import pyaudio
CHUNK = 1024
FORMAT = pyaudio.paInt16
CHANNELS = 2
RATE = 16000
p = pyaudio.PyAudio()
stream = p.open(format=FORMAT,
channels=CHANNELS,
rate=RATE,
input=True,
frames_per_buffer=CHUNK)
p = pyaudio.PyAudio() 创建一个PyAudio的
stream = p.open(format=FORMAT，channels=CHANNELS, rate=RATE,input=True,output=False, frames_per_buffer=CHUNK)
用open函数打开一个音频的输入流
文档中对各参数的说明
def __init__(self,
PA_manager,
rate, #Sampling rate 采样率
channels, #Number of channels音轨数
format, #Sampling size and format. See |PaSampleFormat|.采样点的大小和类型，见PaSampleFormat
input=False, #Specifies whether this is an input stream，Defaults to input is output is PaMacCoreStreamInfo
output_host_api_specific_stream_info=None, #Specifies a host API ，specific stream information data structure for output.See :py:class:PaMacCoreStreamInfo.
stream_callback=None): #Specifies a callback function for *non-blocking* (callback) operation,which indicates *blocking* operation (i.e.,:py:func:Stream.read and :py:func:Stream.write).
简而言之，我们要使用的参数与示例中的参数类似：
[En]
In a nutshell, the parameters we are going to use are like those in the example:
format采样数据的格式，在文档中有给出定义好的格式变量
PaSampleFormat Sample Formats
paFloat32 #: 32 bit float
paInt32 #: 32 bit int
paInt24 #: 24 bit int
paInt16 #: 16 bit int
paInt8 #: 8 bit int
paUInt8 #: 8 bit unsigned int
paCustomFormat t #: a custom data format
channels音轨数一般取2
rate采样率即每秒采样多少次
input=True，Ture代表这是一条输入流，False代表这不是输入流
frames_per_buffer每个缓冲多少帧
通过设置这些参数，我们打开了一个可用于输入的音频流。
[En]
By setting these parameters, we open an audio stream that can be used for input.
RECORD_SECONDS = 2
print("start recording......")
frames = []
for i in range(0, int(RATE / CHUNK * RECORD_SECONDS) + 1):
data = stream.read(CHUNK)
frames.append(data)
print("end!")
stream.stop_stream()
stream.close()
p.terminate()
stream.read(CHUNK)每次读chunk个数据
通过int(RATE / CHUNK * RECORD_SECONDS)计算要读多少次，2秒*每秒的采样率/每次读多少数据=需要读多少次frames.append(data)将读出的数据保存到列表中
stream.stop_stream() 停止输入流
stream.close() 关闭输入流
p.terminate() 终止portaudio
import wave
WAVE_OUTPUT_FILENAME = "Oldboy.wav"
wf = wave.open(WAVE_OUTPUT_FILENAME, 'wb')
wf.setnchannels(CHANNELS)
wf.setsampwidth(p.get_sample_size(FORMAT))
wf.setframerate(RATE)
wf.writeframes(b''.join(frames))
wf.close()
wave.open(WAVE_OUTPUT_FILENAME, ‘wb’) 以’wb’二进制流写的方式打开一个文件
wf.setnchannels(CHANNELS) 设置音轨数
wf.setsampwidth(p.get_sample_size(FORMAT)) 设置采样点数据的格式，和FOMART保持一致
wf.setframerate(RATE) 设置采样率与RATE要一致wf.writeframes(b”.join(frames))将声音数据写入文件
wf.close() 关闭文件流，释放句柄Original: https://blog.csdn.net/qq_55796594/article/details/120343559
Author: 午夜零时
Title: 音频信号处理（一）语音录制
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