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Diffstat (limited to '')
| -rw-r--r-- | third_party/aom/av1/common/arm/resize_neon.c | 1178 |
1 files changed, 1178 insertions, 0 deletions
diff --git a/third_party/aom/av1/common/arm/resize_neon.c b/third_party/aom/av1/common/arm/resize_neon.c new file mode 100644 index 0000000000..b00ebd1fc2 --- /dev/null +++ b/third_party/aom/av1/common/arm/resize_neon.c @@ -0,0 +1,1178 @@ +/* + * + * Copyright (c) 2020, Alliance for Open Media. All rights reserved + * + * This source code is subject to the terms of the BSD 2 Clause License and + * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License + * was not distributed with this source code in the LICENSE file, you can + * obtain it at www.aomedia.org/license/software. If the Alliance for Open + * Media Patent License 1.0 was not distributed with this source code in the + * PATENTS file, you can obtain it at www.aomedia.org/license/patent. + */ +#include <arm_neon.h> +#include <assert.h> + +#include "aom_dsp/arm/mem_neon.h" +#include "aom_dsp/arm/transpose_neon.h" +#include "av1/common/resize.h" +#include "config/av1_rtcd.h" +#include "config/aom_scale_rtcd.h" + +static INLINE int16x4_t convolve8_4(const int16x4_t s0, const int16x4_t s1, + const int16x4_t s2, const int16x4_t s3, + const int16x4_t s4, const int16x4_t s5, + const int16x4_t s6, const int16x4_t s7, + const int16x8_t filter) { + const int16x4_t filter_lo = vget_low_s16(filter); + const int16x4_t filter_hi = vget_high_s16(filter); + + int16x4_t sum = vmul_lane_s16(s0, filter_lo, 0); + sum = vmla_lane_s16(sum, s1, filter_lo, 1); + sum = vmla_lane_s16(sum, s2, filter_lo, 2); + sum = vmla_lane_s16(sum, s5, filter_hi, 1); + sum = vmla_lane_s16(sum, s6, filter_hi, 2); + sum = vmla_lane_s16(sum, s7, filter_hi, 3); + sum = vqadd_s16(sum, vmul_lane_s16(s3, filter_lo, 3)); + sum = vqadd_s16(sum, vmul_lane_s16(s4, filter_hi, 0)); + return sum; +} + +static INLINE uint8x8_t convolve8_8(const int16x8_t s0, const int16x8_t s1, + const int16x8_t s2, const int16x8_t s3, + const int16x8_t s4, const int16x8_t s5, + const int16x8_t s6, const int16x8_t s7, + const int16x8_t filter) { + const int16x4_t filter_lo = vget_low_s16(filter); + const int16x4_t filter_hi = vget_high_s16(filter); + + int16x8_t sum = vmulq_lane_s16(s0, filter_lo, 0); + sum = vmlaq_lane_s16(sum, s1, filter_lo, 1); + sum = vmlaq_lane_s16(sum, s2, filter_lo, 2); + sum = vmlaq_lane_s16(sum, s5, filter_hi, 1); + sum = vmlaq_lane_s16(sum, s6, filter_hi, 2); + sum = vmlaq_lane_s16(sum, s7, filter_hi, 3); + sum = vqaddq_s16(sum, vmulq_lane_s16(s3, filter_lo, 3)); + sum = vqaddq_s16(sum, vmulq_lane_s16(s4, filter_hi, 0)); + return vqrshrun_n_s16(sum, 7); +} + +static INLINE uint8x8_t scale_filter_8(const uint8x8_t *const s, + const int16x8_t filter) { + int16x8_t ss0 = vreinterpretq_s16_u16(vmovl_u8(s[0])); + int16x8_t ss1 = vreinterpretq_s16_u16(vmovl_u8(s[1])); + int16x8_t ss2 = vreinterpretq_s16_u16(vmovl_u8(s[2])); + int16x8_t ss3 = vreinterpretq_s16_u16(vmovl_u8(s[3])); + int16x8_t ss4 = vreinterpretq_s16_u16(vmovl_u8(s[4])); + int16x8_t ss5 = vreinterpretq_s16_u16(vmovl_u8(s[5])); + int16x8_t ss6 = vreinterpretq_s16_u16(vmovl_u8(s[6])); + int16x8_t ss7 = vreinterpretq_s16_u16(vmovl_u8(s[7])); + + return convolve8_8(ss0, ss1, ss2, ss3, ss4, ss5, ss6, ss7, filter); +} + +static INLINE void scale_plane_2_to_1_phase_0(const uint8_t *src, + const int src_stride, + uint8_t *dst, + const int dst_stride, const int w, + const int h) { + const int max_width = (w + 15) & ~15; + int y = h; + + assert(w && h); + + do { + int x = max_width; + do { + const uint8x16x2_t s = vld2q_u8(src); + vst1q_u8(dst, s.val[0]); + src += 32; + dst += 16; + x -= 16; + } while (x); + src += 2 * (src_stride - max_width); + dst += dst_stride - max_width; + } while (--y); +} + +static INLINE void scale_plane_4_to_1_phase_0(const uint8_t *src, + const int src_stride, + uint8_t *dst, + const int dst_stride, const int w, + const int h) { + const int max_width = (w + 15) & ~15; + int y = h; + + assert(w && h); + + do { + int x = max_width; + do { + const uint8x16x4_t s = vld4q_u8(src); + vst1q_u8(dst, s.val[0]); + src += 64; + dst += 16; + x -= 16; + } while (x); + src += 4 * (src_stride - max_width); + dst += dst_stride - max_width; + } while (--y); +} + +static INLINE void scale_plane_bilinear_kernel( + const uint8x16_t in0, const uint8x16_t in1, const uint8x16_t in2, + const uint8x16_t in3, const uint8x8_t coef0, const uint8x8_t coef1, + uint8_t *const dst) { + const uint16x8_t h0 = vmull_u8(vget_low_u8(in0), coef0); + const uint16x8_t h1 = vmull_u8(vget_high_u8(in0), coef0); + const uint16x8_t h2 = vmull_u8(vget_low_u8(in2), coef0); + const uint16x8_t h3 = vmull_u8(vget_high_u8(in2), coef0); + const uint16x8_t h4 = vmlal_u8(h0, vget_low_u8(in1), coef1); + const uint16x8_t h5 = vmlal_u8(h1, vget_high_u8(in1), coef1); + const uint16x8_t h6 = vmlal_u8(h2, vget_low_u8(in3), coef1); + const uint16x8_t h7 = vmlal_u8(h3, vget_high_u8(in3), coef1); + + const uint8x8_t hor0 = vrshrn_n_u16(h4, 7); // temp: 00 01 02 03 04 05 06 07 + const uint8x8_t hor1 = vrshrn_n_u16(h5, 7); // temp: 08 09 0A 0B 0C 0D 0E 0F + const uint8x8_t hor2 = vrshrn_n_u16(h6, 7); // temp: 10 11 12 13 14 15 16 17 + const uint8x8_t hor3 = vrshrn_n_u16(h7, 7); // temp: 18 19 1A 1B 1C 1D 1E 1F + const uint16x8_t v0 = vmull_u8(hor0, coef0); + const uint16x8_t v1 = vmull_u8(hor1, coef0); + const uint16x8_t v2 = vmlal_u8(v0, hor2, coef1); + const uint16x8_t v3 = vmlal_u8(v1, hor3, coef1); + // dst: 0 1 2 3 4 5 6 7 8 9 A B C D E F + const uint8x16_t d = vcombine_u8(vrshrn_n_u16(v2, 7), vrshrn_n_u16(v3, 7)); + vst1q_u8(dst, d); +} + +static INLINE void scale_plane_2_to_1_bilinear( + const uint8_t *const src, const int src_stride, uint8_t *dst, + const int dst_stride, const int w, const int h, const int16_t c0, + const int16_t c1) { + const int max_width = (w + 15) & ~15; + const uint8_t *src0 = src; + const uint8_t *src1 = src + src_stride; + const uint8x8_t coef0 = vdup_n_u8(c0); + const uint8x8_t coef1 = vdup_n_u8(c1); + int y = h; + + assert(w && h); + + do { + int x = max_width; + do { + // 000 002 004 006 008 00A 00C 00E 010 012 014 016 018 01A 01C 01E + // 001 003 005 007 009 00B 00D 00F 011 013 015 017 019 01B 01D 01F + const uint8x16x2_t s0 = vld2q_u8(src0); + // 100 102 104 106 108 10A 10C 10E 110 112 114 116 118 11A 11C 11E + // 101 103 105 107 109 10B 10D 10F 111 113 115 117 119 11B 11D 11F + const uint8x16x2_t s1 = vld2q_u8(src1); + scale_plane_bilinear_kernel(s0.val[0], s0.val[1], s1.val[0], s1.val[1], + coef0, coef1, dst); + src0 += 32; + src1 += 32; + dst += 16; + x -= 16; + } while (x); + src0 += 2 * (src_stride - max_width); + src1 += 2 * (src_stride - max_width); + dst += dst_stride - max_width; + } while (--y); +} + +static INLINE void scale_plane_4_to_1_bilinear( + const uint8_t *const src, const int src_stride, uint8_t *dst, + const int dst_stride, const int w, const int h, const int16_t c0, + const int16_t c1) { + const int max_width = (w + 15) & ~15; + const uint8_t *src0 = src; + const uint8_t *src1 = src + src_stride; + const uint8x8_t coef0 = vdup_n_u8(c0); + const uint8x8_t coef1 = vdup_n_u8(c1); + int y = h; + + assert(w && h); + + do { + int x = max_width; + do { + // (*) -- useless + // 000 004 008 00C 010 014 018 01C 020 024 028 02C 030 034 038 03C + // 001 005 009 00D 011 015 019 01D 021 025 029 02D 031 035 039 03D + // 002 006 00A 00E 012 016 01A 01E 022 026 02A 02E 032 036 03A 03E (*) + // 003 007 00B 00F 013 017 01B 01F 023 027 02B 02F 033 037 03B 03F (*) + const uint8x16x4_t s0 = vld4q_u8(src0); + // 100 104 108 10C 110 114 118 11C 120 124 128 12C 130 134 138 13C + // 101 105 109 10D 111 115 119 11D 121 125 129 12D 131 135 139 13D + // 102 106 10A 10E 112 116 11A 11E 122 126 12A 12E 132 136 13A 13E (*) + // 103 107 10B 10F 113 117 11B 11F 123 127 12B 12F 133 137 13B 13F (*) + const uint8x16x4_t s1 = vld4q_u8(src1); + scale_plane_bilinear_kernel(s0.val[0], s0.val[1], s1.val[0], s1.val[1], + coef0, coef1, dst); + src0 += 64; + src1 += 64; + dst += 16; + x -= 16; + } while (x); + src0 += 4 * (src_stride - max_width); + src1 += 4 * (src_stride - max_width); + dst += dst_stride - max_width; + } while (--y); +} + +static void scale_plane_2_to_1_general(const uint8_t *src, const int src_stride, + uint8_t *dst, const int dst_stride, + const int w, const int h, + const int16_t *const coef, + uint8_t *const temp_buffer) { + const int width_hor = (w + 3) & ~3; + const int width_ver = (w + 7) & ~7; + const int height_hor = (2 * h + SUBPEL_TAPS - 2 + 7) & ~7; + const int height_ver = (h + 3) & ~3; + const int16x8_t filters = vld1q_s16(coef); + int x, y = height_hor; + uint8_t *t = temp_buffer; + uint8x8_t s[14], d[4]; + + assert(w && h); + + src -= (SUBPEL_TAPS / 2 - 1) * src_stride + SUBPEL_TAPS / 2 + 1; + + // horizontal 4x8 + // Note: processing 4x8 is about 20% faster than processing row by row using + // vld4_u8(). + do { + load_u8_8x8(src + 2, src_stride, &s[0], &s[1], &s[2], &s[3], &s[4], &s[5], + &s[6], &s[7]); + transpose_elems_inplace_u8_8x8(&s[0], &s[1], &s[2], &s[3], &s[4], &s[5], + &s[6], &s[7]); + x = width_hor; + + do { + src += 8; + load_u8_8x8(src, src_stride, &s[6], &s[7], &s[8], &s[9], &s[10], &s[11], + &s[12], &s[13]); + transpose_elems_inplace_u8_8x8(&s[6], &s[7], &s[8], &s[9], &s[10], &s[11], + &s[12], &s[13]); + + d[0] = scale_filter_8(&s[0], filters); // 00 10 20 30 40 50 60 70 + d[1] = scale_filter_8(&s[2], filters); // 01 11 21 31 41 51 61 71 + d[2] = scale_filter_8(&s[4], filters); // 02 12 22 32 42 52 62 72 + d[3] = scale_filter_8(&s[6], filters); // 03 13 23 33 43 53 63 73 + // 00 01 02 03 40 41 42 43 + // 10 11 12 13 50 51 52 53 + // 20 21 22 23 60 61 62 63 + // 30 31 32 33 70 71 72 73 + transpose_elems_inplace_u8_8x4(&d[0], &d[1], &d[2], &d[3]); + vst1_lane_u32((uint32_t *)(t + 0 * width_hor), vreinterpret_u32_u8(d[0]), + 0); + vst1_lane_u32((uint32_t *)(t + 1 * width_hor), vreinterpret_u32_u8(d[1]), + 0); + vst1_lane_u32((uint32_t *)(t + 2 * width_hor), vreinterpret_u32_u8(d[2]), + 0); + vst1_lane_u32((uint32_t *)(t + 3 * width_hor), vreinterpret_u32_u8(d[3]), + 0); + vst1_lane_u32((uint32_t *)(t + 4 * width_hor), vreinterpret_u32_u8(d[0]), + 1); + vst1_lane_u32((uint32_t *)(t + 5 * width_hor), vreinterpret_u32_u8(d[1]), + 1); + vst1_lane_u32((uint32_t *)(t + 6 * width_hor), vreinterpret_u32_u8(d[2]), + 1); + vst1_lane_u32((uint32_t *)(t + 7 * width_hor), vreinterpret_u32_u8(d[3]), + 1); + + s[0] = s[8]; + s[1] = s[9]; + s[2] = s[10]; + s[3] = s[11]; + s[4] = s[12]; + s[5] = s[13]; + + t += 4; + x -= 4; + } while (x); + src += 8 * src_stride - 2 * width_hor; + t += 7 * width_hor; + y -= 8; + } while (y); + + // vertical 8x4 + x = width_ver; + t = temp_buffer; + do { + load_u8_8x8(t, width_hor, &s[0], &s[1], &s[2], &s[3], &s[4], &s[5], &s[6], + &s[7]); + t += 6 * width_hor; + y = height_ver; + + do { + load_u8_8x8(t, width_hor, &s[6], &s[7], &s[8], &s[9], &s[10], &s[11], + &s[12], &s[13]); + t += 8 * width_hor; + + d[0] = scale_filter_8(&s[0], filters); // 00 01 02 03 04 05 06 07 + d[1] = scale_filter_8(&s[2], filters); // 10 11 12 13 14 15 16 17 + d[2] = scale_filter_8(&s[4], filters); // 20 21 22 23 24 25 26 27 + d[3] = scale_filter_8(&s[6], filters); // 30 31 32 33 34 35 36 37 + vst1_u8(dst + 0 * dst_stride, d[0]); + vst1_u8(dst + 1 * dst_stride, d[1]); + vst1_u8(dst + 2 * dst_stride, d[2]); + vst1_u8(dst + 3 * dst_stride, d[3]); + + s[0] = s[8]; + s[1] = s[9]; + s[2] = s[10]; + s[3] = s[11]; + s[4] = s[12]; + s[5] = s[13]; + + dst += 4 * dst_stride; + y -= 4; + } while (y); + t -= width_hor * (2 * height_ver + 6); + t += 8; + dst -= height_ver * dst_stride; + dst += 8; + x -= 8; + } while (x); +} + +static void scale_plane_4_to_1_general(const uint8_t *src, const int src_stride, + uint8_t *dst, const int dst_stride, + const int w, const int h, + const int16_t *const coef, + uint8_t *const temp_buffer) { + const int width_hor = (w + 1) & ~1; + const int width_ver = (w + 7) & ~7; + const int height_hor = (4 * h + SUBPEL_TAPS - 2 + 7) & ~7; + const int height_ver = (h + 1) & ~1; + const int16x8_t filters = vld1q_s16(coef); + int x, y = height_hor; + uint8_t *t = temp_buffer; + uint8x8_t s[12], d[2]; + + assert(w && h); + + src -= (SUBPEL_TAPS / 2 - 1) * src_stride + SUBPEL_TAPS / 2 + 3; + + // horizontal 2x8 + // Note: processing 2x8 is about 20% faster than processing row by row using + // vld4_u8(). + do { + load_u8_8x8(src + 4, src_stride, &s[0], &s[1], &s[2], &s[3], &s[4], &s[5], + &s[6], &s[7]); + transpose_elems_u8_4x8(s[0], s[1], s[2], s[3], s[4], s[5], s[6], s[7], + &s[0], &s[1], &s[2], &s[3]); + x = width_hor; + + do { + uint8x8x2_t dd; + src += 8; + load_u8_8x8(src, src_stride, &s[4], &s[5], &s[6], &s[7], &s[8], &s[9], + &s[10], &s[11]); + transpose_elems_inplace_u8_8x8(&s[4], &s[5], &s[6], &s[7], &s[8], &s[9], + &s[10], &s[11]); + + d[0] = scale_filter_8(&s[0], filters); // 00 10 20 30 40 50 60 70 + d[1] = scale_filter_8(&s[4], filters); // 01 11 21 31 41 51 61 71 + // dd.val[0]: 00 01 20 21 40 41 60 61 + // dd.val[1]: 10 11 30 31 50 51 70 71 + dd = vtrn_u8(d[0], d[1]); + vst1_lane_u16((uint16_t *)(t + 0 * width_hor), + vreinterpret_u16_u8(dd.val[0]), 0); + vst1_lane_u16((uint16_t *)(t + 1 * width_hor), + vreinterpret_u16_u8(dd.val[1]), 0); + vst1_lane_u16((uint16_t *)(t + 2 * width_hor), + vreinterpret_u16_u8(dd.val[0]), 1); + vst1_lane_u16((uint16_t *)(t + 3 * width_hor), + vreinterpret_u16_u8(dd.val[1]), 1); + vst1_lane_u16((uint16_t *)(t + 4 * width_hor), + vreinterpret_u16_u8(dd.val[0]), 2); + vst1_lane_u16((uint16_t *)(t + 5 * width_hor), + vreinterpret_u16_u8(dd.val[1]), 2); + vst1_lane_u16((uint16_t *)(t + 6 * width_hor), + vreinterpret_u16_u8(dd.val[0]), 3); + vst1_lane_u16((uint16_t *)(t + 7 * width_hor), + vreinterpret_u16_u8(dd.val[1]), 3); + + s[0] = s[8]; + s[1] = s[9]; + s[2] = s[10]; + s[3] = s[11]; + + t += 2; + x -= 2; + } while (x); + src += 8 * src_stride - 4 * width_hor; + t += 7 * width_hor; + y -= 8; + } while (y); + + // vertical 8x2 + x = width_ver; + t = temp_buffer; + do { + load_u8_8x4(t, width_hor, &s[0], &s[1], &s[2], &s[3]); + t += 4 * width_hor; + y = height_ver; + + do { + load_u8_8x8(t, width_hor, &s[4], &s[5], &s[6], &s[7], &s[8], &s[9], + &s[10], &s[11]); + t += 8 * width_hor; + + d[0] = scale_filter_8(&s[0], filters); // 00 01 02 03 04 05 06 07 + d[1] = scale_filter_8(&s[4], filters); // 10 11 12 13 14 15 16 17 + vst1_u8(dst + 0 * dst_stride, d[0]); + vst1_u8(dst + 1 * dst_stride, d[1]); + + s[0] = s[8]; + s[1] = s[9]; + s[2] = s[10]; + s[3] = s[11]; + + dst += 2 * dst_stride; + y -= 2; + } while (y); + t -= width_hor * (4 * height_ver + 4); + t += 8; + dst -= height_ver * dst_stride; + dst += 8; + x -= 8; + } while (x); +} + +static INLINE uint8x8_t scale_filter_bilinear(const uint8x8_t *const s, + const uint8x8_t *const coef) { + const uint16x8_t h0 = vmull_u8(s[0], coef[0]); + const uint16x8_t h1 = vmlal_u8(h0, s[1], coef[1]); + + return vrshrn_n_u16(h1, 7); +} + +// Notes for 4 to 3 scaling: +// +// 1. 6 rows are calculated in each horizontal inner loop, so width_hor must be +// multiple of 6, and no less than w. +// +// 2. 8 rows are calculated in each vertical inner loop, so width_ver must be +// multiple of 8, and no less than w. +// +// 3. 8 columns are calculated in each horizontal inner loop for further +// vertical scaling, so height_hor must be multiple of 8, and no less than +// 4 * h / 3. +// +// 4. 6 columns are calculated in each vertical inner loop, so height_ver must +// be multiple of 6, and no less than h. +// +// 5. The physical location of the last row of the 4 to 3 scaled frame is +// decided by phase_scaler, and are always less than 1 pixel below the last row +// of the original image. +static void scale_plane_4_to_3_bilinear(const uint8_t *src, + const int src_stride, uint8_t *dst, + const int dst_stride, const int w, + const int h, const int phase_scaler, + uint8_t *const temp_buffer) { + static const int step_q4 = 16 * 4 / 3; + const int width_hor = (w + 5) - ((w + 5) % 6); + const int stride_hor = width_hor + 2; // store 2 extra pixels + const int width_ver = (w + 7) & ~7; + // We only need 1 extra row below because there are only 2 bilinear + // coefficients. + const int height_hor = (4 * h / 3 + 1 + 7) & ~7; + const int height_ver = (h + 5) - ((h + 5) % 6); + int x, y = height_hor; + uint8_t *t = temp_buffer; + uint8x8_t s[9], d[8], c[6]; + const InterpKernel *interp_kernel = + (const InterpKernel *)av1_interp_filter_params_list[BILINEAR].filter_ptr; + assert(w && h); + + c[0] = vdup_n_u8((uint8_t)interp_kernel[phase_scaler][3]); + c[1] = vdup_n_u8((uint8_t)interp_kernel[phase_scaler][4]); + c[2] = vdup_n_u8( + (uint8_t)interp_kernel[(phase_scaler + 1 * step_q4) & SUBPEL_MASK][3]); + c[3] = vdup_n_u8( + (uint8_t)interp_kernel[(phase_scaler + 1 * step_q4) & SUBPEL_MASK][4]); + c[4] = vdup_n_u8( + (uint8_t)interp_kernel[(phase_scaler + 2 * step_q4) & SUBPEL_MASK][3]); + c[5] = vdup_n_u8( + (uint8_t)interp_kernel[(phase_scaler + 2 * step_q4) & SUBPEL_MASK][4]); + + d[6] = vdup_n_u8(0); + d[7] = vdup_n_u8(0); + + // horizontal 6x8 + do { + load_u8_8x8(src, src_stride, &s[0], &s[1], &s[2], &s[3], &s[4], &s[5], + &s[6], &s[7]); + src += 1; + transpose_elems_inplace_u8_8x8(&s[0], &s[1], &s[2], &s[3], &s[4], &s[5], + &s[6], &s[7]); + x = width_hor; + + do { + load_u8_8x8(src, src_stride, &s[1], &s[2], &s[3], &s[4], &s[5], &s[6], + &s[7], &s[8]); + src += 8; + transpose_elems_inplace_u8_8x8(&s[1], &s[2], &s[3], &s[4], &s[5], &s[6], + &s[7], &s[8]); + + // 00 10 20 30 40 50 60 70 + // 01 11 21 31 41 51 61 71 + // 02 12 22 32 42 52 62 72 + // 03 13 23 33 43 53 63 73 + // 04 14 24 34 44 54 64 74 + // 05 15 25 35 45 55 65 75 + d[0] = scale_filter_bilinear(&s[0], &c[0]); + d[1] = + scale_filter_bilinear(&s[(phase_scaler + 1 * step_q4) >> 4], &c[2]); + d[2] = + scale_filter_bilinear(&s[(phase_scaler + 2 * step_q4) >> 4], &c[4]); + d[3] = scale_filter_bilinear(&s[4], &c[0]); + d[4] = scale_filter_bilinear(&s[4 + ((phase_scaler + 1 * step_q4) >> 4)], + &c[2]); + d[5] = scale_filter_bilinear(&s[4 + ((phase_scaler + 2 * step_q4) >> 4)], + &c[4]); + + // 00 01 02 03 04 05 xx xx + // 10 11 12 13 14 15 xx xx + // 20 21 22 23 24 25 xx xx + // 30 31 32 33 34 35 xx xx + // 40 41 42 43 44 45 xx xx + // 50 51 52 53 54 55 xx xx + // 60 61 62 63 64 65 xx xx + // 70 71 72 73 74 75 xx xx + transpose_elems_inplace_u8_8x8(&d[0], &d[1], &d[2], &d[3], &d[4], &d[5], + &d[6], &d[7]); + // store 2 extra pixels + vst1_u8(t + 0 * stride_hor, d[0]); + vst1_u8(t + 1 * stride_hor, d[1]); + vst1_u8(t + 2 * stride_hor, d[2]); + vst1_u8(t + 3 * stride_hor, d[3]); + vst1_u8(t + 4 * stride_hor, d[4]); + vst1_u8(t + 5 * stride_hor, d[5]); + vst1_u8(t + 6 * stride_hor, d[6]); + vst1_u8(t + 7 * stride_hor, d[7]); + + s[0] = s[8]; + + t += 6; + x -= 6; + } while (x); + src += 8 * src_stride - 4 * width_hor / 3 - 1; + t += 7 * stride_hor + 2; + y -= 8; + } while (y); + + // vertical 8x6 + x = width_ver; + t = temp_buffer; + do { + load_u8_8x8(t, stride_hor, &s[0], &s[1], &s[2], &s[3], &s[4], &s[5], &s[6], + &s[7]); + t += stride_hor; + y = height_ver; + + do { + load_u8_8x8(t, stride_hor, &s[1], &s[2], &s[3], &s[4], &s[5], &s[6], + &s[7], &s[8]); + t += 8 * stride_hor; + + d[0] = scale_filter_bilinear(&s[0], &c[0]); + d[1] = + scale_filter_bilinear(&s[(phase_scaler + 1 * step_q4) >> 4], &c[2]); + d[2] = + scale_filter_bilinear(&s[(phase_scaler + 2 * step_q4) >> 4], &c[4]); + d[3] = scale_filter_bilinear(&s[4], &c[0]); + d[4] = scale_filter_bilinear(&s[4 + ((phase_scaler + 1 * step_q4) >> 4)], + &c[2]); + d[5] = scale_filter_bilinear(&s[4 + ((phase_scaler + 2 * step_q4) >> 4)], + &c[4]); + vst1_u8(dst + 0 * dst_stride, d[0]); + vst1_u8(dst + 1 * dst_stride, d[1]); + vst1_u8(dst + 2 * dst_stride, d[2]); + vst1_u8(dst + 3 * dst_stride, d[3]); + vst1_u8(dst + 4 * dst_stride, d[4]); + vst1_u8(dst + 5 * dst_stride, d[5]); + + s[0] = s[8]; + + dst += 6 * dst_stride; + y -= 6; + } while (y); + t -= stride_hor * (4 * height_ver / 3 + 1); + t += 8; + dst -= height_ver * dst_stride; + dst += 8; + x -= 8; + } while (x); +} + +static void scale_plane_4_to_3_general(const uint8_t *src, const int src_stride, + uint8_t *dst, const int dst_stride, + const int w, const int h, + const InterpKernel *const coef, + const int phase_scaler, + uint8_t *const temp_buffer) { + static const int step_q4 = 16 * 4 / 3; + const int width_hor = (w + 5) - ((w + 5) % 6); + const int stride_hor = width_hor + 2; // store 2 extra pixels + const int width_ver = (w + 7) & ~7; + // We need (SUBPEL_TAPS - 1) extra rows: (SUBPEL_TAPS / 2 - 1) extra rows + // above and (SUBPEL_TAPS / 2) extra rows below. + const int height_hor = (4 * h / 3 + SUBPEL_TAPS - 1 + 7) & ~7; + const int height_ver = (h + 5) - ((h + 5) % 6); + const int16x8_t filters0 = vld1q_s16( + (const int16_t *)&coef[(phase_scaler + 0 * step_q4) & SUBPEL_MASK]); + const int16x8_t filters1 = vld1q_s16( + (const int16_t *)&coef[(phase_scaler + 1 * step_q4) & SUBPEL_MASK]); + const int16x8_t filters2 = vld1q_s16( + (const int16_t *)&coef[(phase_scaler + 2 * step_q4) & SUBPEL_MASK]); + int x, y = height_hor; + uint8_t *t = temp_buffer; + uint8x8_t s[15], d[8]; + + assert(w && h); + + src -= (SUBPEL_TAPS / 2 - 1) * src_stride + SUBPEL_TAPS / 2; + d[6] = vdup_n_u8(0); + d[7] = vdup_n_u8(0); + + // horizontal 6x8 + do { + load_u8_8x8(src + 1, src_stride, &s[0], &s[1], &s[2], &s[3], &s[4], &s[5], + &s[6], &s[7]); + transpose_elems_inplace_u8_8x8(&s[0], &s[1], &s[2], &s[3], &s[4], &s[5], + &s[6], &s[7]); + x = width_hor; + + do { + src += 8; + load_u8_8x8(src, src_stride, &s[7], &s[8], &s[9], &s[10], &s[11], &s[12], + &s[13], &s[14]); + transpose_elems_inplace_u8_8x8(&s[7], &s[8], &s[9], &s[10], &s[11], + &s[12], &s[13], &s[14]); + + // 00 10 20 30 40 50 60 70 + // 01 11 21 31 41 51 61 71 + // 02 12 22 32 42 52 62 72 + // 03 13 23 33 43 53 63 73 + // 04 14 24 34 44 54 64 74 + // 05 15 25 35 45 55 65 75 + d[0] = scale_filter_8(&s[0], filters0); + d[1] = scale_filter_8(&s[(phase_scaler + 1 * step_q4) >> 4], filters1); + d[2] = scale_filter_8(&s[(phase_scaler + 2 * step_q4) >> 4], filters2); + d[3] = scale_filter_8(&s[4], filters0); + d[4] = + scale_filter_8(&s[4 + ((phase_scaler + 1 * step_q4) >> 4)], filters1); + d[5] = + scale_filter_8(&s[4 + ((phase_scaler + 2 * step_q4) >> 4)], filters2); + + // 00 01 02 03 04 05 xx xx + // 10 11 12 13 14 15 xx xx + // 20 21 22 23 24 25 xx xx + // 30 31 32 33 34 35 xx xx + // 40 41 42 43 44 45 xx xx + // 50 51 52 53 54 55 xx xx + // 60 61 62 63 64 65 xx xx + // 70 71 72 73 74 75 xx xx + transpose_elems_inplace_u8_8x8(&d[0], &d[1], &d[2], &d[3], &d[4], &d[5], + &d[6], &d[7]); + // store 2 extra pixels + vst1_u8(t + 0 * stride_hor, d[0]); + vst1_u8(t + 1 * stride_hor, d[1]); + vst1_u8(t + 2 * stride_hor, d[2]); + vst1_u8(t + 3 * stride_hor, d[3]); + vst1_u8(t + 4 * stride_hor, d[4]); + vst1_u8(t + 5 * stride_hor, d[5]); + vst1_u8(t + 6 * stride_hor, d[6]); + vst1_u8(t + 7 * stride_hor, d[7]); + + s[0] = s[8]; + s[1] = s[9]; + s[2] = s[10]; + s[3] = s[11]; + s[4] = s[12]; + s[5] = s[13]; + s[6] = s[14]; + + t += 6; + x -= 6; + } while (x); + src += 8 * src_stride - 4 * width_hor / 3; + t += 7 * stride_hor + 2; + y -= 8; + } while (y); + + // vertical 8x6 + x = width_ver; + t = temp_buffer; + do { + load_u8_8x8(t, stride_hor, &s[0], &s[1], &s[2], &s[3], &s[4], &s[5], &s[6], + &s[7]); + t += 7 * stride_hor; + y = height_ver; + + do { + load_u8_8x8(t, stride_hor, &s[7], &s[8], &s[9], &s[10], &s[11], &s[12], + &s[13], &s[14]); + t += 8 * stride_hor; + + d[0] = scale_filter_8(&s[0], filters0); + d[1] = scale_filter_8(&s[(phase_scaler + 1 * step_q4) >> 4], filters1); + d[2] = scale_filter_8(&s[(phase_scaler + 2 * step_q4) >> 4], filters2); + d[3] = scale_filter_8(&s[4], filters0); + d[4] = + scale_filter_8(&s[4 + ((phase_scaler + 1 * step_q4) >> 4)], filters1); + d[5] = + scale_filter_8(&s[4 + ((phase_scaler + 2 * step_q4) >> 4)], filters2); + vst1_u8(dst + 0 * dst_stride, d[0]); + vst1_u8(dst + 1 * dst_stride, d[1]); + vst1_u8(dst + 2 * dst_stride, d[2]); + vst1_u8(dst + 3 * dst_stride, d[3]); + vst1_u8(dst + 4 * dst_stride, d[4]); + vst1_u8(dst + 5 * dst_stride, d[5]); + + s[0] = s[8]; + s[1] = s[9]; + s[2] = s[10]; + s[3] = s[11]; + s[4] = s[12]; + s[5] = s[13]; + s[6] = s[14]; + + dst += 6 * dst_stride; + y -= 6; + } while (y); + t -= stride_hor * (4 * height_ver / 3 + 7); + t += 8; + dst -= height_ver * dst_stride; + dst += 8; + x -= 8; + } while (x); +} + +// There's SIMD optimizations for 1/4, 1/2 and 3/4 downscaling in NEON. +static INLINE bool has_normative_scaler_neon(const int src_width, + const int src_height, + const int dst_width, + const int dst_height) { + const bool has_normative_scaler = + (2 * dst_width == src_width && 2 * dst_height == src_height) || + (4 * dst_width == src_width && 4 * dst_height == src_height) || + (4 * dst_width == 3 * src_width && 4 * dst_height == 3 * src_height); + + return has_normative_scaler; +} + +void av1_resize_and_extend_frame_neon(const YV12_BUFFER_CONFIG *src, + YV12_BUFFER_CONFIG *dst, + const InterpFilter filter, + const int phase, const int num_planes) { + bool has_normative_scaler = + has_normative_scaler_neon(src->y_crop_width, src->y_crop_height, + dst->y_crop_width, dst->y_crop_height); + + if (num_planes > 1) { + has_normative_scaler = + has_normative_scaler && + has_normative_scaler_neon(src->uv_crop_width, src->uv_crop_height, + dst->uv_crop_width, dst->uv_crop_height); + } + + if (!has_normative_scaler) { + av1_resize_and_extend_frame_c(src, dst, filter, phase, num_planes); + return; + } + + // We use AOMMIN(num_planes, MAX_MB_PLANE) instead of num_planes to quiet + // the static analysis warnings. + int malloc_failed = 0; + for (int i = 0; i < AOMMIN(num_planes, MAX_MB_PLANE); ++i) { + const int is_uv = i > 0; + const int src_w = src->crop_widths[is_uv]; + const int src_h = src->crop_heights[is_uv]; + const int dst_w = dst->crop_widths[is_uv]; + const int dst_h = dst->crop_heights[is_uv]; + const int dst_y_w = (dst->crop_widths[0] + 1) & ~1; + const int dst_y_h = (dst->crop_heights[0] + 1) & ~1; + + if (2 * dst_w == src_w && 2 * dst_h == src_h) { + if (phase == 0) { + scale_plane_2_to_1_phase_0(src->buffers[i], src->strides[is_uv], + dst->buffers[i], dst->strides[is_uv], dst_w, + dst_h); + } else if (filter == BILINEAR) { + const int16_t c0 = av1_bilinear_filters[phase][3]; + const int16_t c1 = av1_bilinear_filters[phase][4]; + scale_plane_2_to_1_bilinear(src->buffers[i], src->strides[is_uv], + dst->buffers[i], dst->strides[is_uv], dst_w, + dst_h, c0, c1); + } else { + const int buffer_stride = (dst_y_w + 3) & ~3; + const int buffer_height = (2 * dst_y_h + SUBPEL_TAPS - 2 + 7) & ~7; + uint8_t *const temp_buffer = + (uint8_t *)malloc(buffer_stride * buffer_height); + if (!temp_buffer) { + malloc_failed = 1; + break; + } + const InterpKernel *interp_kernel = + (const InterpKernel *)av1_interp_filter_params_list[filter] + .filter_ptr; + scale_plane_2_to_1_general(src->buffers[i], src->strides[is_uv], + dst->buffers[i], dst->strides[is_uv], dst_w, + dst_h, interp_kernel[phase], temp_buffer); + free(temp_buffer); + } + } else if (4 * dst_w == src_w && 4 * dst_h == src_h) { + if (phase == 0) { + scale_plane_4_to_1_phase_0(src->buffers[i], src->strides[is_uv], + dst->buffers[i], dst->strides[is_uv], dst_w, + dst_h); + } else if (filter == BILINEAR) { + const int16_t c0 = av1_bilinear_filters[phase][3]; + const int16_t c1 = av1_bilinear_filters[phase][4]; + scale_plane_4_to_1_bilinear(src->buffers[i], src->strides[is_uv], + dst->buffers[i], dst->strides[is_uv], dst_w, + dst_h, c0, c1); + } else { + const int buffer_stride = (dst_y_w + 1) & ~1; + const int buffer_height = (4 * dst_y_h + SUBPEL_TAPS - 2 + 7) & ~7; + uint8_t *const temp_buffer = + (uint8_t *)malloc(buffer_stride * buffer_height); + if (!temp_buffer) { + malloc_failed = 1; + break; + } + const InterpKernel *interp_kernel = + (const InterpKernel *)av1_interp_filter_params_list[filter] + .filter_ptr; + scale_plane_4_to_1_general(src->buffers[i], src->strides[is_uv], + dst->buffers[i], dst->strides[is_uv], dst_w, + dst_h, interp_kernel[phase], temp_buffer); + free(temp_buffer); + } + } else { + assert(4 * dst_w == 3 * src_w && 4 * dst_h == 3 * src_h); + // 4 to 3 + const int buffer_stride = (dst_y_w + 5) - ((dst_y_w + 5) % 6) + 2; + const int buffer_height = (4 * dst_y_h / 3 + SUBPEL_TAPS - 1 + 7) & ~7; + uint8_t *const temp_buffer = + (uint8_t *)malloc(buffer_stride * buffer_height); + if (!temp_buffer) { + malloc_failed = 1; + break; + } + if (filter == BILINEAR) { + scale_plane_4_to_3_bilinear(src->buffers[i], src->strides[is_uv], + dst->buffers[i], dst->strides[is_uv], dst_w, + dst_h, phase, temp_buffer); + } else { + const InterpKernel *interp_kernel = + (const InterpKernel *)av1_interp_filter_params_list[filter] + .filter_ptr; + scale_plane_4_to_3_general(src->buffers[i], src->strides[is_uv], + dst->buffers[i], dst->strides[is_uv], dst_w, + dst_h, interp_kernel, phase, temp_buffer); + } + free(temp_buffer); + } + } + + if (malloc_failed) { + av1_resize_and_extend_frame_c(src, dst, filter, phase, num_planes); + } else { + aom_extend_frame_borders(dst, num_planes); + } +} + +static INLINE void scaledconvolve_horiz_w4( + const uint8_t *src, const ptrdiff_t src_stride, uint8_t *dst, + const ptrdiff_t dst_stride, const InterpKernel *const x_filters, + const int x0_q4, const int x_step_q4, const int w, const int h) { + DECLARE_ALIGNED(16, uint8_t, temp[4 * 4]); + int x, y, z; + + src -= SUBPEL_TAPS / 2 - 1; + + y = h; + do { + int x_q4 = x0_q4; + x = 0; + do { + // process 4 src_x steps + for (z = 0; z < 4; ++z) { + const uint8_t *const src_x = &src[x_q4 >> SUBPEL_BITS]; + if (x_q4 & SUBPEL_MASK) { + const int16x8_t filters = vld1q_s16(x_filters[x_q4 & SUBPEL_MASK]); + uint8x8_t s[8], d; + int16x8_t ss[4]; + int16x4_t t[8], tt; + + load_u8_8x4(src_x, src_stride, &s[0], &s[1], &s[2], &s[3]); + transpose_elems_inplace_u8_8x4(&s[0], &s[1], &s[2], &s[3]); + + ss[0] = vreinterpretq_s16_u16(vmovl_u8(s[0])); + ss[1] = vreinterpretq_s16_u16(vmovl_u8(s[1])); + ss[2] = vreinterpretq_s16_u16(vmovl_u8(s[2])); + ss[3] = vreinterpretq_s16_u16(vmovl_u8(s[3])); + t[0] = vget_low_s16(ss[0]); + t[1] = vget_low_s16(ss[1]); + t[2] = vget_low_s16(ss[2]); + t[3] = vget_low_s16(ss[3]); + t[4] = vget_high_s16(ss[0]); + t[5] = vget_high_s16(ss[1]); + t[6] = vget_high_s16(ss[2]); + t[7] = vget_high_s16(ss[3]); + + tt = convolve8_4(t[0], t[1], t[2], t[3], t[4], t[5], t[6], t[7], + filters); + d = vqrshrun_n_s16(vcombine_s16(tt, tt), 7); + store_u8_4x1(&temp[4 * z], d); + } else { + int i; + for (i = 0; i < 4; ++i) { + temp[z * 4 + i] = src_x[i * src_stride + 3]; + } + } + x_q4 += x_step_q4; + } + + // transpose the 4x4 filters values back to dst + { + const uint8x8x4_t d4 = vld4_u8(temp); + store_u8_4x1(&dst[x + 0 * dst_stride], d4.val[0]); + store_u8_4x1(&dst[x + 1 * dst_stride], d4.val[1]); + store_u8_4x1(&dst[x + 2 * dst_stride], d4.val[2]); + store_u8_4x1(&dst[x + 3 * dst_stride], d4.val[3]); + } + x += 4; + } while (x < w); + + src += src_stride * 4; + dst += dst_stride * 4; + y -= 4; + } while (y > 0); +} + +static INLINE void scaledconvolve_horiz_w8( + const uint8_t *src, const ptrdiff_t src_stride, uint8_t *dst, + const ptrdiff_t dst_stride, const InterpKernel *const x_filters, + const int x0_q4, const int x_step_q4, const int w, const int h) { + DECLARE_ALIGNED(16, uint8_t, temp[8 * 8]); + int x, y, z; + src -= SUBPEL_TAPS / 2 - 1; + + // This function processes 8x8 areas. The intermediate height is not always + // a multiple of 8, so force it to be a multiple of 8 here. + y = (h + 7) & ~7; + + do { + int x_q4 = x0_q4; + x = 0; + do { + uint8x8_t d[8]; + // process 8 src_x steps + for (z = 0; z < 8; ++z) { + const uint8_t *const src_x = &src[x_q4 >> SUBPEL_BITS]; + + if (x_q4 & SUBPEL_MASK) { + const int16x8_t filters = vld1q_s16(x_filters[x_q4 & SUBPEL_MASK]); + uint8x8_t s[8]; + load_u8_8x8(src_x, src_stride, &s[0], &s[1], &s[2], &s[3], &s[4], + &s[5], &s[6], &s[7]); + transpose_elems_inplace_u8_8x8(&s[0], &s[1], &s[2], &s[3], &s[4], + &s[5], &s[6], &s[7]); + d[0] = scale_filter_8(s, filters); + vst1_u8(&temp[8 * z], d[0]); + } else { + int i; + for (i = 0; i < 8; ++i) { + temp[z * 8 + i] = src_x[i * src_stride + 3]; + } + } + x_q4 += x_step_q4; + } + + // transpose the 8x8 filters values back to dst + load_u8_8x8(temp, 8, &d[0], &d[1], &d[2], &d[3], &d[4], &d[5], &d[6], + &d[7]); + transpose_elems_inplace_u8_8x8(&d[0], &d[1], &d[2], &d[3], &d[4], &d[5], + &d[6], &d[7]); + store_u8_8x8(dst + x, dst_stride, d[0], d[1], d[2], d[3], d[4], d[5], + d[6], d[7]); + x += 8; + } while (x < w); + + src += src_stride * 8; + dst += dst_stride * 8; + } while (y -= 8); +} + +static INLINE void scaledconvolve_vert_w4( + const uint8_t *src, const ptrdiff_t src_stride, uint8_t *dst, + const ptrdiff_t dst_stride, const InterpKernel *const y_filters, + const int y0_q4, const int y_step_q4, const int w, const int h) { + int y; + int y_q4 = y0_q4; + + src -= src_stride * (SUBPEL_TAPS / 2 - 1); + y = h; + do { + const unsigned char *src_y = &src[(y_q4 >> SUBPEL_BITS) * src_stride]; + + if (y_q4 & SUBPEL_MASK) { + const int16x8_t filters = vld1q_s16(y_filters[y_q4 & SUBPEL_MASK]); + uint8x8_t s[8], d; + int16x4_t t[8], tt; + + load_u8_8x8(src_y, src_stride, &s[0], &s[1], &s[2], &s[3], &s[4], &s[5], + &s[6], &s[7]); + t[0] = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(s[0]))); + t[1] = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(s[1]))); + t[2] = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(s[2]))); + t[3] = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(s[3]))); + t[4] = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(s[4]))); + t[5] = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(s[5]))); + t[6] = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(s[6]))); + t[7] = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(s[7]))); + + tt = convolve8_4(t[0], t[1], t[2], t[3], t[4], t[5], t[6], t[7], filters); + d = vqrshrun_n_s16(vcombine_s16(tt, tt), 7); + store_u8_4x1(dst, d); + } else { + memcpy(dst, &src_y[3 * src_stride], w); + } + + dst += dst_stride; + y_q4 += y_step_q4; + } while (--y); +} + +static INLINE void scaledconvolve_vert_w8( + const uint8_t *src, const ptrdiff_t src_stride, uint8_t *dst, + const ptrdiff_t dst_stride, const InterpKernel *const y_filters, + const int y0_q4, const int y_step_q4, const int w, const int h) { + int y; + int y_q4 = y0_q4; + + src -= src_stride * (SUBPEL_TAPS / 2 - 1); + y = h; + do { + const unsigned char *src_y = &src[(y_q4 >> SUBPEL_BITS) * src_stride]; + if (y_q4 & SUBPEL_MASK) { + const int16x8_t filters = vld1q_s16(y_filters[y_q4 & SUBPEL_MASK]); + uint8x8_t s[8], d; + load_u8_8x8(src_y, src_stride, &s[0], &s[1], &s[2], &s[3], &s[4], &s[5], + &s[6], &s[7]); + d = scale_filter_8(s, filters); + vst1_u8(dst, d); + } else { + memcpy(dst, &src_y[3 * src_stride], w); + } + dst += dst_stride; + y_q4 += y_step_q4; + } while (--y); +} + +static INLINE void scaledconvolve_vert_w16( + const uint8_t *src, const ptrdiff_t src_stride, uint8_t *dst, + const ptrdiff_t dst_stride, const InterpKernel *const y_filters, + const int y0_q4, const int y_step_q4, const int w, const int h) { + int x, y; + int y_q4 = y0_q4; + + src -= src_stride * (SUBPEL_TAPS / 2 - 1); + y = h; + do { + const unsigned char *src_y = &src[(y_q4 >> SUBPEL_BITS) * src_stride]; + if (y_q4 & SUBPEL_MASK) { + x = 0; + do { + const int16x8_t filters = vld1q_s16(y_filters[y_q4 & SUBPEL_MASK]); + uint8x16_t ss[8]; + uint8x8_t s[8], d[2]; + load_u8_16x8(src_y, src_stride, &ss[0], &ss[1], &ss[2], &ss[3], &ss[4], + &ss[5], &ss[6], &ss[7]); + s[0] = vget_low_u8(ss[0]); + s[1] = vget_low_u8(ss[1]); + s[2] = vget_low_u8(ss[2]); + s[3] = vget_low_u8(ss[3]); + s[4] = vget_low_u8(ss[4]); + s[5] = vget_low_u8(ss[5]); + s[6] = vget_low_u8(ss[6]); + s[7] = vget_low_u8(ss[7]); + d[0] = scale_filter_8(s, filters); + + s[0] = vget_high_u8(ss[0]); + s[1] = vget_high_u8(ss[1]); + s[2] = vget_high_u8(ss[2]); + s[3] = vget_high_u8(ss[3]); + s[4] = vget_high_u8(ss[4]); + s[5] = vget_high_u8(ss[5]); + s[6] = vget_high_u8(ss[6]); + s[7] = vget_high_u8(ss[7]); + d[1] = scale_filter_8(s, filters); + vst1q_u8(&dst[x], vcombine_u8(d[0], d[1])); + src_y += 16; + x += 16; + } while (x < w); + } else { + memcpy(dst, &src_y[3 * src_stride], w); + } + dst += dst_stride; + y_q4 += y_step_q4; + } while (--y); +} + +void aom_scaled_2d_neon(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst, + ptrdiff_t dst_stride, const InterpKernel *filter, + int x0_q4, int x_step_q4, int y0_q4, int y_step_q4, + int w, int h) { + // Note: Fixed size intermediate buffer, temp, places limits on parameters. + // 2d filtering proceeds in 2 steps: + // (1) Interpolate horizontally into an intermediate buffer, temp. + // (2) Interpolate temp vertically to derive the sub-pixel result. + // Deriving the maximum number of rows in the temp buffer (135): + // --Smallest scaling factor is x1/2 ==> y_step_q4 = 32 (Normative). + // --Largest block size is 64x64 pixels. + // --64 rows in the downscaled frame span a distance of (64 - 1) * 32 in the + // original frame (in 1/16th pixel units). + // --Must round-up because block may be located at sub-pixel position. + // --Require an additional SUBPEL_TAPS rows for the 8-tap filter tails. + // --((64 - 1) * 32 + 15) >> 4 + 8 = 135. + // --Require an additional 8 rows for the horiz_w8 transpose tail. + // When calling in frame scaling function, the smallest scaling factor is x1/4 + // ==> y_step_q4 = 64. Since w and h are at most 16, the temp buffer is still + // big enough. + DECLARE_ALIGNED(16, uint8_t, temp[(135 + 8) * 64]); + const int intermediate_height = + (((h - 1) * y_step_q4 + y0_q4) >> SUBPEL_BITS) + SUBPEL_TAPS; + + assert(w <= 64); + assert(h <= 64); + assert(y_step_q4 <= 32 || (y_step_q4 <= 64 && h <= 32)); + assert(x_step_q4 <= 64); + + if (w >= 8) { + scaledconvolve_horiz_w8(src - src_stride * (SUBPEL_TAPS / 2 - 1), + src_stride, temp, 64, filter, x0_q4, x_step_q4, w, + intermediate_height); + } else { + scaledconvolve_horiz_w4(src - src_stride * (SUBPEL_TAPS / 2 - 1), + src_stride, temp, 64, filter, x0_q4, x_step_q4, w, + intermediate_height); + } + + if (w >= 16) { + scaledconvolve_vert_w16(temp + 64 * (SUBPEL_TAPS / 2 - 1), 64, dst, + dst_stride, filter, y0_q4, y_step_q4, w, h); + } else if (w == 8) { + scaledconvolve_vert_w8(temp + 64 * (SUBPEL_TAPS / 2 - 1), 64, dst, + dst_stride, filter, y0_q4, y_step_q4, w, h); + } else { + scaledconvolve_vert_w4(temp + 64 * (SUBPEL_TAPS / 2 - 1), 64, dst, + dst_stride, filter, y0_q4, y_step_q4, w, h); + } +} |