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<li class="toctree-l3"><a class="reference internal" href="loggrad.html">LogGrad</a></li>
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<li class="toctree-l3"><a class="reference internal" href="lstmgrad.html">LstmGrad</a></li>
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<li class="toctree-l3"><a class="reference internal" href="maxpoolgrad.html">MaxPoolGrad</a></li>
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<li class="toctree-l3"><a class="reference internal" href="random_normal.html">RandomNormal</a></li>
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<li class="toctree-l3"><a class="reference internal" href="random_standard_normal.html">RandomStandardNormal</a></li>
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<li class="toctree-l3"><a class="reference internal" href="range.html">Range</a></li>
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<li class="toctree-l3"><a class="reference internal" href="reduce.html">Reduce</a></li>
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<li class="toctree-l3"><a class="reference internal" href="resizegrad.html">Resizegrad</a></li>
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<li class="toctree-l3 current"><a class="current reference internal" href="#">RFFT</a></li>
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<li class="toctree-l3"><a class="reference internal" href="round.html">Round</a></li>
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<li class="toctree-l3"><a class="reference internal" href="sgd.html">SGD</a></li>
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<li class="toctree-l3"><a class="reference internal" href="shape.html">Shape</a></li>
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<li class="toctree-l3"><a class="reference internal" href="sigmoidcrossentropywithlogits.html">SigmoidCrossEntropyWithLogits</a></li>
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<li class="breadcrumb-item"><a href="dsplib_index.html">DSP Library C API Reference</a></li>
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<li class="breadcrumb-item active">RFFT</li>
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<a href="../../_sources/functionlib/dsplib/rfft.rst.txt" rel="nofollow"> 查看页面源码</a>
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<section id="rfft">
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<h1>RFFT<a class="headerlink" href="#rfft" title="此标题的永久链接"></a></h1>
|
||
<p>对输入复数序列执行一维快速傅里叶变换（FFT）或逆变换（IFFT）。
|
||
内部基于分治 FFT 算法，
|
||
并使用预计算旋转因子（twiddle factor）以提升性能。
|
||
傅里叶变换，可以对参数进行调整，以实现FFT/IFFT/RFFT/IRFFT。</p>
|
||
<p>数学定义如下：</p>
|
||
<div class="math notranslate nohighlight">
|
||
\[X(k) = \sum_{n=0}^{N-1} x(n)\,e^{-j 2\pi kn / N} \quad (\text{Forward FFT})\]</div>
|
||
<div class="math notranslate nohighlight">
|
||
\[x(n) = \sum_{k=0}^{N-1} X(k)\,e^{j 2\pi kn / N} \quad (\text{Inverse FFT})\]</div>
|
||
<p>其中 <span class="math notranslate nohighlight">\(N\)</span> 为 FFT 点数。</p>
|
||
<dl class="simple">
|
||
<dt>输入：</dt><dd><ul class="simple">
|
||
<li><p><strong>input</strong> - 输入复数数据地址。</p></li>
|
||
<li><p><strong>fft_size</strong> - FFT 点数。</p></li>
|
||
<li><dl class="simple">
|
||
<dt><strong>dir</strong> - 变换方向：</dt><dd><ul>
|
||
<li><p><code class="docutils literal notranslate"><span class="pre">FFT_FORWARD</span></code>：正向 FFT</p></li>
|
||
<li><p><code class="docutils literal notranslate"><span class="pre">FFT_INVERSE</span></code>：反向 FFT</p></li>
|
||
</ul>
|
||
</dd>
|
||
</dl>
|
||
</li>
|
||
<li><p><strong>scratch_ptr</strong> - 临时缓冲区地址，用于存放旋转因子及中间计算结果。</p></li>
|
||
<li><p><strong>twiddle</strong> - 旋转因子地址（仅共享存储版本使用）。</p></li>
|
||
<li><p><strong>fft_size1</strong> - 第一阶段 FFT 点数（仅共享存储版本使用）。</p></li>
|
||
<li><p><strong>fft_size2</strong> - 第二阶段 FFT 点数（仅共享存储版本使用）。</p></li>
|
||
<li><p><strong>core_mask</strong> - 核掩码（仅共享存储版本需要）。</p></li>
|
||
</ul>
|
||
</dd>
|
||
<dt>输出：</dt><dd><ul class="simple">
|
||
<li><p><strong>output</strong> - 输出复数序列地址。</p></li>
|
||
</ul>
|
||
</dd>
|
||
</dl>
|
||
<p>内部核心计算公式如下：
|
||
对于FFT，它计算以下表达式：</p>
|
||
<div class="math notranslate nohighlight">
|
||
\[X[\omega_1, \dots, \omega_d] =
|
||
\sum_{n_1=0}^{N_1-1} \dots \sum_{n_d=0}^{N_d-1} x[n_1, \dots, n_d]
|
||
e^{-j\ 2 \pi \sum_{i=0}^d \frac{\omega_i n_i}{N_i}},\]</div>
|
||
<p>其中， <span class="math notranslate nohighlight">\(d\)</span> = <cite>signal_ndim</cite> 是信号的维度，<span class="math notranslate nohighlight">\(N_i\)</span> 则是信号第 <span class="math notranslate nohighlight">\(i\)</span> 个维度的大小。</p>
|
||
<p>对于IFFT，它计算以下表达式：</p>
|
||
<div class="math notranslate nohighlight">
|
||
\[X[\omega_1, \dots, \omega_d] =
|
||
\frac{1}{\prod_{i=1}^d N_i} \sum_{n_1=0}^{N_1-1} \dots \sum_{n_d=0}^{N_d-1} x[n_1, \dots, n_d]
|
||
e^{\ j\ 2 \pi \sum_{i=0}^d \frac{\omega_i n_i}{N_i}},\]</div>
|
||
<p>其中， <span class="math notranslate nohighlight">\(d\)</span> = <cite>signal_ndim</cite> 是信号的维度，<span class="math notranslate nohighlight">\(N_i\)</span> 则是信号第 <span class="math notranslate nohighlight">\(i\)</span> 维的大小。</p>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">备注</p>
|
||
<ul class="simple">
|
||
<li><p>FFT/IFFT要求complex64或complex128类型的输入，返回complex64或complex128类型的输出。</p></li>
|
||
<li><p>RFFT要求bool, uint8, int8, int16, int32, int64, float32或float64类型的输入，
|
||
返回complex64或complex128类型的输出。</p></li>
|
||
<li><p>IRFFT要求complex64或complex128类型的输入，返回float32或float64类型的输出。</p></li>
|
||
</ul>
|
||
</div>
|
||
<dl class="simple">
|
||
<dt>参数：</dt><dd><ul class="simple">
|
||
<li><p><strong>signal_ndim</strong> (int) - 表示每个信号中的维数，控制着傅里叶变换的维数，其值只能为1、2或3。</p></li>
|
||
<li><p><strong>inverse</strong> (bool) - 表示该操作是否为逆变换，用以选择FFT 和 RFFT 或 IFFT 和 IRFFT。</p>
|
||
<ul>
|
||
<li><p>如果为 <code class="docutils literal notranslate"><span class="pre">True</span></code> ，则为IFFT 和 IRFFT。</p></li>
|
||
<li><p>如果为 <code class="docutils literal notranslate"><span class="pre">False</span></code> ，FFT 和 RFFT。</p></li>
|
||
</ul>
|
||
</li>
|
||
<li><p><strong>real</strong> (bool) - 表示该操作是否为实变换，与 <cite>inverse</cite> 共同决定具体的变换模式：</p>
|
||
<ul>
|
||
<li><p><cite>inverse</cite> 为 <code class="docutils literal notranslate"><span class="pre">False</span></code> ， <cite>real</cite> 为 <code class="docutils literal notranslate"><span class="pre">False</span></code> ：对应FFT模式。</p></li>
|
||
<li><p><cite>inverse</cite> 为 <code class="docutils literal notranslate"><span class="pre">True</span></code> ， <cite>real</cite> 为 <code class="docutils literal notranslate"><span class="pre">False</span></code> ：对应IFFT模式。</p></li>
|
||
<li><p><cite>inverse</cite> 为 <code class="docutils literal notranslate"><span class="pre">False</span></code> ， <cite>real</cite> 为 <code class="docutils literal notranslate"><span class="pre">True</span></code> ：对应RFFT模式。</p></li>
|
||
<li><p><cite>inverse</cite> 为 <code class="docutils literal notranslate"><span class="pre">True</span></code> ， <cite>real</cite> 为 <code class="docutils literal notranslate"><span class="pre">True</span></code> ：对应IRFFT模式。</p></li>
|
||
</ul>
|
||
</li>
|
||
<li><p><strong>norm</strong> (str，可选) - 表示该操作的规范化方式，可选值：[ <code class="docutils literal notranslate"><span class="pre">"backward"</span></code> , <code class="docutils literal notranslate"><span class="pre">"forward"</span></code> , <code class="docutils literal notranslate"><span class="pre">"ortho"</span></code> ]。默认值： <code class="docutils literal notranslate"><span class="pre">"backward"</span></code> 。</p>
|
||
<ul>
|
||
<li><p>“backward”，正向变换不缩放，逆变换按 <span class="math notranslate nohighlight">\(1/n\)</span> 缩放，其中 <cite>n</cite> 表示输入 <cite>x</cite> 的元素数量。。</p></li>
|
||
<li><p>“ortho”，正向变换与逆变换均按 <span class="math notranslate nohighlight">\(1/\sqrt n\)</span> 缩放。</p></li>
|
||
<li><p>“forward”，正向变换按 <span class="math notranslate nohighlight">\(1/n\)</span> 缩放，逆变换不缩放。</p></li>
|
||
</ul>
|
||
</li>
|
||
<li><p><strong>onesided</strong> (bool，可选) - 控制输入是否减半以避免冗余。默认值： <code class="docutils literal notranslate"><span class="pre">True</span></code> 。</p></li>
|
||
<li><p><strong>signal_sizes</strong> (tuple，可选) - 原始信号的大小（RFFT变换之前的信号，不包含batch这一维），只有在IRFFT模式下和设置 <cite>onesided</cite> 为True时需要该参数，需要满足
|
||
以下条件。默认值： <code class="docutils literal notranslate"><span class="pre">()</span></code> 。</p>
|
||
<ul>
|
||
<li><p><cite>signal_sizes</cite> 的长度等于IRFFT的 <cite>signal_ndim</cite> ： <span class="math notranslate nohighlight">\(len(signal\_sizes)=signal\_ndim\)</span> 。</p></li>
|
||
<li><p><cite>signal_sizes</cite> 的最后一个维度除以2等于IRFFT输入的最后一个维度： <span class="math notranslate nohighlight">\(signal\_size[-1]/2+1=x.shape[-1]\)</span> 。</p></li>
|
||
<li><p>除了最后一个维度外， <cite>signal_sizes</cite> 的维度与输入shape完全相同： <span class="math notranslate nohighlight">\(signal\_sizes[:-1]=x.shape[:-1]\)</span> 。</p></li>
|
||
</ul>
|
||
</li>
|
||
</ul>
|
||
</dd>
|
||
<dt>异常：</dt><dd><ul class="simple">
|
||
<li><p><strong>TypeError</strong> - 如果FFT/IFFT/IRFF的输入类型不是以下类型之一：complex64、complex128。</p></li>
|
||
<li><p><strong>TypeError</strong> - 如果输入的类型不是Tensor。</p></li>
|
||
<li><p><strong>ValueError</strong> - 如果输入 <cite>x</cite> 的维度小于 <cite>signal_ndim</cite> 。</p></li>
|
||
<li><p><strong>ValueError</strong> - 如果 <cite>signal_ndim</cite> 大于3或小于1。</p></li>
|
||
<li><p><strong>ValueError</strong> - 如果 <cite>norm</cite> 取值不是”backward”、”forward”或”ortho”。</p></li>
|
||
</ul>
|
||
</dd>
|
||
<dt>支持平台：</dt><dd><p><code class="docutils literal notranslate"><span class="pre">FT78NE</span></code>
|
||
<code class="docutils literal notranslate"><span class="pre">MT7004</span></code></p>
|
||
</dd>
|
||
<dt>类型支持：</dt><dd><ul class="simple">
|
||
<li><p>FT78NE：<code class="docutils literal notranslate"><span class="pre">cplx64</span></code>、<code class="docutils literal notranslate"><span class="pre">cplx128</span></code></p></li>
|
||
<li><p>MT7004：<code class="docutils literal notranslate"><span class="pre">cplx64</span></code></p></li>
|
||
</ul>
|
||
</dd>
|
||
</dl>
|
||
<p><strong>共享存储版本:</strong></p>
|
||
<dl class="c function">
|
||
<dt class="sig sig-object c" id="c.c64_rfft_s">
|
||
<span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">c64_rfft_s</span></span></span><span class="sig-paren">(</span><span class="n"><span class="pre">fftw_complex</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">input</span></span>, <span class="n"><span class="pre">fftw_complex</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">output</span></span>, <span class="n"><span class="pre">fftw_complex</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">scratch_ptr</span></span>, <span class="n"><span class="pre">fftw_complex</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">twiddle</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">fft_size1</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">fft_size2</span></span>, <span class="kt"><span class="pre">char</span></span><span class="w"> </span><span class="n"><span class="pre">dir</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">core_mask</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.c64_rfft_s" title="永久链接至目标"></a><br /></dt>
|
||
<dd></dd></dl>
|
||
|
||
<dl class="c function">
|
||
<dt class="sig sig-object c" id="c.c128_rfft_s">
|
||
<span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">c128_rfft_s</span></span></span><span class="sig-paren">(</span><span class="n"><span class="pre">fftw_complex</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">input</span></span>, <span class="n"><span class="pre">fftw_complex</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">output</span></span>, <span class="n"><span class="pre">fftw_complex</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">scratch_ptr</span></span>, <span class="n"><span class="pre">fftw_complex</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">twiddle</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">fft_size1</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">fft_size2</span></span>, <span class="kt"><span class="pre">char</span></span><span class="w"> </span><span class="n"><span class="pre">dir</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">core_mask</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.c128_rfft_s" title="永久链接至目标"></a><br /></dt>
|
||
<dd></dd></dl>
|
||
|
||
<p><strong>C 调用示例：</strong></p>
|
||
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="linenos"> 1</span><span class="c1">// FT78NE 示例（共享存储版本）</span>
|
||
<span class="linenos"> 2</span><span class="cp">#include</span><span class="w"> </span><span class="cpf"><stdio.h></span>
|
||
<span class="linenos"> 3</span><span class="cp">#include</span><span class="w"> </span><span class="cpf"><rfft.h></span>
|
||
<span class="linenos"> 4</span>
|
||
<span class="linenos"> 5</span><span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">argc</span><span class="p">,</span><span class="w"> </span><span class="kt">char</span><span class="o">*</span><span class="w"> </span><span class="n">argv</span><span class="p">[])</span><span class="w"> </span><span class="p">{</span>
|
||
<span class="linenos"> 6</span><span class="w"> </span><span class="n">fftw_complex</span><span class="w"> </span><span class="o">*</span><span class="n">input</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">fftw_complex</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="mh">0xA0000000</span><span class="p">;</span>
|
||
<span class="linenos"> 7</span><span class="w"> </span><span class="n">fftw_complex</span><span class="w"> </span><span class="o">*</span><span class="n">output</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">fftw_complex</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="mh">0xC0000000</span><span class="p">;</span>
|
||
<span class="linenos"> 8</span><span class="w"> </span><span class="n">fftw_complex</span><span class="w"> </span><span class="o">*</span><span class="n">scratch</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">fftw_complex</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="mh">0xA1000000</span><span class="p">;</span>
|
||
<span class="linenos"> 9</span><span class="w"> </span><span class="n">fftw_complex</span><span class="w"> </span><span class="o">*</span><span class="n">twiddle</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">fftw_complex</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="mh">0xA2000000</span><span class="p">;</span>
|
||
<span class="linenos">10</span>
|
||
<span class="linenos">11</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">fft_size1</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">32</span><span class="p">;</span>
|
||
<span class="linenos">12</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">fft_size2</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">32</span><span class="p">;</span>
|
||
<span class="linenos">13</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">core_mask</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mh">0xff</span><span class="p">;</span>
|
||
<span class="linenos">14</span>
|
||
<span class="hll"><span class="linenos">15</span><span class="w"> </span><span class="n">c64_rfft_s</span><span class="p">(</span><span class="n">input</span><span class="p">,</span><span class="w"> </span><span class="n">output</span><span class="p">,</span><span class="w"> </span><span class="n">scratch</span><span class="p">,</span><span class="w"> </span><span class="n">twiddle</span><span class="p">,</span>
|
||
</span><span class="hll"><span class="linenos">16</span><span class="w"> </span><span class="n">fft_size1</span><span class="p">,</span><span class="w"> </span><span class="n">fft_size2</span><span class="p">,</span><span class="w"> </span><span class="n">FFT_FORWARD</span><span class="p">,</span><span class="w"> </span><span class="n">core_mask</span><span class="p">);</span>
|
||
</span><span class="linenos">17</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
|
||
<span class="linenos">18</span><span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
||
<p><strong>私有存储版本:</strong></p>
|
||
<dl class="c function">
|
||
<dt class="sig sig-object c" id="c.c64_rfft_p">
|
||
<span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">c64_rfft_p</span></span></span><span class="sig-paren">(</span><span class="n"><span class="pre">fftw_complex</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">input</span></span>, <span class="n"><span class="pre">fftw_complex</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">output</span></span>, <span class="n"><span class="pre">fftw_complex</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">scratch_ptr</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">fft_size</span></span>, <span class="kt"><span class="pre">char</span></span><span class="w"> </span><span class="n"><span class="pre">dir</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.c64_rfft_p" title="永久链接至目标"></a><br /></dt>
|
||
<dd></dd></dl>
|
||
|
||
<dl class="c function">
|
||
<dt class="sig sig-object c" id="c.c128_rfft_p">
|
||
<span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">c128_rfft_p</span></span></span><span class="sig-paren">(</span><span class="n"><span class="pre">fftw_complex</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">input</span></span>, <span class="n"><span class="pre">fftw_complex</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">output</span></span>, <span class="n"><span class="pre">fftw_complex</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">scratch_ptr</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">fft_size</span></span>, <span class="kt"><span class="pre">char</span></span><span class="w"> </span><span class="n"><span class="pre">dir</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.c128_rfft_p" title="永久链接至目标"></a><br /></dt>
|
||
<dd></dd></dl>
|
||
|
||
<p><strong>C 调用示例：</strong></p>
|
||
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="linenos"> 1</span><span class="c1">// FT78NE 示例（私有存储版本）</span>
|
||
<span class="linenos"> 2</span><span class="cp">#include</span><span class="w"> </span><span class="cpf"><stdio.h></span>
|
||
<span class="linenos"> 3</span><span class="cp">#include</span><span class="w"> </span><span class="cpf"><rfft.h></span>
|
||
<span class="linenos"> 4</span>
|
||
<span class="linenos"> 5</span><span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">argc</span><span class="p">,</span><span class="w"> </span><span class="kt">char</span><span class="o">*</span><span class="w"> </span><span class="n">argv</span><span class="p">[])</span><span class="w"> </span><span class="p">{</span>
|
||
<span class="linenos"> 6</span><span class="w"> </span><span class="n">fftw_complex</span><span class="w"> </span><span class="o">*</span><span class="n">input</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">fftw_complex</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="mh">0x10810000</span><span class="p">;</span>
|
||
<span class="linenos"> 7</span><span class="w"> </span><span class="n">fftw_complex</span><span class="w"> </span><span class="o">*</span><span class="n">output</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">fftw_complex</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="mh">0x10820000</span><span class="p">;</span>
|
||
<span class="linenos"> 8</span><span class="w"> </span><span class="n">fftw_complex</span><span class="w"> </span><span class="o">*</span><span class="n">scratch</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">fftw_complex</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="mh">0x10830000</span><span class="p">;</span>
|
||
<span class="linenos"> 9</span>
|
||
<span class="linenos">10</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">fft_size</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">1024</span><span class="p">;</span>
|
||
<span class="linenos">11</span>
|
||
<span class="hll"><span class="linenos">12</span><span class="w"> </span><span class="n">c64_rfft_p</span><span class="p">(</span><span class="n">input</span><span class="p">,</span><span class="w"> </span><span class="n">output</span><span class="p">,</span><span class="w"> </span><span class="n">scratch</span><span class="p">,</span><span class="w"> </span><span class="n">fft_size</span><span class="p">,</span><span class="w"> </span><span class="n">FFT_FORWARD</span><span class="p">);</span>
|
||
</span><span class="hll"><span class="linenos">13</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
|
||
</span><span class="linenos">14</span><span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
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