| /* |
| * 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 "libavutil/mem.h" |
| |
| #include "avcodec.h" |
| #include "bytestream.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, void *data, |
| int *got_frame, AVPacket *avpkt) |
| { |
| ARBCContext *s = avctx->priv_data; |
| AVFrame *frame = 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; |
| } |
| |
| AVCodec ff_arbc_decoder = { |
| .name = "arbc", |
| .long_name = NULL_IF_CONFIG_SMALL("Gryphon's Anim Compressor"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_ARBC, |
| .priv_data_size = sizeof(ARBCContext), |
| .init = decode_init, |
| .decode = decode_frame, |
| .flush = decode_flush, |
| .close = decode_close, |
| .capabilities = AV_CODEC_CAP_DR1, |
| .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, |
| }; |