Question

我正在尝试录制麦克风的声音。首先使用PyAudio然后使用声音设备，但都失败了。

以下是PyAudio的代码：

import pyaudio


def _recording_loop(samples_queue, running, stream, chunk_size):
    stream.start_stream()

    while running.is_set():
        samples_queue.put(stream.read(chunk_size))

    stream.stop_stream()


class Recoder:

    def __init__(self, frame_rate, period):
        self.proc = None
        self.running = Event()
        self.samples_queue = Queue()
        self.frame_rate = frame_rate
        self.chunk_size = (frame_rate*period) / 1000
        self.channels = 1

        self._pa = pyaudio.PyAudio()
        self._stream = None

    def start(self):
        if self.proc is None:
            self._stream = self._pa.open(format=pyaudio.paInt8,
                                         channels=self.channels,
                                         rate=self.frame_rate,
                                         input=True,
                                         frames_per_buffer=self.chunk_size)

            self.running.set()
            self.proc = Process(target=_recording_loop, args=[self.samples_queue, self.running, self._stream,
                                                              self.chunk_size])
            self.proc.start()

    def stop(self):
        if self.proc is not None:
            self.running.clear()
            self.proc.join()

        self._stream.close()
        self._pa.terminate()

    def empty(self):
        return self.samples_queue.empty()

    def read(self):
        res = []
        while not self.samples_queue.empty():
            res.append(self.samples_queue.get())
    return res

它给了我一个警告： Python[21648:645093] 13:42:01.242 WARNING: 140: This application, or a library it uses, is using the deprecated Carbon Component Manager for hosting Audio Units. Support for this will be removed in a future release. Also, this makes the host incompatible with version 3 audio units. Please transition to the API's in AudioComponent.h.并且没有任何记录。

据我所知，这与El Capitan有关，尚未解决。但也许我错了？

所以我决定将库切换到sounddevice：

from multiprocessing import Process, Queue, Event
import sounddevice as sd


def _recording_loop(samples_queue, running, frame_rate, chunk_size):
    while running.is_set():
        samples_queue.put(sd.rec(chunk_size, samplerate=frame_rate, channels=1,
                                 dtype='int8', blocking=True))


class Recoder:

    def __init__(self, frame_rate, period):

        self.proc = None
        self.running = Event()
        self.samples_queue = Queue()
        self.frame_rate = frame_rate
        self.period = period

        self.chunk_size = (frame_rate * period) / 1000

    def start(self):
        if self.proc is None:
            self.running.set()
            self.proc = Process(target=_recording_loop, args=[self.samples_queue, self.running, self.frame_rate,
                                                              self.chunk_size])
            self.proc.start()

    def stop(self):
        if self.proc is not None:
            self.running.clear()
            self.proc.join()

    def empty(self):
        return self.samples_queue.empty()

    def read(self):
        res = []
        while not self.samples_queue.empty():
            res.append(self.samples_queue.get())

        return res

它说：

||PaMacCore (AUHAL)|| Warning on line 530: err=''who?'', msg=Audio Hardware: Unknown Property
||PaMacCore (AUHAL)|| Warning on line 534: err=''who?'', msg=Audio Hardware: Unknown Property
||PaMacCore (AUHAL)|| Warning on line 445: err=''who?'', msg=Audio Hardware: Unknown Property

再一次没有记录。我做错了什么？

Answer 1

sounddevice.rec()并不意味着像这样使用。您只需使用要记录的帧数来调用它（参见example from the docs）：

import sounddevice as sd

fs = 44100
duration = 10  # seconds
myrecording = sd.rec(duration * fs, samplerate=fs, channels=2,
                     blocking=True)

那就是它。你不需要半页代码来记录一些声音。

顺便说一下，您现在可以忽略此警告，请参阅https://github.com/spatialaudio/python-sounddevice/issues/10。

Answer 2

昨天我遇到了类似的问题。它似乎是由使用声音设备的多处理引起的。当我在模块顶部import sounddevice时，我会||PaMacCore (AUHAL)|| Warning on line 530: err=''who?'', msg=Audio Hardware: Unknown Property，然后应用只会在创建sounddevice.RawInputStream时挂起。当我在run()方法中导入sounddevice时（我正在基于multiprocessing.Process创建一个新类），它可以正常工作。对我来说，似乎sounddevice在导入后会立即初始化，这必须在使用它的同一个进程中发生。修改代替Multiprocessing使用Threading。

Mac OS El Capitan用python录制声音

2 个答案: