ref: 08491b8665d205dcd7c9038a156deac269eb5fe1
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 "vp8/common/onyxc_int.h"
#include "onyx_int.h"
#include "quantize.h"
#include "vpx_mem/vpx_mem.h"
#include "vpx_scale/yv12extend.h"
#include "vpx_scale/vpxscale.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, const vp8_variance_rtcd_vtable_t *rtcd);
#if HAVE_ARMV7
extern void vp8_yv12_copy_frame_yonly_no_extend_frame_borders_neon(YV12_BUFFER_CONFIG *src_ybc, YV12_BUFFER_CONFIG *dst_ybc);
#endif
#if CONFIG_RUNTIME_CPU_DETECT
#define IF_RTCD(x) (x)
#else
#define IF_RTCD(x) NULL
#endif
extern void
(*vp8_yv12_copy_partial_frame_ptr)(YV12_BUFFER_CONFIG *src_ybc,
YV12_BUFFER_CONFIG *dst_ybc,
int Fraction);
void
vp8_yv12_copy_partial_frame(YV12_BUFFER_CONFIG *src_ybc, YV12_BUFFER_CONFIG *dst_ybc, int Fraction)
{
unsigned char *src_y, *dst_y;
int yheight;
int ystride;
int border;
int yoffset;
int linestocopy;
border = src_ybc->border;
yheight = src_ybc->y_height;
ystride = src_ybc->y_stride;
linestocopy = (yheight >> (Fraction + 4));
if (linestocopy < 1)
linestocopy = 1;
linestocopy <<= 4;
yoffset = ystride * ((yheight >> 5) * 16 - 8);
src_y = src_ybc->y_buffer + yoffset;
dst_y = dst_ybc->y_buffer + yoffset;
vpx_memcpy(dst_y, src_y, ystride *(linestocopy + 16));
}
static int vp8_calc_partial_ssl_err(YV12_BUFFER_CONFIG *source, YV12_BUFFER_CONFIG *dest, int Fraction, const vp8_variance_rtcd_vtable_t *rtcd)
{
int i, j;
int Total = 0;
int srcoffset, dstoffset;
unsigned char *src = source->y_buffer;
unsigned char *dst = dest->y_buffer;
int linestocopy = (source->y_height >> (Fraction + 4));
(void)rtcd;
if (linestocopy < 1)
linestocopy = 1;
linestocopy <<= 4;
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 += VARIANCE_INVOKE(rtcd, 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 ;//* 3 / 4;
(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 = cm->filter_level;
// Make a copy of the unfiltered / processed recon buffer
vp8_yv12_copy_partial_frame_ptr(cm->frame_to_show, &cpi->last_frame_uf, 3);
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.
vp8_loop_filter_partial_frame(cm, &cpi->mb.e_mbd, filt_val);
best_err = vp8_calc_partial_ssl_err(sd, cm->frame_to_show, 3, IF_RTCD(&cpi->rtcd.variance));
// Re-instate the unfiltered frame
vp8_yv12_copy_partial_frame_ptr(&cpi->last_frame_uf, cm->frame_to_show, 3);
filt_val -= (1 + ((filt_val > 10) ? 1 : 0));
// Search lower filter levels
while (filt_val >= min_filter_level)
{
// Apply the loop filter
vp8_loop_filter_partial_frame(cm, &cpi->mb.e_mbd, filt_val);
// Get the err for filtered frame
filt_err = vp8_calc_partial_ssl_err(sd, cm->frame_to_show, 3, IF_RTCD(&cpi->rtcd.variance));
// Re-instate the unfiltered frame
vp8_yv12_copy_partial_frame_ptr(&cpi->last_frame_uf, cm->frame_to_show, 3);
// 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) ? 1 : 0));
}
// Search up (note that we have already done filt_val = cm->filter_level)
filt_val = cm->filter_level + (1 + ((filt_val > 10) ? 1 : 0));
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
vp8_loop_filter_partial_frame(cm, &cpi->mb.e_mbd, filt_val);
// Get the err for filtered frame
filt_err = vp8_calc_partial_ssl_err(sd, cm->frame_to_show, 3, IF_RTCD(&cpi->rtcd.variance));
// Re-instate the unfiltered frame
vp8_yv12_copy_partial_frame_ptr(&cpi->last_frame_uf, cm->frame_to_show, 3);
// 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) ? 1 : 0));
}
}
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;
}
// Stub function for now Alt LF not used
void vp8cx_set_alt_lf_level(VP8_COMP *cpi, int filt_val)
{
}
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 = cm->filter_level; // Start search at previous frame filter level
int filt_low = 0;
int filt_best;
int filt_direction = 0;
int Bias = 0; // Bias against raising loop filter and in favour of lowering it
// Make a copy of the unfiltered / processed recon buffer
#if HAVE_ARMV7
#if CONFIG_RUNTIME_CPU_DETECT
if (cm->rtcd.flags & HAS_NEON)
#endif
{
vp8_yv12_copy_frame_yonly_no_extend_frame_borders_neon(cm->frame_to_show, &cpi->last_frame_uf);
}
#if CONFIG_RUNTIME_CPU_DETECT
else
#endif
#endif
#if !HAVE_ARMV7 || CONFIG_RUNTIME_CPU_DETECT
{
vp8_yv12_copy_frame_ptr(cm->frame_to_show, &cpi->last_frame_uf);
}
#endif
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
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, IF_RTCD(&cpi->rtcd.variance));
filt_best = filt_mid;
// Re-instate the unfiltered frame
#if HAVE_ARMV7
#if CONFIG_RUNTIME_CPU_DETECT
if (cm->rtcd.flags & HAS_NEON)
#endif
{
vp8_yv12_copy_frame_yonly_no_extend_frame_borders_neon(&cpi->last_frame_uf, cm->frame_to_show);
}
#if CONFIG_RUNTIME_CPU_DETECT
else
#endif
#endif
#if !HAVE_ARMV7 || CONFIG_RUNTIME_CPU_DETECT
{
vp8_yv12_copy_frame_yonly_ptr(&cpi->last_frame_uf, cm->frame_to_show);
}
#endif
while (filter_step > 0)
{
Bias = (best_err >> (15 - (filt_mid / 8))) * filter_step; //PGW change 12/12/06 for small images
// jbb chg: 20100118 - in sections with lots of new material coming in don't bias as much to a low filter value
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))
{
// Get Low filter error score
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, IF_RTCD(&cpi->rtcd.variance));
// Re-instate the unfiltered frame
#if HAVE_ARMV7
#if CONFIG_RUNTIME_CPU_DETECT
if (cm->rtcd.flags & HAS_NEON)
#endif
{
vp8_yv12_copy_frame_yonly_no_extend_frame_borders_neon(&cpi->last_frame_uf, cm->frame_to_show);
}
#if CONFIG_RUNTIME_CPU_DETECT
else
#endif
#endif
#if !HAVE_ARMV7 || CONFIG_RUNTIME_CPU_DETECT
{
vp8_yv12_copy_frame_yonly_ptr(&cpi->last_frame_uf, cm->frame_to_show);
}
#endif
// 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))
{
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, IF_RTCD(&cpi->rtcd.variance));
// Re-instate the unfiltered frame
#if HAVE_ARMV7
#if CONFIG_RUNTIME_CPU_DETECT
if (cm->rtcd.flags & HAS_NEON)
#endif
{
vp8_yv12_copy_frame_yonly_no_extend_frame_borders_neon(&cpi->last_frame_uf, cm->frame_to_show);
}
#if CONFIG_RUNTIME_CPU_DETECT
else
#endif
#endif
#if !HAVE_ARMV7 || CONFIG_RUNTIME_CPU_DETECT
{
vp8_yv12_copy_frame_yonly_ptr(&cpi->last_frame_uf, cm->frame_to_show);
}
#endif
// 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;
}