树莓ALSA声音输出/输入从机 [英] Raspberry ALSA sound output / input slave
问题描述
我正在尝试设置一台设备用于播放,另一台设备用于捕获,我的 nano/etc/asound.conf
有这个:
I'm trying to set one device for playback and another one for capture, my nano /etc/asound.conf
has this:
pcm.!default {
type asym
playback.pcm "plughw:1,1"
capture.pcm "plughw:1,0"
}
ctl.!default {
type hw
card 0
}
我可以完美地播放声音,但我无法录制声音,我的python代码抛出了这个错误:
I can play sound perfectly, but I cannot record sound, my python code is throwing this errors:
ALSA lib pcm_dmix.c:1018:(snd_pcm_dmix_open)
unable to open slave
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate)
Unknown PCM cards.pcm.hdmi
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.hdmi
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.modem
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.modem
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.phoneline
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.phoneline
ALSA lib pcm_dmix.c:957:(snd_pcm_dmix_open)
The dmix plugin supports only playback stream
ALSA lib pcm_dmix.c:1018:(snd_pcm_dmix_open)
unable to open slave
这是我正在运行的代码的一部分:
This is a part of the code I'm running:
import pyaudio
class Microphone(AudioSource):
def __init__(self, device_index = None):
self.device_index = device_index
self.format = pyaudio.paInt16 # 16-bit int sampling
self.SAMPLE_WIDTH = pyaudio.get_sample_size(self.format)
self.RATE = 16000 # sampling rate in Hertz
self.CHANNELS = 1 # mono audio
self.CHUNK = 1024 # number of frames stored in each buffer
self.audio = None
self.stream = None
def __enter__(self):
self.audio = pyaudio.PyAudio()
self.stream = self.audio.open(
input_device_index = self.device_index,
format = self.format, rate = self.RATE, channels = self.CHANNELS, frames_per_buffer = self.CHUNK,
input = True, # stream is an input stream
)
return self
def __exit__(self, exc_type, exc_value, traceback):
self.stream.stop_stream()
self.stream.close()
self.stream = None
self.audio.terminate()
我应该如何解决这个错误?
How am I supposed to fix this error?
提前致谢.
推荐答案
pyaudio
基于 PortAudio;所有这些愚蠢的消息都是因为 PortAudio 试图枚举音频设备.
pyaudio
is based on PortAudio; all those silly messages are because of PortAudio's attempts to enumerate audio devices.
pyaudio
设备索引不一定与 ALSA 卡索引相同.使用 get_device_count() 和 get_device_info_by_index() 找到要使用的输入设备.
pyaudio
device indexes are not necessarily the same as ALSA card indexes.
Use get_device_count() and get_device_info_by_index() to find the input device to use.
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