bitstream.c 42.4 KB
Newer Older
Jingning Han's avatar
Jingning Han committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
/*
 *  Copyright (c) 2010 The WebM 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 <assert.h>
#include <stdio.h>
#include <limits.h>

#include "vpx/vpx_encoder.h"
#include "vpx_dsp/bitwriter_buffer.h"
17
#include "vpx_dsp/vpx_dsp_common.h"
Jingning Han's avatar
Jingning Han committed
18 19
#include "vpx_mem/vpx_mem.h"
#include "vpx_ports/mem_ops.h"
20
#include "vpx_ports/system_state.h"
Jingning Han's avatar
Jingning Han committed
21

22 23 24 25 26 27 28
#include "vp10/common/entropy.h"
#include "vp10/common/entropymode.h"
#include "vp10/common/entropymv.h"
#include "vp10/common/mvref_common.h"
#include "vp10/common/pred_common.h"
#include "vp10/common/seg_common.h"
#include "vp10/common/tile_common.h"
Jingning Han's avatar
Jingning Han committed
29

30 31 32 33 34 35 36
#include "vp10/encoder/cost.h"
#include "vp10/encoder/bitstream.h"
#include "vp10/encoder/encodemv.h"
#include "vp10/encoder/mcomp.h"
#include "vp10/encoder/segmentation.h"
#include "vp10/encoder/subexp.h"
#include "vp10/encoder/tokenize.h"
Jingning Han's avatar
Jingning Han committed
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79

static const struct vp10_token intra_mode_encodings[INTRA_MODES] = {
  {0, 1}, {6, 3}, {28, 5}, {30, 5}, {58, 6}, {59, 6}, {126, 7}, {127, 7},
  {62, 6}, {2, 2}};
static const struct vp10_token switchable_interp_encodings[SWITCHABLE_FILTERS] =
  {{0, 1}, {2, 2}, {3, 2}};
static const struct vp10_token partition_encodings[PARTITION_TYPES] =
  {{0, 1}, {2, 2}, {6, 3}, {7, 3}};
static const struct vp10_token inter_mode_encodings[INTER_MODES] =
  {{2, 2}, {6, 3}, {0, 1}, {7, 3}};

static void write_intra_mode(vpx_writer *w, PREDICTION_MODE mode,
                             const vpx_prob *probs) {
  vp10_write_token(w, vp10_intra_mode_tree, probs, &intra_mode_encodings[mode]);
}

static void write_inter_mode(vpx_writer *w, PREDICTION_MODE mode,
                             const vpx_prob *probs) {
  assert(is_inter_mode(mode));
  vp10_write_token(w, vp10_inter_mode_tree, probs,
                  &inter_mode_encodings[INTER_OFFSET(mode)]);
}

static void encode_unsigned_max(struct vpx_write_bit_buffer *wb,
                                int data, int max) {
  vpx_wb_write_literal(wb, data, get_unsigned_bits(max));
}

static void prob_diff_update(const vpx_tree_index *tree,
                             vpx_prob probs[/*n - 1*/],
                             const unsigned int counts[/*n - 1*/],
                             int n, vpx_writer *w) {
  int i;
  unsigned int branch_ct[32][2];

  // Assuming max number of probabilities <= 32
  assert(n <= 32);

  vp10_tree_probs_from_distribution(tree, branch_ct, counts);
  for (i = 0; i < n - 1; ++i)
    vp10_cond_prob_diff_update(w, &probs[i], branch_ct[i]);
}

Yaowu Xu's avatar
Yaowu Xu committed
80
static void write_selected_tx_size(const VP10_COMMON *cm,
Jingning Han's avatar
Jingning Han committed
81 82 83 84 85 86 87 88 89 90 91 92 93 94
                                   const MACROBLOCKD *xd, vpx_writer *w) {
  TX_SIZE tx_size = xd->mi[0]->mbmi.tx_size;
  BLOCK_SIZE bsize = xd->mi[0]->mbmi.sb_type;
  const TX_SIZE max_tx_size = max_txsize_lookup[bsize];
  const vpx_prob *const tx_probs = get_tx_probs2(max_tx_size, xd,
                                                 &cm->fc->tx_probs);
  vpx_write(w, tx_size != TX_4X4, tx_probs[0]);
  if (tx_size != TX_4X4 && max_tx_size >= TX_16X16) {
    vpx_write(w, tx_size != TX_8X8, tx_probs[1]);
    if (tx_size != TX_8X8 && max_tx_size >= TX_32X32)
      vpx_write(w, tx_size != TX_16X16, tx_probs[2]);
  }
}

Yaowu Xu's avatar
Yaowu Xu committed
95
static int write_skip(const VP10_COMMON *cm, const MACROBLOCKD *xd,
Jingning Han's avatar
Jingning Han committed
96 97 98 99 100 101 102 103 104 105
                      int segment_id, const MODE_INFO *mi, vpx_writer *w) {
  if (segfeature_active(&cm->seg, segment_id, SEG_LVL_SKIP)) {
    return 1;
  } else {
    const int skip = mi->mbmi.skip;
    vpx_write(w, skip, vp10_get_skip_prob(cm, xd));
    return skip;
  }
}

Yaowu Xu's avatar
Yaowu Xu committed
106
static void update_skip_probs(VP10_COMMON *cm, vpx_writer *w,
Jingning Han's avatar
Jingning Han committed
107 108 109 110 111 112 113
                              FRAME_COUNTS *counts) {
  int k;

  for (k = 0; k < SKIP_CONTEXTS; ++k)
    vp10_cond_prob_diff_update(w, &cm->fc->skip_probs[k], counts->skip[k]);
}

Yaowu Xu's avatar
Yaowu Xu committed
114
static void update_switchable_interp_probs(VP10_COMMON *cm, vpx_writer *w,
Jingning Han's avatar
Jingning Han committed
115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202
                                           FRAME_COUNTS *counts) {
  int j;
  for (j = 0; j < SWITCHABLE_FILTER_CONTEXTS; ++j)
    prob_diff_update(vp10_switchable_interp_tree,
                     cm->fc->switchable_interp_prob[j],
                     counts->switchable_interp[j], SWITCHABLE_FILTERS, w);
}

static void pack_mb_tokens(vpx_writer *w,
                           TOKENEXTRA **tp, const TOKENEXTRA *const stop,
                           vpx_bit_depth_t bit_depth) {
  TOKENEXTRA *p = *tp;

  while (p < stop && p->token != EOSB_TOKEN) {
    const int t = p->token;
    const struct vp10_token *const a = &vp10_coef_encodings[t];
    int i = 0;
    int v = a->value;
    int n = a->len;
#if CONFIG_VP9_HIGHBITDEPTH
    const vp10_extra_bit *b;
    if (bit_depth == VPX_BITS_12)
      b = &vp10_extra_bits_high12[t];
    else if (bit_depth == VPX_BITS_10)
      b = &vp10_extra_bits_high10[t];
    else
      b = &vp10_extra_bits[t];
#else
    const vp10_extra_bit *const b = &vp10_extra_bits[t];
    (void) bit_depth;
#endif  // CONFIG_VP9_HIGHBITDEPTH

    /* skip one or two nodes */
    if (p->skip_eob_node) {
      n -= p->skip_eob_node;
      i = 2 * p->skip_eob_node;
    }

    // TODO(jbb): expanding this can lead to big gains.  It allows
    // much better branch prediction and would enable us to avoid numerous
    // lookups and compares.

    // If we have a token that's in the constrained set, the coefficient tree
    // is split into two treed writes.  The first treed write takes care of the
    // unconstrained nodes.  The second treed write takes care of the
    // constrained nodes.
    if (t >= TWO_TOKEN && t < EOB_TOKEN) {
      int len = UNCONSTRAINED_NODES - p->skip_eob_node;
      int bits = v >> (n - len);
      vp10_write_tree(w, vp10_coef_tree, p->context_tree, bits, len, i);
      vp10_write_tree(w, vp10_coef_con_tree,
                     vp10_pareto8_full[p->context_tree[PIVOT_NODE] - 1],
                     v, n - len, 0);
    } else {
      vp10_write_tree(w, vp10_coef_tree, p->context_tree, v, n, i);
    }

    if (b->base_val) {
      const int e = p->extra, l = b->len;

      if (l) {
        const unsigned char *pb = b->prob;
        int v = e >> 1;
        int n = l;              /* number of bits in v, assumed nonzero */
        int i = 0;

        do {
          const int bb = (v >> --n) & 1;
          vpx_write(w, bb, pb[i >> 1]);
          i = b->tree[i + bb];
        } while (n);
      }

      vpx_write_bit(w, e & 1);
    }
    ++p;
  }

  *tp = p + (p->token == EOSB_TOKEN);
}

static void write_segment_id(vpx_writer *w, const struct segmentation *seg,
                             int segment_id) {
  if (seg->enabled && seg->update_map)
    vp10_write_tree(w, vp10_segment_tree, seg->tree_probs, segment_id, 3, 0);
}

// This function encodes the reference frame
Yaowu Xu's avatar
Yaowu Xu committed
203
static void write_ref_frames(const VP10_COMMON *cm, const MACROBLOCKD *xd,
Jingning Han's avatar
Jingning Han committed
204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237
                             vpx_writer *w) {
  const MB_MODE_INFO *const mbmi = &xd->mi[0]->mbmi;
  const int is_compound = has_second_ref(mbmi);
  const int segment_id = mbmi->segment_id;

  // If segment level coding of this signal is disabled...
  // or the segment allows multiple reference frame options
  if (segfeature_active(&cm->seg, segment_id, SEG_LVL_REF_FRAME)) {
    assert(!is_compound);
    assert(mbmi->ref_frame[0] ==
               get_segdata(&cm->seg, segment_id, SEG_LVL_REF_FRAME));
  } else {
    // does the feature use compound prediction or not
    // (if not specified at the frame/segment level)
    if (cm->reference_mode == REFERENCE_MODE_SELECT) {
      vpx_write(w, is_compound, vp10_get_reference_mode_prob(cm, xd));
    } else {
      assert(!is_compound == (cm->reference_mode == SINGLE_REFERENCE));
    }

    if (is_compound) {
      vpx_write(w, mbmi->ref_frame[0] == GOLDEN_FRAME,
                vp10_get_pred_prob_comp_ref_p(cm, xd));
    } else {
      const int bit0 = mbmi->ref_frame[0] != LAST_FRAME;
      vpx_write(w, bit0, vp10_get_pred_prob_single_ref_p1(cm, xd));
      if (bit0) {
        const int bit1 = mbmi->ref_frame[0] != GOLDEN_FRAME;
        vpx_write(w, bit1, vp10_get_pred_prob_single_ref_p2(cm, xd));
      }
    }
  }
}

Yaowu Xu's avatar
Yaowu Xu committed
238
static void pack_inter_mode_mvs(VP10_COMP *cpi, const MODE_INFO *mi,
Jingning Han's avatar
Jingning Han committed
239
                                vpx_writer *w) {
Yaowu Xu's avatar
Yaowu Xu committed
240
  VP10_COMMON *const cm = &cpi->common;
Jingning Han's avatar
Jingning Han committed
241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341
  const nmv_context *nmvc = &cm->fc->nmvc;
  const MACROBLOCK *const x = &cpi->td.mb;
  const MACROBLOCKD *const xd = &x->e_mbd;
  const struct segmentation *const seg = &cm->seg;
  const MB_MODE_INFO *const mbmi = &mi->mbmi;
  const MB_MODE_INFO_EXT *const mbmi_ext = x->mbmi_ext;
  const PREDICTION_MODE mode = mbmi->mode;
  const int segment_id = mbmi->segment_id;
  const BLOCK_SIZE bsize = mbmi->sb_type;
  const int allow_hp = cm->allow_high_precision_mv;
  const int is_inter = is_inter_block(mbmi);
  const int is_compound = has_second_ref(mbmi);
  int skip, ref;

  if (seg->update_map) {
    if (seg->temporal_update) {
      const int pred_flag = mbmi->seg_id_predicted;
      vpx_prob pred_prob = vp10_get_pred_prob_seg_id(seg, xd);
      vpx_write(w, pred_flag, pred_prob);
      if (!pred_flag)
        write_segment_id(w, seg, segment_id);
    } else {
      write_segment_id(w, seg, segment_id);
    }
  }

  skip = write_skip(cm, xd, segment_id, mi, w);

  if (!segfeature_active(seg, segment_id, SEG_LVL_REF_FRAME))
    vpx_write(w, is_inter, vp10_get_intra_inter_prob(cm, xd));

  if (bsize >= BLOCK_8X8 && cm->tx_mode == TX_MODE_SELECT &&
      !(is_inter && skip)) {
    write_selected_tx_size(cm, xd, w);
  }

  if (!is_inter) {
    if (bsize >= BLOCK_8X8) {
      write_intra_mode(w, mode, cm->fc->y_mode_prob[size_group_lookup[bsize]]);
    } else {
      int idx, idy;
      const int num_4x4_w = num_4x4_blocks_wide_lookup[bsize];
      const int num_4x4_h = num_4x4_blocks_high_lookup[bsize];
      for (idy = 0; idy < 2; idy += num_4x4_h) {
        for (idx = 0; idx < 2; idx += num_4x4_w) {
          const PREDICTION_MODE b_mode = mi->bmi[idy * 2 + idx].as_mode;
          write_intra_mode(w, b_mode, cm->fc->y_mode_prob[0]);
        }
      }
    }
    write_intra_mode(w, mbmi->uv_mode, cm->fc->uv_mode_prob[mode]);
  } else {
    const int mode_ctx = mbmi_ext->mode_context[mbmi->ref_frame[0]];
    const vpx_prob *const inter_probs = cm->fc->inter_mode_probs[mode_ctx];
    write_ref_frames(cm, xd, w);

    // If segment skip is not enabled code the mode.
    if (!segfeature_active(seg, segment_id, SEG_LVL_SKIP)) {
      if (bsize >= BLOCK_8X8) {
        write_inter_mode(w, mode, inter_probs);
      }
    }

    if (cm->interp_filter == SWITCHABLE) {
      const int ctx = vp10_get_pred_context_switchable_interp(xd);
      vp10_write_token(w, vp10_switchable_interp_tree,
                      cm->fc->switchable_interp_prob[ctx],
                      &switchable_interp_encodings[mbmi->interp_filter]);
      ++cpi->interp_filter_selected[0][mbmi->interp_filter];
    } else {
      assert(mbmi->interp_filter == cm->interp_filter);
    }

    if (bsize < BLOCK_8X8) {
      const int num_4x4_w = num_4x4_blocks_wide_lookup[bsize];
      const int num_4x4_h = num_4x4_blocks_high_lookup[bsize];
      int idx, idy;
      for (idy = 0; idy < 2; idy += num_4x4_h) {
        for (idx = 0; idx < 2; idx += num_4x4_w) {
          const int j = idy * 2 + idx;
          const PREDICTION_MODE b_mode = mi->bmi[j].as_mode;
          write_inter_mode(w, b_mode, inter_probs);
          if (b_mode == NEWMV) {
            for (ref = 0; ref < 1 + is_compound; ++ref)
              vp10_encode_mv(cpi, w, &mi->bmi[j].as_mv[ref].as_mv,
                            &mbmi_ext->ref_mvs[mbmi->ref_frame[ref]][0].as_mv,
                            nmvc, allow_hp);
          }
        }
      }
    } else {
      if (mode == NEWMV) {
        for (ref = 0; ref < 1 + is_compound; ++ref)
          vp10_encode_mv(cpi, w, &mbmi->mv[ref].as_mv,
                        &mbmi_ext->ref_mvs[mbmi->ref_frame[ref]][0].as_mv, nmvc,
                        allow_hp);
      }
    }
  }
}

Yaowu Xu's avatar
Yaowu Xu committed
342
static void write_mb_modes_kf(const VP10_COMMON *cm, const MACROBLOCKD *xd,
Jingning Han's avatar
Jingning Han committed
343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377
                              MODE_INFO **mi_8x8, vpx_writer *w) {
  const struct segmentation *const seg = &cm->seg;
  const MODE_INFO *const mi = mi_8x8[0];
  const MODE_INFO *const above_mi = xd->above_mi;
  const MODE_INFO *const left_mi = xd->left_mi;
  const MB_MODE_INFO *const mbmi = &mi->mbmi;
  const BLOCK_SIZE bsize = mbmi->sb_type;

  if (seg->update_map)
    write_segment_id(w, seg, mbmi->segment_id);

  write_skip(cm, xd, mbmi->segment_id, mi, w);

  if (bsize >= BLOCK_8X8 && cm->tx_mode == TX_MODE_SELECT)
    write_selected_tx_size(cm, xd, w);

  if (bsize >= BLOCK_8X8) {
    write_intra_mode(w, mbmi->mode, get_y_mode_probs(mi, above_mi, left_mi, 0));
  } else {
    const int num_4x4_w = num_4x4_blocks_wide_lookup[bsize];
    const int num_4x4_h = num_4x4_blocks_high_lookup[bsize];
    int idx, idy;

    for (idy = 0; idy < 2; idy += num_4x4_h) {
      for (idx = 0; idx < 2; idx += num_4x4_w) {
        const int block = idy * 2 + idx;
        write_intra_mode(w, mi->bmi[block].as_mode,
                         get_y_mode_probs(mi, above_mi, left_mi, block));
      }
    }
  }

  write_intra_mode(w, mbmi->uv_mode, vp10_kf_uv_mode_prob[mbmi->mode]);
}

Yaowu Xu's avatar
Yaowu Xu committed
378
static void write_modes_b(VP10_COMP *cpi, const TileInfo *const tile,
Jingning Han's avatar
Jingning Han committed
379 380 381
                          vpx_writer *w, TOKENEXTRA **tok,
                          const TOKENEXTRA *const tok_end,
                          int mi_row, int mi_col) {
Yaowu Xu's avatar
Yaowu Xu committed
382
  const VP10_COMMON *const cm = &cpi->common;
Jingning Han's avatar
Jingning Han committed
383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405
  MACROBLOCKD *const xd = &cpi->td.mb.e_mbd;
  MODE_INFO *m;

  xd->mi = cm->mi_grid_visible + (mi_row * cm->mi_stride + mi_col);
  m = xd->mi[0];

  cpi->td.mb.mbmi_ext = cpi->td.mb.mbmi_ext_base +
      (mi_row * cm->mi_cols + mi_col);

  set_mi_row_col(xd, tile,
                 mi_row, num_8x8_blocks_high_lookup[m->mbmi.sb_type],
                 mi_col, num_8x8_blocks_wide_lookup[m->mbmi.sb_type],
                 cm->mi_rows, cm->mi_cols);
  if (frame_is_intra_only(cm)) {
    write_mb_modes_kf(cm, xd, xd->mi, w);
  } else {
    pack_inter_mode_mvs(cpi, m, w);
  }

  assert(*tok < tok_end);
  pack_mb_tokens(w, tok, tok_end, cm->bit_depth);
}

Yaowu Xu's avatar
Yaowu Xu committed
406
static void write_partition(const VP10_COMMON *const cm,
Jingning Han's avatar
Jingning Han committed
407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427
                            const MACROBLOCKD *const xd,
                            int hbs, int mi_row, int mi_col,
                            PARTITION_TYPE p, BLOCK_SIZE bsize, vpx_writer *w) {
  const int ctx = partition_plane_context(xd, mi_row, mi_col, bsize);
  const vpx_prob *const probs = xd->partition_probs[ctx];
  const int has_rows = (mi_row + hbs) < cm->mi_rows;
  const int has_cols = (mi_col + hbs) < cm->mi_cols;

  if (has_rows && has_cols) {
    vp10_write_token(w, vp10_partition_tree, probs, &partition_encodings[p]);
  } else if (!has_rows && has_cols) {
    assert(p == PARTITION_SPLIT || p == PARTITION_HORZ);
    vpx_write(w, p == PARTITION_SPLIT, probs[1]);
  } else if (has_rows && !has_cols) {
    assert(p == PARTITION_SPLIT || p == PARTITION_VERT);
    vpx_write(w, p == PARTITION_SPLIT, probs[2]);
  } else {
    assert(p == PARTITION_SPLIT);
  }
}

Yaowu Xu's avatar
Yaowu Xu committed
428
static void write_modes_sb(VP10_COMP *cpi,
Jingning Han's avatar
Jingning Han committed
429 430 431
                           const TileInfo *const tile, vpx_writer *w,
                           TOKENEXTRA **tok, const TOKENEXTRA *const tok_end,
                           int mi_row, int mi_col, BLOCK_SIZE bsize) {
Yaowu Xu's avatar
Yaowu Xu committed
432
  const VP10_COMMON *const cm = &cpi->common;
Jingning Han's avatar
Jingning Han committed
433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485
  MACROBLOCKD *const xd = &cpi->td.mb.e_mbd;

  const int bsl = b_width_log2_lookup[bsize];
  const int bs = (1 << bsl) / 4;
  PARTITION_TYPE partition;
  BLOCK_SIZE subsize;
  const MODE_INFO *m = NULL;

  if (mi_row >= cm->mi_rows || mi_col >= cm->mi_cols)
    return;

  m = cm->mi_grid_visible[mi_row * cm->mi_stride + mi_col];

  partition = partition_lookup[bsl][m->mbmi.sb_type];
  write_partition(cm, xd, bs, mi_row, mi_col, partition, bsize, w);
  subsize = get_subsize(bsize, partition);
  if (subsize < BLOCK_8X8) {
    write_modes_b(cpi, tile, w, tok, tok_end, mi_row, mi_col);
  } else {
    switch (partition) {
      case PARTITION_NONE:
        write_modes_b(cpi, tile, w, tok, tok_end, mi_row, mi_col);
        break;
      case PARTITION_HORZ:
        write_modes_b(cpi, tile, w, tok, tok_end, mi_row, mi_col);
        if (mi_row + bs < cm->mi_rows)
          write_modes_b(cpi, tile, w, tok, tok_end, mi_row + bs, mi_col);
        break;
      case PARTITION_VERT:
        write_modes_b(cpi, tile, w, tok, tok_end, mi_row, mi_col);
        if (mi_col + bs < cm->mi_cols)
          write_modes_b(cpi, tile, w, tok, tok_end, mi_row, mi_col + bs);
        break;
      case PARTITION_SPLIT:
        write_modes_sb(cpi, tile, w, tok, tok_end, mi_row, mi_col, subsize);
        write_modes_sb(cpi, tile, w, tok, tok_end, mi_row, mi_col + bs,
                       subsize);
        write_modes_sb(cpi, tile, w, tok, tok_end, mi_row + bs, mi_col,
                       subsize);
        write_modes_sb(cpi, tile, w, tok, tok_end, mi_row + bs, mi_col + bs,
                       subsize);
        break;
      default:
        assert(0);
    }
  }

  // update partition context
  if (bsize >= BLOCK_8X8 &&
      (bsize == BLOCK_8X8 || partition != PARTITION_SPLIT))
    update_partition_context(xd, mi_row, mi_col, subsize, bsize);
}

Yaowu Xu's avatar
Yaowu Xu committed
486
static void write_modes(VP10_COMP *cpi,
Jingning Han's avatar
Jingning Han committed
487 488
                        const TileInfo *const tile, vpx_writer *w,
                        TOKENEXTRA **tok, const TOKENEXTRA *const tok_end) {
Yaowu Xu's avatar
Yaowu Xu committed
489
  const VP10_COMMON *const cm = &cpi->common;
Jingning Han's avatar
Jingning Han committed
490 491 492 493 494 495 496 497 498 499 500 501 502 503 504
  MACROBLOCKD *const xd = &cpi->td.mb.e_mbd;
  int mi_row, mi_col;

  set_partition_probs(cm, xd);

  for (mi_row = tile->mi_row_start; mi_row < tile->mi_row_end;
       mi_row += MI_BLOCK_SIZE) {
    vp10_zero(xd->left_seg_context);
    for (mi_col = tile->mi_col_start; mi_col < tile->mi_col_end;
         mi_col += MI_BLOCK_SIZE)
      write_modes_sb(cpi, tile, w, tok, tok_end, mi_row, mi_col,
                     BLOCK_64X64);
  }
}

Yaowu Xu's avatar
Yaowu Xu committed
505
static void build_tree_distribution(VP10_COMP *cpi, TX_SIZE tx_size,
Jingning Han's avatar
Jingning Han committed
506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531
                                    vp10_coeff_stats *coef_branch_ct,
                                    vp10_coeff_probs_model *coef_probs) {
  vp10_coeff_count *coef_counts = cpi->td.rd_counts.coef_counts[tx_size];
  unsigned int (*eob_branch_ct)[REF_TYPES][COEF_BANDS][COEFF_CONTEXTS] =
      cpi->common.counts.eob_branch[tx_size];
  int i, j, k, l, m;

  for (i = 0; i < PLANE_TYPES; ++i) {
    for (j = 0; j < REF_TYPES; ++j) {
      for (k = 0; k < COEF_BANDS; ++k) {
        for (l = 0; l < BAND_COEFF_CONTEXTS(k); ++l) {
          vp10_tree_probs_from_distribution(vp10_coef_tree,
                                           coef_branch_ct[i][j][k][l],
                                           coef_counts[i][j][k][l]);
          coef_branch_ct[i][j][k][l][0][1] = eob_branch_ct[i][j][k][l] -
                                             coef_branch_ct[i][j][k][l][0][0];
          for (m = 0; m < UNCONSTRAINED_NODES; ++m)
            coef_probs[i][j][k][l][m] = get_binary_prob(
                                            coef_branch_ct[i][j][k][l][m][0],
                                            coef_branch_ct[i][j][k][l][m][1]);
        }
      }
    }
  }
}

Yaowu Xu's avatar
Yaowu Xu committed
532
static void update_coef_probs_common(vpx_writer* const bc, VP10_COMP *cpi,
Jingning Han's avatar
Jingning Han committed
533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676
                                     TX_SIZE tx_size,
                                     vp10_coeff_stats *frame_branch_ct,
                                     vp10_coeff_probs_model *new_coef_probs) {
  vp10_coeff_probs_model *old_coef_probs = cpi->common.fc->coef_probs[tx_size];
  const vpx_prob upd = DIFF_UPDATE_PROB;
  const int entropy_nodes_update = UNCONSTRAINED_NODES;
  int i, j, k, l, t;
  int stepsize = cpi->sf.coeff_prob_appx_step;

  switch (cpi->sf.use_fast_coef_updates) {
    case TWO_LOOP: {
      /* dry run to see if there is any update at all needed */
      int savings = 0;
      int update[2] = {0, 0};
      for (i = 0; i < PLANE_TYPES; ++i) {
        for (j = 0; j < REF_TYPES; ++j) {
          for (k = 0; k < COEF_BANDS; ++k) {
            for (l = 0; l < BAND_COEFF_CONTEXTS(k); ++l) {
              for (t = 0; t < entropy_nodes_update; ++t) {
                vpx_prob newp = new_coef_probs[i][j][k][l][t];
                const vpx_prob oldp = old_coef_probs[i][j][k][l][t];
                int s;
                int u = 0;
                if (t == PIVOT_NODE)
                  s = vp10_prob_diff_update_savings_search_model(
                      frame_branch_ct[i][j][k][l][0],
                      old_coef_probs[i][j][k][l], &newp, upd, stepsize);
                else
                  s = vp10_prob_diff_update_savings_search(
                      frame_branch_ct[i][j][k][l][t], oldp, &newp, upd);
                if (s > 0 && newp != oldp)
                  u = 1;
                if (u)
                  savings += s - (int)(vp10_cost_zero(upd));
                else
                  savings -= (int)(vp10_cost_zero(upd));
                update[u]++;
              }
            }
          }
        }
      }

      // printf("Update %d %d, savings %d\n", update[0], update[1], savings);
      /* Is coef updated at all */
      if (update[1] == 0 || savings < 0) {
        vpx_write_bit(bc, 0);
        return;
      }
      vpx_write_bit(bc, 1);
      for (i = 0; i < PLANE_TYPES; ++i) {
        for (j = 0; j < REF_TYPES; ++j) {
          for (k = 0; k < COEF_BANDS; ++k) {
            for (l = 0; l < BAND_COEFF_CONTEXTS(k); ++l) {
              // calc probs and branch cts for this frame only
              for (t = 0; t < entropy_nodes_update; ++t) {
                vpx_prob newp = new_coef_probs[i][j][k][l][t];
                vpx_prob *oldp = old_coef_probs[i][j][k][l] + t;
                const vpx_prob upd = DIFF_UPDATE_PROB;
                int s;
                int u = 0;
                if (t == PIVOT_NODE)
                  s = vp10_prob_diff_update_savings_search_model(
                      frame_branch_ct[i][j][k][l][0],
                      old_coef_probs[i][j][k][l], &newp, upd, stepsize);
                else
                  s = vp10_prob_diff_update_savings_search(
                      frame_branch_ct[i][j][k][l][t],
                      *oldp, &newp, upd);
                if (s > 0 && newp != *oldp)
                  u = 1;
                vpx_write(bc, u, upd);
                if (u) {
                  /* send/use new probability */
                  vp10_write_prob_diff_update(bc, newp, *oldp);
                  *oldp = newp;
                }
              }
            }
          }
        }
      }
      return;
    }

    case ONE_LOOP_REDUCED: {
      int updates = 0;
      int noupdates_before_first = 0;
      for (i = 0; i < PLANE_TYPES; ++i) {
        for (j = 0; j < REF_TYPES; ++j) {
          for (k = 0; k < COEF_BANDS; ++k) {
            for (l = 0; l < BAND_COEFF_CONTEXTS(k); ++l) {
              // calc probs and branch cts for this frame only
              for (t = 0; t < entropy_nodes_update; ++t) {
                vpx_prob newp = new_coef_probs[i][j][k][l][t];
                vpx_prob *oldp = old_coef_probs[i][j][k][l] + t;
                int s;
                int u = 0;

                if (t == PIVOT_NODE) {
                  s = vp10_prob_diff_update_savings_search_model(
                      frame_branch_ct[i][j][k][l][0],
                      old_coef_probs[i][j][k][l], &newp, upd, stepsize);
                } else {
                  s = vp10_prob_diff_update_savings_search(
                      frame_branch_ct[i][j][k][l][t],
                      *oldp, &newp, upd);
                }

                if (s > 0 && newp != *oldp)
                  u = 1;
                updates += u;
                if (u == 0 && updates == 0) {
                  noupdates_before_first++;
                  continue;
                }
                if (u == 1 && updates == 1) {
                  int v;
                  // first update
                  vpx_write_bit(bc, 1);
                  for (v = 0; v < noupdates_before_first; ++v)
                    vpx_write(bc, 0, upd);
                }
                vpx_write(bc, u, upd);
                if (u) {
                  /* send/use new probability */
                  vp10_write_prob_diff_update(bc, newp, *oldp);
                  *oldp = newp;
                }
              }
            }
          }
        }
      }
      if (updates == 0) {
        vpx_write_bit(bc, 0);  // no updates
      }
      return;
    }
    default:
      assert(0);
  }
}

Yaowu Xu's avatar
Yaowu Xu committed
677
static void update_coef_probs(VP10_COMP *cpi, vpx_writer* w) {
Jingning Han's avatar
Jingning Han committed
678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710
  const TX_MODE tx_mode = cpi->common.tx_mode;
  const TX_SIZE max_tx_size = tx_mode_to_biggest_tx_size[tx_mode];
  TX_SIZE tx_size;
  for (tx_size = TX_4X4; tx_size <= max_tx_size; ++tx_size) {
    vp10_coeff_stats frame_branch_ct[PLANE_TYPES];
    vp10_coeff_probs_model frame_coef_probs[PLANE_TYPES];
    if (cpi->td.counts->tx.tx_totals[tx_size] <= 20 ||
        (tx_size >= TX_16X16 && cpi->sf.tx_size_search_method == USE_TX_8X8)) {
      vpx_write_bit(w, 0);
    } else {
      build_tree_distribution(cpi, tx_size, frame_branch_ct,
                              frame_coef_probs);
      update_coef_probs_common(w, cpi, tx_size, frame_branch_ct,
                               frame_coef_probs);
    }
  }
}

static void encode_loopfilter(struct loopfilter *lf,
                              struct vpx_write_bit_buffer *wb) {
  int i;

  // Encode the loop filter level and type
  vpx_wb_write_literal(wb, lf->filter_level, 6);
  vpx_wb_write_literal(wb, lf->sharpness_level, 3);

  // Write out loop filter deltas applied at the MB level based on mode or
  // ref frame (if they are enabled).
  vpx_wb_write_bit(wb, lf->mode_ref_delta_enabled);

  if (lf->mode_ref_delta_enabled) {
    vpx_wb_write_bit(wb, lf->mode_ref_delta_update);
    if (lf->mode_ref_delta_update) {
711
      for (i = 0; i < MAX_REF_FRAMES; i++) {
Jingning Han's avatar
Jingning Han committed
712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745
        const int delta = lf->ref_deltas[i];
        const int changed = delta != lf->last_ref_deltas[i];
        vpx_wb_write_bit(wb, changed);
        if (changed) {
          lf->last_ref_deltas[i] = delta;
          vpx_wb_write_literal(wb, abs(delta) & 0x3F, 6);
          vpx_wb_write_bit(wb, delta < 0);
        }
      }

      for (i = 0; i < MAX_MODE_LF_DELTAS; i++) {
        const int delta = lf->mode_deltas[i];
        const int changed = delta != lf->last_mode_deltas[i];
        vpx_wb_write_bit(wb, changed);
        if (changed) {
          lf->last_mode_deltas[i] = delta;
          vpx_wb_write_literal(wb, abs(delta) & 0x3F, 6);
          vpx_wb_write_bit(wb, delta < 0);
        }
      }
    }
  }
}

static void write_delta_q(struct vpx_write_bit_buffer *wb, int delta_q) {
  if (delta_q != 0) {
    vpx_wb_write_bit(wb, 1);
    vpx_wb_write_literal(wb, abs(delta_q), 4);
    vpx_wb_write_bit(wb, delta_q < 0);
  } else {
    vpx_wb_write_bit(wb, 0);
  }
}

Yaowu Xu's avatar
Yaowu Xu committed
746
static void encode_quantization(const VP10_COMMON *const cm,
Jingning Han's avatar
Jingning Han committed
747 748 749 750 751 752 753
                                struct vpx_write_bit_buffer *wb) {
  vpx_wb_write_literal(wb, cm->base_qindex, QINDEX_BITS);
  write_delta_q(wb, cm->y_dc_delta_q);
  write_delta_q(wb, cm->uv_dc_delta_q);
  write_delta_q(wb, cm->uv_ac_delta_q);
}

Yaowu Xu's avatar
Yaowu Xu committed
754
static void encode_segmentation(VP10_COMMON *cm, MACROBLOCKD *xd,
Jingning Han's avatar
Jingning Han committed
755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815
                                struct vpx_write_bit_buffer *wb) {
  int i, j;

  const struct segmentation *seg = &cm->seg;

  vpx_wb_write_bit(wb, seg->enabled);
  if (!seg->enabled)
    return;

  // Segmentation map
  vpx_wb_write_bit(wb, seg->update_map);
  if (seg->update_map) {
    // Select the coding strategy (temporal or spatial)
    vp10_choose_segmap_coding_method(cm, xd);
    // Write out probabilities used to decode unpredicted  macro-block segments
    for (i = 0; i < SEG_TREE_PROBS; i++) {
      const int prob = seg->tree_probs[i];
      const int update = prob != MAX_PROB;
      vpx_wb_write_bit(wb, update);
      if (update)
        vpx_wb_write_literal(wb, prob, 8);
    }

    // Write out the chosen coding method.
    vpx_wb_write_bit(wb, seg->temporal_update);
    if (seg->temporal_update) {
      for (i = 0; i < PREDICTION_PROBS; i++) {
        const int prob = seg->pred_probs[i];
        const int update = prob != MAX_PROB;
        vpx_wb_write_bit(wb, update);
        if (update)
          vpx_wb_write_literal(wb, prob, 8);
      }
    }
  }

  // Segmentation data
  vpx_wb_write_bit(wb, seg->update_data);
  if (seg->update_data) {
    vpx_wb_write_bit(wb, seg->abs_delta);

    for (i = 0; i < MAX_SEGMENTS; i++) {
      for (j = 0; j < SEG_LVL_MAX; j++) {
        const int active = segfeature_active(seg, i, j);
        vpx_wb_write_bit(wb, active);
        if (active) {
          const int data = get_segdata(seg, i, j);
          const int data_max = vp10_seg_feature_data_max(j);

          if (vp10_is_segfeature_signed(j)) {
            encode_unsigned_max(wb, abs(data), data_max);
            vpx_wb_write_bit(wb, data < 0);
          } else {
            encode_unsigned_max(wb, data, data_max);
          }
        }
      }
    }
  }
}

Yaowu Xu's avatar
Yaowu Xu committed
816
static void encode_txfm_probs(VP10_COMMON *cm, vpx_writer *w,
Jingning Han's avatar
Jingning Han committed
817 818
                              FRAME_COUNTS *counts) {
  // Mode
819
  vpx_write_literal(w, VPXMIN(cm->tx_mode, ALLOW_32X32), 2);
Jingning Han's avatar
Jingning Han committed
820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861
  if (cm->tx_mode >= ALLOW_32X32)
    vpx_write_bit(w, cm->tx_mode == TX_MODE_SELECT);

  // Probabilities
  if (cm->tx_mode == TX_MODE_SELECT) {
    int i, j;
    unsigned int ct_8x8p[TX_SIZES - 3][2];
    unsigned int ct_16x16p[TX_SIZES - 2][2];
    unsigned int ct_32x32p[TX_SIZES - 1][2];


    for (i = 0; i < TX_SIZE_CONTEXTS; i++) {
      vp10_tx_counts_to_branch_counts_8x8(counts->tx.p8x8[i], ct_8x8p);
      for (j = 0; j < TX_SIZES - 3; j++)
        vp10_cond_prob_diff_update(w, &cm->fc->tx_probs.p8x8[i][j], ct_8x8p[j]);
    }

    for (i = 0; i < TX_SIZE_CONTEXTS; i++) {
      vp10_tx_counts_to_branch_counts_16x16(counts->tx.p16x16[i], ct_16x16p);
      for (j = 0; j < TX_SIZES - 2; j++)
        vp10_cond_prob_diff_update(w, &cm->fc->tx_probs.p16x16[i][j],
                                  ct_16x16p[j]);
    }

    for (i = 0; i < TX_SIZE_CONTEXTS; i++) {
      vp10_tx_counts_to_branch_counts_32x32(counts->tx.p32x32[i], ct_32x32p);
      for (j = 0; j < TX_SIZES - 1; j++)
        vp10_cond_prob_diff_update(w, &cm->fc->tx_probs.p32x32[i][j],
                                  ct_32x32p[j]);
    }
  }
}

static void write_interp_filter(INTERP_FILTER filter,
                                struct vpx_write_bit_buffer *wb) {
  const int filter_to_literal[] = { 1, 0, 2, 3 };

  vpx_wb_write_bit(wb, filter == SWITCHABLE);
  if (filter != SWITCHABLE)
    vpx_wb_write_literal(wb, filter_to_literal[filter], 2);
}

Yaowu Xu's avatar
Yaowu Xu committed
862
static void fix_interp_filter(VP10_COMMON *cm, FRAME_COUNTS *counts) {
Jingning Han's avatar
Jingning Han committed
863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884
  if (cm->interp_filter == SWITCHABLE) {
    // Check to see if only one of the filters is actually used
    int count[SWITCHABLE_FILTERS];
    int i, j, c = 0;
    for (i = 0; i < SWITCHABLE_FILTERS; ++i) {
      count[i] = 0;
      for (j = 0; j < SWITCHABLE_FILTER_CONTEXTS; ++j)
        count[i] += counts->switchable_interp[j][i];
      c += (count[i] > 0);
    }
    if (c == 1) {
      // Only one filter is used. So set the filter at frame level
      for (i = 0; i < SWITCHABLE_FILTERS; ++i) {
        if (count[i]) {
          cm->interp_filter = i;
          break;
        }
      }
    }
  }
}

Yaowu Xu's avatar
Yaowu Xu committed
885
static void write_tile_info(const VP10_COMMON *const cm,
Jingning Han's avatar
Jingning Han committed
886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903
                            struct vpx_write_bit_buffer *wb) {
  int min_log2_tile_cols, max_log2_tile_cols, ones;
  vp10_get_tile_n_bits(cm->mi_cols, &min_log2_tile_cols, &max_log2_tile_cols);

  // columns
  ones = cm->log2_tile_cols - min_log2_tile_cols;
  while (ones--)
    vpx_wb_write_bit(wb, 1);

  if (cm->log2_tile_cols < max_log2_tile_cols)
    vpx_wb_write_bit(wb, 0);

  // rows
  vpx_wb_write_bit(wb, cm->log2_tile_rows != 0);
  if (cm->log2_tile_rows != 0)
    vpx_wb_write_bit(wb, cm->log2_tile_rows != 1);
}

Yaowu Xu's avatar
Yaowu Xu committed
904
static int get_refresh_mask(VP10_COMP *cpi) {
Jingning Han's avatar
Jingning Han committed
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
  if (vp10_preserve_existing_gf(cpi)) {
    // We have decided to preserve the previously existing golden frame as our
    // new ARF frame. However, in the short term we leave it in the GF slot and,
    // if we're updating the GF with the current decoded frame, we save it
    // instead to the ARF slot.
    // Later, in the function vp10_encoder.c:vp10_update_reference_frames() we
    // will swap gld_fb_idx and alt_fb_idx to achieve our objective. We do it
    // there so that it can be done outside of the recode loop.
    // Note: This is highly specific to the use of ARF as a forward reference,
    // and this needs to be generalized as other uses are implemented
    // (like RTC/temporal scalability).
    return (cpi->refresh_last_frame << cpi->lst_fb_idx) |
           (cpi->refresh_golden_frame << cpi->alt_fb_idx);
  } else {
    int arf_idx = cpi->alt_fb_idx;
    if ((cpi->oxcf.pass == 2) && cpi->multi_arf_allowed) {
      const GF_GROUP *const gf_group = &cpi->twopass.gf_group;
      arf_idx = gf_group->arf_update_idx[gf_group->index];
    }
    return (cpi->refresh_last_frame << cpi->lst_fb_idx) |
           (cpi->refresh_golden_frame << cpi->gld_fb_idx) |
           (cpi->refresh_alt_ref_frame << arf_idx);
  }
}

Yaowu Xu's avatar
Yaowu Xu committed
930
static size_t encode_tiles(VP10_COMP *cpi, uint8_t *data_ptr) {
Yaowu Xu's avatar
Yaowu Xu committed
931
  VP10_COMMON *const cm = &cpi->common;
Jingning Han's avatar
Jingning Han committed
932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971
  vpx_writer residual_bc;
  int tile_row, tile_col;
  TOKENEXTRA *tok_end;
  size_t total_size = 0;
  const int tile_cols = 1 << cm->log2_tile_cols;
  const int tile_rows = 1 << cm->log2_tile_rows;

  memset(cm->above_seg_context, 0,
         sizeof(*cm->above_seg_context) * mi_cols_aligned_to_sb(cm->mi_cols));

  for (tile_row = 0; tile_row < tile_rows; tile_row++) {
    for (tile_col = 0; tile_col < tile_cols; tile_col++) {
      int tile_idx = tile_row * tile_cols + tile_col;
      TOKENEXTRA *tok = cpi->tile_tok[tile_row][tile_col];

      tok_end = cpi->tile_tok[tile_row][tile_col] +
          cpi->tok_count[tile_row][tile_col];

      if (tile_col < tile_cols - 1 || tile_row < tile_rows - 1)
        vpx_start_encode(&residual_bc, data_ptr + total_size + 4);
      else
        vpx_start_encode(&residual_bc, data_ptr + total_size);

      write_modes(cpi, &cpi->tile_data[tile_idx].tile_info,
                  &residual_bc, &tok, tok_end);
      assert(tok == tok_end);
      vpx_stop_encode(&residual_bc);
      if (tile_col < tile_cols - 1 || tile_row < tile_rows - 1) {
        // size of this tile
        mem_put_be32(data_ptr + total_size, residual_bc.pos);
        total_size += 4;
      }

      total_size += residual_bc.pos;
    }
  }

  return total_size;
}

Yaowu Xu's avatar
Yaowu Xu committed
972
static void write_display_size(const VP10_COMMON *cm,
Jingning Han's avatar
Jingning Han committed
973 974 975 976 977 978 979 980 981 982
                               struct vpx_write_bit_buffer *wb) {
  const int scaling_active = cm->width != cm->display_width ||
                             cm->height != cm->display_height;
  vpx_wb_write_bit(wb, scaling_active);
  if (scaling_active) {
    vpx_wb_write_literal(wb, cm->display_width - 1, 16);
    vpx_wb_write_literal(wb, cm->display_height - 1, 16);
  }
}

Yaowu Xu's avatar
Yaowu Xu committed
983
static void write_frame_size(const VP10_COMMON *cm,
Jingning Han's avatar
Jingning Han committed
984 985 986 987 988 989 990
                             struct vpx_write_bit_buffer *wb) {
  vpx_wb_write_literal(wb, cm->width - 1, 16);
  vpx_wb_write_literal(wb, cm->height - 1, 16);

  write_display_size(cm, wb);
}

Yaowu Xu's avatar
Yaowu Xu committed
991
static void write_frame_size_with_refs(VP10_COMP *cpi,
Jingning Han's avatar
Jingning Han committed
992
                                       struct vpx_write_bit_buffer *wb) {
Yaowu Xu's avatar
Yaowu Xu committed
993
  VP10_COMMON *const cm = &cpi->common;
Jingning Han's avatar
Jingning Han committed
994 995 996 997 998 999
  int found = 0;

  MV_REFERENCE_FRAME ref_frame;
  for (ref_frame = LAST_FRAME; ref_frame <= ALTREF_FRAME; ++ref_frame) {
    YV12_BUFFER_CONFIG *cfg = get_ref_frame_buffer(cpi, ref_frame);

Yunqing Wang's avatar
Yunqing Wang committed
1000
    if (cfg != NULL) {
Jingning Han's avatar
Jingning Han committed
1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018
      found = cm->width == cfg->y_crop_width &&
              cm->height == cfg->y_crop_height;
    }
    vpx_wb_write_bit(wb, found);
    if (found) {
      break;
    }
  }

  if (!found) {
    vpx_wb_write_literal(wb, cm->width - 1, 16);
    vpx_wb_write_literal(wb, cm->height - 1, 16);
  }

  write_display_size(cm, wb);
}

static void write_sync_code(struct vpx_write_bit_buffer *wb) {
1019 1020 1021
  vpx_wb_write_literal(wb, VP10_SYNC_CODE_0, 8);
  vpx_wb_write_literal(wb, VP10_SYNC_CODE_1, 8);
  vpx_wb_write_literal(wb, VP10_SYNC_CODE_2, 8);
Jingning Han's avatar
Jingning Han committed
1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044
}

static void write_profile(BITSTREAM_PROFILE profile,
                          struct vpx_write_bit_buffer *wb) {
  switch (profile) {
    case PROFILE_0:
      vpx_wb_write_literal(wb, 0, 2);
      break;
    case PROFILE_1:
      vpx_wb_write_literal(wb, 2, 2);
      break;
    case PROFILE_2:
      vpx_wb_write_literal(wb, 1, 2);
      break;
    case PROFILE_3:
      vpx_wb_write_literal(wb, 6, 3);
      break;
    default:
      assert(0);
  }
}

static void write_bitdepth_colorspace_sampling(
Yaowu Xu's avatar
Yaowu Xu committed
1045
    VP10_COMMON *const cm, struct vpx_write_bit_buffer *wb) {
Jingning Han's avatar
Jingning Han committed
1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066
  if (cm->profile >= PROFILE_2) {
    assert(cm->bit_depth > VPX_BITS_8);
    vpx_wb_write_bit(wb, cm->bit_depth == VPX_BITS_10 ? 0 : 1);
  }
  vpx_wb_write_literal(wb, cm->color_space, 3);
  if (cm->color_space != VPX_CS_SRGB) {
    vpx_wb_write_bit(wb, 0);  // 0: [16, 235] (i.e. xvYCC), 1: [0, 255]
    if (cm->profile == PROFILE_1 || cm->profile == PROFILE_3) {
      assert(cm->subsampling_x != 1 || cm->subsampling_y != 1);
      vpx_wb_write_bit(wb, cm->subsampling_x);
      vpx_wb_write_bit(wb, cm->subsampling_y);
      vpx_wb_write_bit(wb, 0);  // unused
    } else {
      assert(cm->subsampling_x == 1 && cm->subsampling_y == 1);
    }
  } else {
    assert(cm->profile == PROFILE_1 || cm->profile == PROFILE_3);
    vpx_wb_write_bit(wb, 0);  // unused
  }
}

Yaowu Xu's avatar
Yaowu Xu committed
1067
static void write_uncompressed_header(VP10_COMP *cpi,
Jingning Han's avatar
Jingning Han committed
1068
                                      struct vpx_write_bit_buffer *wb) {
Yaowu Xu's avatar
Yaowu Xu committed
1069
  VP10_COMMON *const cm = &cpi->common;
Jingning Han's avatar
Jingning Han committed
1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134
  MACROBLOCKD *const xd = &cpi->td.mb.e_mbd;

  vpx_wb_write_literal(wb, VP9_FRAME_MARKER, 2);

  write_profile(cm->profile, wb);

  vpx_wb_write_bit(wb, 0);  // show_existing_frame
  vpx_wb_write_bit(wb, cm->frame_type);
  vpx_wb_write_bit(wb, cm->show_frame);
  vpx_wb_write_bit(wb, cm->error_resilient_mode);

  if (cm->frame_type == KEY_FRAME) {
    write_sync_code(wb);
    write_bitdepth_colorspace_sampling(cm, wb);
    write_frame_size(cm, wb);
  } else {
    if (!cm->show_frame)
      vpx_wb_write_bit(wb, cm->intra_only);

    if (!cm->error_resilient_mode)
      vpx_wb_write_literal(wb, cm->reset_frame_context, 2);

    if (cm->intra_only) {
      write_sync_code(wb);

      // Note for profile 0, 420 8bpp is assumed.
      if (cm->profile > PROFILE_0) {
        write_bitdepth_colorspace_sampling(cm, wb);
      }

      vpx_wb_write_literal(wb, get_refresh_mask(cpi), REF_FRAMES);
      write_frame_size(cm, wb);
    } else {
      MV_REFERENCE_FRAME ref_frame;
      vpx_wb_write_literal(wb, get_refresh_mask(cpi), REF_FRAMES);
      for (ref_frame = LAST_FRAME; ref_frame <= ALTREF_FRAME; ++ref_frame) {
        assert(get_ref_frame_map_idx(cpi, ref_frame) != INVALID_IDX);
        vpx_wb_write_literal(wb, get_ref_frame_map_idx(cpi, ref_frame),
                             REF_FRAMES_LOG2);
        vpx_wb_write_bit(wb, cm->ref_frame_sign_bias[ref_frame]);
      }

      write_frame_size_with_refs(cpi, wb);

      vpx_wb_write_bit(wb, cm->allow_high_precision_mv);

      fix_interp_filter(cm, cpi->td.counts);
      write_interp_filter(cm->interp_filter, wb);
    }
  }

  if (!cm->error_resilient_mode) {
    vpx_wb_write_bit(wb, cm->refresh_frame_context);
    vpx_wb_write_bit(wb, cm->frame_parallel_decoding_mode);
  }

  vpx_wb_write_literal(wb, cm->frame_context_idx, FRAME_CONTEXTS_LOG2);

  encode_loopfilter(&cm->lf, wb);
  encode_quantization(cm, wb);
  encode_segmentation(cm, xd, wb);

  write_tile_info(cm, wb);
}

Yaowu Xu's avatar
Yaowu Xu committed
1135
static size_t write_compressed_header(VP10_COMP *cpi, uint8_t *data) {
Yaowu Xu's avatar
Yaowu Xu committed
1136
  VP10_COMMON *const cm = &cpi->common;
Jingning Han's avatar
Jingning Han committed
1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211
  MACROBLOCKD *const xd = &cpi->td.mb.e_mbd;
  FRAME_CONTEXT *const fc = cm->fc;
  FRAME_COUNTS *counts = cpi->td.counts;
  vpx_writer header_bc;

  vpx_start_encode(&header_bc, data);

  if (xd->lossless)
    cm->tx_mode = ONLY_4X4;
  else
    encode_txfm_probs(cm, &header_bc, counts);

  update_coef_probs(cpi, &header_bc);
  update_skip_probs(cm, &header_bc, counts);

  if (!frame_is_intra_only(cm)) {
    int i;

    for (i = 0; i < INTER_MODE_CONTEXTS; ++i)
      prob_diff_update(vp10_inter_mode_tree, cm->fc->inter_mode_probs[i],
                       counts->inter_mode[i], INTER_MODES, &header_bc);

    if (cm->interp_filter == SWITCHABLE)
      update_switchable_interp_probs(cm, &header_bc, counts);

    for (i = 0; i < INTRA_INTER_CONTEXTS; i++)
      vp10_cond_prob_diff_update(&header_bc, &fc->intra_inter_prob[i],
                                counts->intra_inter[i]);

    if (cpi->allow_comp_inter_inter) {
      const int use_compound_pred = cm->reference_mode != SINGLE_REFERENCE;
      const int use_hybrid_pred = cm->reference_mode == REFERENCE_MODE_SELECT;

      vpx_write_bit(&header_bc, use_compound_pred);
      if (use_compound_pred) {
        vpx_write_bit(&header_bc, use_hybrid_pred);
        if (use_hybrid_pred)
          for (i = 0; i < COMP_INTER_CONTEXTS; i++)
            vp10_cond_prob_diff_update(&header_bc, &fc->comp_inter_prob[i],
                                      counts->comp_inter[i]);
      }
    }

    if (cm->reference_mode != COMPOUND_REFERENCE) {
      for (i = 0; i < REF_CONTEXTS; i++) {
        vp10_cond_prob_diff_update(&header_bc, &fc->single_ref_prob[i][0],
                                  counts->single_ref[i][0]);
        vp10_cond_prob_diff_update(&header_bc, &fc->single_ref_prob[i][1],
                                  counts->single_ref[i][1]);
      }
    }

    if (cm->reference_mode != SINGLE_REFERENCE)
      for (i = 0; i < REF_CONTEXTS; i++)
        vp10_cond_prob_diff_update(&header_bc, &fc->comp_ref_prob[i],
                                  counts->comp_ref[i]);

    for (i = 0; i < BLOCK_SIZE_GROUPS; ++i)
      prob_diff_update(vp10_intra_mode_tree, cm->fc->y_mode_prob[i],
                       counts->y_mode[i], INTRA_MODES, &header_bc);

    for (i = 0; i < PARTITION_CONTEXTS; ++i)
      prob_diff_update(vp10_partition_tree, fc->partition_prob[i],
                       counts->partition[i], PARTITION_TYPES, &header_bc);

    vp10_write_nmv_probs(cm, cm->allow_high_precision_mv, &header_bc,
                        &counts->mv);
  }

  vpx_stop_encode(&header_bc);
  assert(header_bc.pos <= 0xffff);

  return header_bc.pos;
}

Yaowu Xu's avatar
Yaowu Xu committed
1212
void vp10_pack_bitstream(VP10_COMP *cpi, uint8_t *dest, size_t *size) {
Jingning Han's avatar
Jingning Han committed
1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235
  uint8_t *data = dest;
  size_t first_part_size, uncompressed_hdr_size;
  struct vpx_write_bit_buffer wb = {data, 0};
  struct vpx_write_bit_buffer saved_wb;

  write_uncompressed_header(cpi, &wb);
  saved_wb = wb;
  vpx_wb_write_literal(&wb, 0, 16);  // don't know in advance first part. size

  uncompressed_hdr_size = vpx_wb_bytes_written(&wb);
  data += uncompressed_hdr_size;

  vpx_clear_system_state();

  first_part_size = write_compressed_header(cpi, data);
  data += first_part_size;
  // TODO(jbb): Figure out what to do if first_part_size > 16 bits.
  vpx_wb_write_literal(&saved_wb, (int)first_part_size, 16);

  data += encode_tiles(cpi, data);

  *size = data - dest;
}