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 13 #include "vpx_mem/vpx_mem.h" 14 15 #include "vp9/common/vp9_quant_common.h" 16 #include "vp9/common/vp9_seg_common.h" 17 18 #include "vp9/encoder/vp9_onyx_int.h" 19 #include "vp9/encoder/vp9_quantize.h" 20 #include "vp9/encoder/vp9_rdopt.h" 21 22 void vp9_quantize_b_c(const int16_t *coeff_ptr, intptr_t count, 23 int skip_block, 24 const int16_t *zbin_ptr, const int16_t *round_ptr, 25 const int16_t *quant_ptr, const int16_t *quant_shift_ptr, 26 int16_t *qcoeff_ptr, int16_t *dqcoeff_ptr, 27 const int16_t *dequant_ptr, 28 int zbin_oq_value, uint16_t *eob_ptr, 29 const int16_t *scan, const int16_t *iscan) { 30 int i, non_zero_count = (int)count, eob = -1; 31 const int zbins[2] = { zbin_ptr[0] + zbin_oq_value, 32 zbin_ptr[1] + zbin_oq_value }; 33 const int nzbins[2] = { zbins[0] * -1, 34 zbins[1] * -1 }; 35 36 vpx_memset(qcoeff_ptr, 0, count * sizeof(int16_t)); 37 vpx_memset(dqcoeff_ptr, 0, count * sizeof(int16_t)); 38 39 if (!skip_block) { 40 // Pre-scan pass 41 for (i = (int)count - 1; i >= 0; i--) { 42 const int rc = scan[i]; 43 const int coeff = coeff_ptr[rc]; 44 45 if (coeff < zbins[rc != 0] && coeff > nzbins[rc != 0]) 46 non_zero_count--; 47 else 48 break; 49 } 50 51 // Quantization pass: All coefficients with index >= zero_flag are 52 // skippable. Note: zero_flag can be zero. 53 for (i = 0; i < non_zero_count; i++) { 54 const int rc = scan[i]; 55 const int coeff = coeff_ptr[rc]; 56 const int coeff_sign = (coeff >> 31); 57 const int abs_coeff = (coeff ^ coeff_sign) - coeff_sign; 58 59 if (abs_coeff >= zbins[rc != 0]) { 60 int tmp = clamp(abs_coeff + round_ptr[rc != 0], INT16_MIN, INT16_MAX); 61 tmp = ((((tmp * quant_ptr[rc != 0]) >> 16) + tmp) * 62 quant_shift_ptr[rc != 0]) >> 16; // quantization 63 qcoeff_ptr[rc] = (tmp ^ coeff_sign) - coeff_sign; 64 dqcoeff_ptr[rc] = qcoeff_ptr[rc] * dequant_ptr[rc != 0]; 65 66 if (tmp) 67 eob = i; 68 } 69 } 70 } 71 *eob_ptr = eob + 1; 72 } 73 74 void vp9_quantize_b_32x32_c(const int16_t *coeff_ptr, intptr_t n_coeffs, 75 int skip_block, 76 const int16_t *zbin_ptr, const int16_t *round_ptr, 77 const int16_t *quant_ptr, 78 const int16_t *quant_shift_ptr, 79 int16_t *qcoeff_ptr, int16_t *dqcoeff_ptr, 80 const int16_t *dequant_ptr, 81 int zbin_oq_value, uint16_t *eob_ptr, 82 const int16_t *scan, const int16_t *iscan) { 83 const int zbins[2] = { ROUND_POWER_OF_TWO(zbin_ptr[0] + zbin_oq_value, 1), 84 ROUND_POWER_OF_TWO(zbin_ptr[1] + zbin_oq_value, 1) }; 85 const int nzbins[2] = {zbins[0] * -1, zbins[1] * -1}; 86 87 int idx = 0; 88 int idx_arr[1024]; 89 int i, eob = -1; 90 91 vpx_memset(qcoeff_ptr, 0, n_coeffs * sizeof(int16_t)); 92 vpx_memset(dqcoeff_ptr, 0, n_coeffs * sizeof(int16_t)); 93 94 if (!skip_block) { 95 // Pre-scan pass 96 for (i = 0; i < n_coeffs; i++) { 97 const int rc = scan[i]; 98 const int coeff = coeff_ptr[rc]; 99 100 // If the coefficient is out of the base ZBIN range, keep it for 101 // quantization. 102 if (coeff >= zbins[rc != 0] || coeff <= nzbins[rc != 0]) 103 idx_arr[idx++] = i; 104 } 105 106 // Quantization pass: only process the coefficients selected in 107 // pre-scan pass. Note: idx can be zero. 108 for (i = 0; i < idx; i++) { 109 const int rc = scan[idx_arr[i]]; 110 const int coeff = coeff_ptr[rc]; 111 const int coeff_sign = (coeff >> 31); 112 int tmp; 113 int abs_coeff = (coeff ^ coeff_sign) - coeff_sign; 114 abs_coeff += ROUND_POWER_OF_TWO(round_ptr[rc != 0], 1); 115 abs_coeff = clamp(abs_coeff, INT16_MIN, INT16_MAX); 116 tmp = ((((abs_coeff * quant_ptr[rc != 0]) >> 16) + abs_coeff) * 117 quant_shift_ptr[rc != 0]) >> 15; 118 119 qcoeff_ptr[rc] = (tmp ^ coeff_sign) - coeff_sign; 120 dqcoeff_ptr[rc] = qcoeff_ptr[rc] * dequant_ptr[rc != 0] / 2; 121 122 if (tmp) 123 eob = idx_arr[i]; 124 } 125 } 126 *eob_ptr = eob + 1; 127 } 128 129 void vp9_regular_quantize_b_4x4(MACROBLOCK *x, int plane, int block, 130 const int16_t *scan, const int16_t *iscan) { 131 MACROBLOCKD *const xd = &x->e_mbd; 132 struct macroblock_plane *p = &x->plane[plane]; 133 struct macroblockd_plane *pd = &xd->plane[plane]; 134 135 vp9_quantize_b(BLOCK_OFFSET(p->coeff, block), 136 16, x->skip_block, 137 p->zbin, p->round, p->quant, p->quant_shift, 138 BLOCK_OFFSET(p->qcoeff, block), 139 BLOCK_OFFSET(pd->dqcoeff, block), 140 pd->dequant, p->zbin_extra, &p->eobs[block], scan, iscan); 141 } 142 143 static void invert_quant(int16_t *quant, int16_t *shift, int d) { 144 unsigned t; 145 int l; 146 t = d; 147 for (l = 0; t > 1; l++) 148 t >>= 1; 149 t = 1 + (1 << (16 + l)) / d; 150 *quant = (int16_t)(t - (1 << 16)); 151 *shift = 1 << (16 - l); 152 } 153 154 void vp9_init_quantizer(VP9_COMP *cpi) { 155 VP9_COMMON *const cm = &cpi->common; 156 QUANTS *const quants = &cpi->quants; 157 int i, q, quant; 158 159 for (q = 0; q < QINDEX_RANGE; q++) { 160 const int qzbin_factor = q == 0 ? 64 : (vp9_dc_quant(q, 0) < 148 ? 84 : 80); 161 const int qrounding_factor = q == 0 ? 64 : 48; 162 163 for (i = 0; i < 2; ++i) { 164 // y 165 quant = i == 0 ? vp9_dc_quant(q, cm->y_dc_delta_q) 166 : vp9_ac_quant(q, 0); 167 invert_quant(&quants->y_quant[q][i], &quants->y_quant_shift[q][i], quant); 168 quants->y_zbin[q][i] = ROUND_POWER_OF_TWO(qzbin_factor * quant, 7); 169 quants->y_round[q][i] = (qrounding_factor * quant) >> 7; 170 cm->y_dequant[q][i] = quant; 171 172 // uv 173 quant = i == 0 ? vp9_dc_quant(q, cm->uv_dc_delta_q) 174 : vp9_ac_quant(q, cm->uv_ac_delta_q); 175 invert_quant(&quants->uv_quant[q][i], 176 &quants->uv_quant_shift[q][i], quant); 177 quants->uv_zbin[q][i] = ROUND_POWER_OF_TWO(qzbin_factor * quant, 7); 178 quants->uv_round[q][i] = (qrounding_factor * quant) >> 7; 179 cm->uv_dequant[q][i] = quant; 180 181 #if CONFIG_ALPHA 182 // alpha 183 quant = i == 0 ? vp9_dc_quant(q, cm->a_dc_delta_q) 184 : vp9_ac_quant(q, cm->a_ac_delta_q); 185 invert_quant(&quants->a_quant[q][i], &quants->a_quant_shift[q][i], quant); 186 quants->a_zbin[q][i] = ROUND_POWER_OF_TWO(qzbin_factor * quant, 7); 187 quants->a_round[q][i] = (qrounding_factor * quant) >> 7; 188 cm->a_dequant[q][i] = quant; 189 #endif 190 } 191 192 for (i = 2; i < 8; i++) { 193 quants->y_quant[q][i] = quants->y_quant[q][1]; 194 quants->y_quant_shift[q][i] = quants->y_quant_shift[q][1]; 195 quants->y_zbin[q][i] = quants->y_zbin[q][1]; 196 quants->y_round[q][i] = quants->y_round[q][1]; 197 cm->y_dequant[q][i] = cm->y_dequant[q][1]; 198 199 quants->uv_quant[q][i] = quants->uv_quant[q][1]; 200 quants->uv_quant_shift[q][i] = quants->uv_quant_shift[q][1]; 201 quants->uv_zbin[q][i] = quants->uv_zbin[q][1]; 202 quants->uv_round[q][i] = quants->uv_round[q][1]; 203 cm->uv_dequant[q][i] = cm->uv_dequant[q][1]; 204 205 #if CONFIG_ALPHA 206 quants->a_quant[q][i] = quants->a_quant[q][1]; 207 quants->a_quant_shift[q][i] = quants->a_quant_shift[q][1]; 208 quants->a_zbin[q][i] = quants->a_zbin[q][1]; 209 quants->a_round[q][i] = quants->a_round[q][1]; 210 cm->a_dequant[q][i] = cm->a_dequant[q][1]; 211 #endif 212 } 213 } 214 } 215 216 void vp9_init_plane_quantizers(VP9_COMP *cpi, MACROBLOCK *x) { 217 const VP9_COMMON *const cm = &cpi->common; 218 MACROBLOCKD *const xd = &x->e_mbd; 219 QUANTS *const quants = &cpi->quants; 220 const int segment_id = xd->mi[0]->mbmi.segment_id; 221 const int qindex = vp9_get_qindex(&cm->seg, segment_id, cm->base_qindex); 222 const int rdmult = vp9_compute_rd_mult(cpi, qindex + cm->y_dc_delta_q); 223 const int zbin = cpi->zbin_mode_boost + x->act_zbin_adj; 224 int i; 225 226 // Y 227 x->plane[0].quant = quants->y_quant[qindex]; 228 x->plane[0].quant_shift = quants->y_quant_shift[qindex]; 229 x->plane[0].zbin = quants->y_zbin[qindex]; 230 x->plane[0].round = quants->y_round[qindex]; 231 x->plane[0].zbin_extra = (int16_t)((cm->y_dequant[qindex][1] * zbin) >> 7); 232 xd->plane[0].dequant = cm->y_dequant[qindex]; 233 234 // UV 235 for (i = 1; i < 3; i++) { 236 x->plane[i].quant = quants->uv_quant[qindex]; 237 x->plane[i].quant_shift = quants->uv_quant_shift[qindex]; 238 x->plane[i].zbin = quants->uv_zbin[qindex]; 239 x->plane[i].round = quants->uv_round[qindex]; 240 x->plane[i].zbin_extra = (int16_t)((cm->uv_dequant[qindex][1] * zbin) >> 7); 241 xd->plane[i].dequant = cm->uv_dequant[qindex]; 242 } 243 244 #if CONFIG_ALPHA 245 x->plane[3].quant = cpi->a_quant[qindex]; 246 x->plane[3].quant_shift = cpi->a_quant_shift[qindex]; 247 x->plane[3].zbin = cpi->a_zbin[qindex]; 248 x->plane[3].round = cpi->a_round[qindex]; 249 x->plane[3].zbin_extra = (int16_t)((cm->a_dequant[qindex][1] * zbin) >> 7); 250 xd->plane[3].dequant = cm->a_dequant[qindex]; 251 #endif 252 253 x->skip_block = vp9_segfeature_active(&cm->seg, segment_id, SEG_LVL_SKIP); 254 x->q_index = qindex; 255 256 x->errorperbit = rdmult >> 6; 257 x->errorperbit += (x->errorperbit == 0); 258 259 vp9_initialize_me_consts(cpi, x->q_index); 260 } 261 262 void vp9_update_zbin_extra(VP9_COMP *cpi, MACROBLOCK *x) { 263 const int qindex = x->q_index; 264 const int y_zbin_extra = (cpi->common.y_dequant[qindex][1] * 265 (cpi->zbin_mode_boost + x->act_zbin_adj)) >> 7; 266 const int uv_zbin_extra = (cpi->common.uv_dequant[qindex][1] * 267 (cpi->zbin_mode_boost + x->act_zbin_adj)) >> 7; 268 269 x->plane[0].zbin_extra = (int16_t)y_zbin_extra; 270 x->plane[1].zbin_extra = (int16_t)uv_zbin_extra; 271 x->plane[2].zbin_extra = (int16_t)uv_zbin_extra; 272 } 273 274 void vp9_frame_init_quantizer(VP9_COMP *cpi) { 275 cpi->zbin_mode_boost = 0; 276 vp9_init_plane_quantizers(cpi, &cpi->mb); 277 } 278 279 void vp9_set_quantizer(VP9_COMMON *cm, int q) { 280 // quantizer has to be reinitialized with vp9_init_quantizer() if any 281 // delta_q changes. 282 cm->base_qindex = q; 283 cm->y_dc_delta_q = 0; 284 cm->uv_dc_delta_q = 0; 285 cm->uv_ac_delta_q = 0; 286 } 287
