📄 wavecn_com 世纪音频 - 音频应用 - 基于wavex低级音频函数的实时语音通信.htm
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</SPAN>↓</P>
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WM_WOM_DONE</SPAN></P>
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</SPAN>│<SPAN>
</SPAN>↘</P>
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</SPAN>│ <SPAN> </SPAN>缓冲播放完或停止输出消息</P>
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</SPAN>↓</P>
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WM_WOM_CLOSE</SPAN></P>
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</SPAN>│<SPAN> </SPAN>↘ </P>
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</SPAN>↓<SPAN> </SPAN>音频输出
设备关闭消息</P></DIV>
<P style="TEXT-ALIGN: center" align=center><SPAN>6.2
</SPAN>播放过程消息</P>
<P> 在打开音频输入或输出设备消息处理中，可对一些变量进行初始化；在<SPAN>WM_WIM_CLOSE</SPAN>消息的处理中主要是调用<SPAN>WaveInUnprepareHeader</SPAN>释放输入设备对应的缓存和其他资源；在<SPAN>WOM_CLOSE</SPAN>消息的处理中主要是调用<SPAN>WaveOutUnprepareHeader</SPAN>释放输出设备对应的缓存和其他资源；在<SPAN>WM_WIM_DATA</SPAN>消息处理中，处理完录入的数据后需要重新为输入设备添加缓冲；在<SPAN>WM_WIM_DATA</SPAN>消息处理中，首先清空已经播放的数据，调整循环队列中接收音频指针和播放音频指针，然后从该队列中拷贝数据到输出缓存中。</P>
<H1><A id=_Toc162973511 name=_Toc162973511><SPAN>7 </SPAN>程序结构</A></H1>
<P> 系统的功能是实现在局域网内的点对点实时音频通信。音频的网络传输采用<SPAN>UDP</SPAN>方式。</P>
<P> 程序中为输入设备准备了两块缓冲，输出设备的缓冲块数可以通过修改宏进行调整，但至少是两块。程序使用多线程技术实现声音的采集发送和接收播放。总体结构如下所示：</P>
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</SPAN>程序启动</P>
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</SPAN>↓</P>
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</SPAN>设置音频属性</P>
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</SPAN>│</P>
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</SPAN>↙<SPAN> </SPAN>↘</P>
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</SPAN>启动录音 <SPAN> </SPAN>启动音频包接收</P>
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</SPAN>↓<SPAN>
</SPAN>↓</P>
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</SPAN>发送音频包
<SPAN> </SPAN>启动播放</P></DIV>
<P style="TEXT-ALIGN: center" align=center><SPAN>7.1
</SPAN>总体结构图</P>
<P> 程序总体结构很简单，大体可以分为两部分：一是录音和发送，二是接收和播放。</P>
<P>（一） 录音发送部分的流程如下：</P>
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</SPAN>打开音频输入设备（录音）</P>
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</SPAN>↓</P>
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</SPAN>为输入设备准备两块缓存</P>
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</SPAN>↓</P>
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</SPAN>启动录音</P>
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</SPAN>│</P>
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</SPAN>┌─────────────→│</P>
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</SPAN>│<SPAN>
</SPAN>↙ ↘</P>
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</SPAN>│<SPAN>
</SPAN>捕捉到消息：<SPAN>WM_WIM_DATA</SPAN><SPAN>
</SPAN>捕捉到消息：<SPAN>WM_WIM_CLOSE</SPAN></P>
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</SPAN>│<SPAN>
</SPAN>↓<SPAN>
</SPAN>↓</P>
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</SPAN>│<SPAN>
</SPAN>对已录数据进行<SPAN>G721</SPAN>编码<SPAN>
</SPAN>释放输入设备所有缓存</P>
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</SPAN>│<SPAN>
</SPAN>↓<SPAN>
</SPAN>↓</P>
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</SPAN>│<SPAN>
</SPAN>发送编码后数据<SPAN>
</SPAN>关闭音频输入设备，结束</P>
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</SPAN>│<SPAN>
</SPAN>↓</P>
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</SPAN>│ <SPAN> </SPAN>为输入设备重新指定缓存</P>
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</SPAN>│<SPAN>
</SPAN>│</P>
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</SPAN>└───────┘</P></DIV>
<P style="TEXT-ALIGN: center" align=center><SPAN>7.2
</SPAN>录音及发送流程图</P>
<P> 部分源码：</P>
<P><SPAN>1</SPAN>）打开音频输入设备源码为：</P>
<DIV
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<P class=SourceCode><SPAN>waveInOpen(&hWaveIn,</SPAN></P>
<P class=SourceCode><SPAN> WAVE_MAPPER,</SPAN></P>
<P
class=SourceCode><SPAN> &m_waveformin,</SPAN></P>
<P
class=SourceCode><SPAN> (DWORD)waveInProc,</SPAN></P>
<P class=SourceCode><SPAN> NULL,</SPAN></P>
<P
class=SourceCode><SPAN> CALLBACK_FUNCTION);</SPAN></P></DIV>
<P> 其中，<SPAN>hWaveIn</SPAN>为音频输入句柄，<SPAN>WAVE_MAPPER</SPAN>表示让系统选择录音的声卡，<SPAN>m_waveformin</SPAN>是音频格式，<SPAN>waveInProc</SPAN>是消息处理函数名，<SPAN>CALLBACK_FUNCTION</SPAN>表示以函数调用的方式处理响应录音过程中的消息。</P>
<P><SPAN>2</SPAN>）为输入设备添加缓冲的源码为：</P>
<DIV
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<P class=SourceCode><SPAN>//
</SPAN>为音频输入准备两个缓存<SPAN>:pBuffer1,pBuffer2</SPAN>，大小为<SPAN>BUFFER_SIZE</SPAN>。</P>
<P class=SourceCode><SPAN>// hWaveIn</SPAN>为音频输入句柄</P>
<P
class=SourceCode><SPAN>pWaveHdr1->lpData &⌨️ 快捷键说明
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