1 files changed, 78 insertions, 0 deletions
diff --git a/third_party/aom/av1/decoder/detokenize.c b/third_party/aom/av1/decoder/detokenize.c
new file mode 100644
index 0000000000..9d54bd13dd
--- /dev/null
+++ b/third_party/aom/av1/decoder/detokenize.c
@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#include "config/aom_config.h"
+
+#include "aom_mem/aom_mem.h"
+#include "aom_ports/mem.h"
+#include "av1/common/blockd.h"
+#include "av1/decoder/detokenize.h"
+
+#define ACCT_STR __func__
+
+#include "av1/common/common.h"
+#include "av1/common/entropy.h"
+#include "av1/common/idct.h"
+
+static void decode_color_map_tokens(Av1ColorMapParam *param, aom_reader *r) {
+  uint8_t color_order[PALETTE_MAX_SIZE];
+  const int n = param->n_colors;
+  uint8_t *const color_map = param->color_map;
+  MapCdf color_map_cdf = param->map_cdf;
+  int plane_block_width = param->plane_width;
+  int plane_block_height = param->plane_height;
+  int rows = param->rows;
+  int cols = param->cols;
+
+  // The first color index.
+  color_map[0] = av1_read_uniform(r, n);
+  assert(color_map[0] < n);
+
+  // Run wavefront on the palette map index decoding.
+  for (int i = 1; i < rows + cols - 1; ++i) {
+    for (int j = AOMMIN(i, cols - 1); j >= AOMMAX(0, i - rows + 1); --j) {
+      const int color_ctx = av1_get_palette_color_index_context(
+          color_map, plane_block_width, (i - j), j, n, color_order, NULL);
+      const int color_idx = aom_read_symbol(
+          r, color_map_cdf[n - PALETTE_MIN_SIZE][color_ctx], n, ACCT_STR);
+      assert(color_idx >= 0 && color_idx < n);
+      color_map[(i - j) * plane_block_width + j] = color_order[color_idx];
+    }
+  }
+  // Copy last column to extra columns.
+  if (cols < plane_block_width) {
+    for (int i = 0; i < rows; ++i) {
+      memset(color_map + i * plane_block_width + cols,
+             color_map[i * plane_block_width + cols - 1],
+             (plane_block_width - cols));
+    }
+  }
+  // Copy last row to extra rows.
+  for (int i = rows; i < plane_block_height; ++i) {
+    memcpy(color_map + i * plane_block_width,
+           color_map + (rows - 1) * plane_block_width, plane_block_width);
+  }
+}
+
+void av1_decode_palette_tokens(MACROBLOCKD *const xd, int plane,
+                               aom_reader *r) {
+  assert(plane == 0 || plane == 1);
+  Av1ColorMapParam params;
+  params.color_map =
+      xd->plane[plane].color_index_map + xd->color_index_map_offset[plane];
+  params.map_cdf = plane ? xd->tile_ctx->palette_uv_color_index_cdf
+                         : xd->tile_ctx->palette_y_color_index_cdf;
+  const MB_MODE_INFO *const mbmi = xd->mi[0];
+  params.n_colors = mbmi->palette_mode_info.palette_size[plane];
+  av1_get_block_dimensions(mbmi->sb_type, plane, xd, &params.plane_width,
+                           &params.plane_height, &params.rows, &params.cols);
+  decode_color_map_tokens(&params, r);
+}