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<TD align=middle bgColor=#003399 height=16><FONT
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<TD width=500> <SPAN
id=ArticleTitle1_ArticleTitle1_lblKeywords>音频</SPAN></TD></TR>
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<TD align=middle bgColor=#003399 height=16><FONT
color=#ffffff>出处</FONT></TD>
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id=ArticleTitle1_ArticleTitle1_lblSource></SPAN></TD></TR></TBODY></TABLE></TD></TR>
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<P class=MsoNormal><SPAN lang=EN-US>Wave</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">格式音频文件采样率转换</SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一、</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">此转换方法为文件转换方式，需要对现在的文件分析的基础上生成新的音频文件。</SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">二、</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">方法占用时间比较多，但速度在允许范围之内</SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">三、</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分析文件与写入新文件的时候是按字节操作</SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">四、</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">本方法转换生成的新文件的精度只能为</SPAN><SPAN
lang=EN-US>16</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">位，如果需要其他的精度，需要另外进行精度转换。</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">操作流程：</SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一、</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分析源文件的头结构，取得源文件的采样率、声道数、数据长度、数据流量等参数。</SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">二、</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">根据文件头结构生成新文件的头结构，确定各项参数，其中采样率由用户自行指定。</SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">三、</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">根据源文件的采样率与声道数确定转换的循环次数。</SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">四、</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">对源文件的语音数据进行获取与转换，转换公式：</SPAN></P>
<P class=MsoNormal style="TEXT-INDENT: 18pt"><SPAN
lang=EN-US>(((itmp <<8)+itmp)-32768) << 16</SPAN></P>
<P class=MsoNormal style="TEXT-INDENT: 18pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">其中，</SPAN><SPAN
lang=EN-US>itmp</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为取得的双字节数据。</SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">五、</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">将转换后的数据传给需要写入的文件，再次进行转换，公式如下：</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN
lang=EN-US>1</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN
lang=EN-US>c = (((c + 0x80000000) >> 16) & 0xFFFF) ^
0x8000;</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">其中</SPAN><SPAN
lang=EN-US>c</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为传入的采样率数据</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">需要将上面转换的数据进行字节转换，公式如下：</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">第一个字节</SPAN><SPAN
lang=EN-US>c&0xFF</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">第二个字节</SPAN><SPAN
lang=EN-US>c>>8</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">将第一字节与第二字节依次写入新生成的文件</SPAN><SPAN
lang=EN-US>.</SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">六、</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">对源文件与目标文件进行循环操作，只到源文件末尾。</SPAN></P></SPAN><BR>
<DIV
style="FONT-SIZE: 14px; LINE-HEIGHT: 25px"><STRONG>作者Blog：</STRONG><A
id=ArticleContent1_ArticleContent1_AuthorBlogLink
href="http://blog.csdn.net/WhiteCloud/"
target=_blank>http://blog.csdn.net/WhiteCloud/</A></DIV>
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style="FONT-SIZE: 14px; COLOR: #900; LINE-HEIGHT: 25px"><STRONG>相关文章</STRONG></DIV>
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<TD id=white align=middle width=556 bgColor=#006699><FONT
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<TD bgColor=#cccccc colSpan=3><SPAN
style="COLOR: #990000"><IMG height=16 hspace=1 src=""
width=16> </SPAN><SPAN
id=CommnetList1_CommnetList1_rpCommentList__ctl0_lblUserName>sender</SPAN>
<I>( <SPAN
id=CommnetList1_CommnetList1_rpCommentList__ctl0_lblPostTime>2001-08-21</SPAN>)</I>
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<TD width=532 bgColor=#ffffff colSpan=3><SPAN
id=CommnetList1_CommnetList1_rpCommentList__ctl0_lblContent>这种方法保真度太低，连线性插值都比不上。<BR>还是先去看看SOX里面的转换方法吧。</SPAN>
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