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<title>Graphic Equalizer: C:/Project Marcel & Oliver/Graphic_Equalizer/src/sample.hcc Source File</title>
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<a class="el" href="dir_000000.html">C:</a> / <a class="el" href="dir_000001.html">Project Marcel & Oliver</a> / <a class="el" href="dir_000002.html">Graphic_Equalizer</a> / <a class="el" href="dir_000004.html">src</a></div>
<h1>sample.hcc</h1><a href="sample_8hcc.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001
00019 <span class="comment">/******** System Includes *************/</span>
00020
00021 <span class="comment">/******** Application Includes ********/</span>
00022 <span class="preprocessor">#include "<a class="code" href="sample_8hch.html">sample.hch</a>"</span>
00023
00024
00025
00026 <span class="comment">/*</span>
00027 <span class="comment"> * Pointer that points towards the current 64 bits samples.</span>
00028 <span class="comment"> */</span>
00029 <span class="keywordtype">signed</span> 16 *audio_in_ptr;
00030
00031 <span class="comment">/*</span>
00032 <span class="comment"> * 64 step counter to keep track of our samples. This is a private variable.</span>
00033 <span class="comment"> */</span>
00034 <span class="keywordtype">unsigned</span> 8 sample_count;
00035
00036
00037
<a name="l00046"></a><a class="code" href="sample_8hcc.html#a2">00046</a> <span class="keywordtype">void</span> <a class="code" href="sample_8hcc.html#a2">sample_add</a>(<span class="keywordtype">signed</span> 16 in_sample) {
00047 <span class="comment">/*</span>
00048 <span class="comment"> * We only sample 64 bits in our buffer, hence we circulate around the</span>
00049 <span class="comment"> * last 6 bits.</span>
00050 <span class="comment"> */</span>
00051 audio_in_ptr[sample_count <-6] = in_sample;
00052 sample_count++;
00053 } <span class="comment">/* --- sample_add() --- */</span>
00054
00055
00056
<a name="l00065"></a><a class="code" href="sample_8hcc.html#a3">00065</a> <span class="keywordtype">void</span> <a class="code" href="sample_8hcc.html#a3">sample_get</a>(<span class="keywordtype">signed</span> 16 *out_sample) {
00066 <span class="comment">/*</span>
00067 <span class="comment"> * We circulate around a 64 bits buffer, therefor we only use the last</span>
00068 <span class="comment"> * 6 bits.</span>
00069 <span class="comment"> */</span>
00070 *out_sample = audio_out_ptr[sample_count <-6];
00071 } <span class="comment">/* --- sample_get() --- */</span>
00072
00073
00074
<a name="l00084"></a><a class="code" href="sample_8hcc.html#a4">00084</a> <span class="keywordtype">unsigned</span> 1 <a class="code" href="sample_8hch.html#a2">sample_rotate_buffers</a>(<span class="keywordtype">void</span>) {
00085 <span class="keywordtype">unsigned</span> 1 retval; <span class="comment">/* store for returnvalue */</span>
00086
00087 retval = 0;
00088 <span class="comment">/*</span>
00089 <span class="comment"> * We only want to read 64 samples, but calculations work nicer if we</span>
00090 <span class="comment"> * use 256 samples. Therefor we circulate our audio pointer around.</span>
00091 <span class="comment"> */</span>
00092 <span class="keywordflow">if</span> (!(sample_count <- 6)) {
00093 <span class="comment">/*</span>
00094 <span class="comment"> * 64 Samples have passed. We are back at '0'. Use the full</span>
00095 <span class="comment"> * sample count as index which is 0 64 128 or 192 and back to</span>
00096 <span class="comment"> * 0. Our Output is only 128 big so we only look at the</span>
00097 <span class="comment"> * 7 LSB. Also, notify the main application that 64 samples</span>
00098 <span class="comment"> * have been processed.</span>
00099 <span class="comment"> */</span>
00100 par {
00101 audio_in_ptr = &pcm_audio_in[sample_count];
00102 audio_out_ptr = &pcm_audio_out[(sample_count <- 7)];
00103 retval = 1;
00104 }
00105 }
00106 } <span class="comment">/* --- sample_rotate_buffers() --- */</span>
</pre></div><hr size="1"><address style="align: right;"><small>Generated on Mon Nov 29 10:53:29 2004 for Graphic Equalizer by
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