diff options
Diffstat (limited to 'media/libvpx/vp8/encoder/picklpf.c')
| -rw-r--r-- | media/libvpx/vp8/encoder/picklpf.c | 407 |
1 files changed, 407 insertions, 0 deletions
diff --git a/media/libvpx/vp8/encoder/picklpf.c b/media/libvpx/vp8/encoder/picklpf.c new file mode 100644 index 000000000..875b37f68 --- /dev/null +++ b/media/libvpx/vp8/encoder/picklpf.c @@ -0,0 +1,407 @@ +/* + * 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 "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; +} |