diff options
Diffstat (limited to 'media/libvpx/libvpx/vp9/encoder/arm/neon/vp9_denoiser_neon.c')
| -rw-r--r-- | media/libvpx/libvpx/vp9/encoder/arm/neon/vp9_denoiser_neon.c | 356 |
1 files changed, 356 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vp9/encoder/arm/neon/vp9_denoiser_neon.c b/media/libvpx/libvpx/vp9/encoder/arm/neon/vp9_denoiser_neon.c new file mode 100644 index 0000000000..d631cd437d --- /dev/null +++ b/media/libvpx/libvpx/vp9/encoder/arm/neon/vp9_denoiser_neon.c @@ -0,0 +1,356 @@ +/* + * Copyright (c) 2017 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 <arm_neon.h> + +#include "./vpx_config.h" +#include "./vp9_rtcd.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" +#include "vpx_mem/vpx_mem.h" + +// Compute the sum of all pixel differences of this MB. +static INLINE int horizontal_add_s8x16(const int8x16_t v_sum_diff_total) { +#if VPX_ARCH_AARCH64 + return vaddlvq_s8(v_sum_diff_total); +#else + const int16x8_t fe_dc_ba_98_76_54_32_10 = vpaddlq_s8(v_sum_diff_total); + const int32x4_t fedc_ba98_7654_3210 = vpaddlq_s16(fe_dc_ba_98_76_54_32_10); + const int64x2_t fedcba98_76543210 = vpaddlq_s32(fedc_ba98_7654_3210); + const int64x1_t x = vqadd_s64(vget_high_s64(fedcba98_76543210), + vget_low_s64(fedcba98_76543210)); + const int sum_diff = vget_lane_s32(vreinterpret_s32_s64(x), 0); + return sum_diff; +#endif +} + +// Denoise a 16x1 vector. +static INLINE int8x16_t denoiser_16x1_neon( + const uint8_t *sig, const uint8_t *mc_running_avg_y, uint8_t *running_avg_y, + const uint8x16_t v_level1_threshold, const uint8x16_t v_level2_threshold, + const uint8x16_t v_level3_threshold, const uint8x16_t v_level1_adjustment, + const uint8x16_t v_delta_level_1_and_2, + const uint8x16_t v_delta_level_2_and_3, int8x16_t v_sum_diff_total) { + const uint8x16_t v_sig = vld1q_u8(sig); + const uint8x16_t v_mc_running_avg_y = vld1q_u8(mc_running_avg_y); + + /* Calculate absolute difference and sign masks. */ + const uint8x16_t v_abs_diff = vabdq_u8(v_sig, v_mc_running_avg_y); + const uint8x16_t v_diff_pos_mask = vcltq_u8(v_sig, v_mc_running_avg_y); + const uint8x16_t v_diff_neg_mask = vcgtq_u8(v_sig, v_mc_running_avg_y); + + /* Figure out which level that put us in. */ + const uint8x16_t v_level1_mask = vcleq_u8(v_level1_threshold, v_abs_diff); + const uint8x16_t v_level2_mask = vcleq_u8(v_level2_threshold, v_abs_diff); + const uint8x16_t v_level3_mask = vcleq_u8(v_level3_threshold, v_abs_diff); + + /* Calculate absolute adjustments for level 1, 2 and 3. */ + const uint8x16_t v_level2_adjustment = + vandq_u8(v_level2_mask, v_delta_level_1_and_2); + const uint8x16_t v_level3_adjustment = + vandq_u8(v_level3_mask, v_delta_level_2_and_3); + const uint8x16_t v_level1and2_adjustment = + vaddq_u8(v_level1_adjustment, v_level2_adjustment); + const uint8x16_t v_level1and2and3_adjustment = + vaddq_u8(v_level1and2_adjustment, v_level3_adjustment); + + /* Figure adjustment absolute value by selecting between the absolute + * difference if in level0 or the value for level 1, 2 and 3. + */ + const uint8x16_t v_abs_adjustment = + vbslq_u8(v_level1_mask, v_level1and2and3_adjustment, v_abs_diff); + + /* Calculate positive and negative adjustments. Apply them to the signal + * and accumulate them. Adjustments are less than eight and the maximum + * sum of them (7 * 16) can fit in a signed char. + */ + const uint8x16_t v_pos_adjustment = + vandq_u8(v_diff_pos_mask, v_abs_adjustment); + const uint8x16_t v_neg_adjustment = + vandq_u8(v_diff_neg_mask, v_abs_adjustment); + + uint8x16_t v_running_avg_y = vqaddq_u8(v_sig, v_pos_adjustment); + v_running_avg_y = vqsubq_u8(v_running_avg_y, v_neg_adjustment); + + /* Store results. */ + vst1q_u8(running_avg_y, v_running_avg_y); + + /* Sum all the accumulators to have the sum of all pixel differences + * for this macroblock. + */ + { + const int8x16_t v_sum_diff = + vqsubq_s8(vreinterpretq_s8_u8(v_pos_adjustment), + vreinterpretq_s8_u8(v_neg_adjustment)); + v_sum_diff_total = vaddq_s8(v_sum_diff_total, v_sum_diff); + } + return v_sum_diff_total; +} + +static INLINE int8x16_t denoiser_adjust_16x1_neon( + const uint8_t *sig, const uint8_t *mc_running_avg_y, uint8_t *running_avg_y, + const uint8x16_t k_delta, int8x16_t v_sum_diff_total) { + uint8x16_t v_running_avg_y = vld1q_u8(running_avg_y); + const uint8x16_t v_sig = vld1q_u8(sig); + const uint8x16_t v_mc_running_avg_y = vld1q_u8(mc_running_avg_y); + + /* Calculate absolute difference and sign masks. */ + const uint8x16_t v_abs_diff = vabdq_u8(v_sig, v_mc_running_avg_y); + const uint8x16_t v_diff_pos_mask = vcltq_u8(v_sig, v_mc_running_avg_y); + const uint8x16_t v_diff_neg_mask = vcgtq_u8(v_sig, v_mc_running_avg_y); + // Clamp absolute difference to delta to get the adjustment. + const uint8x16_t v_abs_adjustment = vminq_u8(v_abs_diff, (k_delta)); + + const uint8x16_t v_pos_adjustment = + vandq_u8(v_diff_pos_mask, v_abs_adjustment); + const uint8x16_t v_neg_adjustment = + vandq_u8(v_diff_neg_mask, v_abs_adjustment); + + v_running_avg_y = vqsubq_u8(v_running_avg_y, v_pos_adjustment); + v_running_avg_y = vqaddq_u8(v_running_avg_y, v_neg_adjustment); + + /* Store results. */ + vst1q_u8(running_avg_y, v_running_avg_y); + + { + const int8x16_t v_sum_diff = + vqsubq_s8(vreinterpretq_s8_u8(v_neg_adjustment), + vreinterpretq_s8_u8(v_pos_adjustment)); + v_sum_diff_total = vaddq_s8(v_sum_diff_total, v_sum_diff); + } + return v_sum_diff_total; +} + +// Denoise 8x8 and 8x16 blocks. +static int vp9_denoiser_8xN_neon(const uint8_t *sig, int sig_stride, + const uint8_t *mc_running_avg_y, + int mc_avg_y_stride, uint8_t *running_avg_y, + int avg_y_stride, int increase_denoising, + BLOCK_SIZE bs, int motion_magnitude, + int width) { + int sum_diff_thresh, r, sum_diff = 0; + const int shift_inc = + (increase_denoising && motion_magnitude <= MOTION_MAGNITUDE_THRESHOLD) + ? 1 + : 0; + uint8_t sig_buffer[8][16], mc_running_buffer[8][16], running_buffer[8][16]; + + const uint8x16_t v_level1_adjustment = vmovq_n_u8( + (motion_magnitude <= MOTION_MAGNITUDE_THRESHOLD) ? 4 + shift_inc : 3); + const uint8x16_t v_delta_level_1_and_2 = vdupq_n_u8(1); + const uint8x16_t v_delta_level_2_and_3 = vdupq_n_u8(2); + const uint8x16_t v_level1_threshold = vdupq_n_u8(4 + shift_inc); + const uint8x16_t v_level2_threshold = vdupq_n_u8(8); + const uint8x16_t v_level3_threshold = vdupq_n_u8(16); + + const int b_height = (4 << b_height_log2_lookup[bs]) >> 1; + + int8x16_t v_sum_diff_total = vdupq_n_s8(0); + + for (r = 0; r < b_height; ++r) { + memcpy(sig_buffer[r], sig, width); + memcpy(sig_buffer[r] + width, sig + sig_stride, width); + memcpy(mc_running_buffer[r], mc_running_avg_y, width); + memcpy(mc_running_buffer[r] + width, mc_running_avg_y + mc_avg_y_stride, + width); + memcpy(running_buffer[r], running_avg_y, width); + memcpy(running_buffer[r] + width, running_avg_y + avg_y_stride, width); + v_sum_diff_total = denoiser_16x1_neon( + sig_buffer[r], mc_running_buffer[r], running_buffer[r], + v_level1_threshold, v_level2_threshold, v_level3_threshold, + v_level1_adjustment, v_delta_level_1_and_2, v_delta_level_2_and_3, + v_sum_diff_total); + { + const uint8x16_t v_running_buffer = vld1q_u8(running_buffer[r]); + const uint8x8_t v_running_buffer_high = vget_high_u8(v_running_buffer); + const uint8x8_t v_running_buffer_low = vget_low_u8(v_running_buffer); + vst1_u8(running_avg_y, v_running_buffer_low); + vst1_u8(running_avg_y + avg_y_stride, v_running_buffer_high); + } + // Update pointers for next iteration. + sig += (sig_stride << 1); + mc_running_avg_y += (mc_avg_y_stride << 1); + running_avg_y += (avg_y_stride << 1); + } + + { + sum_diff = horizontal_add_s8x16(v_sum_diff_total); + sum_diff_thresh = total_adj_strong_thresh(bs, increase_denoising); + if (abs(sum_diff) > sum_diff_thresh) { + // Before returning to copy the block (i.e., apply no denoising), + // check if we can still apply some (weaker) temporal filtering to + // this block, that would otherwise not be denoised at all. Simplest + // is to apply an additional adjustment to running_avg_y to bring it + // closer to sig. The adjustment is capped by a maximum delta, and + // chosen such that in most cases the resulting sum_diff will be + // within the acceptable range given by sum_diff_thresh. + + // The delta is set by the excess of absolute pixel diff over the + // threshold. + const int delta = + ((abs(sum_diff) - sum_diff_thresh) >> num_pels_log2_lookup[bs]) + 1; + // Only apply the adjustment for max delta up to 3. + if (delta < 4) { + const uint8x16_t k_delta = vmovq_n_u8(delta); + running_avg_y -= avg_y_stride * (b_height << 1); + for (r = 0; r < b_height; ++r) { + v_sum_diff_total = denoiser_adjust_16x1_neon( + sig_buffer[r], mc_running_buffer[r], running_buffer[r], k_delta, + v_sum_diff_total); + { + const uint8x16_t v_running_buffer = vld1q_u8(running_buffer[r]); + const uint8x8_t v_running_buffer_high = + vget_high_u8(v_running_buffer); + const uint8x8_t v_running_buffer_low = + vget_low_u8(v_running_buffer); + vst1_u8(running_avg_y, v_running_buffer_low); + vst1_u8(running_avg_y + avg_y_stride, v_running_buffer_high); + } + // Update pointers for next iteration. + running_avg_y += (avg_y_stride << 1); + } + sum_diff = horizontal_add_s8x16(v_sum_diff_total); + if (abs(sum_diff) > sum_diff_thresh) { + return COPY_BLOCK; + } + } else { + return COPY_BLOCK; + } + } + } + + return FILTER_BLOCK; +} + +// Denoise 16x16, 16x32, 32x16, 32x32, 32x64, 64x32 and 64x64 blocks. +static int vp9_denoiser_NxM_neon(const uint8_t *sig, int sig_stride, + const uint8_t *mc_running_avg_y, + int mc_avg_y_stride, uint8_t *running_avg_y, + int avg_y_stride, int increase_denoising, + BLOCK_SIZE bs, int motion_magnitude) { + const int shift_inc = + (increase_denoising && motion_magnitude <= MOTION_MAGNITUDE_THRESHOLD) + ? 1 + : 0; + const uint8x16_t v_level1_adjustment = vmovq_n_u8( + (motion_magnitude <= MOTION_MAGNITUDE_THRESHOLD) ? 4 + shift_inc : 3); + const uint8x16_t v_delta_level_1_and_2 = vdupq_n_u8(1); + const uint8x16_t v_delta_level_2_and_3 = vdupq_n_u8(2); + const uint8x16_t v_level1_threshold = vmovq_n_u8(4 + shift_inc); + const uint8x16_t v_level2_threshold = vdupq_n_u8(8); + const uint8x16_t v_level3_threshold = vdupq_n_u8(16); + + const int b_width = (4 << b_width_log2_lookup[bs]); + const int b_height = (4 << b_height_log2_lookup[bs]); + const int b_width_shift4 = b_width >> 4; + + int8x16_t v_sum_diff_total[4][4]; + int r, c, sum_diff = 0; + + for (r = 0; r < 4; ++r) { + for (c = 0; c < b_width_shift4; ++c) { + v_sum_diff_total[c][r] = vdupq_n_s8(0); + } + } + + for (r = 0; r < b_height; ++r) { + for (c = 0; c < b_width_shift4; ++c) { + v_sum_diff_total[c][r >> 4] = denoiser_16x1_neon( + sig, mc_running_avg_y, running_avg_y, v_level1_threshold, + v_level2_threshold, v_level3_threshold, v_level1_adjustment, + v_delta_level_1_and_2, v_delta_level_2_and_3, + v_sum_diff_total[c][r >> 4]); + + // Update pointers for next iteration. + sig += 16; + mc_running_avg_y += 16; + running_avg_y += 16; + } + + if ((r & 0xf) == 0xf || (bs == BLOCK_16X8 && r == 7)) { + for (c = 0; c < b_width_shift4; ++c) { + sum_diff += horizontal_add_s8x16(v_sum_diff_total[c][r >> 4]); + } + } + + // Update pointers for next iteration. + sig = sig - b_width + sig_stride; + mc_running_avg_y = mc_running_avg_y - b_width + mc_avg_y_stride; + running_avg_y = running_avg_y - b_width + avg_y_stride; + } + + { + const int sum_diff_thresh = total_adj_strong_thresh(bs, increase_denoising); + if (abs(sum_diff) > sum_diff_thresh) { + const int delta = + ((abs(sum_diff) - sum_diff_thresh) >> num_pels_log2_lookup[bs]) + 1; + // Only apply the adjustment for max delta up to 3. + if (delta < 4) { + const uint8x16_t k_delta = vdupq_n_u8(delta); + sig -= sig_stride * b_height; + mc_running_avg_y -= mc_avg_y_stride * b_height; + running_avg_y -= avg_y_stride * b_height; + sum_diff = 0; + + for (r = 0; r < b_height; ++r) { + for (c = 0; c < b_width_shift4; ++c) { + v_sum_diff_total[c][r >> 4] = + denoiser_adjust_16x1_neon(sig, mc_running_avg_y, running_avg_y, + k_delta, v_sum_diff_total[c][r >> 4]); + + // Update pointers for next iteration. + sig += 16; + mc_running_avg_y += 16; + running_avg_y += 16; + } + if ((r & 0xf) == 0xf || (bs == BLOCK_16X8 && r == 7)) { + for (c = 0; c < b_width_shift4; ++c) { + sum_diff += horizontal_add_s8x16(v_sum_diff_total[c][r >> 4]); + } + } + + sig = sig - b_width + sig_stride; + mc_running_avg_y = mc_running_avg_y - b_width + mc_avg_y_stride; + running_avg_y = running_avg_y - b_width + avg_y_stride; + } + + if (abs(sum_diff) > sum_diff_thresh) { + return COPY_BLOCK; + } + } else { + return COPY_BLOCK; + } + } + } + return FILTER_BLOCK; +} + +int vp9_denoiser_filter_neon(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) { + // Rank by frequency of the block type to have an early termination. + if (bs == BLOCK_16X16 || bs == BLOCK_32X32 || bs == BLOCK_64X64 || + bs == BLOCK_16X32 || bs == BLOCK_16X8 || bs == BLOCK_32X16 || + bs == BLOCK_32X64 || bs == BLOCK_64X32) { + return vp9_denoiser_NxM_neon(sig, sig_stride, mc_avg, mc_avg_stride, avg, + avg_stride, increase_denoising, bs, + motion_magnitude); + } else if (bs == BLOCK_8X8 || bs == BLOCK_8X16) { + return vp9_denoiser_8xN_neon(sig, sig_stride, mc_avg, mc_avg_stride, avg, + avg_stride, increase_denoising, bs, + motion_magnitude, 8); + } + return COPY_BLOCK; +} |