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
vp9_quantize_b_c(const int16_t * coeff_ptr,intptr_t count,int skip_block,const int16_t * zbin_ptr,const int16_t * round_ptr,const int16_t * quant_ptr,const int16_t * quant_shift_ptr,int16_t * qcoeff_ptr,int16_t * dqcoeff_ptr,const int16_t * dequant_ptr,int zbin_oq_value,uint16_t * eob_ptr,const int16_t * scan,const int16_t * iscan)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
vp9_quantize_b_32x32_c(const int16_t * coeff_ptr,intptr_t n_coeffs,int skip_block,const int16_t * zbin_ptr,const int16_t * round_ptr,const int16_t * quant_ptr,const int16_t * quant_shift_ptr,int16_t * qcoeff_ptr,int16_t * dqcoeff_ptr,const int16_t * dequant_ptr,int zbin_oq_value,uint16_t * eob_ptr,const int16_t * scan,const int16_t * iscan)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
vp9_regular_quantize_b_4x4(MACROBLOCK * x,int plane,int block,const int16_t * scan,const int16_t * iscan)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
invert_quant(int16_t * quant,int16_t * shift,int d)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
vp9_init_quantizer(VP9_COMP * cpi)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
vp9_init_plane_quantizers(VP9_COMP * cpi,MACROBLOCK * x)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
vp9_update_zbin_extra(VP9_COMP * cpi,MACROBLOCK * x)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
vp9_frame_init_quantizer(VP9_COMP * cpi)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
vp9_set_quantizer(VP9_COMMON * cm,int q)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