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, 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;
48 if ((avctx->width / 4 + 1) * (avctx->height / 4 + 1) < nb_tiles)
51 for (int i = 0; i < nb_tiles; i++) {
52 int y = bytestream2_get_byte(gb);
53 int x = bytestream2_get_byte(gb);
54 uint16_t mask = bytestream2_get_le16(gb);
55 int start_y = y * 4, start_x = x * 4;
56 int end_y = start_y + 4, end_x = start_x + 4;
58 for (int j = start_y; j < end_y; j++) {
59 for (int k = start_x; k < end_x; k++) {
61 if (j >= avctx->height || k >= avctx->width) {
65 AV_WB24(&frame->data[0][frame->linesize[0] * (h - j) + 3 * k], color);
73 static void fill_tileX(AVCodecContext *avctx, int tile_width, int tile_height,
74 int color, AVFrame *frame)
76 ARBCContext *s = avctx->priv_data;
77 GetByteContext *gb = &s->gb;
78 const int step_h = tile_height / 4;
79 const int step_w = tile_width / 4;
80 int nb_tiles = bytestream2_get_le16(gb);
81 int h = avctx->height - 1;
83 if ((avctx->width / tile_width + 1) * (avctx->height / tile_height + 1) < nb_tiles)
86 for (int i = 0; i < nb_tiles; i++) {
87 int y = bytestream2_get_byte(gb);
88 int x = bytestream2_get_byte(gb);
89 uint16_t mask = bytestream2_get_le16(gb);
90 int start_y = y * tile_height, start_x = x * tile_width;
91 int end_y = start_y + tile_height, end_x = start_x + tile_width;
93 for (int j = start_y; j < end_y; j += step_h) {
94 for (int k = start_x; k < end_x; k += step_w) {
96 for (int m = 0; m < step_h; m++) {
97 for (int n = 0; n < step_w; n++) {
98 if (j + m >= avctx->height || k + n >= avctx->width)
100 AV_WB24(&frame->data[0][frame->linesize[0] * (h - (j + m)) + 3 * (k + n)], color);
110 static int decode_frame(AVCodecContext *avctx, void *data,
111 int *got_frame, AVPacket *avpkt)
113 ARBCContext *s = avctx->priv_data;
114 AVFrame *frame = data;
115 int ret, nb_segments, keyframe = 1;
117 if (avpkt->size < 10)
118 return AVERROR_INVALIDDATA;
120 if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
123 if (s->prev_frame->data[0]) {
124 ret = av_frame_copy(frame, s->prev_frame);
129 bytestream2_init(&s->gb, avpkt->data, avpkt->size);
130 bytestream2_skip(&s->gb, 8);
131 nb_segments = bytestream2_get_le16(&s->gb);
132 if (nb_segments == 0)
135 for (int i = 0; i < nb_segments; i++) {
139 if (bytestream2_get_bytes_left(&s->gb) <= 0)
140 return AVERROR_INVALIDDATA;
142 fill = bytestream2_get_byte(&s->gb) << 16;
143 bytestream2_skip(&s->gb, 1);
144 fill |= bytestream2_get_byte(&s->gb) << 8;
145 bytestream2_skip(&s->gb, 1);
146 fill |= bytestream2_get_byte(&s->gb) << 0;
147 bytestream2_skip(&s->gb, 1);
148 resolution_flag = bytestream2_get_byte(&s->gb);
150 if (resolution_flag & 0x10)
151 fill_tileX(avctx, 1024, 1024, fill, frame);
152 if (resolution_flag & 0x08)
153 fill_tileX(avctx, 256, 256, fill, frame);
154 if (resolution_flag & 0x04)
155 fill_tileX(avctx, 64, 64, fill, frame);
156 if (resolution_flag & 0x02)
157 fill_tileX(avctx, 16, 16, fill, frame);
158 if (resolution_flag & 0x01)
159 fill_tile4(avctx, fill, frame);
162 av_frame_unref(s->prev_frame);
163 if ((ret = av_frame_ref(s->prev_frame, frame)) < 0)
166 frame->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
167 frame->key_frame = keyframe;
173 static av_cold int decode_init(AVCodecContext *avctx)
175 ARBCContext *s = avctx->priv_data;
177 avctx->pix_fmt = AV_PIX_FMT_RGB24;
179 s->prev_frame = av_frame_alloc();
181 return AVERROR(ENOMEM);
186 static void decode_flush(AVCodecContext *avctx)
188 ARBCContext *s = avctx->priv_data;
190 av_frame_unref(s->prev_frame);
193 static av_cold int decode_close(AVCodecContext *avctx)
195 ARBCContext *s = avctx->priv_data;
197 av_frame_free(&s->prev_frame);
202 AVCodec ff_arbc_decoder = {
204 .long_name = NULL_IF_CONFIG_SMALL("Gryphon's Anim Compressor"),
205 .type = AVMEDIA_TYPE_VIDEO,
206 .id = AV_CODEC_ID_ARBC,
207 .priv_data_size = sizeof(ARBCContext),
209 .decode = decode_frame,
210 .flush = decode_flush,
211 .close = decode_close,
212 .capabilities = AV_CODEC_CAP_DR1,
213 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,