1 /* 2 * Copyright (c) 2015 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include "vp8/common/alloccommon.h" 12 #include "vp8/common/vp8_skin_detection.h" 13 #include "vpx_dsp/vpx_dsp_common.h" 14 #include "vpx_mem/vpx_mem.h" 15 #include "vpx_util/vpx_write_yuv_frame.h" 16 17 static int avg_2x2(const uint8_t *s, int p) { 18 int i, j; 19 int sum = 0; 20 for (i = 0; i < 2; ++i, s += p) { 21 for (j = 0; j < 2; ++j) { 22 sum += s[j]; 23 } 24 } 25 return (sum + 2) >> 2; 26 } 27 28 int vp8_compute_skin_block(const uint8_t *y, const uint8_t *u, const uint8_t *v, 29 int stride, int strideuv, 30 SKIN_DETECTION_BLOCK_SIZE bsize, int consec_zeromv, 31 int curr_motion_magn) { 32 // No skin if block has been zero/small motion for long consecutive time. 33 if (consec_zeromv > 60 && curr_motion_magn == 0) { 34 return 0; 35 } else { 36 int motion = 1; 37 if (consec_zeromv > 25 && curr_motion_magn == 0) motion = 0; 38 if (bsize == SKIN_16X16) { 39 // Take the average of center 2x2 pixels. 40 const int ysource = avg_2x2(y + 7 * stride + 7, stride); 41 const int usource = avg_2x2(u + 3 * strideuv + 3, strideuv); 42 const int vsource = avg_2x2(v + 3 * strideuv + 3, strideuv); 43 return vpx_skin_pixel(ysource, usource, vsource, motion); 44 } else { 45 int num_skin = 0; 46 int i, j; 47 for (i = 0; i < 2; i++) { 48 for (j = 0; j < 2; j++) { 49 // Take the average of center 2x2 pixels. 50 const int ysource = avg_2x2(y + 3 * stride + 3, stride); 51 const int usource = avg_2x2(u + strideuv + 1, strideuv); 52 const int vsource = avg_2x2(v + strideuv + 1, strideuv); 53 num_skin += vpx_skin_pixel(ysource, usource, vsource, motion); 54 if (num_skin >= 2) return 1; 55 y += 8; 56 u += 4; 57 v += 4; 58 } 59 y += (stride << 3) - 16; 60 u += (strideuv << 2) - 8; 61 v += (strideuv << 2) - 8; 62 } 63 64 return 0; 65 } 66 } 67 } 68 69 #ifdef OUTPUT_YUV_SKINMAP 70 // For viewing skin map on input source. 71 void vp8_compute_skin_map(VP8_COMP *const cpi, FILE *yuv_skinmap_file) { 72 int i, j, mb_row, mb_col, num_bl; 73 VP8_COMMON *const cm = &cpi->common; 74 uint8_t *y; 75 const uint8_t *src_y = cpi->Source->y_buffer; 76 const int src_ystride = cpi->Source->y_stride; 77 int offset = 0; 78 79 YV12_BUFFER_CONFIG skinmap; 80 memset(&skinmap, 0, sizeof(skinmap)); 81 if (vp8_yv12_alloc_frame_buffer(&skinmap, cm->Width, cm->Height, 82 VP8BORDERINPIXELS) < 0) { 83 vpx_free_frame_buffer(&skinmap); 84 return; 85 } 86 memset(skinmap.buffer_alloc, 128, skinmap.frame_size); 87 y = skinmap.y_buffer; 88 // Loop through blocks and set skin map based on center pixel of block. 89 // Set y to white for skin block, otherwise set to source with gray scale. 90 for (mb_row = 0; mb_row < cm->mb_rows; mb_row += 1) { 91 num_bl = 0; 92 for (mb_col = 0; mb_col < cm->mb_cols; mb_col += 1) { 93 const int is_skin = cpi->skin_map[offset++]; 94 for (i = 0; i < 16; i++) { 95 for (j = 0; j < 16; j++) { 96 y[i * src_ystride + j] = is_skin ? 255 : src_y[i * src_ystride + j]; 97 } 98 } 99 num_bl++; 100 y += 16; 101 src_y += 16; 102 } 103 y += (src_ystride << 4) - (num_bl << 4); 104 src_y += (src_ystride << 4) - (num_bl << 4); 105 } 106 vpx_write_yuv_frame(yuv_skinmap_file, &skinmap); 107 vpx_free_frame_buffer(&skinmap); 108 } 109 #endif // OUTPUT_YUV_SKINMAP 110
