diff options
author | Paul B Mahol <onemda@gmail.com> | 2019-01-20 13:18:38 +0300 |
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committer | Paul B Mahol <onemda@gmail.com> | 2019-01-27 15:53:29 +0300 |
commit | 795af110f70bbd12b45ae2d3b08e7f45db5224a0 (patch) | |
tree | 708e289c4e0354632068113b214d81280d452de5 /libavcodec/arbc.c | |
parent | d8ebfd1bdf7e2c47af3eb057b97de5b7fe854e35 (diff) |
avcodec: add ARBC decoder
Thanks Kostya for great help in reversing binary.
Diffstat (limited to 'libavcodec/arbc.c')
-rw-r--r-- | libavcodec/arbc.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/libavcodec/arbc.c b/libavcodec/arbc.c new file mode 100644 index 0000000000..01a146f934 --- /dev/null +++ b/libavcodec/arbc.c @@ -0,0 +1,204 @@ +/* + * 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 void fill_tile4(AVCodecContext *avctx, uint8_t *color, AVFrame *frame) +{ + ARBCContext *s = avctx->priv_data; + GetByteContext *gb = &s->gb; + int nb_tiles = bytestream2_get_le16(gb); + int h = avctx->height - 1; + + 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; + } + frame->data[0][frame->linesize[0] * (h - j) + 3 * k + 0] = color[0]; + frame->data[0][frame->linesize[0] * (h - j) + 3 * k + 1] = color[1]; + frame->data[0][frame->linesize[0] * (h - j) + 3 * k + 2] = color[2]; + } + mask = mask << 1; + } + } + } +} + +static void fill_tileX(AVCodecContext *avctx, int tile_width, int tile_height, + uint8_t *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; + + 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; + + 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; + frame->data[0][frame->linesize[0] * (h - (j + m)) + 3 * (k + n) + 0] = color[0]; + frame->data[0][frame->linesize[0] * (h - (j + m)) + 3 * (k + n) + 1] = color[1]; + frame->data[0][frame->linesize[0] * (h - (j + m)) + 3 * (k + n) + 2] = color[2]; + } + } + } + mask = mask << 1; + } + } + } +} + +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, keyframe = 1; + + if (avpkt->size < 10) + 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; + } + + bytestream2_init(&s->gb, avpkt->data, avpkt->size); + bytestream2_skip(&s->gb, 8); + nb_segments = bytestream2_get_le16(&s->gb); + if (nb_segments == 0) + keyframe = 0; + + for (int i = 0; i < nb_segments; i++) { + int resolution_flag; + uint8_t fill[3]; + + if (bytestream2_get_bytes_left(&s->gb) <= 0) + return AVERROR_INVALIDDATA; + + fill[0] = bytestream2_get_byte(&s->gb); + bytestream2_skip(&s->gb, 1); + fill[1] = bytestream2_get_byte(&s->gb); + bytestream2_skip(&s->gb, 1); + fill[2] = bytestream2_get_byte(&s->gb); + bytestream2_skip(&s->gb, 1); + resolution_flag = bytestream2_get_byte(&s->gb); + + if (resolution_flag & 0x10) + fill_tileX(avctx, 1024, 1024, fill, frame); + if (resolution_flag & 0x08) + fill_tileX(avctx, 256, 256, fill, frame); + if (resolution_flag & 0x04) + fill_tileX(avctx, 64, 64, fill, frame); + if (resolution_flag & 0x02) + fill_tileX(avctx, 16, 16, fill, frame); + if (resolution_flag & 0x01) + 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 = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; + frame->key_frame = keyframe; + *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 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, + .close = decode_close, + .capabilities = AV_CODEC_CAP_DR1, + .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, +}; |