最近在处理wav相关文件，碰见一工具产生的ualw文件不带header，顺手用python给wav格式文件加头处理，让普通播放器也能播放。
（原文：http://www.cnblogs.com/ryhan/p/6854348.html）
#! /usr/bin/env python
# coding=utf-8
__author__ = 'ryhan'
# 以下代码解决输出乱码问题
import sys
import os
import struct
# print sys.getdefaultencoding()
reload(sys)
sys.setdefaultencoding('utf-8')
# print sys.getdefaultencoding()
class WaveOps(object):
def __init__(self):
pass
@staticmethod
def add_ulaw_header(s_flie, t_file):
"""
文件加头
:param wavfile:
:return:
"""
# 文件检测
if not s_flie or not os.path.exists(s_flie):
return False, 's_flie not exists !'
# 文件头
if os.path.exists(t_file):
with open(t_file, 'rb') as fin:
riff_flag = fin.read(4)
if riff_flag == 'RIFF':
return False, 't_file already has header with RIFF !'
# riff_flag, = struct.unpack('4s', fin.read(4))
with open(s_flie, 'rb') as fin:
with open(t_file, 'wb') as fout:
# fin.seek(0, os.SEEK_SET)
start_pos = fin.tell()
fin.seek(0, os.SEEK_END)
end_pos = fin.tell()
ulaw_header = WaveOps.create_ulaw_header(end_pos - start_pos)
fout.write(ulaw_header)
fin.seek(os.SEEK_SET)
fout.write(fin.read())
if not os.path.exists(t_file):
return False, 't_file not create success !'
with open(t_file, 'rb') as ftag:
riff_flag = ftag.read(4)
print riff_flag
if riff_flag == 'RIFF':
return True, 'add header success !'
else:
return False, 'add header failure ! but t_file has created ~ ! '
@staticmethod
def create_ulaw_header(audio_size, sampleRate=8000, bits=8, channel=1):
"""
00H 4 char "RIFF" char riff_id[4]="RIFF"
04H 4 long int 文件总长-8 long int size0=文总长-8
08H 8 char "WAVEfmt " char wave_fmt[8]
10H 4 long int 12000000H(ULAW) long int size1=0x12
14H 2 int 07 00H int fmttag=0x07
16H 2 int 声道数 int channel=1 或2
18H 4 long int 采样率 long int samplespersec
1CH 4 long int 每秒播放字节数 long int bytepersec
20H 2 int 采样一次占字节数 int blockalign=0x01
22H 4 long int 量化数 long int bitpersamples=8
26H 4 char "fact" char wave_fact="fact"
2AH 8 char 0400000000530700H定 char temp
32H 4 char "data" char wave_data="data"
36H 4 long int 采样数据字节数 lont int size2=文长-58
"""
header = ''
# 00H 4 char "RIFF" char riff_id[4]="RIFF"
header += struct.pack('4c', 'R', 'I', 'F', 'F')
# 04H 4 long int 文件总长-8 long int size0=文总长-8
header += struct.pack('i', audio_size + 58 - 8)
# 08H 8 char "WAVEfmt " char wave_fmt[8]
header += struct.pack('8c', 'W', 'A', 'V', 'E', 'f', 'm', 't', ' ')
# 10H 4 long int 12000000H(ULAW) long int size1=0x12
header += 'x12x00x00x00'
# 14H 2 int 07 00H int fmttag=0x07
header += 'x07x00'
# 16H 2 int 声道数 int channel=1 或2
header += struct.pack('H', channel)
# 18H 4 long int 采样率 long int samplespersec
header += struct.pack('i', sampleRate)
# 1CH 4 long int 每秒播放字节数 long int bytepersec
header += struct.pack('i', sampleRate * bits / 8)
# 20H 2 int 采样一次占字节数 int blockalign=0x01
header += struct.pack('H', channel * bits / 8)
# 22H 4 long int 量化数 long int bitpersamples=8
header += struct.pack('i', bits)
# 26H 4 char "fact" char wave_fact="fact"
# rHeadInfo += struct.pack('4c', 'f', 'a', 'c', 't')
# 2AH 8 char 0400000000530700H定 char temp
# rHeadInfo += struct.pack('8c', 'c', 'h', 'a', 'r', 't', 'e', 'm', 'p')
# 32H 4 char "data" char wave_data="data"
header += struct.pack('4c', 'd', 'a', 't', 'a')
# 36H 4 long int 采样数据字节数 lont int size2=文长-58
header += struct.pack('i', audio_size)
return header
if __name__ == '__main__':
print WaveOps.add_ulaw_header('wav/2-raw.wav', 'wav/2-new.wav')
相关代码文件下载：files.cnblogs.com/files/ryhan/WavOps.zip