如何用pyaudio播放音频文件？

Question

我不太明白关于pyaudio的示例材料。看起来他们写了一个完整的小程序，让我有点困惑。

我想知道怎么才能播放一个单独的音频文件？

格式不是问题，我只想知道播放一个音频文件所需的最基本的代码。

Answer 1

这种方法需要使用ffmpeg来配合pydub，但它不仅可以播放wav格式的音频文件：

import pyaudio
import sys
from pydub import AudioSegment


if len(sys.argv) <= 1:
    print('No File Name!')
    sys.exit(1)


chunk = 1024
fn = ' '.join(sys.argv[1:])


pd = AudioSegment.from_file(fn)
p = pyaudio.PyAudio()

stream = p.open(format =
                p.get_format_from_width(pd.sample_width),
                channels = pd.channels,
                rate = pd.frame_rate,
                output = True)


i = 0
data = pd[:chunk]._data
while data:
    stream.write(data)
    i += chunk
    data = pd[i:i + chunk]._data


stream.close()    
p.terminate()
sys.exit(0)

Answer 2

也许这个简单的包装（警告：是随便写的）可以帮助你理解他们写的代码的意思。

import pyaudio
import wave
import sys

class AudioFile:
    chunk = 1024

    def __init__(self, file):
        """ Init audio stream """ 
        self.wf = wave.open(file, 'rb')
        self.p = pyaudio.PyAudio()
        self.stream = self.p.open(
            format = self.p.get_format_from_width(self.wf.getsampwidth()),
            channels = self.wf.getnchannels(),
            rate = self.wf.getframerate(),
            output = True
        )

    def play(self):
        """ Play entire file """
        data = self.wf.readframes(self.chunk)
        while data != b'':
            self.stream.write(data)
            data = self.wf.readframes(self.chunk)

    def close(self):
        """ Graceful shutdown """ 
        self.stream.close()
        self.p.terminate()

# Usage example for pyaudio
a = AudioFile("1.wav")
a.play()
a.close()

Answer 3

这个例子对我来说很简单。你只需要把这个例子保存为 playwav.py，然后这样调用：

python playwav.py my_fav_wav.wav

下面是带有一些额外注释的波形例子：

import pyaudio
import wave
import sys

# length of data to read.
chunk = 1024

# validation. If a wave file hasn't been specified, exit.
if len(sys.argv) < 2:
    print "Plays a wave file.\n\n" +\
          "Usage: %s filename.wav" % sys.argv[0]
    sys.exit(-1)

'''
************************************************************************
      This is the start of the "minimum needed to read a wave"
************************************************************************
'''
# open the file for reading.
wf = wave.open(sys.argv[1], 'rb')

# create an audio object
p = pyaudio.PyAudio()

# open stream based on the wave object which has been input.
stream = p.open(format =
                p.get_format_from_width(wf.getsampwidth()),
                channels = wf.getnchannels(),
                rate = wf.getframerate(),
                output = True)

# read data (based on the chunk size)
data = wf.readframes(chunk)

# play stream (looping from beginning of file to the end)
while data:
    # writing to the stream is what *actually* plays the sound.
    stream.write(data)
    data = wf.readframes(chunk)


# cleanup stuff.
wf.close()
stream.close()    
p.terminate()