classima__adpcm.html

Tixys source code, include G.711, G.726, IMA-ADPCM etc.

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          <td class="md" nowrap>int&nbsp;</td>
          <td class="mdname" nowrap> <em>dstOffset</em>, </td>
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          <td class="md" nowrap>const <a class="el" href="group__integers.html#ga4">int16</a> *&nbsp;</td>
          <td class="mdname" nowrap> <em>src</em>, </td>
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          <td class="mdname" nowrap> <em>srcSize</em></td>
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<p>
Encode a buffer of 16 bit uniform PCM values into ADPCM values.<p>
Two ADPCM values are stored in each byte. The value stored in bits 0-3 corresponds to the sample preceding that stored in bits 4-7. Note, if the last encoded ADPCM value is stored in bits 0-3, then bits 4-7 will be cleared to zero.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign="top"></td><td valign="top"><em>dst</em>&nbsp;</td><td>Pointer to location to store ADPCM values. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>dstOffset</em>&nbsp;</td><td>Offset from <em>dst</em>, in number-of-bits, at which the decoded values will be stored. I.e. the least significant bit of the first ADPCM value will be stored in byte <div class="fragment"><pre class="fragment">     dst[dstOffset&gt;&gt;3]   
</pre></div> at bit position <div class="fragment"><pre class="fragment">     dstOffset&amp;7         
</pre></div> Where the bit 0 is the least significant bit in a byte and bit 7 is the most significant bit. The value of <em>dstOffset</em> must be a multiple of 4. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>src</em>&nbsp;</td><td>Pointer to the buffer of PCM values to be converted. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>srcSize</em>&nbsp;</td><td>The size, in bytes, of the buffer at <em>src</em>. Must be a multiple of 2.</td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>The number of bits which were stored at dst.</dd></dl>

<p>
Definition at line <a class="el" href="IMA__ADPCM_8cpp-source.html#l00160">160</a> of file <a class="el" href="IMA__ADPCM_8cpp-source.html">IMA_ADPCM.cpp</a>.    </td>
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<a class="anchor" name="a4" doxytag="IMA_ADPCM::Decode"></a><p>
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          <td class="md" nowrap valign="top">EXPORT <a class="el" href="group__integers.html#ga6">uint</a> IMA_ADPCM::Decode           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top"><a class="el" href="group__integers.html#ga4">int16</a> *&nbsp;</td>
          <td class="mdname" nowrap> <em>dst</em>, </td>
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          <td class="md" nowrap>const <a class="el" href="group__integers.html#ga0">uint8</a> *&nbsp;</td>
          <td class="mdname" nowrap> <em>src</em>, </td>
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          <td class="md" nowrap>int&nbsp;</td>
          <td class="mdname" nowrap> <em>srcOffset</em>, </td>
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          <td class="md" nowrap align="right"></td>
          <td class="md"></td>
          <td class="md" nowrap><a class="el" href="group__integers.html#ga6">uint</a>&nbsp;</td>
          <td class="mdname" nowrap> <em>srcSize</em></td>
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          <td class="md">)&nbsp;</td>
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<p>
Decode a buffer of ADPCM values into 16 bit uniform PCM values.<p>
Two ADPCM values are stored in each byte. The value stored in bits 0-3 corresponds to the sample preceding that stored in bits 4-7.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>dst</em>&nbsp;</td><td>Pointer to location to store PCM values. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>src</em>&nbsp;</td><td>Pointer to the buffer of ADPCM values to be converted. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>srcOffset</em>&nbsp;</td><td>Offset from <em>src</em>, in number-of-bits, from which the ADPCM values will be read. I.e. the least significant bit of the first ADPCM value will be read from byte <div class="fragment"><pre class="fragment">     src[srcOffset&gt;&gt;3]   
</pre></div> at bit position <div class="fragment"><pre class="fragment">     srcOffset&amp;7         
</pre></div> Where the bit 0 is the least significant bit in a byte and bit 7 is the most significant bit. The value of <em>srcOffset</em> must be a multiple of 4. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>srcSize</em>&nbsp;</td><td>The number of bits to be read from the buffer at <em>src</em>. Must be a multiple of the size of 4.</td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>The number of bytes which were stored at dst.</dd></dl>

<p>
Definition at line <a class="el" href="IMA__ADPCM_8cpp-source.html#l00197">197</a> of file <a class="el" href="IMA__ADPCM_8cpp-source.html">IMA_ADPCM.cpp</a>.    </td>
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<hr><h2>Member Data Documentation</h2>
<a class="anchor" name="o0" doxytag="IMA_ADPCM::PredictedValue"></a><p>
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          <td class="md" nowrap valign="top"><a class="el" href="group__integers.html#ga4">int16</a> <a class="el" href="classIMA__ADPCM.html#o0">IMA_ADPCM::PredictedValue</a>          </td>
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<p>
The predicted value of the next sample. Typically, this value is read from the header, or written to the header, of a block of ADPCM values.
<p>
Definition at line <a class="el" href="IMA__ADPCM_8h-source.html#l00142">142</a> of file <a class="el" href="IMA__ADPCM_8h-source.html">IMA_ADPCM.h</a>.    </td>
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<a class="anchor" name="o1" doxytag="IMA_ADPCM::StepIndex"></a><p>
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          <td class="md" nowrap valign="top"><a class="el" href="group__integers.html#ga0">uint8</a> <a class="el" href="classIMA__ADPCM.html#o1">IMA_ADPCM::StepIndex</a>          </td>
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<p>
The step index used for the next ADPCM value Typically, this value is read from the header, or written to the header, of a block of ADPCM values.
<p>
Definition at line <a class="el" href="IMA__ADPCM_8h-source.html#l00149">149</a> of file <a class="el" href="IMA__ADPCM_8h-source.html">IMA_ADPCM.h</a>.    </td>
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<hr>The documentation for this class was generated from the following files:<ul>
<li>audio/<a class="el" href="IMA__ADPCM_8h-source.html">IMA_ADPCM.h</a><li>audio/<a class="el" href="IMA__ADPCM_8cpp-source.html">IMA_ADPCM.cpp</a></ul>
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