vp8/encoder/picklpf.c

   1 /*
   2  *  Copyright (c) 2010 The WebM 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
  12 #include "vp8/common/onyxc_int.h"
  13 #include "onyx_int.h"
  14 #include "quantize.h"
  15 #include "vpx_mem/vpx_mem.h"
  16 #include "vpx_scale/yv12extend.h"
  17 #include "vpx_scale/vpxscale.h"
  18 #include "vp8/common/alloccommon.h"
  19 #include "vp8/common/loopfilter.h"
  20 #if ARCH_ARM
  21 #include "vpx_ports/arm.h"
  22 #endif
  23
  24 extern int vp8_calc_ss_err(YV12_BUFFER_CONFIG *source, YV12_BUFFER_CONFIG *dest, const vp8_variance_rtcd_vtable_t *rtcd);
  25 #if HAVE_ARMV7
  26 extern void vp8_yv12_copy_frame_yonly_no_extend_frame_borders_neon(YV12_BUFFER_CONFIG *src_ybc, YV12_BUFFER_CONFIG *dst_ybc);
  27 #endif
  28
  29 #if CONFIG_RUNTIME_CPU_DETECT
  30 #define IF_RTCD(x) (x)
  31 #else
  32 #define IF_RTCD(x) NULL
  33 #endif
  34
  35 extern void
  36 (*vp8_yv12_copy_partial_frame_ptr)(YV12_BUFFER_CONFIG *src_ybc,
  37                                    YV12_BUFFER_CONFIG *dst_ybc,
  38                                    int Fraction);
  39 void
  40 vp8_yv12_copy_partial_frame(YV12_BUFFER_CONFIG *src_ybc, YV12_BUFFER_CONFIG *dst_ybc, int Fraction)
  41 {
  42     unsigned char *src_y, *dst_y;
  43     int yheight;
  44     int ystride;
  45     int border;
  46     int yoffset;
  47     int linestocopy;
  48
  49     border   = src_ybc->border;
  50     yheight  = src_ybc->y_height;
  51     ystride  = src_ybc->y_stride;
  52
  53     linestocopy = (yheight >> (Fraction + 4));
  54
  55     if (linestocopy < 1)
  56         linestocopy = 1;
  57
  58     linestocopy <<= 4;
  59
  60     yoffset  = ystride * ((yheight >> 5) * 16 - 8);
  61     src_y = src_ybc->y_buffer + yoffset;
  62     dst_y = dst_ybc->y_buffer + yoffset;
  63
  64     vpx_memcpy(dst_y, src_y, ystride *(linestocopy + 16));
  65 }
  66
  67 static int vp8_calc_partial_ssl_err(YV12_BUFFER_CONFIG *source, YV12_BUFFER_CONFIG *dest, int Fraction, const vp8_variance_rtcd_vtable_t *rtcd)
  68 {
  69     int i, j;
  70     int Total = 0;
  71     int srcoffset, dstoffset;
  72     unsigned char *src = source->y_buffer;
  73     unsigned char *dst = dest->y_buffer;
  74
  75     int linestocopy = (source->y_height >> (Fraction + 4));
  76     (void)rtcd;
  77
  78     if (linestocopy < 1)
  79         linestocopy = 1;
  80
  81     linestocopy <<= 4;
  82
  83
  84     srcoffset = source->y_stride   * (dest->y_height >> 5) * 16;
  85     dstoffset = dest->y_stride     * (dest->y_height >> 5) * 16;
  86
  87     src += srcoffset;
  88     dst += dstoffset;
  89
  90     // Loop through the Y plane raw and reconstruction data summing (square differences)
  91     for (i = 0; i < linestocopy; i += 16)
  92     {
  93         for (j = 0; j < source->y_width; j += 16)
  94         {
  95             unsigned int sse;
  96             Total += VARIANCE_INVOKE(rtcd, mse16x16)(src + j, source->y_stride, dst + j, dest->y_stride, &sse);
  97         }
  98
  99         src += 16 * source->y_stride;
 100         dst += 16 * dest->y_stride;
 101     }
 102
 103     return Total;
 104 }
 105
 106 // Enforce a minimum filter level based upon baseline Q
 107 static int get_min_filter_level(VP8_COMP *cpi, int base_qindex)
 108 {
 109     int min_filter_level;
 110
 111     if (cpi->source_alt_ref_active && cpi->common.refresh_golden_frame && !cpi->common.refresh_alt_ref_frame)
 112         min_filter_level = 0;
 113     else
 114     {
 115         if (base_qindex <= 6)
 116             min_filter_level = 0;
 117         else if (base_qindex <= 16)
 118             min_filter_level = 1;
 119         else
 120             min_filter_level = (base_qindex / 8);
 121     }
 122
 123     return min_filter_level;
 124 }
 125
 126 // Enforce a maximum filter level based upon baseline Q
 127 static int get_max_filter_level(VP8_COMP *cpi, int base_qindex)
 128 {
 129     // PGW August 2006: Highest filter values almost always a bad idea
 130
 131     // jbb chg: 20100118 - not so any more with this overquant stuff allow high values
 132     // with lots of intra coming in.
 133     int max_filter_level = MAX_LOOP_FILTER ;//* 3 / 4;
 134     (void)base_qindex;
 135
 136     if (cpi->twopass.section_intra_rating > 8)
 137         max_filter_level = MAX_LOOP_FILTER * 3 / 4;
 138
 139     return max_filter_level;
 140 }
 141
 142 void vp8cx_pick_filter_level_fast(YV12_BUFFER_CONFIG *sd, VP8_COMP *cpi)
 143 {
 144     VP8_COMMON *cm = &cpi->common;
 145
 146     int best_err = 0;
 147     int filt_err = 0;
 148     int min_filter_level = get_min_filter_level(cpi, cm->base_qindex);
 149     int max_filter_level = get_max_filter_level(cpi, cm->base_qindex);
 150     int filt_val;
 151     int best_filt_val = cm->filter_level;
 152
 153     //  Make a copy of the unfiltered / processed recon buffer
 154     vp8_yv12_copy_partial_frame_ptr(cm->frame_to_show, &cpi->last_frame_uf, 3);
 155
 156     if (cm->frame_type == KEY_FRAME)
 157         cm->sharpness_level = 0;
 158     else
 159         cm->sharpness_level = cpi->oxcf.Sharpness;
 160
 161     if (cm->sharpness_level != cm->last_sharpness_level)
 162     {
 163         vp8_loop_filter_update_sharpness(&cm->lf_info, cm->sharpness_level);
 164         cm->last_sharpness_level = cm->sharpness_level;
 165     }
 166
 167     // Start the search at the previous frame filter level unless it is now out of range.
 168     if (cm->filter_level < min_filter_level)
 169         cm->filter_level = min_filter_level;
 170     else if (cm->filter_level > max_filter_level)
 171         cm->filter_level = max_filter_level;
 172
 173     filt_val = cm->filter_level;
 174     best_filt_val = filt_val;
 175
 176     // Get the err using the previous frame's filter value.
 177     vp8_loop_filter_partial_frame(cm, &cpi->mb.e_mbd, filt_val);
 178
 179     best_err = vp8_calc_partial_ssl_err(sd, cm->frame_to_show, 3, IF_RTCD(&cpi->rtcd.variance));
 180
 181     //  Re-instate the unfiltered frame
 182     vp8_yv12_copy_partial_frame_ptr(&cpi->last_frame_uf, cm->frame_to_show, 3);
 183
 184     filt_val -= (1 + ((filt_val > 10) ? 1 : 0));
 185
 186     // Search lower filter levels
 187     while (filt_val >= min_filter_level)
 188     {
 189         // Apply the loop filter
 190         vp8_loop_filter_partial_frame(cm, &cpi->mb.e_mbd, filt_val);
 191
 192         // Get the err for filtered frame
 193         filt_err = vp8_calc_partial_ssl_err(sd, cm->frame_to_show, 3, IF_RTCD(&cpi->rtcd.variance));
 194
 195         //  Re-instate the unfiltered frame
 196         vp8_yv12_copy_partial_frame_ptr(&cpi->last_frame_uf, cm->frame_to_show, 3);
 197
 198
 199         // Update the best case record or exit loop.
 200         if (filt_err < best_err)
 201         {
 202             best_err = filt_err;
 203             best_filt_val = filt_val;
 204         }
 205         else
 206             break;
 207
 208         // Adjust filter level
 209         filt_val -= (1 + ((filt_val > 10) ? 1 : 0));
 210     }
 211
 212     // Search up (note that we have already done filt_val = cm->filter_level)
 213     filt_val = cm->filter_level + (1 + ((filt_val > 10) ? 1 : 0));
 214
 215     if (best_filt_val == cm->filter_level)
 216     {
 217         // Resist raising filter level for very small gains
 218         best_err -= (best_err >> 10);
 219
 220         while (filt_val < max_filter_level)
 221         {
 222             // Apply the loop filter
 223             vp8_loop_filter_partial_frame(cm, &cpi->mb.e_mbd, filt_val);
 224
 225             // Get the err for filtered frame
 226             filt_err = vp8_calc_partial_ssl_err(sd, cm->frame_to_show, 3, IF_RTCD(&cpi->rtcd.variance));
 227
 228             //  Re-instate the unfiltered frame
 229             vp8_yv12_copy_partial_frame_ptr(&cpi->last_frame_uf, cm->frame_to_show, 3);
 230
 231             // Update the best case record or exit loop.
 232             if (filt_err < best_err)
 233             {
 234                 // Do not raise filter level if improvement is < 1 part in 4096
 235                 best_err = filt_err - (filt_err >> 10);
 236
 237                 best_filt_val = filt_val;
 238             }
 239             else
 240                 break;
 241
 242             // Adjust filter level
 243             filt_val += (1 + ((filt_val > 10) ? 1 : 0));
 244         }
 245     }
 246
 247     cm->filter_level = best_filt_val;
 248
 249     if (cm->filter_level < min_filter_level)
 250         cm->filter_level = min_filter_level;
 251
 252     if (cm->filter_level > max_filter_level)
 253         cm->filter_level = max_filter_level;
 254 }
 255
 256 // Stub function for now Alt LF not used
 257 void vp8cx_set_alt_lf_level(VP8_COMP *cpi, int filt_val)
 258 {
 259     MACROBLOCKD *mbd = &cpi->mb.e_mbd;
 260     (void) filt_val;
 261
 262     mbd->segment_feature_data[MB_LVL_ALT_LF][0] = cpi->segment_feature_data[MB_LVL_ALT_LF][0];
 263     mbd->segment_feature_data[MB_LVL_ALT_LF][1] = cpi->segment_feature_data[MB_LVL_ALT_LF][1];
 264     mbd->segment_feature_data[MB_LVL_ALT_LF][2] = cpi->segment_feature_data[MB_LVL_ALT_LF][2];
 265     mbd->segment_feature_data[MB_LVL_ALT_LF][3] = cpi->segment_feature_data[MB_LVL_ALT_LF][3];
 266 }
 267
 268 void vp8cx_pick_filter_level(YV12_BUFFER_CONFIG *sd, VP8_COMP *cpi)
 269 {
 270     VP8_COMMON *cm = &cpi->common;
 271
 272     int best_err = 0;
 273     int filt_err = 0;
 274     int min_filter_level = get_min_filter_level(cpi, cm->base_qindex);
 275     int max_filter_level = get_max_filter_level(cpi, cm->base_qindex);
 276
 277     int filter_step;
 278     int filt_high = 0;
 279     int filt_mid = cm->filter_level;      // Start search at previous frame filter level
 280     int filt_low = 0;
 281     int filt_best;
 282     int filt_direction = 0;
 283
 284     int Bias = 0;                       // Bias against raising loop filter and in favour of lowering it
 285
 286     //  Make a copy of the unfiltered / processed recon buffer
 287 #if HAVE_ARMV7
 288 #if CONFIG_RUNTIME_CPU_DETECT
 289     if (cm->rtcd.flags & HAS_NEON)
 290 #endif
 291     {
 292         vp8_yv12_copy_frame_yonly_no_extend_frame_borders_neon(cm->frame_to_show, &cpi->last_frame_uf);
 293     }
 294 #if CONFIG_RUNTIME_CPU_DETECT
 295     else
 296 #endif
 297 #endif
 298 #if !HAVE_ARMV7 || CONFIG_RUNTIME_CPU_DETECT
 299     {
 300         vp8_yv12_copy_frame_ptr(cm->frame_to_show, &cpi->last_frame_uf);
 301     }
 302 #endif
 303
 304     if (cm->frame_type == KEY_FRAME)
 305         cm->sharpness_level = 0;
 306     else
 307         cm->sharpness_level = cpi->oxcf.Sharpness;
 308
 309     // Start the search at the previous frame filter level unless it is now out of range.
 310     filt_mid = cm->filter_level;
 311
 312     if (filt_mid < min_filter_level)
 313         filt_mid = min_filter_level;
 314     else if (filt_mid > max_filter_level)
 315         filt_mid = max_filter_level;
 316
 317     // Define the initial step size
 318     filter_step = (filt_mid < 16) ? 4 : filt_mid / 4;
 319
 320     // Get baseline error score
 321     vp8cx_set_alt_lf_level(cpi, filt_mid);
 322     vp8_loop_filter_frame_yonly(cm, &cpi->mb.e_mbd, filt_mid);
 323
 324     best_err = vp8_calc_ss_err(sd, cm->frame_to_show, IF_RTCD(&cpi->rtcd.variance));
 325     filt_best = filt_mid;
 326
 327     //  Re-instate the unfiltered frame
 328 #if HAVE_ARMV7
 329 #if CONFIG_RUNTIME_CPU_DETECT
 330     if (cm->rtcd.flags & HAS_NEON)
 331 #endif
 332     {
 333         vp8_yv12_copy_frame_yonly_no_extend_frame_borders_neon(&cpi->last_frame_uf, cm->frame_to_show);
 334     }
 335 #if CONFIG_RUNTIME_CPU_DETECT
 336     else
 337 #endif
 338 #endif
 339 #if !HAVE_ARMV7 || CONFIG_RUNTIME_CPU_DETECT
 340     {
 341         vp8_yv12_copy_frame_yonly_ptr(&cpi->last_frame_uf, cm->frame_to_show);
 342     }
 343 #endif
 344
 345     while (filter_step > 0)
 346     {
 347         Bias = (best_err >> (15 - (filt_mid / 8))) * filter_step; //PGW change 12/12/06 for small images
 348
 349         // jbb chg: 20100118 - in sections with lots of new material coming in don't bias as much to a low filter value
 350         if (cpi->twopass.section_intra_rating < 20)
 351             Bias = Bias * cpi->twopass.section_intra_rating / 20;
 352
 353         filt_high = ((filt_mid + filter_step) > max_filter_level) ? max_filter_level : (filt_mid + filter_step);
 354         filt_low = ((filt_mid - filter_step) < min_filter_level) ? min_filter_level : (filt_mid - filter_step);
 355
 356         if ((filt_direction <= 0) && (filt_low != filt_mid))
 357         {
 358             // Get Low filter error score
 359             vp8cx_set_alt_lf_level(cpi, filt_low);
 360             vp8_loop_filter_frame_yonly(cm, &cpi->mb.e_mbd, filt_low);
 361
 362             filt_err = vp8_calc_ss_err(sd, cm->frame_to_show, IF_RTCD(&cpi->rtcd.variance));
 363
 364             //  Re-instate the unfiltered frame
 365 #if HAVE_ARMV7
 366 #if CONFIG_RUNTIME_CPU_DETECT
 367             if (cm->rtcd.flags & HAS_NEON)
 368 #endif
 369             {
 370                 vp8_yv12_copy_frame_yonly_no_extend_frame_borders_neon(&cpi->last_frame_uf, cm->frame_to_show);
 371             }
 372 #if CONFIG_RUNTIME_CPU_DETECT
 373             else
 374 #endif
 375 #endif
 376 #if !HAVE_ARMV7 || CONFIG_RUNTIME_CPU_DETECT
 377             {
 378                 vp8_yv12_copy_frame_yonly_ptr(&cpi->last_frame_uf, cm->frame_to_show);
 379             }
 380 #endif
 381
 382             // If value is close to the best so far then bias towards a lower loop filter value.
 383             if ((filt_err - Bias) < best_err)
 384             {
 385                 // Was it actually better than the previous best?
 386                 if (filt_err < best_err)
 387                     best_err = filt_err;
 388
 389                 filt_best = filt_low;
 390             }
 391         }
 392
 393         // Now look at filt_high
 394         if ((filt_direction >= 0) && (filt_high != filt_mid))
 395         {
 396             vp8cx_set_alt_lf_level(cpi, filt_high);
 397             vp8_loop_filter_frame_yonly(cm, &cpi->mb.e_mbd, filt_high);
 398
 399             filt_err = vp8_calc_ss_err(sd, cm->frame_to_show, IF_RTCD(&cpi->rtcd.variance));
 400
 401             //  Re-instate the unfiltered frame
 402 #if HAVE_ARMV7
 403 #if CONFIG_RUNTIME_CPU_DETECT
 404             if (cm->rtcd.flags & HAS_NEON)
 405 #endif
 406             {
 407                 vp8_yv12_copy_frame_yonly_no_extend_frame_borders_neon(&cpi->last_frame_uf, cm->frame_to_show);
 408             }
 409 #if CONFIG_RUNTIME_CPU_DETECT
 410             else
 411 #endif
 412 #endif
 413 #if !HAVE_ARMV7 || CONFIG_RUNTIME_CPU_DETECT
 414             {
 415                 vp8_yv12_copy_frame_yonly_ptr(&cpi->last_frame_uf, cm->frame_to_show);
 416             }
 417 #endif
 418
 419             // Was it better than the previous best?
 420             if (filt_err < (best_err - Bias))
 421             {
 422                 best_err = filt_err;
 423                 filt_best = filt_high;
 424             }
 425         }
 426
 427         // Half the step distance if the best filter value was the same as last time
 428         if (filt_best == filt_mid)
 429         {
 430             filter_step = filter_step / 2;
 431             filt_direction = 0;
 432         }
 433         else
 434         {
 435             filt_direction = (filt_best < filt_mid) ? -1 : 1;
 436             filt_mid = filt_best;
 437         }
 438     }
 439
 440     cm->filter_level = filt_best;
 441 }