webrtc/modules/video_processing/content_analysis_sse2.cc - platform/external/webrtc - Git at Google

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */

 #include "webrtc/modules/video_processing/content_analysis.h"

 #include <emmintrin.h>
 #include <math.h>

 namespace webrtc {

 int32_t VPMContentAnalysis::TemporalDiffMetric_SSE2() {
   uint32_t num_pixels = 0;       // counter for # of pixels
   const uint8_t* imgBufO = orig_frame_ + border_*width_ + border_;
   const uint8_t* imgBufP = prev_frame_ + border_*width_ + border_;

   const int32_t width_end = ((width_ - 2*border_) & -16) + border_;

   __m128i sad_64   = _mm_setzero_si128();
   __m128i sum_64   = _mm_setzero_si128();
   __m128i sqsum_64 = _mm_setzero_si128();
   const __m128i z  = _mm_setzero_si128();

   for (uint16_t i = 0; i < (height_ - 2*border_); i += skip_num_) {
     __m128i sqsum_32  = _mm_setzero_si128();

     const uint8_t *lineO = imgBufO;
     const uint8_t *lineP = imgBufP;

     // Work on 16 pixels at a time.  For HD content with a width of 1920
     // this loop will run ~67 times (depending on border).  Maximum for
     // abs(o-p) and sum(o) will be 255. _mm_sad_epu8 produces 2 64 bit
     // results which are then accumulated.  There is no chance of
     // rollover for these two accumulators.
     // o*o will have a maximum of 255*255 = 65025.  This will roll over
     // a 16 bit accumulator as 67*65025 > 65535, but will fit in a
     // 32 bit accumulator.
     for (uint16_t j = 0; j < width_end - border_; j += 16) {
       const __m128i o = _mm_loadu_si128((__m128i*)(lineO));
       const __m128i p = _mm_loadu_si128((__m128i*)(lineP));

       lineO += 16;
       lineP += 16;

       // Abs pixel difference between frames.
       sad_64 = _mm_add_epi64 (sad_64, _mm_sad_epu8(o, p));

       // sum of all pixels in frame
       sum_64 = _mm_add_epi64 (sum_64, _mm_sad_epu8(o, z));

       // Squared sum of all pixels in frame.
       const __m128i olo = _mm_unpacklo_epi8(o,z);
       const __m128i ohi = _mm_unpackhi_epi8(o,z);

       const __m128i sqsum_32_lo = _mm_madd_epi16(olo, olo);
       const __m128i sqsum_32_hi = _mm_madd_epi16(ohi, ohi);

       sqsum_32 = _mm_add_epi32(sqsum_32, sqsum_32_lo);
       sqsum_32 = _mm_add_epi32(sqsum_32, sqsum_32_hi);
     }

     // Add to 64 bit running sum as to not roll over.
     sqsum_64 = _mm_add_epi64(sqsum_64,
         _mm_add_epi64(_mm_unpackhi_epi32(sqsum_32,z),
         _mm_unpacklo_epi32(sqsum_32,z)));

     imgBufO += width_ * skip_num_;
     imgBufP += width_ * skip_num_;
     num_pixels += (width_end - border_);
   }

   __m128i sad_final_128;
   __m128i sum_final_128;
   __m128i sqsum_final_128;

   // Bring sums out of vector registers and into integer register
   // domain, summing them along the way.
   _mm_store_si128 (&sad_final_128, sad_64);
   _mm_store_si128 (&sum_final_128, sum_64);
   _mm_store_si128 (&sqsum_final_128, sqsum_64);

   uint64_t *sad_final_64 = reinterpret_cast<uint64_t*>(&sad_final_128);
   uint64_t *sum_final_64 = reinterpret_cast<uint64_t*>(&sum_final_128);
   uint64_t *sqsum_final_64 = reinterpret_cast<uint64_t*>(&sqsum_final_128);

   const uint32_t pixelSum = sum_final_64[0] + sum_final_64[1];
   const uint64_t pixelSqSum = sqsum_final_64[0] + sqsum_final_64[1];
   const uint32_t tempDiffSum = sad_final_64[0] + sad_final_64[1];

   // Default.
   motion_magnitude_ = 0.0f;

   if (tempDiffSum == 0) return VPM_OK;

   // Normalize over all pixels.
   const float tempDiffAvg = (float)tempDiffSum / (float)(num_pixels);
   const float pixelSumAvg = (float)pixelSum / (float)(num_pixels);
   const float pixelSqSumAvg = (float)pixelSqSum / (float)(num_pixels);
   float contrast = pixelSqSumAvg - (pixelSumAvg * pixelSumAvg);

   if (contrast > 0.0) {
     contrast = sqrt(contrast);
     motion_magnitude_ = tempDiffAvg/contrast;
   }

   return VPM_OK;
 }

 int32_t VPMContentAnalysis::ComputeSpatialMetrics_SSE2() {
   const uint8_t* imgBuf = orig_frame_ + border_*width_;
   const int32_t width_end = ((width_ - 2 * border_) & -16) + border_;

   __m128i se_32  = _mm_setzero_si128();
   __m128i sev_32 = _mm_setzero_si128();
   __m128i seh_32 = _mm_setzero_si128();
   __m128i msa_32 = _mm_setzero_si128();
   const __m128i z = _mm_setzero_si128();

   // Error is accumulated as a 32 bit value.  Looking at HD content with a
   // height of 1080 lines, or about 67 macro blocks.  If the 16 bit row
   // value is maxed out at 65529 for every row, 65529*1080 = 70777800, which
   // will not roll over a 32 bit accumulator.
   // skip_num_ is also used to reduce the number of rows
   for (int32_t i = 0; i < (height_ - 2*border_); i += skip_num_) {
     __m128i se_16  = _mm_setzero_si128();
     __m128i sev_16 = _mm_setzero_si128();
     __m128i seh_16 = _mm_setzero_si128();
     __m128i msa_16 = _mm_setzero_si128();

     // Row error is accumulated as a 16 bit value.  There are 8
     // accumulators.  Max value of a 16 bit number is 65529.  Looking
     // at HD content, 1080p, has a width of 1920, 120 macro blocks.
     // A mb at a time is processed at a time.  Absolute max error at
     // a point would be abs(0-255+255+255+255) which equals 1020.
     // 120*1020 = 122400.  The probability of hitting this is quite low
     // on well behaved content.  A specially crafted image could roll over.
     // border_ could also be adjusted to concentrate on just the center of
     // the images for an HD capture in order to reduce the possiblity of
     // rollover.
     const uint8_t *lineTop = imgBuf - width_ + border_;
     const uint8_t *lineCen = imgBuf + border_;
     const uint8_t *lineBot = imgBuf + width_ + border_;

     for (int32_t j = 0; j < width_end - border_; j += 16) {
       const __m128i t = _mm_loadu_si128((__m128i*)(lineTop));
       const __m128i l = _mm_loadu_si128((__m128i*)(lineCen - 1));
       const __m128i c = _mm_loadu_si128((__m128i*)(lineCen));
       const __m128i r = _mm_loadu_si128((__m128i*)(lineCen + 1));
       const __m128i b = _mm_loadu_si128((__m128i*)(lineBot));

       lineTop += 16;
       lineCen += 16;
       lineBot += 16;

       // center pixel unpacked
       __m128i clo = _mm_unpacklo_epi8(c,z);
       __m128i chi = _mm_unpackhi_epi8(c,z);

       // left right pixels unpacked and added together
       const __m128i lrlo = _mm_add_epi16(_mm_unpacklo_epi8(l,z),
                                         _mm_unpacklo_epi8(r,z));
       const __m128i lrhi = _mm_add_epi16(_mm_unpackhi_epi8(l,z),
                                          _mm_unpackhi_epi8(r,z));

       // top & bottom pixels unpacked and added together
       const __m128i tblo = _mm_add_epi16(_mm_unpacklo_epi8(t,z),
                                          _mm_unpacklo_epi8(b,z));
       const __m128i tbhi = _mm_add_epi16(_mm_unpackhi_epi8(t,z),
                                          _mm_unpackhi_epi8(b,z));

       // running sum of all pixels
       msa_16 = _mm_add_epi16(msa_16, _mm_add_epi16(chi, clo));

       clo = _mm_slli_epi16(clo, 1);
       chi = _mm_slli_epi16(chi, 1);
       const __m128i sevtlo = _mm_subs_epi16(clo, tblo);
       const __m128i sevthi = _mm_subs_epi16(chi, tbhi);
       const __m128i sehtlo = _mm_subs_epi16(clo, lrlo);
       const __m128i sehthi = _mm_subs_epi16(chi, lrhi);

       clo = _mm_slli_epi16(clo, 1);
       chi = _mm_slli_epi16(chi, 1);
       const __m128i setlo = _mm_subs_epi16(clo, _mm_add_epi16(lrlo, tblo));
       const __m128i sethi = _mm_subs_epi16(chi, _mm_add_epi16(lrhi, tbhi));

       // Add to 16 bit running sum
       se_16  = _mm_add_epi16(se_16, _mm_max_epi16(setlo,
           _mm_subs_epi16(z, setlo)));
       se_16  = _mm_add_epi16(se_16, _mm_max_epi16(sethi,
           _mm_subs_epi16(z, sethi)));
       sev_16 = _mm_add_epi16(sev_16, _mm_max_epi16(sevtlo,
                                              _mm_subs_epi16(z, sevtlo)));
       sev_16 = _mm_add_epi16(sev_16, _mm_max_epi16(sevthi,
           _mm_subs_epi16(z, sevthi)));
       seh_16 = _mm_add_epi16(seh_16, _mm_max_epi16(sehtlo,
             _mm_subs_epi16(z, sehtlo)));
       seh_16 = _mm_add_epi16(seh_16, _mm_max_epi16(sehthi,
             _mm_subs_epi16(z, sehthi)));
     }

     // Add to 32 bit running sum as to not roll over.
     se_32  = _mm_add_epi32(se_32, _mm_add_epi32(_mm_unpackhi_epi16(se_16,z),
         _mm_unpacklo_epi16(se_16,z)));
     sev_32 = _mm_add_epi32(sev_32, _mm_add_epi32(_mm_unpackhi_epi16(sev_16,z),
         _mm_unpacklo_epi16(sev_16,z)));
     seh_32 = _mm_add_epi32(seh_32, _mm_add_epi32(_mm_unpackhi_epi16(seh_16,z),
         _mm_unpacklo_epi16(seh_16,z)));
     msa_32 = _mm_add_epi32(msa_32, _mm_add_epi32(_mm_unpackhi_epi16(msa_16,z),
         _mm_unpacklo_epi16(msa_16,z)));

     imgBuf += width_ * skip_num_;
   }

   __m128i se_128;
   __m128i sev_128;
   __m128i seh_128;
   __m128i msa_128;

   // Bring sums out of vector registers and into integer register
   // domain, summing them along the way.
   _mm_store_si128 (&se_128, _mm_add_epi64(_mm_unpackhi_epi32(se_32,z),
         _mm_unpacklo_epi32(se_32,z)));
   _mm_store_si128 (&sev_128, _mm_add_epi64(_mm_unpackhi_epi32(sev_32,z),
       _mm_unpacklo_epi32(sev_32,z)));
   _mm_store_si128 (&seh_128, _mm_add_epi64(_mm_unpackhi_epi32(seh_32,z),
       _mm_unpacklo_epi32(seh_32,z)));
   _mm_store_si128 (&msa_128, _mm_add_epi64(_mm_unpackhi_epi32(msa_32,z),
       _mm_unpacklo_epi32(msa_32,z)));

   uint64_t *se_64 = reinterpret_cast<uint64_t*>(&se_128);
   uint64_t *sev_64 = reinterpret_cast<uint64_t*>(&sev_128);
   uint64_t *seh_64 = reinterpret_cast<uint64_t*>(&seh_128);
   uint64_t *msa_64 = reinterpret_cast<uint64_t*>(&msa_128);

   const uint32_t spatialErrSum  = se_64[0] + se_64[1];
   const uint32_t spatialErrVSum = sev_64[0] + sev_64[1];
   const uint32_t spatialErrHSum = seh_64[0] + seh_64[1];
   const uint32_t pixelMSA = msa_64[0] + msa_64[1];

   // Normalize over all pixels.
   const float spatialErr  = (float)(spatialErrSum >> 2);
   const float spatialErrH = (float)(spatialErrHSum >> 1);
   const float spatialErrV = (float)(spatialErrVSum >> 1);
   const float norm = (float)pixelMSA;

   // 2X2:
   spatial_pred_err_ = spatialErr / norm;

   // 1X2:
   spatial_pred_err_h_ = spatialErrH / norm;

   // 2X1:
   spatial_pred_err_v_ = spatialErrV / norm;

     return VPM_OK;
 }

 }  // namespace webrtc
	/*
	* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
	*
	* Use of this source code is governed by a BSD-style license
	* that can be found in the LICENSE file in the root of the source
	* tree. An additional intellectual property rights grant can be found
	* in the file PATENTS. All contributing project authors may
	* be found in the AUTHORS file in the root of the source tree.
	*/

	#include "webrtc/modules/video_processing/content_analysis.h"

	#include <emmintrin.h>
	#include <math.h>

	namespace webrtc {

	int32_t VPMContentAnalysis::TemporalDiffMetric_SSE2() {
	uint32_t num_pixels = 0; // counter for # of pixels
	const uint8_t* imgBufO = orig_frame_ + border_*width_ + border_;
	const uint8_t* imgBufP = prev_frame_ + border_*width_ + border_;

	const int32_t width_end = ((width_ - 2*border_) & -16) + border_;

	__m128i sad_64 = _mm_setzero_si128();
	__m128i sum_64 = _mm_setzero_si128();
	__m128i sqsum_64 = _mm_setzero_si128();
	const __m128i z = _mm_setzero_si128();

	for (uint16_t i = 0; i < (height_ - 2*border_); i += skip_num_) {
	__m128i sqsum_32 = _mm_setzero_si128();

	const uint8_t *lineO = imgBufO;
	const uint8_t *lineP = imgBufP;

	// Work on 16 pixels at a time. For HD content with a width of 1920
	// this loop will run ~67 times (depending on border). Maximum for
	// abs(o-p) and sum(o) will be 255. _mm_sad_epu8 produces 2 64 bit
	// results which are then accumulated. There is no chance of
	// rollover for these two accumulators.
	// oo will have a maximum of 255255 = 65025. This will roll over
	// a 16 bit accumulator as 67*65025 > 65535, but will fit in a
	// 32 bit accumulator.
	for (uint16_t j = 0; j < width_end - border_; j += 16) {
	const __m128i o = _mm_loadu_si128((__m128i*)(lineO));
	const __m128i p = _mm_loadu_si128((__m128i*)(lineP));

	lineO += 16;
	lineP += 16;

	// Abs pixel difference between frames.
	sad_64 = _mm_add_epi64 (sad_64, _mm_sad_epu8(o, p));

	// sum of all pixels in frame
	sum_64 = _mm_add_epi64 (sum_64, _mm_sad_epu8(o, z));

	// Squared sum of all pixels in frame.
	const __m128i olo = _mm_unpacklo_epi8(o,z);
	const __m128i ohi = _mm_unpackhi_epi8(o,z);

	const __m128i sqsum_32_lo = _mm_madd_epi16(olo, olo);
	const __m128i sqsum_32_hi = _mm_madd_epi16(ohi, ohi);

	sqsum_32 = _mm_add_epi32(sqsum_32, sqsum_32_lo);
	sqsum_32 = _mm_add_epi32(sqsum_32, sqsum_32_hi);
	}

	// Add to 64 bit running sum as to not roll over.
	sqsum_64 = _mm_add_epi64(sqsum_64,
	_mm_add_epi64(_mm_unpackhi_epi32(sqsum_32,z),
	_mm_unpacklo_epi32(sqsum_32,z)));

	imgBufO += width_ * skip_num_;
	imgBufP += width_ * skip_num_;
	num_pixels += (width_end - border_);
	}

	__m128i sad_final_128;
	__m128i sum_final_128;
	__m128i sqsum_final_128;

	// Bring sums out of vector registers and into integer register
	// domain, summing them along the way.
	_mm_store_si128 (&sad_final_128, sad_64);
	_mm_store_si128 (&sum_final_128, sum_64);
	_mm_store_si128 (&sqsum_final_128, sqsum_64);

	uint64_t sad_final_64 = reinterpret_cast<uint64_t>(&sad_final_128);
	uint64_t sum_final_64 = reinterpret_cast<uint64_t>(&sum_final_128);
	uint64_t sqsum_final_64 = reinterpret_cast<uint64_t>(&sqsum_final_128);

	const uint32_t pixelSum = sum_final_64[0] + sum_final_64[1];
	const uint64_t pixelSqSum = sqsum_final_64[0] + sqsum_final_64[1];
	const uint32_t tempDiffSum = sad_final_64[0] + sad_final_64[1];

	// Default.
	motion_magnitude_ = 0.0f;

	if (tempDiffSum == 0) return VPM_OK;

	// Normalize over all pixels.
	const float tempDiffAvg = (float)tempDiffSum / (float)(num_pixels);
	const float pixelSumAvg = (float)pixelSum / (float)(num_pixels);
	const float pixelSqSumAvg = (float)pixelSqSum / (float)(num_pixels);
	float contrast = pixelSqSumAvg - (pixelSumAvg * pixelSumAvg);

	if (contrast > 0.0) {
	contrast = sqrt(contrast);
	motion_magnitude_ = tempDiffAvg/contrast;
	}

	return VPM_OK;
	}

	int32_t VPMContentAnalysis::ComputeSpatialMetrics_SSE2() {
	const uint8_t* imgBuf = orig_frame_ + border_*width_;
	const int32_t width_end = ((width_ - 2 * border_) & -16) + border_;

	__m128i se_32 = _mm_setzero_si128();
	__m128i sev_32 = _mm_setzero_si128();
	__m128i seh_32 = _mm_setzero_si128();
	__m128i msa_32 = _mm_setzero_si128();
	const __m128i z = _mm_setzero_si128();

	// Error is accumulated as a 32 bit value. Looking at HD content with a
	// height of 1080 lines, or about 67 macro blocks. If the 16 bit row
	// value is maxed out at 65529 for every row, 65529*1080 = 70777800, which
	// will not roll over a 32 bit accumulator.
	// skip_num_ is also used to reduce the number of rows
	for (int32_t i = 0; i < (height_ - 2*border_); i += skip_num_) {
	__m128i se_16 = _mm_setzero_si128();
	__m128i sev_16 = _mm_setzero_si128();
	__m128i seh_16 = _mm_setzero_si128();
	__m128i msa_16 = _mm_setzero_si128();

	// Row error is accumulated as a 16 bit value. There are 8
	// accumulators. Max value of a 16 bit number is 65529. Looking
	// at HD content, 1080p, has a width of 1920, 120 macro blocks.
	// A mb at a time is processed at a time. Absolute max error at
	// a point would be abs(0-255+255+255+255) which equals 1020.
	// 120*1020 = 122400. The probability of hitting this is quite low
	// on well behaved content. A specially crafted image could roll over.
	// border_ could also be adjusted to concentrate on just the center of
	// the images for an HD capture in order to reduce the possiblity of
	// rollover.
	const uint8_t *lineTop = imgBuf - width_ + border_;
	const uint8_t *lineCen = imgBuf + border_;
	const uint8_t *lineBot = imgBuf + width_ + border_;

	for (int32_t j = 0; j < width_end - border_; j += 16) {
	const __m128i t = _mm_loadu_si128((__m128i*)(lineTop));
	const __m128i l = _mm_loadu_si128((__m128i*)(lineCen - 1));
	const __m128i c = _mm_loadu_si128((__m128i*)(lineCen));
	const __m128i r = _mm_loadu_si128((__m128i*)(lineCen + 1));
	const __m128i b = _mm_loadu_si128((__m128i*)(lineBot));

	lineTop += 16;
	lineCen += 16;
	lineBot += 16;

	// center pixel unpacked
	__m128i clo = _mm_unpacklo_epi8(c,z);
	__m128i chi = _mm_unpackhi_epi8(c,z);

	// left right pixels unpacked and added together
	const __m128i lrlo = _mm_add_epi16(_mm_unpacklo_epi8(l,z),
	_mm_unpacklo_epi8(r,z));
	const __m128i lrhi = _mm_add_epi16(_mm_unpackhi_epi8(l,z),
	_mm_unpackhi_epi8(r,z));

	// top & bottom pixels unpacked and added together
	const __m128i tblo = _mm_add_epi16(_mm_unpacklo_epi8(t,z),
	_mm_unpacklo_epi8(b,z));
	const __m128i tbhi = _mm_add_epi16(_mm_unpackhi_epi8(t,z),
	_mm_unpackhi_epi8(b,z));

	// running sum of all pixels
	msa_16 = _mm_add_epi16(msa_16, _mm_add_epi16(chi, clo));

	clo = _mm_slli_epi16(clo, 1);
	chi = _mm_slli_epi16(chi, 1);
	const __m128i sevtlo = _mm_subs_epi16(clo, tblo);
	const __m128i sevthi = _mm_subs_epi16(chi, tbhi);
	const __m128i sehtlo = _mm_subs_epi16(clo, lrlo);
	const __m128i sehthi = _mm_subs_epi16(chi, lrhi);

	clo = _mm_slli_epi16(clo, 1);
	chi = _mm_slli_epi16(chi, 1);
	const __m128i setlo = _mm_subs_epi16(clo, _mm_add_epi16(lrlo, tblo));
	const __m128i sethi = _mm_subs_epi16(chi, _mm_add_epi16(lrhi, tbhi));

	// Add to 16 bit running sum
	se_16 = _mm_add_epi16(se_16, _mm_max_epi16(setlo,
	_mm_subs_epi16(z, setlo)));
	se_16 = _mm_add_epi16(se_16, _mm_max_epi16(sethi,
	_mm_subs_epi16(z, sethi)));
	sev_16 = _mm_add_epi16(sev_16, _mm_max_epi16(sevtlo,
	_mm_subs_epi16(z, sevtlo)));
	sev_16 = _mm_add_epi16(sev_16, _mm_max_epi16(sevthi,
	_mm_subs_epi16(z, sevthi)));
	seh_16 = _mm_add_epi16(seh_16, _mm_max_epi16(sehtlo,
	_mm_subs_epi16(z, sehtlo)));
	seh_16 = _mm_add_epi16(seh_16, _mm_max_epi16(sehthi,
	_mm_subs_epi16(z, sehthi)));
	}

	// Add to 32 bit running sum as to not roll over.
	se_32 = _mm_add_epi32(se_32, _mm_add_epi32(_mm_unpackhi_epi16(se_16,z),
	_mm_unpacklo_epi16(se_16,z)));
	sev_32 = _mm_add_epi32(sev_32, _mm_add_epi32(_mm_unpackhi_epi16(sev_16,z),
	_mm_unpacklo_epi16(sev_16,z)));
	seh_32 = _mm_add_epi32(seh_32, _mm_add_epi32(_mm_unpackhi_epi16(seh_16,z),
	_mm_unpacklo_epi16(seh_16,z)));
	msa_32 = _mm_add_epi32(msa_32, _mm_add_epi32(_mm_unpackhi_epi16(msa_16,z),
	_mm_unpacklo_epi16(msa_16,z)));

	imgBuf += width_ * skip_num_;
	}

	__m128i se_128;
	__m128i sev_128;
	__m128i seh_128;
	__m128i msa_128;

	// Bring sums out of vector registers and into integer register
	// domain, summing them along the way.
	_mm_store_si128 (&se_128, _mm_add_epi64(_mm_unpackhi_epi32(se_32,z),
	_mm_unpacklo_epi32(se_32,z)));
	_mm_store_si128 (&sev_128, _mm_add_epi64(_mm_unpackhi_epi32(sev_32,z),
	_mm_unpacklo_epi32(sev_32,z)));
	_mm_store_si128 (&seh_128, _mm_add_epi64(_mm_unpackhi_epi32(seh_32,z),
	_mm_unpacklo_epi32(seh_32,z)));
	_mm_store_si128 (&msa_128, _mm_add_epi64(_mm_unpackhi_epi32(msa_32,z),
	_mm_unpacklo_epi32(msa_32,z)));

	uint64_t se_64 = reinterpret_cast<uint64_t>(&se_128);
	uint64_t sev_64 = reinterpret_cast<uint64_t>(&sev_128);
	uint64_t seh_64 = reinterpret_cast<uint64_t>(&seh_128);
	uint64_t msa_64 = reinterpret_cast<uint64_t>(&msa_128);

	const uint32_t spatialErrSum = se_64[0] + se_64[1];
	const uint32_t spatialErrVSum = sev_64[0] + sev_64[1];
	const uint32_t spatialErrHSum = seh_64[0] + seh_64[1];
	const uint32_t pixelMSA = msa_64[0] + msa_64[1];

	// Normalize over all pixels.
	const float spatialErr = (float)(spatialErrSum >> 2);
	const float spatialErrH = (float)(spatialErrHSum >> 1);
	const float spatialErrV = (float)(spatialErrVSum >> 1);
	const float norm = (float)pixelMSA;

	// 2X2:
	spatial_pred_err_ = spatialErr / norm;

	// 1X2:
	spatial_pred_err_h_ = spatialErrH / norm;

	// 2X1:
	spatial_pred_err_v_ = spatialErrV / norm;

	return VPM_OK;
	}

	} // namespace webrtc