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<a name="l00151"></a>00151 }<a name="l00152"></a>00152 <a name="l00153"></a>00153 <a name="l00154"></a><a class="code" href="classG711.html#e3">00154</a> <a class="code" href="common_8h.html#a2">EXPORT</a> <span class="keywordtype">int</span> <a class="code" href="classG711.html#e3">G711::ULawDecode</a>(<a class="code" href="group__integers.html#ga0">uint8</a> ulaw)<a name="l00155"></a>00155 {<a name="l00156"></a>00156 ulaw ^= 0xff; <span class="comment">// u-law has all bits inverted for transmission</span><a name="l00157"></a>00157 <a name="l00158"></a>00158 <span class="keywordtype">int</span> linear = ulaw&0x0f;<a name="l00159"></a>00159 linear <<= 3;<a name="l00160"></a>00160 linear |= 0x84; <span class="comment">// Set MSB (0x80) and a 'half' bit (0x04) to place PCM value in middle of range</span><a name="l00161"></a>00161 <a name="l00162"></a>00162 <a class="code" href="group__integers.html#ga6">uint</a> shift = ulaw>>4;<a name="l00163"></a>00163 shift &= 7;<a name="l00164"></a>00164 linear <<= shift;<a name="l00165"></a>00165 <a name="l00166"></a>00166 linear -= 0x84; <span class="comment">// Subract uLaw bias</span><a name="l00167"></a>00167 <a name="l00168"></a>00168 <span class="keywordflow">if</span>(ulaw&0x80)<a name="l00169"></a>00169 <span class="keywordflow">return</span> -linear;<a name="l00170"></a>00170 <span class="keywordflow">else</span><a name="l00171"></a>00171 <span class="keywordflow">return</span> linear;<a name="l00172"></a>00172 }<a name="l00173"></a>00173 <a name="l00174"></a>00174 <a name="l00175"></a><a class="code" href="classG711.html#e4">00175</a> <a class="code" href="common_8h.html#a2">EXPORT</a> <a class="code" href="group__integers.html#ga0">uint8</a> <a class="code" href="classG711.html#e4">G711::ALawToULaw</a>(<a class="code" href="group__integers.html#ga0">uint8</a> alaw)<a name="l00176"></a>00176 {<a name="l00177"></a>00177 <a class="code" href="group__integers.html#ga0">uint8</a> sign=alaw&0x80;<a name="l00178"></a>00178 alaw ^= sign;<a name="l00179"></a>00179 alaw ^= 0x55;<a name="l00180"></a>00180 <a class="code" href="group__integers.html#ga6">uint</a> ulaw;<a name="l00181"></a>00181 <span class="keywordflow">if</span>(alaw<45)<a name="l00182"></a>00182 {<a name="l00183"></a>00183 <span class="keywordflow">if</span>(alaw<24)<a name="l00184"></a>00184 ulaw = (alaw<8) ? (alaw<<1)+1 : alaw+8;<a name="l00185"></a>00185 <span class="keywordflow">else</span><a name="l00186"></a>00186 ulaw = (alaw<32) ? (alaw>>1)+20 : alaw+4;<a name="l00187"></a>00187 }<a name="l00188"></a>00188 <span class="keywordflow">else</span><a name="l00189"></a>00189 {<a name="l00190"></a>00190 <span class="keywordflow">if</span>(alaw<63)<a name="l00191"></a>00191 ulaw = (alaw<47) ? alaw+3 : alaw+2;<a name="l00192"></a>00192 <span class="keywordflow">else</span><a name="l00193"></a>00193 ulaw = (alaw<79) ? alaw+1 : alaw;<a name="l00194"></a>00194 }<a name="l00195"></a>00195 ulaw ^= sign;<a name="l00196"></a>00196 <span class="keywordflow">return</span> ulaw^0x7f;<a name="l00197"></a>00197 }<a name="l00198"></a>00198 <a name="l00199"></a>00199 <a name="l00200"></a><a class="code" href="classG711.html#e5">00200</a> <a class="code" href="common_8h.html#a2">EXPORT</a> <a class="code" href="group__integers.html#ga0">uint8</a> <a class="code" href="classG711.html#e5">G711::ULawToALaw</a>(<a class="code" href="group__integers.html#ga0">uint8</a> ulaw)<a name="l00201"></a>00201 {<a name="l00202"></a>00202 <a class="code" href="group__integers.html#ga0">uint8</a> sign=ulaw&0x80;<a name="l00203"></a>00203 ulaw ^= sign;<a name="l00204"></a>00204 ulaw ^= 0x7f;<a name="l00205"></a>00205 <a class="code" href="group__integers.html#ga6">uint</a> alaw;<a name="l00206"></a>00206 <span class="keywordflow">if</span>(ulaw<48)<a name="l00207"></a>00207 {<a name="l00208"></a>00208 <span class="keywordflow">if</span>(ulaw<=32)<a name="l00209"></a>00209 alaw = (ulaw<=15) ? ulaw>>1 : ulaw-8;<a name="l00210"></a>00210 <span class="keywordflow">else</span><a name="l00211"></a>00211 alaw = (ulaw<=35) ? (ulaw<<1)-40 : ulaw-4;<a name="l00212"></a>00212 }<a name="l00213"></a>00213 <span class="keywordflow">else</span><a name="l00214"></a>00214 {<a name="l00215"></a>00215 <span class="keywordflow">if</span>(ulaw<=63)<a name="l00216"></a>00216 alaw = (ulaw==48) ? ulaw-3 : ulaw-2;<a name="l00217"></a>00217 <span class="keywordflow">else</span><a name="l00218"></a>00218 alaw = (ulaw<=79) ? ulaw-1 : ulaw;<a name="l00219"></a>00219 }<a name="l00220"></a>00220 alaw ^= sign;<a name="l00221"></a>00221 <span class="keywordflow">return</span> alaw^0x55;<a name="l00222"></a>00222 }<a name="l00223"></a>00223 <a name="l00224"></a>00224 <a name="l00225"></a><a class="code" href="classG711.html#e6">00225</a> <a class="code" href="common_8h.html#a2">EXPORT</a> <a class="code" href="group__integers.html#ga6">uint</a> <a class="code" href="classG711.html#e0">G711::ALawEncode</a>(<a class="code" href="group__integers.html#ga0">uint8</a>* dst, <a class="code" href="group__integers.html#ga4">int16</a>* src, <a class="code" href="group__integers.html#ga6">uint</a> srcSize)<a name="l00226"></a>00226 {<a name="l00227"></a>00227 srcSize >>= 1;<a name="l00228"></a>00228 <a class="code" href="group__integers.html#ga0">uint8</a>* end = dst+srcSize;<a name="l00229"></a>00229 <span class="keywordflow">while</span>(dst<end)<a name="l00230"></a>00230 *dst++ = <a class="code" href="classG711.html#e0">ALawEncode</a>(*src++);<a name="l00231"></a>00231 <span class="keywordflow">return</span> srcSize;<a name="l00232"></a>00232 }<a name="l00233"></a>00233 <a name="l00234"></a>00234 <a name="l00235"></a><a class="code" href="classG711.html#e7">00235</a> <a class="code" href="common_8h.html#a2">EXPORT</a> <a class="code" href="group__integers.html#ga6">uint</a> <a class="code" href="classG711.html#e1">G711::ALawDecode</a>(<a class="code" href="group__integers.html#ga4">int16</a>* dst, <span class="keyword">const</span> <a class="code" href="group__integers.html#ga0">uint8</a>* src, <a class="code" href="group__integers.html#ga6">uint</a> srcSize)<a name="l00236"></a>00236 {<a name="l00237"></a>00237 <a class="code" href="group__integers.html#ga4">int16</a>* end = dst+srcSize;<a name="l00238"></a>00238 <span class="keywordflow">while</span>(dst<end)<a name="l00239"></a>00239 *dst++ = <a class="code" href="classG711.html#e1">ALawDecode</a>(*src++);<a name="l00240"></a>00240 <span class="keywordflow">return</span> srcSize<<1;<a name="l00241"></a>00241 }<a name="l00242"></a>00242 <a name="l00243"></a>00243 <a name="l00244"></a><a class="code" href="classG711.html#e8">00244</a> <a class="code" href="common_8h.html#a2">EXPORT</a> <a class="code" href="group__integers.html#ga6">uint</a> <a class="code" href="classG711.html#e2">G711::ULawEncode</a>(<a class="code" href="group__integers.html#ga0">uint8</a>* dst, <a class="code" href="group__integers.html#ga4">int16</a>* src, <a class="code" href="group__integers.html#ga6">uint</a> srcSize)<a name="l00245"></a>00245 {<a name="l00246"></a>00246 srcSize >>= 1;<a name="l00247"></a>00247 <a class="code" href="group__integers.html#ga0">uint8</a>* end = dst+srcSize;<a name="l00248"></a>00248 <span class="keywordflow">while</span>(dst<end)<a name="l00249"></a>00249 *dst++ = <a class="code" href="classG711.html#e2">ULawEncode</a>(*src++);<a name="l00250"></a>00250 <span class="keywordflow">return</span> srcSize;<a name="l00251"></a>00251 }<a name="l00252"></a>00252 <a name="l00253"></a>00253 <a name="l00254"></a><a class="code" href="classG711.html#e9">00254</a> <a class="code" href="common_8h.html#a2">EXPORT</a> <a class="code" href="group__integers.html#ga6">uint</a> <a class="code" href="classG711.html#e3">G711::ULawDecode</a>(<a class="code" href="group__integers.html#ga4">int16</a>* dst, <span class="keyword">const</span> <a class="code" href="group__integers.html#ga0">uint8</a>* src, <a class="code" href="group__integers.html#ga6">uint</a> srcSize)<a name="l00255"></a>00255 {<a name="l00256"></a>00256 <a class="code" href="group__integers.html#ga4">int16</a>* end = dst+srcSize;<a name="l00257"></a>00257 <span class="keywordflow">while</span>(dst<end)<a name="l00258"></a>00258 *dst++ = <a class="code" href="classG711.html#e3">ULawDecode</a>(*src++);<a name="l00259"></a>00259 <span class="keywordflow">return</span> srcSize<<1;<a name="l00260"></a>00260 }<a name="l00261"></a>00261 <a name="l00262"></a>00262 <a name="l00263"></a><a class="code" href="classG711.html#e10">00263</a> <a class="code" href="common_8h.html#a2">EXPORT</a> <a class="code" href="group__integers.html#ga6">uint</a> <a class="code" href="classG711.html#e4">G711::ALawToULaw</a>(<a class="code" href="group__integers.html#ga0">uint8</a>* dst, <span class="keyword">const</span> <a class="code" href="group__integers.html#ga0">uint8</a>* src, <a class="code" href="group__integers.html#ga6">uint</a> srcSize)<a name="l00264"></a>00264 {<a name="l00265"></a>00265 <a class="code" href="group__integers.html#ga0">uint8</a>* end = dst+srcSize;<a name="l00266"></a>00266 <span class="keywordflow">while</span>(dst<end)<a name="l00267"></a>00267 *dst++ = <a class="code" href="classG711.html#e4">ALawToULaw</a>(*src++);<a name="l00268"></a>00268 <span class="keywordflow">return</span> srcSize;<a name="l00269"></a>00269 }<a name="l00270"></a>00270 <a name="l00271"></a>00271 <a name="l00272"></a><a class="code" href="classG711.html#e11">00272</a> <a class="code" href="common_8h.html#a2">EXPORT</a> <a class="code" href="group__integers.html#ga6">uint</a> <a class="code" href="classG711.html#e5">G711::ULawToALaw</a>(<a class="code" href="group__integers.html#ga0">uint8</a>* dst, <span class="keyword">const</span> <a class="code" href="group__integers.html#ga0">uint8</a>* src, <a class="code" href="group__integers.html#ga6">uint</a> srcSize)<a name="l00273"></a>00273 {<a name="l00274"></a>00274 <a class="code" href="group__integers.html#ga0">uint8</a>* end = dst+srcSize;<a name="l00275"></a>00275 <span class="keywordflow">while</span>(dst<end)<a name="l00276"></a>00276 *dst++ = <a class="code" href="classG711.html#e5">ULawToALaw</a>(*src++);<a name="l00277"></a>00277 <span class="keywordflow">return</span> srcSize;<a name="l00278"></a>00278 }</pre></div><HR><ADDRESS STYLE="align: right;"><SMALL>Generated by <A HREF="http://www.doxygen.org/index.html"><IMG SRC="doxygen.png" ALT="doxygen" ALIGN="middle" BORDER="0"></A> 1.4.4</SMALL></ADDRESS></BODY></HTML>⌨️ 快捷键说明
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