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<a href="#func-members">Functions</a> </div>
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<div class="headertitle"><div class="title">DCT4 F32<div class="ingroups"><a class="el" href="group__groupTransforms.html">Transform Functions</a> » <a class="el" href="group__DCT4__IDCT4.html">DCT Type IV Functions</a></div></div></div>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="func-members" name="func-members"></a>
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Functions</h2></td></tr>
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<tr class="memitem:gafd538d68886848bc090ec2b0d364cc81"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4F32.html#gafd538d68886848bc090ec2b0d364cc81">arm_dct4_f32</a> (const <a class="el" href="structarm__dct4__instance__f32.html">arm_dct4_instance_f32</a> *S, <a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *pState, <a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *pInlineBuffer)</td></tr>
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<tr class="memdesc:gafd538d68886848bc090ec2b0d364cc81"><td class="mdescLeft"> </td><td class="mdescRight">Processing function for the floating-point DCT4/IDCT4. <a href="group__DCT4F32.html#gafd538d68886848bc090ec2b0d364cc81">More...</a><br /></td></tr>
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<tr class="separator:gafd538d68886848bc090ec2b0d364cc81"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gab094ad3bc6fa1b84e8b12a24e1850a06"><td class="memItemLeft" align="right" valign="top"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DCT4F32.html#gab094ad3bc6fa1b84e8b12a24e1850a06">arm_dct4_init_f32</a> (<a class="el" href="structarm__dct4__instance__f32.html">arm_dct4_instance_f32</a> *S, <a class="el" href="structarm__rfft__instance__f32.html">arm_rfft_instance_f32</a> *S_RFFT, <a class="el" href="structarm__cfft__radix4__instance__f32.html">arm_cfft_radix4_instance_f32</a> *S_CFFT, uint16_t N, uint16_t Nby2, <a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> normalize)</td></tr>
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<tr class="memdesc:gab094ad3bc6fa1b84e8b12a24e1850a06"><td class="mdescLeft"> </td><td class="mdescRight">Initialization function for the floating-point DCT4/IDCT4. <a href="group__DCT4F32.html#gab094ad3bc6fa1b84e8b12a24e1850a06">More...</a><br /></td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Description</h2>
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<h2 class="groupheader">Function Documentation</h2>
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<a id="gafd538d68886848bc090ec2b0d364cc81" name="gafd538d68886848bc090ec2b0d364cc81"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#gafd538d68886848bc090ec2b0d364cc81">◆ </a></span>arm_dct4_f32()</h2>
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<div class="memitem">
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<td class="memname">void arm_dct4_f32 </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="structarm__dct4__instance__f32.html">arm_dct4_instance_f32</a> * </td>
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<td class="paramname"><em>S</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> * </td>
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<td class="paramname"><em>pState</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> * </td>
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<td class="paramname"><em>pInlineBuffer</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000020">Deprecated:</a></b></dt><dd>Do not use this function. It is using a deprecated version of the RFFT. </dd></dl>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[in]</td><td class="paramname">S</td><td>points to an instance of the floating-point DCT4/IDCT4 structure </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">pState</td><td>points to state buffer </td></tr>
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<tr><td class="paramdir">[in,out]</td><td class="paramname">pInlineBuffer</td><td>points to the in-place input and output buffer </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>none </dd></dl>
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</div>
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</div>
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<a id="gab094ad3bc6fa1b84e8b12a24e1850a06" name="gab094ad3bc6fa1b84e8b12a24e1850a06"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#gab094ad3bc6fa1b84e8b12a24e1850a06">◆ </a></span>arm_dct4_init_f32()</h2>
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<div class="memitem">
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<tr>
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<td class="memname"><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> arm_dct4_init_f32 </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="structarm__dct4__instance__f32.html">arm_dct4_instance_f32</a> * </td>
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<td class="paramname"><em>S</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="structarm__rfft__instance__f32.html">arm_rfft_instance_f32</a> * </td>
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<td class="paramname"><em>S_RFFT</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="structarm__cfft__radix4__instance__f32.html">arm_cfft_radix4_instance_f32</a> * </td>
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<td class="paramname"><em>S_CFFT</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint16_t </td>
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<td class="paramname"><em>N</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint16_t </td>
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<td class="paramname"><em>Nby2</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> </td>
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<td class="paramname"><em>normalize</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000021">Deprecated:</a></b></dt><dd>Do not use this function. It is using a deprecated version of the RFFT. </dd></dl>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[in,out]</td><td class="paramname">S</td><td>points to an instance of floating-point DCT4/IDCT4 structure </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">S_RFFT</td><td>points to an instance of floating-point RFFT/RIFFT structure </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">S_CFFT</td><td>points to an instance of floating-point CFFT/CIFFT structure </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">N</td><td>length of the DCT4 </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">Nby2</td><td>half of the length of the DCT4 </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">normalize</td><td>normalizing factor. </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>execution status<ul>
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<li><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a9f8b2a10bd827fb4600e77d455902eb0">ARM_MATH_SUCCESS</a> : Operation successful</li>
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<li><a class="el" href="arm__math__types_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a74897e18d4b8f62b12a7d8a01dd2bb35">ARM_MATH_ARGUMENT_ERROR</a> : <code>N</code> is not a supported transform length</li>
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</ul>
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</dd></dl>
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<dl class="section user"><dt>Normalizing factor</dt><dd>The normalizing factor is <code>sqrt(2/N)</code>, which depends on the size of transform <code>N</code>. Floating-point normalizing factors are mentioned in the table below for different DCT sizes:</dd></dl>
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<table class="markdownTable">
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<tr class="markdownTableHead">
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<th class="markdownTableHeadRight">DCT Size </th><th class="markdownTableHeadRight">Normalizing factor value </th></tr>
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<tr class="markdownTableRowOdd">
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<td class="markdownTableBodyRight">2048 </td><td class="markdownTableBodyRight">0.03125 </td></tr>
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<tr class="markdownTableRowEven">
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<td class="markdownTableBodyRight">512 </td><td class="markdownTableBodyRight">0.0625 </td></tr>
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<tr class="markdownTableRowOdd">
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<td class="markdownTableBodyRight">128 </td><td class="markdownTableBodyRight">0.125 </td></tr>
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</table>
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