ASCEE/lasp
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Output data for device now directly written to buffer. Bugfix in interleaved/deinterleaved creation of Numpy array from data

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This commit is contained in:
Anne de Jong 2019-12-26 16:04:49 +01:00
parent 705f77858d
commit dcb861a6ef
4 changed files with 103 additions and 41 deletions
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55
lasp/device/lasp_rtaudio.pyx
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@ -26,7 +26,7 @@ cdef extern from "RtAudio.h" nogil:
THREAD_ERROR
ctypedef unsigned long RtAudioStreamFlags
RtAudioStreamFlags RT_AUDIO_NONINTERLEAVED
RtAudioStreamFlags RTAUDIO_NONINTERLEAVED
RtAudioStreamFlags RTAUDIO_MINIMIZE_LATENCY
RtAudioStreamFlags RTAUDIO_HOG_DEVICE
RtAudioStreamFlags RTAUDIO_ALSA_USE_DEFAULT
@ -144,10 +144,12 @@ cdef object fromBufferToNPYNoCopy(
void* buf,
size_t nchannels,
size_t nframes):
cdef cnp.npy_intp[2] dims = [nchannels, nframes]
cdef cnp.npy_intp[2] dims = [nframes, nchannels]
# Interleaved data is C-style contiguous. Therefore, we can directly use
# SimpleNewFromData()
array = cnp.PyArray_SimpleNewFromData(2, &dims[0], buffer_format_type,
buf).transpose()
buf)
return array
@ -160,8 +162,8 @@ cdef void fromNPYToBuffer(cnp.ndarray arr,
memcpy(buf, arr.data, arr.size*arr.itemsize)
cdef int audioCallback(void* outputBuffer,
void* inputBuffer,
cdef int audioCallback(void* outputbuffer,
void* inputbuffer,
unsigned int nFrames,
double streamTime,
RtAudioStreamStatus status,
@ -185,41 +187,42 @@ cdef int audioCallback(void* outputBuffer,
# Obtain stream information
npy_input = None
npy_output = None
if stream.hasInput:
try:
assert inputBuffer != NULL
assert inputbuffer != NULL
npy_format = _formats_rtkey[stream.sampleformat][2]
npy_input = fromBufferToNPYNoCopy(
npy_format,
inputBuffer,
inputbuffer,
stream.inputParams.nChannels,
nFrames)
except Exception as e:
print('Exception in Cython callback: ', str(e))
print('exception in cython callback: ', str(e))
if stream.hasOutput:
try:
assert outputbuffer != NULL
npy_format = _formats_rtkey[stream.sampleformat][2]
npy_output = fromBufferToNPYNoCopy(
npy_format,
outputbuffer,
stream.outputParams.nChannels,
nFrames)
except Exception as e:
print('exception in cython callback: ', str(e))
try:
npy_output, rval = stream.pyCallback(npy_input,
nFrames,
streamTime)
rval = stream.pyCallback(npy_input,
npy_output,
nFrames,
streamTime)
except Exception as e:
print('Exception in Python callback: ', str(e))
return 1
if stream.hasOutput:
if npy_output is None:
print('No output buffer given!')
return 1
IF LASP_DEBUG_CYTHON:
try:
assert outputBuffer != NULL, "Bug: RtAudio does not give output buffer!"
assert npy_output.shape[0] == stream.outputParams.nChannels, "Bug: channel mismatch in output buffer!"
assert npy_output.shape[1] == nFrames, "Bug: frame mismatch in output buffer!"
assert npy_output.itemsize == stream.sampleSize, "Bug: invalid sample type in output buffer!"
except AssertionError as e:
print(e)
fromNPYToBuffer(npy_output, outputBuffer)
return rval
return rval
cdef void errorCallback(RtAudioError.Type _type,const string& errortxt) nogil:
pass

12
lasp/lasp_avstream.py
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@ -67,7 +67,8 @@ class AvStream:
if daqconfig.duplex_mode or avtype == AvType.audio_output:
rtaudio_outputparams = {'deviceid': device.index,
'nchannels': device.outputchannels,
# TODO: Add option to specify the number of output channels to use
'nchannels': 1, #device.outputchannels,
'firstchannel': 0}
self.sampleformat = daqconfig.en_output_sample_format
self.samplerate = int(daqconfig.en_output_rate)
@ -191,24 +192,23 @@ class AvStream:
cap.release()
print('stopped videothread')
def _audioCallback(self, indata, nframes, streamtime):
def _audioCallback(self, indata, outdata, nframes, streamtime):
"""
This is called (from a separate thread) for each audio block.
"""
self._aframectr += 1
output_signal = None
with self._callbacklock:
for cb in self._callbacks[AvType.audio_input]:
try:
cb(indata, self._aframectr())
cb(indata, outdata, self._aframectr())
except Exception as e:
print(e)
for cb in self._callbacks[AvType.audio_output]:
try:
output_signal = cb(indata, self._aframectr())
cb(indata, outdata, self._aframectr())
except Exception as e:
print(e)
return output_signal, 0 if self._running else 1
return 0 if self._running else 1
def stop(self):
self._running <<= False

11
lasp/lasp_record.py
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@ -131,7 +131,7 @@ class Recording:
def _aCallback(self, frames, aframe):
def _aCallback(self, indata, outdata, aframe):
curT = self._aframeno()*self.blocksize/self.samplerate
recstatus = RecordStatus(
@ -158,7 +158,7 @@ class Recording:
return
self._ad.resize(self._aframeno()+1, axis=0)
self._ad[self._aframeno(), :, :] = frames
self._ad[self._aframeno(), :, :] = indata
self._aframeno += 1
def _vCallback(self, frame, framectr):
@ -168,10 +168,3 @@ class Recording:
self._vd[vframeno, :, :] = frame
self._vframeno += 1
if __name__ == '__main__':
stream = AvStream()
rec = Recording('test', stream, 5)
with rec(wait=True):
sleep
rec.start()

66
scripts/lasp_siggen Executable file
View File

@ -0,0 +1,66 @@
#!/usr/bin/python3
import argparse
import numpy as np
parser = argparse.ArgumentParser(
description='Play a sine wave'
)
device_help = 'DAQ Device to play to'
parser.add_argument('--device', '-d', help=device_help, type=str,
default='Default')
args = parser.parse_args()
from lasp.lasp_avstream import AvStream, AvType
from lasp.device import DAQConfiguration, RtAudio
config = DAQConfiguration.loadConfigs()[args.device]
rtaudio = RtAudio()
count = rtaudio.getDeviceCount()
devices = [rtaudio.getDeviceInfo(i) for i in range(count)]
output_devices = {}
for device in devices:
if device.outputchannels >= 0:
output_devices[device.name] = device
try:
output_device = output_devices[config.output_device_name]
except KeyError:
raise RuntimeError(f'output device {config.output_device_name} not available')
samplerate = int(config.en_output_rate)
stream = AvStream(output_device,
AvType.audio_output,
config)
# freq = 440.
freq = 1000.
omg = 2*np.pi*freq
def mycallback(indata, outdata, blockctr):
frames = outdata.shape[0]
nchannels = outdata.shape[1]
# nchannels = 1
streamtime = blockctr*frames/samplerate
t = np.linspace(streamtime, streamtime + frames/samplerate,
frames)[np.newaxis, :]
outp = 0.01*np.sin(omg*t)
for i in range(nchannels):
outdata[:,i] = ((2**16-1)*outp).astype(np.int16)
stream.addCallback(mycallback, AvType.audio_output)
stream.start()
input()
print('Stopping stream...')
stream.stop()
print('Stream stopped')
print('Closing stream...')
stream.close()
print('Stream closed')