110 lines
3.7 KiB
C
110 lines
3.7 KiB
C
/*
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* Copyright (c) 2015 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 "vp8/common/alloccommon.h"
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#include "vp8/common/vp8_skin_detection.h"
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#include "vpx_dsp/vpx_dsp_common.h"
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#include "vpx_mem/vpx_mem.h"
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#include "vpx_util/vpx_write_yuv_frame.h"
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static int avg_2x2(const uint8_t *s, int p) {
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int i, j;
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int sum = 0;
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for (i = 0; i < 2; ++i, s += p) {
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for (j = 0; j < 2; ++j) {
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sum += s[j];
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}
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}
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return (sum + 2) >> 2;
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}
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int vp8_compute_skin_block(const uint8_t *y, const uint8_t *u, const uint8_t *v,
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int stride, int strideuv,
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SKIN_DETECTION_BLOCK_SIZE bsize, int consec_zeromv,
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int curr_motion_magn) {
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// No skin if block has been zero/small motion for long consecutive time.
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if (consec_zeromv > 60 && curr_motion_magn == 0) {
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return 0;
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} else {
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int motion = 1;
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if (consec_zeromv > 25 && curr_motion_magn == 0) motion = 0;
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if (bsize == SKIN_16X16) {
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// Take the average of center 2x2 pixels.
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const int ysource = avg_2x2(y + 7 * stride + 7, stride);
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const int usource = avg_2x2(u + 3 * strideuv + 3, strideuv);
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const int vsource = avg_2x2(v + 3 * strideuv + 3, strideuv);
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return vpx_skin_pixel(ysource, usource, vsource, motion);
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} else {
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int num_skin = 0;
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int i, j;
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for (i = 0; i < 2; i++) {
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for (j = 0; j < 2; j++) {
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// Take the average of center 2x2 pixels.
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const int ysource = avg_2x2(y + 3 * stride + 3, stride);
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const int usource = avg_2x2(u + strideuv + 1, strideuv);
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const int vsource = avg_2x2(v + strideuv + 1, strideuv);
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num_skin += vpx_skin_pixel(ysource, usource, vsource, motion);
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if (num_skin >= 2) return 1;
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y += 8;
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u += 4;
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v += 4;
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}
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y += (stride << 3) - 16;
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u += (strideuv << 2) - 8;
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v += (strideuv << 2) - 8;
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}
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return 0;
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}
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}
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}
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#ifdef OUTPUT_YUV_SKINMAP
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// For viewing skin map on input source.
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void vp8_compute_skin_map(VP8_COMP *const cpi, FILE *yuv_skinmap_file) {
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int i, j, mb_row, mb_col, num_bl;
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VP8_COMMON *const cm = &cpi->common;
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uint8_t *y;
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const uint8_t *src_y = cpi->Source->y_buffer;
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const int src_ystride = cpi->Source->y_stride;
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int offset = 0;
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YV12_BUFFER_CONFIG skinmap;
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memset(&skinmap, 0, sizeof(skinmap));
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if (vp8_yv12_alloc_frame_buffer(&skinmap, cm->Width, cm->Height,
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VP8BORDERINPIXELS) < 0) {
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vpx_free_frame_buffer(&skinmap);
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return;
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}
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memset(skinmap.buffer_alloc, 128, skinmap.frame_size);
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y = skinmap.y_buffer;
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// Loop through blocks and set skin map based on center pixel of block.
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// Set y to white for skin block, otherwise set to source with gray scale.
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for (mb_row = 0; mb_row < cm->mb_rows; mb_row += 1) {
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num_bl = 0;
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for (mb_col = 0; mb_col < cm->mb_cols; mb_col += 1) {
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const int is_skin = cpi->skin_map[offset++];
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for (i = 0; i < 16; i++) {
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for (j = 0; j < 16; j++) {
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y[i * src_ystride + j] = is_skin ? 255 : src_y[i * src_ystride + j];
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}
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}
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num_bl++;
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y += 16;
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src_y += 16;
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}
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y += (src_ystride << 4) - (num_bl << 4);
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src_y += (src_ystride << 4) - (num_bl << 4);
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}
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vpx_write_yuv_frame(yuv_skinmap_file, &skinmap);
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vpx_free_frame_buffer(&skinmap);
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}
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#endif // OUTPUT_YUV_SKINMAP
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