The Tor Browser / file revision

 /* Copyright (c) 2007-2008 CSIRO

    Copyright (c) 2007-2009 Xiph.Org Foundation

    Written by Jean-Marc Valin */

 /**

    @file pitch.h

    @brief Pitch analysis

  */

 /*

    Redistribution and use in source and binary forms, with or without

    modification, are permitted provided that the following conditions

    are met:

    - Redistributions of source code must retain the above copyright

    notice, this list of conditions and the following disclaimer.

    - Redistributions in binary form must reproduce the above copyright

    notice, this list of conditions and the following disclaimer in the

    documentation and/or other materials provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER

    OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

 #ifndef PITCH_H

 #define PITCH_H

 #include "modes.h"

 #include "cpu_support.h"

 #if defined(__SSE__) && !defined(FIXED_POINT)

 #include "x86/pitch_sse.h"

 #endif

 #if defined(OPUS_ARM_ASM) && defined(FIXED_POINT)

 # include "arm/pitch_arm.h"

 #endif

 void pitch_downsample(celt_sig * OPUS_RESTRICT x[], opus_val16 * OPUS_RESTRICT x_lp,

       int len, int C, int arch);

 void pitch_search(const opus_val16 * OPUS_RESTRICT x_lp, opus_val16 * OPUS_RESTRICT y,

                   int len, int max_pitch, int *pitch, int arch);

 opus_val16 remove_doubling(opus_val16 *x, int maxperiod, int minperiod,

       int N, int *T0, int prev_period, opus_val16 prev_gain);

 /* OPT: This is the kernel you really want to optimize. It gets used a lot

    by the prefilter and by the PLC. */

 #ifndef OVERRIDE_XCORR_KERNEL

 static OPUS_INLINE void xcorr_kernel(const opus_val16 * x, const opus_val16 * y, opus_val32 sum[4], int len)

 {

    int j;

    opus_val16 y_0, y_1, y_2, y_3;

    celt_assert(len>=3);

    y_3=0; /* gcc doesn't realize that y_3 can't be used uninitialized */

    y_0=*y++;

    y_1=*y++;

    y_2=*y++;

    for (j=0;j<len-3;j+=4)

    {

       opus_val16 tmp;

       tmp = *x++;

       y_3=*y++;

       sum[0] = MAC16_16(sum[0],tmp,y_0);

       sum[1] = MAC16_16(sum[1],tmp,y_1);

       sum[2] = MAC16_16(sum[2],tmp,y_2);

       sum[3] = MAC16_16(sum[3],tmp,y_3);

       tmp=*x++;

       y_0=*y++;

       sum[0] = MAC16_16(sum[0],tmp,y_1);

       sum[1] = MAC16_16(sum[1],tmp,y_2);

       sum[2] = MAC16_16(sum[2],tmp,y_3);

       sum[3] = MAC16_16(sum[3],tmp,y_0);

       tmp=*x++;

       y_1=*y++;

       sum[0] = MAC16_16(sum[0],tmp,y_2);

       sum[1] = MAC16_16(sum[1],tmp,y_3);

       sum[2] = MAC16_16(sum[2],tmp,y_0);

       sum[3] = MAC16_16(sum[3],tmp,y_1);

       tmp=*x++;

       y_2=*y++;

       sum[0] = MAC16_16(sum[0],tmp,y_3);

       sum[1] = MAC16_16(sum[1],tmp,y_0);

       sum[2] = MAC16_16(sum[2],tmp,y_1);

       sum[3] = MAC16_16(sum[3],tmp,y_2);

    }

    if (j++<len)

    {

       opus_val16 tmp = *x++;

       y_3=*y++;

       sum[0] = MAC16_16(sum[0],tmp,y_0);

       sum[1] = MAC16_16(sum[1],tmp,y_1);

       sum[2] = MAC16_16(sum[2],tmp,y_2);

       sum[3] = MAC16_16(sum[3],tmp,y_3);

    }

    if (j++<len)

    {

       opus_val16 tmp=*x++;

       y_0=*y++;

       sum[0] = MAC16_16(sum[0],tmp,y_1);

       sum[1] = MAC16_16(sum[1],tmp,y_2);

       sum[2] = MAC16_16(sum[2],tmp,y_3);

       sum[3] = MAC16_16(sum[3],tmp,y_0);

    }

    if (j<len)

    {

       opus_val16 tmp=*x++;

       y_1=*y++;

       sum[0] = MAC16_16(sum[0],tmp,y_2);

       sum[1] = MAC16_16(sum[1],tmp,y_3);

       sum[2] = MAC16_16(sum[2],tmp,y_0);

       sum[3] = MAC16_16(sum[3],tmp,y_1);

    }

 }

 #endif /* OVERRIDE_XCORR_KERNEL */

 #ifndef OVERRIDE_DUAL_INNER_PROD

 static OPUS_INLINE void dual_inner_prod(const opus_val16 *x, const opus_val16 *y01, const opus_val16 *y02,

       int N, opus_val32 *xy1, opus_val32 *xy2)

 {

    int i;

    opus_val32 xy01=0;

    opus_val32 xy02=0;

    for (i=0;i<N;i++)

    {

       xy01 = MAC16_16(xy01, x[i], y01[i]);

       xy02 = MAC16_16(xy02, x[i], y02[i]);

    }

    *xy1 = xy01;

    *xy2 = xy02;

 }

 #endif

 #ifdef FIXED_POINT

 opus_val32

 #else

 void

 #endif

 celt_pitch_xcorr_c(const opus_val16 *_x, const opus_val16 *_y,

       opus_val32 *xcorr, int len, int max_pitch);

 #if !defined(OVERRIDE_PITCH_XCORR)

 /*Is run-time CPU detection enabled on this platform?*/

 # if defined(OPUS_HAVE_RTCD)

 extern

 #  if defined(FIXED_POINT)

 opus_val32

 #  else

 void

 #  endif

 (*const CELT_PITCH_XCORR_IMPL[OPUS_ARCHMASK+1])(const opus_val16 *,

       const opus_val16 *, opus_val32 *, int, int);

 #  define celt_pitch_xcorr(_x, _y, xcorr, len, max_pitch, arch) \

   ((*CELT_PITCH_XCORR_IMPL[(arch)&OPUS_ARCHMASK])(_x, _y, \

         xcorr, len, max_pitch))

 # else

 #  define celt_pitch_xcorr(_x, _y, xcorr, len, max_pitch, arch) \

   ((void)(arch),celt_pitch_xcorr_c(_x, _y, xcorr, len, max_pitch))

 # endif

 #endif

 #endif