使用PyAudio 进行录音、播放
2019-08-31 python 3393
要使用PyAudio,首先使用 pyaudio.PyAudio()
(1)实例化PyAudio ,它设置portaudio系统。
要录制或播放音频,请使用 pyaudio.PyAudio.open()
(2)在所需设备上打开所需音频参数的流。这设置了 pyaudio.Stream 播放或录制音频。
通过使用流式传输 pyaudio.Stream.write() 音频数据或使用流式传输音频数据来播放音频 pyaudio.Stream.read() 。
(3)请注意,在“阻止模式”中,每个 pyaudio.Stream.write() 或 pyaudio.Stream.read() 阻止直到所有给定/请求的帧都被播放/记录。或者,要动态生成音频数据或立即处理录制的音频数据,请使用下面概述的“回调模式”。
使用 pyaudio.Stream.stop_stream() 暂停播放/录制,并 pyaudio.Stream.close() 终止流。
(4)最后,使用 pyaudio.PyAudio.terminate()
(5)终止portaudio会话
1).采集音频
import pyaudio import wave from tqdm import tqdm def record_audio(wave_out_path,record_second): CHUNK = 1024 FORMAT = pyaudio.paInt16 CHANNELS = 2 RATE = 44100 p = pyaudio.PyAudio() stream = p.open(format=FORMAT, channels=CHANNELS, rate=RATE, input=True, frames_per_buffer=CHUNK) wf = wave.open(wave_out_path, 'wb') wf.setnchannels(CHANNELS) wf.setsampwidth(p.get_sample_size(FORMAT)) wf.setframerate(RATE) print("* recording") for i in tqdm(range(0, int(RATE / CHUNK * record_second))): data = stream.read(CHUNK) wf.writeframes(data) print("* done recording") stream.stop_stream() stream.close() p.terminate() wf.close() record_audio("output.wav",record_second=4)
2).播放音频
通过tqdm,显示播放进度条
"""PyAudio Example: Play a WAVE file.""" import pyaudio import wave from tqdm import tqdm def play_audio(wave_path): CHUNK = 1024 wf = wave.open(wave_path, 'rb') # instantiate PyAudio (1) p = pyaudio.PyAudio() # open stream (2) stream = p.open(format=p.get_format_from_width(wf.getsampwidth()), channels=wf.getnchannels(), rate=wf.getframerate(), output=True) # read data data = wf.readframes(CHUNK) # play stream (3) datas = [] while len(data) > 0: data = wf.readframes(CHUNK) datas.append(data) for d in tqdm(datas): stream.write(d) # stop stream (4) stream.stop_stream() stream.close() # close PyAudio (5) p.terminate() play_audio("output.wav")
3).以回调方式播放音频
"""PyAudio Example: Play a WAVE file.""" import pyaudio import wave from tqdm import tqdm import time def play_audio_callback(wave_path): CHUNK = 1024 wf = wave.open(wave_path, 'rb') # instantiate PyAudio (1) p = pyaudio.PyAudio() def callback(in_data, frame_count, time_info, status): data = wf.readframes(frame_count) return (data, pyaudio.paContinue) # open stream (2) stream = p.open(format=p.get_format_from_width(wf.getsampwidth()), channels=wf.getnchannels(), rate=wf.getframerate(), output=True, stream_callback=callback) # read data stream.start_stream() while stream.is_active(): time.sleep(0.1) # stop stream (4) stream.stop_stream() stream.close() # close PyAudio (5) p.terminate() play_audio_callback("output.wav")
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