python - Pocketsphinx + Gstreamer 竞赛条件？ Pocketsphinx无法在Python脚本中同时收听音频+录音？

Question

概述:这是我上一个问题 ( here ) 的后续问题。我将很快发布完整的答案。我可以让 pocketsphinx 通过 Gstreamer 在 Python 中识别来自 PS3 Eye 的音频输入。通过指定正确的 alsa 设备(在我的例子中为 hw:1 )。

问题:我的下一个问题似乎涉及一个微小的竞争条件，涉及我的麦克风已在使用中并且需要能够录制某些内容。

想象一下以下情况:

1. 我启动了我的 python 守护进程，它当前正在监听。
2. 我对着麦克风说“Hello Scarlett”(Pocketsphinx 匹配关键字并开始记录所有输入)
3. 音频将被录制到/tmp/目录中的 wav 文件中，并且应该保留在那里直到检测到静音

现在看来，当我开始第 3 步时，麦克风再次停止工作。我运行了一些详细的选项来尝试弄清楚发生了什么，但检查我的/tmp/目录告诉我一切:

pi@scarlettpi ~ $ ls -lta /tmp/ | grep wav
-rw-r--r--   1 pi    pi       0 Aug 13 20:57 fsdgjdspi.wav
pi@scarlettpi ~ $

文件大小为 0 字节。没有记录任何内容。

为了确认我通过 strace 运行了该过程并确认了我的怀疑:

pi@scarlettpi ~ $ strace -p 12416 | tee -a pi.strace.log 2>&1
Process 12416 attached - interrupt to quit
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, -1) = 1 ([{fd=3, revents=POLLIN}])
read(3, "\1\0\0\0\0\0\0\0", 16)         = 8
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, -1) = 1 ([{fd=3, revents=POLLIN}])
read(3, "\1\0\0\0\0\0\0\0", 16)         = 8
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, -1) = 1 ([{fd=3, revents=POLLIN}])
read(3, "\1\0\0\0\0\0\0\0", 16)         = 8
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, -1) = 1 ([{fd=3, revents=POLLIN}])
read(3, "\1\0\0\0\0\0\0\0", 16)         = 8
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, -1) = 1 ([{fd=3, revents=POLLIN}])
read(3, "\1\0\0\0\0\0\0\0", 16)         = 8
ioctl(7, 0x80044121, 0xbebd764c)        = 0
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
futex(0x1e47f34, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1e47f30, {FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1}) = 1
futex(0x1e45218, FUTEX_WAKE_PRIVATE, 1) = 1
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
ioctl(7, 0x80044121, 0xbebd764c)        = 0
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
gettimeofday({1376379565, 54761}, NULL) = 0
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
open("/usr/local/lib/python2.7/dist-packages/pi-0.1.0-py2.7.egg/static/sounds/pi-listening.wav", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
open("/usr/local/lib/python2.7/dist-packages/pi-0.1.0-py2.7.egg/static/sounds/pi-listening.wav", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
lstat64("/tmp/tmpkTS2Fwpi.wav", 0xbebd73a0) = -1 ENOENT (No such file or directory)
socketpair(PF_FILE, SOCK_STREAM, 0, [19, 20]) = 0
fcntl64(19, F_SETFL, O_RDONLY|O_NONBLOCK) = 0
fcntl64(20, F_SETFL, O_RDONLY|O_NONBLOCK) = 0
brk(0x1f20000)                          = 0x1f20000
socketpair(PF_FILE, SOCK_STREAM, 0, [21, 22]) = 0
fcntl64(21, F_SETFL, O_RDONLY|O_NONBLOCK) = 0
fcntl64(22, F_SETFL, O_RDONLY|O_NONBLOCK) = 0
write(1, "Bossjones Note: Technically we'r"..., 97) = 97
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
stat64("/usr/share/alsa/alsa.conf", {st_mode=S_IFREG|0644, st_size=9184, ...}) = 0
open("/dev/snd/controlC1", O_RDONLY|O_CLOEXEC) = 23
fcntl64(23, F_SETFD, FD_CLOEXEC)        = 0
ioctl(23, UI_DEV_CREATE, 0xbebd6dd4)    = 0
close(23)                               = 0
open("/dev/snd/controlC1", O_RDWR|O_CLOEXEC) = 23
fcntl64(23, F_SETFD, FD_CLOEXEC)        = 0
ioctl(23, USBDEVFS_CONTROL or USBDEVFS_CONTROL32, 0xbebd6f74) = 0
ioctl(23, 0x40045532, 0xbebd6fac)       = 0
open("/dev/snd/pcmC1D0c", O_RDWR|O_NONBLOCK|O_CLOEXEC) = -1 EBUSY (Device or resource busy)
close(23)                               = 0
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
open("/tmp/tmpkTS2Fwpi.wav", O_WRONLY|O_CREAT|O_TRUNC|O_LARGEFILE, 0666) = 23
fstat64(23, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb6f6f000
_llseek(23, 0, [0], SEEK_SET)           = 0
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
stat64("/usr/share/alsa/alsa.conf", {st_mode=S_IFREG|0644, st_size=9184, ...}) = 0
open("/dev/snd/controlC1", O_RDONLY|O_CLOEXEC) = 24
fcntl64(24, F_SETFD, FD_CLOEXEC)        = 0
ioctl(24, UI_DEV_CREATE, 0xbebd6dd4)    = 0
close(24)                               = 0
open("/dev/snd/controlC1", O_RDWR|O_CLOEXEC) = 24
fcntl64(24, F_SETFD, FD_CLOEXEC)        = 0
ioctl(24, USBDEVFS_CONTROL or USBDEVFS_CONTROL32, 0xbebd6f74) = 0
ioctl(24, 0x40045532, 0xbebd6fac)       = 0
open("/dev/snd/pcmC1D0c", O_RDWR|O_NONBLOCK|O_CLOEXEC) = -1 EBUSY (Device or resource busy)
close(24)                               = 0
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(1, " * Listening closely...\n", 24) = 24
clock_gettime(CLOCK_MONOTONIC, {355220, 267713756}) = 0
clock_gettime(CLOCK_MONOTONIC, {355220, 268557726}) = 0
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=3, revents=POLLIN}])
read(3, "-\0\0\0\0\0\0\0", 16)          = 8
clock_gettime(CLOCK_MONOTONIC, {355220, 273415554}) = 0
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 0 (Timeout)
read(3, 0xbebd828c, 16)                 = -1 EAGAIN (Resource temporarily unavailable)
clock_gettime(CLOCK_MONOTONIC, {355220, 277294417}) = 0
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 0 (Timeout)
clock_gettime(CLOCK_MONOTONIC, {355220, 280380308}) = 0
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 0 (Timeout)
clock_gettime(CLOCK_MONOTONIC, {355220, 282305240}) = 0
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 0 (Timeout)
clock_gettime(CLOCK_MONOTONIC, {355220, 284684156}) = 0
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 0 (Timeout)
clock_gettime(CLOCK_MONOTONIC, {355220, 286915077}) = 0
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 0 (Timeout)
clock_gettime(CLOCK_MONOTONIC, {355220, 290111964}) = 0
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 0 (Timeout)
clock_gettime(CLOCK_MONOTONIC, {355220, 291641910}) = 0
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 0 (Timeout)
clock_gettime(CLOCK_MONOTONIC, {355220, 293437847}) = 0
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 0 (Timeout)
clock_gettime(CLOCK_MONOTONIC, {355220, 295553772}) = 0
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, 10705) = 0 (Timeout)
clock_gettime(CLOCK_MONOTONIC, {355231, 13213798}) = 0
write(1, " # cancel False False\n", 22) = 22
write(1, " * Not a word in the past 10 sec"..., 49) = 49
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
close(23)                               = 0
munmap(0xb6f6f000, 4096)                = 0
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
gettimeofday({1376379576, 186258}, NULL) = 0
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
open("/usr/local/lib/python2.7/dist-packages/pi-0.1.0-py2.7.egg/static/sounds/pi-cancel.wav", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
open("/usr/local/lib/python2.7/dist-packages/pi-0.1.0-py2.7.egg/static/sounds/pi-cancel.wav", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
ioctl(7, 0x80044121, 0xbebd7ac4)        = -1 EPIPE (Broken pipe)
futex(0xe78524, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0xe78520, {FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1}) = 1
futex(0xe78500, FUTEX_WAKE_PRIVATE, 1)  = 1
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
futex(0x1b82fec, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1b82fe8, {FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1}) = 1
futex(0x1ac5618, FUTEX_WAKE_PRIVATE, 1) = 1
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
write(3, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=3, revents=POLLIN}])
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=3, revents=POLLIN}])
read(3, "*\0\0\0\0\0\0\0", 16)          = 8
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 0 (Timeout)
read(3, 0xbebd828c, 16)                 = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 0 (Timeout)
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 0 (Timeout)
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 0 (Timeout)
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 0 (Timeout)
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 0 (Timeout)
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 0 (Timeout)
poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN}], 2, -1^C <unfinished ...>
Process 12416 detached

问题:我该怎么做才能使这项工作成功？

这是 python 代码。

Listener.py:

import pi
from pi.becore import ScarlettConfig
from recorder import Recorder
from brain import Brain

import os
import json
import tempfile
#import sys

import pygtk
pygtk.require('2.0')
import gtk
import gobject
import pygst
pygst.require('0.10')
gobject.threads_init()
import gst

scarlett_config=ScarlettConfig()

class Listener:
  def __init__(self, gobject, gst):
    self.failed = 0

    self.pipeline = gst.parse_launch(' ! '.join(['alsasrc device=' + scarlett_config.gimmie('audio_input_device'),
                                               'queue',
                                               'audioconvert',
                                               'audioresample',
                                               'queue',
                                               'vader name=vader auto-threshold=true',
                                               'pocketsphinx lm=' + scarlett_config.gimmie('LM') + ' dict=' + scarlett_config.gimmie('DICT') + ' hmm=' + scarlett_config.gimmie('HMM') + ' name=listener',
                                               'fakesink dump=1']))
    listener = self.pipeline.get_by_name('listener')
    listener.connect('result', self.__result__)
    listener.set_property('configured', True)
    print "KEYWORDS WE'RE LOOKING FOR: " + scarlett_config.gimmie('ourkeywords')

    bus = self.pipeline.get_bus()
    bus.add_signal_watch()
    bus.connect('message::application', self.__application_message__)
    self.pipeline.set_state(gst.STATE_PLAYING)

  def result(self, hyp, uttid):
    if hyp in scarlett_config.gimmie('ourkeywords'):
      self.failed = 0
      self.listen()
    else:
      self.failed += 1
      if self.failed > 4:
        pi.speak("" + scarlett_config.gimmie('scarlett_owner') + ", if you need me, just say my name.")
        self.failed = 0

  def listen(self):
    self.pipeline.set_state(gst.STATE_PAUSED)
    pi.play('pi-listening')
    Recorder(self)

  def cancel_listening(self):
    pi.play('pi-cancel')
    self.pipeline.set_state(gst.STATE_PLAYING)

###[ ........MUSIC SUFF HERE........ ]

  def __result__(self, listener, text, uttid):
    struct = gst.Structure('result')
    struct.set_value('hyp', text)
    struct.set_value('uttid', uttid)
    listener.post_message(gst.message_new_application(listener, struct))

  def __application_message__(self, bus, msg):
    msgtype =  msg.structure.get_name()
    if msgtype == 'result':
      self.result(msg.structure['hyp'], msg.structure['uttid'])

这是记录器.py:

import pi
from pi.becore import ScarlettConfig

import os
import tempfile

import pygtk
pygtk.require('2.0')
import gtk
import gobject
import pygst
pygst.require('0.10')
gobject.threads_init()
import gst

scarlett_config=ScarlettConfig()

class Recorder:
  def __init__(self, listener):
    self.listener = listener
    self.started = False
    self.finished = False
    self.recording = tempfile.mktemp(suffix='pi.wav')

    self.pipeline = gst.parse_launch(' ! '.join(['alsasrc device=' + scarlett_config.gimmie('audio_input_device'),
                                                 'queue',
                                                 'audioconvert',
                                                 'queue',
                                                 'audioresample',
                                                 'queue',
                                                 'vader name=vader auto-threshold=false',
                                                 'fakesink dump=1']))

    print "Bossjones Note: What is the current PIPLINE state BEFORE we're recording" + self.pipeline.get_state()

    self.recorder = gst.parse_launch(' ! '.join(['alsasrc device=' + scarlett_config.gimmie('audio_input_device'),
                                                 'queue',
                                                 'audioconvert',
                                                 'audioresample',
                                                 'audio/x-raw-int,rate=16000,width=16,channels=1,endianness=(int)1234',
                                                 'wavenc',
                                                 'filesink location=' + self.recording]))

    print "Bossjones Note: Technically we're suppose to be recording to this location: " + self.recording
    vader = self.pipeline.get_by_name('vader')
    vader.connect('vader_start', self.__start__)
    vader.connect('vader_stop', self.__stop__)

    bus = self.pipeline.get_bus()
    bus.add_signal_watch()
    bus.connect('message::application', self.__application_message__)
    self.pipeline.set_state(gst.STATE_PLAYING)
    self.recorder.set_state(gst.STATE_PLAYING)

    print " * Listening closely..."
    gobject.timeout_add_seconds(10, self.cancel)

  def start(self):
    self.started = True
    print " * Recording..."

  def stop(self):
    print " * (silence)"
    gobject.timeout_add_seconds(1, self.stop_now)

  def stop_now(self):
    print " # stop_now"
    if self.finished == True:
      self.listener.cancel_listening()
      return

    self.finished = True
    print " * Stored recording to ", self.recording
    self.pipeline.set_state(gst.STATE_NULL)
    self.recorder.set_state(gst.STATE_NULL)

    print " * Converting to FLAC..."
    os.system("ffmpeg -i %s -y %s" % (self.recording, self.recording))
    #os.unlink(self.recording)
    os.system("sox %s %s.final.wav noisered %s/static/noise.prof 0.21" % (self.recording, self.recording, pi.PWD))
    os.system("flac -f --best --sample-rate 16000 -o %s.flac %s.final.wav 2>/dev/null"  % (self.recording, self.recording))
    os.unlink(self.recording + ".final.wav")
    print " * Done."
    self.listener.answer(self.recording + '.flac')

  def cancel(self):
    print " # cancel", self.finished, self.started
    if self.finished == True:
      print " # cancel - noop"
      return

    if self.started == False:
      self.finished = True
      print " * Not a word in the past 10 seconds, cancelling"
      self.pipeline.set_state(gst.STATE_NULL)
      self.recorder.set_state(gst.STATE_NULL)
      self.listener.cancel_listening()

  def __start__(self, vader, arg0):
    print " # vader:start"
    struct = gst.Structure('vader_start')
    struct.set_value('arg0', arg0)
    vader.post_message(gst.message_new_application(vader, struct))

  def __stop__(self, vader, arg0):
    print " # vader:stop"
    struct = gst.Structure('vader_stop')
    struct.set_value('arg0', arg0)
    vader.post_message(gst.message_new_application(vader, struct))

  def __application_message__(self, bus, msg):
    msgtype = msg.structure.get_name()
    if msgtype == 'vader_stop':
      self.stop()
    elif msgtype == 'vader_start':
      self.start()

<小时/>

关于调试此问题的最佳方法的想法？

谢谢。

Answer 1

因此，作为启动线，您需要这样的东西:

gst-launch alsasrc device=hw:1 ! queue ! audioconvert ! audioresample ! "audio/x-raw-int, rate=16000, width=16, depth=16, channels=1" ! tee name=t ! queue ! audioresample ! "audio/x-raw-int, rate=8000" ! fvader name=vader auto-threshold=true ! pocketsphinx lm=/home/pi/dev/scarlettPi/config/speech/lm/scarlett.lm dict=/home/pi/dev/scarlettPi/config/speech/dict/scarlett.dic hmm=/usr/local/share/pocketsphinx/model/hmm/en_US/hub4wsj_sc_8k name=listener ! fakesink dump=1 t. ! valve drop=0 ! queue ! wavenc ! filesink location=test.wav async=0

这个想法是，一个 alsasrc 代表您的麦克风，并且由于这可能是独占访问，因此您不应该启动另一个 alsasrc 来访问同一设备。这也有助于获得更好的代码，因为您希望从进行语音检测的同一设备进行记录(据我所知)，并且通过使用相同的源，您可以保证情况会如此。

现在，为了在 python 中执行此操作，您可能应该设置管道“正确地”而不是进行解析启动，这意味着您必须实例化每个元素:

self.recording_valve = gst.element_factory_make('valve')

将它们添加到您的管道中:

self.pipeline.add (self.recording_valve)

然后链接它们:

self.recording_valve.link (self.next_element)

...这是 parse-launch 在内部执行的操作，但是，在开始和停止记录时，您现在可以执行以下操作:

self.recording_valve.set_property('drop', False)

开始录制，并且

self.recording_valve.set_property('drop', True)

停止。

(记住最初将 drop 设置为 True，因为默认情况下它是 False)

将所有这些放在一起的最后一部分是了解 T 恤及其请求垫。它可以有任意数量的 src-pad，您可以执行以下操作来链接它:

self.tee.get_request_pad('src%d').link(self.recording_valve_queue.get_pad('sink'))

基本上，您从Tee请求一个srcpad，并将其链接到阀门的sinkpad。您需要对每个 T 恤的分支执行此操作两次。

将其全部启动并运行，您应该会得到一些有用的东西。