-            build_stream!(
         SampleFormat::I8 => i8,
         SampleFormat::I16 => i16,
         SampleFormat::I32 => i32,
@@ -434,9 +436,10 @@ impl CpalApi {
         devinfo: &DeviceInfo,
         conf: &DaqConfig,
         _dev: &cpal::Device,
-        conf_iterator: T
+        conf_iterator: T,
     ) -> Result<cpal::SupportedStreamConfig>
-        where T: Iterator<Item = cpal::SupportedStreamConfigRange>
+    where
+        T: Iterator<Item = cpal::SupportedStreamConfigRange>,
     {
         let nchannels = match st {
             StreamType::Input => devinfo.iChannelCount,
@@ -448,9 +451,8 @@ impl CpalApi {
                 // Specified sample format is available
                 if cpalconf.channels() == (nchannels as u16) {
                     let requested_sr = conf.sampleRate(devinfo);
-                    if
+                    if (cpalconf.min_sample_rate().0 as Flt) <= requested_sr
-                        (cpalconf.min_sample_rate().0 as Flt) <= requested_sr &&
+                        && (cpalconf.max_sample_rate().0 as Flt) >= requested_sr
-                        (cpalconf.max_sample_rate().0 as Flt) >= requested_sr
                     {
                         // Sample rate falls within range.
                         let requested_fpb = conf.framesPerBlock(devinfo) as u32;
@@ -482,27 +484,25 @@ impl CpalApi {
         stype: StreamType,
         devinfo: &DeviceInfo,
         conf: &DaqConfig,
-        sender: Sender<RawStreamData>
+        sender: Sender<InStreamMsg>,
     ) -> Result<Box<dyn Stream>> {
         for cpaldev in self.host.devices()? {
             // See if we can create a supported stream config.
             let supported_config = (match stype {
                 StreamType::Duplex => bail!("Duplex stream not supported for CPAL"),
-                StreamType::Input =>
+                StreamType::Input => CpalApi::create_cpal_config(
-                    CpalApi::create_cpal_config(
                     stype,
                     devinfo,
                     conf,
                     &cpaldev,
-                        cpaldev.supported_input_configs()?
+                    cpaldev.supported_input_configs()?,
                 ),
-                StreamType::Output =>
+                StreamType::Output => CpalApi::create_cpal_config(
-                    CpalApi::create_cpal_config(
                     stype,
                     devinfo,
                     conf,
                     &cpaldev,
-                        cpaldev.supported_output_configs()?
+                    cpaldev.supported_output_configs()?,
                 ),
             })?;
             let framesPerBlock = conf.framesPerBlock(devinfo);
@@ -514,37 +514,34 @@ impl CpalApi {
                 &conf.enabledInchannelConfig(),
                 conf.dtype,
                 supported_config.sample_rate().0 as Flt,
-                framesPerBlock
+                framesPerBlock,
-            )?;
+            );
             let meta = Arc::new(meta);
 
             let (stream, status) = CpalApi::build_input_stream(
+                meta.clone(),
                 sf,
                 &config,
                 &cpaldev,
                 sender,
                 conf.enabledInchannelsList(),
-                framesPerBlock
+                framesPerBlock,
             )?;
 
             stream.play()?;
             status.store(StreamStatus::Running {});
 
-            return Ok(
+            return Ok(Box::new(CpalStream {
-                Box::new(CpalStream {
                 stream,
-                    md: meta,
+                metadata: meta,
                 noutchannels: 0,
                 status,
-                })
+            }));
-            );
         }
-        bail!(
+        bail!(format!(
-            format!(
             "Error: requested device {} not found. Please make sure the device is available.",
             devinfo.device_name
-            )
+        ))
-        )
     }
 
     /// Start a default input stream.
@@ -552,7 +549,7 @@ impl CpalApi {
     ///
     pub fn startDefaultInputStream(
         &mut self,
-        sender: Sender<RawStreamData>
+        sender: Sender<InStreamMsg>,
     ) -> Result<Box<dyn Stream>> {
         if let Some(device) = self.host.default_input_device() {
             if let Ok(config) = device.default_input_config() {
@@ -565,43 +562,41 @@ impl CpalApi {
                 let en_inchannels = Vec::from_iter((0..config.channels()).map(|i| i as usize));
 
                 let sf = config.sample_format();
+                // Specify data tape
+                let dtype = DataType::from(sf);
+
+                // Daq: default channel config
+                let daqchannels = Vec::from_iter(
+                    (0..final_config.channels)
+                        .map(|i| DaqChannel::defaultAudio(format!("Unnamed input channel {}", i))),
+                );
+                // Create stream metadata
+                let metadata = StreamMetaData::new(
+                    &daqchannels,
+                    dtype,
+                    config.sample_rate().0 as Flt,
+                    framesPerBlock,
+                );
+                let metadata = Arc::new(metadata);
+
                 let (stream, status) = CpalApi::build_input_stream(
+                    metadata.clone(),
                     sf,
                     &final_config,
                     &device,
                     sender,
                     en_inchannels,
-                    framesPerBlock
+                    framesPerBlock,
                 )?;
                 stream.play()?;
                 status.store(StreamStatus::Running {});
 
-                // Daq: default channel config
+                Ok(Box::new(CpalStream {
-                let daqchannels = Vec::from_iter(
-                    (0..final_config.channels).map(|i|
-                        DaqChannel::defaultAudio(format!("Unnamed input channel {}", i))
-                    )
-                );
-
-                // Specify data tape
-                let dtype = DataType::from(sf);
-
-                // Create stream metadata
-                let md = StreamMetaData::new(
-                    &daqchannels,
-                    dtype,
-                    config.sample_rate().0 as Flt,
-                    framesPerBlock
-                )?;
-                let md = Arc::new(md);
-                Ok(
-                    Box::new(CpalStream {
                     stream,
-                        md,
+                    metadata,
                     noutchannels: 0,
                     status,
-                    })
+                }))
-                )
             } else {
                 bail!("Could not obtain default input configuration")
             }
@@ -629,15 +624,14 @@ impl CpalApi {
 
     pub fn startDefaultOutputStream(
         &self,
-        receiver: Receiver<RawStreamData>
+        receiver: Receiver<RawStreamData>,
     ) -> Result<Box<dyn Stream>> {
         let (device, config, sampleformat, framesPerBlock) = self.getDefaultOutputConfig()?;
 
         // Daq: default channel config
         let daqchannels = Vec::from_iter(
-            (0..config.channels).map(|i|
+            (0..config.channels)
-                DaqChannel::defaultAudio(format!("Unnamed output channel {}", i))
+                .map(|i| DaqChannel::defaultAudio(format!("Unnamed output channel {}", i))),
-            )
         );
         let (stream, status) = CpalApi::build_output_stream(
             sampleformat,
@@ -645,7 +639,7 @@ impl CpalApi {
             &device,
             receiver,
             &daqchannels,
-            framesPerBlock
+            framesPerBlock,
         )?;
 
         stream.play()?;
@@ -659,12 +653,12 @@ impl CpalApi {
             &daqchannels,
             dtype,
             config.sample_rate.0 as Flt,
-            framesPerBlock
+            framesPerBlock,
-        )?;
+        );
         let md = Arc::new(md);
         let str = Box::new(CpalStream {
             stream,
-            md,
+            metadata: md,
             noutchannels: daqchannels.len(),
             status,
         });
@@ -674,7 +668,7 @@ impl CpalApi {
     fn getCPALOutputConfig(
         &self,
         dev: &DeviceInfo,
-        daqconfig: &DaqConfig
+        daqconfig: &DaqConfig,
     ) -> Result<(Device, cpal::StreamConfig, SampleFormat, usize)> {
         let samplerate = dev.avSampleRates[daqconfig.sampleRateIndex] as u32;
         let framesPerBlock = dev.avFramesPerBlock[daqconfig.framesPerBlockIndex];
@@ -716,12 +710,10 @@ impl CpalApi {
         &self,
         dev: &DeviceInfo,
         cfg: &DaqConfig,
-        receiver: Receiver<RawStreamData>
+        receiver: Receiver<RawStreamData>,
     ) -> Result<Box<dyn Stream>> {
-        let (device, cpalconfig, sampleformat, framesPerBlock) = self.getCPALOutputConfig(
+        let (device, cpalconfig, sampleformat, framesPerBlock) =
-            dev,
+            self.getCPALOutputConfig(dev, cfg)?;
-            cfg
-        )?;
 
         let (stream, status) = Self::build_output_stream(
             sampleformat,
@@ -729,7 +721,7 @@ impl CpalApi {
             &device,
             receiver,
             &cfg.outchannel_config,
-            framesPerBlock
+            framesPerBlock,
         )?;
 
         stream.play()?;
@@ -742,12 +734,12 @@ impl CpalApi {
             &cfg.enabledOutchannelConfig(),
             dtype,
             cpalconfig.sample_rate.0 as Flt,
-            framesPerBlock
+            framesPerBlock,
-        )?;
+        );
         let md = Arc::new(md);
         let str = Box::new(CpalStream {
             stream,
-            md,
+            metadata: md,
             noutchannels: cpalconfig.channels as usize,
             status,
         });

src/daq/api/mod.rs

@@ -8,7 +8,7 @@ use strum::EnumMessage;
 use strum_macros;
 use crate::config::*;
 
-use super::{streamdata::StreamMetaData, streamstatus::StreamStatus};
+use super::{StreamStatus, StreamMetaData};
 
 #[cfg(feature = "cpal-api")]
 pub mod api_cpal;

src/daq/mod.rs

@@ -19,6 +19,8 @@ mod qty;
 
 #[cfg(feature = "record")]
 mod record;
+#[cfg(feature = "record")]
+pub use record::*;
 
 mod streamcmd;
 mod streamdata;
@@ -26,6 +28,8 @@ mod streamhandler;
 mod streammgr;
 mod streammsg;
 mod streamstatus;
+mod streammetadata;
+mod streamerror;
 
 // Module re-exports
 pub use daqconfig::{DaqChannel, DaqConfig};
@@ -36,15 +40,14 @@ pub use streamhandler::StreamHandler;
 pub use streammgr::*;
 pub use streammsg::InStreamMsg;
 pub use streamstatus::StreamStatus;
+pub use streamdata::{RawStreamData, InStreamData};
+pub use streammetadata::StreamMetaData;
+pub use streamerror::StreamError;
 use api::*;
 
 #[cfg(feature = "record")]
-pub use record::*;
-
-use strum_macros::Display;
 
 use crate::config::*;
-use super::*;
 /// Stream types that can be started
 ///
 #[cfg_attr(feature = "python-bindings", pyclass)]
@@ -76,34 +79,3 @@ pub fn add_py_classses(m: &Bound<'_, PyModule>) -> PyResult<()> {
 
     Ok(())
 }
-
-/// Errors that happen in a stream
-#[derive(strum_macros::EnumMessage, Debug, Clone, Display, Copy)]
-#[cfg_attr(feature = "python-bindings", pyclass)]
-pub enum StreamError {
-    /// Input overrun
-    #[strum(
-        message = "InputOverrun Error",
-        detailed_message = "Input buffer overrun"
-    )]
-    InputOverrunError,
-
-    /// Output underrun
-    #[strum(
-        message = "OutputUnderrunError",
-        detailed_message = "Output buffer underrun"
-    )]
-    OutputUnderrunError,
-
-    /// Driver specific error
-    #[strum(message = "DriverError", detailed_message = "Driver error")]
-    DriverError,
-
-    /// Device
-    #[strum(detailed_message = "Device not available (anymore)")]
-    DeviceNotAvailable,
-
-    /// Logic error (something weird happened)
-    #[strum(detailed_message = "Logic error")]
-    LogicError,
-}

src/daq/record.rs

@@ -5,10 +5,11 @@ use clap::builder::OsStr;
 use crossbeam::atomic::AtomicCell;
 use hdf5::types::{VarLenArray, VarLenUnicode};
 use hdf5::{dataset, datatype, Dataset, File, H5Type};
+use parking_lot::Mutex;
 use std::path::{Path, PathBuf};
 use std::str::FromStr;
 use std::sync::atomic::{AtomicBool, Ordering::SeqCst};
-use std::sync::{Arc, Mutex};
+use std::sync::Arc;
 use std::thread::{spawn, JoinHandle};
 use std::time::Duration;
 use streamdata::*;
@@ -155,34 +156,35 @@ impl Recording {
     fn append_to_dset(
         ds: &Dataset,
         ctr: usize,
-        msg: &RawStreamData,
+        data: &InStreamData,
         framesPerBlock: usize,
         nchannels: usize,
     ) -> Result<()> {
-        match msg {
+        match data.getRaw() {
             RawStreamData::Datai8(dat) => {
-                let arr = ndarray::ArrayView2::<i8>::from_shape((framesPerBlock, nchannels), dat)?;
+                let arr = ndarray::ArrayView2::<i8>::from_shape((framesPerBlock, nchannels), &dat)?;
                 ds.write_slice(arr, (ctr, .., ..))?;
             }
             RawStreamData::Datai16(dat) => {
-                let arr = ndarray::ArrayView2::<i16>::from_shape((framesPerBlock, nchannels), dat)?;
+                let arr =
+                    ndarray::ArrayView2::<i16>::from_shape((framesPerBlock, nchannels), &dat)?;
                 ds.write_slice(arr, (ctr, .., ..))?;
             }
             RawStreamData::Datai32(dat) => {
-                let arr = ndarray::ArrayView2::<i32>::from_shape((framesPerBlock, nchannels), dat)?;
+                let arr =
+                    ndarray::ArrayView2::<i32>::from_shape((framesPerBlock, nchannels), &dat)?;
                 ds.write_slice(arr, (ctr, .., ..))?;
             }
             RawStreamData::Dataf32(dat) => {
-                let arr = ndarray::ArrayView2::<f32>::from_shape((framesPerBlock, nchannels), dat)?;
+                let arr =
+                    ndarray::ArrayView2::<f32>::from_shape((framesPerBlock, nchannels), &dat)?;
                 ds.write_slice(arr, (ctr, .., ..))?;
             }
             RawStreamData::Dataf64(dat) => {
-                let arr = ndarray::ArrayView2::<f64>::from_shape((framesPerBlock, nchannels), dat)?;
+                let arr =
+                    ndarray::ArrayView2::<f64>::from_shape((framesPerBlock, nchannels), &dat)?;
                 ds.write_slice(arr, (ctr, .., ..))?;
             }
-            RawStreamData::StreamError(e) => {
-                bail!("Stream error: {}", e)
-            }
         }
         Ok(())
     }
@@ -306,7 +308,6 @@ impl Recording {
                     InStreamMsg::StreamError(e) => {
                         bail!("Recording failed due to stream error: {}.", e)
                     }
-                    InStreamMsg::ConvertedStreamData(..) => {}
                     InStreamMsg::StreamStarted(_) => {
                         bail!("Stream started again?")
                     }
@@ -314,12 +315,12 @@ impl Recording {
                         // Early stop. User stopped it.
                         break 'recloop;
                     }
-                    InStreamMsg::StreamData(dat) => {
+                    InStreamMsg::InStreamData(instreamdata) => {
                         if first {
                             first = false;
                             // Initialize counter offset
-                            ctr_offset = dat.ctr;
+                            ctr_offset = instreamdata.ctr;
-                        } else if dat.ctr != stored_ctr + ctr_offset {
+                        } else if instreamdata.ctr != stored_ctr + ctr_offset {
                             println!("********** PACKAGES MISSED ***********");
                             bail!("Packages missed. Recording is invalid.")
                         }
@@ -340,7 +341,7 @@ impl Recording {
                         Recording::append_to_dset(
                             &ds,
                             stored_ctr,
-                            &dat.raw,
+                            &instreamdata,
                             framesPerBlock,
                             nchannels,
                         )?;

src/daq/streamdata.rs

@@ -1,153 +1,63 @@
 //! 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 cpal::{FromSample, Sample};
-use crossbeam::channel::Sender;
+use itertools::Itertools;
+use num::cast::AsPrimitive;
+use num::{Bounded, FromPrimitive, Num};
+
+use super::*;
+use super::*;
+use parking_lot::RwLock;
 use reinterpret::{reinterpret_slice, reinterpret_vec};
 use std::any::TypeId;
-use std::sync::{Arc, RwLock};
+use std::sync::Arc;
 use std::u128::MAX;
 use strum_macros::Display;
 
-use super::*;
+/// Raw stream data coming from a stream or going to a stream.
-
-/// Raw stream data coming from a stream.
 #[derive(Clone, Debug)]
 pub enum RawStreamData {
-    /// 8-bits integer
+    /// 8-bits integers
     Datai8(Vec<i8>),
-    /// 16-bits integer
+    /// 16-bits integers
     Datai16(Vec<i16>),
-    /// 32-bits integer
+    /// 32-bits integers
     Datai32(Vec<i32>),
-    /// 32-bits float
+    /// 32-bits floats
     Dataf32(Vec<f32>),
-    /// 64-bits float
+    /// 64-bits floats
     Dataf64(Vec<f64>),
-
-    /// A stream error occured
-    StreamError(StreamError),
 }
 
 impl RawStreamData {
-    pub fn toFloat(&self, _nchannels: usize) -> Dmat {
+    /// Create raw stream data from slice of data, or vec of data. Copies over
-        // match &self {
+    /// the data.
-        //     RawStreamData::Datai8(c) => {
+    fn new<T, U>(input: T) -> RawStreamData
-        //         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,
+        T: Into<Vec<U>> + 'static,
+        U: num::ToPrimitive + Clone + 'static,
     {
-        let thetype: TypeId = TypeId::of::<T>();
+        let input = input.into();
-        match &self {
+        // Apparently, this code does not work with a match. I have searched
-            RawStreamData::Datai8(t) => {
+        // around and have not found the reason for this. So this is a bit of
+        // stupid boilerplate.
         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
+        // The type to create for
-impl<T> From<&[T]> for RawStreamData
+        let thetype: TypeId = TypeId::of::<U>();
-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)
@@ -158,57 +68,49 @@ where
             let v: Vec<f64> = unsafe { reinterpret_vec(input) };
             RawStreamData::Dataf64(v)
         } else {
-            panic!("Not implemented sample type!")
+            panic!("Not implemented sample type! Type: {thetype:?}, i8 = {i8type:?}, i16 = {i16type:?}, i32 = {i32type:?}, f32 = {f32type:?}, f64 = {f64type:?}.")
         }
     }
-}
+    /// Return a reference to the slice of data.
-
-/// 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(
+    /// # Panics
-        channelInfo: &[DaqChannel],
+    ///
-        rawdtype: DataType,
+    /// - If the tye requested does not match the type stored.
-        sr: Flt,
+    pub fn getRef<T>(&self) -> &[T]
-        framesPerBlock: usize,
+    where
-    ) -> Result<StreamMetaData> {
+        T: Sample + 'static,
-        Ok(StreamMetaData {
+    {
-            channelInfo: channelInfo.to_vec(),
+        let type_requested = TypeId::of::<T>();
-            rawDatatype: rawdtype,
+        macro_rules! ret_ref {
-            samplerate: sr,
+            ($c:expr,$t:ty) => {{
-            framesPerBlock,
+                let type_this = TypeId::of::<$t>();
-        })
+                assert_eq!(type_requested, type_this, "Wrong type requested");
+                unsafe { reinterpret_slice::<$t, T>(&$c) }
+            }};
+        }
+        use RawStreamData::*;
+        match &self {
+            Datai8(v) => {
+                ret_ref!(v, i8)
+            }
+            Datai16(v) => {
+                ret_ref!(v, i16)
+            }
+            Datai32(v) => {
+                ret_ref!(v, i32)
+            }
+            Dataf32(v) => {
+                ret_ref!(v, f32)
+            }
+            Dataf64(v) => {
+                ret_ref!(v, f64)
+            }
         }
-
-    /// 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 {
+pub struct InStreamData {
     /// Package counter. Should always increase monotonically.
     pub ctr: usize,
 
@@ -216,45 +118,177 @@ pub struct StreamData {
     pub meta: Arc<StreamMetaData>,
 
     /// This is typically what is stored when recording
-    pub raw: RawStreamData,
+    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 {
+
+impl InStreamData {
+    #[inline]
+    /// Return reference to underlying raw data storage
+    pub fn getRaw(&self) -> &RawStreamData {
+        return &self.raw;
+    }
+    #[inline]
+    /// Convenience function to return the number of channels in this instreamdata.
+    pub fn nchannels(&self) -> usize {
+        return self.meta.nchannels();
+    }
+    /// Iterate over raw data of a certain channel. Tye should be specificied
+    /// and if not set correctly, this results in undefined behavior
+    pub fn iter_channel_raw<'a, T>(&'a self, ch: usize) -> impl Iterator<Item = &'a T> + 'a
+    where
+        T: Sample + Copy + 'static,
+    {
+        let type_requested: TypeId = TypeId::of::<T>();
+        macro_rules! create_iter {
+            ($c:expr,$t:ty) => {{
+                // Check that the type matches the type stored
+                let cur_type: TypeId = TypeId::of::<$t>();
+                assert!(
+                    type_requested == cur_type,
+                    "BUG: Type mismatch on channel data iterator"
+                );
+                let v: &'a [T] = unsafe { reinterpret_slice($c) };
+                v.iter().skip(ch).step_by(self.meta.nchannels())
+            }};
+        };
+
+        match &self.raw {
+            RawStreamData::Datai8(c) => {
+                create_iter!(c, i8)
+            }
+            RawStreamData::Datai16(c) => {
+                create_iter!(c, i16)
+            }
+            RawStreamData::Datai32(c) => {
+                create_iter!(c, i32)
+            }
+            RawStreamData::Dataf32(c) => {
+                create_iter!(c, f32)
+            }
+            RawStreamData::Dataf64(c) => {
+                create_iter!(c, f64)
+            }
+        }
+    }
+    /// Iterate over all channels, deinterleaved. So first all samples from the
+    /// first channel, etc...
+    pub fn iter_deinterleaved_raw_allchannels<'a, T>(
+        &'a self,
+    ) -> Box<dyn Iterator<Item = &'a T> + 'a>
+    where
+        T: Sample + Copy + 'static,
+    {
+        Box::new(
+            (0..self.meta.nchannels())
+                .into_iter()
+                .flat_map(|chi| self.iter_channel_raw(chi)),
+        )
+    }
+    fn iter_channel_converted<'a, T>(&'a self, ch: usize) -> impl Iterator<Item = Flt> + 'a
+    where
+        T: Sample + Copy + 'static,
+        Flt: FromSample<T>,
+    {
+        self.iter_channel_raw(ch)
+            .copied()
+            .map(move |v: T| Flt::from_sample(v) / self.meta.channelInfo[ch].sensitivity)
+    }
+
+    /// Iterate over data. where data is converted to floating point, and
+    /// corrected for sensivity values. Returns all data, in order of channel.
+    pub fn iter_deinterleaved_converted<'a, T>(&'a self) -> Box<dyn Iterator<Item = Flt> + 'a>
+    where
+        T: Sample + Copy + 'static,
+        Flt: FromSample<T>,
+    {
+        Box::new(
+            (0..self.meta.nchannels())
+                .into_iter()
+                .flat_map(move |chi| self.iter_channel_converted(chi)),
+        )
+    }
+
     /// Create new stream data object.
-    pub fn new(ctr: usize, meta: Arc<StreamMetaData>, raw: RawStreamData) -> StreamData {
+    pub fn new<T, U>(ctr: usize, meta: Arc<StreamMetaData>, raw: T) -> InStreamData
-        StreamData {
+    where
+        T: Into<Vec<U>> + 'static,
+        U: Sample + num::ToPrimitive + Clone + 'static,
+    {
+        InStreamData {
             ctr,
             meta,
-            raw,
+            raw: RawStreamData::new(raw),
             converted: RwLock::new(None),
         }
     }
 
+    /// Returns the number of frames in this InstreamData
+    pub fn nframes(&self) -> usize {
+        let nch = self.meta.nchannels();
+        match &self.raw {
+            RawStreamData::Datai8(c) => {
+                return c.len() / nch;
+            }
+            RawStreamData::Datai16(c) => {
+                return c.len() / nch;
+            }
+            RawStreamData::Datai32(c) => {
+                return c.len() / nch;
+            }
+            RawStreamData::Dataf32(c) => {
+                return c.len() / nch;
+            }
+            RawStreamData::Dataf64(c) => {
+                return c.len() / nch;
+            }
+        }
+    }
     /// 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() {
+        if let Some(dat) = self.converted.read().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();
+        let mut write_lock = self.converted.write();
 
         // 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() {
+        if let Some(dat) = write_lock.as_ref() {
             return dat.clone();
         }
+
+        let errmsg = "Data cannot be converted to floating point";
+
+        macro_rules! convert_data {
+            ($t:ty) => {
+                Dmat::from_shape_vec(
+                    (self.nframes(), self.nchannels()).f(),
+                    self.iter_deinterleaved_converted::<$t>().collect(),
+                )
+                .expect(errmsg)
+            };
+        };
+
         // Perform the actual conversion
-        let converted_data = Arc::new(self.raw.toFloat(self.meta.nchannels()));
+        let converted_data = match &self.raw {
+            RawStreamData::Datai8(_) => convert_data!(i8),
+            RawStreamData::Datai16(_) => convert_data!(i16),
+            RawStreamData::Datai32(_) => convert_data!(i32),
+            RawStreamData::Dataf32(_) => convert_data!(f32),
+            RawStreamData::Dataf64(_) => convert_data!(f64),
+        };
+        let converted_data = Arc::new(converted_data);
         // Replace the option with the Some
-        o.replace(converted_data.clone());
+        write_lock.replace(converted_data.clone());
 
         converted_data
     }
@@ -262,14 +296,14 @@ impl StreamData {
 
 #[cfg(test)]
 mod test {
-    use num::traits::sign;
     use cpal::Sample;
+    use num::traits::sign;
 
     use super::*;
+    use crate::siggen::Siggen;
 
     #[test]
     fn test() {
-        
         const fs: Flt = 20.;
         // Number of samples per channel
         const Nframes: usize = 20;
@@ -281,17 +315,19 @@ mod test {
         siggen.setMute(&[false, true]);
         siggen.genSignal(&mut signal);
 
-        let raw: Vec<i16> = Vec::from_iter(signal.iter().map(
+        let raw: Vec<i16> = Vec::from_iter(signal.iter().map(|o| o.to_sample::<i16>()));
-            |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 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/streamerror.rs

@@ -0,0 +1,32 @@
+use strum_macros::Display;
+
+/// Errors that happen in a stream
+#[derive(strum_macros::EnumMessage, Debug, Clone, Display, Copy)]
+#[cfg_attr(feature = "python-bindings", pyclass)]
+pub enum StreamError {
+    /// Input overrun
+    #[strum(
+        message = "InputOverrun Error",
+        detailed_message = "Input buffer overrun"
+    )]
+    InputOverrunError,
+
+    /// Output underrun
+    #[strum(
+        message = "OutputUnderrunError",
+        detailed_message = "Output buffer underrun"
+    )]
+    OutputUnderrunError,
+
+    /// Driver specific error
+    #[strum(message = "DriverError", detailed_message = "Driver error")]
+    DriverError,
+
+    /// Device
+    #[strum(detailed_message = "Device not available (anymore)")]
+    DeviceNotAvailable,
+
+    /// Logic error (something weird happened)
+    #[strum(detailed_message = "Logic error")]
+    LogicError,
+}

src/daq/streamhandler.rs

@@ -13,7 +13,13 @@ impl StreamHandler {
     /// Create new stream handler.
     pub fn new(smgr: &mut StreamMgr) -> StreamHandler{
         let (tx, rx) = unbounded();
+
+        // The queue there is not 'drop()' in streamhandler, as StreamMgr
+        // detects on its own when the stream other end of the channel is
+        // dropped.
         smgr.addInQueue(tx);
         StreamHandler{rx}
     }
+
 }
+

src/daq/streammetadata.rs

@@ -0,0 +1,60 @@
+use super::*;
+use crate::config::Flt;
+use anyhow::Result;
+/// 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<'a, T>(
+        channelInfo: T,
+        rawdtype: DataType,
+        sr: Flt,
+        framesPerBlock: usize,
+    ) -> StreamMetaData
+    where
+        T: IntoIterator<Item = &'a DaqChannel>,
+    {
+        let channelInfo = channelInfo
+            .into_iter()
+            .inspect(|ch| {
+                assert!(
+                    ch.enabled,
+                    "Only enabled channels should be given as input to StreamMetaData"
+                );
+            })
+            .cloned()
+            .collect();
+        StreamMetaData {
+            channelInfo,
+            rawDatatype: rawdtype,
+            samplerate: sr,
+            framesPerBlock,
+        }
+    }
+
+    /// Returns the number of channels in the stream metadata.
+    #[inline]
+    pub fn nchannels(&self) -> usize {
+        self.channelInfo.len()
+    }
+}

src/daq/streammgr.rs

@@ -1,5 +1,4 @@
 //! Data acquisition model. Provides abstract layers around DAQ devices.
-use super::config::*;
 use super::*;
 use crate::{
     config::*,
@@ -18,6 +17,7 @@ use std::sync::{atomic::AtomicBool, Arc, Mutex};
 use std::thread::{JoinHandle, Thread};
 use streamcmd::StreamCommand;
 use streamdata::*;
+use streammetadata::*;
 use streammsg::*;
 
 #[cfg(feature = "cpal-api")]
@@ -129,7 +129,7 @@ impl StreamMgr {
     ///
     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");
+            panic!("BUG: Stream manager is supposed to be a singleton");
         }
         smgr_created.store(true, std::sync::atomic::Ordering::Relaxed);
 
@@ -238,7 +238,7 @@ impl StreamMgr {
     fn startInputStreamThread(
         &mut self,
         meta: Arc<StreamMetaData>,
-        rx: Receiver<RawStreamData>,
+        rx: Receiver<InStreamMsg>,
     ) -> (JoinHandle<InQueues>, Sender<StreamCommand>) {
         let (commtx, commrx) = unbounded();
 
@@ -274,13 +274,12 @@ impl StreamMgr {
                         }
                     }
                 }
-                if let Ok(raw) = rx.recv_timeout(time::Duration::from_millis(10)) {
+                if let Ok(msg) = rx.recv_timeout(time::Duration::from_millis(10)) {
                     // println!("Obtained raw stream data!");
+                    if let InStreamMsg::StreamError(e) = msg {
 
-                    let streamdata = StreamData::new(ctr, meta.clone(), raw);
+                    }
-                    let streamdata = Arc::new(streamdata);
 
-                    let msg = InStreamMsg::StreamData(streamdata);
                     sendMsgToAllQueuesRemoveUnused(&mut iqueues, msg);
                     ctr += 1;
                 }
@@ -384,7 +383,6 @@ impl StreamMgr {
                     }
                 }
 
-                // }
             }
             siggen
         });
@@ -450,7 +448,7 @@ impl StreamMgr {
                 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 (tx, rx): (Sender<InStreamMsg>, Receiver<InStreamMsg>) = unbounded();
 
         let stream = match cfg.api {
             StreamApiDescr::Cpal => {
@@ -495,7 +493,7 @@ impl StreamMgr {
             bail!("Input stream is already running. Please first stop existing input stream.")
         }
 
-        let (tx, rx): (Sender<RawStreamData>, Receiver<RawStreamData>) = unbounded();
+        let (tx, rx): (Sender<InStreamMsg>, Receiver<InStreamMsg>) = unbounded();
 
         // Only a default input stream when CPAL feature is enabled
         cfg_if::cfg_if! {

src/daq/streammsg.rs

@@ -18,15 +18,11 @@ use super::*;
 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.
-    StreamData(Arc<StreamData>),
+    InStreamData(Arc<InStreamData>),
 
     /// An error has occured in the stream
     StreamError(StreamError),
 
-    /// Stream data converted to floating point with sample width as
-    /// compiled in.
-    ConvertedStreamData(usize, Arc<crate::config::Dmat>),
-
     /// new Stream metadata enters the scene. Probably a new stream started.
     StreamStarted(Arc<StreamMetaData>),
 

src/lib.rs

@@ -39,6 +39,7 @@ pub mod filter;
 pub mod ps;
 pub mod siggen;
 use filter::*;
+pub mod rt;
 
 /// A Python module implemented in Rust.
 #[cfg(feature = "python-bindings")]

src/math/mod.rs

@@ -0,0 +1,4 @@
+//! General math tools that are internally required
+//! 
+//! 
+

src/rt/mod.rs

@@ -0,0 +1,4 @@
+//! Real time signal analysis blocks, used for visual inspection and showing
+//! data 'on the fly'. Examples are real time power spectra plotting
+//! (Spectrograms, Auto powers, ..., or )
+mod rtaps;

src/rt/rtaps.rs

@@ -0,0 +1,137 @@
+use std::ops::Deref;
+use std::thread::{self, JoinHandle};
+
+use crate::daq::{InStreamMsg, StreamHandler, StreamMetaData, StreamMgr};
+use crate::ps::{AvPowerSpectra, CPSResult};
+use crate::I;
+use anyhow::Result;
+use parking_lot::Mutex;
+use rayon::ThreadPool;
+use std::sync::Arc;
+
+enum RtApsComm {
+    CommStopThread,
+    NewResult(CPSResult),
+    NewMeta(Arc<StreamMetaData>),
+}
+
+/// Real time power spectra viewer. Shows cross-power or auto-power signal 'time-dependent'
+pub struct RtAps {
+    /// Storage for optional last result
+    comm: Arc<Mutex<Option<RtApsComm>>>,
+}
+
+impl RtAps {
+    /// Build new Real time power spectra computing engine.
+    pub fn build(mgr: &mut StreamMgr) -> Result<RtAps> {
+        // Handler needs to be created here.
+        let handler = StreamHandler::new(mgr);
+        let last_result = Arc::new(Mutex::new(None));
+        let last_result2 = last_result.clone();
+
+        let mut aps = AvPowerSpectra::build(2048, None, None, None)?;
+
+        let thread = std::thread::spawn(move || {
+            println!("Thread started...");
+            let rx = handler.rx;
+            // What is running on the thread
+
+            let mut last_cps: Option<CPSResult> = None;
+            let mut meta: Option<Arc<StreamMetaData>> = None;
+
+            'mainloop: loop {
+                println!("LOOP");
+                'msgloop: for msg in &rx {
+                    println!("Message found!");
+                    match msg {
+                        InStreamMsg::StreamStarted(new_meta) => {
+                            aps.reset();
+                            last_cps = None;
+                            meta = Some(new_meta);
+                            break 'msgloop;
+                        }
+                        InStreamMsg::StreamStopped | InStreamMsg::StreamError(_) => {
+                            debug_assert!(meta.is_none());
+                            last_cps = None;
+                        }
+                        InStreamMsg::InStreamData(id) => {
+                            debug_assert!(meta.is_none());
+                            let flt = id.getFloatData();
+                            if let Some(cpsresult) = aps.compute_last(flt.view()) {
+                                last_cps = Some(cpsresult.clone());
+                            }
+                        }
+                    }
+                }
+
+                println!("LOOP2");
+                // Communicate last result, if any.
+                'commscope: {
+                    let mut last_result_lock = last_result.lock();
+
+                    if let Some(RtApsComm::CommStopThread) = *last_result_lock {
+                        println!("Stopping RtAps thread");
+                        break 'mainloop;
+                    }
+                    if let Some(newmeta) = meta.take() {
+                        // New metadata has arrived. This is always the first
+                        // thing to push. Only when it is read, we will start
+                        // pushing actual data.
+                        *last_result_lock = Some(RtApsComm::NewMeta(newmeta));
+                        break 'commscope;
+                    }
+
+                    if let Some(RtApsComm::NewMeta(_)) = *last_result_lock {
+                        // New metadata is not yet read by reading thread. It
+                        // basically means we are not yet ready to give actual
+                        // data back.
+                        break 'commscope;
+                    }
+                    // Move last_cps into mutex.
+                    if let Some(last_cps) = last_cps.take() {
+                        *last_result_lock = Some(RtApsComm::NewResult(last_cps));
+                    }
+                }
+            } // End of loop
+            println!("Ending RtAps thread");
+        });
+        assert!(!thread.is_finished());
+
+        Ok(RtAps { comm: last_result2 })
+    }
+    /// Get last computed value. When new stream metadata is
+    pub fn get_last(&self) -> Option<RtApsComm> {
+        let mut lck = self.comm.lock();
+        let res = lck.take();
+        if let Some(RtApsComm::CommStopThread) = res {
+            panic!("BUG: CommStopThread should never be set!")
+        }
+        return lck.take();
+    }
+}
+impl Drop for RtAps {
+    fn drop(&mut self) {
+        println!("DROP");
+        let mut lck = self.comm.lock();
+        *lck = Some(RtApsComm::CommStopThread);
+        println!("DROP done");
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use std::time::Duration;
+
+    use super::*;
+    use crate::daq::StreamMgr;
+    #[test]
+    fn test_rtaps1() -> Result<()> {
+        {
+            let mut smgr = StreamMgr::new();
+            let rtaps = RtAps::build(&mut smgr)?;
+            smgr.startDefaultInputStream()?;
+            thread::sleep(Duration::from_secs(2));
+        }
+        Ok(())
+    }
+}