【脚本语言系列】关于Python音频处理DirectSound, 你需要知道的事

如何使用DirectSound

# -*- coding:utf-8 -*-
#
import pywintypes
import struct
from win32com import directsound
import Tkinter
import tkFileDialog
WAV_HEADER_SIZE = struct.calcsize('<4sl4s4slhhllhh4sl')
class Window:
def __init__(self):
self.root = root = Tkinter.Tk()
buttonAdd = Tkinter.Button(root, text = 'Add', command = self.add)
buttonAdd.pack(side = 'left')
buttonPlay = Tkinter.Button(root, text = 'Play', command = self.play)
buttonPlay.pack(side = 'left')
buttonStop = Tkinter.Button(root, text = 'Stop', command = self.stop)
buttonStop.pack(side = 'left')
def add(self):
self.file = tkFileDialog.askopenfilename(title = 'Python DirectSound',filetypes =[('WAV','*.wav')])
def play(self):
f = open(self.file, 'rb')
header = f.read(WAV_HEADER_SIZE)
(riff, riffsize, wave, fmt, fmtsize,
format, nchannels, samplespersecond,
datarate, blockalign, bitspersample,
data, size) = \
struct.unpack('<4sl4s4slhhllhh4sl', header)
if riff!= 'RIFF' or fmtsize != 16 or fmt!='fmt ' or data != 'data':
raise 'Data Error'
wfx = pywintypes.WAVEFORMATEX()
wfx.wFormatTag = format
wfx.nChannels = nchannels
wfx.nSamplesPerSec = samplespersecond
wfx.nAvgBytesPerSec = datarate
wfx.nBlockAlign = blockalign
wfx.wBitsPerSample= bitspersample
d = directsound.DirectSoundCreate(None, None)
d.SetCooperativeLevel(None, directsound.DSSCL_PRIORITY)
sdesc = directsound.DSBUFFERDESC()
sdesc.dwFlags = (
directsound.DSBCAPS_STICKYFOCUS |
directsound.DSBCAPS_CTRLPOSITIONNOTIFY
)
sdesc.dwBufferBytes = size
sdesc.lpwfxFormat = wfx
self.buffer = buffer = d.CreateSoundBuffer(sdesc,None)
buffer.Update(0, f.read(size))
buffer.Play(0)
def stop(self):
self.buffer.Stop()
def MainLoop(self):
self.root.mainloop()
window = Window()
window.MainLoop()

什么是DirectSound