diff options
Diffstat (limited to 'media/libvpx/libvpx/vp9/encoder/vp9_frame_scale.c')
| -rw-r--r-- | media/libvpx/libvpx/vp9/encoder/vp9_frame_scale.c | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vp9/encoder/vp9_frame_scale.c b/media/libvpx/libvpx/vp9/encoder/vp9_frame_scale.c new file mode 100644 index 0000000000..c74d523246 --- /dev/null +++ b/media/libvpx/libvpx/vp9/encoder/vp9_frame_scale.c @@ -0,0 +1,136 @@ +/* + * 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_config.h" +#include "./vpx_dsp_rtcd.h" +#include "./vpx_scale_rtcd.h" +#include "vp9/common/vp9_blockd.h" +#include "vp9/encoder/vp9_encoder.h" +#include "vpx/vpx_codec.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; + + // The issue b/311394513 reveals a corner case bug. vpx_scaled_2d() requires + // both x_step_q4 and y_step_q4 are less than or equal to 64. Otherwise, it + // needs to call vp9_scale_and_extend_frame_nonnormative() that supports + // arbitrary scaling. + const int x_step_q4 = 16 * src_w / dst_w; + const int y_step_q4 = 16 * src_h / dst_h; + if (x_step_q4 > 64 || y_step_q4 > 64) { + // This function is only called while cm->bit_depth is VPX_BITS_8. +#if CONFIG_VP9_HIGHBITDEPTH + vp9_scale_and_extend_frame_nonnormative(src, dst, (int)VPX_BITS_8); +#else + vp9_scale_and_extend_frame_nonnormative(src, dst); +#endif // CONFIG_VP9_HIGHBITDEPTH + return; + } + + 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); +} |