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-rw-r--r--media/libaom/src/av1/decoder/detokenize.c78
1 files changed, 78 insertions, 0 deletions
diff --git a/media/libaom/src/av1/decoder/detokenize.c b/media/libaom/src/av1/decoder/detokenize.c
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+++ b/media/libaom/src/av1/decoder/detokenize.c
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+/*
+ * 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);
+}