ref: 8050e0219fae86e4b0603904b576adf4d7f39d35
dir: /vp8/encoder/picklpf.c/
/* * Copyright (c) 2010 The WebM project authors. All Rights Reserved. * * Use of this source code is governed by a BSD-style license * that can be found in the LICENSE file in the root of the source * tree. An additional intellectual property rights grant can be found * in the file PATENTS. All contributing project authors may * be found in the AUTHORS file in the root of the source tree. */ #include "./vpx_dsp_rtcd.h" #include "./vpx_scale_rtcd.h" #include "vp8/common/onyxc_int.h" #include "onyx_int.h" #include "vp8/encoder/quantize.h" #include "vpx_mem/vpx_mem.h" #include "vpx_scale/vpx_scale.h" #include "vp8/common/alloccommon.h" #include "vp8/common/loopfilter.h" #if ARCH_ARM #include "vpx_ports/arm.h" #endif extern int vp8_calc_ss_err(YV12_BUFFER_CONFIG *source, YV12_BUFFER_CONFIG *dest); static void yv12_copy_partial_frame(YV12_BUFFER_CONFIG *src_ybc, YV12_BUFFER_CONFIG *dst_ybc) { unsigned char *src_y, *dst_y; int yheight; int ystride; int yoffset; int linestocopy; yheight = src_ybc->y_height; ystride = src_ybc->y_stride; /* number of MB rows to use in partial filtering */ linestocopy = (yheight >> 4) / PARTIAL_FRAME_FRACTION; linestocopy = linestocopy ? linestocopy << 4 : 16; /* 16 lines per MB */ /* Copy extra 4 so that full filter context is available if filtering done * on the copied partial frame and not original. Partial filter does mb * filtering for top row also, which can modify3 pixels above. */ linestocopy += 4; /* partial image starts at ~middle of frame (macroblock border)*/ yoffset = ystride * (((yheight >> 5) * 16) - 4); src_y = src_ybc->y_buffer + yoffset; dst_y = dst_ybc->y_buffer + yoffset; memcpy(dst_y, src_y, ystride * linestocopy); } static int calc_partial_ssl_err(YV12_BUFFER_CONFIG *source, YV12_BUFFER_CONFIG *dest) { int i, j; int Total = 0; int srcoffset, dstoffset; unsigned char *src = source->y_buffer; unsigned char *dst = dest->y_buffer; int linestocopy; /* number of MB rows to use in partial filtering */ linestocopy = (source->y_height >> 4) / PARTIAL_FRAME_FRACTION; linestocopy = linestocopy ? linestocopy << 4 : 16; /* 16 lines per MB */ /* partial image starts at ~middle of frame (macroblock border)*/ srcoffset = source->y_stride * ((dest->y_height >> 5) * 16); dstoffset = dest->y_stride * ((dest->y_height >> 5) * 16); src += srcoffset; dst += dstoffset; /* Loop through the Y plane raw and reconstruction data summing * (square differences) */ for (i = 0; i < linestocopy; i += 16) { for (j = 0; j < source->y_width; j += 16) { unsigned int sse; Total += vpx_mse16x16(src + j, source->y_stride, dst + j, dest->y_stride, &sse); } src += 16 * source->y_stride; dst += 16 * dest->y_stride; } return Total; } /* Enforce a minimum filter level based upon baseline Q */ static int get_min_filter_level(VP8_COMP *cpi, int base_qindex) { int min_filter_level; if (cpi->source_alt_ref_active && cpi->common.refresh_golden_frame && !cpi->common.refresh_alt_ref_frame) min_filter_level = 0; else { if (base_qindex <= 6) min_filter_level = 0; else if (base_qindex <= 16) min_filter_level = 1; else min_filter_level = (base_qindex / 8); } return min_filter_level; } /* Enforce a maximum filter level based upon baseline Q */ static int get_max_filter_level(VP8_COMP *cpi, int base_qindex) { /* PGW August 2006: Highest filter values almost always a bad idea */ /* jbb chg: 20100118 - not so any more with this overquant stuff allow * high values with lots of intra coming in. */ int max_filter_level = MAX_LOOP_FILTER; (void)base_qindex; if (cpi->twopass.section_intra_rating > 8) max_filter_level = MAX_LOOP_FILTER * 3 / 4; return max_filter_level; } void vp8cx_pick_filter_level_fast(YV12_BUFFER_CONFIG *sd, VP8_COMP *cpi) { VP8_COMMON *cm = &cpi->common; int best_err = 0; int filt_err = 0; int min_filter_level = get_min_filter_level(cpi, cm->base_qindex); int max_filter_level = get_max_filter_level(cpi, cm->base_qindex); int filt_val; int best_filt_val; YV12_BUFFER_CONFIG * saved_frame = cm->frame_to_show; /* Replace unfiltered frame buffer with a new one */ cm->frame_to_show = &cpi->pick_lf_lvl_frame; if (cm->frame_type == KEY_FRAME) cm->sharpness_level = 0; else cm->sharpness_level = cpi->oxcf.Sharpness; if (cm->sharpness_level != cm->last_sharpness_level) { vp8_loop_filter_update_sharpness(&cm->lf_info, cm->sharpness_level); cm->last_sharpness_level = cm->sharpness_level; } /* Start the search at the previous frame filter level unless it is * now out of range. */ if (cm->filter_level < min_filter_level) cm->filter_level = min_filter_level; else if (cm->filter_level > max_filter_level) cm->filter_level = max_filter_level; filt_val = cm->filter_level; best_filt_val = filt_val; /* Get the err using the previous frame's filter value. */ /* Copy the unfiltered / processed recon buffer to the new buffer */ yv12_copy_partial_frame(saved_frame, cm->frame_to_show); vp8_loop_filter_partial_frame(cm, &cpi->mb.e_mbd, filt_val); best_err = calc_partial_ssl_err(sd, cm->frame_to_show); filt_val -= 1 + (filt_val > 10); /* Search lower filter levels */ while (filt_val >= min_filter_level) { /* Apply the loop filter */ yv12_copy_partial_frame(saved_frame, cm->frame_to_show); vp8_loop_filter_partial_frame(cm, &cpi->mb.e_mbd, filt_val); /* Get the err for filtered frame */ filt_err = calc_partial_ssl_err(sd, cm->frame_to_show); /* Update the best case record or exit loop. */ if (filt_err < best_err) { best_err = filt_err; best_filt_val = filt_val; } else break; /* Adjust filter level */ filt_val -= 1 + (filt_val > 10); } /* Search up (note that we have already done filt_val = cm->filter_level) */ filt_val = cm->filter_level + 1 + (filt_val > 10); if (best_filt_val == cm->filter_level) { /* Resist raising filter level for very small gains */ best_err -= (best_err >> 10); while (filt_val < max_filter_level) { /* Apply the loop filter */ yv12_copy_partial_frame(saved_frame, cm->frame_to_show); vp8_loop_filter_partial_frame(cm, &cpi->mb.e_mbd, filt_val); /* Get the err for filtered frame */ filt_err = calc_partial_ssl_err(sd, cm->frame_to_show); /* Update the best case record or exit loop. */ if (filt_err < best_err) { /* Do not raise filter level if improvement is < 1 part * in 4096 */ best_err = filt_err - (filt_err >> 10); best_filt_val = filt_val; } else break; /* Adjust filter level */ filt_val += 1 + (filt_val > 10); } } cm->filter_level = best_filt_val; if (cm->filter_level < min_filter_level) cm->filter_level = min_filter_level; if (cm->filter_level > max_filter_level) cm->filter_level = max_filter_level; /* restore unfiltered frame pointer */ cm->frame_to_show = saved_frame; } /* Stub function for now Alt LF not used */ void vp8cx_set_alt_lf_level(VP8_COMP *cpi, int filt_val) { MACROBLOCKD *mbd = &cpi->mb.e_mbd; (void) filt_val; mbd->segment_feature_data[MB_LVL_ALT_LF][0] = cpi->segment_feature_data[MB_LVL_ALT_LF][0]; mbd->segment_feature_data[MB_LVL_ALT_LF][1] = cpi->segment_feature_data[MB_LVL_ALT_LF][1]; mbd->segment_feature_data[MB_LVL_ALT_LF][2] = cpi->segment_feature_data[MB_LVL_ALT_LF][2]; mbd->segment_feature_data[MB_LVL_ALT_LF][3] = cpi->segment_feature_data[MB_LVL_ALT_LF][3]; } void vp8cx_pick_filter_level(YV12_BUFFER_CONFIG *sd, VP8_COMP *cpi) { VP8_COMMON *cm = &cpi->common; int best_err = 0; int filt_err = 0; int min_filter_level = get_min_filter_level(cpi, cm->base_qindex); int max_filter_level = get_max_filter_level(cpi, cm->base_qindex); int filter_step; int filt_high = 0; int filt_mid; int filt_low = 0; int filt_best; int filt_direction = 0; /* Bias against raising loop filter and in favor of lowering it */ int Bias = 0; int ss_err[MAX_LOOP_FILTER + 1]; YV12_BUFFER_CONFIG * saved_frame = cm->frame_to_show; memset(ss_err, 0, sizeof(ss_err)); /* Replace unfiltered frame buffer with a new one */ cm->frame_to_show = &cpi->pick_lf_lvl_frame; if (cm->frame_type == KEY_FRAME) cm->sharpness_level = 0; else cm->sharpness_level = cpi->oxcf.Sharpness; /* Start the search at the previous frame filter level unless it is * now out of range. */ filt_mid = cm->filter_level; if (filt_mid < min_filter_level) filt_mid = min_filter_level; else if (filt_mid > max_filter_level) filt_mid = max_filter_level; /* Define the initial step size */ filter_step = (filt_mid < 16) ? 4 : filt_mid / 4; /* Get baseline error score */ /* Copy the unfiltered / processed recon buffer to the new buffer */ vpx_yv12_copy_y(saved_frame, cm->frame_to_show); vp8cx_set_alt_lf_level(cpi, filt_mid); vp8_loop_filter_frame_yonly(cm, &cpi->mb.e_mbd, filt_mid); best_err = vp8_calc_ss_err(sd, cm->frame_to_show); ss_err[filt_mid] = best_err; filt_best = filt_mid; while (filter_step > 0) { Bias = (best_err >> (15 - (filt_mid / 8))) * filter_step; if (cpi->twopass.section_intra_rating < 20) Bias = Bias * cpi->twopass.section_intra_rating / 20; filt_high = ((filt_mid + filter_step) > max_filter_level) ? max_filter_level : (filt_mid + filter_step); filt_low = ((filt_mid - filter_step) < min_filter_level) ? min_filter_level : (filt_mid - filter_step); if ((filt_direction <= 0) && (filt_low != filt_mid)) { if(ss_err[filt_low] == 0) { /* Get Low filter error score */ vpx_yv12_copy_y(saved_frame, cm->frame_to_show); vp8cx_set_alt_lf_level(cpi, filt_low); vp8_loop_filter_frame_yonly(cm, &cpi->mb.e_mbd, filt_low); filt_err = vp8_calc_ss_err(sd, cm->frame_to_show); ss_err[filt_low] = filt_err; } else filt_err = ss_err[filt_low]; /* If value is close to the best so far then bias towards a * lower loop filter value. */ if ((filt_err - Bias) < best_err) { /* Was it actually better than the previous best? */ if (filt_err < best_err) best_err = filt_err; filt_best = filt_low; } } /* Now look at filt_high */ if ((filt_direction >= 0) && (filt_high != filt_mid)) { if(ss_err[filt_high] == 0) { vpx_yv12_copy_y(saved_frame, cm->frame_to_show); vp8cx_set_alt_lf_level(cpi, filt_high); vp8_loop_filter_frame_yonly(cm, &cpi->mb.e_mbd, filt_high); filt_err = vp8_calc_ss_err(sd, cm->frame_to_show); ss_err[filt_high] = filt_err; } else filt_err = ss_err[filt_high]; /* Was it better than the previous best? */ if (filt_err < (best_err - Bias)) { best_err = filt_err; filt_best = filt_high; } } /* Half the step distance if the best filter value was the same * as last time */ if (filt_best == filt_mid) { filter_step = filter_step / 2; filt_direction = 0; } else { filt_direction = (filt_best < filt_mid) ? -1 : 1; filt_mid = filt_best; } } cm->filter_level = filt_best; /* restore unfiltered frame pointer */ cm->frame_to_show = saved_frame; }