Question

我在没有插孔的情况下在Ubuntu 14.04上安装了pyo并运行了Python 2.7.I遵循了pyo wiki中编写的Debian-based installing instructions。这是我使用的代码（它在pyo introduction page中）：

from pyo import *
s = Server().boot()
s.start()
a = Sine(mul=0.01).out()

得到了结果：

pyo version 0.6.8 (uses single precision)
ALSA lib pcm_dsnoop.c:618:(snd_pcm_dsnoop_open) unable to open slave
ALSA lib pcm_dmix.c:1022:(snd_pcm_dmix_open) unable to open slave
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
bt_audio_service_open: connect() failed: Connection refused (111)
bt_audio_service_open: connect() failed: Connection refused (111)
bt_audio_service_open: connect() failed: Connection refused (111)
bt_audio_service_open: connect() failed: Connection refused (111)
ALSA lib pcm_dmix.c:1022:(snd_pcm_dmix_open) unable to open slave
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
Expression 'parameters->channelCount <= maxChans' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 1514
Expression 'ValidateParameters( inputParameters, hostApi, StreamDirection_In )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 2818
portaudio error in Pa_OpenStream: Invalid number of channels
Portaudio error: Invalid number of channels
Server not booted.
The Server must be booted!
Traceback (most recent call last):
  File "/host/Python/Synth/synther.py", line 4, in <module>
    a = Sine(mul=0.01).out()
  File "/usr/lib/python2.7/dist-packages/pyolib/generators.py", line 58, in __init__
    PyoObject.__init__(self, mul, add)
  File "/usr/lib/python2.7/dist-packages/pyolib/_core.py", line 376, in __init__
    PyoObjectBase.__init__(self)
  File "/usr/lib/python2.7/dist-packages/pyolib/_core.py", line 262, in __init__
    raise PyoServerStateException("The Server must be booted before creating any audio object.")
pyolib._core.PyoServerStateException: The Server must be booted before creating any audio object.

PS：对使用插孔不感兴趣，已经遇到问题了。

Answer 1

使其可在Ubuntu 20.04上运行

尝试了几件事和很多挫折之后，以下工作成功了：

sudo apt install python3-pyo

和测试：

#/usr/bin/env python3
from pyo import *
s = Server()
s.boot()
s.start()
a = Sine(freq=440, mul=0.5)
a.out()
time.sleep(2)
a.stop()
s.stop()

根据需要产生2秒的440Hz正弦声音。也许需要重启。

如果在启动测试时程序正在使用音频，例如Chromium播放YouTube视频或VLC播放音乐，然后由于该异常而失败，因此请确保暂停/关闭所有此类应用程序。

另一件事值得做：

sudo apt install python3-wxgtk4.0

否则，pyo每次都会对丢失的wxWidgets发出警告。我认为这不会使运行失败。

上面的sudo apt install python3-pyo安装了pyo 1.0.0，它需要工作的所有二进制依赖项，其依赖项为：

apt-cache depends python3-pyo

是：

python3-pyo
  Depends: libc6
 |Depends: libjack-jackd2-0
  Depends: <libjack-0.125>
    libjack-jackd2-0
    libjack0
  Depends: liblo7
  Depends: libportaudio2
  Depends: libportmidi0
  Depends: libsndfile1
  Depends: python3
  Depends: python3
  Depends: <python3:any>
    python3:i386
    python3
  Recommends: python3-tk
  Recommends: jackd2

现在，如果我尝试使用以下方式升级Pyo：

python -m pip instal --user pyo==1.0.X

优先于1.0.0版本提供的发行版，我得到以下结果：

1.0.0：有效
1.0.1：有效

1.0.2：炸毁并显示错误：

ALSA lib conf.c:3558:(snd_config_hooks_call) Cannot open shared library libasound_module_conf_pulse.so (/usr/lib/alsa-lib/libasound_module_conf_pulse.so: libasound_module_conf_pulse.so: cannot open shared object file: No such file or directory)

但是随后我在系统上locate libasound_module_conf_pulse.so，并进行以下处理：

sudo ln -s /usr/lib/x86_64-linux-gnu/alsa-lib /usr/lib/alsa-lib

然后它起作用。

我也在https://github.com/belangeo/pyo/issues/200

报告了此情况

1.0.3：相同

值得尝试的另一件事是来自Playing sound in pyo and python：

from pyo import *
print("Default input device: %i" % pa_get_default_input())
print("Default output device: %i" % pa_get_default_output())
print("Audio host APIS:")
pa_list_host_apis()
pa_list_devices()

，然后尝试通过以下方式选择特定设备：

s = Server()
s.setOutputDevice(0)
s.boot()

但是安装python3-pyo后，我不需要这样做就可以正常工作。

https://github.com/belangeo/pyo/issues/200#issuecomment-734958205解释了如何与Jack一起使用。

Pyo server.boot（）在ubuntu 14.04上返回错误

1 个答案: