vp9_decodframe.c 36.8 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
#include <assert.h>
John Koleszar's avatar
John Koleszar committed
12

13
#include "vp9/decoder/vp9_onyxd_int.h"
Ronald S. Bultje's avatar
Ronald S. Bultje committed
14
#include "vp9/common/vp9_common.h"
15 16 17
#include "vp9/common/vp9_header.h"
#include "vp9/common/vp9_reconintra.h"
#include "vp9/common/vp9_reconinter.h"
Yaowu Xu's avatar
Yaowu Xu committed
18
#include "vp9/common/vp9_entropy.h"
19
#include "vp9/decoder/vp9_decodframe.h"
20
#include "vp9/decoder/vp9_detokenize.h"
21 22 23 24
#include "vp9/common/vp9_invtrans.h"
#include "vp9/common/vp9_alloccommon.h"
#include "vp9/common/vp9_entropymode.h"
#include "vp9/common/vp9_quant_common.h"
Johann's avatar
Johann committed
25
#include "vpx_scale/vpx_scale.h"
Scott LaVarnway's avatar
Scott LaVarnway committed
26

27
#include "vp9/decoder/vp9_decodemv.h"
28 29
#include "vp9/common/vp9_extend.h"
#include "vp9/common/vp9_modecont.h"
John Koleszar's avatar
John Koleszar committed
30
#include "vpx_mem/vpx_mem.h"
31
#include "vp9/decoder/vp9_dboolhuff.h"
John Koleszar's avatar
John Koleszar committed
32

33
#include "vp9/common/vp9_seg_common.h"
34
#include "vp9/common/vp9_tile_common.h"
35
#include "vp9_rtcd.h"
36

37
// #define DEC_DEBUG
38 39 40 41
#ifdef DEC_DEBUG
int dec_debug = 0;
#endif

42 43 44 45 46 47 48 49 50
static int read_le16(const uint8_t *p) {
  return (p[1] << 8) | p[0];
}

static int read_le32(const uint8_t *p) {
  return (p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0];
}

// len == 0 is not allowed
51 52
static int read_is_valid(const uint8_t *start, size_t len,
                         const uint8_t *end) {
53 54 55
  return start + len > start && start + len <= end;
}

56 57 58 59 60 61 62 63 64 65 66 67 68 69
static void setup_txfm_mode(VP9_COMMON *pc, int lossless, vp9_reader *r) {
  if (lossless) {
    pc->txfm_mode = ONLY_4X4;
  } else {
    pc->txfm_mode = vp9_read_literal(r, 2);
    if (pc->txfm_mode == ALLOW_32X32)
      pc->txfm_mode += vp9_read_bit(r);

    if (pc->txfm_mode == TX_MODE_SELECT) {
      pc->prob_tx[0] = vp9_read_prob(r);
      pc->prob_tx[1] = vp9_read_prob(r);
      pc->prob_tx[2] = vp9_read_prob(r);
    }
  }
70 71
}

72 73 74 75 76 77 78 79 80 81 82 83 84
static int get_unsigned_bits(unsigned int num_values) {
  int cat = 0;
  if (num_values <= 1)
    return 0;
  num_values--;
  while (num_values > 0) {
    cat++;
    num_values >>= 1;
  }
  return cat;
}

static int inv_recenter_nonneg(int v, int m) {
85
  if (v > 2 * m)
86
    return v;
87 88

  return v % 2 ? m - (v + 1) / 2 : m + v / 2;
89 90
}

91
static int decode_uniform(vp9_reader *r, int n) {
92 93 94 95 96 97
  int v;
  const int l = get_unsigned_bits(n);
  const int m = (1 << l) - n;
  if (!l)
    return 0;

98 99
  v = vp9_read_literal(r, l - 1);
  return v < m ?  v : (v << 1) - m + vp9_read_bit(r);
100 101
}

102
static int decode_term_subexp(vp9_reader *r, int k, int num_syms) {
103 104 105 106 107
  int i = 0, mk = 0, word;
  while (1) {
    const int b = i ? k + i - 1 : k;
    const int a = 1 << b;
    if (num_syms <= mk + 3 * a) {
108
      word = decode_uniform(r, num_syms - mk) + mk;
109 110
      break;
    } else {
111
      if (vp9_read_bit(r)) {
112 113 114
        i++;
        mk += a;
      } else {
115
        word = vp9_read_literal(r, b) + mk;
116 117 118 119 120 121 122
        break;
      }
    }
  }
  return word;
}

123
static int decode_unsigned_max(vp9_reader *r, int max) {
124 125 126
  int data = 0, bit = 0, lmax = max;

  while (lmax) {
127
    data |= vp9_read_bit(r) << bit++;
128 129 130 131 132
    lmax >>= 1;
  }
  return data > max ? max : data;
}

John Koleszar's avatar
John Koleszar committed
133 134
static int merge_index(int v, int n, int modulus) {
  int max1 = (n - 1 - modulus / 2) / modulus + 1;
135 136 137
  if (v < max1) {
    v = v * modulus + modulus / 2;
  } else {
John Koleszar's avatar
John Koleszar committed
138 139 140 141 142 143 144 145
    int w;
    v -= max1;
    w = v;
    v += (v + modulus - modulus / 2) / modulus;
    while (v % modulus == modulus / 2 ||
           w != v - (v + modulus - modulus / 2) / modulus) v++;
  }
  return v;
146 147
}

John Koleszar's avatar
John Koleszar committed
148 149
static int inv_remap_prob(int v, int m) {
  const int n = 256;
150

151
  v = merge_index(v, n - 1, MODULUS_PARAM);
John Koleszar's avatar
John Koleszar committed
152
  if ((m << 1) <= n) {
153
    return inv_recenter_nonneg(v + 1, m);
John Koleszar's avatar
John Koleszar committed
154
  } else {
155
    return n - 1 - inv_recenter_nonneg(v + 1, n - 1 - m);
John Koleszar's avatar
John Koleszar committed
156
  }
157
}
158

159 160
static vp9_prob read_prob_diff_update(vp9_reader *r, int oldp) {
  int delp = decode_term_subexp(r, SUBEXP_PARAM, 255);
161
  return (vp9_prob)inv_remap_prob(delp, oldp);
162
}
163

164
void vp9_init_dequantizer(VP9_COMMON *pc) {
165
  int q;
John Koleszar's avatar
John Koleszar committed
166

Dmitry Kovalev's avatar
Dmitry Kovalev committed
167
  for (q = 0; q < QINDEX_RANGE; q++) {
168
    // DC value
169 170
    pc->y_dequant[q][0] = vp9_dc_quant(q, pc->y_dc_delta_q);
    pc->uv_dequant[q][0] = vp9_dc_quant(q, pc->uv_dc_delta_q);
John Koleszar's avatar
John Koleszar committed
171

172
    // AC values
173 174
    pc->y_dequant[q][1] = vp9_ac_quant(q, 0);
    pc->uv_dequant[q][1] = vp9_ac_quant(q, pc->uv_ac_delta_q);
John Koleszar's avatar
John Koleszar committed
175
  }
John Koleszar's avatar
John Koleszar committed
176 177
}

178
static void mb_init_dequantizer(VP9_COMMON *pc, MACROBLOCKD *xd) {
John Koleszar's avatar
John Koleszar committed
179
  int i;
180
  const int segment_id = xd->mode_info_context->mbmi.segment_id;
181
  xd->q_index = vp9_get_qindex(xd, segment_id, pc->base_qindex);
John Koleszar's avatar
John Koleszar committed
182

183
  xd->plane[0].dequant = pc->y_dequant[xd->q_index];
184
  for (i = 1; i < MAX_MB_PLANE; i++)
185
    xd->plane[i].dequant = pc->uv_dequant[xd->q_index];
John Koleszar's avatar
John Koleszar committed
186 187
}

188 189
static INLINE void dequant_add_y(MACROBLOCKD *xd, TX_TYPE tx_type, int idx,
                                 BLOCK_SIZE_TYPE bsize) {
190
  struct macroblockd_plane *const y = &xd->plane[0];
191
  uint8_t* const dst = raster_block_offset_uint8(xd, bsize, 0, idx,
192 193
                                                 xd->plane[0].dst.buf,
                                                 xd->plane[0].dst.stride);
194
  if (tx_type != DCT_DCT) {
195
    vp9_iht_add_c(tx_type, BLOCK_OFFSET(y->qcoeff, idx, 16),
196
                  dst, xd->plane[0].dst.stride, y->eobs[idx]);
197
  } else {
198 199
    xd->itxm_add(BLOCK_OFFSET(y->qcoeff, idx, 16),
                 dst, xd->plane[0].dst.stride, y->eobs[idx]);
200 201 202
  }
}

203 204 205 206 207 208 209 210 211 212 213
static void decode_block(int plane, int block, BLOCK_SIZE_TYPE bsize,
                         int ss_txfrm_size, void *arg) {
  MACROBLOCKD* const xd = arg;
  int16_t* const qcoeff = BLOCK_OFFSET(xd->plane[plane].qcoeff, block, 16);
  const int stride = xd->plane[plane].dst.stride;
  const int raster_block = txfrm_block_to_raster_block(xd, bsize, plane,
                                                       block, ss_txfrm_size);
  uint8_t* const dst = raster_block_offset_uint8(xd, bsize, plane,
                                                 raster_block,
                                                 xd->plane[plane].dst.buf,
                                                 stride);
214

215
  TX_TYPE tx_type;
216

217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238
  switch (ss_txfrm_size / 2) {
    case TX_4X4:
      tx_type = plane == 0 ? get_tx_type_4x4(xd, raster_block) : DCT_DCT;
      if (tx_type == DCT_DCT)
        xd->itxm_add(qcoeff, dst, stride, xd->plane[plane].eobs[block]);
      else
        vp9_iht_add_c(tx_type, qcoeff, dst, stride,
                      xd->plane[plane].eobs[block]);
      break;
    case TX_8X8:
      tx_type = plane == 0 ? get_tx_type_8x8(xd, raster_block) : DCT_DCT;
      vp9_iht_add_8x8_c(tx_type, qcoeff, dst, stride,
                        xd->plane[plane].eobs[block]);
      break;
    case TX_16X16:
      tx_type = plane == 0 ? get_tx_type_16x16(xd, raster_block) : DCT_DCT;
      vp9_iht_add_16x16_c(tx_type, qcoeff, dst, stride,
                          xd->plane[plane].eobs[block]);
      break;
    case TX_32X32:
      vp9_idct_add_32x32(qcoeff, dst, stride, xd->plane[plane].eobs[block]);
      break;
239 240 241
  }
}

242 243 244 245 246 247 248 249 250 251
static void decode_atom_intra(VP9D_COMP *pbi, MACROBLOCKD *xd,
                              vp9_reader *r,
                              BLOCK_SIZE_TYPE bsize) {
  int i = 0;
  int bwl = b_width_log2(bsize), bhl = b_height_log2(bsize);
  int bc = 1 << (bwl + bhl);
  int tx_type;

  for (i = 0; i < bc; i++) {
    int b_mode = xd->mode_info_context->bmi[i].as_mode.first;
252 253 254 255

    uint8_t* dst = raster_block_offset_uint8(xd, bsize, 0, i,
                                             xd->plane[0].dst.buf,
                                             xd->plane[0].dst.stride);
256

257
    vp9_intra4x4_predict(xd, i, bsize, b_mode, dst, xd->plane[0].dst.stride);
258 259
    // TODO(jingning): refactor to use foreach_transformed_block_in_plane_
    tx_type = get_tx_type_4x4(xd, i);
260
    dequant_add_y(xd, tx_type, i, bsize);
261
  }
262

263 264 265
  foreach_transformed_block_uv(xd, bsize, decode_block, xd);
}

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
static void decode_atom(VP9D_COMP *pbi, MACROBLOCKD *xd,
                        int mi_row, int mi_col,
                        vp9_reader *r, BLOCK_SIZE_TYPE bsize) {
  MB_MODE_INFO *const mbmi = &xd->mode_info_context->mbmi;

  if (pbi->common.frame_type != KEY_FRAME)
    vp9_setup_interp_filters(xd, mbmi->interp_filter, &pbi->common);

  // prediction
  if (mbmi->ref_frame == INTRA_FRAME)
    vp9_build_intra_predictors_sbuv_s(xd, bsize);
  else
    vp9_build_inter_predictors_sb(xd, mi_row, mi_col, bsize);

  if (mbmi->mb_skip_coeff) {
    vp9_reset_sb_tokens_context(xd, bsize);
  } else {
    // re-initialize macroblock dequantizer before detokenization
    if (xd->segmentation_enabled)
      mb_init_dequantizer(&pbi->common, xd);

    if (!vp9_reader_has_error(r)) {
      vp9_decode_tokens(pbi, xd, r, bsize);
    }
  }

  if (mbmi->ref_frame == INTRA_FRAME)
    decode_atom_intra(pbi, xd, r, bsize);
  else
    foreach_transformed_block(xd, bsize, decode_block, xd);
}

298
static void decode_sb(VP9D_COMP *pbi, MACROBLOCKD *xd, int mi_row, int mi_col,
299
                      vp9_reader *r, BLOCK_SIZE_TYPE bsize) {
300
  const int bwl = mi_width_log2(bsize), bhl = mi_height_log2(bsize);
301
  const int bw = 1 << bwl, bh = 1 << bhl;
302
  int n, eobtotal;
303
  VP9_COMMON *const pc = &pbi->common;
304 305
  MODE_INFO *const mi = xd->mode_info_context;
  MB_MODE_INFO *const mbmi = &mi->mbmi;
306
  const int mis = pc->mode_info_stride;
307

308
  assert(mbmi->sb_type == bsize);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
309 310

  if (pbi->common.frame_type != KEY_FRAME)
311
    vp9_setup_interp_filters(xd, mbmi->interp_filter, pc);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
312

313
  // generate prediction
314
  if (mbmi->ref_frame == INTRA_FRAME) {
315 316
    vp9_build_intra_predictors_sby_s(xd, bsize);
    vp9_build_intra_predictors_sbuv_s(xd, bsize);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
317
  } else {
318
    vp9_build_inter_predictors_sb(xd, mi_row, mi_col, bsize);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
319 320
  }

321
  if (mbmi->mb_skip_coeff) {
Yunqing Wang's avatar
Yunqing Wang committed
322
    vp9_reset_sb_tokens_context(xd, bsize);
323
  } else {
Yunqing Wang's avatar
Yunqing Wang committed
324 325
    // re-initialize macroblock dequantizer before detokenization
    if (xd->segmentation_enabled)
326
      mb_init_dequantizer(pc, xd);
Yunqing Wang's avatar
Yunqing Wang committed
327 328

    // dequantization and idct
329
    eobtotal = vp9_decode_tokens(pbi, xd, r, bsize);
Yunqing Wang's avatar
Yunqing Wang committed
330 331 332 333
    if (eobtotal == 0) {  // skip loopfilter
      for (n = 0; n < bw * bh; n++) {
        const int x_idx = n & (bw - 1), y_idx = n >> bwl;

334
        if (mi_col + x_idx < pc->mi_cols && mi_row + y_idx < pc->mi_rows)
Yunqing Wang's avatar
Yunqing Wang committed
335 336 337
          mi[y_idx * mis + x_idx].mbmi.mb_skip_coeff = 1;
      }
    } else {
338
      foreach_transformed_block(xd, bsize, decode_block, xd);
339
    }
340
  }
341 342
}

343 344 345 346
static int get_delta_q(vp9_reader *r, int *dq) {
  const int old_value = *dq;

  if (vp9_read_bit(r)) {  // Update bit
347 348
    const int value = vp9_read_literal(r, 4);
    *dq = vp9_read_and_apply_sign(r, value);
John Koleszar's avatar
John Koleszar committed
349
  }
John Koleszar's avatar
John Koleszar committed
350

351
  // Trigger a quantizer update if the delta-q value has changed
352
  return old_value != *dq;
John Koleszar's avatar
John Koleszar committed
353 354
}

355
static void set_offsets(VP9D_COMP *pbi, BLOCK_SIZE_TYPE bsize,
356 357 358
                        int mi_row, int mi_col) {
  const int bh = 1 << mi_height_log2(bsize);
  const int bw = 1 << mi_width_log2(bsize);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
359 360
  VP9_COMMON *const cm = &pbi->common;
  MACROBLOCKD *const xd = &pbi->mb;
361
  const int mi_idx = mi_row * cm->mode_info_stride + mi_col;
362
  int i;
363

364
  xd->mode_info_context = cm->mi + mi_idx;
365
  xd->mode_info_context->mbmi.sb_type = bsize;
366 367
  xd->prev_mode_info_context = cm->prev_mi + mi_idx;

368 369
  for (i = 0; i < MAX_MB_PLANE; i++) {
    xd->plane[i].above_context = cm->above_context[i] +
Jingning Han's avatar
Jingning Han committed
370
        (mi_col * 2 >> xd->plane[i].subsampling_x);
371
    xd->plane[i].left_context = cm->left_context[i] +
Jingning Han's avatar
Jingning Han committed
372
        (((mi_row * 2) & 15) >> xd->plane[i].subsampling_y);
373
  }
374 375
  xd->above_seg_context = cm->above_seg_context + mi_col;
  xd->left_seg_context  = cm->left_seg_context + (mi_row & MI_MASK);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
376

377 378
  // Distance of Mb to the various image edges. These are specified to 8th pel
  // as they are always compared to values that are in 1/8th pel units
379
  set_mi_row_col(cm, xd, mi_row, bh, mi_col, bw);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
380

381
  setup_dst_planes(xd, &cm->yv12_fb[cm->new_fb_idx], mi_row, mi_col);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
382
}
John Koleszar's avatar
John Koleszar committed
383

384
static void set_refs(VP9D_COMP *pbi, int mi_row, int mi_col) {
Ronald S. Bultje's avatar
Ronald S. Bultje committed
385 386
  VP9_COMMON *const cm = &pbi->common;
  MACROBLOCKD *const xd = &pbi->mb;
387
  MB_MODE_INFO *const mbmi = &xd->mode_info_context->mbmi;
Ronald S. Bultje's avatar
Ronald S. Bultje committed
388 389

  if (mbmi->ref_frame > INTRA_FRAME) {
390
    // Select the appropriate reference frame for this MB
391 392 393
    const int fb_idx = cm->active_ref_idx[mbmi->ref_frame - 1];
    const YV12_BUFFER_CONFIG *cfg = &cm->yv12_fb[fb_idx];
    xd->scale_factor[0]    = cm->active_ref_scale[mbmi->ref_frame - 1];
394
    xd->scale_factor_uv[0] = cm->active_ref_scale[mbmi->ref_frame - 1];
395
    setup_pre_planes(xd, cfg, NULL, mi_row, mi_col,
396
                     xd->scale_factor, xd->scale_factor_uv);
397
    xd->corrupted |= cfg->corrupted;
Ronald S. Bultje's avatar
Ronald S. Bultje committed
398

Ronald S. Bultje's avatar
Ronald S. Bultje committed
399
    if (mbmi->second_ref_frame > INTRA_FRAME) {
400
      // Select the appropriate reference frame for this MB
401 402
      const int second_fb_idx = cm->active_ref_idx[mbmi->second_ref_frame - 1];
      const YV12_BUFFER_CONFIG *second_cfg = &cm->yv12_fb[second_fb_idx];
Yunqing Wang's avatar
Yunqing Wang committed
403 404
      xd->scale_factor[1]    = cm->active_ref_scale[mbmi->second_ref_frame - 1];
      xd->scale_factor_uv[1] = cm->active_ref_scale[mbmi->second_ref_frame - 1];
405
      setup_pre_planes(xd, NULL, second_cfg, mi_row, mi_col,
406
                       xd->scale_factor, xd->scale_factor_uv);
407
      xd->corrupted |= second_cfg->corrupted;
Ronald S. Bultje's avatar
Ronald S. Bultje committed
408 409 410
    }
  }
}
John Koleszar's avatar
John Koleszar committed
411

412
static void decode_modes_b(VP9D_COMP *pbi, int mi_row, int mi_col,
413 414 415
                           vp9_reader *r, BLOCK_SIZE_TYPE bsize) {
  MACROBLOCKD *const xd = &pbi->mb;

416 417 418
  set_offsets(pbi, bsize, mi_row, mi_col);
  vp9_decode_mb_mode_mv(pbi, xd, mi_row, mi_col, r);
  set_refs(pbi, mi_row, mi_col);
419

420 421 422 423
  if (bsize == BLOCK_SIZE_SB8X8 &&
      (xd->mode_info_context->mbmi.mode == SPLITMV ||
       xd->mode_info_context->mbmi.mode == I4X4_PRED))
    decode_atom(pbi, xd, mi_row, mi_col, r, bsize);
424
  else
425
    decode_sb(pbi, xd, mi_row, mi_col, r, bsize);
426

427
  xd->corrupted |= vp9_reader_has_error(r);
428 429
}

430
static void decode_modes_sb(VP9D_COMP *pbi, int mi_row, int mi_col,
431
                            vp9_reader* r, BLOCK_SIZE_TYPE bsize) {
432 433
  VP9_COMMON *const pc = &pbi->common;
  MACROBLOCKD *const xd = &pbi->mb;
434
  int bsl = mi_width_log2(bsize), bs = (1 << bsl) / 2;
435 436 437 438
  int n;
  PARTITION_TYPE partition = PARTITION_NONE;
  BLOCK_SIZE_TYPE subsize;

439
  if (mi_row >= pc->mi_rows || mi_col >= pc->mi_cols)
440 441
    return;

442
  if (bsize > BLOCK_SIZE_SB8X8) {
443
    int pl;
444
    // read the partition information
445 446
    xd->left_seg_context = pc->left_seg_context + (mi_row & MI_MASK);
    xd->above_seg_context = pc->above_seg_context + mi_col;
447
    pl = partition_plane_context(xd, bsize);
448
    partition = treed_read(r, vp9_partition_tree,
449 450
                           pc->fc.partition_prob[pl]);
    pc->fc.partition_counts[pl][partition]++;
451 452
  }

453
  subsize = get_subsize(bsize, partition);
454 455
  switch (partition) {
    case PARTITION_NONE:
456
      decode_modes_b(pbi, mi_row, mi_col, r, subsize);
457 458
      break;
    case PARTITION_HORZ:
459
      decode_modes_b(pbi, mi_row, mi_col, r, subsize);
460
      if (mi_row + bs < pc->mi_rows)
461
        decode_modes_b(pbi, mi_row + bs, mi_col, r, subsize);
462 463
      break;
    case PARTITION_VERT:
464
      decode_modes_b(pbi, mi_row, mi_col, r, subsize);
465
      if (mi_col + bs < pc->mi_cols)
466
        decode_modes_b(pbi, mi_row, mi_col + bs, r, subsize);
467 468 469 470 471 472
      break;
    case PARTITION_SPLIT:
      for (n = 0; n < 4; n++) {
        int j = n >> 1, i = n & 0x01;
        if (subsize == BLOCK_SIZE_SB32X32)
          xd->sb_index = n;
473 474 475 476
        else if (subsize == BLOCK_SIZE_MB16X16)
          xd->mb_index = n;
        else
          xd->b_index = n;
477
        decode_modes_sb(pbi, mi_row + j * bs, mi_col + i * bs, r, subsize);
478 479 480 481 482
      }
      break;
    default:
      assert(0);
  }
483
  // update partition context
484
  if ((partition == PARTITION_SPLIT) && (bsize > BLOCK_SIZE_MB16X16))
485 486
    return;

487 488
  xd->left_seg_context = pc->left_seg_context + (mi_row & MI_MASK);
  xd->above_seg_context = pc->above_seg_context + mi_col;
489
  update_partition_context(xd, subsize, bsize);
490 491
}

492
static void setup_token_decoder(VP9D_COMP *pbi,
493 494
                                const uint8_t *data,
                                vp9_reader *r) {
Dmitry Kovalev's avatar
Dmitry Kovalev committed
495
  VP9_COMMON *pc = &pbi->common;
496 497
  const uint8_t *data_end = pbi->source + pbi->source_sz;
  const size_t partition_size = data_end - data;
John Koleszar's avatar
John Koleszar committed
498

Dmitry Kovalev's avatar
Dmitry Kovalev committed
499 500 501
  // Validate the calculated partition length. If the buffer
  // described by the partition can't be fully read, then restrict
  // it to the portion that can be (for EC mode) or throw an error.
502
  if (!read_is_valid(data, partition_size, data_end))
John Koleszar's avatar
John Koleszar committed
503 504 505 506
    vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
                       "Truncated packet or corrupt partition "
                       "%d length", 1);

507
  if (vp9_reader_init(r, data, partition_size))
John Koleszar's avatar
John Koleszar committed
508 509
    vpx_internal_error(&pc->error, VPX_CODEC_MEM_ERROR,
                       "Failed to allocate bool decoder %d", 1);
John Koleszar's avatar
John Koleszar committed
510 511
}

512 513
static void init_frame(VP9D_COMP *pbi) {
  VP9_COMMON *const pc = &pbi->common;
514
  MACROBLOCKD *const xd = &pbi->mb;
John Koleszar's avatar
John Koleszar committed
515

John Koleszar's avatar
John Koleszar committed
516
  if (pc->frame_type == KEY_FRAME) {
517
    vp9_setup_past_independence(pc, xd);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
518
    // All buffers are implicitly updated on key frames.
519
    pbi->refresh_frame_flags = (1 << NUM_REF_FRAMES) - 1;
520 521 522
  } else if (pc->error_resilient_mode) {
    vp9_setup_past_independence(pc, xd);
  }
John Koleszar's avatar
John Koleszar committed
523

John Koleszar's avatar
John Koleszar committed
524
  xd->mode_info_context = pc->mi;
525
  xd->prev_mode_info_context = pc->prev_mi;
John Koleszar's avatar
John Koleszar committed
526 527 528
  xd->frame_type = pc->frame_type;
  xd->mode_info_context->mbmi.mode = DC_PRED;
  xd->mode_info_stride = pc->mode_info_stride;
John Koleszar's avatar
John Koleszar committed
529 530
}

531 532 533
static void read_coef_probs_common(vp9_coeff_probs *coef_probs,
                                   TX_SIZE tx_size,
                                   vp9_reader *r) {
534 535 536 537 538 539
#if CONFIG_MODELCOEFPROB && MODEL_BASED_UPDATE
  const int entropy_nodes_update = UNCONSTRAINED_UPDATE_NODES;
#else
  const int entropy_nodes_update = ENTROPY_NODES;
#endif

540
  int i, j, k, l, m;
John Koleszar's avatar
John Koleszar committed
541

542
  if (vp9_read_bit(r)) {
543
    for (i = 0; i < BLOCK_TYPES; i++) {
544 545 546
      for (j = 0; j < REF_TYPES; j++) {
        for (k = 0; k < COEF_BANDS; k++) {
          for (l = 0; l < PREV_COEF_CONTEXTS; l++) {
547
            const int mstart = 0;
548 549
            if (l >= 3 && k == 0)
              continue;
550 551

            for (m = mstart; m < entropy_nodes_update; m++) {
552 553
              vp9_prob *const p = coef_probs[i][j][k][l] + m;

554 555
              if (vp9_read(r, vp9_coef_update_prob[m])) {
                *p = read_prob_diff_update(r, *p);
556
#if CONFIG_MODELCOEFPROB && MODEL_BASED_UPDATE
557
                if (m == UNCONSTRAINED_NODES - 1)
558 559
                  vp9_get_model_distribution(*p, coef_probs[i][j][k][l], i, j);
#endif
560
              }
561 562 563
            }
          }
        }
564 565
      }
    }
566
  }
567
}
568

569 570 571
static void read_coef_probs(VP9D_COMP *pbi, vp9_reader *r) {
  const TXFM_MODE mode = pbi->common.txfm_mode;
  FRAME_CONTEXT *const fc = &pbi->common.fc;
Daniel Kang's avatar
Daniel Kang committed
572

573
  read_coef_probs_common(fc->coef_probs_4x4, TX_4X4, r);
574

575
  if (mode > ONLY_4X4)
576
    read_coef_probs_common(fc->coef_probs_8x8, TX_8X8, r);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
577

578
  if (mode > ALLOW_8X8)
579
    read_coef_probs_common(fc->coef_probs_16x16, TX_16X16, r);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
580

581
  if (mode > ALLOW_16X16)
582
    read_coef_probs_common(fc->coef_probs_32x32, TX_32X32, r);
583 584
}

585
static void setup_segmentation(VP9_COMMON *pc, MACROBLOCKD *xd, vp9_reader *r) {
586 587
  int i, j;

588 589
  xd->update_mb_segmentation_map = 0;
  xd->update_mb_segmentation_data = 0;
590 591 592
#if CONFIG_IMPLICIT_SEGMENTATION
  xd->allow_implicit_segment_update = 0;
#endif
593

594
  xd->segmentation_enabled = vp9_read_bit(r);
595 596 597 598 599
  if (!xd->segmentation_enabled)
    return;

  // Segmentation map update
  xd->update_mb_segmentation_map = vp9_read_bit(r);
600 601 602
#if CONFIG_IMPLICIT_SEGMENTATION
    xd->allow_implicit_segment_update = vp9_read_bit(r);
#endif
603
  if (xd->update_mb_segmentation_map) {
604
    for (i = 0; i < MB_SEG_TREE_PROBS; i++)
605 606 607 608 609 610 611 612 613 614 615
      xd->mb_segment_tree_probs[i] = vp9_read_bit(r) ? vp9_read_prob(r)
                                                     : MAX_PROB;

    pc->temporal_update = vp9_read_bit(r);
    if (pc->temporal_update) {
      for (i = 0; i < PREDICTION_PROBS; i++)
        pc->segment_pred_probs[i] = vp9_read_bit(r) ? vp9_read_prob(r)
                                                    : MAX_PROB;
    } else {
      for (i = 0; i < PREDICTION_PROBS; i++)
        pc->segment_pred_probs[i] = MAX_PROB;
616
    }
617
  }
618

619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634
  // Segmentation data update
  xd->update_mb_segmentation_data = vp9_read_bit(r);
  if (xd->update_mb_segmentation_data) {
    xd->mb_segment_abs_delta = vp9_read_bit(r);

    vp9_clearall_segfeatures(xd);

    for (i = 0; i < MAX_MB_SEGMENTS; i++) {
      for (j = 0; j < SEG_LVL_MAX; j++) {
        int data = 0;
        const int feature_enabled = vp9_read_bit(r);
        if (feature_enabled) {
          vp9_enable_segfeature(xd, i, j);
          data = decode_unsigned_max(r, vp9_seg_feature_data_max(j));
          if (vp9_is_segfeature_signed(j))
            data = vp9_read_and_apply_sign(r, data);
635
        }
636
        vp9_set_segdata(xd, i, j, data);
637 638 639 640 641
      }
    }
  }
}

642 643 644 645 646
static void setup_pred_probs(VP9_COMMON *pc, vp9_reader *r) {
  // Read common prediction model status flag probability updates for the
  // reference frame
  if (pc->frame_type == KEY_FRAME) {
    // Set the prediction probabilities to defaults
647 648 649
    pc->ref_pred_probs[0] = DEFAULT_PRED_PROB_0;
    pc->ref_pred_probs[1] = DEFAULT_PRED_PROB_1;
    pc->ref_pred_probs[2] = DEFAULT_PRED_PROB_2;
650 651 652 653 654 655 656
  } else {
    int i;
    for (i = 0; i < PREDICTION_PROBS; ++i)
      if (vp9_read_bit(r))
        pc->ref_pred_probs[i] = vp9_read_prob(r);
  }
}
657

658
static void setup_loopfilter(VP9_COMMON *pc, MACROBLOCKD *xd, vp9_reader *r) {
659 660
  pc->filter_level = vp9_read_literal(r, 6);
  pc->sharpness_level = vp9_read_literal(r, 3);
661 662

#if CONFIG_LOOP_DERING
663 664
  if (vp9_read_bit(r))
    pc->dering_enabled = 1 + vp9_read_literal(r, 4);
665 666 667 668 669 670 671 672
  else
    pc->dering_enabled = 0;
#endif

  // Read in loop filter deltas applied at the MB level based on mode or ref
  // frame.
  xd->mode_ref_lf_delta_update = 0;

673
  xd->mode_ref_lf_delta_enabled = vp9_read_bit(r);
674
  if (xd->mode_ref_lf_delta_enabled) {
675
    xd->mode_ref_lf_delta_update = vp9_read_bit(r);
676
    if (xd->mode_ref_lf_delta_update) {
677 678
      int i;

679
      for (i = 0; i < MAX_REF_LF_DELTAS; i++) {
680
        if (vp9_read_bit(r)) {
681 682
          const int value = vp9_read_literal(r, 6);
          xd->ref_lf_deltas[i] = vp9_read_and_apply_sign(r, value);
683 684 685 686
        }
      }

      for (i = 0; i < MAX_MODE_LF_DELTAS; i++) {
687
        if (vp9_read_bit(r)) {
688 689
          const int value = vp9_read_literal(r, 6);
          xd->mode_lf_deltas[i] = vp9_read_and_apply_sign(r, value);
690 691 692 693 694 695
        }
      }
    }
  }
}

696 697 698 699 700
static void setup_quantization(VP9D_COMP *pbi, vp9_reader *r) {
  // Read the default quantizers
  VP9_COMMON *const pc = &pbi->common;

  pc->base_qindex = vp9_read_literal(r, QINDEX_BITS);
701 702 703
  if (get_delta_q(r, &pc->y_dc_delta_q) |
      get_delta_q(r, &pc->uv_dc_delta_q) |
      get_delta_q(r, &pc->uv_ac_delta_q))
704
    vp9_init_dequantizer(pc);
705

706
  mb_init_dequantizer(pc, &pbi->mb);  // MB level dequantizer setup
707 708
}

709 710 711 712 713
static INTERPOLATIONFILTERTYPE read_mcomp_filter_type(vp9_reader *r) {
  return vp9_read_bit(r) ? SWITCHABLE
                         : vp9_read_literal(r, 2);
}

714 715 716 717
static const uint8_t *read_frame_size(VP9_COMMON *const pc, const uint8_t *data,
                                      const uint8_t *data_end,
                                      int *width, int *height) {
  if (data + 4 < data_end) {
718 719 720 721 722 723 724 725 726 727 728
    const int w = read_le16(data);
    const int h = read_le16(data + 2);
    if (w <= 0)
      vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
                         "Invalid frame width");

    if (h <= 0)
      vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
                         "Invalid frame height");
    *width = w;
    *height = h;
729 730 731 732 733 734 735 736
    data += 4;
  } else {
    vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
                       "Failed to read frame size");
  }
  return data;
}

737
static const uint8_t *setup_frame_size(VP9D_COMP *pbi, int scaling_active,
738 739
                                       const uint8_t *data,
                                       const uint8_t *data_end) {
740 741
  // If error concealment is enabled we should only parse the new size
  // if we have enough data. Otherwise we will end up with the wrong size.
742 743 744 745 746
  VP9_COMMON *const pc = &pbi->common;
  int display_width = pc->display_width;
  int display_height = pc->display_height;
  int width = pc->width;
  int height = pc->height;
747

748 749
  if (scaling_active)
    data = read_frame_size(pc, data, data_end, &display_width, &display_height);
750

751
  data = read_frame_size(pc, data, data_end, &width, &height);
752

753
  if (pc->width != width || pc->height != height) {
754
    if (!pbi->initial_width || !pbi->initial_height) {
755
      if (vp9_alloc_frame_buffers(pc, width, height))
756 757
        vpx_internal_error(&pc->error, VPX_CODEC_MEM_ERROR,
                           "Failed to allocate frame buffers");
758 759 760 761 762 763
        pbi->initial_width = width;
        pbi->initial_height = height;
    } else {
      if (width > pbi->initial_width)
        vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
                           "Frame width too large");
764

765 766 767
      if (height > pbi->initial_height)
        vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
                           "Frame height too large");
768 769
    }

770 771 772 773
    pc->width = width;
    pc->height = height;
    pc->display_width = scaling_active ? display_width : width;
    pc->display_height = scaling_active ? display_height : height;
774

775
    vp9_update_frame_size(pc);
776 777 778 779 780
  }

  return data;
}

781
static void update_frame_context(FRAME_CONTEXT *fc) {
782 783 784 785 786 787 788 789 790
  vp9_copy(fc->pre_coef_probs_4x4, fc->coef_probs_4x4);
  vp9_copy(fc->pre_coef_probs_8x8, fc->coef_probs_8x8);
  vp9_copy(fc->pre_coef_probs_16x16, fc->coef_probs_16x16);
  vp9_copy(fc->pre_coef_probs_32x32, fc->coef_probs_32x32);
  vp9_copy(fc->pre_ymode_prob, fc->ymode_prob);
  vp9_copy(fc->pre_sb_ymode_prob, fc->sb_ymode_prob);
  vp9_copy(fc->pre_uv_mode_prob, fc->uv_mode_prob);
  vp9_copy(fc->pre_bmode_prob, fc->bmode_prob);
  vp9_copy(fc->pre_sub_mv_ref_prob, fc->sub_mv_ref_prob);
791
  vp9_copy(fc->pre_partition_prob, fc->partition_prob);
792 793 794 795 796 797 798 799 800 801 802 803 804 805
  fc->pre_nmvc = fc->nmvc;

  vp9_zero(fc->coef_counts_4x4);
  vp9_zero(fc->coef_counts_8x8);
  vp9_zero(fc->coef_counts_16x16);
  vp9_zero(fc->coef_counts_32x32);
  vp9_zero(fc->eob_branch_counts);
  vp9_zero(fc->ymode_counts);
  vp9_zero(fc->sb_ymode_counts);
  vp9_zero(fc->uv_mode_counts);
  vp9_zero(fc->bmode_counts);
  vp9_zero(fc->sub_mv_ref_counts);
  vp9_zero(fc->NMVcount);
  vp9_zero(fc->mv_ref_ct);
806
  vp9_zero(fc->partition_counts);
807
}
808

809 810
static void decode_tile(VP9D_COMP *pbi, vp9_reader *r) {
  VP9_COMMON *const pc = &pbi->common;
811
  int mi_row, mi_col;
812

813
  for (mi_row = pc->cur_tile_mi_row_start;
Jingning Han's avatar
Jingning Han committed
814
       mi_row < pc->cur_tile_mi_row_end; mi_row += 8) {
815
    // For a SB there are 2 left contexts, each pertaining to a MB row within
816
    vpx_memset(&pc->left_context, 0, sizeof(pc->left_context));
817
    vpx_memset(pc->left_seg_context, 0, sizeof(pc->left_seg_context));
818
    for (mi_col = pc->cur_tile_mi_col_start;
819
         mi_col < pc->cur_tile_mi_col_end; mi_col += 8)
820
      decode_modes_sb(pbi, mi_row, mi_col, r, BLOCK_SIZE_SB64X64);
821 822 823
  }
}

824 825
static void decode_tiles(VP9D_COMP *pbi,
                         const uint8_t *data, int first_partition_size,
826
                         vp9_reader *header_bc, vp9_reader *residual_bc) {
827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845
  VP9_COMMON *const pc = &pbi->common;

  const uint8_t *data_ptr = data + first_partition_size;
  int tile_row, tile_col, delta_log2_tiles;

  vp9_get_tile_n_bits(pc, &pc->log2_tile_columns, &delta_log2_tiles);
  while (delta_log2_tiles--) {
    if (vp9_read_bit(header_bc)) {
      pc->log2_tile_columns++;
    } else {
      break;
    }
  }
  pc->log2_tile_rows = vp9_read_bit(header_bc);
  if (pc->log2_tile_rows)
    pc->log2_tile_rows += vp9_read_bit(header_bc);
  pc->tile_columns = 1 << pc->log2_tile_columns;
  pc->tile_rows    = 1 << pc->log2_tile_rows;

846 847
  // Note: this memset assumes above_context[0], [1] and [2]
  // are allocated as part of the same buffer.
848 849
  vpx_memset(pc->above_context[0], 0, sizeof(ENTROPY_CONTEXT) * 2 *
                                      MAX_MB_PLANE * mi_cols_aligned_to_sb(pc));
850 851

  vpx_memset(pc->above_seg_context, 0, sizeof(PARTITION_CONTEXT) *
852
                                       mi_cols_aligned_to_sb(pc));
853 854 855 856

  if (pbi->oxcf.inv_tile_order) {
    const int n_cols = pc->tile_columns;
    const uint8_t *data_ptr2[4][1 << 6];
857
    vp9_reader bc_bak = {0};
858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880

    // pre-initialize the offsets, we're going to read in inverse order
    data_ptr2[0][0] = data_ptr;
    for (tile_row = 0; tile_row < pc->tile_rows; tile_row++) {
      if (tile_row) {
        const int size = read_le32(data_ptr2[tile_row - 1][n_cols - 1]);
        data_ptr2[tile_row - 1][n_cols - 1] += 4;
        data_ptr2[tile_row][0] = data_ptr2[tile_row - 1][n_cols - 1] + size;
      }

      for (tile_col = 1; tile_col < n_cols; tile_col++) {
        const int size = read_le32(data_ptr2[tile_row][tile_col - 1]);
        data_ptr2[tile_row][tile_col - 1] += 4;
        data_ptr2[tile_row][tile_col] =
            data_ptr2[tile_row][tile_col - 1] + size;
      }
    }

    for (tile_row = 0; tile_row < pc->tile_rows; tile_row++) {
      vp9_get_tile_row_offsets(pc, tile_row);
      for (tile_col = n_cols - 1; tile_col >= 0; tile_col--) {
        vp9_get_tile_col_offsets(pc, tile_col);
        setup_token_decoder(pbi, data_ptr2[tile_row][tile_col], residual_bc);
881
        decode_tile(pbi, residual_bc);
882 883 884 885