python - Mac os El Capitan 用 python 录制声音

Question

我正在尝试录制来自麦克风的声音。首先使用 PyAudio，然后使用 sounddevice，但都失败了。

这是 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 警告:140:此应用程序或其使用的库正在使用已弃用的 Carbon 组件管理器来托管音频单元。在未来的版本中将删除对此的支持。此外，这使得主机与版本 3 音频单元不兼容。请转换到 AudioComponent.h 中的 API。
并且没有任何记录。

据我了解，这是 El Capitan 的问题，尚未解决。但也许我错了？

所以我决定将库切换到声音设备:

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

再次没有任何记录。我做错了什么？

Answer 1

sounddevice.rec()不应该那样使用。您只需使用要记录的帧数调用它即可(请参阅 example from the docs ):

import sounddevice as sd

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

就是这样。录制一些声音不需要半页代码。

顺便说一句，您现在可以忽略警告，请参阅 https://github.com/spatialaudio/python-sounddevice/issues/10 .