用pyaudio录制麦克风

如何解决用pyaudio录制麦克风

我尝试用 pyaudio 录制我的麦克风。所以我使用示例程序：

import pyaudio
import wave

if __name__ == "__main__":
    FORMAT = pyaudio.paInt16
    CHANNELS = 1
    RATE = 16000
    CHUNK = 1024
    RECORD_SECONDS = 6
    WAVE_OUTPUT_FILENAME = 'filename'

    audio = pyaudio.PyAudio()

    pa = pyaudio.PyAudio()
    list_audio = []
    for x in range(0,pa.get_device_count()):
        info = pa.get_device_info_by_index(x)
        print("info {0}".format(info))

    # start Recording
    stream = audio.open(format=FORMAT,channels=CHANNELS,rate=RATE,input=True,frames_per_buffer=CHUNK)
                        # sample_rate=RATE)
    print("recording...")
    print('---------------------------------')
    print(int(RATE / CHUNK * RECORD_SECONDS))
    print('*********************************')

    frames = []

    for i in range(0,int(RATE / CHUNK * RECORD_SECONDS)):
        data = stream.read(CHUNK)
        print("Recording . . .")

        frames.append(data)
    print("Recording finished. . .")

    # stop Recording
    stream.stop_stream()
    stream.close()
    audio.terminate()

    waveFile = wave.open(WAVE_OUTPUT_FILENAME,'wb')
    waveFile.setnchannels(CHANNELS)
    waveFile.setsampwidth(2)
    audio.get_sample_size(FORMAT)
    waveFile.setframerate(RATE)
    waveFile.writeframes(b''.join(frames))
    waveFile.close()

当我运行它时，我的 wav 文件只是噪音。我在 ubuntu 18.04 上工作。 我认为这来自脉冲/alsa 兼容性。但是当我在 Skype 上使用我的麦克风时，没有任何问题。

此外，当我尝试记录特定设备时，我收到该错误：

device {'index': 0,'structVersion': 2,'name': 'HDA Intel PCH: ALC293 Analog (hw:0,0)','hostApi': 0,'maxInputChannels': 2,'maxOutputChannels': 2,'defaultLowInputLatency': 0.005804988662131519,'defaultLowOutputLatency': 0.005804988662131519,'defaultHighInputLatency': 0.034829931972789115,'defaultHighOutputLatency': 0.034829931972789115,'defaultSampleRate': 44100.0}
 ....
 device {'index': 4,'name': 'HDA Intel PCH: HDMI 3 (hw:0,9)','maxInputChannels': 0,'maxOutputChannels': 8,'defaultLowInputLatency': -1.0,'defaultHighInputLatency': -1.0,'defaultSampleRate': 44100.0}
 device {'index': 5,'name': 'HDA Intel PCH: HDMI 4 (hw:0,10)','defaultSampleRate': 44100.0}
 device {'index': 6,'name': 'AK5371: USB Audio (hw:1,'maxOutputChannels': 0,'defaultLowInputLatency': 0.008684807256235827,'defaultLowOutputLatency': -1.0,'defaultHighOutputLatency': -1.0,'defaultSampleRate': 44100.0}
Chosen index: 6
 device {'index': 7,'name': 'HD USB CAMERA: Audio (hw:2,'defaultSampleRate': 44100.0}
 device {'index': 8,'name': 'Jabra SPEAK 510 USB: Audio (hw:3,'maxInputChannels': 1,'defaultLowInputLatency': 0.0239375,'defaultLowOutputLatency': 0.0239375,'defaultHighInputLatency': 0.096,'defaultHighOutputLatency': 0.096,'defaultSampleRate': 16000.0}
 device {'index': 9,'name': 'sysdefault','maxInputChannels': 128,'maxOutputChannels': 128,'defaultLowInputLatency': 0.021333333333333333,'defaultLowOutputLatency': 0.021333333333333333,'defaultHighInputLatency': 0.021333333333333333,'defaultHighOutputLatency': 0.021333333333333333,'defaultSampleRate': 48000.0}
 device {'index': 10,'name': 'front','defaultSampleRate': 44100.0}
 device {'index': 11,'name': 'surround40','defaultSampleRate': 44100.0}
 device {'index': 12,'name': 'surround51','defaultSampleRate': 44100.0}
 device {'index': 13,'name': 'surround71','defaultSampleRate': 44100.0}
 device {'index': 14,'name': 'hdmi','defaultSampleRate': 44100.0}
 device {'index': 15,'name': 'pulse','maxInputChannels': 32,'maxOutputChannels': 32,'defaultLowInputLatency': 0.008707482993197279,'defaultLowOutputLatency': 0.008707482993197279,'defaultSampleRate': 44100.0}
 device {'index': 16,'name': 'dmix','defaultSampleRate': 48000.0}
 device {'index': 17,'name': 'default','defaultSampleRate': 44100.0}
Expression 'paInvalidSampleRate' failed in 'src/hostapi/alsa/pa_linux_alsa.c',line: 2048
Expression 'PaAlsaStreamComponent_InitialConfigure( &self->capture,inParams,self->primeBuffers,hwParamsCapture,&realSr )' failed in 'src/hostapi/alsa/pa_linux_alsa.c',line: 2719
Expression 'PaAlsaStream_Configure( stream,inputParameters,outputParameters,sampleRate,framesPerBuffer,&inputLatency,&outputLatency,&hostBufferSizeMode )' failed in 'src/hostapi/alsa/pa_linux_alsa.c',line: 2843
Traceback (most recent call last):
  File "/home/xavier/dev/3003_mdt/module-test-gui/controller.py",line 165,in start_record_bag
    stream_callback=self.new_frame)
  File "/home/xavier/.local/lib/python3.6/site-packages/pyaudio.py",line 750,in open
    stream = Stream(self,*args,**kwargs)
  File "/home/xavier/.local/lib/python3.6/site-packages/pyaudio.py",line 441,in __init__
    self._stream = pa.open(**arguments)
OSError: [Errno -9997] Invalid sample rate

我也尝试用 pyQt 收集我的数据，但没有好的结果：

def on_new_audio_data(self,buff: QtMultimedia.QAudioBuffer):
    with self.mutex:
        import ctypes
        audio_data = AudioData()
        length_array = buff.sampleCount()
        byte_array = (ctypes.c_uint8 * length_array).from_address(buff.constData().__int__())
        # val = struct.unpack('<BBh',byte_array)

        byte_buffer = bytearray()
        for short_index in range(0,len(byte_array)):
            byte_buffer.append(byte_array[short_index])

每两个字节有一个零值......

解决方法

您可以尝试查看是否使用了正确的输入设备。将 input_device_index={the right input device} 参数添加到 audio.open。

您可以像这样检查设备的 ID：How to select a specific input device with PyAudio

import pyaudio
p = pyaudio.PyAudio()
info = p.get_host_api_info_by_index(0)
numdevices = info.get('deviceCount')
for i in range(0,numdevices):
        if (p.get_device_info_by_host_api_device_index(0,i).get('maxInputChannels')) > 0:
            print "Input Device id ",i," - ",p.get_device_info_by_host_api_device_index(0,i).get('name')