树莓ALSA声音输出/输入从机 [英] Raspberry ALSA sound output / input slave

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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()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.

这篇关于树莓ALSA声音输出/输入从机的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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