vp9_firstpass.c 84.5 KB
Newer Older
John Koleszar's avatar
John Koleszar committed
1
/*
2
 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
John Koleszar's avatar
John Koleszar committed
3
 *
4
 *  Use of this source code is governed by a BSD-style license
5 6
 *  that can be found in the LICENSE file in the root of the source
 *  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.
John Koleszar's avatar
John Koleszar committed
9 10 11 12
 */

#include "math.h"
#include "limits.h"
13 14 15 16
#include "vp9/encoder/vp9_block.h"
#include "vp9/encoder/vp9_onyx_int.h"
#include "vp9/encoder/vp9_variance.h"
#include "vp9/encoder/vp9_encodeintra.h"
17
#include "vp9/common/vp9_setupintrarecon.h"
18 19
#include "vp9/encoder/vp9_mcomp.h"
#include "vp9/encoder/vp9_firstpass.h"
Johann's avatar
Johann committed
20
#include "vpx_scale/vpx_scale.h"
21
#include "vp9/encoder/vp9_encodeframe.h"
22
#include "vp9/encoder/vp9_encodemb.h"
23 24
#include "vp9/common/vp9_extend.h"
#include "vp9/common/vp9_systemdependent.h"
John Koleszar's avatar
John Koleszar committed
25
#include "vpx_mem/vpx_mem.h"
26
#include "vp9/common/vp9_swapyv12buffer.h"
John Koleszar's avatar
John Koleszar committed
27
#include <stdio.h>
28
#include "vp9/encoder/vp9_quantize.h"
29 30
#include "vp9/encoder/vp9_rdopt.h"
#include "vp9/encoder/vp9_ratectrl.h"
31 32
#include "vp9/common/vp9_quant_common.h"
#include "vp9/common/vp9_entropymv.h"
33
#include "vp9/encoder/vp9_encodemv.h"
34
#include "./vpx_scale_rtcd.h"
John Koleszar's avatar
John Koleszar committed
35

36
#define OUTPUT_FPF 0
John Koleszar's avatar
John Koleszar committed
37

38 39
#define IIFACTOR   12.5
#define IIKFACTOR1 12.5
40 41
#define IIKFACTOR2 15.0
#define RMAX       128.0
42
#define GF_RMAX    96.0
Paul Wilkins's avatar
Paul Wilkins committed
43
#define ERR_DIVISOR   150.0
44
#define MIN_DECAY_FACTOR 0.1
John Koleszar's avatar
John Koleszar committed
45

46 47
#define KF_MB_INTRA_MIN 150
#define GF_MB_INTRA_MIN 100
Paul Wilkins's avatar
CQ Mode  
Paul Wilkins committed
48

John Koleszar's avatar
John Koleszar committed
49 50 51 52 53
#define DOUBLE_DIVIDE_CHECK(X) ((X)<0?(X)-.000001:(X)+.000001)

#define POW1 (double)cpi->oxcf.two_pass_vbrbias/100.0
#define POW2 (double)cpi->oxcf.two_pass_vbrbias/100.0

54
static void find_next_key_frame(VP9_COMP *cpi, FIRSTPASS_STATS *this_frame);
Paul Wilkins's avatar
Paul Wilkins committed
55

John Koleszar's avatar
John Koleszar committed
56 57 58
static int select_cq_level(int qindex) {
  int ret_val = QINDEX_RANGE - 1;
  int i;
Paul Wilkins's avatar
Paul Wilkins committed
59

60
  double target_q = (vp9_convert_qindex_to_q(qindex) * 0.5847) + 1.0;
Paul Wilkins's avatar
Paul Wilkins committed
61

John Koleszar's avatar
John Koleszar committed
62
  for (i = 0; i < QINDEX_RANGE; i++) {
63
    if (target_q <= vp9_convert_qindex_to_q(i)) {
John Koleszar's avatar
John Koleszar committed
64 65
      ret_val = i;
      break;
Paul Wilkins's avatar
Paul Wilkins committed
66
    }
John Koleszar's avatar
John Koleszar committed
67
  }
Paul Wilkins's avatar
Paul Wilkins committed
68

John Koleszar's avatar
John Koleszar committed
69
  return ret_val;
Paul Wilkins's avatar
Paul Wilkins committed
70
}
Paul Wilkins's avatar
CQ Mode  
Paul Wilkins committed
71

John Koleszar's avatar
John Koleszar committed
72 73

// Resets the first pass file to the given position using a relative seek from the current position
74
static void reset_fpf_position(VP9_COMP *cpi, FIRSTPASS_STATS *Position) {
John Koleszar's avatar
John Koleszar committed
75
  cpi->twopass.stats_in = Position;
John Koleszar's avatar
John Koleszar committed
76 77
}

78
static int lookup_next_frame_stats(VP9_COMP *cpi, FIRSTPASS_STATS *next_frame) {
John Koleszar's avatar
John Koleszar committed
79 80
  if (cpi->twopass.stats_in >= cpi->twopass.stats_in_end)
    return EOF;
John Koleszar's avatar
John Koleszar committed
81

John Koleszar's avatar
John Koleszar committed
82 83
  *next_frame = *cpi->twopass.stats_in;
  return 1;
John Koleszar's avatar
John Koleszar committed
84 85
}

86
// Read frame stats at an offset from the current position
87
static int read_frame_stats(VP9_COMP *cpi,
John Koleszar's avatar
John Koleszar committed
88 89 90 91 92 93 94 95 96 97 98 99 100 101 102
                            FIRSTPASS_STATS *frame_stats,
                            int offset) {
  FIRSTPASS_STATS *fps_ptr = cpi->twopass.stats_in;

  // Check legality of offset
  if (offset >= 0) {
    if (&fps_ptr[offset] >= cpi->twopass.stats_in_end)
      return EOF;
  } else if (offset < 0) {
    if (&fps_ptr[offset] < cpi->twopass.stats_in_start)
      return EOF;
  }

  *frame_stats = fps_ptr[offset];
  return 1;
103 104
}

105
static int input_stats(VP9_COMP *cpi, FIRSTPASS_STATS *fps) {
John Koleszar's avatar
John Koleszar committed
106 107
  if (cpi->twopass.stats_in >= cpi->twopass.stats_in_end)
    return EOF;
108

John Koleszar's avatar
John Koleszar committed
109 110 111 112
  *fps = *cpi->twopass.stats_in;
  cpi->twopass.stats_in =
    (void *)((char *)cpi->twopass.stats_in + sizeof(FIRSTPASS_STATS));
  return 1;
113 114
}

115
static void output_stats(const VP9_COMP            *cpi,
116
                         struct vpx_codec_pkt_list *pktlist,
John Koleszar's avatar
John Koleszar committed
117 118 119 120 121 122
                         FIRSTPASS_STATS            *stats) {
  struct vpx_codec_cx_pkt pkt;
  pkt.kind = VPX_CODEC_STATS_PKT;
  pkt.data.twopass_stats.buf = stats;
  pkt.data.twopass_stats.sz = sizeof(FIRSTPASS_STATS);
  vpx_codec_pkt_list_add(pktlist, &pkt);
123 124 125 126

// TEMP debug code
#if OUTPUT_FPF

John Koleszar's avatar
John Koleszar committed
127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154
  {
    FILE *fpfile;
    fpfile = fopen("firstpass.stt", "a");

    fprintf(fpfile, "%12.0f %12.0f %12.0f %12.0f %12.0f %12.4f %12.4f"
            "%12.4f %12.4f %12.4f %12.4f %12.4f %12.4f %12.4f"
            "%12.0f %12.0f %12.4f %12.0f %12.0f %12.4f\n",
            stats->frame,
            stats->intra_error,
            stats->coded_error,
            stats->sr_coded_error,
            stats->ssim_weighted_pred_err,
            stats->pcnt_inter,
            stats->pcnt_motion,
            stats->pcnt_second_ref,
            stats->pcnt_neutral,
            stats->MVr,
            stats->mvr_abs,
            stats->MVc,
            stats->mvc_abs,
            stats->MVrv,
            stats->MVcv,
            stats->mv_in_out_count,
            stats->new_mv_count,
            stats->count,
            stats->duration);
    fclose(fpfile);
  }
155 156 157
#endif
}

John Koleszar's avatar
John Koleszar committed
158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177
static void zero_stats(FIRSTPASS_STATS *section) {
  section->frame      = 0.0;
  section->intra_error = 0.0;
  section->coded_error = 0.0;
  section->sr_coded_error = 0.0;
  section->ssim_weighted_pred_err = 0.0;
  section->pcnt_inter  = 0.0;
  section->pcnt_motion  = 0.0;
  section->pcnt_second_ref = 0.0;
  section->pcnt_neutral = 0.0;
  section->MVr        = 0.0;
  section->mvr_abs     = 0.0;
  section->MVc        = 0.0;
  section->mvc_abs     = 0.0;
  section->MVrv       = 0.0;
  section->MVcv       = 0.0;
  section->mv_in_out_count  = 0.0;
  section->new_mv_count = 0.0;
  section->count      = 0.0;
  section->duration   = 1.0;
178 179
}

John Koleszar's avatar
John Koleszar committed
180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199
static void accumulate_stats(FIRSTPASS_STATS *section, FIRSTPASS_STATS *frame) {
  section->frame += frame->frame;
  section->intra_error += frame->intra_error;
  section->coded_error += frame->coded_error;
  section->sr_coded_error += frame->sr_coded_error;
  section->ssim_weighted_pred_err += frame->ssim_weighted_pred_err;
  section->pcnt_inter  += frame->pcnt_inter;
  section->pcnt_motion += frame->pcnt_motion;
  section->pcnt_second_ref += frame->pcnt_second_ref;
  section->pcnt_neutral += frame->pcnt_neutral;
  section->MVr        += frame->MVr;
  section->mvr_abs     += frame->mvr_abs;
  section->MVc        += frame->MVc;
  section->mvc_abs     += frame->mvc_abs;
  section->MVrv       += frame->MVrv;
  section->MVcv       += frame->MVcv;
  section->mv_in_out_count  += frame->mv_in_out_count;
  section->new_mv_count += frame->new_mv_count;
  section->count      += frame->count;
  section->duration   += frame->duration;
200 201
}

John Koleszar's avatar
John Koleszar committed
202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221
static void subtract_stats(FIRSTPASS_STATS *section, FIRSTPASS_STATS *frame) {
  section->frame -= frame->frame;
  section->intra_error -= frame->intra_error;
  section->coded_error -= frame->coded_error;
  section->sr_coded_error -= frame->sr_coded_error;
  section->ssim_weighted_pred_err -= frame->ssim_weighted_pred_err;
  section->pcnt_inter  -= frame->pcnt_inter;
  section->pcnt_motion -= frame->pcnt_motion;
  section->pcnt_second_ref -= frame->pcnt_second_ref;
  section->pcnt_neutral -= frame->pcnt_neutral;
  section->MVr        -= frame->MVr;
  section->mvr_abs     -= frame->mvr_abs;
  section->MVc        -= frame->MVc;
  section->mvc_abs     -= frame->mvc_abs;
  section->MVrv       -= frame->MVrv;
  section->MVcv       -= frame->MVcv;
  section->mv_in_out_count  -= frame->mv_in_out_count;
  section->new_mv_count -= frame->new_mv_count;
  section->count      -= frame->count;
  section->duration   -= frame->duration;
222 223
}

John Koleszar's avatar
John Koleszar committed
224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243
static void avg_stats(FIRSTPASS_STATS *section) {
  if (section->count < 1.0)
    return;

  section->intra_error /= section->count;
  section->coded_error /= section->count;
  section->sr_coded_error /= section->count;
  section->ssim_weighted_pred_err /= section->count;
  section->pcnt_inter  /= section->count;
  section->pcnt_second_ref /= section->count;
  section->pcnt_neutral /= section->count;
  section->pcnt_motion /= section->count;
  section->MVr        /= section->count;
  section->mvr_abs     /= section->count;
  section->MVc        /= section->count;
  section->mvc_abs     /= section->count;
  section->MVrv       /= section->count;
  section->MVcv       /= section->count;
  section->mv_in_out_count   /= section->count;
  section->duration   /= section->count;
244 245
}

John Koleszar's avatar
John Koleszar committed
246
// Calculate a modified Error used in distributing bits between easier and harder frames
247
static double calculate_modified_err(VP9_COMP *cpi, FIRSTPASS_STATS *this_frame) {
John Koleszar's avatar
John Koleszar committed
248 249 250 251 252 253 254 255 256 257 258
  double av_err = (cpi->twopass.total_stats->ssim_weighted_pred_err /
                   cpi->twopass.total_stats->count);
  double this_err = this_frame->ssim_weighted_pred_err;
  double modified_err;

  if (this_err > av_err)
    modified_err = av_err * pow((this_err / DOUBLE_DIVIDE_CHECK(av_err)), POW1);
  else
    modified_err = av_err * pow((this_err / DOUBLE_DIVIDE_CHECK(av_err)), POW2);

  return modified_err;
John Koleszar's avatar
John Koleszar committed
259 260
}

261
static const double weight_table[256] = {
John Koleszar's avatar
John Koleszar committed
262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293
  0.020000, 0.020000, 0.020000, 0.020000, 0.020000, 0.020000, 0.020000, 0.020000,
  0.020000, 0.020000, 0.020000, 0.020000, 0.020000, 0.020000, 0.020000, 0.020000,
  0.020000, 0.020000, 0.020000, 0.020000, 0.020000, 0.020000, 0.020000, 0.020000,
  0.020000, 0.020000, 0.020000, 0.020000, 0.020000, 0.020000, 0.020000, 0.020000,
  0.020000, 0.031250, 0.062500, 0.093750, 0.125000, 0.156250, 0.187500, 0.218750,
  0.250000, 0.281250, 0.312500, 0.343750, 0.375000, 0.406250, 0.437500, 0.468750,
  0.500000, 0.531250, 0.562500, 0.593750, 0.625000, 0.656250, 0.687500, 0.718750,
  0.750000, 0.781250, 0.812500, 0.843750, 0.875000, 0.906250, 0.937500, 0.968750,
  1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
  1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
  1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
  1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
  1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
  1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
  1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
  1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
  1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
  1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
  1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
  1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
  1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
  1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
  1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
  1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
  1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
  1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
  1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
  1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
  1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
  1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
  1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000,
  1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000
294 295
};

John Koleszar's avatar
John Koleszar committed
296 297 298
static double simple_weight(YV12_BUFFER_CONFIG *source) {
  int i, j;

299
  uint8_t *src = source->y_buffer;
John Koleszar's avatar
John Koleszar committed
300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316
  double sum_weights = 0.0;

  // Loop throught the Y plane raw examining levels and creating a weight for the image
  i = source->y_height;
  do {
    j = source->y_width;
    do {
      sum_weights += weight_table[ *src];
      src++;
    } while (--j);
    src -= source->y_width;
    src += source->y_stride;
  } while (--i);

  sum_weights /= (source->y_height * source->y_width);

  return sum_weights;
John Koleszar's avatar
John Koleszar committed
317 318
}

319

John Koleszar's avatar
John Koleszar committed
320
// This function returns the current per frame maximum bitrate target
321
static int frame_max_bits(VP9_COMP *cpi) {
John Koleszar's avatar
John Koleszar committed
322 323
  // Max allocation for a single frame based on the max section guidelines passed in and how many bits are left
  int max_bits;
John Koleszar's avatar
John Koleszar committed
324

John Koleszar's avatar
John Koleszar committed
325 326
  // For VBR base this on the bits and frames left plus the two_pass_vbrmax_section rate passed in by the user
  max_bits = (int)(((double)cpi->twopass.bits_left / (cpi->twopass.total_stats->count - (double)cpi->common.current_video_frame)) * ((double)cpi->oxcf.two_pass_vbrmax_section / 100.0));
John Koleszar's avatar
John Koleszar committed
327

John Koleszar's avatar
John Koleszar committed
328 329 330
  // Trap case where we are out of bits
  if (max_bits < 0)
    max_bits = 0;
John Koleszar's avatar
John Koleszar committed
331

John Koleszar's avatar
John Koleszar committed
332
  return max_bits;
John Koleszar's avatar
John Koleszar committed
333 334
}

335
void vp9_init_first_pass(VP9_COMP *cpi) {
John Koleszar's avatar
John Koleszar committed
336
  zero_stats(cpi->twopass.total_stats);
John Koleszar's avatar
John Koleszar committed
337 338
}

339
void vp9_end_first_pass(VP9_COMP *cpi) {
John Koleszar's avatar
John Koleszar committed
340
  output_stats(cpi, cpi->output_pkt_list, cpi->twopass.total_stats);
341
}
John Koleszar's avatar
John Koleszar committed
342

343
static void zz_motion_search(VP9_COMP *cpi, MACROBLOCK *x, YV12_BUFFER_CONFIG *recon_buffer, int *best_motion_err, int recon_yoffset) {
John Koleszar's avatar
John Koleszar committed
344
  MACROBLOCKD *const xd = &x->e_mbd;
John Koleszar's avatar
John Koleszar committed
345 346
  BLOCK *b = &x->block[0];
  BLOCKD *d = &x->e_mbd.block[0];
John Koleszar's avatar
John Koleszar committed
347

348
  uint8_t *src_ptr = (*(b->base_src) + b->src);
John Koleszar's avatar
John Koleszar committed
349
  int src_stride = b->src_stride;
350
  uint8_t *ref_ptr;
John Koleszar's avatar
John Koleszar committed
351
  int ref_stride = d->pre_stride;
John Koleszar's avatar
John Koleszar committed
352

John Koleszar's avatar
John Koleszar committed
353 354
  // Set up pointers for this macro block recon buffer
  xd->pre.y_buffer = recon_buffer->y_buffer + recon_yoffset;
John Koleszar's avatar
John Koleszar committed
355

356
  ref_ptr = (uint8_t *)(*(d->base_pre) + d->pre);
John Koleszar's avatar
John Koleszar committed
357

358
  vp9_mse16x16(src_ptr, src_stride, ref_ptr, ref_stride,
359
               (unsigned int *)(best_motion_err));
John Koleszar's avatar
John Koleszar committed
360 361
}

362
static void first_pass_motion_search(VP9_COMP *cpi, MACROBLOCK *x,
Scott LaVarnway's avatar
Scott LaVarnway committed
363 364
                                     int_mv *ref_mv, MV *best_mv,
                                     YV12_BUFFER_CONFIG *recon_buffer,
John Koleszar's avatar
John Koleszar committed
365
                                     int *best_motion_err, int recon_yoffset) {
John Koleszar's avatar
John Koleszar committed
366
  MACROBLOCKD *const xd = &x->e_mbd;
John Koleszar's avatar
John Koleszar committed
367 368 369 370 371 372 373 374 375 376 377
  BLOCK *b = &x->block[0];
  BLOCKD *d = &x->e_mbd.block[0];
  int num00;

  int_mv tmp_mv;
  int_mv ref_mv_full;

  int tmp_err;
  int step_param = 3;
  int further_steps = (MAX_MVSEARCH_STEPS - 1) - step_param;
  int n;
378
  vp9_variance_fn_ptr_t v_fn_ptr = cpi->fn_ptr[BLOCK_16X16];
John Koleszar's avatar
John Koleszar committed
379 380 381
  int new_mv_mode_penalty = 256;

  // override the default variance function to use MSE
382
  v_fn_ptr.vf = vp9_mse16x16;
John Koleszar's avatar
John Koleszar committed
383 384 385 386 387 388 389 390 391 392

  // Set up pointers for this macro block recon buffer
  xd->pre.y_buffer = recon_buffer->y_buffer + recon_yoffset;

  // Initial step/diamond search centred on best mv
  tmp_mv.as_int = 0;
  ref_mv_full.as_mv.col = ref_mv->as_mv.col >> 3;
  ref_mv_full.as_mv.row = ref_mv->as_mv.row >> 3;
  tmp_err = cpi->diamond_search_sad(x, b, d, &ref_mv_full, &tmp_mv, step_param,
                                    x->sadperbit16, &num00, &v_fn_ptr,
393 394
                                    x->nmvjointcost,
                                    x->mvcost, ref_mv);
John Koleszar's avatar
John Koleszar committed
395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416
  if (tmp_err < INT_MAX - new_mv_mode_penalty)
    tmp_err += new_mv_mode_penalty;

  if (tmp_err < *best_motion_err) {
    *best_motion_err = tmp_err;
    best_mv->row = tmp_mv.as_mv.row;
    best_mv->col = tmp_mv.as_mv.col;
  }

  // Further step/diamond searches as necessary
  n = num00;
  num00 = 0;

  while (n < further_steps) {
    n++;

    if (num00)
      num00--;
    else {
      tmp_err = cpi->diamond_search_sad(x, b, d, &ref_mv_full, &tmp_mv,
                                        step_param + n, x->sadperbit16,
                                        &num00, &v_fn_ptr,
417 418
                                        x->nmvjointcost,
                                        x->mvcost, ref_mv);
John Koleszar's avatar
John Koleszar committed
419
      if (tmp_err < INT_MAX - new_mv_mode_penalty)
John Koleszar's avatar
John Koleszar committed
420 421
        tmp_err += new_mv_mode_penalty;

John Koleszar's avatar
John Koleszar committed
422
      if (tmp_err < *best_motion_err) {
John Koleszar's avatar
John Koleszar committed
423
        *best_motion_err = tmp_err;
Scott LaVarnway's avatar
Scott LaVarnway committed
424 425
        best_mv->row = tmp_mv.as_mv.row;
        best_mv->col = tmp_mv.as_mv.col;
John Koleszar's avatar
John Koleszar committed
426
      }
John Koleszar's avatar
John Koleszar committed
427
    }
John Koleszar's avatar
John Koleszar committed
428
  }
John Koleszar's avatar
John Koleszar committed
429 430
}

431
void vp9_first_pass(VP9_COMP *cpi) {
John Koleszar's avatar
John Koleszar committed
432
  int mb_row, mb_col;
John Koleszar's avatar
John Koleszar committed
433
  MACROBLOCK *const x = &cpi->mb;
434
  VP9_COMMON *const cm = &cpi->common;
John Koleszar's avatar
John Koleszar committed
435
  MACROBLOCKD *const xd = &x->e_mbd;
John Koleszar's avatar
John Koleszar committed
436 437

  int recon_yoffset, recon_uvoffset;
438 439
  YV12_BUFFER_CONFIG *lst_yv12 =
      &cm->yv12_fb[cm->active_ref_idx[cpi->lst_fb_idx]];
John Koleszar's avatar
John Koleszar committed
440
  YV12_BUFFER_CONFIG *new_yv12 = &cm->yv12_fb[cm->new_fb_idx];
441 442
  YV12_BUFFER_CONFIG *gld_yv12 =
      &cm->yv12_fb[cm->active_ref_idx[cpi->gld_fb_idx]];
John Koleszar's avatar
John Koleszar committed
443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464
  int recon_y_stride = lst_yv12->y_stride;
  int recon_uv_stride = lst_yv12->uv_stride;
  int64_t intra_error = 0;
  int64_t coded_error = 0;
  int64_t sr_coded_error = 0;

  int sum_mvr = 0, sum_mvc = 0;
  int sum_mvr_abs = 0, sum_mvc_abs = 0;
  int sum_mvrs = 0, sum_mvcs = 0;
  int mvcount = 0;
  int intercount = 0;
  int second_ref_count = 0;
  int intrapenalty = 256;
  int neutral_count = 0;
  int new_mv_count = 0;
  int sum_in_vectors = 0;
  uint32_t lastmv_as_int = 0;

  int_mv zero_ref_mv;

  zero_ref_mv.as_int = 0;

465
  vp9_clear_system_state();  // __asm emms;
John Koleszar's avatar
John Koleszar committed
466 467 468 469 470 471 472 473 474

  x->src = * cpi->Source;
  xd->pre = *lst_yv12;
  xd->dst = *new_yv12;

  x->partition_info = x->pi;

  xd->mode_info_context = cm->mi;

475
  vp9_build_block_offsets(x);
John Koleszar's avatar
John Koleszar committed
476

477
  vp9_setup_block_dptrs(&x->e_mbd);
John Koleszar's avatar
John Koleszar committed
478

479
  vp9_setup_block_ptrs(x);
John Koleszar's avatar
John Koleszar committed
480 481

  // set up frame new frame for intra coded blocks
482
  vp9_setup_intra_recon(new_yv12);
483
  vp9_frame_init_quantizer(cpi);
John Koleszar's avatar
John Koleszar committed
484 485 486 487 488

  // Initialise the MV cost table to the defaults
  // if( cm->current_video_frame == 0)
  // if ( 0 )
  {
489
    vp9_init_mv_probs(cm);
490
    vp9_initialize_rd_consts(cpi, cm->base_qindex + cm->y1dc_delta_q);
John Koleszar's avatar
John Koleszar committed
491 492 493 494 495 496 497 498 499 500 501 502 503 504
  }

  // for each macroblock row in image
  for (mb_row = 0; mb_row < cm->mb_rows; mb_row++) {
    int_mv best_ref_mv;

    best_ref_mv.as_int = 0;

    // reset above block coeffs
    xd->up_available = (mb_row != 0);
    recon_yoffset = (mb_row * recon_y_stride * 16);
    recon_uvoffset = (mb_row * recon_uv_stride * 8);

    // Set up limit values for motion vectors to prevent them extending outside the UMV borders
John Koleszar's avatar
John Koleszar committed
505 506 507
    x->mv_row_min = -((mb_row * 16) + (VP9BORDERINPIXELS - 16));
    x->mv_row_max = ((cm->mb_rows - 1 - mb_row) * 16)
                    + (VP9BORDERINPIXELS - 16);
John Koleszar's avatar
John Koleszar committed
508 509 510 511 512 513 514 515 516 517 518 519 520 521


    // for each macroblock col in image
    for (mb_col = 0; mb_col < cm->mb_cols; mb_col++) {
      int this_error;
      int gf_motion_error = INT_MAX;
      int use_dc_pred = (mb_col || mb_row) && (!mb_col || !mb_row);

      xd->dst.y_buffer = new_yv12->y_buffer + recon_yoffset;
      xd->dst.u_buffer = new_yv12->u_buffer + recon_uvoffset;
      xd->dst.v_buffer = new_yv12->v_buffer + recon_uvoffset;
      xd->left_available = (mb_col != 0);

      // do intra 16x16 prediction
522
      this_error = vp9_encode_intra(cpi, x, use_dc_pred);
John Koleszar's avatar
John Koleszar committed
523 524 525 526 527 528 529 530 531 532 533

      // "intrapenalty" below deals with situations where the intra and inter error scores are very low (eg a plain black frame)
      // We do not have special cases in first pass for 0,0 and nearest etc so all inter modes carry an overhead cost estimate fot the mv.
      // When the error score is very low this causes us to pick all or lots of INTRA modes and throw lots of key frames.
      // This penalty adds a cost matching that of a 0,0 mv to the intra case.
      this_error += intrapenalty;

      // Cumulative intra error total
      intra_error += (int64_t)this_error;

      // Set up limit values for motion vectors to prevent them extending outside the UMV borders
John Koleszar's avatar
John Koleszar committed
534 535 536
      x->mv_col_min = -((mb_col * 16) + (VP9BORDERINPIXELS - 16));
      x->mv_col_max = ((cm->mb_cols - 1 - mb_col) * 16)
                      + (VP9BORDERINPIXELS - 16);
John Koleszar's avatar
John Koleszar committed
537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564

      // Other than for the first frame do a motion search
      if (cm->current_video_frame > 0) {
        int tmp_err;
        int motion_error = INT_MAX;
        int_mv mv, tmp_mv;

        // Simple 0,0 motion with no mv overhead
        zz_motion_search(cpi, x, lst_yv12, &motion_error, recon_yoffset);
        mv.as_int = tmp_mv.as_int = 0;

        // Test last reference frame using the previous best mv as the
        // starting point (best reference) for the search
        first_pass_motion_search(cpi, x, &best_ref_mv,
                                 &mv.as_mv, lst_yv12,
                                 &motion_error, recon_yoffset);

        // If the current best reference mv is not centred on 0,0 then do a 0,0 based search as well
        if (best_ref_mv.as_int) {
          tmp_err = INT_MAX;
          first_pass_motion_search(cpi, x, &zero_ref_mv, &tmp_mv.as_mv,
                                   lst_yv12, &tmp_err, recon_yoffset);

          if (tmp_err < motion_error) {
            motion_error = tmp_err;
            mv.as_int = tmp_mv.as_int;
          }
        }
John Koleszar's avatar
John Koleszar committed
565

John Koleszar's avatar
John Koleszar committed
566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595
        // Experimental search in an older reference frame
        if (cm->current_video_frame > 1) {
          // Simple 0,0 motion with no mv overhead
          zz_motion_search(cpi, x, gld_yv12,
                           &gf_motion_error, recon_yoffset);

          first_pass_motion_search(cpi, x, &zero_ref_mv,
                                   &tmp_mv.as_mv, gld_yv12,
                                   &gf_motion_error, recon_yoffset);

          if ((gf_motion_error < motion_error) &&
              (gf_motion_error < this_error)) {
            second_ref_count++;
          }

          // Reset to last frame as reference buffer
          xd->pre.y_buffer = lst_yv12->y_buffer + recon_yoffset;
          xd->pre.u_buffer = lst_yv12->u_buffer + recon_uvoffset;
          xd->pre.v_buffer = lst_yv12->v_buffer + recon_uvoffset;

          // In accumulating a score for the older reference frame
          // take the best of the motion predicted score and
          // the intra coded error (just as will be done for)
          // accumulation of "coded_error" for the last frame.
          if (gf_motion_error < this_error)
            sr_coded_error += gf_motion_error;
          else
            sr_coded_error += this_error;
        } else
          sr_coded_error += motion_error;
596

John Koleszar's avatar
John Koleszar committed
597
        /* Intra assumed best */
598
        best_ref_mv.as_int = 0;
John Koleszar's avatar
John Koleszar committed
599

John Koleszar's avatar
John Koleszar committed
600 601 602 603 604 605 606 607 608 609 610 611 612 613
        if (motion_error <= this_error) {
          // Keep a count of cases where the inter and intra were
          // very close and very low. This helps with scene cut
          // detection for example in cropped clips with black bars
          // at the sides or top and bottom.
          if ((((this_error - intrapenalty) * 9) <=
               (motion_error * 10)) &&
              (this_error < (2 * intrapenalty))) {
            neutral_count++;
          }

          mv.as_mv.row <<= 3;
          mv.as_mv.col <<= 3;
          this_error = motion_error;
614
          vp9_set_mbmode_and_mvs(x, NEWMV, &mv);
615
          xd->mode_info_context->mbmi.txfm_size = TX_4X4;
616
          vp9_encode_inter16x16y(x, mb_row, mb_col);
John Koleszar's avatar
John Koleszar committed
617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646
          sum_mvr += mv.as_mv.row;
          sum_mvr_abs += abs(mv.as_mv.row);
          sum_mvc += mv.as_mv.col;
          sum_mvc_abs += abs(mv.as_mv.col);
          sum_mvrs += mv.as_mv.row * mv.as_mv.row;
          sum_mvcs += mv.as_mv.col * mv.as_mv.col;
          intercount++;

          best_ref_mv.as_int = mv.as_int;

          // Was the vector non-zero
          if (mv.as_int) {
            mvcount++;

            // Was it different from the last non zero vector
            if (mv.as_int != lastmv_as_int)
              new_mv_count++;
            lastmv_as_int = mv.as_int;

            // Does the Row vector point inwards or outwards
            if (mb_row < cm->mb_rows / 2) {
              if (mv.as_mv.row > 0)
                sum_in_vectors--;
              else if (mv.as_mv.row < 0)
                sum_in_vectors++;
            } else if (mb_row > cm->mb_rows / 2) {
              if (mv.as_mv.row > 0)
                sum_in_vectors++;
              else if (mv.as_mv.row < 0)
                sum_in_vectors--;
John Koleszar's avatar
John Koleszar committed
647 648
            }

John Koleszar's avatar
John Koleszar committed
649 650 651 652 653 654 655 656 657 658 659 660 661
            // Does the Row vector point inwards or outwards
            if (mb_col < cm->mb_cols / 2) {
              if (mv.as_mv.col > 0)
                sum_in_vectors--;
              else if (mv.as_mv.col < 0)
                sum_in_vectors++;
            } else if (mb_col > cm->mb_cols / 2) {
              if (mv.as_mv.col > 0)
                sum_in_vectors++;
              else if (mv.as_mv.col < 0)
                sum_in_vectors--;
            }
          }
John Koleszar's avatar
John Koleszar committed
662
        }
John Koleszar's avatar
John Koleszar committed
663 664
      } else
        sr_coded_error += (int64_t)this_error;
John Koleszar's avatar
John Koleszar committed
665

John Koleszar's avatar
John Koleszar committed
666
      coded_error += (int64_t)this_error;
John Koleszar's avatar
John Koleszar committed
667

John Koleszar's avatar
John Koleszar committed
668 669 670 671
      // adjust to the next column of macroblocks
      x->src.y_buffer += 16;
      x->src.u_buffer += 8;
      x->src.v_buffer += 8;
John Koleszar's avatar
John Koleszar committed
672

John Koleszar's avatar
John Koleszar committed
673 674
      recon_yoffset += 16;
      recon_uvoffset += 8;
John Koleszar's avatar
John Koleszar committed
675 676
    }

John Koleszar's avatar
John Koleszar committed
677 678 679 680 681 682
    // adjust to the next row of mbs
    x->src.y_buffer += 16 * x->src.y_stride - 16 * cm->mb_cols;
    x->src.u_buffer += 8 * x->src.uv_stride - 8 * cm->mb_cols;
    x->src.v_buffer += 8 * x->src.uv_stride - 8 * cm->mb_cols;

    // extend the recon for intra prediction
683 684
    vp9_extend_mb_row(new_yv12, xd->dst.y_buffer + 16,
                      xd->dst.u_buffer + 8, xd->dst.v_buffer + 8);
685
    vp9_clear_system_state();  // __asm emms;
John Koleszar's avatar
John Koleszar committed
686 687
  }

688
  vp9_clear_system_state();  // __asm emms;
John Koleszar's avatar
John Koleszar committed
689 690 691 692 693 694
  {
    double weight = 0.0;

    FIRSTPASS_STATS fps;

    fps.frame      = cm->current_video_frame;
695 696 697
    fps.intra_error = (double)(intra_error >> 8);
    fps.coded_error = (double)(coded_error >> 8);
    fps.sr_coded_error = (double)(sr_coded_error >> 8);
John Koleszar's avatar
John Koleszar committed
698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732
    weight = simple_weight(cpi->Source);


    if (weight < 0.1)
      weight = 0.1;

    fps.ssim_weighted_pred_err = fps.coded_error * weight;

    fps.pcnt_inter  = 0.0;
    fps.pcnt_motion = 0.0;
    fps.MVr        = 0.0;
    fps.mvr_abs     = 0.0;
    fps.MVc        = 0.0;
    fps.mvc_abs     = 0.0;
    fps.MVrv       = 0.0;
    fps.MVcv       = 0.0;
    fps.mv_in_out_count  = 0.0;
    fps.new_mv_count = 0.0;
    fps.count      = 1.0;

    fps.pcnt_inter   = 1.0 * (double)intercount / cm->MBs;
    fps.pcnt_second_ref = 1.0 * (double)second_ref_count / cm->MBs;
    fps.pcnt_neutral = 1.0 * (double)neutral_count / cm->MBs;

    if (mvcount > 0) {
      fps.MVr = (double)sum_mvr / (double)mvcount;
      fps.mvr_abs = (double)sum_mvr_abs / (double)mvcount;
      fps.MVc = (double)sum_mvc / (double)mvcount;
      fps.mvc_abs = (double)sum_mvc_abs / (double)mvcount;
      fps.MVrv = ((double)sum_mvrs - (fps.MVr * fps.MVr / (double)mvcount)) / (double)mvcount;
      fps.MVcv = ((double)sum_mvcs - (fps.MVc * fps.MVc / (double)mvcount)) / (double)mvcount;
      fps.mv_in_out_count = (double)sum_in_vectors / (double)(mvcount * 2);
      fps.new_mv_count = new_mv_count;

      fps.pcnt_motion = 1.0 * (double)mvcount / cpi->common.MBs;
Paul Wilkins's avatar
Paul Wilkins committed
733
    }
John Koleszar's avatar
John Koleszar committed
734

John Koleszar's avatar
John Koleszar committed
735 736
    // TODO:  handle the case when duration is set to 0, or something less
    // than the full time between subsequent cpi->source_time_stamp s  .
737 738
    fps.duration = (double)(cpi->source->ts_end
                            - cpi->source->ts_start);
John Koleszar's avatar
John Koleszar committed
739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754

    // don't want to do output stats with a stack variable!
    memcpy(cpi->twopass.this_frame_stats,
           &fps,
           sizeof(FIRSTPASS_STATS));
    output_stats(cpi, cpi->output_pkt_list, cpi->twopass.this_frame_stats);
    accumulate_stats(cpi->twopass.total_stats, &fps);
  }

  // Copy the previous Last Frame back into gf and and arf buffers if
  // the prediction is good enough... but also dont allow it to lag too far
  if ((cpi->twopass.sr_update_lag > 3) ||
      ((cm->current_video_frame > 0) &&
       (cpi->twopass.this_frame_stats->pcnt_inter > 0.20) &&
       ((cpi->twopass.this_frame_stats->intra_error /
         cpi->twopass.this_frame_stats->coded_error) > 2.0))) {
John Koleszar's avatar
John Koleszar committed
755
    vp8_yv12_copy_frame(lst_yv12, gld_yv12);
John Koleszar's avatar
John Koleszar committed
756 757 758
    cpi->twopass.sr_update_lag = 1;
  } else
    cpi->twopass.sr_update_lag++;
John Koleszar's avatar
John Koleszar committed
759

John Koleszar's avatar
John Koleszar committed
760
  // swap frame pointers so last frame refers to the frame we just compressed
761
  vp9_swap_yv12_buffer(lst_yv12, new_yv12);
John Koleszar's avatar
John Koleszar committed
762
  vp8_yv12_extend_frame_borders(lst_yv12);
John Koleszar's avatar
John Koleszar committed
763

John Koleszar's avatar
John Koleszar committed
764 765
  // Special case for the first frame. Copy into the GF buffer as a second reference.
  if (cm->current_video_frame == 0) {
John Koleszar's avatar
John Koleszar committed
766
    vp8_yv12_copy_frame(lst_yv12, gld_yv12);
John Koleszar's avatar
John Koleszar committed
767
  }
John Koleszar's avatar
John Koleszar committed
768 769


John Koleszar's avatar
John Koleszar committed
770 771 772 773 774
  // use this to see what the first pass reconstruction looks like
  if (0) {
    char filename[512];
    FILE *recon_file;
    sprintf(filename, "enc%04d.yuv", (int) cm->current_video_frame);
John Koleszar's avatar
John Koleszar committed
775

John Koleszar's avatar
John Koleszar committed
776 777 778 779 780
    if (cm->current_video_frame == 0)
      recon_file = fopen(filename, "wb");
    else
      recon_file = fopen(filename, "ab");

Frank Galligan's avatar
Frank Galligan committed
781
    (void)fwrite(lst_yv12->buffer_alloc, lst_yv12->frame_size, 1, recon_file);
John Koleszar's avatar
John Koleszar committed
782 783
    fclose(recon_file);
  }
John Koleszar's avatar
John Koleszar committed
784

John Koleszar's avatar
John Koleszar committed
785
  cm->current_video_frame++;
John Koleszar's avatar
John Koleszar committed
786 787 788

}

789 790 791 792 793 794
// Estimate a cost per mb attributable to overheads such as the coding of
// modes and motion vectors.
// Currently simplistic in its assumptions for testing.
//


795
static double bitcost(double prob) {
John Koleszar's avatar
John Koleszar committed
796
  return -(log(prob) / log(2.0));
797
}
798

799
static int64_t estimate_modemvcost(VP9_COMP *cpi,
John Koleszar's avatar
John Koleszar committed
800
                                     FIRSTPASS_STATS *fpstats) {
801
#if 0
John Koleszar's avatar
John Koleszar committed
802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817
  int mv_cost;
  int mode_cost;

  double av_pct_inter = fpstats->pcnt_inter / fpstats->count;
  double av_pct_motion = fpstats->pcnt_motion / fpstats->count;
  double av_intra = (1.0 - av_pct_inter);

  double zz_cost;
  double motion_cost;
  double intra_cost;

  zz_cost = bitcost(av_pct_inter - av_pct_motion);
  motion_cost = bitcost(av_pct_motion);
  intra_cost = bitcost(av_intra);

  // Estimate of extra bits per mv overhead for mbs
818
  // << 9 is the normalization to the (bits * 512) used in vp9_bits_per_mb
John Koleszar's avatar
John Koleszar committed
819 820 821
  mv_cost = ((int)(fpstats->new_mv_count / fpstats->count) * 8) << 9;

  // Crude estimate of overhead cost from modes
822
  // << 9 is the normalization to (bits * 512) used in vp9_bits_per_mb
John Koleszar's avatar
John Koleszar committed
823 824 825 826 827 828 829
  mode_cost =
    (int)((((av_pct_inter - av_pct_motion) * zz_cost) +
           (av_pct_motion * motion_cost) +
           (av_intra * intra_cost)) * cpi->common.MBs) << 9;

  // return mv_cost + mode_cost;
  // TODO PGW Fix overhead costs for extended Q range
830
#endif
John Koleszar's avatar
John Koleszar committed
831
  return 0;
832 833
}

John Koleszar's avatar
John Koleszar committed
834 835 836 837 838 839 840 841
static double calc_correction_factor(double err_per_mb,
                                     double err_divisor,
                                     double pt_low,
                                     double pt_high,
                                     int Q) {
  double power_term;
  double error_term = err_per_mb / err_divisor;
  double correction_factor;
842

John Koleszar's avatar
John Koleszar committed
843
  // Adjustment based on actual quantizer to power term.
844
  power_term = (vp9_convert_qindex_to_q(Q) * 0.01) + pt_low;
John Koleszar's avatar
John Koleszar committed
845
  power_term = (power_term > pt_high) ? pt_high : power_term;
846

John Koleszar's avatar
John Koleszar committed
847 848
  // Calculate correction factor
  correction_factor = pow(error_term, power_term);
849

John Koleszar's avatar
John Koleszar committed
850 851 852
  // Clip range
  correction_factor =
    (correction_factor < 0.05)
853
    ? 0.05 : (correction_factor > 5.0) ? 5.0 : correction_factor;
Paul Wilkins's avatar
Paul Wilkins committed
854

John Koleszar's avatar
John Koleszar committed
855
  return correction_factor;
856 857
}

Paul Wilkins's avatar
Paul Wilkins committed
858 859 860 861
// Given a current maxQ value sets a range for future values.
// PGW TODO..
// This code removes direct dependency on QIndex to determin the range
// (now uses the actual quantizer) but has not been tuned.
862
static void adjust_maxq_qrange(VP9_COMP *cpi) {
John Koleszar's avatar
John Koleszar committed
863 864 865 866 867 868 869 870
  int i;
  double q;

  // Set the max corresponding to cpi->avg_q * 2.0
  q = cpi->avg_q * 2.0;
  cpi->twopass.maxq_max_limit = cpi->worst_quality;
  for (i = cpi->best_quality; i <= cpi->worst_quality; i++) {
    cpi->twopass.maxq_max_limit = i;
871
    if (vp9_convert_qindex_to_q(i) >= q)
John Koleszar's avatar
John Koleszar committed
872 873 874 875 876 877 878 879
      break;
  }

  // Set the min corresponding to cpi->avg_q * 0.5
  q = cpi->avg_q * 0.5;
  cpi->twopass.maxq_min_limit = cpi->best_quality;
  for (i = cpi->worst_quality; i >= cpi->best_quality; i--) {
    cpi->twopass.maxq_min_limit = i;
880
    if (vp9_convert_qindex_to_q(i) <= q)
John Koleszar's avatar
John Koleszar committed
881 882
      break;
  }
Paul Wilkins's avatar
Paul Wilkins committed
883
}
Paul Wilkins's avatar
Paul Wilkins committed
884

885
static int estimate_max_q(VP9_COMP *cpi,
John Koleszar's avatar
John Koleszar committed
886
                          FIRSTPASS_STATS *fpstats,
887
                          int section_target_bandwitdh) {
John Koleszar's avatar
John Koleszar committed
888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960
  int Q;
  int num_mbs = cpi->common.MBs;
  int target_norm_bits_per_mb;

  double section_err = (fpstats->coded_error / fpstats->count);
  double sr_err_diff;
  double sr_correction;
  double err_per_mb = section_err / num_mbs;
  double err_correction_factor;
  double speed_correction = 1.0;

  if (section_target_bandwitdh <= 0)
    return cpi->twopass.maxq_max_limit;          // Highest value allowed

  target_norm_bits_per_mb =
    (section_target_bandwitdh < (1 << 20))
    ? (512 * section_target_bandwitdh) / num_mbs
    : 512 * (section_target_bandwitdh / num_mbs);

  // Look at the drop in prediction quality between the last frame
  // and the GF buffer (which contained an older frame).
  sr_err_diff =
    (fpstats->sr_coded_error - fpstats->coded_error) /
    (fpstats->count * cpi->common.MBs);
  sr_correction = (sr_err_diff / 32.0);
  sr_correction = pow(sr_correction, 0.25);
  if (sr_correction < 0.75)
    sr_correction = 0.75;
  else if (sr_correction > 1.25)
    sr_correction = 1.25;

  // Calculate a corrective factor based on a rolling ratio of bits spent
  // vs target bits
  if ((cpi->rolling_target_bits > 0) &&
      (cpi->active_worst_quality < cpi->worst_quality)) {
    double rolling_ratio;

    rolling_ratio = (double)cpi->rolling_actual_bits /
                    (double)cpi->rolling_target_bits;

    if (rolling_ratio < 0.95)
      cpi->twopass.est_max_qcorrection_factor -= 0.005;
    else if (rolling_ratio > 1.05)
      cpi->twopass.est_max_qcorrection_factor += 0.005;

    cpi->twopass.est_max_qcorrection_factor =
      (cpi->twopass.est_max_qcorrection_factor < 0.1)
      ? 0.1
      : (cpi->twopass.est_max_qcorrection_factor > 10.0)
      ? 10.0 : cpi->twopass.est_max_qcorrection_factor;
  }

  // Corrections for higher compression speed settings
  // (reduced compression expected)
  if (cpi->compressor_speed == 1) {
    if (cpi->oxcf.cpu_used <= 5)
      speed_correction = 1.04 + (cpi->oxcf.cpu_used * 0.04);
    else
      speed_correction = 1.25;
  }

  // Try and pick a max Q that will be high enough to encode the
  // content at the given rate.
  for (Q = cpi->twopass.maxq_min_limit; Q < cpi->twopass.maxq_max_limit; Q++) {
    int bits_per_mb_at_this_q;

    err_correction_factor =
      calc_correction_factor(err_per_mb, ERR_DIVISOR, 0.4, 0.90, Q) *
      sr_correction * speed_correction *
      cpi->twopass.est_max_qcorrection_factor;


    bits_per_mb_at_this_q =
961
      vp9_bits_per_mb(INTER_FRAME, Q, err_correction_factor);
John Koleszar's avatar
John Koleszar committed
962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977

    if (bits_per_mb_at_this_q <= target_norm_bits_per_mb)
      break;
  }

  // Restriction on active max q for constrained quality mode.
  if ((cpi->oxcf.end_usage == USAGE_CONSTRAINED_QUALITY) &&
      (Q < cpi->cq_target_quality)) {
    Q = cpi->cq_target_quality;
  }

  // Adjust maxq_min_limit and maxq_max_limit limits based on
  // averaga q observed in clip for non kf/gf/arf frames
  // Give average a chance to settle though.
  // PGW TODO.. This code is broken for the extended Q range
  if ((cpi->ni_frames >
978
       ((int)cpi->twopass.total_stats->count >> 8)) &&
979
      (cpi->ni_frames > 25)) {
John Koleszar's avatar
John Koleszar committed
980 981 982 983
    adjust_maxq_qrange(cpi);
  }

  return Q;
John Koleszar's avatar
John Koleszar committed
984
}
985 986 987

// For cq mode estimate a cq level that matches the observed
// complexity and data rate.
988
static int estimate_cq(VP9_COMP *cpi,
John Koleszar's avatar
John Koleszar committed
989
                       FIRSTPASS_STATS *fpstats,
990
                       int section_target_bandwitdh) {
John Koleszar's avatar
John Koleszar committed
991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046
  int Q;
  int num_mbs = cpi->common.MBs;
  int target_norm_bits_per_mb;

  double section_err = (fpstats->coded_error / fpstats->count);
  double err_per_mb = section_err / num_mbs;
  double err_correction_factor;
  double sr_err_diff;
  double sr_correction;
  double speed_correction = 1.0;
  double clip_iiratio;
  double clip_iifactor;

  target_norm_bits_per_mb = (section_target_bandwitdh < (1 << 20))
                            ? (512 * section_target_bandwitdh) / num_mbs
                            : 512 * (section_target_bandwitdh / num_mbs);


  // Corrections for higher compression speed settings
  // (reduced compression expected)
  if (cpi->compressor_speed == 1) {
    if (cpi->oxcf.cpu_used <= 5)
      speed_correction = 1.04 + (cpi->oxcf.cpu_used * 0.04);
    else
      speed_correction = 1.25;
  }

  // Look at the drop in prediction quality between the last frame
  // and the GF buffer (which contained an older frame).
  sr_err_diff =
    (fpstats->sr_coded_error - fpstats->coded_error) /
    (fpstats->count * cpi->common.MBs);
  sr_correction = (sr_err_diff / 32.0);
  sr_correction = pow(sr_correction, 0.25);
  if (sr_correction < 0.75)
    sr_correction = 0.75;
  else if (sr_correction > 1.25)
    sr_correction = 1.25;

  // II ratio correction factor for clip as a whole
  clip_iiratio = cpi->twopass.total_stats->intra_error /
                 DOUBLE_DIVIDE_CHECK(cpi->twopass.total_stats->coded_error);
  clip_iifactor = 1.0 - ((clip_iiratio - 10.0) * 0.025);
  if (clip_iifactor < 0.80)
    clip_iifactor = 0.80;

  // Try and pick a Q that can encode the content at the given rate.
  for (Q = 0; Q < MAXQ; Q++) {
    int bits_per_mb_at_this_q;

    // Error per MB based correction factor
    err_correction_factor =
      calc_correction_factor(err_per_mb, 100.0, 0.4, 0.90, Q) *
      sr_correction * speed_correction * clip_iifactor;

    bits_per_mb_at_this_q =
1047
      vp9_bits_per_mb(INTER_FRAME, Q, err_correction_factor);
1048

John Koleszar's avatar
John Koleszar committed
1049 1050 1051
    if (bits_per_mb_at_this_q <= target_norm_bits_per_mb)
      break;
  }
1052

John Koleszar's avatar
John Koleszar committed
1053 1054 1055 1056 1057 1058
  // Clip value to range "best allowed to (worst allowed - 1)"
  Q = select_cq_level(Q);
  if (Q >= cpi->worst_quality)
    Q = cpi->worst_quality - 1;
  if (Q < cpi->best_quality)
    Q = cpi->best_quality;
1059

John Koleszar's avatar
John Koleszar committed
1060
  return Q;
1061 1062
}

Paul Wilkins's avatar
CQ Mode  
Paul Wilkins committed
1063

1064
extern void vp9_new_frame_rate(VP9_COMP *cpi, double framerate);
John Koleszar's avatar
John Koleszar committed
1065

1066
void vp9_init_second_pass(VP9_COMP *cpi) {
John Koleszar's avatar
John Koleszar committed
1067 1068
  FIRSTPASS_STATS this_frame;
  FIRSTPASS_STATS *start_pos;
John Koleszar's avatar
John Koleszar committed
1069

John Koleszar's avatar
John Koleszar committed
1070 1071 1072
  double lower_bounds_min_rate = FRAME_OVERHEAD_BITS * cpi->oxcf.frame_rate;
  double two_pass_min_rate = (double)(cpi->oxcf.target_bandwidth
                                      * cpi->oxcf.two_pass_vbrmin_section / 100);
1073

John Koleszar's avatar
John Koleszar committed
1074 1075
  if (two_pass_min_rate < lower_bounds_min_rate)
    two_pass_min_rate = lower_bounds_min_rate;
John Koleszar's avatar
John Koleszar committed
1076

John Koleszar's avatar
John Koleszar committed
1077 1078
  zero_stats(cpi->twopass.total_stats);
  zero_stats(cpi->twopass.total_left_stats);
John Koleszar's avatar
John Koleszar committed
1079

John Koleszar's avatar
John Koleszar committed
1080 1081
  if (!cpi->twopass.stats_in_end)
    return;
John Koleszar's avatar
John Koleszar committed
1082

John Koleszar's avatar
John Koleszar committed
1083 1084
  *cpi->twopass.total_stats = *cpi->twopass.stats_in_end;
  *cpi->twopass.total_left_stats = *cpi->twopass.total_stats;
John Koleszar's avatar
John Koleszar committed
1085

John Koleszar's avatar
John Koleszar committed
1086 1087 1088 1089 1090
  // each frame can have a different duration, as the frame rate in the source
  // isn't guaranteed to be constant.   The frame rate prior to the first frame
  // encoded in the second pass is a guess.  However the sum duration is not.
  // Its calculated based on the actual durations of all frames from the first
  // pass.
1091 1092 1093
  vp9_new_frame_rate(cpi,
                     10000000.0 * cpi->twopass.total_stats->count /
                     cpi->twopass.total_stats->duration);