1 /*
2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved
3 *
4 * This source code is subject to the terms of the BSD 2 Clause License and
5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
6 * was not distributed with this source code in the LICENSE file, you can
7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
8 * Media Patent License 1.0 was not distributed with this source code in the
9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
10 */
11
12 #include "config/aom_config.h"
13
14 #include "aom_mem/aom_mem.h"
15 #include "aom_ports/mem.h"
16 #include "av1/common/blockd.h"
17 #include "av1/decoder/detokenize.h"
18
19 #define ACCT_STR __func__
20
21 #include "av1/common/common.h"
22 #include "av1/common/entropy.h"
23 #include "av1/common/idct.h"
24
decode_color_map_tokens(Av1ColorMapParam * param,aom_reader * r)25 static void decode_color_map_tokens(Av1ColorMapParam *param, aom_reader *r) {
26 uint8_t color_order[PALETTE_MAX_SIZE];
27 const int n = param->n_colors;
28 uint8_t *const color_map = param->color_map;
29 MapCdf color_map_cdf = param->map_cdf;
30 int plane_block_width = param->plane_width;
31 int plane_block_height = param->plane_height;
32 int rows = param->rows;
33 int cols = param->cols;
34
35 // The first color index.
36 color_map[0] = av1_read_uniform(r, n);
37 assert(color_map[0] < n);
38
39 // Run wavefront on the palette map index decoding.
40 for (int i = 1; i < rows + cols - 1; ++i) {
41 for (int j = AOMMIN(i, cols - 1); j >= AOMMAX(0, i - rows + 1); --j) {
42 const int color_ctx = av1_get_palette_color_index_context(
43 color_map, plane_block_width, (i - j), j, n, color_order, NULL);
44 const int color_idx = aom_read_symbol(
45 r, color_map_cdf[n - PALETTE_MIN_SIZE][color_ctx], n, ACCT_STR);
46 assert(color_idx >= 0 && color_idx < n);
47 color_map[(i - j) * plane_block_width + j] = color_order[color_idx];
48 }
49 }
50 // Copy last column to extra columns.
51 if (cols < plane_block_width) {
52 for (int i = 0; i < rows; ++i) {
53 memset(color_map + i * plane_block_width + cols,
54 color_map[i * plane_block_width + cols - 1],
55 (plane_block_width - cols));
56 }
57 }
58 // Copy last row to extra rows.
59 for (int i = rows; i < plane_block_height; ++i) {
60 memcpy(color_map + i * plane_block_width,
61 color_map + (rows - 1) * plane_block_width, plane_block_width);
62 }
63 }
64
av1_decode_palette_tokens(MACROBLOCKD * const xd,int plane,aom_reader * r)65 void av1_decode_palette_tokens(MACROBLOCKD *const xd, int plane,
66 aom_reader *r) {
67 assert(plane == 0 || plane == 1);
68 Av1ColorMapParam params;
69 params.color_map =
70 xd->plane[plane].color_index_map + xd->color_index_map_offset[plane];
71 params.map_cdf = plane ? xd->tile_ctx->palette_uv_color_index_cdf
72 : xd->tile_ctx->palette_y_color_index_cdf;
73 const MB_MODE_INFO *const mbmi = xd->mi[0];
74 params.n_colors = mbmi->palette_mode_info.palette_size[plane];
75 av1_get_block_dimensions(mbmi->bsize, plane, xd, ¶ms.plane_width,
76 ¶ms.plane_height, ¶ms.rows, ¶ms.cols);
77 decode_color_map_tokens(¶ms, r);
78 }
79