mirror of https://github.com/FFmpeg/FFmpeg.git
Paul B Mahol
6 years ago
parent
d8ebfd1bdf
commit
795af110f7
8 changed files with 217 additions and 1 deletions
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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 void fill_tile4(AVCodecContext *avctx, uint8_t *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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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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frame->data[0][frame->linesize[0] * (h - j) + 3 * k + 0] = color[0]; |
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frame->data[0][frame->linesize[0] * (h - j) + 3 * k + 1] = color[1]; |
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frame->data[0][frame->linesize[0] * (h - j) + 3 * k + 2] = color[2]; |
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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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} |
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static void fill_tileX(AVCodecContext *avctx, int tile_width, int tile_height, |
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uint8_t *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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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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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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frame->data[0][frame->linesize[0] * (h - (j + m)) + 3 * (k + n) + 0] = color[0]; |
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frame->data[0][frame->linesize[0] * (h - (j + m)) + 3 * (k + n) + 1] = color[1]; |
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frame->data[0][frame->linesize[0] * (h - (j + m)) + 3 * (k + n) + 2] = color[2]; |
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} |
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} |
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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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} |
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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, keyframe = 1; |
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if (avpkt->size < 10) |
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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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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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keyframe = 0; |
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for (int i = 0; i < nb_segments; i++) { |
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int resolution_flag; |
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uint8_t fill[3]; |
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if (bytestream2_get_bytes_left(&s->gb) <= 0) |
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return AVERROR_INVALIDDATA; |
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fill[0] = bytestream2_get_byte(&s->gb); |
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bytestream2_skip(&s->gb, 1); |
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fill[1] = bytestream2_get_byte(&s->gb); |
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bytestream2_skip(&s->gb, 1); |
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fill[2] = bytestream2_get_byte(&s->gb); |
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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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fill_tileX(avctx, 1024, 1024, fill, frame); |
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if (resolution_flag & 0x08) |
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fill_tileX(avctx, 256, 256, fill, frame); |
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if (resolution_flag & 0x04) |
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fill_tileX(avctx, 64, 64, fill, frame); |
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if (resolution_flag & 0x02) |
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fill_tileX(avctx, 16, 16, fill, frame); |
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if (resolution_flag & 0x01) |
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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 = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; |
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frame->key_frame = keyframe; |
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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 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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.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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