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