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 int fill_tile4(AVCodecContext *avctx, int 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;
47 int pixels_overwritten = 0;
49 if ((avctx->width / 4 + 1) * (avctx->height / 4 + 1) < nb_tiles)
52 for (int i = 0; i < nb_tiles; i++) {
53 int y = bytestream2_get_byte(gb);
54 int x = bytestream2_get_byte(gb);
55 uint16_t mask = bytestream2_get_le16(gb);
56 int start_y = y * 4, start_x = x * 4;
57 int end_y = start_y + 4, end_x = start_x + 4;
59 for (int j = start_y; j < end_y; j++) {
60 for (int k = start_x; k < end_x; k++) {
62 if (j >= avctx->height || k >= avctx->width) {
66 AV_WB24(&frame->data[0][frame->linesize[0] * (h - j) + 3 * k], color);
67 pixels_overwritten ++;
73 return pixels_overwritten;
76 static int fill_tileX(AVCodecContext *avctx, int tile_width, int tile_height,
77 int color, AVFrame *frame)
79 ARBCContext *s = avctx->priv_data;
80 GetByteContext *gb = &s->gb;
81 const int step_h = tile_height / 4;
82 const int step_w = tile_width / 4;
83 int nb_tiles = bytestream2_get_le16(gb);
84 int h = avctx->height - 1;
85 int pixels_overwritten = 0;
87 if ((avctx->width / tile_width + 1) * (avctx->height / tile_height + 1) < nb_tiles)
90 for (int i = 0; i < nb_tiles; i++) {
91 int y = bytestream2_get_byte(gb);
92 int x = bytestream2_get_byte(gb);
93 uint16_t mask = bytestream2_get_le16(gb);
94 int start_y = y * tile_height, start_x = x * tile_width;
95 int end_y = start_y + tile_height, end_x = start_x + tile_width;
97 if (start_x >= avctx->width || start_y >= avctx->height)
100 for (int j = start_y; j < end_y; j += step_h) {
101 for (int k = start_x; k < end_x; k += step_w) {
102 if (mask & 0x8000U) {
103 for (int m = 0; m < step_h; m++) {
104 for (int n = 0; n < step_w; n++) {
105 if (j + m >= avctx->height || k + n >= avctx->width)
107 AV_WB24(&frame->data[0][frame->linesize[0] * (h - (j + m)) + 3 * (k + n)], color);
110 pixels_overwritten += FFMIN(step_h, avctx->height - j) * FFMIN(step_w, avctx->width - k);
116 return pixels_overwritten;
119 static int decode_frame(AVCodecContext *avctx, void *data,
120 int *got_frame, AVPacket *avpkt)
122 ARBCContext *s = avctx->priv_data;
123 AVFrame *frame = data;
124 int ret, nb_segments;
125 int prev_pixels = avctx->width * avctx->height;
127 if (avpkt->size < 10)
128 return AVERROR_INVALIDDATA;
130 bytestream2_init(&s->gb, avpkt->data, avpkt->size);
131 bytestream2_skip(&s->gb, 8);
132 nb_segments = bytestream2_get_le16(&s->gb);
133 if (nb_segments == 0)
136 if (7 * nb_segments > bytestream2_get_bytes_left(&s->gb))
137 return AVERROR_INVALIDDATA;
139 if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
142 if (s->prev_frame->data[0]) {
143 ret = av_frame_copy(frame, s->prev_frame);
148 for (int i = 0; i < nb_segments; i++) {
152 if (bytestream2_get_bytes_left(&s->gb) <= 0)
153 return AVERROR_INVALIDDATA;
155 fill = bytestream2_get_byte(&s->gb) << 16;
156 bytestream2_skip(&s->gb, 1);
157 fill |= bytestream2_get_byte(&s->gb) << 8;
158 bytestream2_skip(&s->gb, 1);
159 fill |= bytestream2_get_byte(&s->gb) << 0;
160 bytestream2_skip(&s->gb, 1);
161 resolution_flag = bytestream2_get_byte(&s->gb);
163 if (resolution_flag & 0x10)
164 prev_pixels -= fill_tileX(avctx, 1024, 1024, fill, frame);
165 if (resolution_flag & 0x08)
166 prev_pixels -= fill_tileX(avctx, 256, 256, fill, frame);
167 if (resolution_flag & 0x04)
168 prev_pixels -= fill_tileX(avctx, 64, 64, fill, frame);
169 if (resolution_flag & 0x02)
170 prev_pixels -= fill_tileX(avctx, 16, 16, fill, frame);
171 if (resolution_flag & 0x01)
172 prev_pixels -= fill_tile4(avctx, fill, frame);
175 av_frame_unref(s->prev_frame);
176 if ((ret = av_frame_ref(s->prev_frame, frame)) < 0)
179 frame->pict_type = prev_pixels <= 0 ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
180 frame->key_frame = prev_pixels <= 0;
186 static av_cold int decode_init(AVCodecContext *avctx)
188 ARBCContext *s = avctx->priv_data;
190 avctx->pix_fmt = AV_PIX_FMT_RGB24;
192 s->prev_frame = av_frame_alloc();
194 return AVERROR(ENOMEM);
199 static void decode_flush(AVCodecContext *avctx)
201 ARBCContext *s = avctx->priv_data;
203 av_frame_unref(s->prev_frame);
206 static av_cold int decode_close(AVCodecContext *avctx)
208 ARBCContext *s = avctx->priv_data;
210 av_frame_free(&s->prev_frame);
215 AVCodec ff_arbc_decoder = {
217 .long_name = NULL_IF_CONFIG_SMALL("Gryphon's Anim Compressor"),
218 .type = AVMEDIA_TYPE_VIDEO,
219 .id = AV_CODEC_ID_ARBC,
220 .priv_data_size = sizeof(ARBCContext),
222 .decode = decode_frame,
223 .flush = decode_flush,
224 .close = decode_close,
225 .capabilities = AV_CODEC_CAP_DR1,
226 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,