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annotate jmixtmpl_c.h @ 139:111f3e4b57ad

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Improve volume ramping functionality to allow arbitrary length ramps.
author Matti Hamalainen <ccr@tnsp.org>
date Fri, 05 Oct 2012 09:25:59 +0300
parents 1ba202b448e0
children 301de8c0cd01
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1 /*
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2 * miniJSS - Mixing routine in C, innerloop template
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3 * Programmed and designed by Matti 'ccr' Hamalainen
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4 * (C) Copyright 2006-2007 Tecnic Software productions (TNSP)
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5 */
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6
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7 #ifdef JMIXER_HEADER
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8 int JMIXER_NAME (JSSMixer *, JSSChannel *, JMIXER_ADDBUF_TYPE *, const int, const Sint32);
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9 #else
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10 int JMIXER_NAME (JSSMixer *mixer, JSSChannel *chn, JMIXER_ADDBUF_TYPE *addBuffer, const int mixLength, const Sint32 endPos)
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11 {
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12 const DMFixedPoint tmpDelta = chn->chDeltaO, tmpDeltaV = chn->chDeltaV;
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13 DMFixedPoint tmpPos = chn->chPos, tmpVolume = chn->chVolume;
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14 JMIXER_ADDBUF_TYPE
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15 *ap = addBuffer,
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16 *tr = chn->chPrevR,
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17 *tl = chn->chPrevL;
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18 int strideLength = 0, tmpVolumeD = chn->chVolumeD;;
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19
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20 JMIXER_SAMPLE_TYPE *sp = (JMIXER_SAMPLE_TYPE *) chn->chData;
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22 JMIXER_INIT
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23
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24 while (strideLength < mixLength && JMIXER_ENDCOND)
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25 {
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26 JMIXER_FUNC
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27 JMIXER_DEBUG
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28 JMIXER_NEXT
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29 if (tmpVolumeD)
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30 {
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31 tmpVolumeD--;
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32 FP_ADD(tmpVolume, tmpDeltaV);
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33 }
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34 strideLength++;
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35 }
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37 chn->chPos = tmpPos;
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38 chn->chVolume = tmpVolume;
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39 chn->chVolumeD = tmpVolumeD;
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40 return strideLength;
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41 }
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42 #endif
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44 #undef JMIXER_NAME
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45 #undef JMIXER_NEXT
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46 #undef JMIXER_ENDCOND
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