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-rw-r--r--vp9/encoder/vp9_picklpf.c205
1 files changed, 205 insertions, 0 deletions
diff --git a/vp9/encoder/vp9_picklpf.c b/vp9/encoder/vp9_picklpf.c
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+++ b/vp9/encoder/vp9_picklpf.c
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+/*
+ * 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 <assert.h>
+#include <limits.h>
+#include "vp9/common/vp9_onyxc_int.h"
+#include "vp9/encoder/vp9_onyx_int.h"
+#include "vp9/encoder/vp9_picklpf.h"
+#include "vp9/encoder/vp9_quantize.h"
+#include "vpx_mem/vpx_mem.h"
+#include "vpx_scale/vpx_scale.h"
+#include "vp9/common/vp9_alloccommon.h"
+#include "vp9/common/vp9_loopfilter.h"
+#include "./vpx_scale_rtcd.h"
+
+void vp9_yv12_copy_partial_frame_c(YV12_BUFFER_CONFIG *src_ybc,
+ YV12_BUFFER_CONFIG *dst_ybc, int fraction) {
+ const int height = src_ybc->y_height;
+ const int stride = src_ybc->y_stride;
+ const int offset = stride * ((height >> 5) * 16 - 8);
+ const int lines_to_copy = MAX(height >> (fraction + 4), 1) << 4;
+
+ assert(src_ybc->y_stride == dst_ybc->y_stride);
+ vpx_memcpy(dst_ybc->y_buffer + offset, src_ybc->y_buffer + offset,
+ stride * (lines_to_copy + 16));
+}
+
+static int calc_partial_ssl_err(YV12_BUFFER_CONFIG *source,
+ YV12_BUFFER_CONFIG *dest, int Fraction) {
+ int i, j;
+ int Total = 0;
+ int srcoffset, dstoffset;
+ uint8_t *src = source->y_buffer;
+ uint8_t *dst = dest->y_buffer;
+
+ int linestocopy = (source->y_height >> (Fraction + 4));
+
+ 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 raw Y plane and reconstruction data summing the square
+ // differences.
+ for (i = 0; i < linestocopy; i += 16) {
+ for (j = 0; j < source->y_width; j += 16) {
+ unsigned int sse;
+ Total += vp9_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(VP9_COMP *cpi, int base_qindex) {
+ int min_filter_level;
+ min_filter_level = 0;
+
+ return min_filter_level;
+}
+
+// Enforce a maximum filter level based upon baseline Q
+static int get_max_filter_level(VP9_COMP *cpi, int base_qindex) {
+ 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;
+}
+
+
+// Stub function for now Alt LF not used
+void vp9_set_alt_lf_level(VP9_COMP *cpi, int filt_val) {
+}
+
+void vp9_pick_filter_level(YV12_BUFFER_CONFIG *sd, VP9_COMP *cpi, int partial) {
+ VP9_COMMON *const cm = &cpi->common;
+ struct loopfilter *const lf = &cm->lf;
+
+ int best_err = 0;
+ int filt_err = 0;
+ const int min_filter_level = get_min_filter_level(cpi, cm->base_qindex);
+ const int max_filter_level = get_max_filter_level(cpi, cm->base_qindex);
+
+ int filter_step;
+ int filt_high = 0;
+ // Start search at previous frame filter level
+ int filt_mid = lf->filter_level;
+ int filt_low = 0;
+ int filt_best;
+ int filt_direction = 0;
+
+ int Bias = 0; // Bias against raising loop filter in favor of lowering it.
+
+ // Make a copy of the unfiltered / processed recon buffer
+ vpx_yv12_copy_y(cm->frame_to_show, &cpi->last_frame_uf);
+
+ lf->sharpness_level = cm->frame_type == KEY_FRAME ? 0
+ : cpi->oxcf.Sharpness;
+
+ // Start the search at the previous frame filter level unless it is now out of
+ // range.
+ filt_mid = clamp(lf->filter_level, min_filter_level, max_filter_level);
+
+ // Define the initial step size
+ filter_step = filt_mid < 16 ? 4 : filt_mid / 4;
+
+ // Get baseline error score
+ vp9_set_alt_lf_level(cpi, filt_mid);
+ vp9_loop_filter_frame(cm, &cpi->mb.e_mbd, filt_mid, 1, partial);
+
+ best_err = vp9_calc_ss_err(sd, cm->frame_to_show);
+ filt_best = filt_mid;
+
+ // Re-instate the unfiltered frame
+ vpx_yv12_copy_y(&cpi->last_frame_uf, cm->frame_to_show);
+
+ 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;
+
+ // yx, bias less for large block size
+ if (cpi->common.tx_mode != ONLY_4X4)
+ Bias >>= 1;
+
+ 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
+ vp9_set_alt_lf_level(cpi, filt_low);
+ vp9_loop_filter_frame(cm, &cpi->mb.e_mbd, filt_low, 1, partial);
+
+ filt_err = vp9_calc_ss_err(sd, cm->frame_to_show);
+
+ // Re-instate the unfiltered frame
+ vpx_yv12_copy_y(&cpi->last_frame_uf, cm->frame_to_show);
+
+ // 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)) {
+ vp9_set_alt_lf_level(cpi, filt_high);
+ vp9_loop_filter_frame(cm, &cpi->mb.e_mbd, filt_high, 1, partial);
+
+ filt_err = vp9_calc_ss_err(sd, cm->frame_to_show);
+
+ // Re-instate the unfiltered frame
+ vpx_yv12_copy_y(&cpi->last_frame_uf, cm->frame_to_show);
+
+ // 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;
+ }
+ }
+
+ lf->filter_level = filt_best;
+}
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