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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 | +}; |