1 /* 2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include "webrtc/modules/video_processing/main/source/content_analysis.h" 12 13 #include <emmintrin.h> 14 #include <math.h> 15 16 namespace webrtc { 17 18 int32_t VPMContentAnalysis::TemporalDiffMetric_SSE2() { 19 uint32_t num_pixels = 0; // counter for # of pixels 20 const uint8_t* imgBufO = orig_frame_ + border_*width_ + border_; 21 const uint8_t* imgBufP = prev_frame_ + border_*width_ + border_; 22 23 const int32_t width_end = ((width_ - 2*border_) & -16) + border_; 24 25 __m128i sad_64 = _mm_setzero_si128(); 26 __m128i sum_64 = _mm_setzero_si128(); 27 __m128i sqsum_64 = _mm_setzero_si128(); 28 const __m128i z = _mm_setzero_si128(); 29 30 for (uint16_t i = 0; i < (height_ - 2*border_); i += skip_num_) { 31 __m128i sqsum_32 = _mm_setzero_si128(); 32 33 const uint8_t *lineO = imgBufO; 34 const uint8_t *lineP = imgBufP; 35 36 // Work on 16 pixels at a time. For HD content with a width of 1920 37 // this loop will run ~67 times (depending on border). Maximum for 38 // abs(o-p) and sum(o) will be 255. _mm_sad_epu8 produces 2 64 bit 39 // results which are then accumulated. There is no chance of 40 // rollover for these two accumulators. 41 // o*o will have a maximum of 255*255 = 65025. This will roll over 42 // a 16 bit accumulator as 67*65025 > 65535, but will fit in a 43 // 32 bit accumulator. 44 for (uint16_t j = 0; j < width_end - border_; j += 16) { 45 const __m128i o = _mm_loadu_si128((__m128i*)(lineO)); 46 const __m128i p = _mm_loadu_si128((__m128i*)(lineP)); 47 48 lineO += 16; 49 lineP += 16; 50 51 // Abs pixel difference between frames. 52 sad_64 = _mm_add_epi64 (sad_64, _mm_sad_epu8(o, p)); 53 54 // sum of all pixels in frame 55 sum_64 = _mm_add_epi64 (sum_64, _mm_sad_epu8(o, z)); 56 57 // Squared sum of all pixels in frame. 58 const __m128i olo = _mm_unpacklo_epi8(o,z); 59 const __m128i ohi = _mm_unpackhi_epi8(o,z); 60 61 const __m128i sqsum_32_lo = _mm_madd_epi16(olo, olo); 62 const __m128i sqsum_32_hi = _mm_madd_epi16(ohi, ohi); 63 64 sqsum_32 = _mm_add_epi32(sqsum_32, sqsum_32_lo); 65 sqsum_32 = _mm_add_epi32(sqsum_32, sqsum_32_hi); 66 } 67 68 // Add to 64 bit running sum as to not roll over. 69 sqsum_64 = _mm_add_epi64(sqsum_64, 70 _mm_add_epi64(_mm_unpackhi_epi32(sqsum_32,z), 71 _mm_unpacklo_epi32(sqsum_32,z))); 72 73 imgBufO += width_ * skip_num_; 74 imgBufP += width_ * skip_num_; 75 num_pixels += (width_end - border_); 76 } 77 78 __m128i sad_final_128; 79 __m128i sum_final_128; 80 __m128i sqsum_final_128; 81 82 // Bring sums out of vector registers and into integer register 83 // domain, summing them along the way. 84 _mm_store_si128 (&sad_final_128, sad_64); 85 _mm_store_si128 (&sum_final_128, sum_64); 86 _mm_store_si128 (&sqsum_final_128, sqsum_64); 87 88 uint64_t *sad_final_64 = reinterpret_cast<uint64_t*>(&sad_final_128); 89 uint64_t *sum_final_64 = reinterpret_cast<uint64_t*>(&sum_final_128); 90 uint64_t *sqsum_final_64 = reinterpret_cast<uint64_t*>(&sqsum_final_128); 91 92 const uint32_t pixelSum = sum_final_64[0] + sum_final_64[1]; 93 const uint64_t pixelSqSum = sqsum_final_64[0] + sqsum_final_64[1]; 94 const uint32_t tempDiffSum = sad_final_64[0] + sad_final_64[1]; 95 96 // Default. 97 motion_magnitude_ = 0.0f; 98 99 if (tempDiffSum == 0) return VPM_OK; 100 101 // Normalize over all pixels. 102 const float tempDiffAvg = (float)tempDiffSum / (float)(num_pixels); 103 const float pixelSumAvg = (float)pixelSum / (float)(num_pixels); 104 const float pixelSqSumAvg = (float)pixelSqSum / (float)(num_pixels); 105 float contrast = pixelSqSumAvg - (pixelSumAvg * pixelSumAvg); 106 107 if (contrast > 0.0) { 108 contrast = sqrt(contrast); 109 motion_magnitude_ = tempDiffAvg/contrast; 110 } 111 112 return VPM_OK; 113 } 114 115 int32_t VPMContentAnalysis::ComputeSpatialMetrics_SSE2() { 116 const uint8_t* imgBuf = orig_frame_ + border_*width_; 117 const int32_t width_end = ((width_ - 2 * border_) & -16) + border_; 118 119 __m128i se_32 = _mm_setzero_si128(); 120 __m128i sev_32 = _mm_setzero_si128(); 121 __m128i seh_32 = _mm_setzero_si128(); 122 __m128i msa_32 = _mm_setzero_si128(); 123 const __m128i z = _mm_setzero_si128(); 124 125 // Error is accumulated as a 32 bit value. Looking at HD content with a 126 // height of 1080 lines, or about 67 macro blocks. If the 16 bit row 127 // value is maxed out at 65529 for every row, 65529*1080 = 70777800, which 128 // will not roll over a 32 bit accumulator. 129 // skip_num_ is also used to reduce the number of rows 130 for (int32_t i = 0; i < (height_ - 2*border_); i += skip_num_) { 131 __m128i se_16 = _mm_setzero_si128(); 132 __m128i sev_16 = _mm_setzero_si128(); 133 __m128i seh_16 = _mm_setzero_si128(); 134 __m128i msa_16 = _mm_setzero_si128(); 135 136 // Row error is accumulated as a 16 bit value. There are 8 137 // accumulators. Max value of a 16 bit number is 65529. Looking 138 // at HD content, 1080p, has a width of 1920, 120 macro blocks. 139 // A mb at a time is processed at a time. Absolute max error at 140 // a point would be abs(0-255+255+255+255) which equals 1020. 141 // 120*1020 = 122400. The probability of hitting this is quite low 142 // on well behaved content. A specially crafted image could roll over. 143 // border_ could also be adjusted to concentrate on just the center of 144 // the images for an HD capture in order to reduce the possiblity of 145 // rollover. 146 const uint8_t *lineTop = imgBuf - width_ + border_; 147 const uint8_t *lineCen = imgBuf + border_; 148 const uint8_t *lineBot = imgBuf + width_ + border_; 149 150 for (int32_t j = 0; j < width_end - border_; j += 16) { 151 const __m128i t = _mm_loadu_si128((__m128i*)(lineTop)); 152 const __m128i l = _mm_loadu_si128((__m128i*)(lineCen - 1)); 153 const __m128i c = _mm_loadu_si128((__m128i*)(lineCen)); 154 const __m128i r = _mm_loadu_si128((__m128i*)(lineCen + 1)); 155 const __m128i b = _mm_loadu_si128((__m128i*)(lineBot)); 156 157 lineTop += 16; 158 lineCen += 16; 159 lineBot += 16; 160 161 // center pixel unpacked 162 __m128i clo = _mm_unpacklo_epi8(c,z); 163 __m128i chi = _mm_unpackhi_epi8(c,z); 164 165 // left right pixels unpacked and added together 166 const __m128i lrlo = _mm_add_epi16(_mm_unpacklo_epi8(l,z), 167 _mm_unpacklo_epi8(r,z)); 168 const __m128i lrhi = _mm_add_epi16(_mm_unpackhi_epi8(l,z), 169 _mm_unpackhi_epi8(r,z)); 170 171 // top & bottom pixels unpacked and added together 172 const __m128i tblo = _mm_add_epi16(_mm_unpacklo_epi8(t,z), 173 _mm_unpacklo_epi8(b,z)); 174 const __m128i tbhi = _mm_add_epi16(_mm_unpackhi_epi8(t,z), 175 _mm_unpackhi_epi8(b,z)); 176 177 // running sum of all pixels 178 msa_16 = _mm_add_epi16(msa_16, _mm_add_epi16(chi, clo)); 179 180 clo = _mm_slli_epi16(clo, 1); 181 chi = _mm_slli_epi16(chi, 1); 182 const __m128i sevtlo = _mm_subs_epi16(clo, tblo); 183 const __m128i sevthi = _mm_subs_epi16(chi, tbhi); 184 const __m128i sehtlo = _mm_subs_epi16(clo, lrlo); 185 const __m128i sehthi = _mm_subs_epi16(chi, lrhi); 186 187 clo = _mm_slli_epi16(clo, 1); 188 chi = _mm_slli_epi16(chi, 1); 189 const __m128i setlo = _mm_subs_epi16(clo, _mm_add_epi16(lrlo, tblo)); 190 const __m128i sethi = _mm_subs_epi16(chi, _mm_add_epi16(lrhi, tbhi)); 191 192 // Add to 16 bit running sum 193 se_16 = _mm_add_epi16(se_16, _mm_max_epi16(setlo, 194 _mm_subs_epi16(z, setlo))); 195 se_16 = _mm_add_epi16(se_16, _mm_max_epi16(sethi, 196 _mm_subs_epi16(z, sethi))); 197 sev_16 = _mm_add_epi16(sev_16, _mm_max_epi16(sevtlo, 198 _mm_subs_epi16(z, sevtlo))); 199 sev_16 = _mm_add_epi16(sev_16, _mm_max_epi16(sevthi, 200 _mm_subs_epi16(z, sevthi))); 201 seh_16 = _mm_add_epi16(seh_16, _mm_max_epi16(sehtlo, 202 _mm_subs_epi16(z, sehtlo))); 203 seh_16 = _mm_add_epi16(seh_16, _mm_max_epi16(sehthi, 204 _mm_subs_epi16(z, sehthi))); 205 } 206 207 // Add to 32 bit running sum as to not roll over. 208 se_32 = _mm_add_epi32(se_32, _mm_add_epi32(_mm_unpackhi_epi16(se_16,z), 209 _mm_unpacklo_epi16(se_16,z))); 210 sev_32 = _mm_add_epi32(sev_32, _mm_add_epi32(_mm_unpackhi_epi16(sev_16,z), 211 _mm_unpacklo_epi16(sev_16,z))); 212 seh_32 = _mm_add_epi32(seh_32, _mm_add_epi32(_mm_unpackhi_epi16(seh_16,z), 213 _mm_unpacklo_epi16(seh_16,z))); 214 msa_32 = _mm_add_epi32(msa_32, _mm_add_epi32(_mm_unpackhi_epi16(msa_16,z), 215 _mm_unpacklo_epi16(msa_16,z))); 216 217 imgBuf += width_ * skip_num_; 218 } 219 220 __m128i se_128; 221 __m128i sev_128; 222 __m128i seh_128; 223 __m128i msa_128; 224 225 // Bring sums out of vector registers and into integer register 226 // domain, summing them along the way. 227 _mm_store_si128 (&se_128, _mm_add_epi64(_mm_unpackhi_epi32(se_32,z), 228 _mm_unpacklo_epi32(se_32,z))); 229 _mm_store_si128 (&sev_128, _mm_add_epi64(_mm_unpackhi_epi32(sev_32,z), 230 _mm_unpacklo_epi32(sev_32,z))); 231 _mm_store_si128 (&seh_128, _mm_add_epi64(_mm_unpackhi_epi32(seh_32,z), 232 _mm_unpacklo_epi32(seh_32,z))); 233 _mm_store_si128 (&msa_128, _mm_add_epi64(_mm_unpackhi_epi32(msa_32,z), 234 _mm_unpacklo_epi32(msa_32,z))); 235 236 uint64_t *se_64 = reinterpret_cast<uint64_t*>(&se_128); 237 uint64_t *sev_64 = reinterpret_cast<uint64_t*>(&sev_128); 238 uint64_t *seh_64 = reinterpret_cast<uint64_t*>(&seh_128); 239 uint64_t *msa_64 = reinterpret_cast<uint64_t*>(&msa_128); 240 241 const uint32_t spatialErrSum = se_64[0] + se_64[1]; 242 const uint32_t spatialErrVSum = sev_64[0] + sev_64[1]; 243 const uint32_t spatialErrHSum = seh_64[0] + seh_64[1]; 244 const uint32_t pixelMSA = msa_64[0] + msa_64[1]; 245 246 // Normalize over all pixels. 247 const float spatialErr = (float)(spatialErrSum >> 2); 248 const float spatialErrH = (float)(spatialErrHSum >> 1); 249 const float spatialErrV = (float)(spatialErrVSum >> 1); 250 const float norm = (float)pixelMSA; 251 252 // 2X2: 253 spatial_pred_err_ = spatialErr / norm; 254 255 // 1X2: 256 spatial_pred_err_h_ = spatialErrH / norm; 257 258 // 2X1: 259 spatial_pred_err_v_ = spatialErrV / norm; 260 261 return VPM_OK; 262 } 263 264 } // namespace webrtc 265
