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| | 1 | /* |
| | 2 | * Gryphon's Anim Compressor decoder |
| | 3 | * Copyright (c) 2019 Paul B Mahol |
| | 4 | * |
| | 5 | * This file is part of FFmpeg. |
| | 6 | * |
| | 7 | * FFmpeg is free software; you can redistribute it and/or |
| | 8 | * modify it under the terms of the GNU Lesser General Public |
| | 9 | * License as published by the Free Software Foundation; either |
| | 10 | * version 2.1 of the License, or (at your option) any later version. |
| | 11 | * |
| | 12 | * FFmpeg is distributed in the hope that it will be useful, |
| | 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| | 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| | 15 | * Lesser General Public License for more details. |
| | 16 | * |
| | 17 | * You should have received a copy of the GNU Lesser General Public |
| | 18 | * License along with FFmpeg; if not, write to the Free Software |
| | 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| | 20 | */ |
| | 21 | |
| | 22 | #include <stdio.h> |
| | 23 | #include <stdlib.h> |
| | 24 | #include <string.h> |
| | 25 | |
| | 26 | #include "libavutil/imgutils.h" |
| | 27 | #include "libavutil/internal.h" |
| | 28 | #include "libavutil/intreadwrite.h" |
| | 29 | #include "libavutil/mem.h" |
| | 30 | |
| | 31 | #include "avcodec.h" |
| | 32 | #include "bytestream.h" |
| | 33 | #include "internal.h" |
| | 34 | |
| | 35 | typedef struct ARBCContext { |
| | 36 | GetByteContext gb; |
| | 37 | |
| | 38 | AVFrame *prev_frame; |
| | 39 | } ARBCContext; |
| | 40 | |
| | 41 | static void fill_tile4(AVCodecContext *avctx, uint8_t *color, AVFrame *frame) |
| | 42 | { |
| | 43 | ARBCContext *s = avctx->priv_data; |
| | 44 | GetByteContext *gb = &s->gb; |
| | 45 | int nb_tiles = bytestream2_get_le16(gb); |
| | 46 | int h = avctx->height - 1; |
| | 47 | |
| | 48 | for (int i = 0; i < nb_tiles; i++) { |
| | 49 | int y = bytestream2_get_byte(gb); |
| | 50 | int x = bytestream2_get_byte(gb); |
| | 51 | uint16_t mask = bytestream2_get_le16(gb); |
| | 52 | int start_y = y * 4, start_x = x * 4; |
| | 53 | int end_y = start_y + 4, end_x = start_x + 4; |
| | 54 | |
| | 55 | for (int j = start_y; j < end_y; j++) { |
| | 56 | for (int k = start_x; k < end_x; k++) { |
| | 57 | if (mask & 0x8000) { |
| | 58 | if (j >= avctx->height || k >= avctx->width) { |
| | 59 | mask = mask << 1; |
| | 60 | continue; |
| | 61 | } |
| | 62 | frame->data[0][frame->linesize[0] * (h - j) + 3 * k + 0] = color[0]; |
| | 63 | frame->data[0][frame->linesize[0] * (h - j) + 3 * k + 1] = color[1]; |
| | 64 | frame->data[0][frame->linesize[0] * (h - j) + 3 * k + 2] = color[2]; |
| | 65 | } |
| | 66 | mask = mask << 1; |
| | 67 | } |
| | 68 | } |
| | 69 | } |
| | 70 | } |
| | 71 | |
| | 72 | static void fill_tileX(AVCodecContext *avctx, int tile_width, int tile_height, |
| | 73 | uint8_t *color, AVFrame *frame) |
| | 74 | { |
| | 75 | ARBCContext *s = avctx->priv_data; |
| | 76 | GetByteContext *gb = &s->gb; |
| | 77 | const int step_h = tile_height / 4; |
| | 78 | const int step_w = tile_width / 4; |
| | 79 | int nb_tiles = bytestream2_get_le16(gb); |
| | 80 | int h = avctx->height - 1; |
| | 81 | |
| | 82 | for (int i = 0; i < nb_tiles; i++) { |
| | 83 | int y = bytestream2_get_byte(gb); |
| | 84 | int x = bytestream2_get_byte(gb); |
| | 85 | uint16_t mask = bytestream2_get_le16(gb); |
| | 86 | int start_y = y * tile_height, start_x = x * tile_width; |
| | 87 | int end_y = start_y + tile_height, end_x = start_x + tile_width; |
| | 88 | |
| | 89 | for (int j = start_y; j < end_y; j += step_h) { |
| | 90 | for (int k = start_x; k < end_x; k += step_w) { |
| | 91 | if (mask & 0x8000U) { |
| | 92 | for (int m = 0; m < step_h; m++) { |
| | 93 | for (int n = 0; n < step_w; n++) { |
| | 94 | if (j + m >= avctx->height || k + n >= avctx->width) |
| | 95 | continue; |
| | 96 | frame->data[0][frame->linesize[0] * (h - (j + m)) + 3 * (k + n) + 0] = color[0]; |
| | 97 | frame->data[0][frame->linesize[0] * (h - (j + m)) + 3 * (k + n) + 1] = color[1]; |
| | 98 | frame->data[0][frame->linesize[0] * (h - (j + m)) + 3 * (k + n) + 2] = color[2]; |
| | 99 | } |
| | 100 | } |
| | 101 | } |
| | 102 | mask = mask << 1; |
| | 103 | } |
| | 104 | } |
| | 105 | } |
| | 106 | } |
| | 107 | |
| | 108 | static int decode_frame(AVCodecContext *avctx, void *data, |
| | 109 | int *got_frame, AVPacket *avpkt) |
| | 110 | { |
| | 111 | ARBCContext *s = avctx->priv_data; |
| | 112 | AVFrame *frame = data; |
| | 113 | int ret, nb_segments, keyframe = 1; |
| | 114 | |
| | 115 | if (avpkt->size < 10) |
| | 116 | return AVERROR_INVALIDDATA; |
| | 117 | |
| | 118 | if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) |
| | 119 | return ret; |
| | 120 | |
| | 121 | if (s->prev_frame->data[0]) { |
| | 122 | ret = av_frame_copy(frame, s->prev_frame); |
| | 123 | if (ret < 0) |
| | 124 | return ret; |
| | 125 | } |
| | 126 | |
| | 127 | bytestream2_init(&s->gb, avpkt->data, avpkt->size); |
| | 128 | bytestream2_skip(&s->gb, 8); |
| | 129 | nb_segments = bytestream2_get_le16(&s->gb); |
| | 130 | if (nb_segments == 0) |
| | 131 | keyframe = 0; |
| | 132 | |
| | 133 | for (int i = 0; i < nb_segments; i++) { |
| | 134 | int resolution_flag; |
| | 135 | uint8_t fill[3]; |
| | 136 | |
| | 137 | if (bytestream2_get_bytes_left(&s->gb) <= 0) |
| | 138 | return AVERROR_INVALIDDATA; |
| | 139 | |
| | 140 | fill[0] = bytestream2_get_byte(&s->gb); |
| | 141 | bytestream2_skip(&s->gb, 1); |
| | 142 | fill[1] = bytestream2_get_byte(&s->gb); |
| | 143 | bytestream2_skip(&s->gb, 1); |
| | 144 | fill[2] = bytestream2_get_byte(&s->gb); |
| | 145 | bytestream2_skip(&s->gb, 1); |
| | 146 | resolution_flag = bytestream2_get_byte(&s->gb); |
| | 147 | |
| | 148 | if (resolution_flag & 0x10) |
| | 149 | fill_tileX(avctx, 1024, 1024, fill, frame); |
| | 150 | if (resolution_flag & 0x08) |
| | 151 | fill_tileX(avctx, 256, 256, fill, frame); |
| | 152 | if (resolution_flag & 0x04) |
| | 153 | fill_tileX(avctx, 64, 64, fill, frame); |
| | 154 | if (resolution_flag & 0x02) |
| | 155 | fill_tileX(avctx, 16, 16, fill, frame); |
| | 156 | if (resolution_flag & 0x01) |
| | 157 | fill_tile4(avctx, fill, frame); |
| | 158 | } |
| | 159 | |
| | 160 | av_frame_unref(s->prev_frame); |
| | 161 | if ((ret = av_frame_ref(s->prev_frame, frame)) < 0) |
| | 162 | return ret; |
| | 163 | |
| | 164 | frame->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; |
| | 165 | frame->key_frame = keyframe; |
| | 166 | *got_frame = 1; |
| | 167 | |
| | 168 | return avpkt->size; |
| | 169 | } |
| | 170 | |
| | 171 | static av_cold int decode_init(AVCodecContext *avctx) |
| | 172 | { |
| | 173 | ARBCContext *s = avctx->priv_data; |
| | 174 | |
| | 175 | avctx->pix_fmt = AV_PIX_FMT_RGB24; |
| | 176 | |
| | 177 | s->prev_frame = av_frame_alloc(); |
| | 178 | if (!s->prev_frame) |
| | 179 | return AVERROR(ENOMEM); |
| | 180 | |
| | 181 | return 0; |
| | 182 | } |
| | 183 | |
| | 184 | static av_cold int decode_close(AVCodecContext *avctx) |
| | 185 | { |
| | 186 | ARBCContext *s = avctx->priv_data; |
| | 187 | |
| | 188 | av_frame_free(&s->prev_frame); |
| | 189 | |
| | 190 | return 0; |
| | 191 | } |
| | 192 | |
| | 193 | AVCodec ff_arbc_decoder = { |
| | 194 | .name = "arbc", |
| | 195 | .long_name = NULL_IF_CONFIG_SMALL("Gryphon's Anim Compressor"), |
| | 196 | .type = AVMEDIA_TYPE_VIDEO, |
| | 197 | .id = AV_CODEC_ID_ARBC, |
| | 198 | .priv_data_size = sizeof(ARBCContext), |
| | 199 | .init = decode_init, |
| | 200 | .decode = decode_frame, |
| | 201 | .close = decode_close, |
| | 202 | .capabilities = AV_CODEC_CAP_DR1, |
| | 203 | .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, |
| | 204 | }; |