102 lines
4.0 KiB
C
102 lines
4.0 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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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, 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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// Take the average of center 2x2 pixels.
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const int ysource = (y[7 * stride + 7] + y[7 * stride + 8] +
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y[8 * stride + 7] + y[8 * stride + 8]) >>
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2;
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const int usource = (u[3 * strideuv + 3] + u[3 * strideuv + 4] +
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u[4 * strideuv + 3] + u[4 * strideuv + 4]) >>
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2;
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const int vsource = (v[3 * strideuv + 3] + v[3 * strideuv + 4] +
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v[4 * strideuv + 3] + v[4 * strideuv + 4]) >>
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2;
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if (consec_zeromv > 25 && curr_motion_magn == 0) motion = 0;
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return vpx_skin_pixel(ysource, usource, vsource, motion);
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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 uint8_t *src_u = cpi->Source->u_buffer;
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const uint8_t *src_v = cpi->Source->v_buffer;
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const int src_ystride = cpi->Source->y_stride;
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const int src_uvstride = cpi->Source->uv_stride;
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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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// Ignore rightmost/bottom boundary blocks.
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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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int is_skin = 0;
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int consec_zeromv = 0;
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const int bl_index = mb_row * cm->mb_cols + mb_col;
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const int bl_index1 = bl_index + 1;
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const int bl_index2 = bl_index + cm->mb_cols;
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const int bl_index3 = bl_index2 + 1;
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consec_zeromv = VPXMIN(cpi->consec_zero_last[bl_index],
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VPXMIN(cpi->consec_zero_last[bl_index1],
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VPXMIN(cpi->consec_zero_last[bl_index2],
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cpi->consec_zero_last[bl_index3])));
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is_skin = vp8_compute_skin_block(src_y, src_u, src_v, src_ystride,
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src_uvstride, consec_zeromv, 0);
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for (i = 0; i < 16; i++) {
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for (j = 0; j < 16; j++) {
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if (is_skin)
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y[i * src_ystride + j] = 255;
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else
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y[i * src_ystride + j] = 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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src_u += 8;
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src_v += 8;
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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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src_u += (src_uvstride << 3) - (num_bl << 3);
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src_v += (src_uvstride << 3) - (num_bl << 3);
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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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