StreamManager is new frontend to all DAQ.

lasp/device/lasp_daq.pyx

@@ -1,10 +1,10 @@
 cimport cython
+from ..lasp_common import AvType
 from .lasp_deviceinfo cimport DeviceInfo
 from .lasp_daqconfig cimport DaqConfiguration
 
 from cpython.ref cimport PyObject,Py_INCREF, Py_DECREF
 import numpy as np
-from ..lasp_common import AvType
 
 __all__ = ['Daq']
 

lasp/lasp_avstream.py

@@ -2,26 +2,50 @@
 """
 Author: J.A. de Jong
 
-Description: Read data from image stream and record sound at the same time
+Description: Controlling an audio stream in a different process.
 """
 #import cv2 as cv
 import multiprocessing as mp
-import signal
+import time, logging, signal
+import numpy as np
+from enum import unique, Enum, auto
+from dataclasses import dataclass
 from .lasp_multiprocessingpatch import apply_patch
 apply_patch()
 
 from .lasp_atomic import Atomic
 from .lasp_common import AvType
-from .device import (Daq, DeviceInfo, DaqConfiguration)
+from .device import (Daq, DeviceInfo, DaqConfiguration, DaqChannel)
-from threading import Thread, Lock
+from typing import List
-import numpy as np
-import time, logging
-from enum import unique, Enum, auto
 
 
-__all__ = ['AvStream']
+__all__ = ['StreamManager', 'ignoreSigInt']
+
+
+def ignoreSigInt():
+    """
+    Ignore sigint signal. Should be set on all processes to let the main
+    process control this signal.
+    """
+    signal.signal(signal.SIGINT, signal.SIG_IGN)
+
+@dataclass
+class StreamMetaData:
+    # Sample rate [Hz]
+    fs: float
+
+    # Input channels
+    in_ch: List[DaqChannel]
+
+    # Output channels
+    out_ch: List[DaqChannel]
+
+    # blocksize
+    blocksize: int
+
+    # The data type of input and output blocks.
+    dtype: np.dtype
 
-video_x, video_y = 640, 480
 
 @unique
 class StreamMsg(Enum):
@@ -30,17 +54,19 @@ class StreamMsg(Enum):
     """
     startStream = auto()
     stopStream = auto()
+    stopAllStreams = auto()
     getStreamMetaData = auto()
     endProcess = auto()
+    scanDaqDevices = auto()
 
     activateSiggen = auto()
     deactivateSiggen = auto()
 
-
     """
     Second part, status messages that are send back on all listeners
     """
     # "Normal messages"
+    deviceList = auto()
     streamStarted = auto()
     streamStopped = auto()
     streamMetaData = auto()
@@ -51,10 +77,83 @@ class StreamMsg(Enum):
     streamFatalError = auto()
 
 
+class AudioStream:
+    """
+    Audio stream.
+    """
+    def __init__(self, 
+                 avtype: AvType, 
+                 devices: list, 
+                 daqconfig: DaqConfiguration,
+                 processCallback: callable):
+        """
+        Initializes the audio stream and tries to start it.
+
+        avtype: AvType
+        devices: List of device information
+        daqconfig: DaqConfiguration to used to generate audio stream backend
+        processCallback: callback function that will be called from a different
+        thread, with arguments (AudioStream, in
+        """
+
+        self.running = Atomic(False)
+        self.aframectr = Atomic(0)
+        self.avtype = avtype
+        self.siggen_activated = Atomic(False)
+
+        api_devices = devices[daqconfig.api]
+        self.processCallback = processCallback
+
+        matching_devices = [
+            device for device in api_devices if 
+            device.name == daqconfig.device_name]
+
+        if len(matching_devices) == 0:
+            raise RuntimeError('Could not find device {daqconfig.device_name}')
+
+        # TODO: We pick te first one, what to do if we have multiple matches?
+        # Is that even possible?
+        device = matching_devices[0]
+
+        self.daq  = Daq(device, daqconfig)
+        en_in_ch = daqconfig.getEnabledInChannels(include_monitor=True)
+        en_out_ch = daqconfig.getEnabledOutChannels()
+
+        samplerate = self.daq.start(self.streamCallback)
+        self.streammetadata = StreamMetaData(
+            fs = samplerate,
+            in_ch = daqconfig.getEnabledInChannels(),
+            out_ch = daqconfig.getEnabledOutChannels(),
+            blocksize = self.daq.nFramesPerBlock,
+            dtype = self.daq.getNumpyDataType()
+        )
+
+
+    def streamCallback(self, indata, outdata, nframes):
+        """
+        This is called (from a separate thread) for each block
+        of audio data.
+        """
+        return self.processCallback(self, indata, outdata)
+
+    def stop(self):
+        """
+        Stop the DAQ stream. Should be called only once.
+        """
+        daq = self.daq
+        self.daq = None
+        self.running <<= False
+        daq.stop()
+
+        self.streammetadata = None
+
 
 class AvStreamProcess(mp.Process):
+    """
+    Different process on which all audio streams are running
+    """
 
-    def __init__(self, daqconfig: DaqConfiguration,
+    def __init__(self,
                  pipe, in_qlist, outq):
         """
 
@@ -62,13 +161,15 @@ class AvStreamProcess(mp.Process):
             device: DeviceInfo 
 
         """
-        self.daqconfig = daqconfig
         self.pipe = pipe
         self.in_qlist = in_qlist
         self.outq = outq
-        self.aframectr = 0
+
-        self.daq = None
+        self.devices = {}
-        self.streamdata = None
+        self.daqconfigs = None
+
+        # In, out, duplex
+        self.streams = {t: None for t in list(AvType)}
 
         super().__init__()
 
@@ -76,122 +177,175 @@ class AvStreamProcess(mp.Process):
         """
         The actual function running in a different process.
         """
+        # First things first, ignore interrupt signals
         # https://stackoverflow.com/questions/21104997/keyboard-interrupt-with-pythons-multiprocessing
         signal.signal(signal.SIGINT, signal.SIG_IGN)
 
+        # Check for devices
+        self.rescanDaqDevices()
         self.siggen_activated = Atomic(False)
-        self.running = Atomic(False)
-        self.aframectr = Atomic(0)
 
-        daqconfig = self.daqconfig
-        devices = Daq.getDeviceInfo()
-        api_devices = devices[daqconfig.api]
-
-        matching_devices = [
-            device for device in api_devices if device.name == daqconfig.device_name]
-
-        if len(matching_devices) == 0:
-            self.pipe.send((StreamMsg.streamFatalError, f"Device {daqconfig.device_name} not available"))
-
-        self.device = matching_devices[0]
-        # logging.debug(self.device)
-        # logging.debug(self.daqconfig)
         while True:
             msg, data = self.pipe.recv()
             logging.debug(f'Obtained message {msg}')
 
             if msg == StreamMsg.activateSiggen:
                 self.siggen_activated <<= True
+
             elif msg == StreamMsg.deactivateSiggen:
                 self.siggen_activated <<= False
 
+            elif msg == StreamMsg.scanDaqDevices:
+                self.rescanDaqDevices()
+
+            elif msg == StreamMsg.stopAllStreams:
+                self.stopAllStreams()
+
             elif msg == StreamMsg.endProcess:
-                if self.streamdata is not None and self.running:
+                self.stopAllStreams()
-                    logging.error('Process exit while stream is still running')
+                # and.. exit!
                 return
 
             elif msg == StreamMsg.getStreamMetaData:
-                self.pipe.send((StreamMsg.streamMetaData, self.streamdata))
+                avtype = data
-                for q in self.in_qlist:
+                stream = self.streams[avtype]
-                    q.put((StreamMsg.streamMetaData, self.streamdata))
+                if stream is not None:
+                    self.sendPipe(StreamMsg.streamMetaData, avtype, stream.streammetadata)
+                else:
+                    self.sendPipe(StreamMsg.streamMetaData, avtype, None)
 
             elif msg == StreamMsg.startStream:
-                self.startStream()
+                avtype, daqconfig = data
+                self.startStream(avtype, daqconfig)
+
             elif msg == StreamMsg.stopStream:
-                self.stopStream()
+                avtype, = data
+                self.stopStream(avtype)
+
+    def startStream(self, avtype: AvType, daqconfig: DaqConfiguration):
+        """
+        Start a stream, based on type and configuration
+
+        """
+        self.stopRequiredExistingStreams(avtype)
+        try:
+            stream = AudioStream(avtype,
+                              self.devices, 
+                              daqconfig, self.streamCallback)
+            self.streams[avtype] = stream
+
+        except Exception as e:
+            self.sendPipeAndAllQueues(StreamMsg.streamError, avtype, "Error starting stream {str(e)}")
+            return
+
+        self.sendPipeAndAllQueues(StreamMsg.streamStarted, avtype, stream.streammetadata)
+
+    def stopStream(self, avtype: AvType):
+        """
+        Stop an existing stream, and sets the attribute in the list of streams
+        to None
+
+        Args:
+            stream: AudioStream instance
+        """
+        stream = self.streams[avtype]
+        if stream is not None:
+            try:
+               stream.stop()
+               self.sendPipeAndAllQueues(StreamMsg.streamStopped, stream.avtype)
+            except Exception as e:
+                self.sendPipeAndAllQueues(StreamMsg.streamError, stream.avtype, "Error occured in stopping stream: {str(e)}")
+        self.streams[avtype] = None
+
+
+    def stopRequiredExistingStreams(self, avtype: AvType):
+        """
+        Stop all existing streams that conflict with the current avtype
+        """
+        if avtype == AvType.audio_input:
+            # For a new input, duplex and input needs to be stopped
+            stream_to_stop = (AvType.audio_input, AvType.audio_duplex)
+        elif avtype == AvType.audio_output:
+            # For a new output, duplex and output needs to be stopped
+            stream_to_stop = (AvType.audio_output, AvType.audio_duplex)
+        elif avtype == AvType.audio_duplex:
+            # All others have to stop
+            stream_to_stop = list(AvType) # All of them
+        else:
+            raise ValueError('BUG')
+
+        for stream in stream_to_stop:
+            if stream is not None:
+                self.stopStream(stream)
             
-    def startStream(self):
+    def stopAllStreams(self):
         """
-        Start the DAQ stream.
+        Stops all streams
         """
-        if self.daq is not None:
+        for key in self.streams.keys():
-            self.pipe.send((StreamMsg.streamError, 'Stream has already been started'))
+            self.stopStream(key)
+
+    def isStreamRunning(self, avtype: AvType = None):
+        """
+        Check whether a stream is running
+
+        Args:
+            avtype: The stream type to check whether it is still running. If
+            None, it checks all streams.
+
+        Returns:
+            True if a stream is running, otherwise false
+        """
+        if avtype is None:
+            avtype = list(AvType)
+        else:
+            avtype = (avtype,)
+        for t in avtype:
+            if self.streams[t] is not None:
+                return True
+
+        return False
+
+    def rescanDaqDevices(self):
+        """
+        Rescan the available DaQ devices.
+
+        """
+        if self.isStreamRunning():
+            self.sendPipe(StreamMsg.streamError, None, "A stream is running, cannot rescan DAQ devices.")
             return
 
-        try:
+        self.devices = Daq.getDeviceInfo()
-            self.daq  = Daq(self.device, 
+        self.sendPipe(StreamMsg.deviceList, self.devices)
-                             self.daqconfig)
+            
-            samplerate = self.daq.start(self.streamCallback)
+    def streamCallback(self, audiostream, indata, outdata):
-            streamdata = {
-                'blocksize': self.daq.nFramesPerBlock,
-                'samplerate': samplerate,
-                'dtype': self.daq.getNumpyDataType(),
-                }
-
-            self.streamdata = streamdata
-            self.pipe.send((StreamMsg.streamStarted, streamdata))
-            self.putAllInQueues(StreamMsg.streamStarted, streamdata)
-        except Exception as e:
-            logging.debug(f'Error starting stream: {e}')
-            self.daq = None
-            self.pipe.send((StreamMsg.streamError, str(e)))
-
-    def stopStream(self):
-        """
-        Stop the DAQ stream.
-        """
-
-        if self.daq is None:
-            self.pipe.send((StreamMsg.streamError, 'Stream is not running'))
-            return
-
-        try:
-            self.daq.stop()
-            self.running <<= False
-            self.streamdata = None
-            self.pipe.send((StreamMsg.streamStopped, None))
-            self.putAllInQueues(StreamMsg.streamStopped, None)
-        except Exception as e:
-            self.pipe.send((StreamMsg.streamError, f'Error stopping stream: {e}'))
-
-        self.streamdata
-        self.daq = None
-
-    def streamCallback(self, indata, outdata, nframes):
         """This is called (from a separate thread) for each audio block."""
         # logging.debug('streamCallback()')
-        self.aframectr += nframes
 
         if self.siggen_activated:
             # logging.debug('siggen_activated')
             if self.outq.empty():
                 outdata[:, :] = 0
                 msgtxt = 'Output signal buffer underflow'
-                self.pipe.send((StreamMsg.streamError, msgtxt))
+                self.sendPipeAndAllQueues(StreamMsg.streamError, 
-                self.putAllInQueues(StreamMsg.streamError, msgtxt)
+                                          audiostream.avtype, 
+                                          msgtxt)
             else:
                 newdata = self.outq.get()
                 if newdata.shape[0] != outdata.shape[0] or newdata.ndim != 1:
-                    self.pipe.send(StreamMsg.streamFatalError, 'Invalid output data obtained from queue')
+                    self.sendPipeAndAllQueues(StreamMsg.streamFatalError,
+                                              audiostream.avtype, 
+                                              'Invalid output data obtained from queue')
                     return 1
-                outdata[:, :] = newdata[:, np.newaxis]
+                outdata[:, :] = newdata[:, None]
 
         if indata is not None:
-            self.putAllInQueues(StreamMsg.streamData, indata)
+            self.putAllInQueues(StreamMsg.streamData, audiostream.avtype, 
+                                indata)
 
-        return 0 if self.running else 1
+        return 0
 
-    def putAllInQueues(self, msg, data):
+    def putAllInQueues(self, msg, *data):
         """
         Put a message and data on all input queues in the queue list
         """
@@ -199,51 +353,42 @@ class AvStreamProcess(mp.Process):
             # Fan out the input data to all queues in the queue list
             q.put((msg, data))
 
-def ignoreSigInt():
+    # Wrapper functions that safe some typing, they do not require an
-    signal.signal(signal.SIGINT, signal.SIG_IGN)
+    # explanation.
+    def sendPipe(self, msg, *data):
+        self.pipe.send((msg, data))
 
-class AvStream:
+    def sendPipeAndAllQueues(self, msg, *data):
-    """Audio and video data stream, to which callbacks can be adde
+        self.sendPipe(msg, *data)
-            daqconfig: DAQConfiguration instance. If duplex mode flag is set,
+        self.putAllInQueues(msg, *data)
-            please make sure that output_device is None, as in that case the
+
-            output config will be taken from the input device.
+
-            video:
+@dataclass
-        """
+class StreamStatus:
-    def __init__(self,
+    lastStatus: StreamMsg = StreamMsg.streamStopped
-                 avtype: AvType,
+    errorTxt: str = None
-                 daqconfig: DaqConfiguration,
+    streammetadata: StreamMetaData = None
-                 video=None):
+
+
+class StreamManager:
+    """
+    Audio and video data stream manager, to which queus can be added
+    """
+    def __init__(self):
         """Open a stream for audio in/output and video input. For audio output,
         by default all available channels are opened for outputting data.
 
-        Args:
-            device: DeviceInfo for the audio device
-            avtype: Type of stream. Input, output or duplex
-
-            daqconfig: DAQConfiguration instance. If duplex mode flag is set,
-            please make sure that output_device is None, as in that case the
-            output config will be taken from the input device.
-            video:
         """
 
-        self.avtype = avtype
+        # Initialize streamstatus
-
+        self.streamstatus = {t: StreamStatus() for t in list(AvType)}
-        en_in_ch = daqconfig.getEnabledInChannels(include_monitor=True)
-        en_out_ch = daqconfig.getEnabledOutChannels()
-
-        self.input_channel_names = [ch.channel_name for ch in en_in_ch]
-        self.output_channel_names = [ch.channel_name for ch in en_out_ch]
-
-        self.input_sensitivity = [ch.sensitivity for ch in en_in_ch]
-        self.input_sensitivity = np.asarray(self.input_sensitivity)
-        self.input_qtys = [ch.qty for ch in en_in_ch]
-
-        # Counters for the number of frames that have been coming in
-        self._vframectr = Atomic(0)
 
+        self.devices = None
 
         # Multiprocessing manager, pipe, output queue, input queue,
         self.manager = mp.managers.SyncManager()
+
+        # Start this manager and ignore interrupts
         # https://stackoverflow.com/questions/21104997/keyboard-interrupt-with-pythons-multiprocessing
         self.manager.start(ignoreSigInt)
 
@@ -260,40 +405,77 @@ class AvStream:
 
         # Messaging pipe
         self.pipe, child_pipe = mp.Pipe(duplex=True)
+
+        # Create the stream process
         self.streamProcess = AvStreamProcess(
-            daqconfig,
             child_pipe,
             self.in_qlist,
             self.outq)
         self.streamProcess.start()
 
-        # Possible, but long not tested: store video
+    def handleMessages(self):
-        # self._video = video
+        """
-        # self._video_started = Atomic(False)
-        self._videothread = None
 
-        self.daqconfig = daqconfig
+        Handle messages that are still on the pipe.
-        self.streammetadata = None
 
-    def getStreamMetaData(self):
+        """
-        return self.streammetadata
+        while self.pipe.poll():
+            msg, data = self.pipe.recv()
+            if msg == StreamMsg.streamStarted:
+                avtype, streammetadata = data
+                self.streamstatus[avtype].lastStatus = msg
+                self.streamstatus[avtype].errorTxt = None
+                self.streamstatus[avtype].streammetadata = streammetadata
+
+            elif msg == StreamMsg.streamStopped:
+                avtype,  = data
+                self.streamstatus[avtype].lastStatus = msg
+                self.streamstatus[avtype].errorTxt = None
+                self.streamstatus[avtype].streammetadata = None
+
+            elif msg == StreamMsg.streamError:
+                avtype, errorTxt = data
+                if avtype is not None:
+                    self.streamstatus[avtype].lastStatus = msg
+                    self.streamstatus[avtype].errorTxt = None
+
+            elif msg == StreamMsg.streamMetaData:
+                avtype, metadata = data
+                self.streamstatus[avtype].streammetadata = metadata
+
+            elif msg == StreamMsg.deviceList:
+                devices = data
+                self.devices = devices
+
+    def getDeviceList(self):
+        self.handleMessages()
+        return self.devices
+
+
+    def getStreamStatus(self, avtype: AvType):
+        """
+        Returns the current stream Status.
+        """
+        self.handleMessages()
+        return self.streamstatus[avtype]
 
     def getOutputQueue(self):
         """
         Returns the output queue object.
 
-        Note, should only be used by one signal generator at the time!
+        Note, should (of course) only be used by one signal generator at the time!
         """
         return self.outq
 
     def activateSiggen(self):
+        self.handleMessages()
         logging.debug('activateSiggen()')
-        self.pipe.send((StreamMsg.activateSiggen, None))
+        self.sendPipe(StreamMsg.activateSiggen, None)
 
     def deactivateSiggen(self):
+        self.handleMessages()
         logging.debug('activateSiggen()')
-        self.pipe.send((StreamMsg.deactivateSiggen, None))
+        self.sendPipe(StreamMsg.deactivateSiggen, None)
-
 
     def addListener(self):
         """
@@ -302,12 +484,18 @@ class AvStream:
         Returns:
             listener queue
         """
+        self.handleMessages()
         newqueue = self.manager.Queue()
         self.in_qlist.append(newqueue)
         self.in_qlist_local.append(newqueue)
         return newqueue
 
     def removeListener(self, queue):
+        """
+        Remove an input listener queue from the queue list.
+        """
+        # Uses a local queue list to find the index, based on the queue
+        self.handleMessages()
         idx = self.in_qlist_local.index(queue)
         del self.in_qlist[idx]
         del self.in_qlist_local[idx]
@@ -316,29 +504,22 @@ class AvStream:
         """Returns the current number of installed listeners."""
         return len(self.in_qlist)
 
-    def start(self):
+    def startStream(self, avtype: AvType, daqconfig: DaqConfiguration):
-        """Start the stream, which means the callbacks are called with stream
+        """
-        data (audio/video)"""
+        Start the stream, which means the callbacks are called with stream
-        logging.debug('Starting stream...')
+        data (audio/video)
-        self.pipe.send((StreamMsg.startStream, None))
-        msg, data = self.pipe.recv()
-        if msg == StreamMsg.streamStarted:
-            self.streammetadata = data
-            return data
-        elif msg == StreamMsg.streamError:
-            raise RuntimeError(data)
-        else:
-            raise RuntimeError('BUG: got unexpected message: {msg}')
 
-    def stop(self):
+        """
-        self.pipe.send((StreamMsg.stopStream, None))
+        logging.debug('Starting stream...')
-        msg, data = self.pipe.recv()
+        self.sendPipe(StreamMsg.startStream, avtype, daqconfig)
-        if msg == StreamMsg.streamStopped:
+        self.handleMessages()
-            return
+
-        elif msg == StreamMsg.streamError:
+    def stopStream(self, avtype: AvType):
-            raise RuntimeError(data)
+        self.handleMessages()
-        else:
+        self.sendPipe(StreamMsg.stopStream, avtype)
-            raise RuntimeError('BUG: got unexpected message: {msg}')
+
+    def stopAllStreams(self):
+        self.sendPipe(StreamMsg.stopAllStreams)
 
     def cleanup(self):
         """
@@ -349,7 +530,7 @@ class AvStream:
         Otherwise things will wait forever...
 
         """
-        self.pipe.send((StreamMsg.endProcess, None))
+        self.sendPipe(StreamMsg.endProcess, None)
         logging.debug('Joining stream process...')
         self.streamProcess.join()
         logging.debug('Joining stream process done')
@@ -360,47 +541,9 @@ class AvStream:
         """
         return False
 
-
+    def sendPipe(self, msg, *data):
-    def isRunning(self):
+        """
-        self.pipe.send((StreamMsg.getStreamMetaData, None))
+        Send a message with data over the control pipe
-        msg, data = self.pipe.recv()
+        """
-        if msg == StreamMsg.streamMetaData:
+        self.pipe.send((msg, data))
-            streamdata = data
-            return streamdata is not None
-
-        elif msg == StreamMsg.streamError:
-            raise RuntimeError(data)
-        else:
-            raise RuntimeError('BUG: got unexpected message: {msg}')
-
-
-#     def _videoThread(self):
-#         cap = cv.VideoCapture(self._video)
-#         if not cap.isOpened():
-#             cap.open()
-#         vframectr = 0
-#         loopctr = 0
-#         while self._running:
-#             ret, frame = cap.read()
-#             # print(frame.shape)
-#             if ret is True:
-#                 if vframectr == 0:
-#                     self._video_started <<= True
-#                 with self._callbacklock:
-#                     for cb in self._callbacks[AvType.video]:
-#                         cb(frame, vframectr)
-#                 vframectr += 1
-#                 self._vframectr += 1
-#             else:
-#                 loopctr += 1
-#                 if loopctr == 10:
-#                     print('Error: no video capture!')
-#             time.sleep(0.2)
-
-#         cap.release()
-#         print('stopped videothread')
-
-
-#     def hasVideo(self):
-#         return True if self._video is not None else False
 

lasp/lasp_common.py

@@ -11,6 +11,7 @@ from .wrappers import Window as wWindow
 from collections import namedtuple
 from dataclasses import dataclass
 from dataclasses_json import dataclass_json
+from enum import Enum, unique, auto
 
 """
 Common definitions used throughout the code.
@@ -43,11 +44,19 @@ U_REF = 5e-8 # 50 nano meter / s
 # hence this is the reference level as specified below.
 dBFS_REF = 0.5*2**0.5 # Which level would be -3.01 dBFS
 
-class AvType:
+@unique
+class AvType(Enum):
     """Specificying the type of data, for adding and removing callbacks from
     the stream."""
-    audio_input = 1
+    
-    audio_output = 2
+    # Input stream
+    audio_input = auto()
+
+    # Output stream
+    audio_output = auto()
+
+    # Both input as well as output
+    audio_duplex = auto()
     video = 4
 
 

lasp/lasp_record.py

@@ -8,7 +8,8 @@ import logging
 import os
 import time
 import h5py
-from .lasp_avstream import AvStream, AvType, StreamMsg
+from .lasp_avstream import StreamMsg, StreamManager
+from .lasp_common import AvType
 
 
 @dataclasses.dataclass
@@ -19,7 +20,7 @@ class RecordStatus:
 
 class Recording:
 
-    def __init__(self, fn: str, stream: AvStream,
+    def __init__(self, fn: str, streammgr: StreamManager,
                  rectime: float = None, wait: bool = True,
                  progressCallback=None):
         """

lasp/lasp_siggen.py

@@ -15,17 +15,16 @@ import numpy as np
 from .filter import PinkNoise
 from .lasp_octavefilter import SosOctaveFilterBank, SosThirdOctaveFilterBank
 from .filter import OctaveBankDesigner, PinkNoise, ThirdOctaveBankDesigner
-from .lasp_avstream import AvStream, AvType
+from .lasp_avstream import StreamManager, ignoreSigInt
 from .wrappers import Siggen as pyxSiggen, Equalizer
 from enum import Enum, unique, auto
 
-QUEUE_BUFFER_TIME = 0.3  # The amount of time used in the queues for buffering
+QUEUE_BUFFER_TIME = 0.5  # The amount of time used in the queues for buffering
 # of data, larger is more stable, but also enlarges latency
 
 __all__ = ["SignalType", "NoiseType", "SiggenMessage", "SiggenData", "Siggen"]
 
 
-
 class SignalType(Enum):
     Periodic = auto()
     Noise = auto()
@@ -39,7 +38,7 @@ class NoiseType(Enum):
     pink = "Pink noise"
 
     def __str__(self):
-        return self.value
+        return str(self.value)
 
     @staticmethod
     def fillComboBox(combo):
@@ -62,9 +61,11 @@ class SiggenMessage(Enum):
     Different messages that can be send to the signal generator over the pipe
     connection.
     """
-    stop = auto()  # Stop and quit the signal generator
+    endProcess = auto()  # Stop and quit the signal generator
     adjustVolume = auto()  # Adjust the volume
     newEqSettings = auto()  # Forward new equalizer settings
+    ready = auto() # Send out once, once the signal generator is ready with
+    # pre-generating data.
 
     # These messages are send back to the main thread over the pipe
     error = auto()
@@ -73,6 +74,9 @@ class SiggenMessage(Enum):
 
 @dataclasses.dataclass
 class SiggenData:
+    """
+    Metadata used to create a Signal Generator
+    """
     fs: float  # Sample rate [Hz]
 
     # Number of frames "samples" to send in one block
@@ -120,10 +124,13 @@ class SiggenProcess(mp.Process):
         )
         super().__init__()
 
-    def newSiggen(self, siggendata):
+    def newSiggen(self, siggendata: SiggenData):
         """
         Create a signal generator based on parameters specified in global
         function data.
+
+        Args:
+            siggendata: SiggenData. Metadata to create a new signal generator.
         """
         fs = siggendata.fs
         nframes_per_block = siggendata.nframes_per_block
@@ -192,23 +199,31 @@ class SiggenProcess(mp.Process):
         return eq
 
     def run(self):
-        # Initialization
+        # The main function of the actual process
+        # First things first
+        ignoreSigInt()
+
         try:
             self.siggen = self.newSiggen(self.siggendata)
+        except Exception as e:
+            self.pipe.send((SiggenMessage.error, str(e)))
+
+        try:
             self.eq = self.newEqualizer(self.siggendata.eqdata)
         except Exception as e:
             self.pipe.send((SiggenMessage.error, str(e)))
-            return 1
 
         # Pre-generate blocks of signal data
         while self.dataq.qsize() < self.nblocks_buffer:
             self.generate()
 
+        self.pipe.send((SiggenMessage.ready, None))
+
         while True:
             if self.pipe.poll(timeout=QUEUE_BUFFER_TIME / 2):
                 msg, data = self.pipe.recv()
-                if msg == SiggenMessage.stop:
+                if msg == SiggenMessage.endProcess:
-                    logging.debug("Signal generator caught 'stop' message. Exiting.")
+                    logging.debug("Signal generator caught 'endProcess' message. Exiting.")
                     return 0
                 elif msg == SiggenMessage.adjustVolume:
                     logging.debug(f"Signal generator caught 'adjustVolume' message. New volume = {level_dB:.1f} dB FS")
@@ -243,14 +258,27 @@ class Siggen:
 
         self.pipe, client_end = mp.Pipe(duplex=True)
 
+        self.stopped = False
+
         self.process = SiggenProcess(siggendata, dataq, client_end)
         self.process.start()
 
-        self.handle_msgs()
         if not self.process.is_alive():
             raise RuntimeError('Unexpected signal generator exception')
 
-        self.stopped = False
+        # Block waiting here for signal generator to be ready
+        msg, data = self.pipe.recv()
+        if msg == SiggenMessage.ready:
+            logging.debug('Signal generator ready')
+        elif msg == SiggenMessage.error:
+            e = data
+            raise RuntimeError('Signal generator exception: {str(e)}')
+        else:
+            # Done, or something
+            if msg == SiggenMessage.done:
+                self.stopped = True
+
+        self.handle_msgs()
 
     def setLevel(self, new_level):
         """
@@ -268,27 +296,16 @@ class Siggen:
         while self.pipe.poll():
             msg, data = self.pipe.recv()
             if msg == SiggenMessage.error:
-                self.stop()
                 raise RuntimeError(
                     f"Error in initialization of signal generator: {data}"
                 )
-            elif msg == SiggenMessage.ready:
+            # elif msg == SiggenMessage.done:
-                return
+            #     self.stop()
 
-            elif msg == SiggenMessage.done:
-                self.stop()
 
-    def start(self):
+    def cleanup(self):
-        if self.stopped:
-            raise RuntimeError('BUG: This Siggen object cannot be used again.')
-        
-        self.handle_msgs()
-
-    def stop(self):
         logging.debug('Siggen::stop()')
-        if self.stopped:
+        self.pipe.send((SiggenMessage.endProcess, None))
-            raise RuntimeError('BUG: Siggen::stop() is called twice!')
-        self.pipe.send((SiggenMessage.stop, None))
         self.pipe.close()
         
         logging.debug('Joining siggen process')
@@ -297,6 +314,4 @@ class Siggen:
         self.process.close()
 
         self.process = None
-        logging.debug('End Siggen::stop()')
-        self.stopped = True
 

scripts/lasp_siggen

@@ -5,7 +5,8 @@ import sys, logging, os, argparse
 logging.basicConfig(level=logging.DEBUG)
 import multiprocessing
 from lasp.lasp_multiprocessingpatch import apply_patch
-from lasp.lasp_avstream import AvStream, AvType
+from lasp.lasp_avstream import StreamManager
+from lasp.lasp_common import AvType
 from lasp.lasp_siggen import Siggen, SignalType, SiggenData
 from lasp.device import DaqConfigurations
 
@@ -36,41 +37,33 @@ if __name__ == '__main__':
 
 
     choosen_key = config_keys[daqindex]
-    config = configs[choosen_key].output_config
+    daqconfig = configs[choosen_key].output_config
 
     print(f'Choosen configuration: {choosen_key}')
 
-
-
     try:
+        streammgr = StreamManager()
+        outq = streammgr.getOutputQueue()
+
         siggendata = SiggenData(
             fs=48e3,
-            nframes_per_block=1024,
+            nframes_per_block=2048,
             dtype=np.dtype(np.int16),
             eqdata=None,
             level_dB=-20,
             signaltype=SignalType.Periodic,
             signaltypedata=(1000.,)
         )
-
-        stream = AvStream(
-            AvType.audio_output,
-            config)
-
-        outq = stream.getOutputQueue()
-        stream.activateSiggen()
         siggen = Siggen(outq, siggendata)
 
-        stream.start()
+        streammgr.activateSiggen()
+
+        streammgr.startStream(AvType.audio_output, daqconfig)
+
         input('Press any key to stop...')
-        stream.stop()
+        streammgr.stopStream(AvType.audio_output)
-        siggen.stop()
-
     finally:
-        try:
+        siggen.cleanup()
-            stream.cleanup()
+        streammgr.cleanup()
-            del stream
-        except NameError:
-            pass