WAV格式解析

女爷i 2022-06-11 02:00 238阅读 0赞

转自：[http://blog.csdn.net/zhihu008/article/details/7854529][http_blog.csdn.net_zhihu008_article_details_7854529]

从实际例子中看一下：  
WAV文件的头格式如下所示

<table> 
 <tbody> 
  <tr> 
   <td></td> 
   <td></td> 
   <td>偏移地址</td> 
   <td>字节数</td> 
   <td>数据类型</td> 
   <td>内容</td> 
  </tr> 
  <tr> 
   <td>文件头</td> 
   <td>RIFF头</td> 
   <td>00H</td> 
   <td>4</td> 
   <td>char</td> 
   <td>“RIFF”</td> 
  </tr> 
  <tr> 
   <td>04H</td> 
   <td>4</td> 
   <td>long</td> 
   <td>文件长度</td> 
  </tr> 
  <tr> 
   <td>WAV</td> 
   <td>08H</td> 
   <td>4</td> 
   <td>char</td> 
   <td>“WAVE”</td> 
  </tr> 
  <tr> 
   <td>format</td> 
   <td>0CH</td> 
   <td>4</td> 
   <td>char</td> 
   <td>“fmt”</td> 
  </tr> 
  <tr> 
   <td>10H</td> 
   <td>4</td> 
   <td>long</td> 
   <td>12;sizeof(PCMWAVEFORMAT)</td> 
  </tr> 
  <tr> 
   <td>14H</td> 
   <td>2</td> 
   <td>int</td> 
   <td>1(WAVE_FORMAT_PCM)</td> 
  </tr> 
  <tr> 
   <td>16H</td> 
   <td>2</td> 
   <td>int</td> 
   <td>通道数(声道)</td> 
  </tr> 
  <tr> 
   <td>18H</td> 
   <td>4</td> 
   <td>int</td> 
   <td>采样率</td> 
  </tr> 
  <tr> 
   <td>1CH</td> 
   <td>4</td> 
   <td>long</td> 
   <td>比特率/8</td> 
  </tr> 
  <tr> 
   <td>20H</td> 
   <td>2</td> 
   <td>int</td> 
   <td>数据块调整数</td> 
  </tr> 
  <tr> 
   <td>22H</td> 
   <td>2</td> 
   <td>int</td> 
   <td>采样点数据位数</td> 
  </tr> 
  <tr> 
   <td>data</td> 
   <td>？24H</td> 
   <td>4</td> 
   <td>char</td> 
   <td>“data”</td> 
  </tr> 
  <tr> 
   <td>？28H</td> 
   <td>4</td> 
   <td>long</td> 
   <td>音频数据大小</td> 
  </tr> 
  <tr> 
   <td>？2CH</td> 
   <td>？</td> 
   <td>long</td> 
   <td>音频数据</td> 
  </tr> 
 </tbody> 
</table>

拿到一个wav文件，用UltraEdit打开，如下图所示  
![这里写图片描述][SouthEast]

故我们所关心的PCM数据的采样类型为：  
1、通道数： 1 (单通道)  
2、采样率： 0x4E0C(19980Hz)  
3、采样点位数：0x10(16位)

[http_blog.csdn.net_zhihu008_article_details_7854529]: http://blog.csdn.net/zhihu008/article/details/7854529
[SouthEast]: /images/20220611/4a7e7b71c851427ea1cdbd4487e70fe8.png