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diff --git a/media/libvpx/vp9/encoder/vp9_denoiser.c b/media/libvpx/vp9/encoder/vp9_denoiser.c
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+/*
+ * 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.
+ */
+
+#include <assert.h>
+#include <limits.h>
+#include "vpx_scale/yv12config.h"
+#include "vpx/vpx_integer.h"
+#include "vp9/common/vp9_reconinter.h"
+#include "vp9/encoder/vp9_context_tree.h"
+#include "vp9/encoder/vp9_denoiser.h"
+
+/* The VP9 denoiser is a work-in-progress. It currently is only designed to work
+ * with speed 6, though it (inexplicably) seems to also work with speed 5 (one
+ * would need to modify the source code in vp9_pickmode.c and vp9_encoder.c to
+ * make the calls to the vp9_denoiser_* functions when in speed 5).
+ *
+ * The implementation is very similar to that of the VP8 denoiser. While
+ * choosing the motion vectors / reference frames, the denoiser is run, and if
+ * it did not modify the signal to much, the denoised block is copied to the
+ * signal.
+ */
+
+#ifdef OUTPUT_YUV_DENOISED
+static void make_grayscale(YV12_BUFFER_CONFIG *yuv);
+#endif
+
+static int absdiff_thresh(BLOCK_SIZE bs, int increase_denoising) {
+ (void)bs;
+ return 3 + (increase_denoising ? 1 : 0);
+}
+
+static int delta_thresh(BLOCK_SIZE bs, int increase_denoising) {
+ (void)bs;
+ (void)increase_denoising;
+ return 4;
+}
+
+static int noise_motion_thresh(BLOCK_SIZE bs, int increase_denoising) {
+ (void)bs;
+ (void)increase_denoising;
+ return 625;
+}
+
+static unsigned int sse_thresh(BLOCK_SIZE bs, int increase_denoising) {
+ return (1 << num_pels_log2_lookup[bs]) * (increase_denoising ? 60 : 40);
+}
+
+static int sse_diff_thresh(BLOCK_SIZE bs, int increase_denoising,
+ int motion_magnitude) {
+ if (motion_magnitude >
+ noise_motion_thresh(bs, increase_denoising)) {
+ return 0;
+ } else {
+ return (1 << num_pels_log2_lookup[bs]) * 20;
+ }
+}
+
+int total_adj_strong_thresh(BLOCK_SIZE bs, int increase_denoising) {
+ return (1 << num_pels_log2_lookup[bs]) * (increase_denoising ? 3 : 2);
+}
+
+static int total_adj_weak_thresh(BLOCK_SIZE bs, int increase_denoising) {
+ return (1 << num_pels_log2_lookup[bs]) * (increase_denoising ? 3 : 2);
+}
+
+// TODO(jackychen): If increase_denoising is enabled in the future,
+// we might need to update the code for calculating 'total_adj' in
+// case the C code is not bit-exact with corresponding sse2 code.
+int vp9_denoiser_filter_c(const uint8_t *sig, int sig_stride,
+ const uint8_t *mc_avg,
+ int mc_avg_stride,
+ uint8_t *avg, int avg_stride,
+ int increase_denoising,
+ BLOCK_SIZE bs,
+ int motion_magnitude) {
+ int r, c;
+ const uint8_t *sig_start = sig;
+ const uint8_t *mc_avg_start = mc_avg;
+ uint8_t *avg_start = avg;
+ int diff, adj, absdiff, delta;
+ int adj_val[] = {3, 4, 6};
+ int total_adj = 0;
+ int shift_inc = 1;
+
+ // If motion_magnitude is small, making the denoiser more aggressive by
+ // increasing the adjustment for each level. Add another increment for
+ // blocks that are labeled for increase denoising.
+ if (motion_magnitude <= MOTION_MAGNITUDE_THRESHOLD) {
+ if (increase_denoising) {
+ shift_inc = 2;
+ }
+ adj_val[0] += shift_inc;
+ adj_val[1] += shift_inc;
+ adj_val[2] += shift_inc;
+ }
+
+ // First attempt to apply a strong temporal denoising filter.
+ for (r = 0; r < (4 << b_height_log2_lookup[bs]); ++r) {
+ for (c = 0; c < (4 << b_width_log2_lookup[bs]); ++c) {
+ diff = mc_avg[c] - sig[c];
+ absdiff = abs(diff);
+
+ if (absdiff <= absdiff_thresh(bs, increase_denoising)) {
+ avg[c] = mc_avg[c];
+ total_adj += diff;
+ } else {
+ switch (absdiff) {
+ case 4: case 5: case 6: case 7:
+ adj = adj_val[0];
+ break;
+ case 8: case 9: case 10: case 11:
+ case 12: case 13: case 14: case 15:
+ adj = adj_val[1];
+ break;
+ default:
+ adj = adj_val[2];
+ }
+ if (diff > 0) {
+ avg[c] = MIN(UINT8_MAX, sig[c] + adj);
+ total_adj += adj;
+ } else {
+ avg[c] = MAX(0, sig[c] - adj);
+ total_adj -= adj;
+ }
+ }
+ }
+ sig += sig_stride;
+ avg += avg_stride;
+ mc_avg += mc_avg_stride;
+ }
+
+ // If the strong filter did not modify the signal too much, we're all set.
+ if (abs(total_adj) <= total_adj_strong_thresh(bs, increase_denoising)) {
+ return FILTER_BLOCK;
+ }
+
+ // Otherwise, we try to dampen the filter if the delta is not too high.
+ delta = ((abs(total_adj) - total_adj_strong_thresh(bs, increase_denoising))
+ >> num_pels_log2_lookup[bs]) + 1;
+
+ if (delta >= delta_thresh(bs, increase_denoising)) {
+ return COPY_BLOCK;
+ }
+
+ mc_avg = mc_avg_start;
+ avg = avg_start;
+ sig = sig_start;
+ for (r = 0; r < (4 << b_height_log2_lookup[bs]); ++r) {
+ for (c = 0; c < (4 << b_width_log2_lookup[bs]); ++c) {
+ diff = mc_avg[c] - sig[c];
+ adj = abs(diff);
+ if (adj > delta) {
+ adj = delta;
+ }
+ if (diff > 0) {
+ // Diff positive means we made positive adjustment above
+ // (in first try/attempt), so now make negative adjustment to bring
+ // denoised signal down.
+ avg[c] = MAX(0, avg[c] - adj);
+ total_adj -= adj;
+ } else {
+ // Diff negative means we made negative adjustment above
+ // (in first try/attempt), so now make positive adjustment to bring
+ // denoised signal up.
+ avg[c] = MIN(UINT8_MAX, avg[c] + adj);
+ total_adj += adj;
+ }
+ }
+ sig += sig_stride;
+ avg += avg_stride;
+ mc_avg += mc_avg_stride;
+ }
+
+ // We can use the filter if it has been sufficiently dampened
+ if (abs(total_adj) <= total_adj_weak_thresh(bs, increase_denoising)) {
+ return FILTER_BLOCK;
+ }
+ return COPY_BLOCK;
+}
+
+static uint8_t *block_start(uint8_t *framebuf, int stride,
+ int mi_row, int mi_col) {
+ return framebuf + (stride * mi_row * 8) + (mi_col * 8);
+}
+
+static VP9_DENOISER_DECISION perform_motion_compensation(VP9_DENOISER *denoiser,
+ MACROBLOCK *mb,
+ BLOCK_SIZE bs,
+ int increase_denoising,
+ int mi_row,
+ int mi_col,
+ PICK_MODE_CONTEXT *ctx,
+ int *motion_magnitude
+ ) {
+ int mv_col, mv_row;
+ int sse_diff = ctx->zeromv_sse - ctx->newmv_sse;
+ MV_REFERENCE_FRAME frame;
+ MACROBLOCKD *filter_mbd = &mb->e_mbd;
+ MB_MODE_INFO *mbmi = &filter_mbd->mi[0]->mbmi;
+ MB_MODE_INFO saved_mbmi;
+ int i, j;
+ struct buf_2d saved_dst[MAX_MB_PLANE];
+ struct buf_2d saved_pre[MAX_MB_PLANE][2]; // 2 pre buffers
+
+ mv_col = ctx->best_sse_mv.as_mv.col;
+ mv_row = ctx->best_sse_mv.as_mv.row;
+ *motion_magnitude = mv_row * mv_row + mv_col * mv_col;
+ frame = ctx->best_reference_frame;
+
+ saved_mbmi = *mbmi;
+
+ // If the best reference frame uses inter-prediction and there is enough of a
+ // difference in sum-squared-error, use it.
+ if (frame != INTRA_FRAME &&
+ sse_diff > sse_diff_thresh(bs, increase_denoising, *motion_magnitude)) {
+ mbmi->ref_frame[0] = ctx->best_reference_frame;
+ mbmi->mode = ctx->best_sse_inter_mode;
+ mbmi->mv[0] = ctx->best_sse_mv;
+ } else {
+ // Otherwise, use the zero reference frame.
+ frame = ctx->best_zeromv_reference_frame;
+
+ mbmi->ref_frame[0] = ctx->best_zeromv_reference_frame;
+ mbmi->mode = ZEROMV;
+ mbmi->mv[0].as_int = 0;
+
+ ctx->best_sse_inter_mode = ZEROMV;
+ ctx->best_sse_mv.as_int = 0;
+ ctx->newmv_sse = ctx->zeromv_sse;
+ }
+
+ if (ctx->newmv_sse > sse_thresh(bs, increase_denoising)) {
+ // Restore everything to its original state
+ *mbmi = saved_mbmi;
+ return COPY_BLOCK;
+ }
+ if (*motion_magnitude >
+ (noise_motion_thresh(bs, increase_denoising) << 3)) {
+ // Restore everything to its original state
+ *mbmi = saved_mbmi;
+ return COPY_BLOCK;
+ }
+
+ // We will restore these after motion compensation.
+ for (i = 0; i < MAX_MB_PLANE; ++i) {
+ for (j = 0; j < 2; ++j) {
+ saved_pre[i][j] = filter_mbd->plane[i].pre[j];
+ }
+ saved_dst[i] = filter_mbd->plane[i].dst;
+ }
+
+ // Set the pointers in the MACROBLOCKD to point to the buffers in the denoiser
+ // struct.
+ for (j = 0; j < 2; ++j) {
+ filter_mbd->plane[0].pre[j].buf =
+ block_start(denoiser->running_avg_y[frame].y_buffer,
+ denoiser->running_avg_y[frame].y_stride,
+ mi_row, mi_col);
+ filter_mbd->plane[0].pre[j].stride =
+ denoiser->running_avg_y[frame].y_stride;
+ filter_mbd->plane[1].pre[j].buf =
+ block_start(denoiser->running_avg_y[frame].u_buffer,
+ denoiser->running_avg_y[frame].uv_stride,
+ mi_row, mi_col);
+ filter_mbd->plane[1].pre[j].stride =
+ denoiser->running_avg_y[frame].uv_stride;
+ filter_mbd->plane[2].pre[j].buf =
+ block_start(denoiser->running_avg_y[frame].v_buffer,
+ denoiser->running_avg_y[frame].uv_stride,
+ mi_row, mi_col);
+ filter_mbd->plane[2].pre[j].stride =
+ denoiser->running_avg_y[frame].uv_stride;
+ }
+ filter_mbd->plane[0].dst.buf =
+ block_start(denoiser->mc_running_avg_y.y_buffer,
+ denoiser->mc_running_avg_y.y_stride,
+ mi_row, mi_col);
+ filter_mbd->plane[0].dst.stride = denoiser->mc_running_avg_y.y_stride;
+ filter_mbd->plane[1].dst.buf =
+ block_start(denoiser->mc_running_avg_y.u_buffer,
+ denoiser->mc_running_avg_y.uv_stride,
+ mi_row, mi_col);
+ filter_mbd->plane[1].dst.stride = denoiser->mc_running_avg_y.uv_stride;
+ filter_mbd->plane[2].dst.buf =
+ block_start(denoiser->mc_running_avg_y.v_buffer,
+ denoiser->mc_running_avg_y.uv_stride,
+ mi_row, mi_col);
+ filter_mbd->plane[2].dst.stride = denoiser->mc_running_avg_y.uv_stride;
+
+ vp9_build_inter_predictors_sby(filter_mbd, mv_row, mv_col, bs);
+
+ // Restore everything to its original state
+ *mbmi = saved_mbmi;
+ for (i = 0; i < MAX_MB_PLANE; ++i) {
+ for (j = 0; j < 2; ++j) {
+ filter_mbd->plane[i].pre[j] = saved_pre[i][j];
+ }
+ filter_mbd->plane[i].dst = saved_dst[i];
+ }
+
+ mv_row = ctx->best_sse_mv.as_mv.row;
+ mv_col = ctx->best_sse_mv.as_mv.col;
+
+ return FILTER_BLOCK;
+}
+
+void vp9_denoiser_denoise(VP9_DENOISER *denoiser, MACROBLOCK *mb,
+ int mi_row, int mi_col, BLOCK_SIZE bs,
+ PICK_MODE_CONTEXT *ctx) {
+ int motion_magnitude = 0;
+ VP9_DENOISER_DECISION decision = FILTER_BLOCK;
+ YV12_BUFFER_CONFIG avg = denoiser->running_avg_y[INTRA_FRAME];
+ YV12_BUFFER_CONFIG mc_avg = denoiser->mc_running_avg_y;
+ uint8_t *avg_start = block_start(avg.y_buffer, avg.y_stride, mi_row, mi_col);
+ uint8_t *mc_avg_start = block_start(mc_avg.y_buffer, mc_avg.y_stride,
+ mi_row, mi_col);
+ struct buf_2d src = mb->plane[0].src;
+
+ decision = perform_motion_compensation(denoiser, mb, bs,
+ denoiser->increase_denoising,
+ mi_row, mi_col, ctx,
+ &motion_magnitude);
+
+ if (decision == FILTER_BLOCK) {
+ decision = vp9_denoiser_filter(src.buf, src.stride,
+ mc_avg_start, mc_avg.y_stride,
+ avg_start, avg.y_stride,
+ 0, bs, motion_magnitude);
+ }
+
+ if (decision == FILTER_BLOCK) {
+ vp9_convolve_copy(avg_start, avg.y_stride, src.buf, src.stride,
+ NULL, 0, NULL, 0,
+ num_4x4_blocks_wide_lookup[bs] << 2,
+ num_4x4_blocks_high_lookup[bs] << 2);
+ } else { // COPY_BLOCK
+ vp9_convolve_copy(src.buf, src.stride, avg_start, avg.y_stride,
+ NULL, 0, NULL, 0,
+ num_4x4_blocks_wide_lookup[bs] << 2,
+ num_4x4_blocks_high_lookup[bs] << 2);
+ }
+}
+
+static void copy_frame(YV12_BUFFER_CONFIG dest, const YV12_BUFFER_CONFIG src) {
+ int r;
+ const uint8_t *srcbuf = src.y_buffer;
+ uint8_t *destbuf = dest.y_buffer;
+
+ assert(dest.y_width == src.y_width);
+ assert(dest.y_height == src.y_height);
+
+ for (r = 0; r < dest.y_height; ++r) {
+ memcpy(destbuf, srcbuf, dest.y_width);
+ destbuf += dest.y_stride;
+ srcbuf += src.y_stride;
+ }
+}
+
+static void swap_frame_buffer(YV12_BUFFER_CONFIG *dest,
+ YV12_BUFFER_CONFIG *src) {
+ uint8_t *tmp_buf = dest->y_buffer;
+ assert(dest->y_width == src->y_width);
+ assert(dest->y_height == src->y_height);
+ dest->y_buffer = src->y_buffer;
+ src->y_buffer = tmp_buf;
+}
+
+void vp9_denoiser_update_frame_info(VP9_DENOISER *denoiser,
+ YV12_BUFFER_CONFIG src,
+ FRAME_TYPE frame_type,
+ int refresh_alt_ref_frame,
+ int refresh_golden_frame,
+ int refresh_last_frame) {
+ if (frame_type == KEY_FRAME) {
+ int i;
+ // Start at 1 so as not to overwrite the INTRA_FRAME
+ for (i = 1; i < MAX_REF_FRAMES; ++i)
+ copy_frame(denoiser->running_avg_y[i], src);
+ return;
+ }
+
+ /* For non key frames */
+ if (refresh_alt_ref_frame) {
+ swap_frame_buffer(&denoiser->running_avg_y[ALTREF_FRAME],
+ &denoiser->running_avg_y[INTRA_FRAME]);
+ }
+ if (refresh_golden_frame) {
+ swap_frame_buffer(&denoiser->running_avg_y[GOLDEN_FRAME],
+ &denoiser->running_avg_y[INTRA_FRAME]);
+ }
+ if (refresh_last_frame) {
+ swap_frame_buffer(&denoiser->running_avg_y[LAST_FRAME],
+ &denoiser->running_avg_y[INTRA_FRAME]);
+ }
+}
+
+void vp9_denoiser_reset_frame_stats(PICK_MODE_CONTEXT *ctx) {
+ ctx->zeromv_sse = UINT_MAX;
+ ctx->newmv_sse = UINT_MAX;
+}
+
+void vp9_denoiser_update_frame_stats(MB_MODE_INFO *mbmi, unsigned int sse,
+ PREDICTION_MODE mode,
+ PICK_MODE_CONTEXT *ctx) {
+ // TODO(tkopp): Use both MVs if possible
+ if (mbmi->mv[0].as_int == 0 && sse < ctx->zeromv_sse) {
+ ctx->zeromv_sse = sse;
+ ctx->best_zeromv_reference_frame = mbmi->ref_frame[0];
+ }
+
+ if (mbmi->mv[0].as_int != 0 && sse < ctx->newmv_sse) {
+ ctx->newmv_sse = sse;
+ ctx->best_sse_inter_mode = mode;
+ ctx->best_sse_mv = mbmi->mv[0];
+ ctx->best_reference_frame = mbmi->ref_frame[0];
+ }
+}
+
+int vp9_denoiser_alloc(VP9_DENOISER *denoiser, int width, int height,
+ int ssx, int ssy,
+#if CONFIG_VP9_HIGHBITDEPTH
+ int use_highbitdepth,
+#endif
+ int border) {
+ int i, fail;
+ const int legacy_byte_alignment = 0;
+ assert(denoiser != NULL);
+
+ for (i = 0; i < MAX_REF_FRAMES; ++i) {
+ fail = vp9_alloc_frame_buffer(&denoiser->running_avg_y[i], width, height,
+ ssx, ssy,
+#if CONFIG_VP9_HIGHBITDEPTH
+ use_highbitdepth,
+#endif
+ border, legacy_byte_alignment);
+ if (fail) {
+ vp9_denoiser_free(denoiser);
+ return 1;
+ }
+#ifdef OUTPUT_YUV_DENOISED
+ make_grayscale(&denoiser->running_avg_y[i]);
+#endif
+ }
+
+ fail = vp9_alloc_frame_buffer(&denoiser->mc_running_avg_y, width, height,
+ ssx, ssy,
+#if CONFIG_VP9_HIGHBITDEPTH
+ use_highbitdepth,
+#endif
+ border, legacy_byte_alignment);
+ if (fail) {
+ vp9_denoiser_free(denoiser);
+ return 1;
+ }
+#ifdef OUTPUT_YUV_DENOISED
+ make_grayscale(&denoiser->running_avg_y[i]);
+#endif
+ denoiser->increase_denoising = 0;
+ denoiser->frame_buffer_initialized = 1;
+
+ return 0;
+}
+
+void vp9_denoiser_free(VP9_DENOISER *denoiser) {
+ int i;
+ denoiser->frame_buffer_initialized = 0;
+ if (denoiser == NULL) {
+ return;
+ }
+ for (i = 0; i < MAX_REF_FRAMES; ++i) {
+ vp9_free_frame_buffer(&denoiser->running_avg_y[i]);
+ }
+ vp9_free_frame_buffer(&denoiser->mc_running_avg_y);
+}
+
+#ifdef OUTPUT_YUV_DENOISED
+static void make_grayscale(YV12_BUFFER_CONFIG *yuv) {
+ int r, c;
+ uint8_t *u = yuv->u_buffer;
+ uint8_t *v = yuv->v_buffer;
+
+ for (r = 0; r < yuv->uv_height; ++r) {
+ for (c = 0; c < yuv->uv_width; ++c) {
+ u[c] = UINT8_MAX / 2;
+ v[c] = UINT8_MAX / 2;
+ }
+ u += yuv->uv_stride;
+ v += yuv->uv_stride;
+ }
+}
+#endif
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