我想录制一个音轨并保存2个不同的.wav文件。音轨的保存时间应为ca左右。 6秒，每个.wav文件的长度应为12秒。
我试图通过多处理和pyaudio来做到这一点，但是我无法设法使其工作
请注意，我是python的初学者，这是我关于stackoverflow的第一篇文章！
def func1():
#Record and save a 12 seconds long .wav
def func2():
#Record and save a 12 seconds long .wav
if __name__ == '__main__':
p1 = Process(target=func1)
p1.start()
p2 = Process(target=func2)
p2.start()
p1.join()
p2.join()
#start func2 6 seconds after func1
I would expect a data structure like this:
|---1.wav---|---1.wav---|---1.wav---|
|---2.wav---|---2.wav---|---2.wav---|
6sec 12sec 18sec 24sec 30sec 36sec 42sec
编辑： 我想出了一些似乎运行良好的代码。延迟为.144秒。我很高兴对此代码进行改进。这段代码使用线程而不是多处理。
import pyaudio
import wave
from threading import Thread
import time
from datetime import datetime
FORMAT = pyaudio.paInt16
CHANNELS = 2
RATE = 44100
CHUNK = 1024
CHUNK1 = 1024
RECORD_SECONDS = 12
WAVE_OUTPUT_FILENAME1 = name = "outputs/output_1"+datetime.now().strftime("%m:%d:%Y-")
WAVE_OUTPUT_FILENAME2 = name = "outputs/output_2"+datetime.now().strftime("%m:%d:%Y-")
def func1():
while 1==1:
global FORMAT
global CHANNELS
global RATE
global CHUNK
global RECORD_SECONDS
global WAVE_OUTPUT_FILENAME1
WAVE_OUTPUT_FILENAME1 = name = "outputs/output1_"#+datetime.now().strftime("%m:%d:%Y-")
audio = pyaudio.PyAudio()
stream = audio.open(format=FORMAT, channels=CHANNELS,
rate=RATE, input=True,
frames_per_buffer=CHUNK)
print("recording...")
frames = []
WAVE_OUTPUT_FILENAME1 = WAVE_OUTPUT_FILENAME1+datetime.now().strftime("%H;%M;%S.%f--")
for i in range(0, int(RATE / CHUNK * RECORD_SECONDS)):
data = stream.read(CHUNK)
frames.append(data)
WAVE_OUTPUT_FILENAME1 = WAVE_OUTPUT_FILENAME1 + datetime.now().strftime("%H;%M;%S.%f")+".wav"
print("finished recording")
# stop Recording
stream.stop_stream()
stream.close()
audio.terminate()
waveFile = wave.open(WAVE_OUTPUT_FILENAME1, 'wb')
waveFile.setnchannels(CHANNELS)
waveFile.setsampwidth(audio.get_sample_size(FORMAT))
waveFile.setframerate(RATE)
waveFile.writeframes(b''.join(frames))
waveFile.close()
def func2():
time.sleep(6)
while 1==1:
global FORMAT
global CHANNELS
global RATE
global CHUNK1
global RECORD_SECONDS
global WAVE_OUTPUT_FILENAME2
WAVE_OUTPUT_FILENAME2 = name = "outputs/output2_"#+datetime.now().strftime("%m:%d:%Y-")
audio = pyaudio.PyAudio()
stream = audio.open(format=FORMAT, channels=CHANNELS,
rate=RATE, input=True,
frames_per_buffer=CHUNK1)
print("recording...")
frames = []
WAVE_OUTPUT_FILENAME2 = WAVE_OUTPUT_FILENAME2+datetime.now().strftime("%H;%M;%S.%f--")
for i in range(0, int(RATE / CHUNK1 * RECORD_SECONDS)):
data = stream.read(CHUNK1)
frames.append(data)
WAVE_OUTPUT_FILENAME2 = WAVE_OUTPUT_FILENAME2 + datetime.now().strftime("%H;%M;%S.%f")+".wav"
print("finished recording")
# stop Recording
stream.stop_stream()
stream.close()
audio.terminate()
waveFile = wave.open(WAVE_OUTPUT_FILENAME2, 'wb')
waveFile.setnchannels(CHANNELS)
waveFile.setsampwidth(audio.get_sample_size(FORMAT))
waveFile.setframerate(RATE)
waveFile.writeframes(b''.join(frames))
waveFile.close()
if __name__ == '__main__':
Thread(target = func1).start()
Thread(target = func2).start()
答案 0 :(得分：1)
您为什么认为您需要multiprocessing？我认为这只会使事情复杂化
仅以6秒（或更小）的块/帧进行记录并将正确的帧写入每个文件怎么样？
我有些不为所动，并编写了一个不错的课程来做到这一点：
import pyaudio
import wave
import time
class OverlappedRecorder:
def __init__(
self, secs_per_file, secs_between_file, *,
num_channels=2, sample_rate=48000,
sample_format=pyaudio.paInt16,
):
# various constants needed later
self.num_channels = num_channels
self.sample_width = pyaudio.get_sample_size(sample_format)
self.sample_rate = sample_rate
self.frames_between_start = int(secs_between_file * sample_rate)
self.frames_per_file = int(secs_per_file * sample_rate)
# mutable state needed to keep everything going
self.files = []
self.frames_till_next_file = 0
self.pa = pyaudio.PyAudio()
self.stream = self.pa.open(
format=sample_format, channels=num_channels,
rate=sample_rate, frames_per_buffer=1024,
input=True, start=False,
stream_callback=self._callback,
)
def sleep_while_active(self):
while self.stream.is_active():
time.sleep(0.2)
def begin_wave_file(self):
"internal function to start a new WAV file"
path = time.strftime(
'recording-%Y-%m-%d-%H.%M.%S.wav',
time.localtime()
)
file = wave.open(path, 'wb')
file.setnchannels(self.num_channels)
file.setsampwidth(self.sample_width)
file.setframerate(self.sample_rate)
self.files.append(file)
# context manager stuff, recording starts when entered using "with"
def __enter__(self):
self.stream.start_stream()
return self
# exiting shuts everything down
def __exit__(self, exc_type, exc_val, exc_tb):
self.stream.stop_stream()
self.stream.close()
self.pa.terminate()
for file in self.files:
file.close()
# called by pyaudio when a new set of frames are ready
def _callback(self, data, frame_count, time_info, status):
self.frames_till_next_file -= frame_count
# see if we need to start a new file
if self.frames_till_next_file < 0:
self.frames_till_next_file += self.frames_between_start
self.begin_wave_file()
# can't remove from lists while iterating
# keep a list of files to close and remove later
done = []
for file in self.files:
remain = self.frames_per_file - file.getnframes()
# add appropriate amount of data to all open files
if frame_count < remain:
file.writeframesraw(data)
else:
remain *= self.sample_width * self.num_channels
file.writeframesraw(data[:remain])
done.append(file)
# close anything that finished
for file in done:
file.close()
self.files.remove(file)
# tell pyaudio to keep going
return (None, pyaudio.paContinue)
基本用法是：创建一个对象，使用with输入该对象，它将开始记录，退出时将停止并清理。
rec = OverlappedRecorder(12, 6)
with rec:
time.sleep(30)
将其运行30秒，或者您可以这样做：
with OverlappedRecorder(12, 6) as rec:
rec.sleep_while_active()
让它运行，直到您按Ctrl + C杀死该程序为止，或者可以在其中按input()进行调用，以使其在按Enter键或其他任何喜欢的功能时停止。
对您发布的代码的一些评论：
global变量start()第二个Thread WAVE_OUTPUT_FILENAME1？只需保存start_time和end_time，然后一次性格式化字符串read()分块地进行，如果您知道它将适合内存，则只需一次读取所有内容类似：
import pyaudio
import wave
import time
from datetime import datetime
from threading import Thread
FORMAT = pyaudio.paInt16
CHANNELS = 2
RATE = 44100
RECORD_SECONDS = 12
def recorder(prefix):
audio = pyaudio.PyAudio()
stream = audio.open(
format=FORMAT, channels=CHANNELS,
rate=RATE, input=True,
)
try:
while True:
start_time = datetime.now()
print("recording started", start_time)
data = stream.read(RATE * RECORD_SECONDS, False)
end_time = datetime.now()
print("finished", end_time)
name = f'{prefix}{start_time:%Y-%m-%d-%H-%M-%S.%f}-{end_time:%H-%M-%S.%f}.wav'
print("writing", name)
with wave.open(name, 'wb') as waveFile:
waveFile.setnchannels(CHANNELS)
waveFile.setsampwidth(audio.get_sample_size(FORMAT))
waveFile.setframerate(RATE)
waveFile.writeframes(data)
finally:
stream.stop_stream()
stream.close()
audio.terminate()
if __name__ == '__main__':
Thread(target=recorder, args=('outputs/output_1-',)).start()
time.sleep(6)
Thread(target=recorder, args=('outputs/output_2-',)).start()
一些区别：
pyaudio有一个内部线程负责音频缓冲区）希望所有帮助/有意义！