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Diffstat (limited to 'media/libvpx/vp9/encoder/vp9_picklpf.c')
-rw-r--r--media/libvpx/vp9/encoder/vp9_picklpf.c192
1 files changed, 192 insertions, 0 deletions
diff --git a/media/libvpx/vp9/encoder/vp9_picklpf.c b/media/libvpx/vp9/encoder/vp9_picklpf.c
new file mode 100644
index 000000000..8e1910385
--- /dev/null
+++ b/media/libvpx/vp9/encoder/vp9_picklpf.c
@@ -0,0 +1,192 @@
+/*
+ * 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 "./vpx_scale_rtcd.h"
+
+#include "vpx_mem/vpx_mem.h"
+#include "vpx_ports/mem.h"
+
+#include "vp9/common/vp9_loopfilter.h"
+#include "vp9/common/vp9_onyxc_int.h"
+#include "vp9/common/vp9_quant_common.h"
+
+#include "vp9/encoder/vp9_encoder.h"
+#include "vp9/encoder/vp9_picklpf.h"
+#include "vp9/encoder/vp9_quantize.h"
+
+static int get_max_filter_level(const VP9_COMP *cpi) {
+ if (cpi->oxcf.pass == 2) {
+ return cpi->twopass.section_intra_rating > 8 ? MAX_LOOP_FILTER * 3 / 4
+ : MAX_LOOP_FILTER;
+ } else {
+ return MAX_LOOP_FILTER;
+ }
+}
+
+
+static int64_t try_filter_frame(const YV12_BUFFER_CONFIG *sd,
+ VP9_COMP *const cpi,
+ int filt_level, int partial_frame) {
+ VP9_COMMON *const cm = &cpi->common;
+ int64_t filt_err;
+
+ if (cpi->num_workers > 1)
+ vp9_loop_filter_frame_mt(cm->frame_to_show, cm, cpi->td.mb.e_mbd.plane,
+ filt_level, 1, partial_frame,
+ cpi->workers, cpi->num_workers, &cpi->lf_row_sync);
+ else
+ vp9_loop_filter_frame(cm->frame_to_show, cm, &cpi->td.mb.e_mbd, filt_level,
+ 1, partial_frame);
+
+#if CONFIG_VP9_HIGHBITDEPTH
+ if (cm->use_highbitdepth) {
+ filt_err = vp9_highbd_get_y_sse(sd, cm->frame_to_show);
+ } else {
+ filt_err = vp9_get_y_sse(sd, cm->frame_to_show);
+ }
+#else
+ filt_err = vp9_get_y_sse(sd, cm->frame_to_show);
+#endif // CONFIG_VP9_HIGHBITDEPTH
+
+ // Re-instate the unfiltered frame
+ vpx_yv12_copy_y(&cpi->last_frame_uf, cm->frame_to_show);
+
+ return filt_err;
+}
+
+static int search_filter_level(const YV12_BUFFER_CONFIG *sd, VP9_COMP *cpi,
+ int partial_frame) {
+ const VP9_COMMON *const cm = &cpi->common;
+ const struct loopfilter *const lf = &cm->lf;
+ const int min_filter_level = 0;
+ const int max_filter_level = get_max_filter_level(cpi);
+ int filt_direction = 0;
+ int64_t best_err;
+ int filt_best;
+
+ // Start the search at the previous frame filter level unless it is now out of
+ // range.
+ int filt_mid = clamp(lf->filter_level, min_filter_level, max_filter_level);
+ int filter_step = filt_mid < 16 ? 4 : filt_mid / 4;
+ // Sum squared error at each filter level
+ int64_t ss_err[MAX_LOOP_FILTER + 1];
+
+ // Set each entry to -1
+ memset(ss_err, 0xFF, sizeof(ss_err));
+
+ // Make a copy of the unfiltered / processed recon buffer
+ vpx_yv12_copy_y(cm->frame_to_show, &cpi->last_frame_uf);
+
+ best_err = try_filter_frame(sd, cpi, filt_mid, partial_frame);
+ filt_best = filt_mid;
+ ss_err[filt_mid] = best_err;
+
+ while (filter_step > 0) {
+ const int filt_high = MIN(filt_mid + filter_step, max_filter_level);
+ const int filt_low = MAX(filt_mid - filter_step, min_filter_level);
+
+ // Bias against raising loop filter in favor of lowering it.
+ int64_t bias = (best_err >> (15 - (filt_mid / 8))) * filter_step;
+
+ if ((cpi->oxcf.pass == 2) && (cpi->twopass.section_intra_rating < 20))
+ bias = (bias * cpi->twopass.section_intra_rating) / 20;
+
+ // yx, bias less for large block size
+ if (cm->tx_mode != ONLY_4X4)
+ bias >>= 1;
+
+ if (filt_direction <= 0 && filt_low != filt_mid) {
+ // Get Low filter error score
+ if (ss_err[filt_low] < 0) {
+ ss_err[filt_low] = try_filter_frame(sd, cpi, filt_low, partial_frame);
+ }
+ // If value is close to the best so far then bias towards a lower loop
+ // filter value.
+ if ((ss_err[filt_low] - bias) < best_err) {
+ // Was it actually better than the previous best?
+ if (ss_err[filt_low] < best_err)
+ best_err = ss_err[filt_low];
+
+ filt_best = filt_low;
+ }
+ }
+
+ // Now look at filt_high
+ if (filt_direction >= 0 && filt_high != filt_mid) {
+ if (ss_err[filt_high] < 0) {
+ ss_err[filt_high] = try_filter_frame(sd, cpi, filt_high, partial_frame);
+ }
+ // Was it better than the previous best?
+ if (ss_err[filt_high] < (best_err - bias)) {
+ best_err = ss_err[filt_high];
+ 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 /= 2;
+ filt_direction = 0;
+ } else {
+ filt_direction = (filt_best < filt_mid) ? -1 : 1;
+ filt_mid = filt_best;
+ }
+ }
+
+ return filt_best;
+}
+
+void vp9_pick_filter_level(const YV12_BUFFER_CONFIG *sd, VP9_COMP *cpi,
+ LPF_PICK_METHOD method) {
+ VP9_COMMON *const cm = &cpi->common;
+ struct loopfilter *const lf = &cm->lf;
+
+ lf->sharpness_level = cm->frame_type == KEY_FRAME ? 0
+ : cpi->oxcf.sharpness;
+
+ if (method == LPF_PICK_MINIMAL_LPF && lf->filter_level) {
+ lf->filter_level = 0;
+ } else if (method >= LPF_PICK_FROM_Q) {
+ const int min_filter_level = 0;
+ const int max_filter_level = get_max_filter_level(cpi);
+ const int q = vp9_ac_quant(cm->base_qindex, 0, cm->bit_depth);
+ // These values were determined by linear fitting the result of the
+ // searched level, filt_guess = q * 0.316206 + 3.87252
+#if CONFIG_VP9_HIGHBITDEPTH
+ int filt_guess;
+ switch (cm->bit_depth) {
+ case VPX_BITS_8:
+ filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 1015158, 18);
+ break;
+ case VPX_BITS_10:
+ filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 4060632, 20);
+ break;
+ case VPX_BITS_12:
+ filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 16242526, 22);
+ break;
+ default:
+ assert(0 && "bit_depth should be VPX_BITS_8, VPX_BITS_10 "
+ "or VPX_BITS_12");
+ return;
+ }
+#else
+ int filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 1015158, 18);
+#endif // CONFIG_VP9_HIGHBITDEPTH
+ if (cm->frame_type == KEY_FRAME)
+ filt_guess -= 4;
+ lf->filter_level = clamp(filt_guess, min_filter_level, max_filter_level);
+ } else {
+ lf->filter_level = search_filter_level(sd, cpi,
+ method == LPF_PICK_FROM_SUBIMAGE);
+ }
+}
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