2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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.
12 #include "./vpx_scale_rtcd.h"
13 #include "vp8/common/onyxc_int.h"
16 #include "vpx_mem/vpx_mem.h"
17 #include "vpx_scale/vpx_scale.h"
18 #include "vp8/common/alloccommon.h"
19 #include "vp8/common/loopfilter.h"
21 #include "vpx_ports/arm.h"
24 extern int vp8_calc_ss_err(YV12_BUFFER_CONFIG *source, YV12_BUFFER_CONFIG *dest);
26 static void yv12_copy_partial_frame(YV12_BUFFER_CONFIG *src_ybc,
27 YV12_BUFFER_CONFIG *dst_ybc)
29 unsigned char *src_y, *dst_y;
35 yheight = src_ybc->y_height;
36 ystride = src_ybc->y_stride;
38 /* number of MB rows to use in partial filtering */
39 linestocopy = (yheight >> 4) / PARTIAL_FRAME_FRACTION;
40 linestocopy = linestocopy ? linestocopy << 4 : 16; /* 16 lines per MB */
42 /* Copy extra 4 so that full filter context is available if filtering done
43 * on the copied partial frame and not original. Partial filter does mb
44 * filtering for top row also, which can modify3 pixels above.
47 /* partial image starts at ~middle of frame (macroblock border)*/
48 yoffset = ystride * (((yheight >> 5) * 16) - 4);
49 src_y = src_ybc->y_buffer + yoffset;
50 dst_y = dst_ybc->y_buffer + yoffset;
52 vpx_memcpy(dst_y, src_y, ystride * linestocopy);
55 static int calc_partial_ssl_err(YV12_BUFFER_CONFIG *source,
56 YV12_BUFFER_CONFIG *dest)
60 int srcoffset, dstoffset;
61 unsigned char *src = source->y_buffer;
62 unsigned char *dst = dest->y_buffer;
66 /* number of MB rows to use in partial filtering */
67 linestocopy = (source->y_height >> 4) / PARTIAL_FRAME_FRACTION;
68 linestocopy = linestocopy ? linestocopy << 4 : 16; /* 16 lines per MB */
71 /* partial image starts at ~middle of frame (macroblock border)*/
72 srcoffset = source->y_stride * ((dest->y_height >> 5) * 16);
73 dstoffset = dest->y_stride * ((dest->y_height >> 5) * 16);
78 /* Loop through the Y plane raw and reconstruction data summing
79 * (square differences)
81 for (i = 0; i < linestocopy; i += 16)
83 for (j = 0; j < source->y_width; j += 16)
86 Total += vp8_mse16x16(src + j, source->y_stride,
87 dst + j, dest->y_stride,
91 src += 16 * source->y_stride;
92 dst += 16 * dest->y_stride;
98 /* Enforce a minimum filter level based upon baseline Q */
99 static int get_min_filter_level(VP8_COMP *cpi, int base_qindex)
101 int min_filter_level;
103 if (cpi->source_alt_ref_active && cpi->common.refresh_golden_frame &&
104 !cpi->common.refresh_alt_ref_frame)
105 min_filter_level = 0;
108 if (base_qindex <= 6)
109 min_filter_level = 0;
110 else if (base_qindex <= 16)
111 min_filter_level = 1;
113 min_filter_level = (base_qindex / 8);
116 return min_filter_level;
119 /* Enforce a maximum filter level based upon baseline Q */
120 static int get_max_filter_level(VP8_COMP *cpi, int base_qindex)
122 /* PGW August 2006: Highest filter values almost always a bad idea */
124 /* jbb chg: 20100118 - not so any more with this overquant stuff allow
125 * high values with lots of intra coming in.
127 int max_filter_level = MAX_LOOP_FILTER;
130 if (cpi->twopass.section_intra_rating > 8)
131 max_filter_level = MAX_LOOP_FILTER * 3 / 4;
133 return max_filter_level;
136 void vp8cx_pick_filter_level_fast(YV12_BUFFER_CONFIG *sd, VP8_COMP *cpi)
138 VP8_COMMON *cm = &cpi->common;
142 int min_filter_level = get_min_filter_level(cpi, cm->base_qindex);
143 int max_filter_level = get_max_filter_level(cpi, cm->base_qindex);
145 int best_filt_val = cm->filter_level;
146 YV12_BUFFER_CONFIG * saved_frame = cm->frame_to_show;
148 /* Replace unfiltered frame buffer with a new one */
149 cm->frame_to_show = &cpi->pick_lf_lvl_frame;
151 if (cm->frame_type == KEY_FRAME)
152 cm->sharpness_level = 0;
154 cm->sharpness_level = cpi->oxcf.Sharpness;
156 if (cm->sharpness_level != cm->last_sharpness_level)
158 vp8_loop_filter_update_sharpness(&cm->lf_info, cm->sharpness_level);
159 cm->last_sharpness_level = cm->sharpness_level;
162 /* Start the search at the previous frame filter level unless it is
165 if (cm->filter_level < min_filter_level)
166 cm->filter_level = min_filter_level;
167 else if (cm->filter_level > max_filter_level)
168 cm->filter_level = max_filter_level;
170 filt_val = cm->filter_level;
171 best_filt_val = filt_val;
173 /* Get the err using the previous frame's filter value. */
175 /* Copy the unfiltered / processed recon buffer to the new buffer */
176 yv12_copy_partial_frame(saved_frame, cm->frame_to_show);
177 vp8_loop_filter_partial_frame(cm, &cpi->mb.e_mbd, filt_val);
179 best_err = calc_partial_ssl_err(sd, cm->frame_to_show);
181 filt_val -= 1 + (filt_val > 10);
183 /* Search lower filter levels */
184 while (filt_val >= min_filter_level)
186 /* Apply the loop filter */
187 yv12_copy_partial_frame(saved_frame, cm->frame_to_show);
188 vp8_loop_filter_partial_frame(cm, &cpi->mb.e_mbd, filt_val);
190 /* Get the err for filtered frame */
191 filt_err = calc_partial_ssl_err(sd, cm->frame_to_show);
193 /* Update the best case record or exit loop. */
194 if (filt_err < best_err)
197 best_filt_val = filt_val;
202 /* Adjust filter level */
203 filt_val -= 1 + (filt_val > 10);
206 /* Search up (note that we have already done filt_val = cm->filter_level) */
207 filt_val = cm->filter_level + 1 + (filt_val > 10);
209 if (best_filt_val == cm->filter_level)
211 /* Resist raising filter level for very small gains */
212 best_err -= (best_err >> 10);
214 while (filt_val < max_filter_level)
216 /* Apply the loop filter */
217 yv12_copy_partial_frame(saved_frame, cm->frame_to_show);
219 vp8_loop_filter_partial_frame(cm, &cpi->mb.e_mbd, filt_val);
221 /* Get the err for filtered frame */
222 filt_err = calc_partial_ssl_err(sd, cm->frame_to_show);
224 /* Update the best case record or exit loop. */
225 if (filt_err < best_err)
227 /* Do not raise filter level if improvement is < 1 part
230 best_err = filt_err - (filt_err >> 10);
232 best_filt_val = filt_val;
237 /* Adjust filter level */
238 filt_val += 1 + (filt_val > 10);
242 cm->filter_level = best_filt_val;
244 if (cm->filter_level < min_filter_level)
245 cm->filter_level = min_filter_level;
247 if (cm->filter_level > max_filter_level)
248 cm->filter_level = max_filter_level;
250 /* restore unfiltered frame pointer */
251 cm->frame_to_show = saved_frame;
254 /* Stub function for now Alt LF not used */
255 void vp8cx_set_alt_lf_level(VP8_COMP *cpi, int filt_val)
257 MACROBLOCKD *mbd = &cpi->mb.e_mbd;
260 mbd->segment_feature_data[MB_LVL_ALT_LF][0] = cpi->segment_feature_data[MB_LVL_ALT_LF][0];
261 mbd->segment_feature_data[MB_LVL_ALT_LF][1] = cpi->segment_feature_data[MB_LVL_ALT_LF][1];
262 mbd->segment_feature_data[MB_LVL_ALT_LF][2] = cpi->segment_feature_data[MB_LVL_ALT_LF][2];
263 mbd->segment_feature_data[MB_LVL_ALT_LF][3] = cpi->segment_feature_data[MB_LVL_ALT_LF][3];
266 void vp8cx_pick_filter_level(YV12_BUFFER_CONFIG *sd, VP8_COMP *cpi)
268 VP8_COMMON *cm = &cpi->common;
272 int min_filter_level = get_min_filter_level(cpi, cm->base_qindex);
273 int max_filter_level = get_max_filter_level(cpi, cm->base_qindex);
277 /* Start search at previous frame filter level */
278 int filt_mid = cm->filter_level;
281 int filt_direction = 0;
283 /* Bias against raising loop filter and in favor of lowering it */
286 int ss_err[MAX_LOOP_FILTER + 1];
288 YV12_BUFFER_CONFIG * saved_frame = cm->frame_to_show;
290 vpx_memset(ss_err, 0, sizeof(ss_err));
292 /* Replace unfiltered frame buffer with a new one */
293 cm->frame_to_show = &cpi->pick_lf_lvl_frame;
295 if (cm->frame_type == KEY_FRAME)
296 cm->sharpness_level = 0;
298 cm->sharpness_level = cpi->oxcf.Sharpness;
300 /* Start the search at the previous frame filter level unless it is
303 filt_mid = cm->filter_level;
305 if (filt_mid < min_filter_level)
306 filt_mid = min_filter_level;
307 else if (filt_mid > max_filter_level)
308 filt_mid = max_filter_level;
310 /* Define the initial step size */
311 filter_step = (filt_mid < 16) ? 4 : filt_mid / 4;
313 /* Get baseline error score */
315 /* Copy the unfiltered / processed recon buffer to the new buffer */
316 vpx_yv12_copy_y(saved_frame, cm->frame_to_show);
318 vp8cx_set_alt_lf_level(cpi, filt_mid);
319 vp8_loop_filter_frame_yonly(cm, &cpi->mb.e_mbd, filt_mid);
321 best_err = vp8_calc_ss_err(sd, cm->frame_to_show);
323 ss_err[filt_mid] = best_err;
325 filt_best = filt_mid;
327 while (filter_step > 0)
329 Bias = (best_err >> (15 - (filt_mid / 8))) * filter_step;
331 if (cpi->twopass.section_intra_rating < 20)
332 Bias = Bias * cpi->twopass.section_intra_rating / 20;
334 filt_high = ((filt_mid + filter_step) > max_filter_level) ? max_filter_level : (filt_mid + filter_step);
335 filt_low = ((filt_mid - filter_step) < min_filter_level) ? min_filter_level : (filt_mid - filter_step);
337 if ((filt_direction <= 0) && (filt_low != filt_mid))
339 if(ss_err[filt_low] == 0)
341 /* Get Low filter error score */
342 vpx_yv12_copy_y(saved_frame, cm->frame_to_show);
343 vp8cx_set_alt_lf_level(cpi, filt_low);
344 vp8_loop_filter_frame_yonly(cm, &cpi->mb.e_mbd, filt_low);
346 filt_err = vp8_calc_ss_err(sd, cm->frame_to_show);
347 ss_err[filt_low] = filt_err;
350 filt_err = ss_err[filt_low];
352 /* If value is close to the best so far then bias towards a
353 * lower loop filter value.
355 if ((filt_err - Bias) < best_err)
357 /* Was it actually better than the previous best? */
358 if (filt_err < best_err)
361 filt_best = filt_low;
365 /* Now look at filt_high */
366 if ((filt_direction >= 0) && (filt_high != filt_mid))
368 if(ss_err[filt_high] == 0)
370 vpx_yv12_copy_y(saved_frame, cm->frame_to_show);
371 vp8cx_set_alt_lf_level(cpi, filt_high);
372 vp8_loop_filter_frame_yonly(cm, &cpi->mb.e_mbd, filt_high);
374 filt_err = vp8_calc_ss_err(sd, cm->frame_to_show);
375 ss_err[filt_high] = filt_err;
378 filt_err = ss_err[filt_high];
380 /* Was it better than the previous best? */
381 if (filt_err < (best_err - Bias))
384 filt_best = filt_high;
388 /* Half the step distance if the best filter value was the same
391 if (filt_best == filt_mid)
393 filter_step = filter_step / 2;
398 filt_direction = (filt_best < filt_mid) ? -1 : 1;
399 filt_mid = filt_best;
403 cm->filter_level = filt_best;
405 /* restore unfiltered frame pointer */
406 cm->frame_to_show = saved_frame;