我正在尝试将一台设备设置为播放,将另一台设备设置为捕获,我的 nano/etc/asound.conf
有这个:
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 代码抛出此错误:
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:
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()
我该如何解决这个错误?
提前谢谢你。
最佳答案
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
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。
关于python - Raspberry ALSA 声音输出/输入从机,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27053373/