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[英]PyAudio 'unknown format: %r' error when trying to play a wav file
[英]How to convert pyaudio frames into wav format without writing to a file?
我想使用 pyaudio 和 IBM Bluemix 服务实现简单的语音到文本工具。 目前我需要录制音频,将其保存到磁盘,然后再次加载以将其发送到 Bluemix。
RATE=44100
RECORD_SECONDS = 10
CHUNKSIZE = 1024
# initialize portaudio
p = pyaudio.PyAudio()
stream = p.open(format=pyaudio.paInt16, channels=1, rate=RATE, input=True, frames_per_buffer=CHUNKSIZE)
frames = [] # A python-list of chunks(numpy.ndarray)
print("Please speak!")
for _ in range(0, int(RATE / CHUNKSIZE * RECORD_SECONDS)):
data = stream.read(CHUNKSIZE)
frames.append(np.fromstring(data, dtype=np.int16))
#Convert the list of numpy-arrays into a 1D array (column-wise)
numpydata = np.hstack(frames)
# close stream
stream.stop_stream()
stream.close()
p.terminate()
# save audio to disk
wav.write('out.wav',RATE,numpydata)
# Open audio file(.wav) in wave format
audio = open('/home/dolorousrtur/Documents/Projects/Capstone/out.wav', 'rb')
# send audio to bluemix service
headers={'Content-Type': 'audio/wav'}
r = requests.post(url, data=audio, headers=headers, auth=(username, password))
如何在不将它们写入磁盘的情况下将 pyaudio 帧转换为 wav 格式?
这是一个对我有用的例子。 如果将录制的音频放入speech_recognition
AudioData
object 中,则有多种方法可用于转换为各种音频格式(例如get_wav_data()
、 get_aiff_data()
、 get_flac_data()
等)。 看这里: speech_recognition AudioData
import pyaudio
import speech_recognition
from time import sleep
class Recorder():
sampling_rate = 44100
num_channels = 2
sample_width = 4 # The width of each sample in bytes. Each group of ``sample_width`` bytes represents a single audio sample.
def pyaudio_stream_callback(self, in_data, frame_count, time_info, status):
self.raw_audio_bytes_array.extend(in_data)
return (in_data, pyaudio.paContinue)
def start_recording(self):
self.raw_audio_bytes_array = bytearray()
pa = pyaudio.PyAudio()
self.pyaudio_stream = pa.open(format=pyaudio.paInt16,
channels=self.num_channels,
rate=self.sampling_rate,
input=True,
stream_callback=self.pyaudio_stream_callback)
self.pyaudio_stream.start_stream()
def stop_recording(self):
self.pyaudio_stream.stop_stream()
self.pyaudio_stream.close()
speech_recognition_audio_data = speech_recognition.AudioData(self.raw_audio_bytes_array,
self.sampling_rate,
self.sample_width)
return speech_recognition_audio_data
if __name__ == '__main__':
recorder = Recorder()
# start recording
recorder.start_recording()
# say something interesting...
sleep(3)
# stop recording
speech_recognition_audio_data = recorder.stop_recording()
# convert the audio represented by the ``AudioData`` object to
# a byte string representing the contents of a WAV file
wav_data = speech_recognition_audio_data.get_wav_data()
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