2 * Gryphon's Anim Compressor decoder
3 * Copyright (c) 2019 Paul B Mahol
5 * This file is part of FFmpeg.
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.
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.
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
26 #include "libavutil/imgutils.h"
27 #include "libavutil/internal.h"
28 #include "libavutil/intreadwrite.h"
29 #include "libavutil/mem.h"
32 #include "bytestream.h"
35 typedef struct ARBCContext {
41 static void fill_tile4(AVCodecContext *avctx, uint8_t *color, AVFrame *frame)
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;
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;
55 for (int j = start_y; j < end_y; j++) {
56 for (int k = start_x; k < end_x; k++) {
58 if (j >= avctx->height || k >= avctx->width) {
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];
72 static void fill_tileX(AVCodecContext *avctx, int tile_width, int tile_height,
73 uint8_t *color, AVFrame *frame)
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;
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;
89 for (int j = start_y; j < end_y; j += step_h) {
90 for (int k = start_x; k < end_x; k += step_w) {
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)
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];
108 static int decode_frame(AVCodecContext *avctx, void *data,
109 int *got_frame, AVPacket *avpkt)
111 ARBCContext *s = avctx->priv_data;
112 AVFrame *frame = data;
113 int ret, nb_segments, keyframe = 1;
115 if (avpkt->size < 10)
116 return AVERROR_INVALIDDATA;
118 if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
121 if (s->prev_frame->data[0]) {
122 ret = av_frame_copy(frame, s->prev_frame);
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)
133 for (int i = 0; i < nb_segments; i++) {
137 if (bytestream2_get_bytes_left(&s->gb) <= 0)
138 return AVERROR_INVALIDDATA;
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);
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);
160 av_frame_unref(s->prev_frame);
161 if ((ret = av_frame_ref(s->prev_frame, frame)) < 0)
164 frame->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
165 frame->key_frame = keyframe;
171 static av_cold int decode_init(AVCodecContext *avctx)
173 ARBCContext *s = avctx->priv_data;
175 avctx->pix_fmt = AV_PIX_FMT_RGB24;
177 s->prev_frame = av_frame_alloc();
179 return AVERROR(ENOMEM);
184 static av_cold int decode_close(AVCodecContext *avctx)
186 ARBCContext *s = avctx->priv_data;
188 av_frame_free(&s->prev_frame);
193 AVCodec ff_arbc_decoder = {
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),
200 .decode = decode_frame,
201 .close = decode_close,
202 .capabilities = AV_CODEC_CAP_DR1,
203 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,