⭐ 欢迎来到虫虫下载站！ | 📦 资源下载 📁 资源专辑 ℹ️ 关于我们
⭐ 虫虫下载站
📤 上传资源

📄 book_text15.htm

📁 深入编程内幕vc++ 非常适合处学者学习
💻 HTM
📖 第 1 页 / 共 3 页
字号:
🔍
123 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- saved from url=(0063)http://www1.ustc.edu.cn/personal/csli/insidec++/book_text15.htm -->
<HTML><HEAD><TITLE>Visual C++</TITLE>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
<META content="MSHTML 6.00.2900.2995" name=GENERATOR>
<META content=FrontPage.Editor.Document name=ProgId><LINK 
href="book_text15.files/style.css" type=text/css rel=stylesheet></HEAD>
<BODY bgColor=#f7fbff leftMargin=0 topMargin=0>
<TABLE height="100%" cellSpacing=0 cellPadding=0 width="100%" border=0>
  <TBODY>
  <TR>
    <TD width="3%" background=book_text15.files/page_side.gif 
    height="100%">　</TD>
    <TD vAlign=top align=middle width="97%">
      <P 
      style="mso-line-height-alt: 1.3pt; tab-stops: right dotted 402.1pt"><SPAN 
      lang=EN-US 
      style="FONT-SIZE: 10.5pt; mso-bidi-font-size: 10.0pt"></O:P></SPAN></P>
      <TABLE height=23 width="99%" border=0>
        <TBODY>
        <TR>
          <TD width="2%" height=29></TD>
          <TD width="95%" height=29><PRE><B><FONT color=#000080><A name=_Toc419881661><SPAN style="mso-bookmark: _Toc419740479"><SPAN style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">五 </SPAN><SPAN lang=EN-US style="LAYOUT-GRID-MODE: line">Visual C++</SPAN></SPAN></A><SPAN style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bookmark: _Toc419740479; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">与多媒体</SPAN></FONT></B></PRE></TD>
          <TD width="3%" height=29></TD></TR>
        <TR>
          <TD width="2%" height=15></TD>
          <TD width="95%" height=15>
            <H2 style="mso-line-height-alt: 1.3pt"><A name=_Toc419881662><SPAN 
            lang=EN-US 
            style="FONT-SIZE: 18pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-bookmark: _Toc419740480; mso-hansi-font-family: Arial">1<SPAN 
            style="mso-spacerun: yes">&nbsp; </SPAN>对声音的处理</SPAN></A><SPAN 
            lang=EN-US 
            style="FONT-SIZE: 18pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: Arial"><O:P> 
            </O:P></SPAN></H2>
            <H3 style="mso-line-height-alt: 1.3pt"><A name=_Toc419881664><SPAN 
            lang=EN-US 
            style="FONT-SIZE: 15pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-bookmark: _Toc419740482; mso-hansi-font-family: MS Sans Serif">1．2波形混音器</SPAN></A><SPAN 
            lang=EN-US 
            style="FONT-SIZE: 15pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'"><O:P> 
            </O:P></SPAN></H3>
            <P class=MsoNormal 
            style="WORD-BREAK: break-all; TEXT-INDENT: 20pt; mso-line-height-alt: 1.3pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple"><SPAN 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">假如你是一位游戏爱好者，不知道有没有注意过不同的游戏音乐，音效实现上的区别。比较早的游戏一般采用</SPAN><SPAN 
            lang=EN-US 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">midi加上</SPAN><SPAN 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">单个</SPAN><SPAN 
            lang=EN-US 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">wav</SPAN><SPAN 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">文件的方式，例如《天使帝国》，早期的“三国志”等等，这些游戏一般以</SPAN><SPAN 
            lang=EN-US 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">midi</SPAN><SPAN 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">作背景音乐。遇到人物走路、打架或天灾人祸时用一些波形文件衬托一下气氛，只是</SPAN><SPAN 
            lang=EN-US 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">Midi</SPAN><SPAN 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">文件在早期声卡上表现实在单薄，以一个发烧友的眼光来看实在不堪入耳。后来采用</SPAN><SPAN 
            lang=EN-US 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">CD+</SPAN><SPAN 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">单个</SPAN><SPAN 
            lang=EN-US 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">wav</SPAN><SPAN 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">的声音方式，音质有了明显改善，例如《仙剑奇侠传》。但由于</SPAN><SPAN 
            lang=EN-US 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">wav</SPAN><SPAN 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">在同一时刻只能播放一个，毕竟单薄。很难想象两人打架只有一人发出“嘿嘿”的声音。因此多波形混音成了游戏编程主流，大家看“红色警报”中坦克的轰鸣声，人物的哭叫声，飞机的咆啸声，电塔的滋滋声与出色的背景音乐溶合一起，令人心旷神怡情不自禁。想要编出这样的程序，就要掌握波形混音的原理。<SPAN 
            lang=EN-US><O:P> </O:P></SPAN></SPAN></P>
            <P class=MsoNormal 
            style="WORD-BREAK: break-all; TEXT-INDENT: 1cm; mso-line-height-alt: 1.3pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple"><SPAN 
            lang=EN-US 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">&nbsp;<O:P> 
            </O:P></SPAN></P>
            <P class=MsoNormal 
            style="WORD-BREAK: break-all; mso-line-height-alt: 1.3pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple"><B 
            style="mso-bidi-font-weight: normal"><SPAN 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">什么是</SPAN></B><B 
            style="mso-bidi-font-weight: normal"><SPAN lang=EN-US 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">Wav</SPAN></B><B 
            style="mso-bidi-font-weight: normal"><SPAN 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">文件：<SPAN 
            lang=EN-US><O:P> </O:P></SPAN></SPAN></B></P>
            <P class=MsoNormal 
            style="WORD-BREAK: break-all; TEXT-INDENT: 20pt; mso-line-height-alt: 1.3pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple"><SPAN 
            lang=EN-US 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">Wav</SPAN><SPAN 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">文件直接反映了一个声音在每个时刻的大小值，比如说以下一段波形：</SPAN><SPAN 
            lang=EN-US 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'"><O:P> 
            </O:P></SPAN></P>
            <P class=MsoNormal 
            style="WORD-BREAK: break-all; TEXT-INDENT: 20pt; mso-line-height-alt: 1.3pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple"><!--[if gte vml 1]><O:WRAPBLOCK><V:SHAPETYPE 
            id=_x0000_t75 stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" 
            o:preferrelative="t" o:spt="75" coordsize="21600,21600"><V:STROKE 
            joinstyle="miter" /><V:FORMULAS><V:F 
            eqn="if lineDrawn pixelLineWidth 0" /><V:F eqn="sum @0 1 0" /><V:F 
            eqn="sum 0 0 @1" /><V:F eqn="prod @2 1 2" /><V:F 
            eqn="prod @3 21600 pixelWidth" /><V:F 
            eqn="prod @3 21600 pixelHeight" /><V:F eqn="sum @0 0 1" /><V:F 
            eqn="prod @6 1 2" /><V:F eqn="prod @7 21600 pixelWidth" /><V:F 
            eqn="sum @8 21600 0" /><V:F eqn="prod @7 21600 pixelHeight" /><V:F 
            eqn="sum @10 21600 0" /></V:FORMULAS><V:PATH o:connecttype="rect" 
            gradientshapeok="t" o:extrusionok="f" /><O:LOCK aspectratio="t" 
            v:ext="edit" /></V:SHAPETYPE><V:SHAPE id=_x0000_s1026 
            style="MARGIN-TOP: -9.05pt; Z-INDEX: 1; MARGIN-LEFT: 100pt; WIDTH: 127.85pt; POSITION: absolute; HEIGHT: 58.95pt; mso-position-horizontal-relative: text; mso-position-vertical-relative: text" 
            o:allowincell="f" type="#_x0000_t75"><V:IMAGEDATA o:title="" 
            src="file:///C:/DOCUME~1/ADMINI~1/LOCALS~1/Temp/msoclip1/01/clip_image001.png" 
            /><V:TEXTBOX style="mso-next-textbox: #_x0000_s1026" /><W:WRAP 
            type="topAndBottom" /></V:SHAPE><![if gte mso 9]><o:OLEObject Type="Embed" ProgID="PBrush"  ShapeID="_x0000_s1026" DrawAspect="Content" ObjectID="_1109109049"> </o:OLEObject> <![endif]><![endif]--><SPAN 
            style="mso-ignore: vglayout">
            <TABLE cellSpacing=0 cellPadding=0>
              <TBODY>
              <TR>
                <TD width=133 height=0></TD></TR>
              <TR>
                <TD></TD>
                <TD><IMG height=79 src="book_text15.files/book_t1.gif" 
                  width=171 v:shapes="_x0000_s1026"></TD></TR></TBODY></TABLE></SPAN><!--[if gte vml 1]></O:WRAPBLOCK><![endif]--><BR 
            style="mso-ignore: vglayout" clear=all><SPAN lang=EN-US 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: MS Sans Serif">我们按每人</SPAN><SPAN 
            lang=EN-US 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">0.1</SPAN><SPAN 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">秒取一点，得到的</SPAN><SPAN 
            lang=EN-US 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">wav</SPAN><SPAN 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">文件数值就是</SPAN><SPAN 
            lang=EN-US 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">0,1,1,-1,0,1。</SPAN><SPAN 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">因此，假如我们能把许多</SPAN><SPAN 
            lang=EN-US 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">Wav</SPAN><SPAN 
            style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">文件的数据直接相加，你听到的就是所有的声音，这就是混音器的原理。<SPAN
123

⌨️ 快捷键说明

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -