libFDK/src/arm/scale_arm.cpp

   1
   2 /* -----------------------------------------------------------------------------------------------------------
   3 Software License for The Fraunhofer FDK AAC Codec Library for Android
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  10 the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
  11 This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
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  75 Fraunhofer Institute for Integrated Circuits IIS
  76 Attention: Audio and Multimedia Departments - FDK AAC LL
  77 Am Wolfsmantel 33
  78 91058 Erlangen, Germany
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  82 ----------------------------------------------------------------------------------------------------------- */
  83
  84 /***************************  Fraunhofer IIS FDK Tools  **********************
  85
  86    Author(s): Arthur Tritthart
  87    Description: Scaling operations for ARM
  88
  89 ******************************************************************************/
  90
  91 /* prevent multiple inclusion with re-definitions */
  92 #ifndef __INCLUDE_SCALE_ARM__
  93 #define __INCLUDE_SCALE_ARM__
  94
  95 #define FUNCTION_scaleValuesWithFactor_DBL
  96
  97 SCALE_INLINE
  98 void scaleValuesWithFactor(
  99         FIXP_DBL *vector,
 100         FIXP_DBL factor,
 101         INT len,
 102         INT scalefactor
 103         )
 104 {
 105   /* This code combines the fMult with the scaling             */
 106   /* It performs a fMultDiv2 and increments shift by 1         */
 107   int shift = scalefactor + 1;
 108   FIXP_DBL *mySpec = vector;
 109
 110   shift = fixmin_I(shift,(INT)DFRACT_BITS-1);
 111
 112   if (shift >= 0)
 113   {
 114     for (int i=0; i<(len>>2); i++)
 115     {
 116       FIXP_DBL tmp0 = mySpec[0];
 117       FIXP_DBL tmp1 = mySpec[1];
 118       FIXP_DBL tmp2 = mySpec[2];
 119       FIXP_DBL tmp3 = mySpec[3];
 120       tmp0 = fMultDiv2(tmp0, factor);
 121       tmp1 = fMultDiv2(tmp1, factor);
 122       tmp2 = fMultDiv2(tmp2, factor);
 123       tmp3 = fMultDiv2(tmp3, factor);
 124       tmp0 <<= shift;
 125       tmp1 <<= shift;
 126       tmp2 <<= shift;
 127       tmp3 <<= shift;
 128       *mySpec++ = tmp0;
 129       *mySpec++ = tmp1;
 130       *mySpec++ = tmp2;
 131       *mySpec++ = tmp3;
 132     }
 133     for (int i=len&3; i--;)
 134     {
 135       FIXP_DBL tmp0 = mySpec[0];
 136       tmp0 = fMultDiv2(tmp0, factor);
 137       tmp0 <<= shift;
 138       *mySpec++ = tmp0;
 139     }
 140   }
 141   else
 142   {
 143     shift = -shift;
 144     for (int i=0; i<(len>>2); i++)
 145     {
 146       FIXP_DBL tmp0 = mySpec[0];
 147       FIXP_DBL tmp1 = mySpec[1];
 148       FIXP_DBL tmp2 = mySpec[2];
 149       FIXP_DBL tmp3 = mySpec[3];
 150       tmp0 = fMultDiv2(tmp0, factor);
 151       tmp1 = fMultDiv2(tmp1, factor);
 152       tmp2 = fMultDiv2(tmp2, factor);
 153       tmp3 = fMultDiv2(tmp3, factor);
 154       tmp0 >>= shift;
 155       tmp1 >>= shift;
 156       tmp2 >>= shift;
 157       tmp3 >>= shift;
 158       *mySpec++ = tmp0;
 159       *mySpec++ = tmp1;
 160       *mySpec++ = tmp2;
 161       *mySpec++ = tmp3;
 162     }
 163     for (int i=len&3; i--;)
 164     {
 165       FIXP_DBL tmp0 = mySpec[0];
 166       tmp0 = fMultDiv2(tmp0, factor);
 167       tmp0 >>= shift;
 168       *mySpec++ = tmp0;
 169     }
 170   }
 171 }
 172
 173 #endif /* #ifndef __INCLUDE_SCALE_ARM__ */