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