ref: 027ead10dc37c0471ebe17962f83077039b07977
dir: /vp9/encoder/vp9_frame_scale.c/
/* * 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 "./vp9_rtcd.h" #include "./vpx_dsp_rtcd.h" #include "./vpx_scale_rtcd.h" #include "vp9/common/vp9_blockd.h" #include "vpx_dsp/vpx_filter.h" #include "vpx_scale/yv12config.h" void vp9_scale_and_extend_frame_c(const YV12_BUFFER_CONFIG *src, YV12_BUFFER_CONFIG *dst, INTERP_FILTER filter_type, int phase_scaler) { const int src_w = src->y_crop_width; const int src_h = src->y_crop_height; const uint8_t *const srcs[3] = { src->y_buffer, src->u_buffer, src->v_buffer }; const int src_strides[3] = { src->y_stride, src->uv_stride, src->uv_stride }; uint8_t *const dsts[3] = { dst->y_buffer, dst->u_buffer, dst->v_buffer }; const int dst_strides[3] = { dst->y_stride, dst->uv_stride, dst->uv_stride }; const InterpKernel *const kernel = vp9_filter_kernels[filter_type]; int x, y, i; #if HAVE_SSSE3 || HAVE_NEON // TODO(linfengz): The 4:3 specialized C code is disabled by default since // it's much slower than the general version which calls vpx_scaled_2d() even // if vpx_scaled_2d() is not optimized. It will only be enabled as a reference // for the platforms which have faster optimization. if (4 * dst->y_crop_width == 3 * src_w && 4 * dst->y_crop_height == 3 * src_h) { // Specialize 4 to 3 scaling. // Example pixel locations. // (O: Original pixel. S: Scaled pixel. X: Overlapped pixel.) // phase_scaler = 0 | phase_scaler = 8 // | // X O S O S O X | O O O O O // | // | // | S S S // | // | // O O O O O | O O O O O // | // S S S S | // | // | // | S S S // O O O O O | O O O O O // | // | // | // S S S S | // | // O O O O O | O O O O O // | S S S // | // | // | // | // X O S O S O X | O O O O O const int dst_ws[3] = { dst->y_crop_width, dst->uv_crop_width, dst->uv_crop_width }; const int dst_hs[3] = { dst->y_crop_height, dst->uv_crop_height, dst->uv_crop_height }; for (i = 0; i < MAX_MB_PLANE; ++i) { const int dst_w = dst_ws[i]; const int dst_h = dst_hs[i]; const int src_stride = src_strides[i]; const int dst_stride = dst_strides[i]; for (y = 0; y < dst_h; y += 3) { for (x = 0; x < dst_w; x += 3) { const uint8_t *src_ptr = srcs[i] + 4 * y / 3 * src_stride + 4 * x / 3; uint8_t *dst_ptr = dsts[i] + y * dst_stride + x; // Must call c function because its optimization doesn't support 3x3. vpx_scaled_2d_c(src_ptr, src_stride, dst_ptr, dst_stride, kernel, phase_scaler, 64 / 3, phase_scaler, 64 / 3, 3, 3); } } } } else #endif { const int dst_w = dst->y_crop_width; const int dst_h = dst->y_crop_height; for (i = 0; i < MAX_MB_PLANE; ++i) { const int factor = (i == 0 || i == 3 ? 1 : 2); const int src_stride = src_strides[i]; const int dst_stride = dst_strides[i]; for (y = 0; y < dst_h; y += 16) { const int y_q4 = y * (16 / factor) * src_h / dst_h + phase_scaler; for (x = 0; x < dst_w; x += 16) { const int x_q4 = x * (16 / factor) * src_w / dst_w + phase_scaler; const uint8_t *src_ptr = srcs[i] + (y / factor) * src_h / dst_h * src_stride + (x / factor) * src_w / dst_w; uint8_t *dst_ptr = dsts[i] + (y / factor) * dst_stride + (x / factor); vpx_scaled_2d(src_ptr, src_stride, dst_ptr, dst_stride, kernel, x_q4 & 0xf, 16 * src_w / dst_w, y_q4 & 0xf, 16 * src_h / dst_h, 16 / factor, 16 / factor); } } } } vpx_extend_frame_borders(dst); }