ref: 7877b911a425ad7e1c829d86eeac0c334f19de39
dir: /vpx_dsp/arm/deblock_neon.c/
/* * Copyright (c) 2016 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 <assert.h> #include "./vpx_dsp_rtcd.h" #include "vpx/vpx_integer.h" #include "vpx_dsp/arm/transpose_neon.h" extern const int16_t vpx_rv[]; static uint8x8_t average_k_out(const uint8x8_t a2, const uint8x8_t a1, const uint8x8_t v0, const uint8x8_t b1, const uint8x8_t b2) { const uint8x8_t k1 = vrhadd_u8(a2, a1); const uint8x8_t k2 = vrhadd_u8(b2, b1); const uint8x8_t k3 = vrhadd_u8(k1, k2); return vrhadd_u8(k3, v0); } static uint8x8_t generate_mask(const uint8x8_t a2, const uint8x8_t a1, const uint8x8_t v0, const uint8x8_t b1, const uint8x8_t b2, const uint8x8_t filter) { const uint8x8_t a2_v0 = vabd_u8(a2, v0); const uint8x8_t a1_v0 = vabd_u8(a1, v0); const uint8x8_t b1_v0 = vabd_u8(b1, v0); const uint8x8_t b2_v0 = vabd_u8(b2, v0); uint8x8_t max = vmax_u8(a2_v0, a1_v0); max = vmax_u8(b1_v0, max); max = vmax_u8(b2_v0, max); return vclt_u8(max, filter); } static uint8x8_t generate_output(const uint8x8_t a2, const uint8x8_t a1, const uint8x8_t v0, const uint8x8_t b1, const uint8x8_t b2, const uint8x8_t filter) { const uint8x8_t k_out = average_k_out(a2, a1, v0, b1, b2); const uint8x8_t mask = generate_mask(a2, a1, v0, b1, b2, filter); return vbsl_u8(mask, k_out, v0); } // Same functions but for uint8x16_t. static uint8x16_t average_k_outq(const uint8x16_t a2, const uint8x16_t a1, const uint8x16_t v0, const uint8x16_t b1, const uint8x16_t b2) { const uint8x16_t k1 = vrhaddq_u8(a2, a1); const uint8x16_t k2 = vrhaddq_u8(b2, b1); const uint8x16_t k3 = vrhaddq_u8(k1, k2); return vrhaddq_u8(k3, v0); } static uint8x16_t generate_maskq(const uint8x16_t a2, const uint8x16_t a1, const uint8x16_t v0, const uint8x16_t b1, const uint8x16_t b2, const uint8x16_t filter) { const uint8x16_t a2_v0 = vabdq_u8(a2, v0); const uint8x16_t a1_v0 = vabdq_u8(a1, v0); const uint8x16_t b1_v0 = vabdq_u8(b1, v0); const uint8x16_t b2_v0 = vabdq_u8(b2, v0); uint8x16_t max = vmaxq_u8(a2_v0, a1_v0); max = vmaxq_u8(b1_v0, max); max = vmaxq_u8(b2_v0, max); return vcltq_u8(max, filter); } static uint8x16_t generate_outputq(const uint8x16_t a2, const uint8x16_t a1, const uint8x16_t v0, const uint8x16_t b1, const uint8x16_t b2, const uint8x16_t filter) { const uint8x16_t k_out = average_k_outq(a2, a1, v0, b1, b2); const uint8x16_t mask = generate_maskq(a2, a1, v0, b1, b2, filter); return vbslq_u8(mask, k_out, v0); } void vpx_post_proc_down_and_across_mb_row_neon(uint8_t *src_ptr, uint8_t *dst_ptr, int src_stride, int dst_stride, int cols, uint8_t *f, int size) { uint8_t *src, *dst; int row; int col; // While columns of length 16 can be processed, load them. for (col = 0; col < cols - 8; col += 16) { uint8x16_t a0, a1, a2, a3, a4, a5, a6, a7; src = src_ptr - 2 * src_stride; dst = dst_ptr; a0 = vld1q_u8(src); src += src_stride; a1 = vld1q_u8(src); src += src_stride; a2 = vld1q_u8(src); src += src_stride; a3 = vld1q_u8(src); src += src_stride; for (row = 0; row < size; row += 4) { uint8x16_t v_out_0, v_out_1, v_out_2, v_out_3; const uint8x16_t filterq = vld1q_u8(f + col); a4 = vld1q_u8(src); src += src_stride; a5 = vld1q_u8(src); src += src_stride; a6 = vld1q_u8(src); src += src_stride; a7 = vld1q_u8(src); src += src_stride; v_out_0 = generate_outputq(a0, a1, a2, a3, a4, filterq); v_out_1 = generate_outputq(a1, a2, a3, a4, a5, filterq); v_out_2 = generate_outputq(a2, a3, a4, a5, a6, filterq); v_out_3 = generate_outputq(a3, a4, a5, a6, a7, filterq); vst1q_u8(dst, v_out_0); dst += dst_stride; vst1q_u8(dst, v_out_1); dst += dst_stride; vst1q_u8(dst, v_out_2); dst += dst_stride; vst1q_u8(dst, v_out_3); dst += dst_stride; // Rotate over to the next slot. a0 = a4; a1 = a5; a2 = a6; a3 = a7; } src_ptr += 16; dst_ptr += 16; } // Clean up any left over column of length 8. if (col != cols) { uint8x8_t a0, a1, a2, a3, a4, a5, a6, a7; src = src_ptr - 2 * src_stride; dst = dst_ptr; a0 = vld1_u8(src); src += src_stride; a1 = vld1_u8(src); src += src_stride; a2 = vld1_u8(src); src += src_stride; a3 = vld1_u8(src); src += src_stride; for (row = 0; row < size; row += 4) { uint8x8_t v_out_0, v_out_1, v_out_2, v_out_3; const uint8x8_t filter = vld1_u8(f + col); a4 = vld1_u8(src); src += src_stride; a5 = vld1_u8(src); src += src_stride; a6 = vld1_u8(src); src += src_stride; a7 = vld1_u8(src); src += src_stride; v_out_0 = generate_output(a0, a1, a2, a3, a4, filter); v_out_1 = generate_output(a1, a2, a3, a4, a5, filter); v_out_2 = generate_output(a2, a3, a4, a5, a6, filter); v_out_3 = generate_output(a3, a4, a5, a6, a7, filter); vst1_u8(dst, v_out_0); dst += dst_stride; vst1_u8(dst, v_out_1); dst += dst_stride; vst1_u8(dst, v_out_2); dst += dst_stride; vst1_u8(dst, v_out_3); dst += dst_stride; // Rotate over to the next slot. a0 = a4; a1 = a5; a2 = a6; a3 = a7; } // Not strictly necessary but makes resetting dst_ptr easier. dst_ptr += 8; } dst_ptr -= cols; for (row = 0; row < size; row += 8) { uint8x8_t a0, a1, a2, a3; uint8x8_t b0, b1, b2, b3, b4, b5, b6, b7; src = dst_ptr; dst = dst_ptr; // Load 8 values, transpose 4 of them, and discard 2 because they will be // reloaded later. load_and_transpose_u8_4x8(src, dst_stride, &a0, &a1, &a2, &a3); a3 = a1; a2 = a1 = a0; // Extend left border. src += 2; for (col = 0; col < cols; col += 8) { uint8x8_t v_out_0, v_out_1, v_out_2, v_out_3, v_out_4, v_out_5, v_out_6, v_out_7; // Although the filter is meant to be applied vertically and is instead // being applied horizontally here it's OK because it's set in blocks of 8 // (or 16). const uint8x8_t filter = vld1_u8(f + col); load_and_transpose_u8_8x8(src, dst_stride, &b0, &b1, &b2, &b3, &b4, &b5, &b6, &b7); if (col + 8 == cols) { // Last row. Extend border (b5). b6 = b7 = b5; } v_out_0 = generate_output(a0, a1, a2, a3, b0, filter); v_out_1 = generate_output(a1, a2, a3, b0, b1, filter); v_out_2 = generate_output(a2, a3, b0, b1, b2, filter); v_out_3 = generate_output(a3, b0, b1, b2, b3, filter); v_out_4 = generate_output(b0, b1, b2, b3, b4, filter); v_out_5 = generate_output(b1, b2, b3, b4, b5, filter); v_out_6 = generate_output(b2, b3, b4, b5, b6, filter); v_out_7 = generate_output(b3, b4, b5, b6, b7, filter); transpose_and_store_u8_8x8(dst, dst_stride, v_out_0, v_out_1, v_out_2, v_out_3, v_out_4, v_out_5, v_out_6, v_out_7); a0 = b4; a1 = b5; a2 = b6; a3 = b7; src += 8; dst += 8; } dst_ptr += 8 * dst_stride; } } // sum += x; // sumsq += x * y; static void accumulate_sum_sumsq(const int16x4_t x, const int32x4_t xy, int16x4_t *const sum, int32x4_t *const sumsq) { const int16x4_t zero = vdup_n_s16(0); const int32x4_t zeroq = vdupq_n_s32(0); // Add in the first set because vext doesn't work with '0'. *sum = vadd_s16(*sum, x); *sumsq = vaddq_s32(*sumsq, xy); // Shift x and xy to the right and sum. vext requires an immediate. *sum = vadd_s16(*sum, vext_s16(zero, x, 1)); *sumsq = vaddq_s32(*sumsq, vextq_s32(zeroq, xy, 1)); *sum = vadd_s16(*sum, vext_s16(zero, x, 2)); *sumsq = vaddq_s32(*sumsq, vextq_s32(zeroq, xy, 2)); *sum = vadd_s16(*sum, vext_s16(zero, x, 3)); *sumsq = vaddq_s32(*sumsq, vextq_s32(zeroq, xy, 3)); } // Generate mask based on (sumsq * 15 - sum * sum < flimit) static uint16x4_t calculate_mask(const int16x4_t sum, const int32x4_t sumsq, const int32x4_t f, const int32x4_t fifteen) { const int32x4_t a = vmulq_s32(sumsq, fifteen); const int32x4_t b = vmlsl_s16(a, sum, sum); const uint32x4_t mask32 = vcltq_s32(b, f); return vmovn_u32(mask32); } static uint8x8_t combine_mask(const int16x4_t sum_low, const int16x4_t sum_high, const int32x4_t sumsq_low, const int32x4_t sumsq_high, const int32x4_t f) { const int32x4_t fifteen = vdupq_n_s32(15); const uint16x4_t mask16_low = calculate_mask(sum_low, sumsq_low, f, fifteen); const uint16x4_t mask16_high = calculate_mask(sum_high, sumsq_high, f, fifteen); return vmovn_u16(vcombine_u16(mask16_low, mask16_high)); } // Apply filter of (8 + sum + s[c]) >> 4. static uint8x8_t filter_pixels(const int16x8_t sum, const uint8x8_t s) { const int16x8_t s16 = vreinterpretq_s16_u16(vmovl_u8(s)); const int16x8_t sum_s = vaddq_s16(sum, s16); return vqrshrun_n_s16(sum_s, 4); } void vpx_mbpost_proc_across_ip_neon(uint8_t *src, int pitch, int rows, int cols, int flimit) { int row, col; const int32x4_t f = vdupq_n_s32(flimit); assert(cols % 8 == 0); for (row = 0; row < rows; ++row) { // Sum the first 8 elements, which are extended from s[0]. // sumsq gets primed with +16. int sumsq = src[0] * src[0] * 9 + 16; int sum = src[0] * 9; uint8x8_t left_context, s, right_context; int16x4_t sum_low, sum_high; int32x4_t sumsq_low, sumsq_high; // Sum (+square) the next 6 elements. // Skip [0] because it's included above. for (col = 1; col <= 6; ++col) { sumsq += src[col] * src[col]; sum += src[col]; } // Prime the sums. Later the loop uses the _high values to prime the new // vectors. sumsq_high = vdupq_n_s32(sumsq); sum_high = vdup_n_s16(sum); // Manually extend the left border. left_context = vdup_n_u8(src[0]); for (col = 0; col < cols; col += 8) { uint8x8_t mask, output; int16x8_t x, y; int32x4_t xy_low, xy_high; s = vld1_u8(src + col); if (col + 8 == cols) { // Last row. Extend border. right_context = vdup_n_u8(src[col + 7]); } else { right_context = vld1_u8(src + col + 7); } x = vreinterpretq_s16_u16(vsubl_u8(right_context, left_context)); y = vreinterpretq_s16_u16(vaddl_u8(right_context, left_context)); xy_low = vmull_s16(vget_low_s16(x), vget_low_s16(y)); xy_high = vmull_s16(vget_high_s16(x), vget_high_s16(y)); // Catch up to the last sum'd value. sum_low = vdup_lane_s16(sum_high, 3); sumsq_low = vdupq_lane_s32(vget_high_s32(sumsq_high), 1); accumulate_sum_sumsq(vget_low_s16(x), xy_low, &sum_low, &sumsq_low); // Need to do this sequentially because we need the max value from // sum_low. sum_high = vdup_lane_s16(sum_low, 3); sumsq_high = vdupq_lane_s32(vget_high_s32(sumsq_low), 1); accumulate_sum_sumsq(vget_high_s16(x), xy_high, &sum_high, &sumsq_high); mask = combine_mask(sum_low, sum_high, sumsq_low, sumsq_high, f); output = filter_pixels(vcombine_s16(sum_low, sum_high), s); output = vbsl_u8(mask, output, s); vst1_u8(src + col, output); left_context = s; } src += pitch; } } // Apply filter of (vpx_rv + sum + s[c]) >> 4. static uint8x8_t filter_pixels_rv(const int16x8_t sum, const uint8x8_t s, const int16x8_t rv) { const int16x8_t s16 = vreinterpretq_s16_u16(vmovl_u8(s)); const int16x8_t sum_s = vaddq_s16(sum, s16); const int16x8_t rounded = vaddq_s16(sum_s, rv); return vqshrun_n_s16(rounded, 4); } void vpx_mbpost_proc_down_neon(uint8_t *dst, int pitch, int rows, int cols, int flimit) { int row, col, i; const int32x4_t f = vdupq_n_s32(flimit); uint8x8_t below_context = vdup_n_u8(0); // 8 columns are processed at a time. // If rows is less than 8 the bottom border extension fails. assert(cols % 8 == 0); assert(rows >= 8); // Load and keep the first 8 values in memory. Process a vertical stripe that // is 8 wide. for (col = 0; col < cols; col += 8) { uint8x8_t s, above_context[8]; int16x8_t sum, sum_tmp; int32x4_t sumsq_low, sumsq_high; // Load and extend the top border. s = vld1_u8(dst); for (i = 0; i < 8; i++) { above_context[i] = s; } sum_tmp = vreinterpretq_s16_u16(vmovl_u8(s)); // sum * 9 sum = vmulq_n_s16(sum_tmp, 9); // (sum * 9) * sum == sum * sum * 9 sumsq_low = vmull_s16(vget_low_s16(sum), vget_low_s16(sum_tmp)); sumsq_high = vmull_s16(vget_high_s16(sum), vget_high_s16(sum_tmp)); // Load and discard the next 6 values to prime sum and sumsq. for (i = 1; i <= 6; ++i) { const uint8x8_t a = vld1_u8(dst + i * pitch); const int16x8_t b = vreinterpretq_s16_u16(vmovl_u8(a)); sum = vaddq_s16(sum, b); sumsq_low = vmlal_s16(sumsq_low, vget_low_s16(b), vget_low_s16(b)); sumsq_high = vmlal_s16(sumsq_high, vget_high_s16(b), vget_high_s16(b)); } for (row = 0; row < rows; ++row) { uint8x8_t mask, output; int16x8_t x, y; int32x4_t xy_low, xy_high; s = vld1_u8(dst + row * pitch); // Extend the bottom border. if (row + 7 < rows) { below_context = vld1_u8(dst + (row + 7) * pitch); } x = vreinterpretq_s16_u16(vsubl_u8(below_context, above_context[0])); y = vreinterpretq_s16_u16(vaddl_u8(below_context, above_context[0])); xy_low = vmull_s16(vget_low_s16(x), vget_low_s16(y)); xy_high = vmull_s16(vget_high_s16(x), vget_high_s16(y)); sum = vaddq_s16(sum, x); sumsq_low = vaddq_s32(sumsq_low, xy_low); sumsq_high = vaddq_s32(sumsq_high, xy_high); mask = combine_mask(vget_low_s16(sum), vget_high_s16(sum), sumsq_low, sumsq_high, f); output = filter_pixels_rv(sum, s, vld1q_s16(vpx_rv + (row & 127))); output = vbsl_u8(mask, output, s); vst1_u8(dst + row * pitch, output); above_context[0] = above_context[1]; above_context[1] = above_context[2]; above_context[2] = above_context[3]; above_context[3] = above_context[4]; above_context[4] = above_context[5]; above_context[5] = above_context[6]; above_context[6] = above_context[7]; above_context[7] = s; } dst += 8; } }