1 files changed, 109 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vp8/common/vp8_skin_detection.c b/media/libvpx/libvpx/vp8/common/vp8_skin_detection.c
new file mode 100644
index 0000000000..6739efa5fe
--- /dev/null
+++ b/media/libvpx/libvpx/vp8/common/vp8_skin_detection.c
@@ -0,0 +1,109 @@
+/*
+ *  Copyright (c) 2015 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 "vp8/common/alloccommon.h"
+#include "vp8/common/vp8_skin_detection.h"
+#include "vpx_dsp/vpx_dsp_common.h"
+#include "vpx_mem/vpx_mem.h"
+#include "vpx_util/vpx_write_yuv_frame.h"
+
+static int avg_2x2(const uint8_t *s, int p) {
+  int i, j;
+  int sum = 0;
+  for (i = 0; i < 2; ++i, s += p) {
+    for (j = 0; j < 2; ++j) {
+      sum += s[j];
+    }
+  }
+  return (sum + 2) >> 2;
+}
+
+int vp8_compute_skin_block(const uint8_t *y, const uint8_t *u, const uint8_t *v,
+                           int stride, int strideuv,
+                           SKIN_DETECTION_BLOCK_SIZE bsize, int consec_zeromv,
+                           int curr_motion_magn) {
+  // No skin if block has been zero/small motion for long consecutive time.
+  if (consec_zeromv > 60 && curr_motion_magn == 0) {
+    return 0;
+  } else {
+    int motion = 1;
+    if (consec_zeromv > 25 && curr_motion_magn == 0) motion = 0;
+    if (bsize == SKIN_16X16) {
+      // Take the average of center 2x2 pixels.
+      const int ysource = avg_2x2(y + 7 * stride + 7, stride);
+      const int usource = avg_2x2(u + 3 * strideuv + 3, strideuv);
+      const int vsource = avg_2x2(v + 3 * strideuv + 3, strideuv);
+      return vpx_skin_pixel(ysource, usource, vsource, motion);
+    } else {
+      int num_skin = 0;
+      int i, j;
+      for (i = 0; i < 2; i++) {
+        for (j = 0; j < 2; j++) {
+          // Take the average of center 2x2 pixels.
+          const int ysource = avg_2x2(y + 3 * stride + 3, stride);
+          const int usource = avg_2x2(u + strideuv + 1, strideuv);
+          const int vsource = avg_2x2(v + strideuv + 1, strideuv);
+          num_skin += vpx_skin_pixel(ysource, usource, vsource, motion);
+          if (num_skin >= 2) return 1;
+          y += 8;
+          u += 4;
+          v += 4;
+        }
+        y += (stride << 3) - 16;
+        u += (strideuv << 2) - 8;
+        v += (strideuv << 2) - 8;
+      }
+
+      return 0;
+    }
+  }
+}
+
+#ifdef OUTPUT_YUV_SKINMAP
+// For viewing skin map on input source.
+void vp8_compute_skin_map(VP8_COMP *const cpi, FILE *yuv_skinmap_file) {
+  int i, j, mb_row, mb_col, num_bl;
+  VP8_COMMON *const cm = &cpi->common;
+  uint8_t *y;
+  const uint8_t *src_y = cpi->Source->y_buffer;
+  const int src_ystride = cpi->Source->y_stride;
+  int offset = 0;
+
+  YV12_BUFFER_CONFIG skinmap;
+  memset(&skinmap, 0, sizeof(skinmap));
+  if (vp8_yv12_alloc_frame_buffer(&skinmap, cm->Width, cm->Height,
+                                  VP8BORDERINPIXELS) < 0) {
+    vpx_free_frame_buffer(&skinmap);
+    return;
+  }
+  memset(skinmap.buffer_alloc, 128, skinmap.frame_size);
+  y = skinmap.y_buffer;
+  // Loop through blocks and set skin map based on center pixel of block.
+  // Set y to white for skin block, otherwise set to source with gray scale.
+  for (mb_row = 0; mb_row < cm->mb_rows; mb_row += 1) {
+    num_bl = 0;
+    for (mb_col = 0; mb_col < cm->mb_cols; mb_col += 1) {
+      const int is_skin = cpi->skin_map[offset++];
+      for (i = 0; i < 16; i++) {
+        for (j = 0; j < 16; j++) {
+          y[i * src_ystride + j] = is_skin ? 255 : src_y[i * src_ystride + j];
+        }
+      }
+      num_bl++;
+      y += 16;
+      src_y += 16;
+    }
+    y += (src_ystride << 4) - (num_bl << 4);
+    src_y += (src_ystride << 4) - (num_bl << 4);
+  }
+  vpx_write_yuv_frame(yuv_skinmap_file, &skinmap);
+  vpx_free_frame_buffer(&skinmap);
+}
+#endif  // OUTPUT_YUV_SKINMAP