我正在运行以下 Python 脚本./test.py：
#!/usr/bin/python3
import snowboydecoder
import sys
import signal
import speech_recognition as sr
import cec
import os
"""
This demo file shows you how to use the new_message_callback to interact with
the recorded audio after a keyword is spoken. It uses the speech recognition
library in order to convert the recorded audio into text.
Information on installing the speech recognition library can be found at:
https://pypi.python.org/pypi/SpeechRecognition/
"""
interrupted = False
def audioRecorderCallback(fname):
print("converting audio to text")
r = sr.Recognizer()
f = open("key.json")
key = f.read()
f.close()
with sr.AudioFile(fname) as source:
audio = r.record(source) # read the entire audio file
# recognize speech using Google Speech Recognition
try:
print(r.recognize_google_cloud(audio, key, "hu-HU"))
except sr.UnknownValueError:
print("Google Speech Recognition could not understand audio")
except sr.RequestError as e:
print("Could not request results from Google Speech Recognition service; {0}".format(e))
os.remove(fname)
def detectedCallback():
print('recording audio...', end='', flush=True)
def signal_handler(signal, frame):
global interrupted
interrupted = True
def interrupt_callback():
global interrupted
return interrupted
if len(sys.argv) == 1:
print("Unspecified model, defaulting to snowboy.umdl")
print("Usage: test.py your.model")
model = "/mnt/samba/shared/snowboy/snowboy.umdl"
else:
model = sys.argv[1]
cec.init()
cec_devices = cec.list_devices()
# capture SIGINT signal, e.g., Ctrl+C
signal.signal(signal.SIGINT, signal_handler)
detector = snowboydecoder.HotwordDetector(model, sensitivity=0.7, audio_gain=1)
print('Listening... Press Ctrl+C to exit')
# main loop
detector.start(detected_callback=detectedCallback,
audio_recorder_callback=audioRecorderCallback,
silent_count_threshold=4,
recording_timeout=10,
interrupt_check=interrupt_callback,
sleep_time=0.01)
detector.terminate()
输出基本符合我的预期；如下所示的项目[[[是我的评论]]]：
Unspecified model, defaulting to snowboy.umdl
Usage: test.py your.model
Listening... Press Ctrl+C to exit
Expression 'alsa_snd_pcm_hw_params_set_period_size_near( pcm, hwParams, &alsaPeriodFrames, &dir )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 924
Expression 'alsa_snd_pcm_hw_params_set_period_size_near( pcm, hwParams, &alsaPeriodFrames, &dir )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 924
Expression 'alsa_snd_pcm_hw_params_set_period_size_near( pcm, hwParams, &alsaPeriodFrames, &dir )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 924
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.bcm2835_hdmi.pcm.front.0:CARD=0'
ALSA lib conf.c:4568:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5047:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM front
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.bcm2835_hdmi.pcm.surround51.0:CARD=0'
ALSA lib conf.c:4568:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5047:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM surround21
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.bcm2835_hdmi.pcm.surround51.0:CARD=0'
ALSA lib conf.c:4568:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5047:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM surround21
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.bcm2835_hdmi.pcm.surround40.0:CARD=0'
ALSA lib conf.c:4568:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5047:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM surround40
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.bcm2835_hdmi.pcm.surround51.0:CARD=0'
ALSA lib conf.c:4568:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5047:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM surround41
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.bcm2835_hdmi.pcm.surround51.0:CARD=0'
ALSA lib conf.c:4568:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5047:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM surround50
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.bcm2835_hdmi.pcm.surround51.0:CARD=0'
ALSA lib conf.c:4568:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5047:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM surround51
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.bcm2835_hdmi.pcm.surround71.0:CARD=0'
ALSA lib conf.c:4568:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5047:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM surround71
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.bcm2835_hdmi.pcm.iec958.0:CARD=0,AES0=4,AES1=130,AES2=0,AES3=2'
ALSA lib conf.c:4568:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5047:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM iec958
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.bcm2835_hdmi.pcm.iec958.0:CARD=0,AES0=4,AES1=130,AES2=0,AES3=2'
ALSA lib conf.c:4568:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5047:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM spdif
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.bcm2835_hdmi.pcm.iec958.0:CARD=0,AES0=4,AES1=130,AES2=0,AES3=2'
ALSA lib conf.c:4568:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5047:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM spdif
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.hdmi
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.hdmi
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.modem
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.modem
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.phoneline
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.phoneline
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
[[[Program waits here for verbal input]]]
INFO:snowboy:Keyword 1 detected at time: 2020-12-02 12:09:45
recording audio...converting audio to text
[[[Likely unrelated googleapi timeout error]]]
但是，当我使用以下命令将脚本转换为 systemd 脚本时/etc/systemd/system/test.service：
[Unit]
Description=Super user test service
After=sound.target network.target
Requires=sound.target
Wants=network.target
StartLimitIntervalSec=0
[Service]
Type=simple
Restart=always
RestartSec=1
User=pi
WorkingDirectory=/home/pi/snowboy
ExecStart=/mnt/samba/shared/snowboy/test.py
[Install]
WantedBy=multi-user.target
我得到了一个莫名其妙的不同的输出journalctl -u test.service -f
Dec 02 12:00:59 ARPI systemd[1]: Started Super user test service.
Dec 02 12:01:08 ARPI test.py[25846]: Expression 'alsa_snd_pcm_hw_params_set_period_size_near( pcm, hwParams, &alsaPeriodFrames, &dir )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 924
[[[Identical ALSA lib messages]]]
Dec 02 12:01:08 ARPI test.py[25846]: JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
[[[Program waits here for verbal input]]]
Dec 02 12:04:47 ARPI test.py[25846]: INFO:snowboy:Keyword 1 detected at time: 2020-12-02 12:04:47
Dec 02 12:04:47 ARPI test.py[25846]: Unspecified model, defaulting to snowboy.umdl
Dec 02 12:04:47 ARPI test.py[25846]: Usage: test.py your.model
Dec 02 12:04:47 ARPI test.py[25846]: Listening... Press Ctrl+C to exit
Dec 02 12:05:49 ARPI test.py[25846]: recording audio...WARNING:googleapiclient.http:Sleeping 1.39 seconds before retry 1 of 1 for request: GET https://www.googleapis.com/discovery/v1/apis/speech/v1/rest, after timed out
Dec 02 12:06:51 ARPI test.py[25846]: converting audio to text
[[[Likely unrelated googleapi timeout error]]]
Dec 02 12:06:51 ARPI systemd[1]: test.service: Main process exited, code=exited, status=1/FAILURE
Dec 02 12:06:51 ARPI systemd[1]: test.service: Failed with result 'exit-code'.
Dec 02 12:06:52 ARPI systemd[1]: test.service: Service RestartSec=1s expired, scheduling restart.
Dec 02 12:06:52 ARPI systemd[1]: test.service: Scheduled restart job, restart counter is at 2.
Dec 02 12:06:52 ARPI systemd[1]: Stopped Super user test service.
我尝试sudo journalctl --sync在服务等待输入时进行操作，但我预期的行（未指定模型、监听、等等……）没有出现在日志中。
答案1
我发现这篇文章关于journald，指出缓冲可能存在问题。
它引导我这个特定于 Python 的 Unix StackExchange 问题并给出解决方案。
在 systemd 服务文件中添加Environment="PYTHONUNBUFFERED=1"以下内容解决了该问题。[Service]