classg726.html

这个是关于G.726算法的源程序

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Enumeration used to specify the ADPCM bit-rate.<dl compact><dt><b>Enumerator: </b></dt><dd>
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<tr><td valign="top"><em><a class="anchor" name="w8w3"></a><!-- doxytag: member="Rate16kBits" ref="w8w3" args="" -->Rate16kBits</em>&nbsp;</td><td>
16k bits per second (2 bits per ADPCM sample) </td></tr>
<tr><td valign="top"><em><a class="anchor" name="w8w4"></a><!-- doxytag: member="Rate24kBits" ref="w8w4" args="" -->Rate24kBits</em>&nbsp;</td><td>
24k bits per second (3 bits per ADPCM sample) </td></tr>
<tr><td valign="top"><em><a class="anchor" name="w8w5"></a><!-- doxytag: member="Rate32kBits" ref="w8w5" args="" -->Rate32kBits</em>&nbsp;</td><td>
32k bits per second (4 bits per ADPCM sample) </td></tr>
<tr><td valign="top"><em><a class="anchor" name="w8w6"></a><!-- doxytag: member="Rate40kBits" ref="w8w6" args="" -->Rate40kBits</em>&nbsp;</td><td>
40k bits per second (5 bits per ADPCM sample) </td></tr>
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<p>
Definition at line <a class="el" href="G726_8h-source.html#l00065">65</a> of file <a class="el" href="G726_8h-source.html">G726.h</a>.    </td>
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<hr><h2>Constructor &amp; Destructor Documentation</h2>
<a class="anchor" name="a0"></a><!-- doxytag: member="G726::G726" ref="a0" args="()" --><p>
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          <td class="md" nowrap valign="top">G726::G726           </td>
          <td class="md" valign="top">(&nbsp;</td>
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Contructor which initialises the object to the reset state. <dl compact><dt><b>See also:</b></dt><dd><a class="el" href="classG726.html#a1">Reset()</a> </dd></dl>
<dl compact><dt><b>Since:</b></dt><dd>2005-02-13</dd></dl>

<p>
Definition at line <a class="el" href="G726_8h-source.html#l00077">77</a> of file <a class="el" href="G726_8h-source.html">G726.h</a>.    </td>
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<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="a1"></a><!-- doxytag: member="G726::Reset" ref="a1" args="()" --><p>
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          <td class="md" nowrap valign="top">EXPORT void G726::Reset           </td>
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<p>
Clears the internal state variables to their 'reset' values. Call this function before startings to decode/encode a new audio stream.
<p>
Definition at line <a class="el" href="G726_8cpp-source.html#l01185">1185</a> of file <a class="el" href="G726_8cpp-source.html">G726.cpp</a>.    </td>
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<a class="anchor" name="a2"></a><!-- doxytag: member="G726::SetLaw" ref="a2" args="(Law law)" --><p>
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          <td class="md" nowrap valign="top">EXPORT void G726::SetLaw           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top"><a class="el" href="classG726.html#w7">Law</a>&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>law</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
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<p>
Set the encoding law used for encoder input and decoder output.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign="top"></td><td valign="top"><em>law</em>&nbsp;</td><td>The encoding law.</td></tr>
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<p>
Definition at line <a class="el" href="G726_8cpp-source.html#l01208">1208</a> of file <a class="el" href="G726_8cpp-source.html">G726.cpp</a>.    </td>
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<a class="anchor" name="a3"></a><!-- doxytag: member="G726::SetRate" ref="a3" args="(Rate rate)" --><p>
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          <td class="md" nowrap valign="top">EXPORT void G726::SetRate           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top"><a class="el" href="classG726.html#w8">Rate</a>&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>rate</em>          </td>
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<p>
Set the ADPCM bit-rate used for encoder output and decoder intput.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign="top"></td><td valign="top"><em>rate</em>&nbsp;</td><td>The ADPCM bit-rate.</td></tr>
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<p>
Definition at line <a class="el" href="G726_8cpp-source.html#l01215">1215</a> of file <a class="el" href="G726_8cpp-source.html">G726.cpp</a>.    </td>
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<a class="anchor" name="a4"></a><!-- doxytag: member="G726::Encode" ref="a4" args="(uint pcm)" --><p>
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          <td class="md" nowrap valign="top">EXPORT <a class="el" href="group__integers.html#ga6">uint</a> G726::Encode           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top"><a class="el" href="group__integers.html#ga6">uint</a>&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>pcm</em>          </td>
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<p>
Encodes a single PCM value as an ADPCM value.<p>
<dl compact><dt><b>Precondition:</b></dt><dd>The coding law and ADPCM bit-rate should have been previous initialised with <a class="el" href="classG726.html#a2">SetLaw()</a> and <a class="el" href="classG726.html#a3">SetRate()</a>.</dd></dl>
<dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign="top"></td><td valign="top"><em>pcm</em>&nbsp;</td><td>The PCM value to encode. The bits in this value which lie outside the range of values for the currently set encoding law, are ignored.</td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>The encoded ADPCM value. The number of significant bits in this value are dependant on the bit-rate set by <a class="el" href="classG726.html#a3">SetRate()</a>. Unused bits are set to zero.</dd></dl>

<p>
Definition at line <a class="el" href="G726_8cpp-source.html#l01222">1222</a> of file <a class="el" href="G726_8cpp-source.html">G726.cpp</a>.    </td>
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<a class="anchor" name="a5"></a><!-- doxytag: member="G726::Decode" ref="a5" args="(uint adpcm)" --><p>
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          <td class="md" nowrap valign="top">EXPORT <a class="el" href="group__integers.html#ga6">uint</a> G726::Decode           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top"><a class="el" href="group__integers.html#ga6">uint</a>&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>adpcm</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
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