How to install PyAudio? (L4T 32.2.3)

tmx3 · March 9, 2020, 6:04am

Need help to install PyAudio. I hope the underline problem is related to the issue of microphone setting that I posted earlier https://devtalk.nvidia.com/default/topic/1072949/jetson-nano/how-to-name-the-sound-hw-device-usb-microphone-l4t-32-2-3-/ so it could be solved all once if it turned out to be the case.

Supposedly it’s simple to install PyAudio. I ran the two commands as below,

sudo apt-get install portaudio19-dev python-all-dev python3-all-dev
pip install pyaudio

By the way, I have upgraded pip

pip --version
pip 20.0.2 from /home/tmx3/.local/lib/python3.6/site-packages/pip (python 3.6)

Then I tried to import and instantiate pyaudio, but failed.

tmx3@tmx3-jetboxnano1:~$ python3
Python 3.6.9 (default, Nov  7 2019, 10:44:02) 
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pyaudio
>>> pa = pyaudio.Pyaudio()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: module 'pyaudio' has no attribute 'Pyaudio'
>>> pa = pyaudio.PyAudio()
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.tegra-hda.pcm.front.0:CARD=0'
ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5007:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM front
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.tegra-hda.pcm.surround51.0:CARD=0'
ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5007:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM surround21
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.tegra-hda.pcm.surround51.0:CARD=0'
ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5007:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM surround21
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.tegra-hda.pcm.surround40.0:CARD=0'
ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5007:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM surround40
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.tegra-hda.pcm.surround51.0:CARD=0'
ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5007:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM surround41
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.tegra-hda.pcm.surround51.0:CARD=0'
ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5007:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM surround50
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.tegra-hda.pcm.surround51.0:CARD=0'
ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5007:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM surround51
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.tegra-hda.pcm.surround71.0:CARD=0'
ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5007:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM surround71
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.tegra-hda.pcm.iec958.0:CARD=0,AES0=4,AES1=130,AES2=0,AES3=2'
ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5007:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM iec958
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.tegra-hda.pcm.iec958.0:CARD=0,AES0=4,AES1=130,AES2=0,AES3=2'
ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5007:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM spdif
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.tegra-hda.pcm.iec958.0:CARD=0,AES0=4,AES1=130,AES2=0,AES3=2'
ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5007:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM spdif
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.modem
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.modem
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.phoneline
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.phoneline
ALSA lib pcm_dmix.c:990:(snd_pcm_dmix_open) The dmix plugin supports only playback stream
ALSA lib pcm_hw.c:1713:(_snd_pcm_hw_open) Invalid value for card
ALSA lib pcm_hw.c:1713:(_snd_pcm_hw_open) Invalid value for card
ALSA lib pcm_hw.c:1713:(_snd_pcm_hw_open) Invalid value for card
ALSA lib pcm_hw.c:1713:(_snd_pcm_hw_open) Invalid value for card
ALSA lib pcm_dmix.c:1052:(snd_pcm_dmix_open) unable to open slave
>>>

Any idea?

DaneLLL · March 10, 2020, 2:09am

Hi,
We don’t have experience of using PyAudio. Would need other users to share experience.

In general, we run gstreamer pipeline to do audio encoding/decoding on Jetson platforms. A reference post:
https://devtalk.nvidia.com/default/topic/1025376/jetson-tx2/video-and-audio-inputs-test-cmd/post/5215353/#5215353

tmx3 · March 10, 2020, 4:47am

Hi DaneLLL,
With your help on resolving the problem of “arecord” for microphone (for those who are interested, see the link in my post for details), I figured out how to run the PyAudio.

Well, it’s quite simple once knowing what to do. First, the error messages in my post are false alarm. Ignore them and keep going. Second, the real key is in the setting of opening the audio stream, which is related to the “arecord” issue as above.

I took the code from

mabdrabo/sound_recorder.py

https://gist.github.com/mabdrabo/8678538

And I set the channels to ‘2’ (I was wrong to set it to ‘1’ before), and added a parameter “input_device_index” to the open() methodfor pyaudio. In my case the index need to be ‘11’ for the USB Mic.

CHANNELS = 2
MIC_INDEX = 11

# start Recording
stream = audio.open(format=FORMAT, channels=CHANNELS, input_device_index=MIC_INDEX,
                rate=RATE, input=True,
                frames_per_buffer=CHUNK)

The rest are the same as in mabdrabo’s sound_recorder.py
I tested and worked.

Cheers!

tmx3 · March 10, 2020, 5:02am

Let me post the adopted code here for reference. By the way, like always, assume you have installed pyaudio and dependencies successfully.

# Source: mabdrabo/sound_recorder.py
# https://gist.github.com/mabdrabo/8678538
import pyaudio
import wave
 
FORMAT = pyaudio.paInt16
CHANNELS = 2
RATE = 16000
CHUNK = 1024
RECORD_SECONDS = 5
WAVE_OUTPUT_FILENAME = "pytest.wav"
MIC_INDEX = 11
 
audio = pyaudio.PyAudio()
 
# start Recording
stream = audio.open(format=FORMAT, channels=CHANNELS, input_device_index=MIC_INDEX,
                rate=RATE, input=True,
                frames_per_buffer=CHUNK)
print ("recording...")
frames = []
 
for i in range(0, int(RATE / CHUNK * RECORD_SECONDS)):
    data = stream.read(CHUNK, exception_on_overflow = False)
    frames.append(data)
print ("finished recording")

# stop Recording
stream.stop_stream()
stream.close()
audio.terminate()
 
waveFile = wave.open(WAVE_OUTPUT_FILENAME, 'wb')
waveFile.setnchannels(CHANNELS)
waveFile.setsampwidth(audio.get_sample_size(FORMAT))
waveFile.setframerate(RATE)
waveFile.writeframes(b''.join(frames))
waveFile.close()

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How to install PyAudio? (L4T 32.2.3)

mabdrabo/sound_recorder.py

https://gist.github.com/mabdrabo/8678538

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