/* * Gryphon's Anim Compressor decoder * Copyright (c) 2019 Paul B Mahol * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include "libavutil/imgutils.h" #include "libavutil/internal.h" #include "libavutil/intreadwrite.h" #include "avcodec.h" #include "bytestream.h" #include "codec_internal.h" #include "internal.h" typedef struct ARBCContext { GetByteContext gb; AVFrame *prev_frame; } ARBCContext; static int fill_tile4(AVCodecContext *avctx, int color, AVFrame *frame) { ARBCContext *s = avctx->priv_data; GetByteContext *gb = &s->gb; int nb_tiles = bytestream2_get_le16(gb); int h = avctx->height - 1; int pixels_overwritten = 0; if ((avctx->width / 4 + 1) * (avctx->height / 4 + 1) < nb_tiles) return 0; for (int i = 0; i < nb_tiles; i++) { int y = bytestream2_get_byte(gb); int x = bytestream2_get_byte(gb); uint16_t mask = bytestream2_get_le16(gb); int start_y = y * 4, start_x = x * 4; int end_y = start_y + 4, end_x = start_x + 4; for (int j = start_y; j < end_y; j++) { for (int k = start_x; k < end_x; k++) { if (mask & 0x8000) { if (j >= avctx->height || k >= avctx->width) { mask = mask << 1; continue; } AV_WB24(&frame->data[0][frame->linesize[0] * (h - j) + 3 * k], color); pixels_overwritten ++; } mask = mask << 1; } } } return pixels_overwritten; } static int fill_tileX(AVCodecContext *avctx, int tile_width, int tile_height, int color, AVFrame *frame) { ARBCContext *s = avctx->priv_data; GetByteContext *gb = &s->gb; const int step_h = tile_height / 4; const int step_w = tile_width / 4; int nb_tiles = bytestream2_get_le16(gb); int h = avctx->height - 1; int pixels_overwritten = 0; if ((avctx->width / tile_width + 1) * (avctx->height / tile_height + 1) < nb_tiles) return 0; for (int i = 0; i < nb_tiles; i++) { int y = bytestream2_get_byte(gb); int x = bytestream2_get_byte(gb); uint16_t mask = bytestream2_get_le16(gb); int start_y = y * tile_height, start_x = x * tile_width; int end_y = start_y + tile_height, end_x = start_x + tile_width; if (start_x >= avctx->width || start_y >= avctx->height) continue; for (int j = start_y; j < end_y; j += step_h) { for (int k = start_x; k < end_x; k += step_w) { if (mask & 0x8000U) { for (int m = 0; m < step_h; m++) { for (int n = 0; n < step_w; n++) { if (j + m >= avctx->height || k + n >= avctx->width) continue; AV_WB24(&frame->data[0][frame->linesize[0] * (h - (j + m)) + 3 * (k + n)], color); } } pixels_overwritten += FFMIN(step_h, avctx->height - j) * FFMIN(step_w, avctx->width - k); } mask = mask << 1; } } } return pixels_overwritten; } static int decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt) { ARBCContext *s = avctx->priv_data; int ret, nb_segments; int prev_pixels = avctx->width * avctx->height; if (avpkt->size < 10) return AVERROR_INVALIDDATA; bytestream2_init(&s->gb, avpkt->data, avpkt->size); bytestream2_skip(&s->gb, 8); nb_segments = bytestream2_get_le16(&s->gb); if (nb_segments == 0) return avpkt->size; if (7 * nb_segments > bytestream2_get_bytes_left(&s->gb)) return AVERROR_INVALIDDATA; if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) return ret; if (s->prev_frame->data[0]) { ret = av_frame_copy(frame, s->prev_frame); if (ret < 0) return ret; } for (int i = 0; i < nb_segments; i++) { int resolution_flag; int fill; if (bytestream2_get_bytes_left(&s->gb) <= 0) return AVERROR_INVALIDDATA; fill = bytestream2_get_byte(&s->gb) << 16; bytestream2_skip(&s->gb, 1); fill |= bytestream2_get_byte(&s->gb) << 8; bytestream2_skip(&s->gb, 1); fill |= bytestream2_get_byte(&s->gb) << 0; bytestream2_skip(&s->gb, 1); resolution_flag = bytestream2_get_byte(&s->gb); if (resolution_flag & 0x10) prev_pixels -= fill_tileX(avctx, 1024, 1024, fill, frame); if (resolution_flag & 0x08) prev_pixels -= fill_tileX(avctx, 256, 256, fill, frame); if (resolution_flag & 0x04) prev_pixels -= fill_tileX(avctx, 64, 64, fill, frame); if (resolution_flag & 0x02) prev_pixels -= fill_tileX(avctx, 16, 16, fill, frame); if (resolution_flag & 0x01) prev_pixels -= fill_tile4(avctx, fill, frame); } av_frame_unref(s->prev_frame); if ((ret = av_frame_ref(s->prev_frame, frame)) < 0) return ret; frame->pict_type = prev_pixels <= 0 ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; frame->key_frame = prev_pixels <= 0; *got_frame = 1; return avpkt->size; } static av_cold int decode_init(AVCodecContext *avctx) { ARBCContext *s = avctx->priv_data; avctx->pix_fmt = AV_PIX_FMT_RGB24; s->prev_frame = av_frame_alloc(); if (!s->prev_frame) return AVERROR(ENOMEM); return 0; } static void decode_flush(AVCodecContext *avctx) { ARBCContext *s = avctx->priv_data; av_frame_unref(s->prev_frame); } static av_cold int decode_close(AVCodecContext *avctx) { ARBCContext *s = avctx->priv_data; av_frame_free(&s->prev_frame); return 0; } const FFCodec ff_arbc_decoder = { .p.name = "arbc", .p.long_name = NULL_IF_CONFIG_SMALL("Gryphon's Anim Compressor"), .p.type = AVMEDIA_TYPE_VIDEO, .p.id = AV_CODEC_ID_ARBC, .priv_data_size = sizeof(ARBCContext), .init = decode_init, FF_CODEC_DECODE_CB(decode_frame), .flush = decode_flush, .close = decode_close, .p.capabilities = AV_CODEC_CAP_DR1, .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP, };