325 lines
12 KiB
C
325 lines
12 KiB
C
/*
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* Copyright (c) 2017 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <arm_neon.h>
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#include <assert.h>
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#include <string.h>
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#include "./vpx_config.h"
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#include "./vpx_dsp_rtcd.h"
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#include "vpx/vpx_integer.h"
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#include "vpx_dsp/arm/transpose_neon.h"
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#include "vpx_dsp/arm/vpx_convolve8_neon.h"
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#include "vpx_ports/mem.h"
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static INLINE void scaledconvolve_horiz_w4(
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const uint8_t *src, const ptrdiff_t src_stride, uint8_t *dst,
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const ptrdiff_t dst_stride, const InterpKernel *const x_filters,
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const int x0_q4, const int x_step_q4, const int w, const int h) {
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DECLARE_ALIGNED(16, uint8_t, temp[4 * 4]);
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int x, y, z;
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src -= SUBPEL_TAPS / 2 - 1;
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y = h;
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do {
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int x_q4 = x0_q4;
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x = 0;
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do {
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// process 4 src_x steps
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for (z = 0; z < 4; ++z) {
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const uint8_t *const src_x = &src[x_q4 >> SUBPEL_BITS];
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if (x_q4 & SUBPEL_MASK) {
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const int16x8_t filters = vld1q_s16(x_filters[x_q4 & SUBPEL_MASK]);
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const int16x4_t filter3 = vdup_lane_s16(vget_low_s16(filters), 3);
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const int16x4_t filter4 = vdup_lane_s16(vget_high_s16(filters), 0);
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uint8x8_t s[8], d;
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int16x8_t ss[4];
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int16x4_t t[8], tt;
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load_u8_8x4(src_x, src_stride, &s[0], &s[1], &s[2], &s[3]);
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transpose_u8_8x4(&s[0], &s[1], &s[2], &s[3]);
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ss[0] = vreinterpretq_s16_u16(vmovl_u8(s[0]));
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ss[1] = vreinterpretq_s16_u16(vmovl_u8(s[1]));
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ss[2] = vreinterpretq_s16_u16(vmovl_u8(s[2]));
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ss[3] = vreinterpretq_s16_u16(vmovl_u8(s[3]));
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t[0] = vget_low_s16(ss[0]);
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t[1] = vget_low_s16(ss[1]);
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t[2] = vget_low_s16(ss[2]);
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t[3] = vget_low_s16(ss[3]);
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t[4] = vget_high_s16(ss[0]);
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t[5] = vget_high_s16(ss[1]);
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t[6] = vget_high_s16(ss[2]);
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t[7] = vget_high_s16(ss[3]);
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tt = convolve8_4(t[0], t[1], t[2], t[3], t[4], t[5], t[6], t[7],
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filters, filter3, filter4);
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d = vqrshrun_n_s16(vcombine_s16(tt, tt), 7);
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vst1_lane_u32((uint32_t *)&temp[4 * z], vreinterpret_u32_u8(d), 0);
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} else {
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int i;
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for (i = 0; i < 4; ++i) {
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temp[z * 4 + i] = src_x[i * src_stride + 3];
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}
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}
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x_q4 += x_step_q4;
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}
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// transpose the 4x4 filters values back to dst
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{
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const uint8x8x4_t d4 = vld4_u8(temp);
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vst1_lane_u32((uint32_t *)&dst[x + 0 * dst_stride],
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vreinterpret_u32_u8(d4.val[0]), 0);
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vst1_lane_u32((uint32_t *)&dst[x + 1 * dst_stride],
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vreinterpret_u32_u8(d4.val[1]), 0);
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vst1_lane_u32((uint32_t *)&dst[x + 2 * dst_stride],
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vreinterpret_u32_u8(d4.val[2]), 0);
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vst1_lane_u32((uint32_t *)&dst[x + 3 * dst_stride],
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vreinterpret_u32_u8(d4.val[3]), 0);
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}
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x += 4;
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} while (x < w);
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src += src_stride * 4;
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dst += dst_stride * 4;
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y -= 4;
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} while (y > 0);
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}
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static INLINE void scaledconvolve_horiz_w8(
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const uint8_t *src, const ptrdiff_t src_stride, uint8_t *dst,
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const ptrdiff_t dst_stride, const InterpKernel *const x_filters,
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const int x0_q4, const int x_step_q4, const int w, const int h) {
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DECLARE_ALIGNED(16, uint8_t, temp[8 * 8]);
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int x, y, z;
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src -= SUBPEL_TAPS / 2 - 1;
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// This function processes 8x8 areas. The intermediate height is not always
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// a multiple of 8, so force it to be a multiple of 8 here.
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y = (h + 7) & ~7;
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do {
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int x_q4 = x0_q4;
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x = 0;
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do {
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uint8x8_t d[8];
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// process 8 src_x steps
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for (z = 0; z < 8; ++z) {
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const uint8_t *const src_x = &src[x_q4 >> SUBPEL_BITS];
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if (x_q4 & SUBPEL_MASK) {
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const int16x8_t filters = vld1q_s16(x_filters[x_q4 & SUBPEL_MASK]);
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uint8x8_t s[8];
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load_u8_8x8(src_x, src_stride, &s[0], &s[1], &s[2], &s[3], &s[4],
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&s[5], &s[6], &s[7]);
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transpose_u8_8x8(&s[0], &s[1], &s[2], &s[3], &s[4], &s[5], &s[6],
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&s[7]);
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d[0] = scale_filter_8(s, filters);
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vst1_u8(&temp[8 * z], d[0]);
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} else {
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int i;
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for (i = 0; i < 8; ++i) {
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temp[z * 8 + i] = src_x[i * src_stride + 3];
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}
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}
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x_q4 += x_step_q4;
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}
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// transpose the 8x8 filters values back to dst
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load_u8_8x8(temp, 8, &d[0], &d[1], &d[2], &d[3], &d[4], &d[5], &d[6],
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&d[7]);
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transpose_u8_8x8(&d[0], &d[1], &d[2], &d[3], &d[4], &d[5], &d[6], &d[7]);
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vst1_u8(&dst[x + 0 * dst_stride], d[0]);
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vst1_u8(&dst[x + 1 * dst_stride], d[1]);
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vst1_u8(&dst[x + 2 * dst_stride], d[2]);
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vst1_u8(&dst[x + 3 * dst_stride], d[3]);
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vst1_u8(&dst[x + 4 * dst_stride], d[4]);
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vst1_u8(&dst[x + 5 * dst_stride], d[5]);
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vst1_u8(&dst[x + 6 * dst_stride], d[6]);
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vst1_u8(&dst[x + 7 * dst_stride], d[7]);
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x += 8;
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} while (x < w);
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src += src_stride * 8;
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dst += dst_stride * 8;
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} while (y -= 8);
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}
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static INLINE void scaledconvolve_vert_w4(
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const uint8_t *src, const ptrdiff_t src_stride, uint8_t *dst,
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const ptrdiff_t dst_stride, const InterpKernel *const y_filters,
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const int y0_q4, const int y_step_q4, const int w, const int h) {
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int y;
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int y_q4 = y0_q4;
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src -= src_stride * (SUBPEL_TAPS / 2 - 1);
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y = h;
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do {
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const unsigned char *src_y = &src[(y_q4 >> SUBPEL_BITS) * src_stride];
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if (y_q4 & SUBPEL_MASK) {
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const int16x8_t filters = vld1q_s16(y_filters[y_q4 & SUBPEL_MASK]);
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const int16x4_t filter3 = vdup_lane_s16(vget_low_s16(filters), 3);
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const int16x4_t filter4 = vdup_lane_s16(vget_high_s16(filters), 0);
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uint8x8_t s[8], d;
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int16x4_t t[8], tt;
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load_u8_8x8(src_y, src_stride, &s[0], &s[1], &s[2], &s[3], &s[4], &s[5],
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&s[6], &s[7]);
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t[0] = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(s[0])));
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t[1] = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(s[1])));
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t[2] = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(s[2])));
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t[3] = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(s[3])));
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t[4] = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(s[4])));
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t[5] = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(s[5])));
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t[6] = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(s[6])));
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t[7] = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(s[7])));
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tt = convolve8_4(t[0], t[1], t[2], t[3], t[4], t[5], t[6], t[7], filters,
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filter3, filter4);
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d = vqrshrun_n_s16(vcombine_s16(tt, tt), 7);
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vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(d), 0);
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} else {
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memcpy(dst, &src_y[3 * src_stride], w);
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}
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dst += dst_stride;
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y_q4 += y_step_q4;
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} while (--y);
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}
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static INLINE void scaledconvolve_vert_w8(
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const uint8_t *src, const ptrdiff_t src_stride, uint8_t *dst,
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const ptrdiff_t dst_stride, const InterpKernel *const y_filters,
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const int y0_q4, const int y_step_q4, const int w, const int h) {
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int y;
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int y_q4 = y0_q4;
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src -= src_stride * (SUBPEL_TAPS / 2 - 1);
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y = h;
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do {
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const unsigned char *src_y = &src[(y_q4 >> SUBPEL_BITS) * src_stride];
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if (y_q4 & SUBPEL_MASK) {
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const int16x8_t filters = vld1q_s16(y_filters[y_q4 & SUBPEL_MASK]);
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uint8x8_t s[8], d;
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load_u8_8x8(src_y, src_stride, &s[0], &s[1], &s[2], &s[3], &s[4], &s[5],
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&s[6], &s[7]);
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d = scale_filter_8(s, filters);
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vst1_u8(dst, d);
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} else {
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memcpy(dst, &src_y[3 * src_stride], w);
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}
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dst += dst_stride;
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y_q4 += y_step_q4;
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} while (--y);
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}
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static INLINE void scaledconvolve_vert_w16(
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const uint8_t *src, const ptrdiff_t src_stride, uint8_t *dst,
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const ptrdiff_t dst_stride, const InterpKernel *const y_filters,
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const int y0_q4, const int y_step_q4, const int w, const int h) {
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int x, y;
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int y_q4 = y0_q4;
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src -= src_stride * (SUBPEL_TAPS / 2 - 1);
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y = h;
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do {
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const unsigned char *src_y = &src[(y_q4 >> SUBPEL_BITS) * src_stride];
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if (y_q4 & SUBPEL_MASK) {
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x = 0;
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do {
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const int16x8_t filters = vld1q_s16(y_filters[y_q4 & SUBPEL_MASK]);
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uint8x16_t ss[8];
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uint8x8_t s[8], d[2];
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load_u8_16x8(src_y, src_stride, &ss[0], &ss[1], &ss[2], &ss[3], &ss[4],
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&ss[5], &ss[6], &ss[7]);
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s[0] = vget_low_u8(ss[0]);
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s[1] = vget_low_u8(ss[1]);
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s[2] = vget_low_u8(ss[2]);
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s[3] = vget_low_u8(ss[3]);
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s[4] = vget_low_u8(ss[4]);
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s[5] = vget_low_u8(ss[5]);
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s[6] = vget_low_u8(ss[6]);
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s[7] = vget_low_u8(ss[7]);
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d[0] = scale_filter_8(s, filters);
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s[0] = vget_high_u8(ss[0]);
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s[1] = vget_high_u8(ss[1]);
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s[2] = vget_high_u8(ss[2]);
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s[3] = vget_high_u8(ss[3]);
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s[4] = vget_high_u8(ss[4]);
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s[5] = vget_high_u8(ss[5]);
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s[6] = vget_high_u8(ss[6]);
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s[7] = vget_high_u8(ss[7]);
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d[1] = scale_filter_8(s, filters);
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vst1q_u8(&dst[x], vcombine_u8(d[0], d[1]));
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src_y += 16;
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x += 16;
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} while (x < w);
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} else {
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memcpy(dst, &src_y[3 * src_stride], w);
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}
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dst += dst_stride;
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y_q4 += y_step_q4;
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} while (--y);
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}
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void vpx_scaled_2d_neon(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst,
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ptrdiff_t dst_stride, const InterpKernel *filter,
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int x0_q4, int x_step_q4, int y0_q4, int y_step_q4,
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int w, int h) {
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// Note: Fixed size intermediate buffer, temp, places limits on parameters.
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// 2d filtering proceeds in 2 steps:
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// (1) Interpolate horizontally into an intermediate buffer, temp.
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// (2) Interpolate temp vertically to derive the sub-pixel result.
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// Deriving the maximum number of rows in the temp buffer (135):
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// --Smallest scaling factor is x1/2 ==> y_step_q4 = 32 (Normative).
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// --Largest block size is 64x64 pixels.
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// --64 rows in the downscaled frame span a distance of (64 - 1) * 32 in the
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// original frame (in 1/16th pixel units).
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// --Must round-up because block may be located at sub-pixel position.
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// --Require an additional SUBPEL_TAPS rows for the 8-tap filter tails.
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// --((64 - 1) * 32 + 15) >> 4 + 8 = 135.
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// --Require an additional 8 rows for the horiz_w8 transpose tail.
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// When calling in frame scaling function, the smallest scaling factor is x1/4
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// ==> y_step_q4 = 64. Since w and h are at most 16, the temp buffer is still
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// big enough.
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DECLARE_ALIGNED(16, uint8_t, temp[(135 + 8) * 64]);
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const int intermediate_height =
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(((h - 1) * y_step_q4 + y0_q4) >> SUBPEL_BITS) + SUBPEL_TAPS;
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assert(w <= 64);
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assert(h <= 64);
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assert(y_step_q4 <= 32 || (y_step_q4 <= 64 && h <= 32));
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assert(x_step_q4 <= 64);
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if (w >= 8) {
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scaledconvolve_horiz_w8(src - src_stride * (SUBPEL_TAPS / 2 - 1),
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src_stride, temp, 64, filter, x0_q4, x_step_q4, w,
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intermediate_height);
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} else {
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scaledconvolve_horiz_w4(src - src_stride * (SUBPEL_TAPS / 2 - 1),
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src_stride, temp, 64, filter, x0_q4, x_step_q4, w,
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intermediate_height);
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}
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if (w >= 16) {
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scaledconvolve_vert_w16(temp + 64 * (SUBPEL_TAPS / 2 - 1), 64, dst,
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dst_stride, filter, y0_q4, y_step_q4, w, h);
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} else if (w == 8) {
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scaledconvolve_vert_w8(temp + 64 * (SUBPEL_TAPS / 2 - 1), 64, dst,
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dst_stride, filter, y0_q4, y_step_q4, w, h);
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} else {
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scaledconvolve_vert_w4(temp + 64 * (SUBPEL_TAPS / 2 - 1), 64, dst,
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dst_stride, filter, y0_q4, y_step_q4, w, h);
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}
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}
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