python 播放 wav 文件

未使用其他库，

只是使用 pywin32 调用系统底层 API 播放 wav 文件。

# Our raison d'etre - playing sounds

import pywintypes
import struct
import win32event
import win32com.directsound.directsound as ds

import os


WAV_HEADER_SIZE = struct.calcsize('<4sl4s4slhhllhh4sl')

def wav_header_unpack(data):
    '''解包wav文件头信息'''
    (riff, riffsize, wave, fmt, fmtsize, format, nchannels, samplespersecond, 
    datarate, blockalign, bitspersample, data, datalength) = struct.unpack('<4sl4s4slhhllhh4sl', data)

    if riff != b'RIFF' or fmtsize != 16 or fmt != b'fmt ' or data != b'data':
        raise ValueError

    wfx = pywintypes.WAVEFORMATEX()
    wfx.wFormatTag = format
    wfx.nChannels = nchannels
    wfx.nSamplesPerSec = samplespersecond
    wfx.nAvgBytesPerSec = datarate
    wfx.nBlockAlign = blockalign
    wfx.wBitsPerSample = bitspersample

    return wfx, datalength



# 播放wav文件，直到结束
sound_file = "音效-足球观众的欢呼声.wav"
fname = os.path.join(os.path.dirname(__file__), sound_file)

f = open(fname, 'rb')

# 读取/解包wav文件头
hdr = f.read(WAV_HEADER_SIZE)

wfx, size = wav_header_unpack(hdr)


d = ds.DirectSoundCreate(None, None)
d.SetCooperativeLevel(None, ds.DSSCL_PRIORITY)


sdesc = ds.DSBUFFERDESC()

sdesc.dwFlags = ds.DSBCAPS_STICKYFOCUS | ds.DSBCAPS_CTRLPOSITIONNOTIFY
sdesc.dwBufferBytes = size
sdesc.lpwfxFormat = wfx

buffer = d.CreateSoundBuffer(sdesc, None)


event = win32event.CreateEvent(None, 0, 0, None)

notify = buffer.QueryInterface(ds.IID_IDirectSoundNotify)
notify.SetNotificationPositions((ds.DSBPN_OFFSETSTOP, event))


buffer.Update(0, f.read(size))
buffer.Play(0)

win32event.WaitForSingleObject(event, -1)