• 设为首页
  • 点击收藏
  • 手机版
    手机扫一扫访问
    迪恩网络手机版
  • 关注官方公众号
    微信扫一扫关注
    公众号
登陆 注册

C++ C_MUL函数代码示例

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

本文整理汇总了C++中C_MUL函数的典型用法代码示例。如果您正苦于以下问题：C++ C_MUL函数的具体用法？C++ C_MUL怎么用？C++ C_MUL使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。



在下文中一共展示了C_MUL函数的14个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的C++代码示例。

示例1: kf_bfly5

static void kf_bfly5(
        kiss_fft_cpx * Fout,
        const size_t fstride,
        const kiss_fft_cfg st,
        int m
        )
{
    kiss_fft_cpx *Fout0,*Fout1,*Fout2,*Fout3,*Fout4;
    int u;
    kiss_fft_cpx scratch[13];
    kiss_fft_cpx * twiddles = st->twiddles;
    kiss_fft_cpx *tw;
    kiss_fft_cpx ya,yb;
    ya = twiddles[fstride*m];
    yb = twiddles[fstride*2*m];

    Fout0=Fout;
    Fout1=Fout0+m;
    Fout2=Fout0+2*m;
    Fout3=Fout0+3*m;
    Fout4=Fout0+4*m;

    tw=st->twiddles;
    for ( u=0; u<m; ++u ) {
        C_FIXDIV( *Fout0,5); C_FIXDIV( *Fout1,5); C_FIXDIV( *Fout2,5); C_FIXDIV( *Fout3,5); C_FIXDIV( *Fout4,5);
        scratch[0] = *Fout0;

        C_MUL(scratch[1] ,*Fout1, tw[u*fstride]);
        C_MUL(scratch[2] ,*Fout2, tw[2*u*fstride]);
        C_MUL(scratch[3] ,*Fout3, tw[3*u*fstride]);
        C_MUL(scratch[4] ,*Fout4, tw[4*u*fstride]);

        C_ADD( scratch[7],scratch[1],scratch[4]);
        C_SUB( scratch[10],scratch[1],scratch[4]);
        C_ADD( scratch[8],scratch[2],scratch[3]);
        C_SUB( scratch[9],scratch[2],scratch[3]);

        Fout0->r += scratch[7].r + scratch[8].r;
        Fout0->i += scratch[7].i + scratch[8].i;

        scratch[5].r = scratch[0].r + S_MUL(scratch[7].r,ya.r) + S_MUL(scratch[8].r,yb.r);
        scratch[5].i = scratch[0].i + S_MUL(scratch[7].i,ya.r) + S_MUL(scratch[8].i,yb.r);

        scratch[6].r =  S_MUL(scratch[10].i,ya.i) + S_MUL(scratch[9].i,yb.i);
        scratch[6].i = -S_MUL(scratch[10].r,ya.i) - S_MUL(scratch[9].r,yb.i);

        C_SUB(*Fout1,scratch[5],scratch[6]);
        C_ADD(*Fout4,scratch[5],scratch[6]);

        scratch[11].r = scratch[0].r + S_MUL(scratch[7].r,yb.r) + S_MUL(scratch[8].r,ya.r);
        scratch[11].i = scratch[0].i + S_MUL(scratch[7].i,yb.r) + S_MUL(scratch[8].i,ya.r);
        scratch[12].r = - S_MUL(scratch[10].i,yb.i) + S_MUL(scratch[9].i,ya.i);
        scratch[12].i = S_MUL(scratch[10].r,yb.i) - S_MUL(scratch[9].r,ya.i);

        C_ADD(*Fout2,scratch[11],scratch[12]);
        C_SUB(*Fout3,scratch[11],scratch[12]);

        ++Fout0;++Fout1;++Fout2;++Fout3;++Fout4;
    }
}
开发者ID:Arcko，项目名称:xbmc，代码行数:60，代码来源:kiss_fft.c


示例2: kf_bfly3

static void kf_bfly3(
                     kiss_fft_cpx * Fout,
                     const size_t fstride,
                     const kiss_fft_state *st,
                     int m,
                     int N,
                     int mm
                    )
{
   int i;
   size_t k;
   const size_t m2 = 2*m;
   const kiss_twiddle_cpx *tw1,*tw2;
   kiss_fft_cpx scratch[5];
   kiss_twiddle_cpx epi3;

   kiss_fft_cpx * Fout_beg = Fout;
#ifdef FIXED_POINT
   /*epi3.r = -16384;*/ /* Unused */
   epi3.i = -28378;
#else
   epi3 = st->twiddles[fstride*m];
#endif
   for (i=0;i<N;i++)
   {
      Fout = Fout_beg + i*mm;
      tw1=tw2=st->twiddles;
      /* For non-custom modes, m is guaranteed to be a multiple of 4. */
      k=m;
      do {

         C_MUL(scratch[1],Fout[m] , *tw1);
         C_MUL(scratch[2],Fout[m2] , *tw2);

         C_ADD(scratch[3],scratch[1],scratch[2]);
         C_SUB(scratch[0],scratch[1],scratch[2]);
         tw1 += fstride;
         tw2 += fstride*2;

         Fout[m].r = SUB32_ovflw(Fout->r, HALF_OF(scratch[3].r));
         Fout[m].i = SUB32_ovflw(Fout->i, HALF_OF(scratch[3].i));

         C_MULBYSCALAR( scratch[0] , epi3.i );

         C_ADDTO(*Fout,scratch[3]);

         Fout[m2].r = ADD32_ovflw(Fout[m].r, scratch[0].i);
         Fout[m2].i = SUB32_ovflw(Fout[m].i, scratch[0].r);

         Fout[m].r = SUB32_ovflw(Fout[m].r, scratch[0].i);
         Fout[m].i = ADD32_ovflw(Fout[m].i, scratch[0].r);

         ++Fout;
      } while(--k);
   }
}
开发者ID:Appsgeyser，项目名称:Custom-messenger，代码行数:56，代码来源:kiss_fft.c


示例3: kf_bfly3

static void kf_bfly3(
                     kiss_fft_cpx * Fout,
                     const size_t fstride,
                     const kiss_fft_state *st,
                     int m,
                     int N,
                     int mm
                    )
{
   int i;
   size_t k;
   const size_t m2 = 2*m;
   const kiss_twiddle_cpx *tw1,*tw2;
   kiss_fft_cpx scratch[5];
   kiss_twiddle_cpx epi3;

   kiss_fft_cpx * Fout_beg = Fout;
   epi3 = st->twiddles[fstride*m];
   for (i=0;i<N;i++)
   {
      Fout = Fout_beg + i*mm;
      tw1=tw2=st->twiddles;
      k=m;
      do {
         C_FIXDIV(*Fout,3); C_FIXDIV(Fout[m],3); C_FIXDIV(Fout[m2],3);

         C_MUL(scratch[1],Fout[m] , *tw1);
         C_MUL(scratch[2],Fout[m2] , *tw2);

         C_ADD(scratch[3],scratch[1],scratch[2]);
         C_SUB(scratch[0],scratch[1],scratch[2]);
         tw1 += fstride;
         tw2 += fstride*2;

         Fout[m].r = Fout->r - HALF_OF(scratch[3].r);
         Fout[m].i = Fout->i - HALF_OF(scratch[3].i);

         C_MULBYSCALAR( scratch[0] , epi3.i );

         C_ADDTO(*Fout,scratch[3]);

         Fout[m2].r = Fout[m].r + scratch[0].i;
         Fout[m2].i = Fout[m].i - scratch[0].r;

         Fout[m].r -= scratch[0].i;
         Fout[m].i += scratch[0].r;

         ++Fout;
      } while(--k);
   }
}
开发者ID:FreshLeaf8865，项目名称:mumble，代码行数:51，代码来源:kiss_fft.c


示例4: kf_bfly4

static void kf_bfly4(
    kiss_fft_cpx * Fout,
    const size_t fstride,
    const kiss_fft_cfg st,
    const size_t m
)
{
    kiss_fft_cpx *tw1,*tw2,*tw3;
    kiss_fft_cpx scratch[6];
    size_t k=m;
    const size_t m2=2*m;
    const size_t m3=3*m;


    tw3 = tw2 = tw1 = st->twiddles;

    do {
        C_FIXDIV(*Fout,4);
        C_FIXDIV(Fout[m],4);
        C_FIXDIV(Fout[m2],4);
        C_FIXDIV(Fout[m3],4);

        C_MUL(scratch[0],Fout[m] , *tw1 );
        C_MUL(scratch[1],Fout[m2] , *tw2 );
        C_MUL(scratch[2],Fout[m3] , *tw3 );

        C_SUB( scratch[5] , *Fout, scratch[1] );
        C_ADDTO(*Fout, scratch[1]);
        C_ADD( scratch[3] , scratch[0] , scratch[2] );
        C_SUB( scratch[4] , scratch[0] , scratch[2] );
        C_SUB( Fout[m2], *Fout, scratch[3] );
        tw1 += fstride;
        tw2 += fstride*2;
        tw3 += fstride*3;
        C_ADDTO( *Fout , scratch[3] );

        if(st->inverse) {
            Fout[m].r = scratch[5].r - scratch[4].i;
            Fout[m].i = scratch[5].i + scratch[4].r;
            Fout[m3].r = scratch[5].r + scratch[4].i;
            Fout[m3].i = scratch[5].i - scratch[4].r;
        } else {
            Fout[m].r = scratch[5].r + scratch[4].i;
            Fout[m].i = scratch[5].i - scratch[4].r;
            Fout[m3].r = scratch[5].r - scratch[4].i;
            Fout[m3].i = scratch[5].i + scratch[4].r;
        }
        ++Fout;
    } while(--k);
}
开发者ID:Biohazard90，项目名称:CorsairRGBSpectrumVisualizer，代码行数:50，代码来源:kiss_fft.c


示例5: kf_bfly_generic

/* perform the butterfly for one stage of a mixed radix FFT */
static void
kf_bfly_generic (kiss_fft_s16_cpx * Fout,
    const size_t fstride, const kiss_fft_s16_cfg st, int m, int p)
{
  int u, k, q1, q;
  kiss_fft_s16_cpx *twiddles = st->twiddles;
  kiss_fft_s16_cpx t;
  int Norig = st->nfft;

  CHECKBUF (scratchbuf, nscratchbuf, p);

  for (u = 0; u < m; ++u) {
    k = u;
    for (q1 = 0; q1 < p; ++q1) {
      scratchbuf[q1] = Fout[k];
      C_FIXDIV (scratchbuf[q1], p);
      k += m;
    }

    k = u;
    for (q1 = 0; q1 < p; ++q1) {
      int twidx = 0;

      Fout[k] = scratchbuf[0];
      for (q = 1; q < p; ++q) {
        twidx += fstride * k;
        if (twidx >= Norig)
          twidx -= Norig;
        C_MUL (t, scratchbuf[q], twiddles[twidx]);
        C_ADDTO (Fout[k], t);
      }
      k += m;
    }
  }
}
开发者ID:ConfusedReality，项目名称:pkg_multimedia_gst-plugins-base，代码行数:36，代码来源:kiss_fft_s16.c


示例6: kf_bfly2

static void kf_bfly2(
                     kiss_fft_cpx * Fout,
                     const size_t fstride,
                     const kiss_fft_state *st,
                     int m,
                     int N,
                     int mm
                    )
{
   kiss_fft_cpx * Fout2;
   const kiss_twiddle_cpx * tw1;
   int i,j;
   kiss_fft_cpx * Fout_beg = Fout;
   for (i=0;i<N;i++)
   {
      Fout = Fout_beg + i*mm;
      Fout2 = Fout + m;
      tw1 = st->twiddles;
      for(j=0;j<m;j++)
      {
         kiss_fft_cpx t;
         Fout->r = SHR(Fout->r, 1);Fout->i = SHR(Fout->i, 1);
         Fout2->r = SHR(Fout2->r, 1);Fout2->i = SHR(Fout2->i, 1);
         C_MUL (t,  *Fout2 , *tw1);
         tw1 += fstride;
         C_SUB( *Fout2 ,  *Fout , t );
         C_ADDTO( *Fout ,  t );
         ++Fout2;
         ++Fout;
      }
   }
}
开发者ID:FreshLeaf8865，项目名称:mumble，代码行数:32，代码来源:kiss_fft.c


示例7: kf_bfly_generic

/* perform the butterfly for one stage of a mixed radix FFT */
static void kf_bfly_generic(kiss_fft_cpx *Fout, const size_t fstride,
                            const kiss_fft_cfg st, int m, int p) {
  int u, k, q1, q;
  kiss_fft_cpx *twiddles = st->twiddles;
  kiss_fft_cpx t;
  int Norig = st->nfft;

  kiss_fft_cpx *scratch =
      (kiss_fft_cpx *)KISS_FFT_TMP_ALLOC(sizeof(kiss_fft_cpx) * p);

  for (u = 0; u < m; ++u) {
    k = u;
    for (q1 = 0; q1 < p; ++q1) {
      scratch[q1] = Fout[k];
      C_FIXDIV(scratch[q1], p);
      k += m;
    }

    k = u;
    for (q1 = 0; q1 < p; ++q1) {
      int twidx = 0;
      Fout[k] = scratch[0];
      for (q = 1; q < p; ++q) {
        twidx += static_cast<int>(fstride) * k;
        if (twidx >= Norig)
          twidx -= Norig;
        C_MUL(t, scratch[q], twiddles[twidx]);
        C_ADDTO(Fout[k], t);
      }
      k += m;
    }
  }
  KISS_FFT_TMP_FREE(scratch);
}
开发者ID:AdmiralCurtiss，项目名称:dolphin，代码行数:35，代码来源:KissFFT.cpp


示例8: kf_bfly2

static void kf_bfly2(
        kiss_fft_cpx * Fout,
        const size_t fstride,
        const kiss_fft_cfg st,
        int m,
        int N,
        int mm
        )
{
    kiss_fft_cpx * Fout2;
    kiss_fft_cpx * tw1;
    kiss_fft_cpx t;
    if (!st->inverse) {
       int i,j;
       kiss_fft_cpx * Fout_beg = Fout;
       for (i=0;i<N;i++)
       {
          Fout = Fout_beg + i*mm;
          Fout2 = Fout + m;
          tw1 = st->twiddles;
          for(j=0;j<m;j++)
          {
             /* Almost the same as the code path below, except that we divide the input by two
              (while keeping the best accuracy possible) */
             ms_word32_t tr, ti;
             tr = SHR32(SUB32(MULT16_16(Fout2->r , tw1->r),MULT16_16(Fout2->i , tw1->i)), 1);
             ti = SHR32(ADD32(MULT16_16(Fout2->i , tw1->r),MULT16_16(Fout2->r , tw1->i)), 1);
             tw1 += fstride;
             Fout2->r = PSHR32(SUB32(SHL32(EXTEND32(Fout->r), 14), tr), 15);
             Fout2->i = PSHR32(SUB32(SHL32(EXTEND32(Fout->i), 14), ti), 15);
             Fout->r = PSHR32(ADD32(SHL32(EXTEND32(Fout->r), 14), tr), 15);
             Fout->i = PSHR32(ADD32(SHL32(EXTEND32(Fout->i), 14), ti), 15);
             ++Fout2;
             ++Fout;
          }
       }
    } else {
       int i,j;
       kiss_fft_cpx * Fout_beg = Fout;
       for (i=0;i<N;i++)
       {
          Fout = Fout_beg + i*mm;
          Fout2 = Fout + m;
          tw1 = st->twiddles;
          for(j=0;j<m;j++)
          {
             C_MUL (t,  *Fout2 , *tw1);
             tw1 += fstride;
             C_SUB( *Fout2 ,  *Fout , t );
             C_ADDTO( *Fout ,  t );
             ++Fout2;
             ++Fout;
          }
       }
    }
}
开发者ID:Amini-Philips，项目名称:mediastreamer2，代码行数:56，代码来源:kiss_fft.c


示例9: kf_bfly2

static void kf_bfly2(kiss_fft_cpx *Fout, const size_t fstride,
                     const kiss_fft_cfg st, int m) {
  kiss_fft_cpx *Fout2;
  kiss_fft_cpx *tw1 = st->twiddles;
  kiss_fft_cpx t;
  Fout2 = Fout + m;
  do {
    C_FIXDIV(*Fout, 2);
    C_FIXDIV(*Fout2, 2);

    C_MUL(t, *Fout2, *tw1);
    tw1 += fstride;
    C_SUB(*Fout2, *Fout, t);
    C_ADDTO(*Fout, t);
    ++Fout2;
    ++Fout;
  } while (--m);
}
开发者ID:AdmiralCurtiss，项目名称:dolphin，代码行数:18，代码来源:KissFFT.cpp


示例10: kf_bfly_generic

/* perform the butterfly for one stage of a mixed radix FFT */
static void kf_bfly_generic(
        kiss_fft_cpx * Fout,
        const size_t fstride,
        const kiss_fft_cfg st,
        int m,
        int p
        )
{
    int u,k,q1,q;
    kiss_fft_cpx * twiddles = st->twiddles;
    kiss_fft_cpx t;
    kiss_fft_cpx scratchbuf[17];
    int Norig = st->nfft;

    /*CHECKBUF(scratchbuf,nscratchbuf,p);*/
    if (p>17)
       ms_fatal("KissFFT: max radix supported is 17");
    
    for ( u=0; u<m; ++u ) {
        k=u;
        for ( q1=0 ; q1<p ; ++q1 ) {
            scratchbuf[q1] = Fout[ k  ];
        if (!st->inverse) {
            C_FIXDIV(scratchbuf[q1],p);
	}
            k += m;
        }

        k=u;
        for ( q1=0 ; q1<p ; ++q1 ) {
            int twidx=0;
            Fout[ k ] = scratchbuf[0];
            for (q=1;q<p;++q ) {
                twidx += fstride * k;
                if (twidx>=Norig) twidx-=Norig;
                C_MUL(t,scratchbuf[q] , twiddles[twidx] );
                C_ADDTO( Fout[ k ] ,t);
            }
            k += m;
        }
    }
}
开发者ID:Amini-Philips，项目名称:mediastreamer2，代码行数:43，代码来源:kiss_fft.c


示例11: kf_bfly_generic

/* perform the butterfly for one stage of a mixed radix FFT */
static void kf_bfly_generic(
        complex * Fout,
        const size_t fstride,
        const kiss_fft_cfg st,
        int m,
        int p
        )
{
    int u,k,q1,q;
    complex * twiddles = st->twiddles;
    complex t;
    int Norig = st->nfft;

    complex * scratch = (complex*)malloc(sizeof(complex)*p);

    for ( u=0; u<m; ++u ) {
        k=u;
        for ( q1=0 ; q1<p ; ++q1 ) {
            scratch[q1] = Fout[ k  ];
            C_FIXDIV(scratch[q1],p);
            k += m;
        }

        k=u;
        for ( q1=0 ; q1<p ; ++q1 ) {
            int twidx=0;
            Fout[ k ] = scratch[0];
            for (q=1;q<p;++q ) {
                twidx += fstride * k;
                if (twidx>=Norig) twidx-=Norig;
                C_MUL(t,scratch[q] , twiddles[twidx] );
                C_ADDTO( Fout[ k ] ,t);
            }
            k += m;
        }
    }
    free(scratch);
}
开发者ID:JanThorbecke，项目名称:OpenSource，代码行数:39，代码来源:kiss_fft.c


示例12: kf_bfly4

static void kf_bfly4(
                     kiss_fft_cpx * Fout,
                     const size_t fstride,
                     const kiss_fft_state *st,
                     int m,
                     int N,
                     int mm
                    )
{
   int i;

   if (m==1)
   {
      /* Degenerate case where all the twiddles are 1. */
      for (i=0;i<N;i++)
      {
         kiss_fft_cpx scratch0, scratch1;

         C_SUB( scratch0 , *Fout, Fout[2] );
         C_ADDTO(*Fout, Fout[2]);
         C_ADD( scratch1 , Fout[1] , Fout[3] );
         C_SUB( Fout[2], *Fout, scratch1 );
         C_ADDTO( *Fout , scratch1 );
         C_SUB( scratch1 , Fout[1] , Fout[3] );

         Fout[1].r = ADD32_ovflw(scratch0.r, scratch1.i);
         Fout[1].i = SUB32_ovflw(scratch0.i, scratch1.r);
         Fout[3].r = SUB32_ovflw(scratch0.r, scratch1.i);
         Fout[3].i = ADD32_ovflw(scratch0.i, scratch1.r);
         Fout+=4;
      }
   } else {
      int j;
      kiss_fft_cpx scratch[6];
      const kiss_twiddle_cpx *tw1,*tw2,*tw3;
      const int m2=2*m;
      const int m3=3*m;
      kiss_fft_cpx * Fout_beg = Fout;
      for (i=0;i<N;i++)
      {
         Fout = Fout_beg + i*mm;
         tw3 = tw2 = tw1 = st->twiddles;
         /* m is guaranteed to be a multiple of 4. */
         for (j=0;j<m;j++)
         {
            C_MUL(scratch[0],Fout[m] , *tw1 );
            C_MUL(scratch[1],Fout[m2] , *tw2 );
            C_MUL(scratch[2],Fout[m3] , *tw3 );

            C_SUB( scratch[5] , *Fout, scratch[1] );
            C_ADDTO(*Fout, scratch[1]);
            C_ADD( scratch[3] , scratch[0] , scratch[2] );
            C_SUB( scratch[4] , scratch[0] , scratch[2] );
            C_SUB( Fout[m2], *Fout, scratch[3] );
            tw1 += fstride;
            tw2 += fstride*2;
            tw3 += fstride*3;
            C_ADDTO( *Fout , scratch[3] );

            Fout[m].r = ADD32_ovflw(scratch[5].r, scratch[4].i);
            Fout[m].i = SUB32_ovflw(scratch[5].i, scratch[4].r);
            Fout[m3].r = SUB32_ovflw(scratch[5].r, scratch[4].i);
            Fout[m3].i = ADD32_ovflw(scratch[5].i, scratch[4].r);
            ++Fout;
         }
      }
   }
}
开发者ID:Appsgeyser，项目名称:Custom-messenger，代码行数:68，代码来源:kiss_fft.c


示例13: kf_bfly4

static void kf_bfly4(
        kiss_fft_cpx * Fout,
        const size_t fstride,
        const kiss_fft_cfg st,
        int m,
        int N,
        int mm
        )
{
    kiss_fft_cpx *tw1,*tw2,*tw3;
    kiss_fft_cpx scratch[6];
    const size_t m2=2*m;
    const size_t m3=3*m;
    int i, j;

    if (st->inverse)
    {
       kiss_fft_cpx * Fout_beg = Fout;
       for (i=0;i<N;i++)
       {
          Fout = Fout_beg + i*mm;
          tw3 = tw2 = tw1 = st->twiddles;
          for (j=0;j<m;j++)
          {
             C_MUL(scratch[0],Fout[m] , *tw1 );
             C_MUL(scratch[1],Fout[m2] , *tw2 );
             C_MUL(scratch[2],Fout[m3] , *tw3 );
             
             C_SUB( scratch[5] , *Fout, scratch[1] );
             C_ADDTO(*Fout, scratch[1]);
             C_ADD( scratch[3] , scratch[0] , scratch[2] );
             C_SUB( scratch[4] , scratch[0] , scratch[2] );
             C_SUB( Fout[m2], *Fout, scratch[3] );
             tw1 += fstride;
             tw2 += fstride*2;
             tw3 += fstride*3;
             C_ADDTO( *Fout , scratch[3] );
             
             Fout[m].r = scratch[5].r - scratch[4].i;
             Fout[m].i = scratch[5].i + scratch[4].r;
             Fout[m3].r = scratch[5].r + scratch[4].i;
             Fout[m3].i = scratch[5].i - scratch[4].r;
             ++Fout;
          }
       }
    } else
    {
       kiss_fft_cpx * Fout_beg = Fout;
       for (i=0;i<N;i++)
       {
          Fout = Fout_beg + i*mm;
          tw3 = tw2 = tw1 = st->twiddles;
          for (j=0;j<m;j++)
          {
             C_MUL4(scratch[0],Fout[m] , *tw1 );
             C_MUL4(scratch[1],Fout[m2] , *tw2 );
             C_MUL4(scratch[2],Fout[m3] , *tw3 );
             
             Fout->r = PSHR16(Fout->r, 2);
             Fout->i = PSHR16(Fout->i, 2);
             C_SUB( scratch[5] , *Fout, scratch[1] );
             C_ADDTO(*Fout, scratch[1]);
             C_ADD( scratch[3] , scratch[0] , scratch[2] );
             C_SUB( scratch[4] , scratch[0] , scratch[2] );
             Fout[m2].r = PSHR16(Fout[m2].r, 2);
             Fout[m2].i = PSHR16(Fout[m2].i, 2);
             C_SUB( Fout[m2], *Fout, scratch[3] );
             tw1 += fstride;
             tw2 += fstride*2;
             tw3 += fstride*3;
             C_ADDTO( *Fout , scratch[3] );
             
             Fout[m].r = scratch[5].r + scratch[4].i;
             Fout[m].i = scratch[5].i - scratch[4].r;
             Fout[m3].r = scratch[5].r - scratch[4].i;
             Fout[m3].i = scratch[5].i + scratch[4].r;
             ++Fout;
          }
       }
    }
}
开发者ID:Amini-Philips，项目名称:mediastreamer2，代码行数:81，代码来源:kiss_fft.c


示例14: kf_bfly5

static void kf_bfly5(
                     kiss_fft_cpx * Fout,
                     const size_t fstride,
                     const kiss_fft_state *st,
                     int m,
                     int N,
                     int mm
                    )
{
   kiss_fft_cpx *Fout0,*Fout1,*Fout2,*Fout3,*Fout4;
   int i, u;
   kiss_fft_cpx scratch[13];
   const kiss_twiddle_cpx *tw;
   kiss_twiddle_cpx ya,yb;
   kiss_fft_cpx * Fout_beg = Fout;

#ifdef FIXED_POINT
   ya.r = 10126;
   ya.i = -31164;
   yb.r = -26510;
   yb.i = -19261;
#else
   ya = st->twiddles[fstride*m];
   yb = st->twiddles[fstride*2*m];
#endif
   tw=st->twiddles;

   for (i=0;i<N;i++)
   {
      Fout = Fout_beg + i*mm;
      Fout0=Fout;
      Fout1=Fout0+m;
      Fout2=Fout0+2*m;
      Fout3=Fout0+3*m;
      Fout4=Fout0+4*m;

      /* For non-custom modes, m is guaranteed to be a multiple of 4. */
      for ( u=0; u<m; ++u ) {
         scratch[0] = *Fout0;

         C_MUL(scratch[1] ,*Fout1, tw[u*fstride]);
         C_MUL(scratch[2] ,*Fout2, tw[2*u*fstride]);
         C_MUL(scratch[3] ,*Fout3, tw[3*u*fstride]);
         C_MUL(scratch[4] ,*Fout4, tw[4*u*fstride]);

         C_ADD( scratch[7],scratch[1],scratch[4]);
         C_SUB( scratch[10],scratch[1],scratch[4]);
         C_ADD( scratch[8],scratch[2],scratch[3]);
         C_SUB( scratch[9],scratch[2],scratch[3]);

         Fout0->r = ADD32_ovflw(Fout0->r, ADD32_ovflw(scratch[7].r, scratch[8].r));
         Fout0->i = ADD32_ovflw(Fout0->i, ADD32_ovflw(scratch[7].i, scratch[8].i));

         scratch[5].r = ADD32_ovflw(scratch[0].r, ADD32_ovflw(S_MUL(scratch[7].r,ya.r), S_MUL(scratch[8].r,yb.r)));
         scratch[5].i = ADD32_ovflw(scratch[0].i, ADD32_ovflw(S_MUL(scratch[7].i,ya.r), S_MUL(scratch[8].i,yb.r)));

         scratch[6].r =  ADD32_ovflw(S_MUL(scratch[10].i,ya.i), S_MUL(scratch[9].i,yb.i));
         scratch[6].i = NEG32_ovflw(ADD32_ovflw(S_MUL(scratch[10].r,ya.i), S_MUL(scratch[9].r,yb.i)));

         C_SUB(*Fout1,scratch[5],scratch[6]);
         C_ADD(*Fout4,scratch[5],scratch[6]);

         scratch[11].r = ADD32_ovflw(scratch[0].r, ADD32_ovflw(S_MUL(scratch[7].r,yb.r), S_MUL(scratch[8].r,ya.r)));
         scratch[11].i = ADD32_ovflw(scratch[0].i, ADD32_ovflw(S_MUL(scratch[7].i,yb.r), S_MUL(scratch[8].i,ya.r)));
         scratch[12].r = SUB32_ovflw(S_MUL(scratch[9].i,ya.i), S_MUL(scratch[10].i,yb.i));
         scratch[12].i = SUB32_ovflw(S_MUL(scratch[10].r,yb.i), S_MUL(scratch[9].r,ya.i));

         C_ADD(*Fout2,scratch[11],scratch[12]);
         C_SUB(*Fout3,scratch[11],scratch[12]);

         ++Fout0;++Fout1;++Fout2;++Fout3;++Fout4;
      }
   }
}
开发者ID:Appsgeyser，项目名称:Custom-messenger，代码行数:74，代码来源:kiss_fft.c



注：本文中的C_MUL函数示例整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。

鲜花
握手
雷人
路过
鸡蛋
该文章已有0人参与评论

请发表评论

全部评论

专题导读
More+
上一篇：
C++ C_PARAMS函数代码示例发布时间：2022-05-30
下一篇：
C++ C_FLAGS函数代码示例发布时间：2022-05-30
热门推荐
More+
热门话题
More+
阅读排行榜

扫描微信二维码

查看手机版网站

随时了解更新最新资讯

139-2527-9053

在线客服（服务时间 9:00～18:00）

在线QQ客服
地址：深圳市南山区西丽大学城创智工业园
电邮：jeky_zhao#qq.com
移动电话：139-2527-9053

Powered by 互联科技 X3.4© 2001-2213 极客世界.|Sitemap