1 /* 2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include <math.h> 12 #include "vpx_mem/vpx_mem.h" 13 14 #include "vp9/encoder/vp9_onyx_int.h" 15 #include "vp9/encoder/vp9_quantize.h" 16 #include "vp9/common/vp9_quant_common.h" 17 18 #include "vp9/common/vp9_seg_common.h" 19 20 #ifdef ENC_DEBUG 21 extern int enc_debug; 22 #endif 23 24 void vp9_quantize_b_c(int16_t *coeff_ptr, intptr_t n_coeffs, int skip_block, 25 int16_t *zbin_ptr, int16_t *round_ptr, int16_t *quant_ptr, 26 int16_t *quant_shift_ptr, int16_t *qcoeff_ptr, 27 int16_t *dqcoeff_ptr, int16_t *dequant_ptr, 28 int zbin_oq_value, uint16_t *eob_ptr, const int16_t *scan, 29 const int16_t *iscan) { 30 int i, rc, eob; 31 int zbins[2], nzbins[2], zbin; 32 int x, y, z, sz; 33 int zero_flag = n_coeffs; 34 35 vpx_memset(qcoeff_ptr, 0, n_coeffs*sizeof(int16_t)); 36 vpx_memset(dqcoeff_ptr, 0, n_coeffs*sizeof(int16_t)); 37 38 eob = -1; 39 40 // Base ZBIN 41 zbins[0] = zbin_ptr[0] + zbin_oq_value; 42 zbins[1] = zbin_ptr[1] + zbin_oq_value; 43 nzbins[0] = zbins[0] * -1; 44 nzbins[1] = zbins[1] * -1; 45 46 if (!skip_block) { 47 // Pre-scan pass 48 for (i = n_coeffs - 1; i >= 0; i--) { 49 rc = scan[i]; 50 z = coeff_ptr[rc]; 51 52 if (z < zbins[rc != 0] && z > nzbins[rc != 0]) { 53 zero_flag--; 54 } else { 55 break; 56 } 57 } 58 59 // Quantization pass: All coefficients with index >= zero_flag are 60 // skippable. Note: zero_flag can be zero. 61 for (i = 0; i < zero_flag; i++) { 62 rc = scan[i]; 63 z = coeff_ptr[rc]; 64 65 zbin = (zbins[rc != 0]); 66 67 sz = (z >> 31); // sign of z 68 x = (z ^ sz) - sz; 69 70 if (x >= zbin) { 71 x += (round_ptr[rc != 0]); 72 x = clamp(x, INT16_MIN, INT16_MAX); 73 y = (((int)(((int)(x * quant_ptr[rc != 0]) >> 16) + x)) * 74 quant_shift_ptr[rc != 0]) >> 16; // quantize (x) 75 x = (y ^ sz) - sz; // get the sign back 76 qcoeff_ptr[rc] = x; // write to destination 77 dqcoeff_ptr[rc] = x * dequant_ptr[rc != 0]; // dequantized value 78 79 if (y) { 80 eob = i; // last nonzero coeffs 81 } 82 } 83 } 84 } 85 *eob_ptr = eob + 1; 86 } 87 88 void vp9_quantize_b_32x32_c(int16_t *coeff_ptr, intptr_t n_coeffs, 89 int skip_block, 90 int16_t *zbin_ptr, int16_t *round_ptr, 91 int16_t *quant_ptr, int16_t *quant_shift_ptr, 92 int16_t *qcoeff_ptr, int16_t *dqcoeff_ptr, 93 int16_t *dequant_ptr, int zbin_oq_value, 94 uint16_t *eob_ptr, const int16_t *scan, 95 const int16_t *iscan) { 96 int i, rc, eob; 97 int zbins[2], nzbins[2]; 98 int x, y, z, sz; 99 int idx = 0; 100 int idx_arr[1024]; 101 102 vpx_memset(qcoeff_ptr, 0, n_coeffs*sizeof(int16_t)); 103 vpx_memset(dqcoeff_ptr, 0, n_coeffs*sizeof(int16_t)); 104 105 eob = -1; 106 107 // Base ZBIN 108 zbins[0] = ROUND_POWER_OF_TWO(zbin_ptr[0] + zbin_oq_value, 1); 109 zbins[1] = ROUND_POWER_OF_TWO(zbin_ptr[1] + zbin_oq_value, 1); 110 nzbins[0] = zbins[0] * -1; 111 nzbins[1] = zbins[1] * -1; 112 113 if (!skip_block) { 114 // Pre-scan pass 115 for (i = 0; i < n_coeffs; i++) { 116 rc = scan[i]; 117 z = coeff_ptr[rc]; 118 119 // If the coefficient is out of the base ZBIN range, keep it for 120 // quantization. 121 if (z >= zbins[rc != 0] || z <= nzbins[rc != 0]) 122 idx_arr[idx++] = i; 123 } 124 125 // Quantization pass: only process the coefficients selected in 126 // pre-scan pass. Note: idx can be zero. 127 for (i = 0; i < idx; i++) { 128 rc = scan[idx_arr[i]]; 129 130 z = coeff_ptr[rc]; 131 sz = (z >> 31); // sign of z 132 x = (z ^ sz) - sz; // x = abs(z) 133 134 x += ROUND_POWER_OF_TWO(round_ptr[rc != 0], 1); 135 x = clamp(x, INT16_MIN, INT16_MAX); 136 y = ((((x * quant_ptr[rc != 0]) >> 16) + x) * 137 quant_shift_ptr[rc != 0]) >> 15; // quantize (x) 138 139 x = (y ^ sz) - sz; // get the sign back 140 qcoeff_ptr[rc] = x; // write to destination 141 dqcoeff_ptr[rc] = x * dequant_ptr[rc != 0] / 2; // dequantized value 142 143 if (y) 144 eob = idx_arr[i]; // last nonzero coeffs 145 } 146 } 147 *eob_ptr = eob + 1; 148 } 149 150 struct plane_block_idx { 151 int plane; 152 int block; 153 }; 154 155 // TODO(jkoleszar): returning a struct so it can be used in a const context, 156 // expect to refactor this further later. 157 static INLINE struct plane_block_idx plane_block_idx(int y_blocks, 158 int b_idx) { 159 const int v_offset = y_blocks * 5 / 4; 160 struct plane_block_idx res; 161 162 if (b_idx < y_blocks) { 163 res.plane = 0; 164 res.block = b_idx; 165 } else if (b_idx < v_offset) { 166 res.plane = 1; 167 res.block = b_idx - y_blocks; 168 } else { 169 assert(b_idx < y_blocks * 3 / 2); 170 res.plane = 2; 171 res.block = b_idx - v_offset; 172 } 173 return res; 174 } 175 176 void vp9_regular_quantize_b_4x4(MACROBLOCK *mb, int b_idx, TX_TYPE tx_type, 177 int y_blocks) { 178 MACROBLOCKD *const xd = &mb->e_mbd; 179 const struct plane_block_idx pb_idx = plane_block_idx(y_blocks, b_idx); 180 const int16_t *scan = get_scan_4x4(tx_type); 181 const int16_t *iscan = get_iscan_4x4(tx_type); 182 183 vp9_quantize_b(BLOCK_OFFSET(mb->plane[pb_idx.plane].coeff, pb_idx.block), 184 16, mb->skip_block, 185 mb->plane[pb_idx.plane].zbin, 186 mb->plane[pb_idx.plane].round, 187 mb->plane[pb_idx.plane].quant, 188 mb->plane[pb_idx.plane].quant_shift, 189 BLOCK_OFFSET(xd->plane[pb_idx.plane].qcoeff, pb_idx.block), 190 BLOCK_OFFSET(xd->plane[pb_idx.plane].dqcoeff, pb_idx.block), 191 xd->plane[pb_idx.plane].dequant, 192 mb->plane[pb_idx.plane].zbin_extra, 193 &xd->plane[pb_idx.plane].eobs[pb_idx.block], 194 scan, iscan); 195 } 196 197 static void invert_quant(int16_t *quant, int16_t *shift, int d) { 198 unsigned t; 199 int l; 200 t = d; 201 for (l = 0; t > 1; l++) 202 t >>= 1; 203 t = 1 + (1 << (16 + l)) / d; 204 *quant = (int16_t)(t - (1 << 16)); 205 *shift = 1 << (16 - l); 206 } 207 208 void vp9_init_quantizer(VP9_COMP *cpi) { 209 int i, q; 210 VP9_COMMON *const cm = &cpi->common; 211 212 for (q = 0; q < QINDEX_RANGE; q++) { 213 const int qzbin_factor = q == 0 ? 64 : (vp9_dc_quant(q, 0) < 148 ? 84 : 80); 214 const int qrounding_factor = q == 0 ? 64 : 48; 215 216 // y 217 for (i = 0; i < 2; ++i) { 218 const int quant = i == 0 ? vp9_dc_quant(q, cm->y_dc_delta_q) 219 : vp9_ac_quant(q, 0); 220 invert_quant(&cpi->y_quant[q][i], &cpi->y_quant_shift[q][i], quant); 221 cpi->y_zbin[q][i] = ROUND_POWER_OF_TWO(qzbin_factor * quant, 7); 222 cpi->y_round[q][i] = (qrounding_factor * quant) >> 7; 223 cm->y_dequant[q][i] = quant; 224 } 225 226 // uv 227 for (i = 0; i < 2; ++i) { 228 const int quant = i == 0 ? vp9_dc_quant(q, cm->uv_dc_delta_q) 229 : vp9_ac_quant(q, cm->uv_ac_delta_q); 230 invert_quant(&cpi->uv_quant[q][i], &cpi->uv_quant_shift[q][i], quant); 231 cpi->uv_zbin[q][i] = ROUND_POWER_OF_TWO(qzbin_factor * quant, 7); 232 cpi->uv_round[q][i] = (qrounding_factor * quant) >> 7; 233 cm->uv_dequant[q][i] = quant; 234 } 235 236 #if CONFIG_ALPHA 237 // alpha 238 for (i = 0; i < 2; ++i) { 239 const int quant = i == 0 ? vp9_dc_quant(q, cm->a_dc_delta_q) 240 : vp9_ac_quant(q, cm->a_ac_delta_q); 241 invert_quant(&cpi->a_quant[q][i], &cpi->a_quant_shift[q][i], quant); 242 cpi->a_zbin[q][i] = ROUND_POWER_OF_TWO(qzbin_factor * quant, 7); 243 cpi->a_round[q][i] = (qrounding_factor * quant) >> 7; 244 cm->a_dequant[q][i] = quant; 245 } 246 #endif 247 248 for (i = 2; i < 8; i++) { 249 cpi->y_quant[q][i] = cpi->y_quant[q][1]; 250 cpi->y_quant_shift[q][i] = cpi->y_quant_shift[q][1]; 251 cpi->y_zbin[q][i] = cpi->y_zbin[q][1]; 252 cpi->y_round[q][i] = cpi->y_round[q][1]; 253 cm->y_dequant[q][i] = cm->y_dequant[q][1]; 254 255 cpi->uv_quant[q][i] = cpi->uv_quant[q][1]; 256 cpi->uv_quant_shift[q][i] = cpi->uv_quant_shift[q][1]; 257 cpi->uv_zbin[q][i] = cpi->uv_zbin[q][1]; 258 cpi->uv_round[q][i] = cpi->uv_round[q][1]; 259 cm->uv_dequant[q][i] = cm->uv_dequant[q][1]; 260 261 #if CONFIG_ALPHA 262 cpi->a_quant[q][i] = cpi->a_quant[q][1]; 263 cpi->a_quant_shift[q][i] = cpi->a_quant_shift[q][1]; 264 cpi->a_zbin[q][i] = cpi->a_zbin[q][1]; 265 cpi->a_round[q][i] = cpi->a_round[q][1]; 266 cm->a_dequant[q][i] = cm->a_dequant[q][1]; 267 #endif 268 } 269 } 270 } 271 272 void vp9_mb_init_quantizer(VP9_COMP *cpi, MACROBLOCK *x) { 273 int i; 274 MACROBLOCKD *xd = &x->e_mbd; 275 int zbin_extra; 276 int segment_id = xd->this_mi->mbmi.segment_id; 277 const int qindex = vp9_get_qindex(&cpi->common.seg, segment_id, 278 cpi->common.base_qindex); 279 280 // Y 281 zbin_extra = (cpi->common.y_dequant[qindex][1] * 282 (cpi->zbin_mode_boost + x->act_zbin_adj)) >> 7; 283 284 x->plane[0].quant = cpi->y_quant[qindex]; 285 x->plane[0].quant_shift = cpi->y_quant_shift[qindex]; 286 x->plane[0].zbin = cpi->y_zbin[qindex]; 287 x->plane[0].round = cpi->y_round[qindex]; 288 x->plane[0].zbin_extra = (int16_t)zbin_extra; 289 x->e_mbd.plane[0].dequant = cpi->common.y_dequant[qindex]; 290 291 // UV 292 zbin_extra = (cpi->common.uv_dequant[qindex][1] * 293 (cpi->zbin_mode_boost + x->act_zbin_adj)) >> 7; 294 295 for (i = 1; i < 3; i++) { 296 x->plane[i].quant = cpi->uv_quant[qindex]; 297 x->plane[i].quant_shift = cpi->uv_quant_shift[qindex]; 298 x->plane[i].zbin = cpi->uv_zbin[qindex]; 299 x->plane[i].round = cpi->uv_round[qindex]; 300 x->plane[i].zbin_extra = (int16_t)zbin_extra; 301 x->e_mbd.plane[i].dequant = cpi->common.uv_dequant[qindex]; 302 } 303 304 #if CONFIG_ALPHA 305 x->plane[3].quant = cpi->a_quant[qindex]; 306 x->plane[3].quant_shift = cpi->a_quant_shift[qindex]; 307 x->plane[3].zbin = cpi->a_zbin[qindex]; 308 x->plane[3].round = cpi->a_round[qindex]; 309 x->plane[3].zbin_extra = (int16_t)zbin_extra; 310 x->e_mbd.plane[3].dequant = cpi->common.a_dequant[qindex]; 311 #endif 312 313 x->skip_block = vp9_segfeature_active(&cpi->common.seg, segment_id, 314 SEG_LVL_SKIP); 315 316 /* save this macroblock QIndex for vp9_update_zbin_extra() */ 317 x->e_mbd.q_index = qindex; 318 } 319 320 void vp9_update_zbin_extra(VP9_COMP *cpi, MACROBLOCK *x) { 321 const int qindex = x->e_mbd.q_index; 322 const int y_zbin_extra = (cpi->common.y_dequant[qindex][1] * 323 (cpi->zbin_mode_boost + x->act_zbin_adj)) >> 7; 324 const int uv_zbin_extra = (cpi->common.uv_dequant[qindex][1] * 325 (cpi->zbin_mode_boost + x->act_zbin_adj)) >> 7; 326 327 x->plane[0].zbin_extra = (int16_t)y_zbin_extra; 328 x->plane[1].zbin_extra = (int16_t)uv_zbin_extra; 329 x->plane[2].zbin_extra = (int16_t)uv_zbin_extra; 330 } 331 332 void vp9_frame_init_quantizer(VP9_COMP *cpi) { 333 // Clear Zbin mode boost for default case 334 cpi->zbin_mode_boost = 0; 335 336 // MB level quantizer setup 337 vp9_mb_init_quantizer(cpi, &cpi->mb); 338 } 339 340 void vp9_set_quantizer(struct VP9_COMP *cpi, int Q) { 341 VP9_COMMON *cm = &cpi->common; 342 343 cm->base_qindex = Q; 344 345 // if any of the delta_q values are changing update flag will 346 // have to be set. 347 cm->y_dc_delta_q = 0; 348 cm->uv_dc_delta_q = 0; 349 cm->uv_ac_delta_q = 0; 350 351 // quantizer has to be reinitialized if any delta_q changes. 352 // As there are not any here for now this is inactive code. 353 // if(update) 354 // vp9_init_quantizer(cpi); 355 } 356
