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https://github.com/FFmpeg/FFmpeg.git
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avcodec: add ARBC decoder
Thanks Kostya for great help in reversing binary.
This commit is contained in:
Paul B Mahol
parent
d8ebfd1bdf
commit
795af110f7
@ -16,6 +16,7 @@ version <next>:
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- anlmdn filter
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- maskfun filter
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- hcom demuxer and decoder
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- ARBC decoder
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version 4.1:
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@ -198,6 +198,7 @@ OBJS-$(CONFIG_APTX_HD_DECODER) += aptx.o
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OBJS-$(CONFIG_APTX_HD_ENCODER) += aptx.o
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OBJS-$(CONFIG_APNG_DECODER) += png.o pngdec.o pngdsp.o
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OBJS-$(CONFIG_APNG_ENCODER) += png.o pngenc.o
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OBJS-$(CONFIG_ARBC_DECODER) += arbc.o
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OBJS-$(CONFIG_SSA_DECODER) += assdec.o ass.o
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OBJS-$(CONFIG_SSA_ENCODER) += assenc.o ass.o
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OBJS-$(CONFIG_ASS_DECODER) += assdec.o ass.o
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@ -41,6 +41,7 @@ extern AVCodec ff_anm_decoder;
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extern AVCodec ff_ansi_decoder;
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extern AVCodec ff_apng_encoder;
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extern AVCodec ff_apng_decoder;
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extern AVCodec ff_arbc_decoder;
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extern AVCodec ff_asv1_encoder;
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extern AVCodec ff_asv1_decoder;
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extern AVCodec ff_asv2_encoder;
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204
libavcodec/arbc.c
Normal file
204
libavcodec/arbc.c
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@ -0,0 +1,204 @@
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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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@ -453,6 +453,7 @@ enum AVCodecID {
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AV_CODEC_ID_WCMV,
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AV_CODEC_ID_RASC,
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AV_CODEC_ID_HYMT,
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AV_CODEC_ID_ARBC,
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/* various PCM "codecs" */
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AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
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@ -1698,6 +1698,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
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.long_name = NULL_IF_CONFIG_SMALL("HuffYUV MT"),
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.props = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSLESS,
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},
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{
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.id = AV_CODEC_ID_ARBC,
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.type = AVMEDIA_TYPE_VIDEO,
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.name = "arbc",
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.long_name = NULL_IF_CONFIG_SMALL("Gryphon's Anim Compressor"),
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.props = AV_CODEC_PROP_LOSSY,
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},
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/* various PCM "codecs" */
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{
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@ -28,7 +28,7 @@
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#include "libavutil/version.h"
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#define LIBAVCODEC_VERSION_MAJOR 58
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#define LIBAVCODEC_VERSION_MINOR 44
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#define LIBAVCODEC_VERSION_MINOR 45
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#define LIBAVCODEC_VERSION_MICRO 100
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#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
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@ -476,6 +476,7 @@ const AVCodecTag ff_codec_bmp_tags[] = {
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{ AV_CODEC_ID_WCMV, MKTAG('W', 'C', 'M', 'V') },
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{ AV_CODEC_ID_RASC, MKTAG('R', 'A', 'S', 'C') },
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{ AV_CODEC_ID_HYMT, MKTAG('H', 'Y', 'M', 'T') },
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{ AV_CODEC_ID_ARBC, MKTAG('A', 'R', 'B', 'C') },
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{ AV_CODEC_ID_NONE, 0 }
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};
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