PyAudio 在 Raspberry Pi 上引发警告

Posted 2023-03-29

【中文标题】PyAudio 在 Raspberry Pi 上引发警告

【英文标题】：PyAudio throws warnings on Raspberry Pi

【发布时间】：2019-03-26 09:37:11

【问题描述】：

由于我在较早的帖子和其他论坛中都找不到我的问题的答案，因此我想向 *** 社区寻求建议。

我正在使用内核版本 4.14.71-v7 的树莓派版本 9（拉伸）。 它应该是可用的最新图像。

我想使用 pyaudio 来播放和录制音频流。在我的 Windows 家用电脑上，一切正常，没有任何问题。但即使在树莓派上创建一个 pyaudio 对象也会引发一些奇怪的警告。

首先我安装了以下东西来使用pyaudio：

    sudo apt-get install libasound-dev

树莓派自动选择 libasound2-dev

    sudo apt-get install portaudio19-dev
    sudo apt-get install python3-pyaudio

如果我运行以下 python 代码：

   import pyaudio
   py=pyaudio.PyAudio()

我收到以下警告：

   '$'ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.bcm2835_alsa.pcm.front.0:CARD=0'
   '$'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.bcm2835_alsa.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.bcm2835_alsa.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.bcm2835_alsa.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.bcm2835_alsa.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.bcm2835_alsa.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.bcm2835_alsa.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.bcm2835_alsa.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.bcm2835_alsa.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.bcm2835_alsa.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.bcm2835_alsa.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.hdmi
   '$'ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.hdmi
   '$'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 confmisc.c:1281:(snd_func_refer) Unable to find definition 'defaults.bluealsa.device'
   '$'ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
   '$'ALSA lib conf.c:4996:(snd_config_expand) Args evaluate error: No such file or directory
   '$'ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM bluealsa
   '$'ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'defaults.bluealsa.device'
   '$'ALSA lib conf.c:4528:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
   '$'ALSA lib conf.c:4996:(snd_config_expand) Args evaluate error: No such file or directory
   '$'ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM bluealsa
   '$'connect(2) call to /tmp/jack-1000/default/jack_0 failed (err=No such file or directory)
   '$'attempt to connect to server failed

对我来说，pyaudio 似乎想要使用 hdmi（带有环绕声）， 插孔和蓝牙 (bluealsa)。似乎pyaudio不使用portaudio。 但我不确定。

也许有人知道，为什么只创建一个对象就会引发这些警告。 在这些警告旁边，pyaudio 库似乎可以工作。我可以播放 并录制音频流，但每次都会出现这些警告。

【问题讨论】：

见***.com/q/36956083和***.com/q/7088672。

这能回答你的问题吗？ PyAudio working, but spits out error messages each time

【参考方案1】：

感谢 *** 社区。我有一个旧主题的链接，它提供了完美的解决方案。

主题名称：“PyAudio 工作，但每次都吐出错误消息”

解释了所有这些警告出现的原因以及如何用python处理它们。

非常感谢！！！