ref: 67aa6c8c23bc6ca90cfde756015f0aae61fe20f7
dir: /vp8/common/mfqe.c/
/*
* Copyright (c) 2012 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.
*/
/* MFQE: Multiframe Quality Enhancement
* In rate limited situations keyframes may cause significant visual artifacts
* commonly referred to as "popping." This file implements a postproccesing
* algorithm which blends data from the preceeding frame when there is no
* motion and the q from the previous frame is lower which indicates that it is
* higher quality.
*/
#include "./vp8_rtcd.h"
#include "./vpx_dsp_rtcd.h"
#include "vp8/common/common.h"
#include "vp8/common/postproc.h"
#include "vpx_dsp/variance.h"
#include "vpx_mem/vpx_mem.h"
#include "vpx_scale/yv12config.h"
#include <limits.h>
#include <stdlib.h>
static void filter_by_weight(unsigned char *src, int src_stride,
unsigned char *dst, int dst_stride, int block_size,
int src_weight) {
int dst_weight = (1 << MFQE_PRECISION) - src_weight;
int rounding_bit = 1 << (MFQE_PRECISION - 1);
int r, c;
for (r = 0; r < block_size; ++r) {
for (c = 0; c < block_size; ++c) {
dst[c] = (src[c] * src_weight + dst[c] * dst_weight + rounding_bit) >>
MFQE_PRECISION;
}
src += src_stride;
dst += dst_stride;
}
}
void vp8_filter_by_weight16x16_c(unsigned char *src, int src_stride,
unsigned char *dst, int dst_stride,
int src_weight) {
filter_by_weight(src, src_stride, dst, dst_stride, 16, src_weight);
}
void vp8_filter_by_weight8x8_c(unsigned char *src, int src_stride,
unsigned char *dst, int dst_stride,
int src_weight) {
filter_by_weight(src, src_stride, dst, dst_stride, 8, src_weight);
}
void vp8_filter_by_weight4x4_c(unsigned char *src, int src_stride,
unsigned char *dst, int dst_stride,
int src_weight) {
filter_by_weight(src, src_stride, dst, dst_stride, 4, src_weight);
}
static void apply_ifactor(unsigned char *y_src, int y_src_stride,
unsigned char *y_dst, int y_dst_stride,
unsigned char *u_src, unsigned char *v_src,
int uv_src_stride, unsigned char *u_dst,
unsigned char *v_dst, int uv_dst_stride,
int block_size, int src_weight) {
if (block_size == 16) {
vp8_filter_by_weight16x16(y_src, y_src_stride, y_dst, y_dst_stride,
src_weight);
vp8_filter_by_weight8x8(u_src, uv_src_stride, u_dst, uv_dst_stride,
src_weight);
vp8_filter_by_weight8x8(v_src, uv_src_stride, v_dst, uv_dst_stride,
src_weight);
} else {
vp8_filter_by_weight8x8(y_src, y_src_stride, y_dst, y_dst_stride,
src_weight);
vp8_filter_by_weight4x4(u_src, uv_src_stride, u_dst, uv_dst_stride,
src_weight);
vp8_filter_by_weight4x4(v_src, uv_src_stride, v_dst, uv_dst_stride,
src_weight);
}
}
static unsigned int int_sqrt(unsigned int x) {
unsigned int y = x;
unsigned int guess;
int p = 1;
while (y >>= 1) p++;
p >>= 1;
guess = 0;
while (p >= 0) {
guess |= (1 << p);
if (x < guess * guess) guess -= (1 << p);
p--;
}
/* choose between guess or guess+1 */
return guess + (guess * guess + guess + 1 <= x);
}
#define USE_SSD
static void multiframe_quality_enhance_block(
int blksize, /* Currently only values supported are 16, 8 */
int qcurr, int qprev, unsigned char *y, unsigned char *u, unsigned char *v,
int y_stride, int uv_stride, unsigned char *yd, unsigned char *ud,
unsigned char *vd, int yd_stride, int uvd_stride) {
static const unsigned char VP8_ZEROS[16] = { 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0 };
int uvblksize = blksize >> 1;
int qdiff = qcurr - qprev;
int i;
unsigned char *up;
unsigned char *udp;
unsigned char *vp;
unsigned char *vdp;
unsigned int act, actd, sad, usad, vsad, sse, thr, thrsq, actrisk;
if (blksize == 16) {
actd = (vpx_variance16x16(yd, yd_stride, VP8_ZEROS, 0, &sse) + 128) >> 8;
act = (vpx_variance16x16(y, y_stride, VP8_ZEROS, 0, &sse) + 128) >> 8;
#ifdef USE_SSD
vpx_variance16x16(y, y_stride, yd, yd_stride, &sse);
sad = (sse + 128) >> 8;
vpx_variance8x8(u, uv_stride, ud, uvd_stride, &sse);
usad = (sse + 32) >> 6;
vpx_variance8x8(v, uv_stride, vd, uvd_stride, &sse);
vsad = (sse + 32) >> 6;
#else
sad = (vpx_sad16x16(y, y_stride, yd, yd_stride) + 128) >> 8;
usad = (vpx_sad8x8(u, uv_stride, ud, uvd_stride) + 32) >> 6;
vsad = (vpx_sad8x8(v, uv_stride, vd, uvd_stride) + 32) >> 6;
#endif
} else {
actd = (vpx_variance8x8(yd, yd_stride, VP8_ZEROS, 0, &sse) + 32) >> 6;
act = (vpx_variance8x8(y, y_stride, VP8_ZEROS, 0, &sse) + 32) >> 6;
#ifdef USE_SSD
vpx_variance8x8(y, y_stride, yd, yd_stride, &sse);
sad = (sse + 32) >> 6;
vpx_variance4x4(u, uv_stride, ud, uvd_stride, &sse);
usad = (sse + 8) >> 4;
vpx_variance4x4(v, uv_stride, vd, uvd_stride, &sse);
vsad = (sse + 8) >> 4;
#else
sad = (vpx_sad8x8(y, y_stride, yd, yd_stride) + 32) >> 6;
usad = (vpx_sad4x4(u, uv_stride, ud, uvd_stride) + 8) >> 4;
vsad = (vpx_sad4x4(v, uv_stride, vd, uvd_stride) + 8) >> 4;
#endif
}
actrisk = (actd > act * 5);
/* thr = qdiff/16 + log2(act) + log4(qprev) */
thr = (qdiff >> 4);
while (actd >>= 1) thr++;
while (qprev >>= 2) thr++;
#ifdef USE_SSD
thrsq = thr * thr;
if (sad < thrsq &&
/* additional checks for color mismatch and excessive addition of
* high-frequencies */
4 * usad < thrsq && 4 * vsad < thrsq && !actrisk)
#else
if (sad < thr &&
/* additional checks for color mismatch and excessive addition of
* high-frequencies */
2 * usad < thr && 2 * vsad < thr && !actrisk)
#endif
{
int ifactor;
#ifdef USE_SSD
/* TODO: optimize this later to not need sqr root */
sad = int_sqrt(sad);
#endif
ifactor = (sad << MFQE_PRECISION) / thr;
ifactor >>= (qdiff >> 5);
if (ifactor) {
apply_ifactor(y, y_stride, yd, yd_stride, u, v, uv_stride, ud, vd,
uvd_stride, blksize, ifactor);
}
} else { /* else implicitly copy from previous frame */
if (blksize == 16) {
vp8_copy_mem16x16(y, y_stride, yd, yd_stride);
vp8_copy_mem8x8(u, uv_stride, ud, uvd_stride);
vp8_copy_mem8x8(v, uv_stride, vd, uvd_stride);
} else {
vp8_copy_mem8x8(y, y_stride, yd, yd_stride);
for (up = u, udp = ud, i = 0; i < uvblksize;
++i, up += uv_stride, udp += uvd_stride) {
memcpy(udp, up, uvblksize);
}
for (vp = v, vdp = vd, i = 0; i < uvblksize;
++i, vp += uv_stride, vdp += uvd_stride) {
memcpy(vdp, vp, uvblksize);
}
}
}
}
static int qualify_inter_mb(const MODE_INFO *mode_info_context, int *map) {
if (mode_info_context->mbmi.mb_skip_coeff) {
map[0] = map[1] = map[2] = map[3] = 1;
} else if (mode_info_context->mbmi.mode == SPLITMV) {
static int ndx[4][4] = {
{ 0, 1, 4, 5 }, { 2, 3, 6, 7 }, { 8, 9, 12, 13 }, { 10, 11, 14, 15 }
};
int i, j;
vp8_zero(*map);
for (i = 0; i < 4; ++i) {
map[i] = 1;
for (j = 0; j < 4 && map[j]; ++j) {
map[i] &= (mode_info_context->bmi[ndx[i][j]].mv.as_mv.row <= 2 &&
mode_info_context->bmi[ndx[i][j]].mv.as_mv.col <= 2);
}
}
} else {
map[0] = map[1] = map[2] = map[3] =
(mode_info_context->mbmi.mode > B_PRED &&
abs(mode_info_context->mbmi.mv.as_mv.row) <= 2 &&
abs(mode_info_context->mbmi.mv.as_mv.col) <= 2);
}
return (map[0] + map[1] + map[2] + map[3]);
}
void vp8_multiframe_quality_enhance(VP8_COMMON *cm) {
YV12_BUFFER_CONFIG *show = cm->frame_to_show;
YV12_BUFFER_CONFIG *dest = &cm->post_proc_buffer;
FRAME_TYPE frame_type = cm->frame_type;
/* Point at base of Mb MODE_INFO list has motion vectors etc */
const MODE_INFO *mode_info_context = cm->mi;
int mb_row;
int mb_col;
int totmap, map[4];
int qcurr = cm->base_qindex;
int qprev = cm->postproc_state.last_base_qindex;
unsigned char *y_ptr, *u_ptr, *v_ptr;
unsigned char *yd_ptr, *ud_ptr, *vd_ptr;
/* Set up the buffer pointers */
y_ptr = show->y_buffer;
u_ptr = show->u_buffer;
v_ptr = show->v_buffer;
yd_ptr = dest->y_buffer;
ud_ptr = dest->u_buffer;
vd_ptr = dest->v_buffer;
/* postprocess each macro block */
for (mb_row = 0; mb_row < cm->mb_rows; ++mb_row) {
for (mb_col = 0; mb_col < cm->mb_cols; ++mb_col) {
/* if motion is high there will likely be no benefit */
if (frame_type == INTER_FRAME) {
totmap = qualify_inter_mb(mode_info_context, map);
} else {
totmap = (frame_type == KEY_FRAME ? 4 : 0);
}
if (totmap) {
if (totmap < 4) {
int i, j;
for (i = 0; i < 2; ++i) {
for (j = 0; j < 2; ++j) {
if (map[i * 2 + j]) {
multiframe_quality_enhance_block(
8, qcurr, qprev, y_ptr + 8 * (i * show->y_stride + j),
u_ptr + 4 * (i * show->uv_stride + j),
v_ptr + 4 * (i * show->uv_stride + j), show->y_stride,
show->uv_stride, yd_ptr + 8 * (i * dest->y_stride + j),
ud_ptr + 4 * (i * dest->uv_stride + j),
vd_ptr + 4 * (i * dest->uv_stride + j), dest->y_stride,
dest->uv_stride);
} else {
/* copy a 8x8 block */
int k;
unsigned char *up = u_ptr + 4 * (i * show->uv_stride + j);
unsigned char *udp = ud_ptr + 4 * (i * dest->uv_stride + j);
unsigned char *vp = v_ptr + 4 * (i * show->uv_stride + j);
unsigned char *vdp = vd_ptr + 4 * (i * dest->uv_stride + j);
vp8_copy_mem8x8(
y_ptr + 8 * (i * show->y_stride + j), show->y_stride,
yd_ptr + 8 * (i * dest->y_stride + j), dest->y_stride);
for (k = 0; k < 4; ++k, up += show->uv_stride,
udp += dest->uv_stride, vp += show->uv_stride,
vdp += dest->uv_stride) {
memcpy(udp, up, 4);
memcpy(vdp, vp, 4);
}
}
}
}
} else { /* totmap = 4 */
multiframe_quality_enhance_block(
16, qcurr, qprev, y_ptr, u_ptr, v_ptr, show->y_stride,
show->uv_stride, yd_ptr, ud_ptr, vd_ptr, dest->y_stride,
dest->uv_stride);
}
} else {
vp8_copy_mem16x16(y_ptr, show->y_stride, yd_ptr, dest->y_stride);
vp8_copy_mem8x8(u_ptr, show->uv_stride, ud_ptr, dest->uv_stride);
vp8_copy_mem8x8(v_ptr, show->uv_stride, vd_ptr, dest->uv_stride);
}
y_ptr += 16;
u_ptr += 8;
v_ptr += 8;
yd_ptr += 16;
ud_ptr += 8;
vd_ptr += 8;
mode_info_context++; /* step to next MB */
}
y_ptr += show->y_stride * 16 - 16 * cm->mb_cols;
u_ptr += show->uv_stride * 8 - 8 * cm->mb_cols;
v_ptr += show->uv_stride * 8 - 8 * cm->mb_cols;
yd_ptr += dest->y_stride * 16 - 16 * cm->mb_cols;
ud_ptr += dest->uv_stride * 8 - 8 * cm->mb_cols;
vd_ptr += dest->uv_stride * 8 - 8 * cm->mb_cols;
mode_info_context++; /* Skip border mb */
}
}