簡述Python如何呼叫系統底層API播放wav文件

這篇文章主要介紹了Python呼叫系統底層API播放wav檔案的方法,涉及Python使用pywin32呼叫系統底層API讀取與播放wav檔案的相關操作技巧,需要的朋友可以參考下

#本文實例講述了Python呼叫系統底層API播放wav檔案的方法。分享給大家供大家參考，具體如下：

這裡未使用其他函式庫，只是使用 pywin32 呼叫系統底層 API 播放 wav 檔案。

具體程式碼如下：

# 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(&#39;<4sl4s4slhhllhh4sl&#39;)
def wav_header_unpack(data):
  &#39;&#39;&#39;解包wav文件头信息&#39;&#39;&#39;
  (riff, riffsize, wave, fmt, fmtsize, format, nchannels, samplespersecond, \
  datarate, blockalign, bitspersample, data, datalength) = struct.unpack(&#39;<4sl4s4slhhllhh4sl&#39;, data)
  if riff != b&#39;RIFF&#39; or fmtsize != 16 or fmt != b&#39;fmt &#39; or data != b&#39;data&#39;:
    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, &#39;rb&#39;)
# 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)

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