386 lines
14 KiB
C
386 lines
14 KiB
C
/*
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* Copyright (c) 2012 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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/* MFQE: Multiframe Quality Enhancement
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* In rate limited situations keyframes may cause significant visual artifacts
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* commonly referred to as "popping." This file implements a postproccesing
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* algorithm which blends data from the preceeding frame when there is no
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* motion and the q from the previous frame is lower which indicates that it is
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* higher quality.
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*/
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#include "postproc.h"
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#include "variance.h"
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#include "vpx_mem/vpx_mem.h"
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#include "vp8_rtcd.h"
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#include "vpx_scale/yv12config.h"
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#include <limits.h>
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#include <stdlib.h>
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static void filter_by_weight(unsigned char *src, int src_stride,
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unsigned char *dst, int dst_stride,
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int block_size, int src_weight)
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{
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int dst_weight = (1 << MFQE_PRECISION) - src_weight;
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int rounding_bit = 1 << (MFQE_PRECISION - 1);
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int r, c;
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for (r = 0; r < block_size; r++)
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{
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for (c = 0; c < block_size; c++)
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{
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dst[c] = (src[c] * src_weight +
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dst[c] * dst_weight +
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rounding_bit) >> MFQE_PRECISION;
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}
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src += src_stride;
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dst += dst_stride;
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}
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}
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void vp8_filter_by_weight16x16_c(unsigned char *src, int src_stride,
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unsigned char *dst, int dst_stride,
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int src_weight)
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{
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filter_by_weight(src, src_stride, dst, dst_stride, 16, src_weight);
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}
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void vp8_filter_by_weight8x8_c(unsigned char *src, int src_stride,
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unsigned char *dst, int dst_stride,
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int src_weight)
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{
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filter_by_weight(src, src_stride, dst, dst_stride, 8, src_weight);
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}
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void vp8_filter_by_weight4x4_c(unsigned char *src, int src_stride,
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unsigned char *dst, int dst_stride,
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int src_weight)
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{
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filter_by_weight(src, src_stride, dst, dst_stride, 4, src_weight);
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}
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static void apply_ifactor(unsigned char *y_src,
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int y_src_stride,
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unsigned char *y_dst,
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int y_dst_stride,
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unsigned char *u_src,
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unsigned char *v_src,
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int uv_src_stride,
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unsigned char *u_dst,
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unsigned char *v_dst,
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int uv_dst_stride,
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int block_size,
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int src_weight)
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{
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if (block_size == 16)
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{
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vp8_filter_by_weight16x16(y_src, y_src_stride, y_dst, y_dst_stride, src_weight);
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vp8_filter_by_weight8x8(u_src, uv_src_stride, u_dst, uv_dst_stride, src_weight);
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vp8_filter_by_weight8x8(v_src, uv_src_stride, v_dst, uv_dst_stride, src_weight);
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}
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else /* if (block_size == 8) */
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{
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vp8_filter_by_weight8x8(y_src, y_src_stride, y_dst, y_dst_stride, src_weight);
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vp8_filter_by_weight4x4(u_src, uv_src_stride, u_dst, uv_dst_stride, src_weight);
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vp8_filter_by_weight4x4(v_src, uv_src_stride, v_dst, uv_dst_stride, src_weight);
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}
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}
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static unsigned int int_sqrt(unsigned int x)
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{
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unsigned int y = x;
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unsigned int guess;
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int p = 1;
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while (y>>=1) p++;
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p>>=1;
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guess=0;
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while (p>=0)
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{
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guess |= (1<<p);
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if (x<guess*guess)
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guess -= (1<<p);
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p--;
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}
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/* choose between guess or guess+1 */
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return guess+(guess*guess+guess+1<=x);
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}
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#define USE_SSD
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static void multiframe_quality_enhance_block
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(
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int blksize, /* Currently only values supported are 16, 8 */
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int qcurr,
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int qprev,
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unsigned char *y,
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unsigned char *u,
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unsigned char *v,
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int y_stride,
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int uv_stride,
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unsigned char *yd,
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unsigned char *ud,
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unsigned char *vd,
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int yd_stride,
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int uvd_stride
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)
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{
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static const unsigned char VP8_ZEROS[16]=
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{
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
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};
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int uvblksize = blksize >> 1;
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int qdiff = qcurr - qprev;
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int i;
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unsigned char *up;
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unsigned char *udp;
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unsigned char *vp;
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unsigned char *vdp;
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unsigned int act, actd, sad, usad, vsad, sse, thr, thrsq, actrisk;
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if (blksize == 16)
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{
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actd = (vp8_variance16x16(yd, yd_stride, VP8_ZEROS, 0, &sse)+128)>>8;
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act = (vp8_variance16x16(y, y_stride, VP8_ZEROS, 0, &sse)+128)>>8;
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#ifdef USE_SSD
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sad = (vp8_variance16x16(y, y_stride, yd, yd_stride, &sse));
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sad = (sse + 128)>>8;
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usad = (vp8_variance8x8(u, uv_stride, ud, uvd_stride, &sse));
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usad = (sse + 32)>>6;
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vsad = (vp8_variance8x8(v, uv_stride, vd, uvd_stride, &sse));
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vsad = (sse + 32)>>6;
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#else
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sad = (vp8_sad16x16(y, y_stride, yd, yd_stride, UINT_MAX) + 128) >> 8;
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usad = (vp8_sad8x8(u, uv_stride, ud, uvd_stride, UINT_MAX) + 32) >> 6;
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vsad = (vp8_sad8x8(v, uv_stride, vd, uvd_stride, UINT_MAX)+ 32) >> 6;
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#endif
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}
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else /* if (blksize == 8) */
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{
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actd = (vp8_variance8x8(yd, yd_stride, VP8_ZEROS, 0, &sse)+32)>>6;
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act = (vp8_variance8x8(y, y_stride, VP8_ZEROS, 0, &sse)+32)>>6;
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#ifdef USE_SSD
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sad = (vp8_variance8x8(y, y_stride, yd, yd_stride, &sse));
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sad = (sse + 32)>>6;
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usad = (vp8_variance4x4(u, uv_stride, ud, uvd_stride, &sse));
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usad = (sse + 8)>>4;
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vsad = (vp8_variance4x4(v, uv_stride, vd, uvd_stride, &sse));
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vsad = (sse + 8)>>4;
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#else
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sad = (vp8_sad8x8(y, y_stride, yd, yd_stride, UINT_MAX) + 32) >> 6;
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usad = (vp8_sad4x4(u, uv_stride, ud, uvd_stride, UINT_MAX) + 8) >> 4;
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vsad = (vp8_sad4x4(v, uv_stride, vd, uvd_stride, UINT_MAX) + 8) >> 4;
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#endif
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}
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actrisk = (actd > act * 5);
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/* thr = qdiff/16 + log2(act) + log4(qprev) */
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thr = (qdiff >> 4);
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while (actd >>= 1) thr++;
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while (qprev >>= 2) thr++;
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#ifdef USE_SSD
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thrsq = thr * thr;
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if (sad < thrsq &&
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/* additional checks for color mismatch and excessive addition of
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* high-frequencies */
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4 * usad < thrsq && 4 * vsad < thrsq && !actrisk)
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#else
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if (sad < thr &&
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/* additional checks for color mismatch and excessive addition of
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* high-frequencies */
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2 * usad < thr && 2 * vsad < thr && !actrisk)
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#endif
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{
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int ifactor;
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#ifdef USE_SSD
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/* TODO: optimize this later to not need sqr root */
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sad = int_sqrt(sad);
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#endif
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ifactor = (sad << MFQE_PRECISION) / thr;
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ifactor >>= (qdiff >> 5);
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if (ifactor)
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{
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apply_ifactor(y, y_stride, yd, yd_stride,
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u, v, uv_stride,
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ud, vd, uvd_stride,
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blksize, ifactor);
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}
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}
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else /* else implicitly copy from previous frame */
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{
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if (blksize == 16)
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{
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vp8_copy_mem16x16(y, y_stride, yd, yd_stride);
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vp8_copy_mem8x8(u, uv_stride, ud, uvd_stride);
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vp8_copy_mem8x8(v, uv_stride, vd, uvd_stride);
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}
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else /* if (blksize == 8) */
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{
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vp8_copy_mem8x8(y, y_stride, yd, yd_stride);
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for (up = u, udp = ud, i = 0; i < uvblksize; ++i, up += uv_stride, udp += uvd_stride)
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vpx_memcpy(udp, up, uvblksize);
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for (vp = v, vdp = vd, i = 0; i < uvblksize; ++i, vp += uv_stride, vdp += uvd_stride)
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vpx_memcpy(vdp, vp, uvblksize);
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}
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}
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}
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static int qualify_inter_mb(const MODE_INFO *mode_info_context, int *map)
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{
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if (mode_info_context->mbmi.mb_skip_coeff)
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map[0] = map[1] = map[2] = map[3] = 1;
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else if (mode_info_context->mbmi.mode==SPLITMV)
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{
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static int ndx[4][4] =
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{
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{0, 1, 4, 5},
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{2, 3, 6, 7},
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{8, 9, 12, 13},
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{10, 11, 14, 15}
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};
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int i, j;
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for (i=0; i<4; ++i)
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{
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map[i] = 1;
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for (j=0; j<4 && map[j]; ++j)
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map[i] &= (mode_info_context->bmi[ndx[i][j]].mv.as_mv.row <= 2 &&
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mode_info_context->bmi[ndx[i][j]].mv.as_mv.col <= 2);
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}
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}
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else
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{
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map[0] = map[1] = map[2] = map[3] =
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(mode_info_context->mbmi.mode > B_PRED &&
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abs(mode_info_context->mbmi.mv.as_mv.row) <= 2 &&
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abs(mode_info_context->mbmi.mv.as_mv.col) <= 2);
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}
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return (map[0]+map[1]+map[2]+map[3]);
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}
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void vp8_multiframe_quality_enhance
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(
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VP8_COMMON *cm
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)
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{
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YV12_BUFFER_CONFIG *show = cm->frame_to_show;
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YV12_BUFFER_CONFIG *dest = &cm->post_proc_buffer;
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FRAME_TYPE frame_type = cm->frame_type;
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/* Point at base of Mb MODE_INFO list has motion vectors etc */
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const MODE_INFO *mode_info_context = cm->mi;
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int mb_row;
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int mb_col;
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int totmap, map[4];
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int qcurr = cm->base_qindex;
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int qprev = cm->postproc_state.last_base_qindex;
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unsigned char *y_ptr, *u_ptr, *v_ptr;
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unsigned char *yd_ptr, *ud_ptr, *vd_ptr;
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/* Set up the buffer pointers */
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y_ptr = show->y_buffer;
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u_ptr = show->u_buffer;
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v_ptr = show->v_buffer;
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yd_ptr = dest->y_buffer;
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ud_ptr = dest->u_buffer;
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vd_ptr = dest->v_buffer;
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/* postprocess each macro block */
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for (mb_row = 0; mb_row < cm->mb_rows; mb_row++)
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{
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for (mb_col = 0; mb_col < cm->mb_cols; mb_col++)
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{
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/* if motion is high there will likely be no benefit */
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if (frame_type == INTER_FRAME) totmap = qualify_inter_mb(mode_info_context, map);
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else totmap = (frame_type == KEY_FRAME ? 4 : 0);
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if (totmap)
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{
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if (totmap < 4)
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{
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int i, j;
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for (i=0; i<2; ++i)
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for (j=0; j<2; ++j)
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{
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if (map[i*2+j])
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{
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multiframe_quality_enhance_block(8, qcurr, qprev,
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y_ptr + 8*(i*show->y_stride+j),
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u_ptr + 4*(i*show->uv_stride+j),
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v_ptr + 4*(i*show->uv_stride+j),
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show->y_stride,
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show->uv_stride,
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yd_ptr + 8*(i*dest->y_stride+j),
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ud_ptr + 4*(i*dest->uv_stride+j),
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vd_ptr + 4*(i*dest->uv_stride+j),
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dest->y_stride,
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dest->uv_stride);
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}
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else
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{
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/* copy a 8x8 block */
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int k;
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unsigned char *up = u_ptr + 4*(i*show->uv_stride+j);
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unsigned char *udp = ud_ptr + 4*(i*dest->uv_stride+j);
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unsigned char *vp = v_ptr + 4*(i*show->uv_stride+j);
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unsigned char *vdp = vd_ptr + 4*(i*dest->uv_stride+j);
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vp8_copy_mem8x8(y_ptr + 8*(i*show->y_stride+j), show->y_stride,
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yd_ptr + 8*(i*dest->y_stride+j), dest->y_stride);
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for (k = 0; k < 4; ++k, up += show->uv_stride, udp += dest->uv_stride,
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vp += show->uv_stride, vdp += dest->uv_stride)
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{
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vpx_memcpy(udp, up, 4);
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vpx_memcpy(vdp, vp, 4);
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}
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}
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}
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}
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else /* totmap = 4 */
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{
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multiframe_quality_enhance_block(16, qcurr, qprev, y_ptr,
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u_ptr, v_ptr,
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show->y_stride,
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show->uv_stride,
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yd_ptr, ud_ptr, vd_ptr,
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dest->y_stride,
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dest->uv_stride);
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}
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}
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else
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{
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vp8_copy_mem16x16(y_ptr, show->y_stride, yd_ptr, dest->y_stride);
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vp8_copy_mem8x8(u_ptr, show->uv_stride, ud_ptr, dest->uv_stride);
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vp8_copy_mem8x8(v_ptr, show->uv_stride, vd_ptr, dest->uv_stride);
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}
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y_ptr += 16;
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u_ptr += 8;
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v_ptr += 8;
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yd_ptr += 16;
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ud_ptr += 8;
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vd_ptr += 8;
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mode_info_context++; /* step to next MB */
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}
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y_ptr += show->y_stride * 16 - 16 * cm->mb_cols;
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u_ptr += show->uv_stride * 8 - 8 * cm->mb_cols;
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v_ptr += show->uv_stride * 8 - 8 * cm->mb_cols;
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yd_ptr += dest->y_stride * 16 - 16 * cm->mb_cols;
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ud_ptr += dest->uv_stride * 8 - 8 * cm->mb_cols;
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vd_ptr += dest->uv_stride * 8 - 8 * cm->mb_cols;
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mode_info_context++; /* Skip border mb */
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}
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}
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